/* ════════════════════════════════════════════════════════════
   GMAT Math Trainer — Duolingo-inspired design system
   Light theme by default. Dark theme is opt-in.
   ════════════════════════════════════════════════════════════ */

/* Ensure [hidden] works even when .btn sets display:inline-flex */
[hidden] { display: none !important; }

:root {
  /* ─── Duolingo palette (light = default) ─── */
  --duo-green:        #58CC02;
  --duo-green-light:  #89E219;
  --duo-green-dark:   #58A700;
  --duo-green-bg:     #D7FFB8;
  --duo-green-grad:   linear-gradient(180deg, #78E000 0%, #58CC02 100%);

  --duo-red:          #FF4B4B;
  --duo-red-dark:     #D33131;
  --duo-red-bg:       #FFE0E0;

  --duo-blue:         #1CB0F6;
  --duo-blue-dark:    #0E8BBF;
  --duo-blue-bg:      #DDF4FF;

  --duo-yellow:       #FFC800;
  --duo-yellow-dark:  #E6A800;
  --duo-yellow-bg:    #FFF6CC;

  --duo-orange:       #FF9600;
  --duo-orange-dark:  #CC7A00;
  --duo-orange-bg:    #FFE9CC;

  --duo-purple:       #CE82FF;
  --duo-purple-dark:  #8549BA;
  --duo-purple-bg:    #F4E5FF;

  --text-primary:     #4B4B4B;
  --text-secondary:   #6F6F6F;
  --text-muted:       #AFAFAF;
  --text-on-color:    #FFFFFF;

  --border:           #E5E5E5;
  --border-strong:    #CFCFCF;

  --surface:          #FFFFFF;
  --surface-soft:     #F7F7F7;
  --bg:               #FAFAFA;

  /* Backwards-compat aliases used by app.js / dynamic classes */
  --fg:               var(--text-primary);
  --fg-muted:         var(--text-secondary);
  --fg-faint:         var(--text-muted);
  --bg-card:          var(--surface);
  --bg-elevated:      var(--surface);
  --bg-input:         var(--surface-soft);

  --primary:          var(--duo-green);
  --primary-hover:    var(--duo-green-light);
  --primary-fg:       var(--text-on-color);
  --success:          var(--duo-green);
  --success-bg:       var(--duo-green-bg);
  --success-bd:       var(--duo-green);
  --danger:           var(--duo-red);
  --danger-bg:        var(--duo-red-bg);
  --danger-bd:        var(--duo-red);
  --warning:          var(--duo-orange);
  --warning-bg:       var(--duo-orange-bg);
  --warning-bd:       var(--duo-orange);

  --shadow-sm:        0 1px 2px rgba(75, 75, 75, 0.06);
  --shadow:           0 4px 16px rgba(75, 75, 75, 0.08);
  --shadow-lg:        0 12px 40px rgba(75, 75, 75, 0.18);

  --radius-sm:        8px;
  --radius:           12px;
  --radius-lg:        16px;
  --radius-xl:        20px;

  --easing:           cubic-bezier(.2,.8,.25,1);
  --press-easing:     cubic-bezier(.4, 0, .2, 1);
}

/* Dark theme (opt-in) — keeps the Duolingo accents but on a dark canvas */
[data-theme="dark"] {
  --text-primary:     #F5F5F5;
  --text-secondary:   #C7CDD9;
  --text-muted:       #8A93A6;
  --text-on-color:    #FFFFFF;

  --border:           #2A3142;
  --border-strong:    #3A4458;

  --surface:          #1A2034;
  --surface-soft:     #131826;
  --bg:               #0E1220;

  --duo-green-bg:     rgba(88, 204, 2, 0.14);
  --duo-red-bg:       rgba(255, 75, 75, 0.14);
  --duo-blue-bg:      rgba(28, 176, 246, 0.14);
  --duo-yellow-bg:    rgba(255, 200, 0, 0.16);
  --duo-orange-bg:    rgba(255, 150, 0, 0.16);
  --duo-purple-bg:    rgba(206, 130, 255, 0.16);

  --shadow-sm:        0 1px 2px rgba(0,0,0,0.3);
  --shadow:           0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg:        0 12px 40px rgba(0,0,0,0.5);
}

/* ─── Base ─── */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; padding: 0; }
body {
  font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.55;
  color: var(--text-primary);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
}

button { font-family: inherit; cursor: pointer; }

kbd {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 2px 6px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  color: var(--text-secondary);
}

/* ─── Header ─── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  color: var(--duo-green);
  display: flex;
  filter: drop-shadow(0 2px 0 var(--duo-green-dark));
}

.brand-title {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.brand-sub {
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
}

.header-stats {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  transition: transform 0.15s var(--easing);
}
.stat-pill:hover { transform: translateY(-1px); }

.stat-pill:nth-child(1) { /* Accuracy */
  background: var(--duo-green-bg);
  border-color: var(--duo-green);
  color: var(--duo-green-dark);
}
.stat-pill:nth-child(2) { /* Today */
  background: var(--duo-blue-bg);
  border-color: var(--duo-blue);
  color: var(--duo-blue-dark);
}
.stat-pill:nth-child(3) { /* Streak */
  background: var(--duo-orange-bg);
  border-color: var(--duo-orange);
  color: var(--duo-orange-dark);
}
.stat-pill:nth-child(3) .stat-pill-icon {
  animation: glowPulse 1.8s ease-in-out infinite;
}

.stat-pill-icon { font-size: 14px; line-height: 1; }
.stat-pill-value { font-weight: 800; font-variant-numeric: tabular-nums; font-size: 14px; }
.stat-pill-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  opacity: 0.85;
}

.theme-toggle {
  background: var(--surface-soft);
  border: 2px solid var(--border);
  color: var(--text-secondary);
  width: 38px; height: 38px;
  border-radius: 50%;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s var(--easing);
  box-shadow: 0 2px 0 var(--border);
}
.theme-toggle:hover { border-color: var(--duo-blue); color: var(--duo-blue); }
.theme-toggle:active { transform: translateY(2px); box-shadow: none; }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: none; }

/* ─── Tabs ─── */
.tab-bar {
  display: flex;
  gap: 4px;
  padding: 0 28px;
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 75px;
  z-index: 99;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s var(--easing);
}

.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  color: var(--duo-green);
  border-bottom-color: var(--duo-green);
}

/* ─── Main / Panels ─── */
.app-main {
  flex: 1;
  padding: 28px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.22s var(--easing); }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Practice two-column layout ─── */
.practice-layout {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.practice-sidebar {
  flex-shrink: 0;
  width: 200px;
  position: sticky;
  top: 16px;
}

.practice-main {
  flex: 1;
  min-width: 0;
}

/* ── Daily Tip Card ─────────────────────────── */
.daily-tip-card {
  background: linear-gradient(135deg, rgba(99,102,241,.08), rgba(139,92,246,.08));
  border: 1px solid rgba(99,102,241,.25);
  border-radius: 12px;
  padding: 12px;
  margin-top: 14px;
  position: relative;
}
.daily-tip-header {
  font-size: 11px;
  font-weight: 800;
  color: #6366f1;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.daily-tip-text {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-primary);
}
.daily-tip-next {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  color: #6366f1;
  padding: 2px 6px;
  border-radius: 6px;
  transition: background .15s;
}
.daily-tip-next:hover { background: rgba(99,102,241,.15); }

/* Sidebar view-toggle (compact) */
.practice-sidebar .view-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
}
.practice-sidebar .view-toggle-btn {
  flex: 1;
  font-size: 12px;
  padding: 7px 8px;
}

/* Sidebar filter column */
.filter-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.filter-group.inline { flex-direction: row; align-items: center; gap: 8px; }

.filter-group label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 800;
}

.filter-group select {
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  padding: 9px 10px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 2px solid var(--border);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s var(--easing), box-shadow 0.15s var(--easing);
  cursor: pointer;
  width: 100%;
}

.filter-group select:hover { border-color: var(--border-strong); }
.filter-group select:focus { border-color: var(--duo-blue); box-shadow: 0 0 0 3px var(--duo-blue-bg); }

/* Legacy .filter-row no longer used but kept for compatibility */
.filter-row { display: none; }

/* ─── Question card ─── */
.question-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  position: relative;
}

.qcard-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border);
}

.spacer { flex: 1; }

.badge {
  display: inline-block;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: 2px solid var(--border);
  background: var(--surface-soft);
  color: var(--text-secondary);
}

.badge-type {
  color: var(--duo-blue-dark);
  border-color: var(--duo-blue);
  background: var(--duo-blue-bg);
}

.badge-topic {
  color: var(--duo-purple-dark);
  border-color: var(--duo-purple);
  background: var(--duo-purple-bg);
}

.badge-difficulty[data-level="easy"] {
  color: var(--duo-green-dark);
  border-color: var(--duo-green);
  background: var(--duo-green-bg);
}
.badge-difficulty[data-level="medium"] {
  color: var(--duo-orange-dark);
  border-color: var(--duo-orange);
  background: var(--duo-orange-bg);
}
.badge-difficulty[data-level="hard"] {
  color: var(--duo-red-dark);
  border-color: var(--duo-red);
  background: var(--duo-red-bg);
}

.badge-id {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  background: var(--surface-soft);
  border-color: var(--border);
}

.timer {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  color: var(--text-secondary);
  transition: all 0.18s var(--easing);
}

.timer.warn {
  color: var(--duo-orange-dark);
  border-color: var(--duo-orange);
  background: var(--duo-orange-bg);
}
.timer.over {
  color: var(--duo-red-dark);
  border-color: var(--duo-red);
  background: var(--duo-red-bg);
  animation: glowPulse 1.4s ease-in-out infinite;
}

.timer-value { font-weight: 800; }

.qcard-question {
  font-size: 20px;
  line-height: 1.5;
  margin-bottom: 22px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-weight: 700;
  color: var(--text-primary);
}

/* DS statement boxes (Duolingo-style separated info chunks) */
.ds-stem {
  font-size: 18px;
  line-height: 1.55;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  white-space: pre-wrap;
}
.ds-statement {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-left: 3px solid var(--duo-blue);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 8px 0;
  white-space: pre-wrap;
}
.ds-statement-2 { border-left-color: var(--duo-purple); }
.ds-statement-label {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--duo-blue-dark);
  margin-bottom: 6px;
}
.ds-statement-2 .ds-statement-label { color: var(--duo-purple-dark); }
.ds-statement-text {
  font-size: 16px;
  line-height: 1.55;
  font-weight: 600;
  color: var(--text-primary);
}

/* CR argument quote block */
.cr-argument {
  background: var(--surface-soft);
  border-left: 4px solid var(--duo-purple);
  padding: 14px 18px;
  border-radius: 8px;
  font-size: 17px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
  white-space: pre-wrap;
}
.cr-question {
  font-size: 18px;
  line-height: 1.55;
  font-weight: 800;
  color: var(--duo-purple-dark);
  white-space: pre-wrap;
}

/* RC question context header */
.rc-q-context {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--duo-blue-dark);
  background: var(--duo-blue-bg);
  border: 1px solid var(--duo-blue);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.qcard-choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 22px;
}

/* ─── Choice cards (AUTHENTIC Duolingo: border-2 + border-b-4) ─── */
.choice {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  min-height: 64px;
  border: 2px solid var(--border);
  border-bottom: 4px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s var(--easing),
              border-bottom-color 0.15s var(--easing),
              background 0.15s var(--easing),
              transform 0.1s var(--press-easing);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  user-select: none;
}

.choice:hover:not(.disabled) {
  border-color: var(--duo-blue);
  border-bottom-color: var(--duo-blue);
  background: var(--duo-blue-bg);
}

.choice:active:not(.disabled) {
  transform: translateY(2px);
  border-bottom-width: 2px;
}

.choice.selected {
  border-color: var(--duo-blue);
  border-bottom-color: var(--duo-blue-dark);
  background: var(--duo-blue-bg);
  color: var(--duo-blue-dark);
}

.choice-letter {
  font-weight: 800;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface-soft);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  border: 2px solid var(--border);
  transition: all 0.15s var(--easing);
}

.choice.selected .choice-letter {
  background: var(--duo-blue);
  color: white;
  border-color: var(--duo-blue);
}

.choice-text { flex: 1; line-height: 1.5; overflow-wrap: anywhere; min-width: 0; font-weight: 700; }

.choice.correct {
  border-color: var(--duo-green);
  border-bottom-color: var(--duo-green-dark);
  background: var(--duo-green-bg);
  color: var(--duo-green-dark);
}
.choice.correct .choice-letter {
  background: var(--duo-green);
  color: white;
  border-color: var(--duo-green);
}

.choice.wrong {
  border-color: var(--duo-red);
  border-bottom-color: var(--duo-red-dark);
  background: var(--duo-red-bg);
  color: var(--duo-red-dark);
}
.choice.wrong .choice-letter {
  background: var(--duo-red);
  color: white;
  border-color: var(--duo-red);
}

.choice.disabled { cursor: default; }
.choice.disabled:hover { transform: none; }

/* ─── Buttons (Duolingo 3D style) ─── */
.qcard-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* AUTHENTIC Duolingo button: border-bottom for 3D, NOT box-shadow.
   On :active the bottom-border collapses and the button translates down 4px. */
.btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 13px 22px;
  border-radius: var(--radius-lg);
  border: 0 solid transparent;
  border-bottom: 4px solid var(--border-strong);
  transition: transform 0.1s var(--press-easing),
              border-bottom-width 0.1s var(--press-easing),
              border-bottom-color 0.1s var(--press-easing),
              filter 0.15s var(--easing);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-on-color);
  position: relative;
  white-space: nowrap;
  cursor: pointer;
}

.btn:disabled {
  background: #E5E5E5 !important;
  color: var(--text-muted) !important;
  border-bottom-color: var(--border-strong) !important;
  cursor: not-allowed;
}

.btn:not(:disabled):active {
  transform: translateY(4px);
  border-bottom-width: 0;
  border-bottom-color: transparent;
}

.btn-primary {
  background: var(--duo-green-grad);
  color: white;
  border-bottom-color: var(--duo-green-dark);
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.06); }

.btn-secondary {
  background: var(--surface-soft);
  color: var(--text-secondary);
  border: 2px solid var(--border);
  border-bottom: 4px solid var(--border-strong);
}
.btn-secondary:hover:not(:disabled) {
  filter: brightness(0.97);
  color: var(--text-primary);
}

.btn-small {
  font-size: 12px;
  padding: 9px 14px;
  border-radius: var(--radius);
  letter-spacing: 0.6px;
  border-bottom-width: 3px;
}
.btn-small.btn-primary { border-bottom-color: var(--duo-green-dark); }

.btn-hint {
  background: linear-gradient(180deg, #FFD840 0%, #FFC800 100%);
  color: #4A3800;
  border-bottom-color: var(--duo-yellow-dark);
}
.btn-hint:hover:not(:disabled) { filter: brightness(1.05); }

.btn-theory {
  background: linear-gradient(180deg, #DC9CFF 0%, #CE82FF 100%);
  color: white;
  border-bottom-color: var(--duo-purple-dark);
}
.btn-theory:hover:not(:disabled) { filter: brightness(1.05); }

.btn-retry-same {
  background: var(--surface-soft);
  color: var(--text-secondary);
  border: 2px solid var(--border);
  border-bottom: 4px solid var(--border-strong);
}
.btn-retry-same:hover:not(:disabled) { filter: brightness(0.97); color: var(--text-primary); }

.btn-retry-harder {
  background: linear-gradient(180deg, #2BC0FF 0%, #1CB0F6 100%);
  color: white;
  border-bottom-color: var(--duo-blue-dark);
}
.btn-retry-harder:hover:not(:disabled) { filter: brightness(1.05); }

.btn-retry-easier {
  background: linear-gradient(180deg, #FFAA1A 0%, #FF9600 100%);
  color: white;
  border-bottom-color: var(--duo-orange-dark);
}
.btn-retry-easier:hover:not(:disabled) { filter: brightness(1.05); }

.btn-large {
  font-size: 16px;
  padding: 16px 28px;
  border-radius: var(--radius-lg);
}

/* ─── Theory meta button (purple icon button) ─── */
.btn-theory-meta {
  background: linear-gradient(180deg, #DC9CFF 0%, #CE82FF 100%);
  color: white;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  cursor: pointer;
  padding: 0;
  box-shadow: 0 3px 0 var(--duo-purple-dark);
  transition: transform 0.1s var(--press-easing), box-shadow 0.1s var(--press-easing), filter 0.15s var(--easing);
}
.btn-theory-meta:hover { filter: brightness(1.05); }
.btn-theory-meta:active { transform: translateY(3px); box-shadow: none; }

/* ─── Flag button (orange toggle) ─── */
.btn-flag {
  background: var(--surface);
  border: 2px solid var(--border);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s var(--easing);
  flex-shrink: 0;
  cursor: pointer;
  padding: 0;
  box-shadow: 0 3px 0 var(--border);
}
.btn-flag:hover {
  color: var(--duo-orange);
  border-color: var(--duo-orange);
  background: var(--duo-orange-bg);
  box-shadow: 0 3px 0 var(--duo-orange);
}
.btn-flag.flagged {
  color: white;
  border-color: var(--duo-orange);
  background: var(--duo-orange);
  box-shadow: 0 3px 0 var(--duo-orange-dark);
  animation: pop 0.4s var(--easing);
}
.btn-flag:active { transform: translateY(3px); box-shadow: none; }

/* ─── Hint panel ─── */
.hint-panel {
  margin-top: 14px;
  padding: 14px 18px;
  border-radius: var(--radius);
  background: var(--duo-yellow-bg);
  border: 2px solid var(--duo-yellow);
  gap: 12px;
  align-items: flex-start;
  animation: bounceIn 0.4s var(--easing);
  box-shadow: 0 3px 0 var(--duo-yellow-dark);
}
.hint-panel:not([hidden]) { display: flex; }

.hint-icon { font-size: 20px; flex-shrink: 0; margin-top: 2px; }
.hint-text { font-size: 14px; line-height: 1.6; color: #5c3a00; font-weight: 600; }
[data-theme="dark"] .hint-text { color: #fde68a; }
[data-theme="dark"] .hint-panel { background: rgba(245,158,11,.12); border-color: #92400e; box-shadow: 0 3px 0 #451a03; }

/* ─── Feedback panel ─── */
.qcard-feedback {
  margin-top: 22px;
  padding: 20px;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border);
  background: var(--surface-soft);
  animation: slideUpFb 0.3s var(--easing);
}

@keyframes slideUpFb {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.qcard-feedback.correct {
  border-color: var(--duo-green);
  background: var(--duo-green-bg);
}
.qcard-feedback.wrong {
  border-color: var(--duo-red);
  background: var(--duo-red-bg);
}
.qcard-feedback.skipped {
  border-color: var(--duo-orange);
  background: var(--duo-orange-bg);
}

.feedback-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.feedback-status {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  display: inline-block;
}

.qcard-feedback.correct .feedback-status {
  color: var(--duo-green-dark);
  animation: bounceIn 0.5s var(--easing);
}
.qcard-feedback.wrong .feedback-status { color: var(--duo-red-dark); }
.qcard-feedback.skipped .feedback-status { color: var(--duo-orange-dark); }

.feedback-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 700;
}

.feedback-correct {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  font-weight: 700;
  flex-wrap: wrap;
}

.feedback-label {
  font-weight: 800;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.06em;
  align-self: center;
}

.feedback-explanation {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-primary);
  white-space: pre-wrap;
  font-weight: 500;
  background: rgba(255,255,255,0.55);
  padding: 12px 14px;
  border-radius: var(--radius);
  margin-top: 8px;
}

[data-theme="dark"] .feedback-explanation { background: rgba(0,0,0,0.18); }

/* ── Theory snippet (wrong-answer insight) ────── */
.theory-snippet {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-secondary);
  background: rgba(99,102,241,.08);
  border-left: 3px solid #6366f1;
  padding: 8px 12px;
  border-radius: 0 8px 8px 0;
  margin-top: 8px;
}
.theory-snippet strong { color: #6366f1; }
.theory-snippet-icon { margin-right: 6px; }

/* ─── Feedback action buttons ─── */
.feedback-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 2px dashed rgba(75,75,75,0.15);
}

[data-theme="dark"] .feedback-actions { border-top-color: rgba(255,255,255,0.12); }

.feedback-actions .btn {
  font-size: 12px;
  padding: 10px 16px;
  letter-spacing: 0.6px;
  box-shadow: 0 3px 0 var(--border);
}
.feedback-actions .btn-theory { box-shadow: 0 3px 0 var(--duo-purple-dark); }
.feedback-actions .btn-retry-harder { box-shadow: 0 3px 0 var(--duo-blue-dark); }
.feedback-actions .btn-retry-easier { box-shadow: 0 3px 0 var(--duo-orange-dark); }

/* ─── Session tracker ─── */
.session-tracker {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 14px;
  box-shadow: var(--shadow-sm);
}

.session-stat {
  text-align: center;
  padding: 6px;
  border-right: 2px solid var(--border);
}
.session-stat:last-child { border-right: none; }

.session-stat-value {
  font-size: 26px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--text-primary);
}

.session-stat:nth-child(1) .session-stat-value { color: var(--duo-green); }
.session-stat:nth-child(2) .session-stat-value { color: var(--duo-red); }
.session-stat:nth-child(3) .session-stat-value { color: var(--duo-orange); }
.session-stat:nth-child(4) .session-stat-value { color: var(--duo-blue); }
.session-stat:nth-child(5) .session-stat-value { color: var(--duo-purple); }

.session-stat-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 4px;
  font-weight: 800;
}

/* ─── Dashboard ─── */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.dash-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform 0.18s var(--easing);
}
.dash-card:hover { transform: translateY(-2px); }

.dash-card.big { grid-column: span 1; }

.dash-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--duo-green);
}
.dash-card.big::before { background: var(--duo-green); }
.dash-card:nth-of-type(2)::before { background: var(--duo-blue); }
.dash-card:nth-of-type(3)::before { background: var(--duo-orange); }
.dash-card:nth-of-type(4)::before { background: var(--duo-purple); }

.dash-card-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 800;
  margin-bottom: 8px;
}

.dash-card-value {
  font-size: 36px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--duo-green);
}
.dash-card.big .dash-card-value { color: var(--duo-green); }
.dash-card:nth-of-type(2) .dash-card-value { color: var(--duo-blue); }
.dash-card:nth-of-type(3) .dash-card-value { color: var(--duo-orange); }
.dash-card:nth-of-type(4) .dash-card-value { color: var(--duo-purple); }

.dash-card-sub {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 6px;
  font-weight: 600;
}

.dash-section {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
}

.dash-section-title {
  margin: 0 0 16px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  font-weight: 800;
}

.dash-meta-row {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 600;
}
.dash-meta-row strong { color: var(--text-primary); font-size: 18px; font-weight: 900; }

/* ── SR Forecast ───────────────────────────── */
.sr-algo-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 800;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 8px;
  vertical-align: middle;
  letter-spacing: 0.05em;
}
.sr-forecast {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  margin-top: 14px;
  min-height: 60px;
}
.sr-forecast-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  gap: 4px;
}
.sr-forecast-bar {
  width: 100%;
  background: linear-gradient(180deg, #6366f1, #818cf8);
  border-radius: 4px 4px 0 0;
  min-height: 4px;
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 2px;
  transition: height .3s;
}
.sr-forecast-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* ─── Topic bars ─── */
.topic-bars { display: flex; flex-direction: column; gap: 10px; }

.topic-bar {
  display: grid;
  grid-template-columns: 160px 1fr 100px;
  gap: 14px;
  align-items: center;
  font-size: 13px;
}

.topic-bar-label {
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

.topic-bar-track {
  height: 12px;
  background: var(--surface-soft);
  border-radius: 999px;
  overflow: hidden;
  border: 2px solid var(--border);
}

.topic-bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.5s var(--easing);
}

.topic-bar-fill.high { background: linear-gradient(90deg, var(--duo-green-light), var(--duo-green)); }
.topic-bar-fill.mid  { background: linear-gradient(90deg, #FFAA1A, var(--duo-orange)); }
.topic-bar-fill.low  { background: linear-gradient(90deg, #FF7575, var(--duo-red)); }

.topic-bar-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  text-align: right;
  color: var(--text-secondary);
}

/* ─── Empty state ─── */
.empty-state {
  text-align: center;
  padding: 32px 20px;
  color: var(--text-muted);
  font-size: 14px;
  font-style: italic;
  font-weight: 600;
}

/* ─── Review tab ─── */
.review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.review-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.review-item {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  border-left: 6px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s var(--easing);
}
.review-item:hover { transform: translateX(2px); }

.review-item.correct { border-left-color: var(--duo-green); }
.review-item.wrong   { border-left-color: var(--duo-red); }
.review-item.skipped { border-left-color: var(--duo-orange); }

.review-item-head {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 700;
  flex-wrap: wrap;
}

.review-item.correct .review-item-head strong { color: var(--duo-green-dark); }
.review-item.wrong   .review-item-head strong { color: var(--duo-red-dark); }
.review-item.skipped .review-item-head strong { color: var(--duo-orange-dark); }

.review-item-q {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.review-item-detail {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
}

.review-item-explanation {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 2px dashed var(--border);
  font-size: 13px;
  color: var(--text-secondary);
  white-space: pre-wrap;
  line-height: 1.6;
}

/* ─── Footer ─── */
.app-footer {
  text-align: center;
  padding: 16px 28px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 2px solid var(--border);
  background: var(--surface);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-weight: 600;
}

/* ─── Theory modal ─── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(75, 75, 75, 0.55);
  backdrop-filter: blur(4px);
  z-index: 500;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.18s var(--easing);
}
.modal-overlay:not([hidden]) { display: flex; }

.modal-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 640px;
  height: 80vh;
  max-height: 680px;
  min-height: 480px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slideUp 0.25s var(--easing);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-card--wide { max-width: 880px; height: 85vh; max-height: 780px; }

/* ── Formula Sheet ─────────────────────────────── */
.formula-sheet {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-content: start;
}
@media (max-width: 600px) {
  .formula-sheet { grid-template-columns: 1fr; }
}
.formula-section h3 {
  font-size: 13px;
  font-weight: 800;
  color: #6366f1;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 8px;
  padding-bottom: 4px;
  border-bottom: 2px solid rgba(99,102,241,.2);
}
.formula-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.formula-row:last-child { border-bottom: none; }
.formula-name {
  color: var(--text-secondary);
  font-weight: 600;
  min-width: 110px;
  flex-shrink: 0;
}
.formula-row code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-primary);
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
}
.formula-row--ds {
  align-items: center;
  gap: 10px;
}
.ds-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  font-weight: 800;
  font-size: 12px;
  border-radius: 6px;
  flex-shrink: 0;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px 18px;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}

.modal-title-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.modal-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  background: var(--duo-purple-bg);
  border: 2px solid var(--duo-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  color: var(--duo-purple-dark);
  font-family: 'JetBrains Mono', monospace;
  flex-shrink: 0;
  box-shadow: 0 3px 0 var(--duo-purple-dark);
}

.modal-title {
  margin: 0;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.modal-close {
  background: var(--surface-soft);
  border: 2px solid var(--border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 14px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s var(--easing);
  flex-shrink: 0;
  box-shadow: 0 3px 0 var(--border);
}
.modal-close:hover {
  background: var(--duo-red-bg);
  color: var(--duo-red);
  border-color: var(--duo-red);
  box-shadow: 0 3px 0 var(--duo-red);
}
.modal-close:active { transform: translateY(3px); box-shadow: none; }

.modal-tabs {
  display: flex;
  gap: 4px;
  padding: 0 22px;
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
}

.modal-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 13px 16px;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s var(--easing);
  white-space: nowrap;
}
.modal-tab:hover { color: var(--text-primary); }
.modal-tab.active { color: var(--duo-purple-dark); border-bottom-color: var(--duo-purple); }

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  min-height: 320px;
}

.modal-panel { display: none; }
.modal-panel.active { display: block; animation: fadeIn 0.18s var(--easing); }

/* Concept panel */
.theory-summary {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-primary);
  margin: 0 0 20px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
}

.theory-facts {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.theory-fact {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  line-height: 1.55;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  transition: all 0.12s var(--easing);
  color: var(--text-primary);
}
.theory-fact:hover {
  border-color: var(--duo-blue);
  background: var(--duo-blue-bg);
}

.theory-fact-bullet {
  color: var(--duo-blue);
  font-weight: 800;
  flex-shrink: 0;
}

/* Example panel */
.ex-label {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.ex-text {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 20px;
  padding: 14px 16px;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
}

.example-steps { margin-bottom: 20px; }

.ex-step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  font-size: 14px;
  line-height: 1.55;
  border-bottom: 1px dashed var(--border);
  color: var(--text-primary);
  font-weight: 500;
}
.ex-step:last-child { border-bottom: none; }

.ex-step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--duo-blue-bg);
  color: var(--duo-blue-dark);
  font-size: 12px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 2px solid var(--duo-blue);
}

.ex-answer {
  padding: 14px 16px;
  background: var(--duo-green-bg);
  border: 2px solid var(--duo-green);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  color: var(--duo-green-dark);
}

.ex-answer-label { color: var(--duo-green-dark); margin-right: 8px; font-weight: 800; }

/* Traps panel */
.traps-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.trap-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--duo-red-bg);
  border: 2px solid var(--duo-red);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.55;
  color: var(--duo-red-dark);
  font-weight: 600;
}

.trap-icon {
  color: var(--duo-red);
  font-size: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

/* Steps panel */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: step-counter;
}

.step-item {
  counter-increment: step-counter;
  padding: 14px 16px;
  padding-left: 56px;
  position: relative;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-primary);
  font-weight: 600;
}

.step-item::before {
  content: counter(step-counter);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--duo-purple);
  color: white;
  font-size: 13px;
  font-weight: 800;
  text-align: center;
  line-height: 28px;
  border: 2px solid var(--duo-purple-dark);
}

.modal-footer {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding: 18px 26px;
  border-top: 2px solid var(--border);
  flex-shrink: 0;
  background: var(--surface);
}

/* ─── Body scroll lock ─── */
body.modal-open { overflow: hidden; }

/* ════════════════════════════════════════════════
   Animations
   ════════════════════════════════════════════════ */

@keyframes bounceIn {
  0%   { transform: scale(0.3); opacity: 0; }
  50%  { transform: scale(1.08); opacity: 1; }
  70%  { transform: scale(0.95); }
  100% { transform: scale(1); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15%       { transform: translateX(-8px) rotate(-1deg); }
  30%       { transform: translateX(8px) rotate(1deg); }
  45%       { transform: translateX(-6px); }
  60%       { transform: translateX(6px); }
  75%       { transform: translateX(-4px); }
  90%       { transform: translateX(4px); }
}
@keyframes floatUp {
  0%   { opacity: 1; transform: translateY(0) scale(1) translateX(-50%); }
  100% { opacity: 0; transform: translateY(-60px) scale(0.7) translateX(-50%); }
}
@keyframes pop {
  0%   { transform: scale(1); }
  30%  { transform: scale(1.3); }
  60%  { transform: scale(0.9); }
  100% { transform: scale(1); }
}
@keyframes glowPulse {
  0%, 100% { filter: brightness(1) drop-shadow(0 0 4px rgba(255,150,0,0.4)); }
  50%       { filter: brightness(1.2) drop-shadow(0 0 12px rgba(255,150,0,0.9)); }
}
@keyframes confettiFall {
  0%   { transform: translateY(-20px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(360px) rotate(720deg); opacity: 0; }
}

.anim-bounce-in { animation: bounceIn 0.5s var(--easing); }
.anim-shake { animation: shake 0.5s var(--easing); }
.anim-pop { animation: pop 0.4s var(--easing); }

/* Confetti pieces (spawned by JS) */
.confetti-piece {
  position: fixed;
  top: -20px;
  pointer-events: none;
  z-index: 9999;
  animation: confettiFall linear forwards;
}

/* Floating XP text (spawned by JS) */
.xp-float {
  position: fixed;
  font-size: 22px;
  font-weight: 900;
  color: var(--duo-yellow);
  pointer-events: none;
  z-index: 9999;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2), 0 0 8px rgba(255,200,0,0.5);
  animation: floatUp 800ms ease-out forwards;
  font-family: 'Nunito', sans-serif;
  letter-spacing: 0.02em;
}

/* ─── Charts ─── */
.dash-charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.dash-chart-card {
  background: var(--bg-card);
  border-radius: 18px;
  border: 2px solid var(--border);
  padding: 20px;
}
.dash-chart-card .dash-section-title {
  margin: 0 0 14px;
}
.chart-wrap {
  position: relative;
  height: 200px;
}
.chart-wrap--donut {
  height: 200px;
}
.chart-wrap--tall {
  height: 280px;
  margin-bottom: 0;
}
@media (max-width: 720px) {
  .dash-charts-row { grid-template-columns: 1fr; }
  .chart-wrap { height: 160px; }
  .chart-wrap--tall { height: 220px; }
}

/* ════════════════════════════════════════════════
   Duolingo Quality Pack — XP/Level/Hearts/Goal/Combo
   ════════════════════════════════════════════════ */

/* Brand row with level badge */
.brand-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.level-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px 3px 7px;
  border-radius: 999px;
  background: linear-gradient(180deg, #FFD840 0%, #FFC800 100%);
  color: #4A3800;
  font-weight: 900;
  font-size: 11px;
  letter-spacing: 0.04em;
  border: 2px solid var(--duo-yellow-dark);
  box-shadow: 0 2px 0 var(--duo-yellow-dark);
  white-space: nowrap;
  transition: transform 0.15s var(--easing);
}
.level-badge:hover { transform: translateY(-1px); }
.level-badge-star { font-size: 12px; line-height: 1; }
.level-badge-text { font-family: 'Nunito', sans-serif; }

/* Hearts display in header */
.hearts-display {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--duo-red-bg);
  border: 2px solid var(--duo-red);
  font-size: 14px;
  line-height: 1;
  min-height: 30px;
}
.heart-icon {
  display: inline-block;
  font-size: 14px;
  filter: saturate(1.1);
  transition: opacity 0.3s ease, transform 0.3s ease, filter 0.3s ease;
}
.heart-icon.empty {
  opacity: 0.35;
  filter: grayscale(0.8);
}
.heart-icon.breaking {
  animation: heartBreak 0.55s var(--easing) forwards;
}
@keyframes heartBreak {
  0%   { transform: scale(1) rotate(0deg); opacity: 1; }
  20%  { transform: scale(1.4) rotate(-5deg); }
  40%  { transform: scale(0.85) rotate(8deg); opacity: 0.95; }
  100% { transform: scale(0.9) rotate(0deg); opacity: 0.35; filter: grayscale(0.8); }
}

/* XP bar */
.xp-bar-wrap {
  position: sticky;
  top: 75px;
  z-index: 98;
  height: 4px;
  background: transparent;
  overflow: hidden;
  transition: opacity 0.3s;
}
/* Hide XP bar on practice tab — question card has its own timer bar */
body[data-active-tab="practice"] .xp-bar-wrap { display: none; }
.xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--duo-green-light) 0%, var(--duo-green) 100%);
  width: 0%;
  transition: width 0.5s var(--easing);
  box-shadow: 0 0 8px rgba(88, 204, 2, 0.5);
}
.xp-bar-text {
  position: absolute;
  right: 12px;
  top: -1px;
  font-size: 10px;
  font-weight: 800;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  background: var(--surface);
  padding: 0 6px;
  border-radius: 4px;
  pointer-events: none;
}
/* Tab bar sits below the XP bar now */
.tab-bar { top: 83px; }

/* Daily goal ring */
.daily-goal-ring {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
}
.daily-goal-ring svg { display: block; }
.daily-goal-ring #goal-ring-arc {
  transition: stroke-dashoffset 0.5s var(--easing), stroke 0.3s ease;
}
.daily-goal-ring.complete #goal-ring-arc { stroke: var(--duo-yellow); }
.daily-goal-text {
  position: absolute;
  font-size: 9px;
  font-weight: 900;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1;
}
.daily-goal-ring.complete .daily-goal-text { color: var(--duo-yellow-dark); }

/* Sound toggle */
.sound-toggle {
  background: var(--surface-soft);
  border: 2px solid var(--border);
  width: 38px; height: 38px;
  border-radius: 50%;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s var(--easing);
  box-shadow: 0 2px 0 var(--border);
  padding: 0;
}
.sound-toggle:hover { border-color: var(--duo-blue); }
.sound-toggle:active { transform: translateY(2px); box-shadow: none; }
[data-sound="off"] .sound-icon-on { display: none; }
[data-sound="on"]  .sound-icon-off { display: none; }

/* Combo counter (top-center floating) */
.combo-badge {
  position: fixed;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  background: linear-gradient(180deg, #FFAA1A 0%, #FF7A1A 100%);
  color: white;
  padding: 8px 18px 8px 14px;
  border-radius: 999px;
  border: 3px solid #FFC547;
  box-shadow: 0 6px 0 #C45A00, 0 8px 24px rgba(255, 130, 0, 0.4);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-shadow: 0 1px 2px rgba(0,0,0,0.25);
  animation: comboPop 0.4s var(--easing);
}
.combo-badge .combo-fire {
  font-size: 20px;
  animation: glowPulse 1.2s ease-in-out infinite;
}
@keyframes comboPop {
  0%   { transform: translateX(-50%) scale(0.3) translateY(-20px); opacity: 0; }
  60%  { transform: translateX(-50%) scale(1.15) translateY(0); opacity: 1; }
  100% { transform: translateX(-50%) scale(1) translateY(0); }
}

/* Toast container + achievement toasts */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 24px;     /* opposite corner from cat mascot (bottom-right) */
  right: auto;
  z-index: 9000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.achievement-toast {
  background: var(--surface);
  border: 2px solid var(--duo-yellow);
  border-radius: var(--radius-lg);
  box-shadow: 0 6px 0 var(--duo-yellow-dark), 0 10px 32px rgba(0,0,0,0.18);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 260px;
  max-width: 340px;
  pointer-events: none; /* toasts are cosmetic — don't block interactions */
  animation: toastSlide 0.45s var(--easing);
}
.achievement-toast.exiting {
  animation: toastExit 0.4s var(--easing) forwards;
}
@keyframes toastSlide {
  from { opacity: 0; transform: translateX(-110%); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes toastExit {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(-110%); }
}
.achievement-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--duo-yellow-bg);
  border: 2px solid var(--duo-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
  box-shadow: 0 2px 0 var(--duo-yellow-dark);
}
.achievement-text { flex: 1; min-width: 0; }
.achievement-label {
  font-size: 10px;
  font-weight: 900;
  color: var(--duo-yellow-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.achievement-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 2px;
}
.achievement-desc {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  margin-top: 2px;
}

/* Goal toast variant */
.goal-toast { border-color: var(--duo-green); box-shadow: 0 6px 0 var(--duo-green-dark), 0 10px 32px rgba(0,0,0,0.18); }
.goal-toast .achievement-icon { background: var(--duo-green-bg); border-color: var(--duo-green); box-shadow: 0 2px 0 var(--duo-green-dark); }
.goal-toast .achievement-label { color: var(--duo-green-dark); }

/* Level-up overlay */
.levelup-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(255, 200, 0, 0.35) 0%, rgba(0,0,0,0.55) 65%);
  z-index: 8000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s var(--easing);
  pointer-events: none; /* let clicks pass through — overlay is purely cosmetic */
}
.levelup-overlay:not([hidden]) { display: flex; }
.levelup-content {
  position: relative;
  text-align: center;
  color: white;
  font-family: 'Nunito', sans-serif;
  animation: levelupBounce 0.7s var(--easing);
}
@keyframes levelupBounce {
  0%   { transform: scale(0.4); opacity: 0; }
  50%  { transform: scale(1.15); opacity: 1; }
  70%  { transform: scale(0.95); }
  100% { transform: scale(1); }
}
.levelup-burst {
  position: absolute;
  inset: -80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 200, 0, 0.5) 0%, rgba(255, 200, 0, 0) 70%);
  animation: glowPulse 1s ease-in-out infinite;
  z-index: -1;
}
.levelup-star {
  font-size: 120px;
  line-height: 1;
  filter: drop-shadow(0 0 24px rgba(255, 200, 0, 0.9));
  animation: pop 0.8s var(--easing);
}
.levelup-title {
  font-size: 56px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-shadow: 0 4px 0 #C45A00, 0 0 24px rgba(255, 200, 0, 0.6);
  margin-top: 12px;
  background: linear-gradient(180deg, #FFE066 0%, #FFC800 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.levelup-sub {
  font-size: 22px;
  font-weight: 800;
  margin-top: 8px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.5);
  color: white;
  -webkit-text-fill-color: white;
}

/* Session summary modal */
.modal-card-small {
  max-width: 480px;
  height: auto;
  min-height: unset;
}
.modal-card-small .modal-body {
  flex: none;      /* don't expand — let content determine height */
  min-height: unset;
}
.summary-card { animation: bounceIn 0.5s var(--easing); }
.summary-card .modal-header {
  border-bottom: none;
  padding: 28px 26px 8px;
  background: linear-gradient(180deg, var(--duo-green-bg) 0%, transparent 100%);
}
.summary-trophy {
  font-size: 64px;
  line-height: 1;
  animation: pop 0.6s var(--easing);
  filter: drop-shadow(0 4px 8px rgba(255, 200, 0, 0.5));
}
.summary-title {
  font-size: 28px !important;
  color: var(--duo-green-dark) !important;
}
.summary-message {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-secondary);
}
.summary-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 4px 0 12px;
}
.summary-stat {
  text-align: center;
  padding: 14px 8px;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  border-radius: var(--radius);
}
.summary-stat-icon {
  font-size: 22px;
  margin-bottom: 6px;
  font-weight: 900;
}
.summary-stat-value {
  font-size: 22px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}
.summary-stat-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 800;
  margin-top: 4px;
}
.btn-large {
  padding: 14px 32px;
  font-size: 15px;
  border-radius: var(--radius-lg);
}

/* ── Session Summary Enhancements ──────────── */
.summary-score-delta {
  text-align: center;
  margin: 12px 0 4px;
  font-size: 14px;
}
.summary-score-delta-label { color: var(--text-secondary); margin-right: 8px; font-weight: 600; }
.summary-score-delta-value { font-weight: 800; font-size: 16px; }
.summary-score-delta-value.delta-up { color: #22c55e; }
.summary-score-delta-value.delta-down { color: #ef4444; }
.summary-type-breakdown { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 10px; }
.summary-type-title { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); margin-bottom: 8px; }
.summary-type-row { display: flex; justify-content: space-between; align-items: center; padding: 4px 0; font-size: 12px; border-bottom: 1px solid var(--border); }
.summary-type-row:last-child { border-bottom: none; }
.summary-type-name { color: var(--text-primary); font-weight: 700; }
.summary-type-acc { font-weight: 700; }
.summary-type-acc--ok  { color: #16a34a; }
.summary-type-acc--mid { color: #d97706; }
.summary-type-acc--low { color: #dc2626; }

/* Summary topic breakdown */
.summary-topic-breakdown {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.summary-topic-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: 12px;
}
.summary-topic-name {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 130px;
  max-width: 170px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-shrink: 0;
}
.summary-topic-bar-wrap {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.summary-topic-bar {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}
.summary-topic-bar--ok   { background: #22c55e; }
.summary-topic-bar--mid  { background: #f59e0b; }
.summary-topic-bar--low  { background: #ef4444; }
.summary-topic-bar--none { background: var(--border); } /* 0% = neutral, not red */
.summary-topic-pct { font-weight: 700; font-size: 11px; min-width: 30px; text-align: right; }
.summary-type-acc--none { color: var(--text-secondary); }

/* Summary next-action tip */
.summary-next-tip {
  margin-top: 12px;
  padding: 10px 12px;
  background: var(--duo-blue-bg);
  border-radius: 10px;
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.5;
}
[data-theme="dark"] .summary-next-tip { background: #1a2a3a; }

/* Question card timer arc bar */
.qcard-timer-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--border);
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
  overflow: hidden;
}
.qcard-timer-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--duo-green);
  transition: width 0.5s linear, background 0.3s ease;
}
.qcard-timer-bar-fill.warn { background: var(--duo-orange); }
.qcard-timer-bar-fill.over { background: var(--duo-red); }

/* New-question entrance animation */
.question-card.entering {
  animation: cardSlideUp 0.4s var(--easing);
}
@keyframes cardSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Mobile ─── */
@media (max-width: 720px) {
  .app-header { padding: 12px 16px; }
  .app-main { padding: 16px; }
  .tab-bar { padding: 0 16px; }
  .tab-btn { padding: 14px 12px; font-size: 12px; }
  .header-stats { gap: 6px; }
  .stat-pill { padding: 5px 10px; font-size: 12px; }
  .stat-pill-label { display: none; }
  .session-tracker { grid-template-columns: repeat(3, 1fr); padding: 14px 8px; }
  .session-tracker .session-stat:nth-child(3) { border-right: none; }
  .session-tracker .session-stat:nth-child(4),
  .session-tracker .session-stat:nth-child(5) { grid-column: span 1; }
  .session-stat-value { font-size: 22px; }
  .dashboard-grid { grid-template-columns: repeat(2, 1fr); }
  .dash-card.big { grid-column: span 1; }
  .dash-card-value { font-size: 30px; }
  .topic-bar { grid-template-columns: 110px 1fr 80px; font-size: 12px; gap: 10px; }
  .qcard-question { font-size: 16px; }
  .app-footer { font-size: 11px; }
  .app-footer span:last-child { display: none; }
  .modal-card { max-height: 92vh; }
  .modal-header { padding: 16px 18px 12px; }
  .modal-body { padding: 16px; }
  .modal-footer { padding: 14px 18px; }
  .modal-title { font-size: 18px; }
  .modal-icon { width: 40px; height: 40px; font-size: 16px; }
  .feedback-actions { gap: 8px; }
  .btn { padding: 12px 16px; font-size: 13px; }
  .btn-small { padding: 8px 12px; font-size: 11px; }
  .feedback-actions .btn { padding: 9px 12px; font-size: 11px; }
  .qcard-actions { gap: 8px; }
  .xp-bar-wrap { top: 65px; }
  .tab-bar { top: 73px; }
  .level-badge { padding: 2px 7px 2px 5px; font-size: 10px; }
  .hearts-display { padding: 4px 8px; }
  .heart-icon { font-size: 12px; }
  .daily-goal-ring { width: 32px; height: 32px; }
  .daily-goal-ring svg { width: 32px; height: 32px; }
  .daily-goal-text { font-size: 8px; }
  .sound-toggle { width: 32px; height: 32px; font-size: 12px; }
  .levelup-star { font-size: 80px; }
  .levelup-title { font-size: 36px; }
  .levelup-sub { font-size: 16px; }
  .achievement-toast { min-width: 220px; }
  .summary-stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .summary-stat-value { font-size: 18px; }
  .combo-badge { top: 80px; font-size: 14px; padding: 6px 14px 6px 12px; }
  .mastery-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .records-row { grid-template-columns: repeat(2, 1fr); }
}

/* ════════════════════════════════════════════════════
   Tier 2 enhancements: mastery, records, export, adaptive
   ════════════════════════════════════════════════════ */

/* Adaptive level badge in question card */
.badge-adaptive {
  background: var(--duo-blue-bg);
  color: var(--duo-blue-dark);
  border: 2px solid var(--duo-blue);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  box-shadow: 0 2px 0 var(--duo-blue-dark);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.badge-adaptive[data-level="hard"] {
  background: var(--duo-red-bg);
  color: var(--duo-red-dark);
  border-color: var(--duo-red);
  box-shadow: 0 2px 0 var(--duo-red-dark);
}
.badge-adaptive[data-level="easy"] {
  background: var(--duo-green-bg);
  color: var(--duo-green-dark);
  border-color: var(--duo-green);
  box-shadow: 0 2px 0 var(--duo-green-dark);
}
[hidden].badge-adaptive { display: none !important; }

/* Topic Mastery */
.mastery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.mastery-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 16px 14px;
  position: relative;
  transition: transform 0.18s var(--easing), box-shadow 0.18s var(--easing);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.mastery-card:hover { transform: translateY(-2px); }
.mastery-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
}
.mastery-green::before  { background: var(--duo-green);  }
.mastery-blue::before   { background: var(--duo-blue);   }
.mastery-orange::before { background: var(--duo-orange); }
.mastery-purple::before { background: var(--duo-purple); }

.mastery-green  .mastery-topic { color: var(--duo-green-dark);  }
.mastery-blue   .mastery-topic { color: var(--duo-blue-dark);   }
.mastery-orange .mastery-topic { color: var(--duo-orange-dark); }
.mastery-purple .mastery-topic { color: var(--duo-purple-dark); }

.mastery-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 8px;
}
.mastery-topic {
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mastery-acc {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
}
.mastery-stars {
  display: flex;
  gap: 2px;
  margin: 4px 0 8px;
  font-size: 18px;
  line-height: 1;
}
.mastery-star {
  color: var(--border-strong);
  font-weight: 900;
}
.mastery-star.filled {
  color: var(--duo-yellow);
  text-shadow: 0 1px 0 var(--duo-yellow-dark);
}
.mastery-stat {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
}

/* Personal Records */
.records-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.record-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 12px;
  text-align: center;
  position: relative;
  transition: transform 0.18s var(--easing);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.record-card:hover { transform: translateY(-2px); }
.record-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
}
.record-orange::before { background: var(--duo-orange); }
.record-yellow::before { background: var(--duo-yellow); }
.record-green::before  { background: var(--duo-green);  }
.record-purple::before { background: var(--duo-purple); }
.record-blue::before   { background: var(--duo-blue);   }

.record-icon {
  font-size: 24px;
  line-height: 1;
  margin-bottom: 6px;
}
.record-value {
  font-size: 22px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.record-orange .record-value { color: var(--duo-orange-dark); }
.record-yellow .record-value { color: var(--duo-yellow-dark); }
.record-green  .record-value { color: var(--duo-green-dark);  }
.record-purple .record-value { color: var(--duo-purple-dark); }
.record-blue   .record-value { color: var(--duo-blue-dark);   }
.record-label {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
  margin-top: 4px;
}

/* Export preview */
.export-preview {
  background: var(--surface-soft);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-top: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-primary);
  white-space: pre-wrap;
  overflow-x: auto;
}
[hidden].export-preview { display: none !important; }

/* Timer arc — refined: green (<75%), yellow (75-90%), red (>=90%), pulse over 2 min */
.qcard-timer-bar-fill {
  transition: width 0.5s linear, background-color 1s ease;
}
.qcard-timer-bar-fill.warn { background: var(--duo-yellow); }
.qcard-timer-bar-fill.over { background: var(--duo-red);    }
.qcard-timer-bar-fill.pulsing {
  animation: timerPulse 1.4s ease-in-out infinite;
}
@keyframes timerPulse {
  0%, 100% { opacity: 1;   filter: brightness(1); }
  50%      { opacity: 0.5; filter: brightness(1.3); }
}

/* ════════════════════════════════════════════════════
   Third pass: review subtabs, settings, animations,
   empty states, keyboard help, hard mode
   ════════════════════════════════════════════════════ */

/* ── Review subtabs ── */
.review-subtabs {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
  border-bottom: 2px solid var(--border);
}
.review-subtab {
  background: none;
  border: none;
  padding: 10px 18px;
  font-family: inherit;
  font-weight: 800;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s var(--easing), border-color 0.15s var(--easing);
}
.review-subtab:hover { color: var(--text-primary); }
.review-subtab.active {
  color: var(--duo-blue-dark);
  border-bottom-color: var(--duo-blue);
}
.review-subpanel { display: block; }
.review-subpanel[hidden] { display: none; }

/* ── Review stats ── */
.chart-wrap--small {
  height: 200px;
  max-width: 320px;
  margin: 0 auto;
}
.review-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.review-stats-card { margin-top: 0; }
@media (max-width: 720px) {
  .review-stats-grid { grid-template-columns: 1fr; }
}

.topic-perf-table-wrap { overflow-x: auto; }
.topic-perf-table {
  width: 100%;
  border-collapse: collapse;
  font-family: inherit;
  font-weight: 600;
  font-size: 13px;
}
.topic-perf-table thead th {
  text-align: left;
  padding: 10px 12px;
  background: var(--surface-soft);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 11px;
  font-weight: 800;
  border-bottom: 2px solid var(--border);
}
.topic-perf-table tbody td {
  padding: 10px 12px;
  border-bottom: 2px solid var(--border);
  color: var(--text-primary);
}
.topic-perf-table tbody tr:hover { background: var(--surface-soft); }
.topic-perf-table .acc-cell { font-family: 'JetBrains Mono', monospace; font-weight: 700; }
.topic-perf-table .acc-high { color: var(--duo-green-dark); }
.topic-perf-table .acc-mid  { color: var(--duo-yellow-dark); }
.topic-perf-table .acc-low  { color: var(--duo-red-dark); }
.trend-arrow { font-size: 16px; font-weight: 900; }
.trend-up   { color: var(--duo-green-dark); }
.trend-down { color: var(--duo-red-dark); }
.trend-flat { color: var(--text-muted); }

.hardest-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.hardest-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-left: 4px solid var(--duo-red);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}
.hardest-item .hardest-rank {
  font-weight: 900;
  color: var(--duo-red-dark);
  min-width: 20px;
}
.hardest-item .hardest-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.hardest-item .hardest-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.fastest-card {
  text-align: center;
  padding: 18px;
  background: var(--duo-blue-bg);
  border: 2px solid var(--duo-blue);
  border-radius: var(--radius-lg);
}
.fastest-card .fastest-topic {
  font-size: 22px;
  font-weight: 900;
  color: var(--duo-blue-dark);
  margin-bottom: 4px;
}
.fastest-card .fastest-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 700;
}

/* ── Retry button on review item ── */
.review-item-actions {
  margin-top: 10px;
}
.btn-retry-mini {
  font-family: inherit;
  font-size: 12px;
  font-weight: 800;
  background: var(--duo-blue-bg);
  color: var(--duo-blue-dark);
  border: 2px solid var(--duo-blue);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  box-shadow: 0 2px 0 var(--duo-blue);
  transition: transform 0.1s var(--press-easing), box-shadow 0.1s var(--press-easing);
}
.btn-retry-mini:hover {
  transform: translateY(-1px);
  box-shadow: 0 3px 0 var(--duo-blue);
}
.btn-retry-mini:active {
  transform: translateY(2px);
  box-shadow: 0 0 0 var(--duo-blue);
}

/* ── Settings ── */
.settings-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.setting-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 2px solid var(--border);
}
.setting-row:last-child { border-bottom: none; }
.setting-label { flex: 1; min-width: 0; }
.setting-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.setting-desc {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
}
.setting-control {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.setting-value {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 14px;
  color: var(--duo-blue-dark);
  min-width: 30px;
  text-align: right;
}
.setting-control input[type="range"] {
  width: 140px;
  accent-color: var(--duo-blue);
}
.setting-control select {
  padding: 8px 12px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-primary);
  cursor: pointer;
}

/* Toggle switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--border-strong);
  border-radius: 26px;
  transition: background 0.2s var(--easing);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  left: 3px; top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s var(--easing);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.toggle-switch input:checked + .toggle-slider {
  background: var(--duo-green);
}
.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(22px);
}

/* ── Question card animation upgrades ── */
.choice {
  opacity: 1;
}
.question-card.entering .choice {
  animation: choiceFadeIn 0.3s var(--easing) backwards;
}
.question-card.entering .choice:nth-child(1) { animation-delay: 0.05s; }
.question-card.entering .choice:nth-child(2) { animation-delay: 0.10s; }
.question-card.entering .choice:nth-child(3) { animation-delay: 0.15s; }
.question-card.entering .choice:nth-child(4) { animation-delay: 0.20s; }
.question-card.entering .choice:nth-child(5) { animation-delay: 0.25s; }
@keyframes choiceFadeIn {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* Wrong-answer flash */
.choice.wrong.flash-wrong {
  animation: flashRed 0.5s var(--easing);
}
@keyframes flashRed {
  0%   { background: var(--duo-red-bg); }
  50%  { background: var(--duo-red); color: white; }
  100% { background: var(--duo-red-bg); }
}

/* Correct-answer green pulse */
.choice.correct.pulse-correct {
  animation: pulseGreen 0.6s var(--easing);
  box-shadow: 0 0 0 4px rgba(88,204,2,0.3), 0 2px 0 var(--duo-green);
}
@keyframes pulseGreen {
  0%   { transform: scale(1);    box-shadow: 0 0 0 0 rgba(88,204,2,0.5), 0 2px 0 var(--duo-green); }
  50%  { transform: scale(1.02); box-shadow: 0 0 0 8px rgba(88,204,2,0.4), 0 2px 0 var(--duo-green); }
  100% { transform: scale(1);    box-shadow: 0 0 0 4px rgba(88,204,2,0.3), 0 2px 0 var(--duo-green); }
}

/* Card bounce on correct */
.question-card.correct-bounce {
  animation: cardBounce 0.4s var(--easing);
}
@keyframes cardBounce {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.015); }
  100% { transform: scale(1); }
}

/* ── Hard mode hides timer ── */
.hard-mode .timer { visibility: hidden; }
.hard-mode .qcard-timer-bar { visibility: hidden; }

/* ── Friendly empty state ── */
.empty-state-rich {
  text-align: center;
  padding: 36px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.empty-state-mascot {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--duo-yellow-bg);
  border: 4px solid var(--duo-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
  line-height: 1;
  box-shadow: 0 4px 0 var(--duo-yellow-dark);
  animation: mascotFloat 2.4s ease-in-out infinite;
}
@keyframes mascotFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-4px); }
}
.empty-state-title {
  font-size: 18px;
  font-weight: 900;
  color: var(--text-primary);
}
.empty-state-msg {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  max-width: 320px;
}
.empty-state-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 4px;
}

/* ── Keyboard help button + modal ── */
.help-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-left: 8px;
  border-radius: 50%;
  background: var(--duo-blue-bg);
  color: var(--duo-blue-dark);
  border: 2px solid var(--duo-blue);
  font-family: inherit;
  font-weight: 900;
  font-size: 12px;
  cursor: pointer;
  box-shadow: 0 2px 0 var(--duo-blue-dark);
  transition: transform 0.1s var(--press-easing), box-shadow 0.1s var(--press-easing);
  vertical-align: middle;
  line-height: 1;
}
.help-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 3px 0 var(--duo-blue-dark);
}
.help-btn:active {
  transform: translateY(2px);
  box-shadow: 0 0 0 var(--duo-blue-dark);
}
.footer-shortcuts {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
}
.shortcut-table td {
  padding: 8px 10px;
  border-bottom: 2px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}
.shortcut-table tr:last-child td { border-bottom: none; }
.shortcut-table td:first-child {
  width: 100px;
  white-space: nowrap;
}
.shortcut-table kbd {
  display: inline-block;
  padding: 2px 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 800;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 2px 0 var(--border);
  color: var(--text-primary);
  margin-right: 2px;
}

/* ─── Verbal: type badges (CR/SC/RC) ─── */
.badge-type[data-qtype="CR"] {
  color: var(--duo-purple-dark);
  border-color: var(--duo-purple);
  background: var(--duo-purple-bg);
}
.badge-type[data-qtype="SC"] {
  color: var(--duo-orange-dark);
  border-color: var(--duo-orange);
  background: var(--duo-orange-bg);
}
.badge-type[data-qtype="RC"] {
  color: var(--duo-blue-dark);
  border-color: var(--duo-blue);
  background: var(--duo-blue-bg);
}

/* ─── Verbal: Reading Comprehension passage panel ─── */
.rc-passage-panel {
  margin: 4px 0 16px;
  padding: 14px 16px 12px;
  border-radius: 12px;
  background: var(--duo-blue-bg);
  border: 2px solid var(--border);
  border-left: 4px solid var(--duo-blue);
  box-shadow: 0 2px 0 var(--border);
}

.rc-passage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.rc-passage-label {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--duo-blue-dark);
}

.rc-passage-toggle {
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--surface);
  border: 2px solid var(--duo-blue);
  color: var(--duo-blue-dark);
  cursor: pointer;
  transition: background 0.15s var(--easing);
}
.rc-passage-toggle:hover { background: var(--duo-blue-bg); }

.rc-passage-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-height: 240px;
  overflow-y: auto;
  white-space: pre-wrap;
  padding-right: 4px;
}

.rc-passage-panel.collapsed .rc-passage-text {
  display: none;
}

/* ─── Verbal: Section accent (purple for Verbal questions) ─── */
.question-card[data-section="Verbal"] {
  border-color: var(--duo-purple);
  box-shadow: 0 4px 0 var(--duo-purple-bg), var(--shadow);
}
.question-card[data-section="Verbal"] .qcard-meta {
  border-bottom-color: var(--duo-purple);
}
.question-card[data-section="Verbal"] .qcard-timer-bar {
  background: var(--duo-purple-bg);
}

/* ─── Verbal: CR subtopic pill ─── */
.badge-cr-pill {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: none;
}
.badge-cr-pill.cr-pill-red    { color: var(--duo-red-dark);    border-color: var(--duo-red);    background: var(--duo-red-bg); }
.badge-cr-pill.cr-pill-green  { color: var(--duo-green-dark);  border-color: var(--duo-green);  background: var(--duo-green-bg); }
.badge-cr-pill.cr-pill-blue   { color: var(--duo-blue-dark);   border-color: var(--duo-blue);   background: var(--duo-blue-bg); }
.badge-cr-pill.cr-pill-yellow { color: var(--duo-yellow-dark); border-color: var(--duo-yellow); background: var(--duo-yellow-bg); }
.badge-cr-pill.cr-pill-orange { color: var(--duo-orange-dark); border-color: var(--duo-orange); background: var(--duo-orange-bg); }
.badge-cr-pill.cr-pill-purple { color: var(--duo-purple-dark); border-color: var(--duo-purple); background: var(--duo-purple-bg); }
.badge-cr-pill.cr-pill-grey   { color: var(--text-secondary);  border-color: var(--border);     background: var(--surface-soft); }
[hidden].badge-cr-pill { display: none !important; }

/* ─── Verbal: SC underline highlighting ─── */
.sc-underline {
  text-decoration: underline;
  text-decoration-color: var(--duo-orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  font-weight: 700;
  color: var(--duo-orange-dark);
  background: linear-gradient(180deg, transparent 60%, var(--duo-orange-bg) 60%);
  padding: 0 2px;
  border-radius: 3px;
}

/* ─── Verbal: RC passage panel improvements ─── */
.rc-passage-panel { transition: border-color 0.2s var(--easing); }
.rc-passage-source {
  display: inline-block;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--surface);
  color: var(--duo-blue-dark);
  border: 1.5px solid var(--duo-blue);
}
.rc-passage-meta {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}
.rc-passage-counter {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--duo-purple-bg);
  color: var(--duo-purple-dark);
  border: 1.5px solid var(--duo-purple);
}
[hidden].rc-passage-source,
[hidden].rc-passage-meta,
[hidden].rc-passage-counter { display: none !important; }

.rc-passage-text p {
  margin: 0 0 12px;
  line-height: 1.7;
}
.rc-passage-text p:last-child { margin-bottom: 0; }

/* Custom scrollbar for long passages */
.rc-passage-text::-webkit-scrollbar { width: 8px; }
.rc-passage-text::-webkit-scrollbar-track {
  background: var(--surface);
  border-radius: 4px;
}
.rc-passage-text::-webkit-scrollbar-thumb {
  background: var(--duo-blue);
  border-radius: 4px;
  border: 2px solid var(--surface);
}
.rc-passage-text::-webkit-scrollbar-thumb:hover {
  background: var(--duo-blue-dark);
}
.rc-passage-text {
  scrollbar-width: thin;
  scrollbar-color: var(--duo-blue) var(--surface);
}

/* ─── Verbal: Dashboard verbal performance section ─── */
.dash-verbal .dash-section-title {
  color: var(--duo-purple-dark);
}
.dash-verbal {
  border-left: 4px solid var(--duo-purple);
  padding-left: 14px;
}
.topic-bar--verbal .topic-bar-fill.high { background: var(--duo-purple); }
.topic-bar--verbal .topic-bar-fill.mid  { background: var(--duo-purple-dark); opacity: 0.7; }
.topic-bar--verbal .topic-bar-fill.low  { background: var(--duo-purple-dark); opacity: 0.45; }
/* ─── Weakness Radar cards ─── */
.weakness-radar-empty {
  color: var(--text-muted);
  font-size: 14px;
  padding: 12px 0;
}
.weakness-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 2px solid var(--duo-red);
  border-left: 6px solid var(--duo-red);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 10px;
  background: rgba(255, 75, 75, 0.05);
  gap: 12px;
}
.weakness-card-info {
  flex: 1;
  min-width: 0;
}
.weakness-card-topic {
  font-weight: 800;
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.weakness-card-stat {
  font-size: 12px;
  color: var(--duo-red);
  font-weight: 700;
  margin-top: 2px;
}
.weakness-card-btn {
  flex-shrink: 0;
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 8px;
  border: 2px solid var(--duo-red);
  background: transparent;
  color: var(--duo-red);
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.weakness-card-btn:hover {
  background: var(--duo-red);
  color: #fff;
}

/* ── Error Journal ─────────────────────────────── */
.review-errors-desc { font-size: 13px; color: var(--text-secondary); margin: 0 0 16px; }

.error-journal-topic {
  margin-bottom: 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.error-journal-topic-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.error-journal-topic-name {
  font-weight: 800;
  font-size: 13px;
  color: var(--text-primary);
}
.error-journal-topic-badge {
  font-size: 11px;
  font-weight: 700;
  background: #fee2e2;
  color: #b91c1c;
  padding: 2px 8px;
  border-radius: 20px;
}
.error-journal-row {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  transition: background .15s;
}
.error-journal-row:last-child { border-bottom: none; }
.error-journal-row:hover { background: var(--bg-secondary); }
.error-journal-q-text {
  font-size: 13px;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}
.error-journal-q-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
}
.error-badge {
  background: #fee2e2;
  color: #b91c1c;
  padding: 1px 6px;
  border-radius: 4px;
}
.error-acc { color: var(--text-secondary); }
.error-acc.acc-low { color: #dc2626; }
.error-acc.acc-mid { color: #d97706; }
.error-acc.acc-ok  { color: #16a34a; }
.error-diff {
  padding: 1px 6px;
  border-radius: 4px;
  text-transform: capitalize;
}
.error-diff.diff-easy   { background: #dcfce7; color: #15803d; }
.error-diff.diff-medium { background: #fef9c3; color: #854d0e; }
.error-diff.diff-hard   { background: #fee2e2; color: #b91c1c; }

/* Score trajectory chart */
.chart-empty-msg {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
  padding: 20px;
}

.verbal-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
  margin-right: 6px;
  letter-spacing: 0.04em;
}
.verbal-tag-CR { background: var(--duo-purple-bg); color: var(--duo-purple-dark); }
.verbal-tag-SC { background: var(--duo-orange-bg); color: var(--duo-orange-dark); }
.verbal-tag-RC { background: var(--duo-blue-bg);   color: var(--duo-blue-dark); }

/* ============================================================
   Duolingo overhaul additions
   ============================================================ */


/* ─── View toggle (Grid View | Skill Map) ─── */
.view-toggle {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}
.view-toggle-btn {
  font-family: inherit;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 9px 14px;
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-secondary);
  border: 2px solid var(--border);
  border-bottom: 3px solid var(--border-strong);
  cursor: pointer;
  transition: border-color 0.15s var(--easing), background 0.15s var(--easing), color 0.15s var(--easing), transform 0.1s var(--press-easing);
}
.view-toggle-btn:hover {
  border-color: var(--duo-blue);
  border-bottom-color: var(--duo-blue);
  color: var(--duo-blue-dark);
  background: var(--duo-blue-bg);
}
.view-toggle-btn:active { transform: translateY(2px); border-bottom-width: 1px; }
.view-toggle-btn.active {
  border-color: var(--duo-blue);
  border-bottom-color: var(--duo-blue-dark);
  background: var(--duo-blue-bg);
  color: var(--duo-blue-dark);
}

/* ─── Skill map (vertical zigzag node tree) ─── */
.skill-map {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding: 12px 0 40px;
}
.skill-map-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 10px 18px;
  border-radius: 999px;
  margin: 0 auto 18px;
}
.skill-map-header-quant {
  color: var(--duo-blue-dark);
  background: var(--duo-blue-bg);
  border: 2px solid var(--duo-blue);
  border-bottom: 3px solid var(--duo-blue-dark);
}
.skill-map-header-verbal {
  color: var(--duo-purple-dark);
  background: var(--duo-purple-bg);
  border: 2px solid var(--duo-purple);
  border-bottom: 3px solid var(--duo-purple-dark);
}
.skill-map-header-icon { font-size: 18px; }
.skill-map-nodes {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 28px 20px;
  justify-items: center;
}
.sk-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 12px;
  background: transparent;
  border: 0;
  cursor: pointer;
  width: 100%;
  max-width: 180px;
  border-radius: 14px;
  transition: transform 0.12s var(--press-easing);
}
.sk-node:hover { transform: translateY(-2px); }
.sk-node:active { transform: translateY(1px); }
.sk-node-col-0 { justify-self: start; }
.sk-node-col-1 { justify-self: center; }
.sk-node-col-2 { justify-self: end; }

.sk-node-ring {
  position: relative;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sk-node-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 800;
}
.sk-ring-arc { stroke: var(--duo-green); }
.sk-node-good .sk-ring-arc { stroke: var(--duo-green); }
.sk-node-mid  .sk-ring-arc { stroke: var(--duo-yellow); }
.sk-node-low  .sk-ring-arc { stroke: var(--duo-red); }
.sk-node-neutral .sk-ring-arc { stroke: var(--border-strong); }

.sk-locked .sk-node-ring,
.sk-locked .sk-node-label,
.sk-locked .sk-node-meta { opacity: 0.55; filter: grayscale(0.4); }

.sk-node-label {
  font-size: 13px;
  font-weight: 800;
  color: var(--text-primary);
  text-align: center;
  margin-top: 4px;
}
.sk-node-stars { display: inline-flex; gap: 2px; }
.sk-star { font-size: 12px; color: var(--border-strong); }
.sk-star.on { color: var(--duo-yellow); text-shadow: 0 1px 0 var(--duo-yellow-dark); }
.sk-node-meta {
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
}
.sk-verbal .sk-node-label { color: var(--duo-purple-dark); }
.sk-quant .sk-node-label  { color: var(--duo-blue-dark); }

@media (max-width: 600px) {
  .skill-map-nodes { grid-template-columns: 1fr 1fr; }
  .sk-node-col-2 { justify-self: end; }
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Inline feedback (inside question card, shown after answer) ─── */
.feedback-inline {
  margin-top: 16px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid var(--border);
  animation: fadeSlideUp 0.2s var(--easing);
}
.feedback-inline[hidden] { display: none; }
.feedback-inline.correct { border-color: var(--duo-green); background: var(--duo-green-bg); }
.feedback-inline.wrong   { border-color: var(--duo-red);   background: var(--duo-red-bg);   }
.feedback-inline.skipped { border-color: var(--duo-orange);background: var(--duo-orange-bg);}

.feedback-inline-answer {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 16px 8px;
  flex-wrap: wrap;
}
.feedback-inline-label {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.feedback-inline.correct .feedback-inline-label { color: var(--duo-green-dark); }
.feedback-inline.wrong   .feedback-inline-label { color: var(--duo-red-dark); }
.feedback-inline.skipped .feedback-inline-label { color: var(--duo-orange-dark); }
.feedback-inline-answer-text {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-primary);
}
.feedback-inline-explanation {
  padding: 0 16px 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  white-space: pre-wrap;
}
.feedback-inline-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 0 16px 12px;
}
.feedback-inline-actions .btn {
  font-size: 12px;
  padding: 7px 14px;
  border-bottom-width: 3px;
}

@media (max-width: 700px) {
  /* Stack sidebar above question on mobile */
  .practice-layout { flex-direction: column; gap: 12px; }
  .practice-sidebar { width: 100%; position: static; }
  .practice-sidebar .view-toggle { justify-content: flex-start; }
  .filter-col { flex-direction: row; flex-wrap: wrap; gap: 8px; }
  .filter-col .filter-group { flex: 1 1 140px; }
  .filter-col .btn { width: auto; }
}

/* ─── Streak fire effect on header streak counter ─── */
.streak-fire {
  animation: streakFire 0.9s var(--easing);
  display: inline-block;
}
@keyframes streakFire {
  0%   { transform: scale(1); text-shadow: 0 0 0 transparent; color: inherit; }
  20%  { transform: scale(1.4); text-shadow: 0 0 14px var(--duo-orange), 0 0 28px var(--duo-yellow); color: var(--duo-orange-dark); }
  60%  { transform: scale(1.15); text-shadow: 0 0 10px var(--duo-orange), 0 0 18px var(--duo-yellow); color: var(--duo-orange-dark); }
  100% { transform: scale(1); text-shadow: 0 0 0 transparent; color: inherit; }
}

/* ─── Streak fire glow on question card when streak ≥ 5 ─── */
#question-card.streak-active {
  box-shadow: 0 0 0 3px rgba(255, 150, 0, 0.5), var(--shadow-card);
  border-top-color: #FF9600;
  transition: box-shadow 0.3s ease;
}

/* ─── Heart-break animation on wrong answer ─── */
.heart-break {
  animation: heartBreak 0.6s var(--easing);
}
@keyframes heartBreak {
  0%   { transform: scale(1);    filter: none; }
  30%  { transform: scale(1.18); filter: drop-shadow(0 0 8px var(--duo-red)); }
  60%  { transform: scale(0.85); filter: brightness(0.85); }
  100% { transform: scale(1);    filter: none; }
}

/* ─── Quill the Owl Mascot ─── */
.quill-wrap {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9500;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  pointer-events: none;
}
.quill-wrap > * { pointer-events: auto; }

.quill-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  filter: drop-shadow(0 6px 16px rgba(0,0,0,0.22));
  animation: quillFloat 3s ease-in-out infinite;
  transition: transform 0.15s var(--easing);
}
.quill-btn:hover { transform: scale(1.08); animation-play-state: paused; }
.quill-btn:active { transform: scale(0.94); }

.quill-svg {
  width: 72px;
  height: 86px;
  display: block;
}

/* Cat tail wag animation */
.cat-tail {
  transform-origin: 68px 95px;
  animation: catTailWag 1.8s ease-in-out infinite;
}
@keyframes catTailWag {
  0%, 100% { transform: rotate(0deg); }
  25%       { transform: rotate(12deg); }
  75%       { transform: rotate(-10deg); }
}

/* Mood overlay classes toggled by JS */
.quill-svg.mood-happy  #quill-eyes-open { display: none; }
.quill-svg.mood-happy  #quill-eyes-happy { display: block; }
.quill-svg.mood-sad    #quill-eyes-open { display: none; }
.quill-svg.mood-sad    #quill-eyes-sad  { display: block; }
.quill-svg.mood-think  #quill-eyes-open { display: none; }
.quill-svg.mood-think  #quill-eyes-think { display: block; }

/* Speech bubble */
.quill-bubble {
  background: var(--surface);
  border: 2px solid var(--border-strong);
  border-radius: 16px;
  padding: 10px 14px;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  max-width: 200px;
  line-height: 1.4;
  box-shadow: var(--shadow);
  position: relative;
  animation: bubblePop 0.25s var(--easing);
}
.quill-bubble-tail {
  position: absolute;
  bottom: -10px;
  right: 24px;
  width: 0; height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 10px solid var(--border-strong);
}
.quill-bubble-tail::after {
  content: '';
  position: absolute;
  top: -12px;
  left: -6px;
  width: 0; height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 9px solid var(--surface);
}

/* Animations */
@keyframes quillFloat {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-8px); }
}
@keyframes quillBounce {
  0%   { transform: scale(1) rotate(0deg); }
  20%  { transform: scale(1.2) rotate(-8deg); }
  40%  { transform: scale(1.2) rotate(8deg); }
  60%  { transform: scale(1.1) rotate(-4deg); }
  80%  { transform: scale(1.05) rotate(2deg); }
  100% { transform: scale(1) rotate(0deg); }
}
@keyframes quillShake {
  0%, 100% { transform: rotate(0deg); }
  20%      { transform: rotate(-12deg); }
  40%      { transform: rotate(10deg); }
  60%      { transform: rotate(-8deg); }
  80%      { transform: rotate(6deg); }
}
@keyframes quillSpin {
  0%   { transform: rotateY(0deg); }
  50%  { transform: rotateY(180deg); }
  100% { transform: rotateY(360deg); }
}
@keyframes bubblePop {
  0%   { transform: scale(0.7); opacity: 0; }
  60%  { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}

.quill-btn.anim-bounce { animation: quillBounce 0.6s var(--easing); }
.quill-btn.anim-shake  { animation: quillShake 0.5s var(--easing); }
.quill-btn.anim-spin   { animation: quillSpin 0.7s ease-in-out; }

/* Hide on mobile if not enough space */
@media (max-width: 480px) {
  .quill-wrap { bottom: 80px; right: 12px; }
  .quill-svg { width: 56px; height: 67px; }
  .quill-bubble { max-width: 160px; font-size: 12px; }
  .toast-container { left: 12px; right: auto; } /* bottom-left on mobile too */
}

/* ════════════════════════════════════════════════
   GMAT Focus Trainer — New Components (v3)
   ════════════════════════════════════════════════ */

/* ─── GMAT Score Badge (header) ─── */
.gmat-score-badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  border-radius: 10px;
  background: linear-gradient(135deg, #1A2034 0%, #2A3448 100%);
  border: 2px solid #4A5568;
  box-shadow: 0 2px 0 #0E1220;
  min-width: 72px;
  transition: all 0.2s var(--easing);
}
[data-theme="light"] .gmat-score-badge {
  background: linear-gradient(135deg, #1e3a5f 0%, #1a4980 100%);
  border-color: #1CB0F6;
  box-shadow: 0 2px 0 #0E8BBF;
}
.gmat-score-label {
  font-size: 9px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.65);
}
.gmat-score-value {
  font-size: 16px;
  font-weight: 900;
  color: #FFC800;
  font-family: 'JetBrains Mono', monospace;
  line-height: 1;
  margin-top: 1px;
}
.gmat-score-value.score-excellent { color: #58CC02; }
.gmat-score-value.score-good      { color: #1CB0F6; }
.gmat-score-value.score-fair      { color: #FF9600; }
.gmat-score-value.score-low       { color: #FF4B4B; }

/* ─── Score Predictor Card (dashboard) ─── */
.score-predictor-card {
  background: linear-gradient(135deg, #0E1220 0%, #1A2034 60%, #1e2a48 100%);
  border: 2px solid #2A3448;
  border-radius: var(--radius-xl);
  padding: 22px 26px;
  margin-bottom: 24px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.35), 0 4px 0 #070B14;
  position: relative;
  overflow: hidden;
}
.score-predictor-card::before {
  content: '';
  position: absolute;
  top: -30px; right: -30px;
  width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(28,176,246,0.15) 0%, transparent 70%);
  pointer-events: none;
}
[data-theme="light"] .score-predictor-card {
  background: linear-gradient(135deg, #1e3a5f 0%, #1a4980 100%);
  border-color: #1CB0F6;
  box-shadow: 0 8px 32px rgba(28,176,246,0.2), 0 4px 0 #0E8BBF;
}
.score-predictor-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}
.score-predictor-title {
  font-size: 14px;
  font-weight: 800;
  color: rgba(255,255,255,0.9);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.score-predictor-info {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.5);
  font-size: 11px;
  display: flex; align-items: center; justify-content: center;
  cursor: help;
  flex-shrink: 0;
}
.score-predictor-main {
  display: flex;
  gap: 28px;
  align-items: center;
}
.score-total-wrap {
  text-align: center;
  flex-shrink: 0;
  min-width: 90px;
}
.score-total-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.5);
  margin-bottom: 4px;
}
.score-total-value {
  font-size: 48px;
  font-weight: 900;
  color: #FFC800;
  font-family: 'JetBrains Mono', monospace;
  line-height: 1;
  text-shadow: 0 0 20px rgba(255,200,0,0.4);
  transition: all 0.4s var(--easing);
}
.score-total-value.score-excellent { color: #58CC02; text-shadow: 0 0 20px rgba(88,204,2,0.4); }
.score-total-value.score-good      { color: #1CB0F6; text-shadow: 0 0 20px rgba(28,176,246,0.4); }
.score-total-range {
  font-size: 10px;
  color: rgba(255,255,255,0.3);
  font-family: 'JetBrains Mono', monospace;
  margin-top: 4px;
}
.score-sections {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.score-section {
  display: flex;
  align-items: center;
  gap: 8px;
}
.score-section-icon { font-size: 14px; flex-shrink: 0; width: 20px; text-align: center; }
.score-section-name {
  font-size: 11px;
  font-weight: 700;
  color: rgba(255,255,255,0.6);
  width: 90px;
  flex-shrink: 0;
}
.score-section-val {
  font-size: 14px;
  font-weight: 800;
  color: white;
  font-family: 'JetBrains Mono', monospace;
  width: 28px;
  text-align: right;
  flex-shrink: 0;
}
.score-section-bar {
  flex: 1;
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 999px;
  overflow: hidden;
}
.score-section-bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.6s var(--easing);
  background: var(--duo-blue);
}
.score-section-bar-fill--blue   { background: linear-gradient(90deg, #1CB0F6, #0E8BBF); }
.score-section-bar-fill--purple { background: linear-gradient(90deg, #CE82FF, #8549BA); }
.score-section-bar-fill--orange { background: linear-gradient(90deg, #FF9600, #CC7A00); }
.score-predictor-note {
  margin-top: 14px;
  font-size: 11px;
  color: rgba(255,255,255,0.35);
  text-align: center;
  font-style: italic;
}

/* ─── Study Plan Tab ─── */
.plan-hero {
  text-align: center;
  padding: 32px 24px 20px;
  margin-bottom: 24px;
}
.plan-hero-icon { font-size: 48px; margin-bottom: 8px; }
.plan-hero-title {
  font-size: 28px;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.plan-hero-sub {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 600;
}
.plan-score-forecast {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 28px;
}
.plan-forecast-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-bottom: 4px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 20px 32px;
  text-align: center;
  min-width: 140px;
}
.plan-forecast-card--target {
  border-color: var(--duo-green);
  border-bottom-color: var(--duo-green-dark);
  background: var(--duo-green-bg);
}
.plan-forecast-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.plan-forecast-score {
  font-size: 40px;
  font-weight: 900;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
}
.plan-forecast-score--green { color: var(--duo-green-dark); }
.plan-forecast-score--low { color: var(--duo-red); }
.plan-forecast-card--projection {
  border-color: #6366f1;
  border-bottom-color: #4f46e5;
  background: #eef2ff;
}
[data-theme="dark"] .plan-forecast-card--projection {
  background: #1e1b4b;
  border-color: #818cf8;
}
.plan-forecast-sub {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 4px;
  font-weight: 600;
}
.plan-forecast-arrow {
  font-size: 24px;
  color: var(--text-muted);
  font-weight: 700;
}
.plan-section-scores {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}
.plan-section-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  text-align: center;
}
.plan-section-icon { font-size: 24px; margin-bottom: 6px; }
.plan-section-name {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.plan-section-score {
  font-size: 32px;
  font-weight: 900;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 10px;
}
.plan-section-bar {
  height: 8px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 6px;
}
.plan-section-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--duo-blue);
  transition: width 0.6s var(--easing);
}
.plan-section-bar-fill--purple { background: var(--duo-purple); }
.plan-section-bar-fill--orange { background: var(--duo-orange); }
.plan-section-range {
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 600;
}

/* ─── Plan weeks grid ─── */
.plan-weeks {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.plan-week-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
}
.plan-week-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.plan-week-number {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--duo-blue);
  color: white;
  font-size: 14px;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.plan-week-title {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-primary);
}
.plan-week-focus {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
}
.plan-week-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.plan-topic-chip {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  background: var(--duo-blue-bg);
  border: 1px solid var(--duo-blue);
  color: var(--duo-blue-dark);
}
.plan-topic-chip--weak {
  background: var(--duo-red-bg);
  border-color: var(--duo-red);
  color: var(--duo-red-dark);
}
.plan-topic-chip--strong {
  background: var(--duo-green-bg);
  border-color: var(--duo-green);
  color: var(--duo-green-dark);
}

/* ─── Daily recommendations ─── */
.plan-daily {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.plan-daily-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
}
.plan-daily-icon { font-size: 24px; flex-shrink: 0; }
.plan-daily-text { flex: 1; }
.plan-daily-title { font-size: 14px; font-weight: 800; color: var(--text-primary); }
.plan-daily-desc  { font-size: 12px; color: var(--text-secondary); font-weight: 600; margin-top: 2px; }
.plan-daily-action .btn { font-size: 11px; padding: 8px 14px; border-bottom-width: 3px; }

/* ─── Section accent on question card ─── */
.question-card[data-section="Quant"] {
  border-top: 4px solid var(--duo-blue);
}
.question-card[data-section="Verbal"] {
  border-top: 4px solid var(--duo-purple);
}
.question-card[data-section="Data Insights"] {
  border-top: 4px solid var(--duo-orange);
}

/* ─── TPA question type ─── */
.tpa-note {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  font-style: italic;
  margin-bottom: 14px;
  padding: 8px 12px;
  background: var(--duo-blue-bg);
  border: 1px solid var(--duo-blue);
  border-radius: var(--radius-sm);
}
.badge-type[data-type="TPA"] { color: var(--duo-orange-dark); border-color: var(--duo-orange); background: var(--duo-orange-bg); }
.badge-type[data-type="TA"]  { color: var(--duo-green-dark);  border-color: var(--duo-green);  background: var(--duo-green-bg); }
.badge-type[data-type="GI"]  { color: var(--duo-purple-dark); border-color: var(--duo-purple); background: var(--duo-purple-bg); }
.badge-type[data-type="MSR"] { color: var(--duo-yellow-dark); border-color: var(--duo-yellow); background: var(--duo-yellow-bg); }
.badge-section {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge-section--quant { background: var(--duo-blue-bg); border: 1px solid var(--duo-blue); color: var(--duo-blue-dark); }
.badge-section--verbal { background: var(--duo-purple-bg); border: 1px solid var(--duo-purple); color: var(--duo-purple-dark); }
.badge-section--di { background: var(--duo-orange-bg); border: 1px solid var(--duo-orange); color: var(--duo-orange-dark); }

/* ─── Improved feedback panel ─── */
.feedback-inline {
  animation: feedbackSlideIn 0.25s var(--easing);
}
@keyframes feedbackSlideIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.feedback-inline.correct-feedback {
  background: var(--duo-green-bg);
  border: 2px solid var(--duo-green);
  border-radius: var(--radius);
  padding: 14px 18px;
}
.feedback-inline.wrong-feedback {
  background: var(--duo-red-bg);
  border: 2px solid var(--duo-red);
  border-radius: var(--radius);
  padding: 14px 18px;
}

/* ─── DI section badge on question card ─── */
.badge-adaptive[data-level="easy"]   { background: var(--duo-green-bg); border-color: var(--duo-green); color: var(--duo-green-dark); }
.badge-adaptive[data-level="medium"] { background: var(--duo-blue-bg); border-color: var(--duo-blue); color: var(--duo-blue-dark); }
.badge-adaptive[data-level="hard"]   { background: var(--duo-red-bg); border-color: var(--duo-red); color: var(--duo-red-dark); }

/* ─── Improved session tracker ─── */
.session-tracker {
  transition: box-shadow 0.2s var(--easing);
}
.session-tracker:hover {
  box-shadow: var(--shadow);
}

/* ─── Score animate pulse ─── */
@keyframes scorePulse {
  0%   { transform: scale(1); }
  30%  { transform: scale(1.08); }
  100% { transform: scale(1); }
}
.score-total-value.animate {
  animation: scorePulse 0.4s var(--easing);
}

/* ─── Responsive: plan section scores on mobile ─── */
@media (max-width: 600px) {
  .plan-section-scores { grid-template-columns: 1fr; }
  .plan-weeks { grid-template-columns: 1fr; }
  .plan-score-forecast { flex-direction: column; }
  .score-predictor-main { flex-direction: column; }
  .score-total-value { font-size: 36px; }
}

/* ─── DI question type context banners ─── */
.di-type-context {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
  margin-top: 4px;
}
.di-tpa  { background: rgba(255,150,0,0.15); color: #FF9600; border: 1px solid rgba(255,150,0,0.3); }
.di-ta   { background: rgba(88,204,2,0.15);  color: #45a800; border: 1px solid rgba(88,204,2,0.3); }
.di-gi   { background: rgba(206,130,255,0.15); color: #9f4fe0; border: 1px solid rgba(206,130,255,0.3); }
.di-msr  { background: rgba(255,200,0,0.15); color: #b38f00; border: 1px solid rgba(255,200,0,0.3); }

[data-theme="dark"] .di-tpa  { color: #FF9600; }
[data-theme="dark"] .di-ta   { color: #58CC02; }
[data-theme="dark"] .di-gi   { color: #CE82FF; }
[data-theme="dark"] .di-msr  { color: #FFC800; }

/* ─── Score color classes ─── */
.score-total-value.score-elite { color: #58CC02; }
.score-total-value.score-good  { color: #1CB0F6; }
.score-total-value.score-low   { color: #FF9600; }

/* ─── Study Plan week card variants ─── */
.plan-week-1 { border-left: 4px solid #1CB0F6; }
.plan-week-2 { border-left: 4px solid #CE82FF; }
.plan-week-3 { border-left: 4px solid #FF9600; }
.plan-week-4 { border-left: 4px solid #FF4B4B; }

/* ── Priority Queue ─────────────────────────── */
.plan-queue-desc { font-size: 13px; color: var(--text-secondary); margin: 0 0 12px; }
.priority-q-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.priority-q-row:last-child { border-bottom: none; }
.priority-q-badge {
  font-size: 10px;
  font-weight: 800;
  padding: 2px 7px;
  border-radius: 20px;
  flex-shrink: 0;
}
.priority-q-unseen { background: #dbeafe; color: #1d4ed8; }
.priority-q-wrong  { background: #fee2e2; color: #b91c1c; }
.priority-q-type {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  color: #6366f1;
  min-width: 36px;
}
.priority-q-topic { flex: 1; color: var(--text-primary); font-weight: 600; }
.priority-q-diff { font-size: 11px; font-weight: 700; text-transform: capitalize; padding: 1px 6px; border-radius: 4px; }

/* ── Coverage bars ─────────────────────────── */
.coverage-row {
  display: grid;
  grid-template-columns: 120px 1fr 90px;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.coverage-label { font-size: 13px; font-weight: 700; color: var(--text-primary); }
.coverage-track {
  height: 10px;
  background: var(--bg-secondary);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.coverage-fill {
  height: 100%;
  border-radius: 99px;
  transition: width .4s ease;
}
.coverage-fill--green  { background: linear-gradient(90deg, #22c55e, #16a34a); }
.coverage-fill--yellow { background: linear-gradient(90deg, #fbbf24, #d97706); }
.coverage-fill--red    { background: linear-gradient(90deg, #f87171, #dc2626); }
.coverage-pct { font-size: 12px; font-weight: 700; color: var(--text-secondary); text-align: right; }

/* ── Difficulty Felt Rating ──────────────────── */
.difficulty-rating-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 0 2px;
  flex-wrap: wrap;
}
.difficulty-rating-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.diff-rate-btn {
  background: none;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 18px;
  padding: 2px 4px;
  border-radius: 8px;
  transition: transform .15s, border-color .15s;
  line-height: 1;
}
.diff-rate-btn:hover { transform: scale(1.25); border-color: rgba(99,102,241,.4); }
.diff-rate-btn.active { border-color: #6366f1; background: rgba(99,102,241,.1); transform: scale(1.2); }

/* ─── Confidence Tags ─── */
.confidence-tag-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0 4px;
  flex-wrap: wrap;
}
.confidence-tag-label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.confidence-btn {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  background: var(--surface);
}
.confidence-btn.confidence-sure   { border-color: #58CC02; color: #45a800; }
.confidence-btn.confidence-unsure { border-color: #FF9600; color: #cc7a00; }
.confidence-btn.confidence-guessed{ border-color: #FF4B4B; color: #cc2222; }
.confidence-btn:hover { transform: translateY(-1px); filter: brightness(1.1); }
.confidence-btn.active.confidence-sure   { background: #58CC02; color: #fff; }
.confidence-btn.active.confidence-unsure { background: #FF9600; color: #fff; }
.confidence-btn.active.confidence-guessed{ background: #FF4B4B; color: #fff; }
[data-theme="dark"] .confidence-btn { background: var(--card-bg); }
[data-theme="dark"] .confidence-btn.confidence-sure   { border-color: #58CC02; color: #58CC02; }
[data-theme="dark"] .confidence-btn.confidence-unsure { border-color: #FF9600; color: #FF9600; }
[data-theme="dark"] .confidence-btn.confidence-guessed{ border-color: #FF4B4B; color: #FF4B4B; }

/* ─── Confidence stat on dashboard ─── */
.confidence-stats-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 0 4px;
}
.conf-stat-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
}
.conf-stat-chip.conf-sure   { background: rgba(88,204,2,0.12); color: #45a800; }
.conf-stat-chip.conf-unsure { background: rgba(255,150,0,0.12); color: #cc7a00; }
.conf-stat-chip.conf-guessed{ background: rgba(255,75,75,0.12); color: #cc2222; }
[data-theme="dark"] .conf-stat-chip.conf-sure   { background: rgba(88,204,2,0.2);  color: #58CC02; }
[data-theme="dark"] .conf-stat-chip.conf-unsure { background: rgba(255,150,0,0.2); color: #FF9600; }
[data-theme="dark"] .conf-stat-chip.conf-guessed{ background: rgba(255,75,75,0.2); color: #FF4B4B; }

/* ─── Confidence badge in review list ─── */
.conf-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  margin-left: 6px;
}
.conf-badge.conf-sure    { background: rgba(88,204,2,0.15); color: #45a800; }
.conf-badge.conf-unsure  { background: rgba(255,150,0,0.15); color: #cc7a00; }
.conf-badge.conf-guessed { background: rgba(255,75,75,0.15); color: #cc2222; }
[data-theme="dark"] .conf-badge.conf-sure    { background: rgba(88,204,2,0.25); color: #58CC02; }
[data-theme="dark"] .conf-badge.conf-unsure  { background: rgba(255,150,0,0.25); color: #FF9600; }
[data-theme="dark"] .conf-badge.conf-guessed { background: rgba(255,75,75,0.25); color: #FF4B4B; }

/* ─── Challenge Mode timer countdown ─── */
.q-timer.over .q-timer-value {
  animation: timer-pulse 0.6s ease-in-out infinite;
}
@keyframes timer-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.feedback-inline.timeout {
  background: linear-gradient(135deg, rgba(255,75,75,0.08), rgba(255,75,75,0.04));
  border-left: 4px solid #FF4B4B;
}
.feedback-inline-label[data-timeout="true"],
.feedback-inline.timeout .feedback-inline-label {
  color: #FF4B4B;
}

/* ─── Time Analytics ─── */
.time-analytics-row {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border-color);
}
.time-analytics-row:last-child { border-bottom: none; }
.time-analytics-type {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}
.time-analytics-bar-wrap {
  position: relative;
  height: 8px;
  background: var(--surface);
  border-radius: 4px;
  overflow: visible;
}
.time-analytics-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.4s ease;
  max-width: 100%;
}
.time-analytics-bar.fast      { background: #58CC02; }
.time-analytics-bar.on-target { background: #FFC800; }
.time-analytics-bar.slow      { background: #FF4B4B; }
.time-analytics-target-line {
  position: absolute;
  top: -3px;
  left: 100%;
  width: 2px;
  height: 14px;
  background: var(--text-tertiary);
  border-radius: 1px;
  transform: translateX(-50%);
}
.time-analytics-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  min-width: 80px;
}
.time-analytics-target {
  font-size: 11px;
  font-weight: 400;
  color: var(--text-secondary);
}
.empty-state-msg {
  color: var(--text-secondary);
  font-size: 14px;
  padding: 8px 0;
}

/* ─── Exam Simulation Modal ─── */
.exam-setup-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}
.exam-setup-row:last-of-type { border-bottom: none; }
.exam-label {
  font-weight: 700;
  font-size: 14px;
  min-width: 90px;
  color: var(--text-primary);
}
.exam-setup-row select {
  flex: 1;
  padding: 8px 12px;
  border-radius: 8px;
  border: 2px solid var(--border-color);
  background: var(--surface);
  color: var(--text-primary);
  font-size: 14px;
}
.exam-time-preview {
  margin-top: 12px;
  padding: 10px 16px;
  background: var(--surface);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  text-align: center;
}
.exam-modal-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}
.exam-mode-btn {
  background: linear-gradient(135deg, #CE82FF, #9B4FCC) !important;
  border-color: transparent !important;
  color: #fff !important;
}
.exam-mode-btn:hover { filter: brightness(1.1); }
.exam-results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 8px 0;
}
.exam-result-stat {
  text-align: center;
  padding: 16px 8px;
  background: var(--surface);
  border-radius: 12px;
}
.exam-result-val {
  font-size: 28px;
  font-weight: 900;
  color: var(--duo-green);
  line-height: 1;
}
.exam-result-lbl {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
/* Hide gamification elements during exam */
body.exam-in-progress .hearts-display,
body.exam-in-progress .xp-bar,
body.exam-in-progress .level-badge,
body.exam-in-progress .combo-badge {
  opacity: 0.3;
  pointer-events: none;
}

/* ── Keyboard shortcuts hint ─── */
.kbd-shortcuts-hint {
  font-size: 11px;
  color: var(--text-secondary);
  text-align: center;
  padding: 6px 0 2px;
  opacity: 0.7;
  user-select: none;
}
.kbd-shortcuts-hint kbd {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0px 5px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0;
  line-height: 1.6;
}

/* ── Section Accuracy Rings ─── */
.section-rings-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  padding: 20px 0 8px;
  flex-wrap: wrap;
}
.section-ring-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 18px;
  padding: 18px 24px 14px;
  min-width: 120px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.2s, box-shadow 0.2s;
}
.section-ring-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}
.ring-svg { flex-shrink: 0; }
.ring-bg { stroke: var(--border); }
.ring-fill { transition: stroke-dashoffset 1s cubic-bezier(.4,0,.2,1); }
.ring-fill--quant  { stroke: var(--duo-blue,  #1cb0f6); }
.ring-fill--verbal { stroke: var(--duo-purple, #9b59b6); }
.ring-fill--di     { stroke: var(--duo-orange, #ff9600); }
.ring-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}
.ring-pct {
  font-size: 22px;
  font-weight: 900;
  color: var(--text);
  line-height: 1;
}
.ring-sub {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 600;
}

/* ── Dashboard two-column layout ─── */
.dash-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 680px) {
  .dash-two-col { grid-template-columns: 1fr; }
}

/* ── Strength card (mirrors weakness-card) ─── */
.strength-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border: 1.5px solid var(--duo-green, #58cc02);
  border-radius: 14px;
  padding: 12px 16px;
  margin-bottom: 10px;
}
.strength-card-info { flex: 1; }
.strength-card-topic { font-weight: 700; font-size: 14px; color: var(--text); }
.strength-card-stat  { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }
.strength-pct {
  font-size: 20px;
  font-weight: 900;
  color: var(--duo-green, #58cc02);
  margin-left: 12px;
}
.strength-radar-empty {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
  padding: 20px 0;
}

/* ── Mobile Responsive Enhancements ─── */
@media (max-width: 520px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 12px;
  }
  .header-stats {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 6px;
  }
  .brand-title { font-size: 16px; }
  .brand-sub { font-size: 11px; }
  .brand-title-row { flex-wrap: wrap; gap: 6px; }

  .tab-nav { padding: 0 4px; gap: 2px; }
  .tab-btn { padding: 8px 10px; font-size: 12px; }

  .question-card { padding: 14px 12px; border-radius: 16px; }
  .choice { padding: 10px 12px; font-size: 13px; }
  .choice-letter { width: 24px; height: 24px; font-size: 12px; }

  .qcard-actions { gap: 6px; }
  .btn { padding: 10px 14px; font-size: 13px; }

  .kbd-shortcuts-hint { display: none; }

  .section-rings-row { gap: 10px; }
  .section-ring-card { padding: 12px 14px; min-width: 90px; }
  .ring-pct { font-size: 18px; }

  .dashboard-grid { grid-template-columns: 1fr 1fr; }
  .dash-card.big { grid-column: span 2; }

  .dash-two-col { grid-template-columns: 1fr; }

  .formula-sheet { grid-template-columns: 1fr; }
  .modal-card--wide { height: 95vh; width: 98vw; }

  .score-sections { gap: 12px; }
  .score-section { min-width: 70px; }
}

/* ── Weekly Streak Calendar ─── */
.streak-calendar-card {
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: 16px;
  padding: 14px 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
}
.streak-calendar-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 10px;
}
.streak-calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}
.streak-cal-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 2px;
  border-radius: 8px;
  cursor: default;
  transition: transform 0.1s;
  position: relative;
}
.streak-cal-cell:hover { transform: scale(1.1); z-index: 1; }
.streak-cal-cell--0 { background: var(--border); }
.streak-cal-cell--1 { background: #bbf7d0; }
.streak-cal-cell--2 { background: #4ade80; }
.streak-cal-cell--3 { background: #16a34a; }
.streak-cal-cell--4 { background: #14532d; }
[data-theme="dark"] .streak-cal-cell--0 { background: #1a1a1a; }
[data-theme="dark"] .streak-cal-cell--1 { background: #14532d; }
[data-theme="dark"] .streak-cal-cell--2 { background: #15803d; }
[data-theme="dark"] .streak-cal-cell--3 { background: #16a34a; }
[data-theme="dark"] .streak-cal-cell--4 { background: #22c55e; }
.streak-cal-cell--today { outline: 2px solid #6366f1; outline-offset: 1px; }
.streak-cal-day { font-size: 9px; font-weight: 700; color: var(--text-secondary); line-height: 1; }
.streak-cal-num { font-size: 11px; font-weight: 700; color: var(--text-primary); }
.streak-cal-count { font-size: 9px; color: var(--text-secondary); font-weight: 600; }
.streak-cal-cell--1 .streak-cal-num,
.streak-cal-cell--1 .streak-cal-day { color: #14532d; }
.streak-cal-cell--2 .streak-cal-num,
.streak-cal-cell--2 .streak-cal-day { color: #052e16; }
.streak-cal-cell--3 .streak-cal-num,
.streak-cal-cell--3 .streak-cal-day { color: #fff; }
.streak-cal-cell--4 .streak-cal-num,
.streak-cal-cell--4 .streak-cal-day { color: #fff; }

@media (max-width: 520px) {
  .streak-calendar-grid { grid-template-columns: repeat(7, 1fr); }
}

/* ── Quick-filter chips ─── */
.quick-filter-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.qf-chip {
  border: none;
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  box-shadow: 0 2px 0 rgba(0,0,0,0.15);
}
.qf-chip:hover { transform: translateY(-1px); box-shadow: 0 3px 0 rgba(0,0,0,0.2); }
.qf-chip:active { transform: translateY(1px); box-shadow: none; }
.qf-chip--weak   { background: #fef3c7; color: #92400e; }
.qf-chip--unseen { background: #ddf4ff; color: #0c4a6e; }
.qf-chip--hard   { background: #ffe0e0; color: #7f1d1d; }
.qf-chip--sr     { background: #f0fdf4; color: #14532d; }
[data-theme="dark"] .qf-chip--weak   { background: #292005; color: #fbbf24; }
[data-theme="dark"] .qf-chip--unseen { background: #0c2a3a; color: #7dd3fc; }
[data-theme="dark"] .qf-chip--hard   { background: #2a0808; color: #fca5a5; }
[data-theme="dark"] .qf-chip--sr     { background: #052e16; color: #86efac; }

/* ── Error Tag Row ─── */
.error-tag-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0 4px 0;
  flex-wrap: wrap;
}
.error-tag-label {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  white-space: nowrap;
}
.error-tag-btn {
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  font-family: 'Nunito', sans-serif;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  color: var(--text-primary);
}
.error-tag-btn:hover { border-color: #ef4444; }
.error-tag-btn.active { background: #fff1f1; border-color: #ef4444; color: #b91c1c; }
[data-theme="dark"] .error-tag-btn.active { background: #2a0808; color: #fca5a5; border-color: #991b1b; }

/* ── Error Patterns ─── */
.error-pattern-section { margin-bottom: 20px; }
.error-pattern-row {
  display: grid;
  grid-template-columns: 120px 1fr 70px 80px;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.error-pattern-row:last-child { border-bottom: none; }
.error-pattern-label { font-weight: 700; color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.error-pattern-bar-wrap { height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.error-pattern-bar { height: 100%; background: #ef4444; border-radius: 4px; transition: width 0.4s ease; }
.error-pattern-count { font-weight: 700; color: #ef4444; text-align: right; }
.error-pattern-types { color: var(--text-secondary); font-size: 10px; }
.error-type-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.error-type-chip { display: flex; align-items: center; gap: 4px; background: var(--card-bg); border: 1.5px solid var(--border); border-radius: 10px; padding: 4px 10px; font-size: 12px; }
.error-type-chip-type { font-weight: 700; color: var(--text-primary); }
.error-type-chip-count { font-weight: 600; color: #ef4444; }
.error-advice { margin-top: 8px; }
.error-advice-item { font-size: 13px; padding: 8px 0; border-bottom: 1px solid var(--border); color: var(--text-primary); line-height: 1.5; }
.error-advice-item:last-child { border-bottom: none; }

/* ── Weak topic badge indicator ─── */
.badge-topic--weak {
  background: #fff3f3 !important;
  color: var(--duo-red) !important;
  border-color: #fca5a5 !important;
}
[data-theme="dark"] .badge-topic--weak {
  background: #2a0a0a !important;
  color: #f87171 !important;
  border-color: #7f1d1d !important;
}

/* ── Focus Nudge ─── */
.focus-nudge {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fefce8;
  border: 1.5px solid #fde68a;
  border-radius: 12px;
  padding: 10px 14px;
  margin-bottom: 10px;
  font-size: 13px;
  animation: nudge-slide-in 0.3s ease;
}
[data-theme="dark"] .focus-nudge {
  background: #2d2a1a;
  border-color: #92400e55;
}
@keyframes nudge-slide-in {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.focus-nudge-icon { font-size: 18px; flex-shrink: 0; }
.focus-nudge-text { flex: 1; color: var(--text-primary); font-weight: 600; line-height: 1.4; }
.focus-nudge-btn {
  background: var(--duo-yellow);
  color: #000;
  border: none;
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}
.focus-nudge-btn:hover { background: var(--duo-yellow-dark); }
.focus-nudge-dismiss {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  flex-shrink: 0;
}
.focus-nudge-dismiss:hover { color: var(--text-primary); }

/* ── Exam Countdown Card ─── */
.exam-countdown-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: 18px;
  padding: 20px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-card);
}
.exam-countdown-left {
  text-align: center;
  min-width: 90px;
}
.exam-countdown-days {
  font-size: 42px;
  font-weight: 900;
  color: var(--duo-indigo, #6366f1);
  line-height: 1;
}
.exam-countdown-label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  margin-top: 2px;
}
.exam-urgency-bar {
  height: 4px;
  border-radius: 2px;
  margin-top: 8px;
  background: var(--border);
  transition: background 0.3s;
}
.exam-urgency-bar.exam-urgency--green  { background: var(--duo-green); }
.exam-urgency-bar.exam-urgency--yellow { background: var(--duo-yellow); }
.exam-urgency-bar.exam-urgency--red    { background: var(--duo-red); }
.exam-urgency-bar.exam-urgency--past   { background: var(--text-secondary); }
.exam-countdown-right { flex: 1; }
.exam-countdown-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.exam-date-row {
  display: flex;
  gap: 8px;
  align-items: center;
}
.exam-date-input {
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 7px 10px;
  font-size: 13px;
  font-family: 'Nunito', sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  flex: 1;
  max-width: 180px;
}
.exam-date-input:focus { outline: none; border-color: #6366f1; }
.exam-daily-rec {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 8px;
  line-height: 1.4;
}

[data-theme="dark"] .exam-date-input {
  background: var(--bg-main);
  color: var(--text-primary);
  border-color: var(--border);
}

/* ── Score Momentum ─── */
.momentum-row {
  margin: 0 0 14px 0;
}
.momentum-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  border-radius: 14px;
  border: 1.5px solid var(--border);
  background: var(--card-bg);
}
.momentum-card.momentum--up   { border-color: #22c55e33; background: #f0fdf4; }
.momentum-card.momentum--down { border-color: #ef444433; background: #fff1f1; }
.momentum-card.momentum--flat { border-color: var(--border); }
[data-theme="dark"] .momentum-card.momentum--up   { background: #052e16; }
[data-theme="dark"] .momentum-card.momentum--down { background: #2a0a0a; }
.momentum-arrow {
  font-size: 26px;
  font-weight: 900;
  min-width: 28px;
  text-align: center;
}
.momentum--up   .momentum-arrow { color: #22c55e; }
.momentum--down .momentum-arrow { color: #ef4444; }
.momentum--flat .momentum-arrow { color: var(--text-secondary); }
.momentum-info { flex: 1; }
.momentum-trend {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}
.momentum-detail {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}
.momentum-pct {
  font-size: 22px;
  font-weight: 900;
}
.momentum--up   .momentum-pct { color: #22c55e; }
.momentum--down .momentum-pct { color: #ef4444; }
.momentum--flat .momentum-pct { color: var(--text-secondary); }

/* ─── Weekly Schedule Grid ───────────────────────── */
.week-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}
.week-grid-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 4px;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--surface);
  text-align: center;
  font-size: 11px;
}
.week-day--today {
  border-color: var(--duo-blue);
  background: var(--duo-blue-bg);
}
.week-day--done {
  border-color: var(--duo-green);
  background: var(--duo-green-bg);
}
.week-day--missed {
  border-color: var(--duo-red);
  opacity: 0.55;
}
.week-day-name {
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 10px;
  text-transform: uppercase;
}
.week-day-date {
  font-weight: 900;
  font-size: 16px;
  color: var(--text-primary);
}
.week-day-section {
  font-size: 9px;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 4px;
  background: var(--surface-soft);
  color: var(--text-secondary);
}
.week-day-topic {
  font-size: 9px;
  color: var(--text-secondary);
  line-height: 1.2;
}
.week-day-count {
  font-weight: 700;
  font-size: 12px;
  color: var(--text-primary);
}
@media (max-width: 500px) {
  .week-grid { grid-template-columns: repeat(7, 1fr); gap: 3px; }
  .week-day-topic { display: none; }
}

/* ─── Section Balance Bar ────────────────────────── */
.balance-bars {
  display: flex;
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 4px;
}
.balance-bar { height: 100%; transition: width 0.4s ease; }
.balance-bar--quant  { background: var(--duo-blue); }
.balance-bar--verbal { background: var(--duo-green); }
.balance-bar--di     { background: var(--duo-purple); }
.balance-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 6px;
}
.balance-msg {
  font-size: 12px;
  padding: 5px 8px;
  border-radius: 6px;
  font-weight: 600;
}
.balance-msg--ok   { background: #d1fae5; color: #065f46; }
.balance-msg--warn { background: #fef3c7; color: #92400e; }
[data-theme="dark"] .balance-msg--ok   { background: #052e16; color: #86efac; }
[data-theme="dark"] .balance-msg--warn { background: #2d1f00; color: #fcd34d; }

/* ─── SR Review Button ───────────────────────────── */
.btn-sr-review {
  background: var(--duo-green);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.btn-sr-review:hover { background: var(--duo-green-dark); transform: translateY(-1px); }
.btn-sr-review:active { transform: translateY(0); }

/* ─── Confidence Calibration Alerts ─────────────── */
.calibration-alert {
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  margin-top: 8px;
  line-height: 1.4;
}
.calibration-alert--overconfident {
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fcd34d;
}
.calibration-alert--underconfident {
  background: #dbeafe;
  color: #1e40af;
  border: 1px solid #93c5fd;
}
[data-theme="dark"] .calibration-alert--overconfident { background: #2d1f00; color: #fcd34d; border-color: #92400e; }
[data-theme="dark"] .calibration-alert--underconfident { background: #0f172a; color: #93c5fd; border-color: #1e40af; }

/* ─── Topic Mastery Grid ─────────────────────────── */
#mastery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
  padding: 4px 0;
}
.mastery-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 8px 10px;
  border-radius: 14px;
  border: 2px solid var(--mastery-color, var(--border));
  background: var(--surface);
  text-align: center;
  transition: transform 0.15s;
}
.mastery-card:hover { transform: translateY(-2px); }
.mastery-stars {
  font-size: 16px;
  letter-spacing: 1px;
  color: var(--mastery-color, var(--text-muted));
}
.mastery-topic {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}
.mastery-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--mastery-color, var(--text-muted));
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.mastery-bar-wrap {
  width: 80%;
  height: 4px;
  background: var(--surface-soft);
  border-radius: 2px;
  overflow: hidden;
  margin: 2px 0;
}
.mastery-bar {
  height: 100%;
  border-radius: 2px;
  transition: width 0.4s ease;
}
.mastery-stats {
  font-size: 10px;
  color: var(--text-muted);
}

/* ─── Achievement Badge Gallery ─────────────────── */
.badge-gallery-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.badge-gallery-count {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  white-space: nowrap;
}
.badge-gallery-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--surface-soft);
  border-radius: 4px;
  overflow: hidden;
}
.badge-gallery-progress-fill {
  height: 100%;
  background: var(--duo-green);
  border-radius: 4px;
  transition: width 0.4s ease;
}
.badge-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 10px;
}
.badge-gallery-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 8px;
  border-radius: 12px;
  border: 2px solid var(--border);
  background: var(--surface);
  text-align: center;
  transition: transform 0.15s, box-shadow 0.15s;
  cursor: default;
}
.badge-gallery-item--unlocked {
  border-color: var(--duo-green);
  background: var(--duo-green-bg);
}
.badge-gallery-item--unlocked:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(88, 204, 2, 0.25);
}
.badge-gallery-item--locked {
  opacity: 0.45;
}
.badge-gallery-icon { font-size: 28px; line-height: 1; }
.badge-gallery-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}
.badge-gallery-desc {
  font-size: 10px;
  color: var(--text-secondary);
  line-height: 1.3;
}
[data-theme="dark"] .badge-gallery-item--unlocked {
  background: #052e16;
  border-color: #4ade80;
}

/* ─── Type Pacing Table ──────────────────────────── */
.type-pacing-row {
  display: grid;
  grid-template-columns: 48px 1fr 90px;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}
.type-pacing-row:last-child { border-bottom: none; }
.type-pacing-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
}
.type-pacing-bar-wrap {
  position: relative;
  height: 10px;
  background: var(--surface-soft);
  border-radius: 5px;
  overflow: visible;
}
.type-pacing-bar {
  height: 100%;
  border-radius: 5px;
  transition: width 0.4s ease;
}
.type-pacing-bar.pace--fast { background: #4ade80; }
.type-pacing-bar.pace--ok   { background: #60a5fa; }
.type-pacing-bar.pace--slow { background: #fb923c; }
.type-pacing-target-line {
  position: absolute;
  left: 100px; /* 100% of target = 100px */
  top: -2px;
  bottom: -2px;
  width: 2px;
  background: var(--border-strong);
  border-radius: 1px;
}
.type-pacing-val {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  text-align: right;
}
.type-pacing-target {
  font-weight: 400;
  color: var(--text-muted);
}

/* ─── Daily Missions Panel ─────────────────────── */
.daily-missions-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 12px;
}
.daily-missions-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}
.daily-missions-icon { font-size: 16px; }
.daily-missions-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.daily-mission {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 6px;
  border-radius: 8px;
  transition: background 0.15s;
}
.daily-mission + .daily-mission {
  border-top: 1px solid var(--border);
}
.daily-mission--done {
  opacity: 0.6;
}
.daily-mission-icon {
  font-size: 18px;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}
.daily-mission-info {
  flex: 1;
  min-width: 0;
}
.daily-mission-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.daily-mission-sub {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.daily-mission-go {
  flex-shrink: 0;
  background: var(--duo-blue);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.daily-mission-go:hover {
  background: var(--duo-blue-dark);
  transform: scale(1.05);
}
.daily-mission-go:active { transform: scale(0.97); }

/* dark mode */
[data-theme="dark"] .daily-missions-card {
  background: var(--surface);
  border-color: var(--border);
}

/* ─── Pace Feedback ──────────────────────────────── */
.pace-feedback {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  margin: 6px 0;
}
.pace--fast {
  background: #d1fae5;
  color: #065f46;
}
.pace--ok {
  background: #dbeafe;
  color: #1e40af;
}
.pace--slow {
  background: #fef3c7;
  color: #92400e;
}
.pace-icon { font-size: 14px; }
.pace-time { font-weight: 800; }
.pace-target { opacity: 0.85; }
[data-theme="dark"] .pace--fast { background: #052e16; color: #86efac; }
[data-theme="dark"] .pace--ok   { background: #0f172a; color: #93c5fd; }
[data-theme="dark"] .pace--slow { background: #2d1f00; color: #fcd34d; }

/* Bookmark button */
.btn-bookmark {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  padding: 4px 6px;
  border-radius: 6px;
  color: var(--text-secondary);
  transition: color 0.15s, transform 0.15s;
}
.btn-bookmark:hover { color: #f59e0b; transform: scale(1.15); }
.btn-bookmark.bookmarked { color: #f59e0b; }
[data-theme="dark"] .btn-bookmark { color: var(--text-secondary); }
[data-theme="dark"] .btn-bookmark.bookmarked { color: #fbbf24; }

/* Bookmark list in Review */
.bookmark-item { background: var(--bg-secondary); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.bookmark-item-header { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; flex-wrap: wrap; }
.bookmark-type-badge { background: var(--duo-green); color: #fff; border-radius: 4px; font-size: 11px; font-weight: 700; padding: 2px 6px; }
.bookmark-topic { font-size: 13px; font-weight: 600; flex: 1; }
.bookmark-diff { font-size: 11px; padding: 2px 6px; border-radius: 4px; font-weight: 600; }
.bookmark-diff.diff-easy   { background: #d1fae5; color: #065f46; }
.bookmark-diff.diff-medium { background: #dbeafe; color: #1e40af; }
.bookmark-diff.diff-hard   { background: #fee2e2; color: #991b1b; }
.bookmark-acc { font-size: 12px; color: var(--text-secondary); margin-left: auto; }
.bookmark-remove { background: none; border: none; cursor: pointer; font-size: 14px; color: var(--text-secondary); padding: 2px 4px; border-radius: 4px; }
.bookmark-remove:hover { color: #ef4444; background: #fee2e2; }
.bookmark-question-text { font-size: 13px; color: var(--text-secondary); margin: 0; line-height: 1.5; }
.bookmark-actions { margin-top: 16px; text-align: center; }
[data-theme="dark"] .bookmark-diff.diff-easy   { background: #052e16; color: #86efac; }
[data-theme="dark"] .bookmark-diff.diff-medium { background: #0f172a; color: #93c5fd; }
[data-theme="dark"] .bookmark-diff.diff-hard   { background: #2d1009; color: #fca5a5; }
.bookmark-annotation { font-size: 12px; color: #78350f; background: #fef9c3; border-radius: 6px; padding: 4px 8px; margin-top: 4px; }
[data-theme="dark"] .bookmark-annotation { color: #fcd34d; background: #2d2500; }

/* Legacy (non-GMAT Focus 2026) badge */
.badge-legacy {
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fbbf24;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  white-space: nowrap;
}
[data-theme="dark"] .badge-legacy { background: #2d1f00; color: #fcd34d; border-color: #d97706; }

/* Annotations */
.annotation-row { margin: 8px 0; }
.annotation-display { display: flex; align-items: flex-start; gap: 6px; background: #fef9c3; border-radius: 8px; padding: 8px 10px; margin-bottom: 6px; font-size: 13px; }
.annotation-note-icon { font-size: 14px; flex-shrink: 0; }
.annotation-note-text { flex: 1; line-height: 1.5; color: #78350f; }
.annotation-edit { font-size: 11px; background: none; border: 1px solid #d97706; color: #d97706; border-radius: 4px; padding: 2px 6px; cursor: pointer; flex-shrink: 0; }
.annotation-edit:hover { background: #fef3c7; }
.annotation-input-area { margin-bottom: 6px; }
.annotation-textarea { width: 100%; box-sizing: border-box; border: 1.5px solid var(--duo-green); border-radius: 8px; padding: 8px 10px; font-size: 13px; font-family: inherit; resize: vertical; background: var(--bg-card); color: var(--text-primary); }
.annotation-textarea:focus { outline: none; border-color: var(--duo-blue); box-shadow: 0 0 0 3px var(--duo-blue-bg); }
.annotation-btns { display: flex; gap: 8px; margin-top: 6px; justify-content: flex-end; }
.btn-annotation { font-size: 12px; padding: 4px 10px; background: none; border: 1px dashed var(--text-secondary); color: var(--text-secondary); border-radius: 6px; cursor: pointer; }
.btn-annotation:hover { border-color: var(--duo-green); color: var(--duo-green); background: var(--duo-green-bg, #f0fdf4); }
[data-theme="dark"] .annotation-display { background: #2d2500; }
[data-theme="dark"] .annotation-note-text { color: #fcd34d; }
[data-theme="dark"] .annotation-edit { border-color: #fbbf24; color: #fbbf24; }
[data-theme="dark"] .annotation-edit:hover { background: #1c1500; }

/* Weak Spots Widget */
.weak-spot-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 10px; margin-bottom: 8px; background: var(--bg-secondary); }
.weak-spot--critical { border-left: 3px solid #ef4444; }
.weak-spot--warn     { border-left: 3px solid #f59e0b; }
.weak-spot--ok       { border-left: 3px solid #10b981; }
.weak-spot-info { flex: 1; min-width: 0; }
.weak-spot-topic { font-size: 13px; font-weight: 700; display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.weak-spot-stats { font-size: 11px; color: var(--text-secondary); }
.weak-spot-bar-wrap { width: 80px; height: 8px; background: var(--bg-tertiary, #e5e7eb); border-radius: 4px; overflow: hidden; flex-shrink: 0; }
.weak-spot-bar { height: 100%; background: var(--duo-green); border-radius: 4px; }
.weak-spot--critical .weak-spot-bar { background: #ef4444; }
.weak-spot--warn     .weak-spot-bar { background: #f59e0b; }
.weak-spot-drill { font-size: 12px; padding: 4px 10px; flex-shrink: 0; }

/* Exam results by-type breakdown */
.exam-type-breakdown { margin-top: 16px; }
.exam-type-row { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
.exam-type-label { width: 40px; font-size: 12px; font-weight: 700; color: var(--text-secondary); flex-shrink: 0; }
.exam-type-bar-wrap { flex: 1; height: 10px; background: var(--bg-secondary); border-radius: 5px; overflow: hidden; }
.exam-type-bar { height: 100%; border-radius: 5px; transition: width 0.4s ease; }
.exam-type-bar--ok  { background: #10b981; }
.exam-type-bar--mid { background: #f59e0b; }
.exam-type-bar--low { background: #ef4444; }
.exam-type-pct { font-size: 12px; font-weight: 600; color: var(--text-secondary); white-space: nowrap; }
[data-theme="dark"] .exam-type-bar--ok  { background: #059669; }
[data-theme="dark"] .exam-type-bar--mid { background: #d97706; }
[data-theme="dark"] .exam-type-bar--low { background: #dc2626; }

@media (max-width: 380px) {
  .stat-pill { padding: 4px 6px; }
  .stat-pill-label { display: none; }
  .daily-goal-ring { display: none; }
}

/* Section break card (full-test mode) */
.section-break-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 48px 24px; gap: 12px;
  background: var(--card-bg); border-radius: 16px;
  border: 1px solid var(--border); max-width: 460px; margin: 40px auto;
  box-shadow: 0 4px 24px rgba(0,0,0,.08);
}
.section-break-icon { font-size: 48px; }
.section-break-title { font-size: 22px; font-weight: 700; color: var(--text-primary); margin: 0; }
.section-break-body { font-size: 15px; color: var(--text-secondary); line-height: 1.6; margin: 0; }
[data-theme="dark"] .section-break-card { box-shadow: 0 4px 24px rgba(0,0,0,.3); }

/* Table Analysis question table */
.ta-table-wrap { overflow-x: auto; margin: 12px 0; border-radius: 10px; border: 1px solid var(--border); }
.ta-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.ta-table th {
  background: var(--bg-secondary); color: var(--text-secondary);
  font-weight: 700; text-align: left;
  padding: 8px 14px; border-bottom: 2px solid var(--border);
  white-space: nowrap;
}
.ta-table td {
  padding: 7px 14px; border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}
.ta-table tr:last-child td { border-bottom: none; }
.ta-table tr:hover td { background: var(--surface-soft); }
.ta-preamble { margin: 0 0 8px; }
.ta-postamble { margin: 12px 0 0; font-weight: 600; }
[data-theme="dark"] .ta-table th { background: rgba(255,255,255,.05); }
[data-theme="dark"] .ta-table tr:hover td { background: rgba(255,255,255,.04); }

/* Error classification advice tip */
.error-advice {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--surface-soft);
  border-left: 3px solid var(--duo-orange);
  padding: 8px 12px;
  border-radius: 0 8px 8px 0;
  line-height: 1.5;
}

/* ════════════════════════════════════════════════════════
   UI POLISH PASS — Spacing, sizing, consistency improvements
   ════════════════════════════════════════════════════════ */

/* ── Sidebar: wider for filter readability ── */
.practice-sidebar {
  width: 220px;
}

/* ── Filter groups: slightly more breathing room ── */
.filter-col {
  gap: 12px;
}

.filter-group label {
  font-size: 10px;
  margin-bottom: 1px;
}

.filter-group select {
  font-size: 13px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
}

/* ── More filters toggle: cleaner button style ── */
.more-filters-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  text-align: left;
  background: var(--surface-soft);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-top: 2px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s var(--easing);
  letter-spacing: 0.02em;
}
.more-filters-toggle:hover {
  border-color: var(--duo-blue);
  color: var(--duo-blue-dark);
  background: var(--duo-blue-bg);
}

/* ── Question card: consistent top padding after timer bar ── */
.question-card {
  padding-top: 28px;
}

/* ── Badge row: better vertical alignment and min-height ── */
.qcard-meta {
  min-height: 44px;
  gap: 6px;
  margin-bottom: 20px;
  padding-bottom: 14px;
}

/* ── Badges: consistent height and vertical alignment ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 11px;
  line-height: 1;
  min-height: 28px;
  vertical-align: middle;
}

/* ── Icon buttons in meta row: consistent 36×36 sizing ── */
.btn-flag,
.btn-bookmark,
.btn-theory-meta,
.btn-copy-question {
  width: 36px;
  height: 36px;
  min-width: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ── Friendly empty states (Duolingo-style) ── */
.empty-state-friendly {
  text-align: center;
  padding: 28px 18px;
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: var(--surface-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.empty-state-emoji { font-size: 38px; line-height: 1; margin-bottom: 4px; }
.empty-state-title {
  font-weight: 800;
  font-size: 15px;
  color: var(--text-primary);
}
.empty-state-body {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 280px;
}
.empty-state-body strong { color: var(--duo-green-dark); }

/* ── Duolingo-style lesson progress bar (sits above the question card) ── */
.lesson-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  padding: 0;
}
.lesson-progress-track {
  flex: 1;
  height: 12px;
  background: var(--surface-soft);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(0,0,0,0.06);
  position: relative;
}
.lesson-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--duo-green), #4ade80);
  border-radius: 999px;
  box-shadow: inset 0 -3px 0 rgba(0,0,0,0.08);
  transition: width 0.45s var(--easing);
  position: relative;
}
.lesson-progress-fill::after {
  content: '';
  position: absolute;
  top: 2px; left: 6px; right: 6px;
  height: 3px;
  background: rgba(255,255,255,0.55);
  border-radius: 999px;
}
.lesson-progress.complete .lesson-progress-fill {
  background: linear-gradient(90deg, var(--duo-orange), #fbbf24);
}
.lesson-progress-text {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  min-width: 40px;
  text-align: right;
}
.lesson-progress.complete .lesson-progress-text { color: var(--duo-orange-dark); }

.btn-copy-question {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--text-muted);
  transition: all 0.15s var(--easing);
  padding: 0;
  cursor: pointer;
  box-shadow: 0 3px 0 var(--border);
}
.btn-copy-question:hover {
  border-color: var(--duo-blue);
  color: var(--duo-blue-dark);
  background: var(--duo-blue-bg);
}
.btn-copy-question:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 var(--border);
}
.btn-copy-question.copied {
  border-color: var(--duo-green);
  color: var(--duo-green-dark);
  background: var(--duo-green-bg);
  box-shadow: 0 3px 0 var(--duo-green-dark);
}

.btn-bookmark {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  color: var(--text-muted);
  transition: all 0.15s var(--easing);
  padding: 0;
  box-shadow: 0 3px 0 var(--border);
}
.btn-bookmark:hover {
  color: #f59e0b;
  border-color: #f59e0b;
  background: #fef9c3;
  box-shadow: 0 3px 0 #d97706;
}
.btn-bookmark.bookmarked {
  color: #f59e0b;
  border-color: #f59e0b;
  background: #fef9c3;
  box-shadow: 0 3px 0 #d97706;
}
.btn-bookmark:active { transform: translateY(3px); box-shadow: none; }

/* ── Timer pill in meta row: proper height ── */
.timer {
  min-height: 36px;
  padding: 0 12px;
}

/* ── Choice buttons: slightly more room for text ── */
.choice {
  padding: 14px 18px;
  min-height: 60px;
  gap: 14px;
}

/* ── Choice letter badge: slightly larger for readability ── */
.choice-letter {
  width: 34px;
  height: 34px;
  font-size: 14px;
  flex-shrink: 0;
}

/* ── Choice text: proper line-height ── */
.choice-text {
  font-size: 16px;
  line-height: 1.55;
  font-weight: 600;
}

/* ── QCard actions row: better alignment ── */
.qcard-actions {
  gap: 10px;
  margin-top: 4px;
  padding-top: 4px;
}

/* ── Keyboard shortcut hint: tighter but readable ── */
.kbd-shortcuts-hint {
  font-size: 11px;
  padding: 8px 0 4px;
  opacity: 0.65;
  letter-spacing: 0.01em;
}

/* ── Hint panel: better spacing ── */
.hint-panel {
  margin-top: 16px;
  padding: 16px 20px;
  gap: 14px;
  border-radius: var(--radius);
}

.hint-icon {
  font-size: 22px;
  margin-top: 0;
  flex-shrink: 0;
}

.hint-text {
  font-size: 14px;
  line-height: 1.65;
}

/* ── Inline feedback: comprehensive spacing improvements ── */
.feedback-inline {
  margin-top: 20px;
  border-radius: var(--radius-lg);
  border-width: 2px;
}

.feedback-inline-answer {
  padding: 14px 18px 10px;
  gap: 10px;
  align-items: center;
}

.feedback-inline-label {
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.feedback-inline-answer-text {
  font-size: 15px;
  font-weight: 700;
}

.feedback-inline-explanation {
  padding: 0 18px 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-primary);
}

/* ── Theory snippet: better visual separation ── */
.theory-snippet {
  font-size: 13px;
  line-height: 1.6;
  margin: 4px 18px 10px;
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ── Pace feedback: consistent margins in inline panel ── */
.pace-feedback {
  margin: 4px 18px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  padding: 8px 12px;
}

/* ── Difficulty rating row: proper padding within inline panel ── */
.difficulty-rating-row {
  padding: 8px 18px 4px;
  gap: 8px;
}

.difficulty-rating-label {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
  margin-right: 2px;
}

.diff-rate-btn {
  font-size: 20px;
  padding: 3px 5px;
  border-radius: 8px;
  transition: transform 0.15s var(--easing), background 0.15s, border-color 0.15s;
}

/* ── Error tag row: proper visual weight ── */
.error-tag-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px 6px;
  flex-wrap: wrap;
}

.error-tag-label {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
  margin-right: 2px;
}

.error-tag-btn {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s var(--easing);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.error-tag-btn:hover {
  border-color: var(--duo-red);
  color: var(--duo-red-dark);
  background: var(--duo-red-bg);
  transform: translateY(-1px);
}
.error-tag-btn.active {
  background: var(--duo-red-bg);
  border-color: var(--duo-red);
  color: var(--duo-red-dark);
  font-weight: 800;
  box-shadow: 0 2px 0 var(--duo-red-dark);
}
[data-theme="dark"] .error-tag-btn { background: var(--surface); }
[data-theme="dark"] .error-tag-btn.active { background: rgba(255, 75, 75, 0.15); }

/* ── Confidence tag row ── */
.confidence-tag-row {
  padding: 8px 18px 4px;
  gap: 8px;
}

.confidence-tag-label {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-right: 2px;
}

.confidence-btn {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  border: 2px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s var(--easing);
}

/* ── Annotation row ── */
.annotation-row {
  margin: 6px 18px 4px;
}

.btn-annotation {
  font-size: 12px;
  padding: 7px 14px;
  background: none;
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
  cursor: pointer;
  transition: all 0.15s var(--easing);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-annotation:hover {
  border-color: var(--duo-green);
  color: var(--duo-green-dark);
  background: var(--duo-green-bg);
  border-style: solid;
}

.annotation-textarea {
  font-size: 13.5px;
  padding: 10px 12px;
  line-height: 1.55;
}

/* ── Feedback inline action buttons ── */
.feedback-inline-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 8px 18px 16px;
}

.feedback-inline-actions .btn {
  font-size: 12px;
  padding: 9px 16px;
  border-bottom-width: 3px;
  border-radius: var(--radius);
  letter-spacing: 0.5px;
}

/* ── Session tracker: slightly more padding ── */
.session-tracker {
  padding: 20px 16px;
  gap: 12px;
}

.session-stat {
  padding: 8px 6px;
}

.session-stat-value {
  font-size: 28px;
}

.session-stat-label {
  font-size: 11px;
  margin-top: 4px;
}

/* ── Dashboard cards: consistent sizing ── */
.dash-card {
  padding: 24px;
}

.dash-card-label {
  font-size: 11px;
  margin-bottom: 10px;
}

.dash-card-value {
  font-size: 38px;
  line-height: 1;
}

.dash-card-sub {
  font-size: 12px;
  margin-top: 8px;
}

/* ── Dashboard section panels ── */
.dash-section {
  padding: 24px;
  margin-bottom: 20px;
}

.dash-section-title {
  font-size: 12px;
  letter-spacing: 0.1em;
  margin-bottom: 18px;
}

/* ── Modal: consistent padding ── */
.modal-header {
  padding: 24px 28px 20px;
}

.modal-body {
  padding: 24px 28px;
}

.modal-footer {
  padding: 18px 28px;
  gap: 10px;
}

/* ── Tab bar: consistent spacing ── */
.tab-btn {
  padding: 16px 22px;
  font-size: 13px;
  letter-spacing: 0.07em;
}

/* ── View toggle buttons: consistent ── */
.practice-sidebar .view-toggle-btn {
  font-size: 12px;
  padding: 8px 8px;
}

/* ── Daily missions card: minor spacing ── */
.daily-missions-card {
  padding: 14px;
}

.daily-tip-card {
  padding: 14px;
}

/* ── Score predictor / dashboard quick-access buttons ── */
.quick-filter-chips .qf-chip {
  font-size: 13px;
  padding: 9px 16px;
  border-radius: 999px;
}

/* ── Study Phase Banner polish ── */
.study-phase-banner {
  padding: 16px 20px;
  gap: 14px;
  border-radius: var(--radius-lg);
  border-width: 2px;
  border-left-width: 5px;
  margin-bottom: 20px;
}

.phase-badge {
  font-size: 12px;
  font-weight: 800;
  padding: 6px 14px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.phase-label {
  font-size: 15px;
  font-weight: 800;
}

.phase-desc {
  font-size: 12.5px;
  margin-top: 3px;
  line-height: 1.5;
}

.phase-progress-wrap {
  height: 6px;
  margin-top: 8px;
  border-radius: 3px;
}

/* ── Feedback panel (old-style separate panel, kept for compat) ── */
.qcard-feedback {
  margin-top: 20px;
  padding: 22px 24px;
}

.feedback-status {
  font-size: 18px;
  font-weight: 900;
}

.feedback-explanation {
  font-size: 14px;
  line-height: 1.7;
  padding: 14px 16px;
}

/* ── App main content max-width and padding refinement ── */
.app-main {
  padding: 24px 28px;
  max-width: 1120px;
}

/* Study Phase Banner — see "UI POLISH PASS" block above for the updated styles */
.phase-next { font-size: 11px; color: var(--text-muted); width: 100%; margin-top: 2px; }
[data-theme="dark"] .study-phase-banner { background: var(--card-bg); }

/* More filters toggle — see "UI POLISH PASS" block above for the main styles */
.more-filters-body { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }

/* Log panel (post-answer collapsible) */
.log-panel { margin-top: 12px; }
.log-panel-toggle {
  display: block; width: 100%; text-align: center;
  background: none; border: 1px dashed var(--border); border-radius: 8px;
  padding: 7px 12px; font-size: 12px; font-weight: 600;
  color: var(--text-muted); cursor: pointer; transition: all 0.2s;
}
.log-panel-toggle:hover { color: var(--text-secondary); border-color: var(--text-muted); }
.log-panel-body { padding: 12px 0 4px; display: flex; flex-direction: column; gap: 10px; }

/* Question-specific theory explanation block */
.theory-q-explanation {
  background: var(--surface-soft); border-radius: 10px;
  padding: 14px 16px; margin-bottom: 16px;
  border-left: 3px solid var(--duo-green);
}
.theory-q-expl-label {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .05em; color: var(--duo-green); margin-bottom: 8px;
}
.theory-q-expl-body {
  font-size: 13px; line-height: 1.65; color: var(--text-primary);
  white-space: pre-wrap;
}