/* ============================================================
   OpenFlashcards – style.css
   ============================================================ */

/* ── Variables ──────────────────────────────────────────────── */
:root {
  --primary: #439b00;
  --primary-dk: #ffffff;
  --primary-hvr: #327400;
  --primary-bg: #439b00;
  --primary-bg-correct: #439b007c;
  --danger: #ff4b4b;
  --danger-dk: #d93636;
  --danger-bg: #ffe0e0;
  --warning: #ffc800;
  --info: #1cb0f6;
  --info-bg: #e8f7fd;
  --surface: #ffffff;
  --surface-2: #f7f7f7;
  --bg: #f0f0f0;
  --border: #e0e0e0;
  --text: #1c1c1c;
  --text-muted: #777;
  --text-faint: #aaa;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(0, 0, 0, .07);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, .13);
  --transition: .18s ease;
  --nav-h: 62px;
}

[data-theme="dark"] {
  --primary: #439b00;
  --primary-dk: #ffffff;
  --primary-hvr: #327400;
  --primary-bg: #439b00;
  --primary-bg-correct: #439b007c;
  --danger: #ff6b6b;
  --danger-dk: #cc3333;
  --danger-bg: #2d1010;
  --info: #38bdf8;
  --info-bg: #0c2536;
  --surface: #1e1e1e;
  --surface-2: #161616;
  --bg: #121212;
  --border: #333;
  --text: #f0f0f0;
  --text-muted: #999;
  --text-faint: #555;
  --shadow: 0 4px 24px rgba(0, 0, 0, .4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, .6);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
}

/* ── LOGIN ──────────────────────────────────────────────────── */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e9f9d8 0%, #d0f0a8 100%);
  padding: 20px;
}

[data-theme="dark"] .login-screen {
  background: linear-gradient(135deg, #0d1a04 0%, #1a2e06 100%);
}

.login-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 40px 36px 36px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.login-logo {
  display: block;
  width: 150px;
  height: 150px;
  margin: 0 auto 8px;
  object-fit: contain;
}

.login-title {
  font-size: 1.7rem;
  font-weight: 900;
  text-align: center;
  color: var(--primary);
  margin-bottom: 4px;
}

.login-sub {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: .92rem;
}

/* ── NAVBAR ─────────────────────────────────────────────────── */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: var(--nav-h);
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 8px;
}

.nav-brand {
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-logo {
  height: 2em;
  width: auto;
  border-radius: 4px;
}

.lang-badge {
  font-size: .7rem;
  font-weight: 700;
  background: var(--primary-bg);
  color: var(--primary-dk);
  padding: 2px 8px;
  border-radius: 999px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}

.nav-link {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 600;
  font-size: .83rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover {
  background: var(--surface-2);
  color: var(--text);
}

.nav-link.active {
  background: var(--primary-bg);
  color: var(--primary-dk);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
  padding: 4px 8px;
}

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-muted);
  transition: background var(--transition);
}

.btn-icon:hover {
  background: var(--surface-2);
  color: var(--text);
}

/* ── PAGE CONTENT ───────────────────────────────────────────── */
.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

.page-content.notebook-active {
  max-width: none;
  padding: 0;
  margin: 0;
}

.page-title {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 24px;
}

/* ── BUTTONS ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: scale(.97);
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-dk);
}

.btn-primary:hover {
  background: var(--primary-hvr);
  box-shadow: 0 4px 12px var(--primary-bg-correct);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 2px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover {
  background: var(--danger-dk);
}

.btn-full {
  width: 100%;
}

.btn-sm {
  padding: 7px 14px;
  font-size: .82rem;
}

.btn:disabled {
  opacity: .5;
  cursor: not-allowed;
}

/* ── FORMS ──────────────────────────────────────────────────── */
.field-group {
  margin-bottom: 16px;
}

.field-group label {
  display: block;
  font-weight: 600;
  font-size: .88rem;
  margin-bottom: 6px;
  color: var(--text-muted);
}

.field-group input,
.field-group textarea,
.field-group select {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .97rem;
  background: var(--surface-2);
  color: var(--text);
  outline: none;
  transition: border-color var(--transition);
}

.field-group input:focus,
.field-group textarea:focus,
.field-group select:focus {
  border-color: var(--primary);
}

.field-group textarea {
  resize: vertical;
  min-height: 70px;
  font-family: inherit;
}

.required {
  color: var(--danger);
}

.optional {
  color: var(--text-faint);
  font-size: .8em;
}

/* ── CARDS ──────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1.5px solid var(--border);
}

.card+.card {
  margin-top: 16px;
}

/* ── ALERTS ─────────────────────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: .92rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.alert-danger {
  background: var(--danger-bg);
  color: var(--danger-dk);
}

.alert-success {
  background: var(--primary-bg);
  color: var(--primary-dk);
}

.alert-info {
  background: var(--info-bg);
  color: var(--info);
}

.hidden {
  display: none !important;
}

/* ── BADGES ─────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.badge-noun {
  background: #dbeafe;
  color: #1d4ed8;
}

.badge-verb {
  background: #fef9c3;
  color: #854d0e;
}

.badge-adjective {
  background: #fce7f3;
  color: #9d174d;
}

.badge-adverb {
  background: #d1fae5;
  color: #065f46;
}

.badge-phrase {
  background: #ede9fe;
  color: #5b21b6;
}

.badge-other {
  background: #f0f0f0;
  color: #555555;
}

[data-theme="dark"] .badge-noun {
  background: #1e3a5f;
  color: #93c5fd;
}

[data-theme="dark"] .badge-verb {
  background: #4a3200;
  color: #fde68a;
}

[data-theme="dark"] .badge-adjective {
  background: #500724;
  color: #fbcfe8;
}

[data-theme="dark"] .badge-adverb {
  background: #064e3b;
  color: #6ee7b7;
}

[data-theme="dark"] .badge-phrase {
  background: #2e1065;
  color: #c4b5fd;
}

[data-theme="dark"] .badge-other {
  background: #333333;
  color: #aaaaaa;
}

/* ── HOME / STATS ───────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow);
}

.stat-card-clickable {
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.stat-card-clickable:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
  border-color: var(--primary);
}

.stat-card-clickable:active {
  transform: translateY(0);
  box-shadow: var(--shadow);
}

.stat-number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
}

.stat-label {
  font-size: .8rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 600;
}

.quick-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

/* ── VOCAB / WORD GRID ──────────────────────────────────────── */
.vocab-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
  align-items: center;
}

.search-input {
  flex: 1;
  min-width: 160px;
  padding: 10px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  background: var(--surface);
  color: var(--text);
  outline: none;
}

.search-input:focus {
  border-color: var(--primary);
}

.type-filter {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.type-btn {
  padding: 6px 14px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: .82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.type-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.type-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-dk);
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}

.word-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  border: 1.5px solid var(--border);
  position: relative;
  transition: box-shadow var(--transition), transform var(--transition);
}

.word-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.word-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.word-literal {
  font-size: 1.1rem;
  font-weight: 800;
}

.word-trans {
  color: var(--text-muted);
  font-size: .92rem;
  margin-bottom: 4px;
}

.word-def {
  color: var(--text-faint);
  font-size: .82rem;
  font-style: italic;
}

.word-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.difficulty-bar {
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  margin-top: 10px;
  overflow: hidden;
}

.difficulty-fill {
  height: 100%;
  border-radius: 2px;
  background: var(--primary);
  transition: width .3s;
}

.progress-bar-wrap {
  height: 5px;
  border-radius: 3px;
  background: var(--border);
  margin-top: 10px;
  overflow: hidden;
  cursor: default;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--primary) 0%, #2ecc71 100%);
  transition: width .4s ease;
}

.progress-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}

.progress-row .progress-bar-wrap {
  flex: 1;
  margin-top: 0;
  min-width: 0;
}

.progress-pct {
  font-size: .72rem;
  color: var(--text-faint);
  font-weight: 600;
  min-width: 2.6em;
  text-align: right;
}

.mastered-badge {
  display: inline-block;
  margin-top: 8px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .04em;
  padding: 2px 10px;
  border-radius: 999px;
  background: #1abc9c20;
  border: 1.5px solid #1abc9c;
  color: #1abc9c;
}

/* ── QUIZ / TRAINING ────────────────────────────────────────── */
.score-bar {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
}

.score-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 1rem;
}

.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 20px;
}

.quiz-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-lg);
  border: 1.5px solid var(--border);
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.quiz-card.correct {
  border-color: transparent;
}

.correct-border-svg {
  /* glow is handled via box-shadow on the card's ::before for exterior-only */
}

.correct-breathe::before {
  content: '';
  position: absolute;
  inset: -1.5px;
  border-radius: inherit;
  pointer-events: none;
  animation: breatheGlow 2.6s ease-in-out infinite;
}

@keyframes breatheGlow {

  0%,
  100% {
    box-shadow: 0 0 5px 3px rgba(67, 155, 0, 0.15);
  }

  50% {
    box-shadow: 0 0 22px 10px rgba(67, 155, 0, 0.8);
  }
}

.question-word {
  font-size: 2.2rem;
  font-weight: 900;
  margin: 12px 0;
  color: var(--text);
  word-break: break-all;
  overflow-wrap: anywhere;
  width: 100%;
  min-width: 0;
  hyphens: auto;
}

.question-hint {
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: 8px;
  font-style: italic;
}

.question-def {
  color: var(--text-faint);
  font-size: .85rem;
  margin-bottom: 16px;
  font-style: italic;
}

.question-instr {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: .92rem;
}

.choices-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  width: 100%;
  max-width: 500px;
}

.choice-btn {
  padding: 14px 12px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 1.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.choice-btn:hover {
  border-color: var(--primary);
  background: var(--primary-bg);
}

.choice-btn.correct {
  background: var(--primary-bg);
  border-color: var(--primary);
  color: var(--primary-dk);
}

.choice-btn.wrong {
  background: var(--danger-bg);
  border-color: var(--danger);
  color: var(--danger-dk);
}

.result-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.result-message {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.result-answer {
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* ── PHRASE TRAINING ────────────────────────────────────────── */
.phrase-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-lg);
  border: 1.5px solid var(--border);
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.phrase-card.correct {
  border-color: transparent;
}

.phrase-translation {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Clickable words in phrase translation */
.phrase-word-clickable {
  cursor: pointer;
  padding: 0 1px;
  position: relative;
  transition: color var(--transition);
}

.phrase-word-clickable:hover {
  color: var(--primary);
}

.word-tooltip {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--surface);
  font-size: .78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 8px;
  white-space: nowrap;
  z-index: 10;
  pointer-events: none;
}

.word-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--text);
}

.phrase-hint {
  color: var(--text-muted);
  font-size: .88rem;
  margin-bottom: 20px;
  font-style: italic;
}

.answer-zone {
  min-height: 60px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 16px;
  background: var(--surface-2);
  transition: border-color var(--transition);
}

.answer-zone.correct {
  border-color: var(--primary);
  background: var(--primary-bg-correct);
}

.answer-zone.wrong {
  border-color: var(--danger);
  background: var(--danger-bg);
}

.answer-zone-placeholder {
  color: var(--text-faint);
  font-style: italic;
  font-size: .9rem;
}

.word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.word-token {
  padding: 8px 14px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  font-size: 1.5rem;
  transition: all var(--transition);
  user-select: none;
}

.word-token:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.word-token.used {
  opacity: .3;
  pointer-events: none;
}

.word-token.in-answer {
  background: var(--primary-bg);
  border-color: var(--primary);
  color: var(--primary-dk);
}

/* ── WRITING QUIZ ───────────────────────────────────────────── */
.letter-token {
  min-width: 38px;
  /* padding: 8px 10px; */
  text-align: center;
  font-size: 1.5rem !important;
  letter-spacing: .02em;
}

.writing-answer-zone {
  min-height: 56px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  margin-bottom: 16px;
  background: var(--surface-2);
  transition: border-color var(--transition), background var(--transition);
}

.writing-answer-zone.correct {
  border-color: var(--primary);
  background: var(--primary-bg-correct);
}

.writing-answer-zone.wrong {
  border-color: var(--danger);
  background: var(--danger-bg);
}

/* one group of letter-slots per word segment */
.writing-segment {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
}

/* visible space between segments */
.writing-space-sep {
  display: inline-flex;
  align-items: center;
  width: 18px;
  justify-content: center;
  color: var(--text-faint);
  font-size: .7rem;
  user-select: none;
}

/* individual letter slot (empty or filled) */
.letter-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 38px;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  font-size: 1rem;
  font-weight: 700;
  cursor: default;
  transition: background var(--transition), border-color var(--transition);
}

.letter-slot.filled-slot {
  background: var(--primary-bg);
  border-color: var(--primary);
  color: var(--primary-dk);
  cursor: pointer;
}

.letter-slot.filled-slot:hover {
  background: var(--danger-bg);
  border-color: var(--danger);
  color: var(--danger-dk);
}

.phrase-result {
  padding: 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-weight: 700;
}

.phrase-result.correct {
  background: var(--primary-bg);
  color: var(--primary-dk);
}

.phrase-result.wrong {
  background: var(--danger-bg);
  color: var(--danger-dk);
}

.phrase-actions {
  display: flex;
  gap: 10px;
}

/* ── AUTO FLASHCARDS MODE ─────────────────────────────────────── */
.auto-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-lg);
  border: 1.5px solid var(--border);
  min-height: 360px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.auto-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── 3D Flip animation ─────────────────────────── */
.auto-flip-container {
  perspective: 1000px;
  width: 100%;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 8px 0;
}

.auto-flip-inner {
  position: relative;
  width: 100%;
  min-height: 140px;
  transition: transform 0.5s ease;
  transform-style: preserve-3d;
}

.auto-flip-inner.flipped {
  transform: rotateY(180deg);
}

.auto-flip-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 140px;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.auto-flip-back {
  transform: rotateY(180deg);
}

.auto-flip-face .auto-word-display {
  font-size: 2.4rem;
  font-weight: 900;
  margin: 12px 0 8px;
  color: var(--text);
  min-height: 3.2rem;
  word-break: break-all;
  overflow-wrap: anywhere;
  width: 100%;
  min-width: 0;
  hyphens: auto;
}

.auto-flip-back .auto-word-display {
  color: var(--primary);
}

.auto-flip-face .auto-tts-row {
  display: flex;
  gap: 8px;
  justify-content: center;
  min-height: 32px;
  margin-bottom: 4px;
}

/* ── Progress & controls ────────────────────────── */
.auto-progress-container {
  width: 100%;
  max-width: 400px;
  height: 8px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 6px;
  border: 1px solid var(--border);
}

.auto-progress-bar {
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: width .1s linear;
  width: 100%;
}

.auto-time-label {
  font-size: .85rem;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.auto-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ── ADD FORM ───────────────────────────────────────────────── */
.add-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0;
}

.add-tab {
  padding: 10px 18px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  border: none;
  background: none;
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--text-muted);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color var(--transition), border-color var(--transition);
}

.add-tab:hover {
  color: var(--text);
}

.add-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.type-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.type-selector .type-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
}

.conjugation-grid {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
}

.conj-item label {
  font-size: .78rem;
}

.conj-item {
  margin-bottom: 0 !important;
}

/* ── AUTO-TRANSLATE VARIANTS ────────────────────────────────── */
.auto-translate-variants {
  margin-top: 6px;
  padding: 6px 10px;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  font-size: .82rem;
  line-height: 1.6;
  cursor: default;
  user-select: none;
}
.atv-word {
  cursor: pointer;
  color: var(--primary);
  font-weight: 600;
  padding: 1px 3px;
  border-radius: 3px;
  transition: background .15s;
}
.atv-word:hover {
  background: var(--primary);
  color: var(--primary-dk);
}
.atv-sep {
  color: var(--text-faint);
  font-weight: 300;
}

/* ── AUTO-TRANSLATE SUGGESTIONS ─────────────────────────────── */
.auto-translate-suggestions {
  margin-top: 4px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.ats-word {
  cursor: pointer;
  padding: 4px 10px;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  font-size: .82rem;
  color: var(--text);
  transition: background .15s, border-color .15s;
  white-space: nowrap;
}
.ats-word:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-dk);
}
.ats-word strong {
  font-weight: 700;
}

/* ── SETTINGS ───────────────────────────────────────────────── */
.settings-section {
  margin-bottom: 32px;
}

.settings-section h2 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

.lang-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.lang-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--primary-bg);
  border: 1.5px solid var(--primary);
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 700;
  color: var(--primary-dk);
}

.lang-chip .remove-lang {
  cursor: pointer;
  margin-left: 4px;
  opacity: .6;
}

.lang-chip .remove-lang:hover {
  opacity: 1;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  margin-top:16px;gap:10px;
}

.toggle-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

@media (max-width: 640px) {
  .toggle-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  top: 3px;
  left: 3px;
  transition: transform var(--transition);
  box-shadow: 0 1px 4px rgba(0, 0, 0, .2);
}

.toggle-switch input:checked+.toggle-slider {
  background: var(--primary);
}

.toggle-switch input:checked+.toggle-slider::before {
  transform: translateX(20px);
}

/* ── ADMIN ──────────────────────────────────────────────────── */
.user-table {
  width: 100%;
  border-collapse: collapse;
}

.user-table th,
.user-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: .9rem;
}

.user-table th {
  font-weight: 700;
  color: var(--text-muted);
  font-size: .8rem;
  text-transform: uppercase;
}

.role-badge {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 700;
}

.role-admin {
  background: #fef9c3;
  color: #854d0e;
}

.role-user {
  background: var(--info-bg);
  color: var(--info);
}

[data-theme="dark"] .role-admin {
  background: #4a3200;
  color: #fde68a;
}

/* ── MODAL ──────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 20px;
}

.modal-card {
  background: var(--surface);
  border-radius: var(--radius);
  width: 100%;
  max-width: 600px;
  box-shadow: var(--shadow-lg);
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 800;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
}

.modal-body {
  padding: 20px 24px;
}

.modal-footer {
  padding: 0 24px 20px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.modal-footer .btn {
  flex: 0 1 auto;
  min-width: 0;
  white-space: normal;
  text-align: center;
  word-break: break-word;
}

@media (max-width: 600px) {
  .modal-footer .btn {
    font-size: .82rem;
    padding: 6px 12px;
  }

  .modal-footer .btn-reset-progress {
    width: auto;
    margin-right: 0 !important;
    order: -1;
  }

  .modal-footer .btn-reset-progress .btn-reset-text {
    display: none;
  }
}

/* ── SPINNER ────────────────────────────────────────────────── */
.spinner {
  width: 36px;
  height: 36px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .6s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-state {
  text-align: center;
  padding: 40px;
}

.loading-state p {
  color: var(--text-muted);
  margin-top: 12px;
}

/* ── LANG SEARCH ────────────────────────────────────────────── */
.lang-results {
  max-height: 200px;
  overflow-y: auto;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  margin-top: 4px;
}

.lang-result-item {
  padding: 10px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .92rem;
  transition: background var(--transition);
}

.lang-result-item:hover {
  background: var(--surface-2);
}

.lang-result-item.selected {
  background: var(--primary-bg);
}

.lang-result-item.highlighted {
  background: var(--surface-2);
  outline: 2px solid var(--primary);
  outline-offset: -2px;
}

/* ── COMBOBOX WRAPPER ───────────────────────────────────────── */
.combobox-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.combobox-wrap input {
  flex: 1;
  padding-right: 32px !important;
}

.combobox-arrow {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  font-size: .7rem;
  color: var(--text-muted);
  transition: transform .2s;
}

.combobox-arrow.open {
  transform: translateY(-50%) rotate(180deg);
}

/* ── ONBOARDING ─────────────────────────────────────────────── */
.onboarding-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.onboarding-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 36px 32px;
  width: 100%;
  max-width: 520px;
  box-shadow: var(--shadow-lg);
}

.onboarding-card h2 {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 8px;
}

.onboarding-card p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* ── Main (accent) color picker ──────────────────────────────── */
.accent-field {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.accent-field label {
  display: block;
  font-size: .82rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.accent-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.accent-row input[type="color"] {
  width: 44px;
  height: 32px;
  padding: 2px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  cursor: pointer;
}

.accent-hex {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .9rem;
  font-weight: 700;
  color: var(--text);
}

.color-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--surface);
  outline: 1px solid var(--border);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  padding: 0;
}

.color-swatch:hover {
  transform: scale(1.1);
}

.color-swatch.active {
  outline: 3px solid var(--primary);
  box-shadow: var(--shadow);
  transform: scale(1.1);
}

.selected-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 36px;
  margin-bottom: 16px;
}

.selected-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-bg);
  border: 1.5px solid var(--primary);
  color: var(--primary-dk);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
}

.selected-chip::after {
  content: ' ✕';
  opacity: .6;
}

/* ── TRAIN SETTINGS PANEL (collapsible) ─────────────────────── */
.train-settings-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  padding: 4px 10px;
  border-radius: 999px;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
}

.train-settings-toggle.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-dk);
}

.train-settings-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
}

.train-settings-panel.open {
  max-height: 2000px;
}

/* ── CONFETTI CANVAS ──────────────────────────────────────────── */
.confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

/* ── TRAINING TOGGLE ROW ──────────────────────────────────────── */
.train-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  gap: 12px;
}

.train-toggle-row label {
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
}

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hamburger {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 2px solid var(--border);
    flex-direction: column;
    padding: 10px 16px 16px;
    gap: 4px;
    z-index: 99;
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    padding: 10px 14px;
    font-size: .95rem;
  }

  .btn-icon {
    width: 100%;
    justify-content: center;
  }

  .word-grid {
    grid-template-columns: 1fr;
  }

  .choices-grid {
    grid-template-columns: 1fr;
  }

  .question-word {
    font-size: 1.6rem;
  }

  .quiz-card {
    padding: 24px 18px;
  }

  .quiz-card>.next-row {
    order: -1;
    margin-top: 0 !important;
    margin-bottom: 20px;
  }

  .letter-slot {
    min-width: 28px;
    height: 34px;
    font-size: .9rem;
  }

  .writing-segment {
    gap: 3px;
  }

  .writing-answer-zone {
    padding: 8px 12px;
    gap: 3px;
  }

  .page-content {
    padding: 20px 14px 50px;
  }

  .conjugation-grid {
    flex-direction: column;
  }

  .phrase-actions {
    flex-direction: column;
  }

  .user-table th:nth-child(3),
  .user-table td:nth-child(3) {
    display: none;
  }
}

@media (max-width: 400px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .add-tabs {
    gap: 2px;
  }

  .add-tab {
    padding: 8px 10px;
    font-size: .82rem;
  }

  .question-word {
    font-size: 1.3rem;
  }

  .auto-flip-face .auto-word-display {
    font-size: 1.6rem;
  }

  .letter-slot {
    min-width: 24px;
    height: 32px;
    font-size: .85rem;
  }

  .writing-segment {
    gap: 3px;
  }

  .writing-answer-zone {
    padding: 8px 10px;
    gap: 3px;
  }
}

/* ── LABELS ─────────────────────────────────────────────────── */
.label-chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--surface-2);
  color: var(--text-muted);
  transition: opacity .15s;
}

.label-chip.active {
  opacity: 1;
}

.label-chip:not(.active) {
  opacity: .65;
}

.label-pick-btn {
  transition: background .15s, opacity .15s;
}

.label-pick-btn:not(.active) {
  opacity: .7;
}

/* ── FOOTER ──────────────────────────────────────────────────── */
.app-footer {
  text-align: center;
  padding: 24px 16px 32px;
  font-size: .72rem;
  color: var(--text-faint);
}

.app-footer a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

.app-footer a:hover {
  color: var(--text-muted);
}

/* ── OFFLINE MODE ─────────────────────────────────────────────── */
.sync-offline-btn {
  position: relative;
}

.sync-offline-btn.sync-btn-offline {
  color: var(--text-muted);
  opacity: .7;
}

#syncOfflineBtn {
  font-size: 1.1rem;
  transition: transform .3s ease;
}

#syncOfflineBtn:disabled {
  cursor: wait;
}

.offline-status-box {
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: .875rem;
  line-height: 1.6;
}

.offline-progress-bar-wrap {
  width: 100%;
  height: 6px;
  border-radius: 4px;
  background: var(--border);
  overflow: hidden;
}

.offline-progress-bar {
  height: 100%;
  border-radius: 4px;
  background: var(--primary, #6366f1);
  transition: width .25s ease;
}

/* Offline banner shown at top of page when navigating offline */
.offline-banner {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--surface-2);
  border-bottom: 2px solid var(--warning, #f59e0b);
  color: var(--text-muted);
  font-size: .82rem;
  text-align: center;
  padding: 6px 40px 6px 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.offline-banner-close {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 6px;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.offline-banner-close:hover {
  opacity: 1;
}

@keyframes offlineBannerFadeOut {
  from {
    opacity: 1;
    max-height: 60px;
  }

  to {
    opacity: 0;
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
  }
}

.offline-banner-hiding {
  animation: offlineBannerFadeOut 0.4s ease forwards;
  overflow: hidden;
}

/* ── Duplicate comparison grid ─────────────────────────────── */
.dup-grid {
  display: grid;
  grid-template-columns: auto repeat(var(--dup-cols, 2), minmax(100px, 1fr));
  gap: 6px 10px;
  font-size: .8rem;
  min-width: 0;
}

@media (max-width: 900px) {
  .dup-grid {
    grid-template-columns: minmax(min-content, 90px) repeat(var(--dup-cols, 2), minmax(100px, 1fr));
  }
}

/* ═══════════════════════════════════════════════════════════
   NOTEBOOK
   ═══════════════════════════════════════════════════════════ */

.notebook-layout {
  position: relative;
  display: flex;
  height: calc(100vh - var(--nav-h));
  gap: 0;
  overflow: hidden;
  width: 100%;
}

.page-content.notebook-active~.app-footer {
  display: none;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.nb-sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--surface-2);
  border-right: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width .25s ease, min-width .25s ease, max-height .25s ease, opacity .25s ease;
}

/* ── Sidebar collapse toggle ─────────────────────────────── */
.nb-sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 6px;
  background: var(--surface-2);
  border: none;
  border-top: 2px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  font-size: .85rem;
  flex-shrink: 0;
  transition: color var(--transition), background var(--transition);
}

.nb-sidebar-toggle:hover {
  color: var(--text);
  background: var(--border);
}

.nb-sidebar-reopen {
  position: absolute;
  left: 0;
  top: 50%;
  z-index: 20;
  width: 20px;
  height: 52px;
  border-radius: 0 6px 6px 0;
  background: var(--surface-2);
  border: 2px solid var(--border);
  border-left: none;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: .7rem;
  transform: translateY(-50%);
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  box-shadow: 2px 0 6px rgba(0, 0, 0, .06);
}

.nb-sidebar-reopen:hover {
  color: var(--text);
  background: var(--border);
  border-color: var(--text-muted);
}

[data-theme="dark"] .nb-sidebar-reopen {
  box-shadow: 2px 0 8px rgba(0, 0, 0, .25);
}

.nb-sidebar-collapsed .nb-sidebar {
  width: 0;
  min-width: 0;
  overflow: hidden;
  border-right: none;
  padding: 0;
  opacity: 0;
}

.nb-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}

.nb-lang-selector {
  font-size: .82rem;
  font-weight: 700;
  background: var(--surface-2);
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  cursor: pointer;
  outline: none;
  flex: 1;
  min-width: 0;
  margin-right: 20px;
  transition: border-color var(--transition);
}

.nb-lang-selector:focus {
  border-color: var(--primary);
}

.nb-lang-selector option {
  background: var(--surface);
  color: var(--text);
}

.nb-sidebar-actions {
  display: flex;
  gap: 4px;
}

#nbToggleActions {
  display: inline-block;
}

.nb-section-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.nb-section {
  border-bottom: 1px solid var(--border);
}

.nb-section.active>.nb-section-header {
  background: var(--surface);
  color: var(--text);
  border-left: 4px solid var(--primary);
  padding-left: 12px;
  box-shadow: inset 1px 0 0 rgba(0, 0, 0, .08);
}

[data-theme="dark"] .nb-section.active>.nb-section-header {
  box-shadow: inset 1px 0 0 rgba(255, 255, 255, .08);
}

.nb-section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  cursor: pointer;
  font-weight: 700;
  font-size: .88rem;
  transition: background var(--transition);
  position: relative;
}

.nb-section-header:hover {
  background: var(--surface);
}

.nb-section-toggle {
  font-size: .7rem;
  color: var(--text-faint);
  width: 14px;
  text-align: center;
  flex-shrink: 0;
}

.nb-section-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nb-section-actions {
  display: flex;
  gap: 2px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%) translateX(16px);
  padding-left: 28px;
  background: linear-gradient(to left, color-mix(in srgb, var(--surface-2) 97%, transparent), color-mix(in srgb, var(--surface-2) 60%, transparent), transparent);
}

.nb-section-add-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: .75rem;
  padding: 2px 4px;
  border-radius: 4px;
  opacity: .6;
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
  line-height: 1;
  flex-shrink: 0;
  transform: translateX(0);
}

.nb-section-add-btn:hover {
  opacity: 1;
  background: var(--surface-2);
}

.nb-section-color-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-right: 4px;
  border: 1px solid var(--border);
}

.nb-page-color-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-right: 2px;
  border: 1px solid var(--border);
}

.nb-page-list {
  padding-left: 20px;
}

.nb-page-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px 7px 8px;
  cursor: pointer;
  font-size: .84rem;
  border-left: 3px solid transparent;
  transition: background var(--transition), border-color var(--transition);
  position: relative;
}

.nb-page-item:hover {
  background: var(--surface);
}

.nb-page-item.active {
  background: var(--surface);
  border-left-color: var(--primary);
  border-left-width: 4px;
  color: var(--primary);
  font-weight: 700;
}

.nb-page-name {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
}

.nb-page-actions {
  display: flex;
  gap: 2px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%) translateX(16px);
  padding-left: 28px;
  background: linear-gradient(to left, rgba(255, 255, 255, 0.97) 80%, rgba(255, 255, 255, 0.8) 60%, transparent);
}

[data-theme="dark"] .nb-page-actions {
  background: linear-gradient(to left, rgba(30, 30, 30, 0.97) 80%, rgba(30, 30, 30, 0.8) 60%, transparent);
}

.nb-actions-open .nb-page-actions {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(-50%) translateX(0);
}

.nb-actions-open .nb-section-actions {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(-50%) translateX(0);
}

.nb-actions-open .nb-section-add-btn {
  opacity: 0;
  pointer-events: none;
  width: 0;
  min-width: 0;
  padding: 2px 0;
  overflow: hidden;
  transform: translateX(0);
}

.nb-context-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: .7rem;
  padding: 2px 4px;
  border-radius: 4px;
  opacity: .85;
  transition: opacity var(--transition), background var(--transition);
  color: var(--text-muted);
  filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.3));
}

[data-theme="dark"] .nb-context-btn {
  color: var(--text);
  filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.5));
}

.nb-context-btn:hover {
  opacity: 1;
  background: var(--surface-2);
  color: var(--text);
}

[data-theme="dark"] .nb-context-btn:hover {
  background: var(--surface);
}

/* ── Main editor area ────────────────────────────────────── */
.nb-main {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.nb-welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 40px;
  color: var(--text-muted);
}

.nb-welcome-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.nb-welcome h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
}

.nb-welcome p {
  max-width: 400px;
  line-height: 1.6;
}

.nb-editor-area {
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
}

/* ── Read header ──────────────────────────────────────────── */
.nb-read-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 12px;
}

.nb-read-title {
  font-size: 1.3rem;
  font-weight: 900;
  margin: 0;
  color: var(--text);
  line-height: 1.3;
}

.nb-read-header .nb-page-meta {
  display: block;
  margin-top: 2px;
}

.nb-editor[contenteditable="false"] {
  opacity: 0.85;
}

.nb-editor-readonly {
  cursor: default;
  user-select: text;
}

.nb-editor-readonly a {
  pointer-events: auto;
}

/* ── Toolbar ──────────────────────────────────────────────── */
.nb-editor-toolbar {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 8px 16px;
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  flex-wrap: wrap;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.nb-tb-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: .82rem;
  color: var(--text-muted);
  transition: all var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.nb-tb-btn:hover {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}

.nb-tb-btn:active {
  background: var(--primary-bg);
  color: var(--primary-dk);
}

.nb-tb-btn.active {
  background: var(--primary-bg);
  color: var(--primary-dk);
  border-color: var(--primary);
}

.nb-tb-sep {
  width: 1px;
  height: 22px;
  background: var(--border);
  margin: 0 4px;
  flex-shrink: 0;
}

.nb-color-picker {
  width: 28px;
  height: 28px;
  border: none;
  padding: 0;
  cursor: pointer;
  border-radius: 4px;
  background: none;
}

.nb-font-size {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 6px;
  font-size: .8rem;
  cursor: pointer;
}

/* ── Page header ──────────────────────────────────────────── */
.nb-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 12px;
}

.nb-page-title-input {
  font-size: 1.3rem;
  font-weight: 900;
  border: none;
  background: none;
  color: var(--text);
  outline: none;
  flex: 1;
  min-width: 0;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background var(--transition);
}

.nb-page-title-input:focus {
  background: var(--surface-2);
}

.nb-page-meta {
  font-size: .75rem;
  color: var(--text-faint);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Editor content ───────────────────────────────────────── */
.nb-editor {
  flex: 1;
  padding: 24px 32px;
  overflow-y: auto;
  line-height: 1.7;
  font-size: 1rem;
  outline: none;
  min-height: 200px;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.nb-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--text-faint);
  font-style: italic;
}

.nb-editor h1 {
  font-size: 2rem;
  font-weight: 900;
  margin: 20px 0 10px;
}

.nb-editor h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 18px 0 8px;
}

.nb-editor h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 16px 0 6px;
}

.nb-editor h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 14px 0 4px;
}

.nb-editor p {
  margin: 6px 0;
}

.nb-editor ul,
.nb-editor ol {
  margin: 8px 0;
  padding-left: 24px;
}

.nb-editor li {
  margin: 4px 0;
}

.nb-editor blockquote {
  margin: 12px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--primary);
  background: var(--surface-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
  font-style: italic;
}

.nb-editor pre {
  margin: 12px 0;
  padding: 16px;
  background: #1e1e2e;
  color: #cdd6f4;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: .88rem;
  line-height: 1.5;
}

[data-theme="dark"] .nb-editor pre {
  background: #11111b;
  color: #cdd6f4;
}

.nb-editor pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.nb-editor hr {
  border: none;
  border-top: 2px solid var(--border);
  margin: 20px 0;
}

/* Task list */
.nb-editor ul.nb-task-list,
.nb-editor ul.nb-task-list ul {
  list-style: none;
  padding-left: 0;
}

.nb-editor ul.nb-task-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 6px 0;
}

.nb-task-checkbox {
  margin-top: 5px;
  flex-shrink: 0;
  cursor: pointer;
  accent-color: var(--primary);
  user-select: none;
}

/* Page links */
.nb-page-link {
  color: var(--info);
  text-decoration: underline;
  text-decoration-style: dotted;
  cursor: pointer;
  font-weight: 600;
  transition: color var(--transition);
}

.nb-page-link:hover {
  color: var(--primary);
}

/* ── Editor images ──────────────────────────────────────────── */
.nb-editor .nb-editor-image {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 12px 0;
  display: block;
  cursor: default;
  user-select: none;
  -webkit-user-select: none;
}

.nb-editor[contenteditable="true"] .nb-editor-image:hover {
  outline: 2px dashed var(--primary);
  outline-offset: 2px;
}

/* ── Image resize handles ──────────────────────────────────── */
.nb-image-resize-overlay {
  position: absolute;
  pointer-events: none;
  z-index: 10;
  display: none;
}

.nb-image-resize-overlay.visible {
  display: block;
}

.nb-image-resize-handle {
  position: absolute;
  width: 10px;
  height: 10px;
  background: var(--primary);
  border: 2px solid #fff;
  border-radius: 2px;
  pointer-events: all;
  cursor: pointer;
  z-index: 11;
  outline: none !important;
}

.nb-image-resize-handle[data-pos="nw"] {
  top: -7px;
  left: -7px;
  cursor: nw-resize;
}

.nb-image-resize-handle[data-pos="n"] {
  top: -7px;
  left: calc(50% - 7px);
  cursor: n-resize;
}

.nb-image-resize-handle[data-pos="ne"] {
  top: -7px;
  right: -7px;
  cursor: ne-resize;
}

.nb-image-resize-handle[data-pos="e"] {
  top: calc(50% - 7px);
  right: -7px;
  cursor: e-resize;
}

.nb-image-resize-handle[data-pos="se"] {
  bottom: -7px;
  right: -7px;
  cursor: se-resize;
}

.nb-image-resize-handle[data-pos="s"] {
  bottom: -7px;
  left: calc(50% - 7px);
  cursor: s-resize;
}

.nb-image-resize-handle[data-pos="sw"] {
  bottom: -7px;
  left: -7px;
  cursor: sw-resize;
}

.nb-image-resize-handle[data-pos="w"] {
  top: calc(50% - 7px);
  left: -7px;
  cursor: w-resize;
}

/* ── Editor tables ─────────────────────────────────────────── */
.nb-editor .nb-editor-table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
  font-size: .92rem;
}

.nb-editor .nb-editor-table th,
.nb-editor .nb-editor-table td {
  border: 2px solid var(--border);
  padding: 8px 12px;
  min-width: 60px;
  text-align: left;
  box-sizing: border-box;
}

.nb-editor .nb-editor-table th {
  background: var(--surface-2);
  font-weight: 700;
}

.nb-editor .nb-editor-table td {
  background: var(--surface);
}

.nb-editor .nb-editor-table .nb-cell-deleted {
  border: none !important;
  background: transparent !important;
}

.nb-table-wrapper {
  margin: 12px 0;
  position: relative;
}

.nb-table-toolbar {
  display: none;
  gap: 4px;
  padding: 4px 0;
  margin-bottom: 4px;
}

.nb-table-toolbar.visible {
  display: flex;
}

.nb-table-toolbar .nb-tb-btn {
  font-size: .75rem;
  padding: 2px 8px;
}

/* ── Table resize handles ────────────────────────────────────── */
.nb-col-resize-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  right: -4px;
  width: 9px;
  cursor: col-resize;
  z-index: 10;
  background: transparent;
  pointer-events: all;
}

.nb-col-resize-handle::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 4px;
  width: 1px;
  background: transparent;
  transition: background .15s;
}

.nb-col-resize-handle:hover::after,
.nb-col-resize-handle.active::after,
.nb-col-resize-handle.col-hover::after {
  background: var(--primary);
}

.nb-editor-readonly .nb-col-resize-handle {
  pointer-events: none;
}

.nb-row-resize-handle {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 9px;
  cursor: row-resize;
  z-index: 10;
  background: transparent;
  pointer-events: all;
}

.nb-row-resize-handle::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 4px;
  height: 1px;
  background: transparent;
  transition: background .15s;
}

.nb-row-resize-handle:hover::after,
.nb-row-resize-handle.active::after,
.nb-row-resize-handle.row-hover::after {
  background: var(--primary);
}

.nb-editor-readonly .nb-row-resize-handle {
  pointer-events: none;
}

/* ── Editor footer ─────────────────────────────────────────── */
.nb-editor-footer {
  display: flex;
  align-items: center;
  padding: 8px 24px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.nb-editor-footer-left {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
}

.nb-editor-footer-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

#nbEditorStatus {
  font-size: .75rem;
  color: var(--text-faint);
}


#nbDeletePage {
  font-size: .75rem;
  padding: 4px 10px;
  opacity: 0.6;
  transition: opacity var(--transition);
}

#nbDeletePage:hover {
  opacity: 1;
}

#nbExportPage {
  font-size: .75rem;
  padding: 4px 10px;
}

/* ── Search box ────────────────────────────────────────────── */
.nb-search-box {
  padding: 10px 16px;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}

.nb-search-box input {
  width: 100%;
  padding: 8px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .85rem;
  background: var(--surface);
  color: var(--text);
  outline: none;
}

.nb-search-box input:focus {
  border-color: var(--primary);
}

.nb-search-results {
  max-height: 300px;
  overflow-y: auto;
  margin-top: 8px;
}

.nb-search-results.has-results {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.nb-search-empty,
.nb-search-item {
  padding: 8px 12px;
  font-size: .82rem;
}

.nb-search-empty {
  color: var(--text-faint);
  font-style: italic;
}

.nb-search-item {
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nb-search-item:last-child {
  border-bottom: none;
}

.nb-search-item:hover {
  background: var(--surface-2);
}

.nb-search-item-title {
  font-weight: 700;
  color: var(--text);
}

.nb-search-item-section {
  font-size: .75rem;
  color: var(--text-faint);
}

.nb-search-item-snippet {
  font-size: .78rem;
  color: var(--text-muted);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nb-search-item mark {
  background: var(--warning);
  color: #000;
  border-radius: 2px;
  padding: 0 2px;
}

/* ── Notebook modal base overlay ──────────────────────────── */
.nb-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 600;
  padding: 20px;
}

.nb-modal-dialog {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  max-width: 450px;
  width: 100%;
}

.nb-modal-dialog h3 {
  font-size: 1rem;
  margin-bottom: 16px;
  font-weight: 700;
}

/* ── Vocabulary notebook links (on vocab cards) ────────────── */
.vocab-notebook-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
}

.vocab-notebook-link {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: .75rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}

.vocab-notebook-link:hover {
  background: var(--primary-bg-correct);
  border-color: var(--primary);
  color: var(--primary);
}

.vocab-notebook-link-del {
  font-size: .65rem;
  margin-left: 2px;
  opacity: .5;
  cursor: pointer;
  line-height: 1;
}

.vocab-notebook-link-del:hover {
  opacity: 1;
  color: var(--danger);
}

/* ── Modal search inputs (notebook page link + vocab link) ─── */
#nbLinkSearch,
#nbVocabLinkSearch,
#vocabLinkSearch {
  width: 100%;
  padding: 8px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .85rem;
  background: var(--surface);
  color: var(--text);
  outline: none;
  margin: 8px 0;
  box-sizing: border-box;
}

#vocabLinkSearch:focus {
  border-color: var(--primary);
}

/* ── Vocab link page picker (in vocabulary) ────────────────── */
.vocab-link-page-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background var(--transition);
}

.vocab-link-page-item:hover {
  background: var(--surface-2);
}

.vocab-link-page-item.linked {
  background: var(--primary-bg-correct);
}

.vocab-link-page-check {
  width: 20px;
  text-align: center;
  font-weight: 700;
  color: var(--primary);
  flex-shrink: 0;
}

.vocab-link-page-section {
  font-size: .72rem;
  color: var(--text-faint);
}

.vocab-link-page-name {
  font-size: .85rem;
  color: var(--text);
  flex: 1;
}

/* ── Notebook: Linked vocabulary section ───────────────────── */
.nb-vocab-links-section {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

.nb-vocab-links-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.nb-vocab-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 28px;
}

.nb-vocab-links-empty {
  font-size: .78rem;
  color: var(--text-faint);
  font-style: italic;
}

.nb-vocab-link-chip {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: .78rem;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--primary-bg-correct);
  border: 1px solid var(--primary);
  color: var(--primary);
}

.nb-vocab-link-chip-text {
  cursor: pointer;
  transition: opacity var(--transition);
}

.nb-vocab-link-chip-text:hover {
  opacity: .7;
}

.nb-vocab-link-chip-del {
  font-size: .65rem;
  margin-left: 2px;
  opacity: .5;
  cursor: pointer;
  line-height: 1;
}

.nb-vocab-link-chip-del:hover {
  opacity: 1;
  color: var(--danger);
}

/* ── Vocab link picker items (in notebook) ─────────────────── */
.nb-vocab-link-item .nb-link-check {
  width: 20px;
  text-align: center;
  font-weight: 700;
  color: var(--primary);
  flex-shrink: 0;
}

.nb-vocab-link-item.linked {
  background: var(--primary-bg-correct);
}

/* ── Table size picker modal ───────────────────────────────── */
.nb-table-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 600;
  padding: 20px;
}

.nb-table-modal-content {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.nb-table-modal-content h3 {
  margin-bottom: 16px;
  font-size: 1rem;
}

.nb-table-size-picker {
  display: flex;
  justify-content: center;
  margin-bottom: 12px;
}

.nb-table-grid {
  display: grid;
  grid-template-columns: repeat(10, 20px);
  gap: 2px;
}

.nb-table-grid-cell {
  width: 20px;
  height: 20px;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--surface-2);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.nb-table-grid-cell.selected {
  background: var(--primary);
  border-color: var(--primary);
}

.nb-table-grid-cell:hover {
  border-color: var(--primary);
}

#nbTableSizeLabel {
  color: var(--text-muted);
  font-size: .85rem;
  margin-bottom: 16px;
}

.nb-table-modal-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* ── Link picker modal ─────────────────────────────────────── */
.nb-link-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 600;
  padding: 20px;
}

.nb-link-modal-content {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  min-width: 320px;
  max-width: 450px;
  width: 100%;
}

.nb-link-modal-content h3 {
  margin-bottom: 12px;
  font-size: 1rem;
}

.nb-link-modal-content input {
  width: 100%;
  padding: 8px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .85rem;
  background: var(--surface-2);
  color: var(--text);
  outline: none;
  margin-bottom: 12px;
}

.nb-link-modal-content input:focus {
  border-color: var(--primary);
}

.nb-link-results {
  max-height: 240px;
  overflow-y: auto;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.nb-link-empty {
  padding: 16px;
  text-align: center;
  color: var(--text-faint);
  font-style: italic;
  font-size: .85rem;
}

.nb-link-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nb-link-item:last-child {
  border-bottom: none;
}

.nb-link-item:hover {
  background: var(--surface-2);
}

.nb-link-section {
  font-size: .72rem;
  color: var(--text-faint);
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  white-space: nowrap;
}

.nb-link-name {
  font-weight: 600;
  color: var(--text);
}

.nb-link-modal-actions {
  display: flex;
  justify-content: flex-end;
}

/* ── Color picker modal ──────────────────────────────────── */
.nb-color-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.nb-color-swatch {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color var(--transition), transform var(--transition);
}

.nb-color-swatch:hover {
  transform: scale(1.15);
}

.nb-color-swatch.selected {
  border-color: var(--text);
  transform: scale(1.1);
}

[data-theme="dark"] .nb-color-swatch.selected {
  border-color: #fff;
}

.nb-color-remove {
  display: block;
  width: 100%;
  padding: 6px;
  text-align: center;
  font-size: .82rem;
  color: var(--text-faint);
  cursor: pointer;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: none;
  margin-bottom: 16px;
  transition: all var(--transition);
}

.nb-color-remove:hover {
  color: var(--danger);
  border-color: var(--danger);
}

/* ── Custom color button ──────────────────────────────────── */
.nb-color-custom-row {
  margin-bottom: 16px;
}

.nb-color-custom-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 12px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: .85rem;
  color: var(--text-muted);
  transition: all var(--transition);
  position: relative;
}

.nb-color-custom-btn:hover {
  border-color: var(--primary);
  color: var(--text);
  background: var(--surface-2);
}

.nb-color-custom-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  border: none;
  padding: 0;
}

/* ── Notebook responsive ───────────────────────────────────── */
@media (max-width: 768px) {
  .notebook-layout {
    flex-direction: column;
    min-height: calc(100dvh - var(--nav-h) - 60px);
  }

  .nb-sidebar {
    width: 100%;
    min-width: 0;
    max-height: 250px;
    border-right: none;
    border-bottom: 2px solid var(--border);
  }

  .nb-sidebar-toggle {
    order: -1;
    border-top: none;
    border-bottom: 2px solid var(--border);
  }

  .nb-sidebar-collapsed .nb-sidebar {
    max-height: none;
    width: 100%;
    min-width: 0;
    padding: 0;
    overflow: visible;
    opacity: 1;
    border-bottom: 2px solid var(--border);
  }

  .nb-sidebar-collapsed .nb-sidebar-header,
  .nb-sidebar-collapsed .nb-search-box,
  .nb-sidebar-collapsed .nb-section-list {
    display: none;
  }

  .nb-main {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
  }

  .nb-editor-area {
    flex: 1;
    min-height: 0;
  }

  .nb-editor {
    padding: 16px;
    min-height: 0;
  }

  .nb-editor-toolbar {
    padding: 6px 10px;
    gap: 2px;
  }

  .nb-page-header {
    padding: 10px 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .nb-page-meta {
    font-size: .7rem;
  }

  /* Sticky footer on mobile */
  .nb-editor-footer {
    position: sticky;
    bottom: 0;
    z-index: 10;
  }
}

/* ── Vocabulary sidebar (right panel) ──────────────────────── */
.nb-vocab-sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--surface-2);
  border-left: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width .25s ease, min-width .25s ease, opacity .25s ease;
}

.nb-vocab-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.nb-vocab-sidebar-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.nb-vocab-sidebar-header span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nb-vocab-sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 6px;
  background: var(--surface-2);
  border: none;
  border-top: 2px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  font-size: .85rem;
  flex-shrink: 0;
  transition: color var(--transition), background var(--transition);
}

.nb-vocab-sidebar-toggle:hover {
  color: var(--text);
  background: var(--border);
}

.nb-vocab-sidebar .nb-vocab-links-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 28px;
}

.nb-vocab-sidebar .nb-vocab-links-empty {
  font-size: .78rem;
  color: var(--text-faint);
  font-style: italic;
}

.nb-vocab-sidebar .nb-vocab-link-chip {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: .78rem;
  padding: 4px 10px;
  border-radius: 12px;
  background: var(--surface-2);
  border: 1px solid var(--primary);
  color: var(--primary);
}

.nb-vocab-type-sep {
  height: 1px;
  background: var(--border);
  margin: 6px 0;
}

.nb-vocab-sidebar .nb-vocab-link-chip-text {
  flex: 1;
  cursor: pointer;
  transition: opacity var(--transition);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nb-vocab-sidebar .nb-vocab-link-chip-text:hover {
  opacity: .7;
}

.nb-vocab-sidebar .nb-vocab-link-chip-del {
  font-size: .65rem;
  opacity: .5;
  cursor: pointer;
  line-height: 1;
  flex-shrink: 0;
  padding: 2px;
}

.nb-vocab-sidebar .nb-vocab-link-chip-del:hover {
  opacity: 1;
  color: var(--danger);
}

.nb-vocab-chip-cb {
  cursor: pointer;
  flex-shrink: 0;
  font-size: .85rem;
  line-height: 1;
  opacity: .7;
  transition: opacity var(--transition);
}

.nb-vocab-chip-cb:hover {
  opacity: 1;
}

.nb-vocab-chip-cb.checked {
  opacity: 1;
}

/* Select mode: hide ✕, tint chips */
.nb-vocab-link-chip.nb-select-mode .nb-vocab-link-chip-del {
  display: none;
}

.nb-vocab-link-chip.nb-select-mode {
  opacity: .55;
  border-color: var(--border);
  transition: opacity var(--transition), border-color var(--transition), background var(--transition);
}

.nb-vocab-link-chip.nb-select-mode.nb-chip-selected {
  opacity: 1;
  border-color: var(--primary);
  background: var(--primary-bg);
  color: var(--text);
}

.nb-vocab-sidebar-reopen {
  position: absolute;
  right: 0;
  top: 50%;
  z-index: 20;
  width: 20px;
  height: 52px;
  border-radius: 6px 0 0 6px;
  background: var(--surface-2);
  border: 2px solid var(--border);
  border-right: none;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: .7rem;
  transform: translateY(-50%);
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  box-shadow: -2px 0 6px rgba(0, 0, 0, .06);
}

.nb-vocab-sidebar-reopen:hover {
  color: var(--text);
  background: var(--border);
  border-color: var(--text-muted);
}

[data-theme="dark"] .nb-vocab-sidebar-reopen {
  box-shadow: -2px 0 8px rgba(0, 0, 0, .25);
}

.nb-vocab-sidebar-collapsed .nb-vocab-sidebar {
  width: 0;
  min-width: 0;
  overflow: hidden;
  border-left: none;
  padding: 0;
  opacity: 0;
}

@media (max-width: 768px) {
  .nb-vocab-sidebar {
    width: 100%;
    min-width: 0;
    max-height: 250px;
    border-left: none;
    border-top: 2px solid var(--border);
  }

  .nb-vocab-sidebar-toggle {
    order: -1;
    border-top: none;
    border-bottom: 2px solid var(--border);
  }

  .nb-vocab-sidebar-collapsed .nb-vocab-sidebar {
    max-height: none;
    width: 100%;
    min-width: 0;
    padding: 0;
    overflow: visible;
    opacity: 1;
    border-top: 2px solid var(--border);
  }

  .nb-vocab-sidebar-collapsed .nb-vocab-sidebar-header,
  .nb-vocab-sidebar-collapsed .nb-vocab-links-list {
    display: none;
  }

  .nb-vocab-sidebar-reopen {
    display: none;
  }
}

/* ── Phosphor icon system ────────────────────────────────────────────────── */
/* Icon glyphs inherit the surrounding text color so they stay visible on any
   surface (nav links, buttons, toasts). Semantic .ph-ok/.ph-bad/.ph-warn
   classes still override with their meaning-specific colors. */
body.icon-icons .ph,
body.icon-icons .ph-bold,
body.icon-icons .ph-fill,
body.icon-none .ph,
body.icon-none .ph-bold,
body.icon-none .ph-fill {
  display: inline-block;
  font-style: normal;
  line-height: 1;
  vertical-align: middle;
  color: inherit;
  /* Phosphor glyphs read ~20% smaller than emoji at the same font-size, so
     scale them up slightly to match the emoji visual size. */
  font-size: 1.2em;
}

body.icon-icons .ph.ph-ok,
body.icon-icons .ph-bold.ph-ok,
body.icon-icons .ph-fill.ph-ok,
body.icon-none .ph.ph-ok,
body.icon-none .ph-bold.ph-ok,
body.icon-none .ph-fill.ph-ok {
  color: #2ecc71;
}

body.icon-icons .ph.ph-bad,
body.icon-icons .ph-bold.ph-bad,
body.icon-icons .ph-fill.ph-bad,
body.icon-none .ph.ph-bad,
body.icon-none .ph-bold.ph-bad,
body.icon-none .ph-fill.ph-bad {
  color: var(--danger);
}

body.icon-icons .ph.ph-warn,
body.icon-icons .ph-bold.ph-warn,
body.icon-icons .ph-fill.ph-warn,
body.icon-none .ph.ph-warn,
body.icon-none .ph-bold.ph-warn,
body.icon-none .ph-fill.ph-warn {
  color: var(--warning);
}

/* "Colorful" icon mode (iconColor: accent): icons follow the accent color
   everywhere EXCEPT on surfaces that already use an accent-tinted background
   (active nav, primary buttons, active seg buttons, etc.) where the icon must
   keep the surface's text color to stay readable.
   Semantic .ph-ok/.ph-bad/.ph-warn are excluded so meaning colors are kept. */
body.icon-icons.icon-color-accent .ph:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .ph-bold:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .ph-fill:not(.ph-ok):not(.ph-bad):not(.ph-warn) {
  color: var(--primary);
}

body.icon-icons.icon-color-accent .nav-link.active .ph:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nav-link.active .ph-bold:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nav-link.active .ph-fill:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .active .ph:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .active .ph-bold:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .active .ph-fill:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .btn-primary .ph:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .btn-primary .ph-bold:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .btn-primary .ph-fill:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nb-tb-btn .ph:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nb-tb-btn .ph-bold:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nb-tb-btn .ph-fill:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nb-context-btn .ph:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nb-context-btn .ph-bold:not(.ph-ok):not(.ph-bad):not(.ph-warn),
body.icon-icons.icon-color-accent .nb-context-btn .ph-fill:not(.ph-ok):not(.ph-bad):not(.ph-warn) {
  color: inherit;
}

/* Segmented control used in onboarding + settings for icon style / weight */
.seg-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.seg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 38px;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-family: inherit;
  font-size: .9rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.seg-btn:hover {
  border-color: var(--primary);
}

.seg-btn.active {
  border-color: var(--primary);
  background: var(--primary-bg);
  color: var(--primary-dk);
}

/* ── EXAM MODE ───────────────────────────────────────────────── */

/* Animated waveform bars for audio listening questions */
.waveform-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  height: 48px;
  padding: 12px 20px;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.waveform-container:hover {
  border-color: var(--primary);
}

.waveform-container.playing {
  border-color: var(--primary);
  background: var(--primary-bg-correct);
}

.waveform-bar {
  width: 4px;
  border-radius: 2px;
  background: var(--primary);
  animation: waveformPulse 0.8s ease-in-out infinite;
  animation-play-state: paused;
  transform: scaleY(0.3);
}

.waveform-bar:nth-child(1) { height: 60%; animation-delay: 0s; }
.waveform-bar:nth-child(2) { height: 100%; animation-delay: 0.1s; }
.waveform-bar:nth-child(3) { height: 40%; animation-delay: 0.2s; }
.waveform-bar:nth-child(4) { height: 80%; animation-delay: 0.15s; }
.waveform-bar:nth-child(5) { height: 55%; animation-delay: 0.25s; }
.waveform-bar:nth-child(6) { height: 90%; animation-delay: 0.05s; }
.waveform-bar:nth-child(7) { height: 45%; animation-delay: 0.3s; }

@keyframes waveformPulse {
  0%, 100% { transform: scaleY(0.3); }
  50% { transform: scaleY(1); }
}

.waveform-container.playing .waveform-bar {
  animation-play-state: running;
}

.waveform-label {
  font-size: .82rem;
  color: var(--text-muted);
  margin-top: 6px;
  text-align: center;
}

/* Exam choices (vertical list for audio, 2-col grid for word) */
.exam-choices-vertical {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.exam-choices-vertical .choice-btn {
  width: 100%;
  text-align: left;
  font-size: 1.1rem;
  padding: 14px 16px;
}

/* Exam progress bar */
.exam-progress-bar-wrap {
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  margin-bottom: 20px;
  overflow: hidden;
}

.exam-progress-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--primary);
  transition: width 0.3s ease;
}

/* Exam result card */
.exam-result-card {
  text-align: center;
  padding: 32px;
}

.exam-result-score {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 4px;
}

.exam-result-pct {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.exam-result-score.good { color: var(--primary); }
.exam-result-score.ok { color: var(--warning); }
.exam-result-score.bad { color: var(--danger); }

.exam-result-breakdown {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1rem;
  font-weight: 600;
}

/* Exam history */
.exam-history {
  margin-top: 24px;
  text-align: left;
}

.exam-history h4 {
  font-size: .9rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.exam-history-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 240px;
  overflow-y: auto;
}

.exam-history-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: .85rem;
}

.exam-history-item .exam-h-date {
  color: var(--text-faint);
  min-width: 80px;
}

.exam-history-item .exam-h-score {
  font-weight: 700;
  min-width: 50px;
}

.exam-history-item .exam-h-pct {
  font-weight: 700;
}

.exam-history-item .exam-h-pct.good { color: var(--primary); }
.exam-history-item .exam-h-pct.ok { color: var(--warning); }
.exam-history-item .exam-h-pct.bad { color: var(--danger); }

@media (max-width: 600px) {
  .exam-result-score { font-size: 2.5rem; }
  .exam-result-breakdown { gap: 14px; font-size: .9rem; }
}

/* ── Exam audio matching grid (5 sounds ↔ 5 answers, 2 columns × 5 rows) ────── */
.exam-match-grid {
  --exam-match-split: calc(50% + 5px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-auto-rows: 1fr;
  gap: 10px;
  width: 100%;
  margin-top: 6px;
  background-image: linear-gradient(
    to right,
    transparent calc(var(--exam-match-split) - 0.5px),
    var(--border) var(--exam-match-split),
    transparent calc(var(--exam-match-split) + 0.5px)
  );
}

.exam-sound-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 56px;
  padding: 10px 14px;
  background: var(--surface-2);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.exam-sound-btn:hover {
  border-color: var(--primary);
}

.exam-sound-btn.active {
  border-color: var(--primary);
  background: var(--primary-bg);
  box-shadow: 0 0 0 3px var(--primary-bg-correct);
}

.exam-sound-btn.matched {
  opacity: .6;
}

.exam-sound-btn.matched.correct {
  opacity: 1;
  border-color: var(--primary);
  background: var(--primary-bg-correct);
}

.exam-sound-btn.matched.wrong {
  opacity: 1;
  border-color: var(--danger);
  background: var(--danger-bg);
}

.exam-sound-num {
  min-width: 24px;
  height: 24px;
  padding: 0 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-weight: 700;
  border-radius: 50%;
  background: var(--primary-bg);
  color: var(--primary-dk);
  flex-shrink: 0;
}

.exam-sound-btn.matched.wrong .exam-sound-num {
  background: var(--danger-bg);
  color: var(--danger-dk);
}

.exam-sound-btn .waveform-container {
  flex: 1;
  width: 100%;
  height: 32px;
  padding: 6px 12px;
  justify-content: space-evenly;
  cursor: pointer;
}

.exam-sound-btn .waveform-bar {
  width: 5px;
}

.exam-sound-btn.active .waveform-container,
.exam-sound-btn .waveform-container.playing {
  background: var(--surface);
  border-color: var(--primary);
}

.exam-sound-btn.active .waveform-container .waveform-bar,
.exam-sound-btn .waveform-container.playing .waveform-bar {
  background: var(--primary);
}

.exam-sound-btn.matched.correct .waveform-bar { background: var(--primary); }
.exam-sound-btn.matched.wrong .waveform-bar { background: var(--danger); }

.exam-match-answer {
  width: 100%;
  text-align: left;
  font-size: 1.05rem;
  line-height: 1.3;
  padding: 12px 16px;
  min-height: 56px;
  overflow-wrap: anywhere;
}

.exam-match-answer.matched {
  opacity: .55;
}

.exam-match-answer.matched.correct {
  opacity: 1;
}

.exam-match-answer.matched.wrong {
  opacity: 1;
}

@media (max-width: 600px) {
  .exam-match-grid {
    --exam-match-split: calc(40% + 4px);
    grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
    gap: 8px;
  }
  .exam-sound-btn {
    min-height: 48px;
    gap: 8px;
    padding: 8px 10px;
  }
  .exam-sound-btn .waveform-container {
    height: 28px;
    padding: 5px 8px;
  }
  .exam-sound-btn .waveform-bar {
    width: 3px;
  }
  .exam-sound-num {
    min-width: 20px;
    height: 20px;
    font-size: .72rem;
  }
  .exam-match-answer {
    font-size: .92rem;
    line-height: 1.25;
    padding: 10px 12px;
    min-height: 48px;
  }
}