:root {
  --primary: #3ecf8e;
  --primary-deep: #24b47e;
  --ink: #171717;
  --ink-secondary: #212121;
  --ink-mute: #707070;
  --ink-mute-2: #9a9a9a;
  --on-primary: #171717;
  --on-dark: #ffffff;
  --canvas: #ffffff;
  --canvas-soft: #fafafa;
  --canvas-night: #1c1c1c;
  --hairline: #dfdfdf;
  --hairline-strong: #c7c7c7;
  --hairline-cool: #ededed;
  --accent-violet: #644fc1;
  --accent-yellow: #ffdb13;
  --danger: #ff2201;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", "Noto Sans Thai", "Segoe UI", sans-serif;
  background: var(--canvas-soft);
  color: var(--ink);
  line-height: 1.6;
}

header.site-header {
  background: var(--canvas);
  color: var(--ink);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--hairline);
}

header.site-header .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
}

header.site-header .brand .flag { font-size: 1.4rem; }

#menuToggle {
  display: none;
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  color: var(--ink);
  font-size: 1.2rem;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.overall-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  min-width: 200px;
}

.progress-track {
  flex: 1;
  height: 10px;
  background: var(--hairline-cool);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
}

.layout {
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  align-items: flex-start;
}

nav.sidebar {
  width: 300px;
  flex-shrink: 0;
  padding: 20px 14px;
  position: sticky;
  top: 66px;
  max-height: calc(100vh - 66px);
  overflow-y: auto;
}

.module-group {
  margin-bottom: 8px;
}

.module-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  font-weight: 700;
  margin: 18px 8px 6px;
}

.stage-title {
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--ink);
  margin: 22px 8px 4px;
  padding-top: 10px;
  border-top: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.stage-title:first-of-type { border-top: none; padding-top: 0; }

.stage-level {
  font-size: 0.68rem;
  background: var(--hairline-cool);
  color: var(--ink-mute);
  padding: 1px 7px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.stage-count {
  font-size: 0.7rem;
  color: var(--ink-mute);
  font-weight: 600;
  margin-left: auto;
}

.lesson-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
  margin-bottom: 3px;
  transition: background 0.15s ease;
}

.lesson-link:hover { background: var(--canvas-soft); }

.lesson-link.active {
  background: rgba(62,207,142,0.1);
  color: var(--ink);
  font-weight: 600;
  border-left: 3px solid var(--primary);
  padding-left: 9px;
}

.lesson-link .badge {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--hairline);
  color: var(--ink-mute);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.lesson-link.done .badge {
  background: var(--primary);
  color: var(--on-primary);
}

.lesson-link.active .badge {
  background: var(--primary);
  color: var(--on-primary);
}

main.content {
  flex: 1;
  padding: 24px 28px 60px;
  min-width: 0;
}

.card {
  background: var(--canvas);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 20px;
  border: 1px solid var(--hairline);
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}

.hero {
  background: var(--canvas-soft);
  color: var(--ink);
  border: 1px solid var(--hairline);
}

.hero h1 { margin-top: 0; font-size: 1.8rem; }
.hero p { color: var(--ink-mute); }

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.streak-badge {
  display: inline-block;
  background: rgba(62,207,142,0.12);
  border: 1px solid rgba(62,207,142,0.3);
  color: var(--primary-deep);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.btn-on-hero {
  background: var(--canvas);
  border-color: var(--hairline-strong);
  color: var(--ink);
}
.btn-on-hero:hover { background: var(--canvas-soft); }

.stage-desc {
  color: var(--ink-mute);
  font-size: 0.9rem;
  margin: -6px 0 4px;
}

.module-overview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.module-card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.module-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(23,23,23,0.08);
}

.module-card .m-tag {
  font-size: 0.72rem;
  color: var(--ink-mute);
  font-weight: 700;
  text-transform: uppercase;
}

.module-card h3 { margin: 6px 0 4px; font-size: 1.02rem; }
.module-card p.sub { color: var(--ink-mute); font-size: 0.85rem; margin: 0 0 10px; }

.mini-progress {
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--hairline);
  overflow: hidden;
}
.mini-progress span {
  display: block;
  height: 100%;
  background: var(--primary);
}

.pill {
  display: inline-block;
  font-size: 0.72rem;
  padding: 2px 9px;
  border-radius: var(--radius-full);
  background: rgba(62,207,142,0.12);
  color: var(--primary-deep);
  font-weight: 700;
  margin-top: 8px;
}

.lesson-header .module-tag {
  color: var(--ink-mute);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
}

.lesson-header h1 { margin: 4px 0 6px; }
.lesson-header .th-title { color: var(--ink-mute); font-size: 1.05rem; margin: 0 0 10px; }
.objective-box {
  background: var(--canvas-soft);
  border-left: 4px solid var(--primary);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
}

h2.section-title {
  font-size: 1.15rem;
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}
.section-title-row h2.section-title { margin: 0; }

table.vocab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}
table.vocab-table th, table.vocab-table td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--hairline);
}
table.vocab-table th { color: var(--ink-mute); font-size: 0.8rem; text-transform: uppercase; }
table.vocab-table .pron { color: var(--ink-mute); font-size: 0.85rem; }

.speak-btn {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  font-size: 0.9rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 8px;
  flex-shrink: 0;
  transition: background 0.15s ease, transform 0.1s ease;
}
.speak-btn:hover { background: var(--hairline-cool); }
.speak-btn:active { transform: scale(0.92); }
.speak-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-play-all { font-size: 0.85rem; padding: 8px 14px; }

.speech-warning {
  color: var(--ink-mute);
  font-size: 0.85rem;
  margin-top: 10px;
}

.grammar-explain { font-size: 0.96rem; }
.grammar-explain b { color: var(--ink); }

ul.examples-list {
  margin: 0;
  padding-left: 0;
}
ul.examples-list li {
  margin-bottom: 8px;
  background: var(--canvas-soft);
  list-style: none;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px dashed var(--hairline);
  display: flex;
  align-items: center;
}

ul.examples-list li.dialogue-item {
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.dialogue-turn {
  display: flex;
  align-items: center;
}

.speaker-tag {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  margin-right: 8px;
  flex-shrink: 0;
}
.speaker-tag.speaker-a { background: var(--primary); color: var(--on-primary); }
.speaker-tag.speaker-b { background: var(--accent-violet); }

.quiz-question { margin-bottom: 20px; }
.quiz-question p.q-text { font-weight: 600; margin-bottom: 8px; }
.quiz-context {
  font-style: italic;
  color: var(--ink-mute);
  background: var(--canvas-soft);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  margin-bottom: 8px;
}

.quiz-audio {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.speak-btn-wide {
  width: auto;
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  font-size: 0.85rem;
}

.quiz-transcript {
  display: none;
  width: 100%;
  background: var(--canvas-soft);
  border: 1px dashed var(--hairline);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  font-size: 0.88rem;
  color: var(--ink-mute);
  margin: 6px 0 0;
}
.quiz-transcript.show { display: block; }

.passage-box {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  font-size: 0.94rem;
  line-height: 1.7;
  white-space: pre-line;
}
.passage-box p { margin: 0 0 10px; }
.passage-box p:last-child { margin-bottom: 0; }

.quiz-choices { display: flex; flex-direction: column; gap: 6px; }
.quiz-choices label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.92rem;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.quiz-choices label:hover { background: var(--canvas-soft); }
.quiz-choices label.correct { background: rgba(62,207,142,0.1); border-color: var(--primary); }
.quiz-choices label.incorrect { background: rgba(255,34,1,0.08); border-color: var(--danger); }
.quiz-choices input { accent-color: var(--primary); }

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

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  border: none;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
}
.btn-primary:hover { background: var(--primary-deep); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: var(--canvas);
  border: 1px solid var(--hairline-strong);
  color: var(--ink);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
}
.btn-secondary:hover { background: var(--canvas-soft); }

.quiz-result {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  display: none;
}
.quiz-result.show { display: block; }
.quiz-result.pass { background: rgba(62,207,142,0.12); color: var(--primary-deep); }
.quiz-result.fail { background: rgba(255,34,1,0.08); color: var(--danger); }

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
}

footer.site-footer {
  text-align: center;
  color: var(--ink-mute);
  font-size: 0.82rem;
  padding: 24px;
}

/* ===== Roadmap page ===== */
.date-input {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 9px 12px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  margin: 8px 0;
}

.roadmap-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 14px;
}

.roadmap-row {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
}

.roadmap-row.current {
  border-color: var(--primary);
  background: rgba(62,207,142,0.06);
}

.roadmap-stage-name {
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.roadmap-desc {
  color: var(--ink-mute);
  font-size: 0.88rem;
  margin: 4px 0 8px;
}

.roadmap-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--ink-mute);
  margin-bottom: 6px;
}

/* ===== Vocabulary bank & flashcards ===== */
.vocab-stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.vocab-stats-compact {
  gap: 8px;
  margin-bottom: 10px;
}
.vocab-stats-compact .vocab-stat-box {
  min-width: 0;
  padding: 8px;
}
.vocab-stats-compact .vocab-stat-box strong { font-size: 1.15rem; }
.vocab-stats-compact .vocab-stat-box span { font-size: 0.7rem; }

.vocab-stat-box {
  flex: 1;
  min-width: 120px;
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 14px;
  text-align: center;
}
.vocab-stat-box strong { display: block; font-size: 1.6rem; color: var(--ink); }
.vocab-stat-box span { font-size: 0.8rem; color: var(--ink-mute); }

.vocab-progress {
  text-align: center;
  color: var(--ink-mute);
  font-size: 0.85rem;
  margin-bottom: 14px;
}

.flashcard {
  max-width: 480px;
  margin: 0 auto;
  min-height: 260px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  cursor: pointer;
  position: relative;
  background: var(--canvas);
  box-shadow: 0 4px 14px rgba(0,0,0,0.05);
}

.flashcard-face {
  padding: 32px 24px;
  text-align: center;
  min-height: 260px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.flashcard-back { display: none; }
.flashcard.flipped .flashcard-front { display: none; }
.flashcard.flipped .flashcard-back { display: flex; }

.flashcard-word {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--ink);
  margin-top: 10px;
}

.flashcard-pos {
  color: var(--ink-mute);
  font-size: 0.85rem;
  font-style: italic;
}

.flashcard-hint {
  color: var(--ink-mute);
  font-size: 0.82rem;
  margin-top: 18px;
}

.flashcard-th {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-deep);
}

.flashcard-example {
  color: var(--ink-mute);
  font-size: 0.92rem;
  margin-top: 10px;
  max-width: 380px;
}

.speak-btn-lg {
  width: 44px;
  height: 44px;
  font-size: 1.3rem;
  border-radius: 50%;
}

.flashcard-actions {
  max-width: 480px;
  margin: 16px auto 0;
  display: flex;
  gap: 12px;
  justify-content: center;
}

.flashcard-actions button {
  flex: 1;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: none;
  font-weight: 700;
  font-size: 0.95rem;
}

.btn-forgot { background: rgba(255,34,1,0.08); color: var(--danger); }
.btn-forgot:hover { background: rgba(255,34,1,0.14); }
.btn-remembered { background: rgba(62,207,142,0.12); color: var(--primary-deep); }
.btn-remembered:hover { background: rgba(62,207,142,0.2); }

/* ===== Mock Exam ===== */
.mock-timer-bar {
  position: sticky;
  top: 66px;
  z-index: 15;
  background: var(--canvas-night);
  color: var(--on-dark);
  border: none;
  text-align: center;
}
.mock-timer-bar .module-tag { color: rgba(255,255,255,0.85); }
.mock-timer-bar h1 { margin: 4px 0; font-size: 2.4rem; font-variant-numeric: tabular-nums; }
.mock-timer-bar .th-title { color: rgba(255,255,255,0.9); margin: 0; }

@media (max-width: 860px) {
  .mock-timer-bar { top: 62px; }
}

.score-trend-chart {
  margin-bottom: 18px;
}

.score-trend-svg {
  width: 100%;
  height: auto;
  display: block;
}

.score-trend-legend {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--ink-mute);
}

.score-trend-legend span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.score-trend-legend i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

/* ===== Mini-games: Sentence Scramble ===== */
.scramble-answer-zone {
  min-height: 64px;
  border: 2px dashed var(--hairline);
  border-radius: var(--radius-lg);
  padding: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 16px;
  background: var(--canvas-soft);
}

.scramble-bank-zone {
  min-height: 56px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 6px 0;
}

.scramble-placeholder {
  color: var(--ink-mute);
  font-size: 0.9rem;
}

.scramble-tile {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 9px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}
.scramble-tile:hover { background: var(--canvas-soft); }
.scramble-tile:active { transform: scale(0.95); }
.scramble-tile.placed {
  background: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}
.scramble-tile.placed:hover { background: var(--primary-deep); }

.scramble-feedback {
  min-height: 24px;
  font-weight: 700;
  margin: 12px 0;
}
.scramble-feedback.show.pass { color: var(--primary-deep); }
.scramble-feedback.show.fail { color: var(--danger); }

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

/* ===== Mini-games: Speed Word Match ===== */
.speed-match-clue {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  margin: 8px 0 22px;
}

.speed-match-choices {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  max-width: 560px;
  margin: 0 auto;
}

.speed-match-choice {
  padding: 16px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
}
.speed-match-choice.correct { background: rgba(62,207,142,0.12); border-color: var(--primary); color: var(--primary-deep); }
.speed-match-choice.incorrect { background: rgba(255,34,1,0.08); border-color: var(--danger); color: var(--danger); }
.speed-match-choice:disabled { cursor: default; }

@media (max-width: 560px) {
  .speed-match-choices { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  #menuToggle { display: inline-block; }
  nav.sidebar {
    position: fixed;
    top: 62px;
    left: 0;
    bottom: 0;
    background: var(--canvas);
    z-index: 30;
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    box-shadow: 4px 0 12px rgba(0,0,0,0.08);
  }
  nav.sidebar.open { transform: translateX(0); }
  main.content { padding: 18px 14px 50px; }
  .overall-progress { min-width: 120px; }
  header.site-header .brand span.full-title { display: none; }
}