/* Thai Phrases — mobile-first, light, friendly travel vibe */
:root {
  --ink: #1c2430;
  --ink-soft: #4a5568;
  --bg: #fdfcfa;
  --card: #ffffff;
  --line: #e7e2d9;
  --accent: #e4572e;        /* warm Thai-orange */
  --accent-dark: #c7431f;
  --accent-darker: #a83518;
  --teal: #0e7c7b;
  --gold: #f2a007;
  --good: #1d8a4e;
  --bad: #c0392b;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(28, 36, 48, 0.07);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans Thai", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  font-size: 17px;
}

/* ---------- sticky header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(253, 252, 250, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.55rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.main-nav { display: flex; gap: 0.25rem; flex-wrap: wrap; }
.main-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.55rem 0.7rem;
  border-radius: 999px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.main-nav a:hover, .main-nav a:focus { background: #f3ede2; color: var(--ink); }

/* ---------- language switcher (EN | 中文) ---------- */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  margin-left: 0.4rem;
  padding-left: 0.55rem;
  border-left: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
}
.lang-switch a { padding: 0.55rem 0.35rem; }
.lang-switch a.is-current { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- layout ---------- */
main { max-width: 960px; margin: 0 auto; padding: 0 1rem 3rem; }
.section { padding-top: 2.2rem; scroll-margin-top: 84px; }
.section h2 { font-size: 1.55rem; margin: 0 0 0.6rem; }
.section-intro { color: var(--ink-soft); margin-top: 0; max-width: 65ch; }
.subsection-title { margin-top: 2rem; font-size: 1.2rem; }

/* ---------- hero ---------- */
.hero {
  text-align: center;
  padding: 2.6rem 0.5rem 1rem;
}
.hero h1 {
  font-size: clamp(1.7rem, 5.2vw, 2.6rem);
  line-height: 1.2;
  margin: 0 0 0.8rem;
}
.hero-sub {
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 auto 1.4rem;
  font-size: 1.05rem;
}
.hero-img { display: block; width: min(300px, 72vw); height: auto; border-radius: 16px; margin: 0 auto 1.2rem; }
.hero-actions { display: flex; gap: 0.6rem; justify-content: center; flex-wrap: wrap; }
.progress-line { margin-top: 1.2rem; font-weight: 600; color: var(--teal); }

/* ---------- honesty strip ---------- */
.honesty-strip {
  text-align: center;
  font-weight: 700;
  color: var(--teal);
  background: #f7f3ea;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  margin: 0.6rem auto 0;
  max-width: 720px;
  font-size: 0.98rem;
}

/* ---------- buttons & chips ---------- */
.btn {
  appearance: none;
  border: 2px solid transparent;
  border-radius: 999px;
  padding: 0.65rem 1.25rem;
  min-height: 48px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  background: #f3ede2;
  color: var(--ink);
}
.btn-primary { background: var(--accent-dark); color: #fff; }
.btn-primary:hover, .btn-primary:focus { background: var(--accent-darker); }
.btn-secondary { background: #fff; border-color: var(--line); }
.btn-secondary:hover, .btn-secondary:focus { border-color: var(--ink-soft); }
.btn-small { padding: 0.4rem 0.85rem; min-height: 44px; font-size: 0.92rem; }
.btn-big { font-size: 1.1rem; padding: 0.8rem 1.6rem; }

.chip {
  border: 2px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  min-height: 44px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--ink-soft);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.chip:hover, .chip:focus { border-color: var(--accent); color: var(--ink); }
.chip.is-active { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }

/* ---------- phrasebook ---------- */
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.section-head h2 { margin: 0; }
.speech-controls { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; }
.speech-controls-label { color: var(--ink-soft); font-size: 0.95rem; font-weight: 600; }
.voice-note {
  background: #fff6e0;
  border: 1px solid #ecd28a;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
}
.audio-note {
  background: #fbf7ee;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
  max-width: 65ch;
}
.scenario-chips { display: flex; gap: 0.45rem; flex-wrap: wrap; margin: 0.8rem 0 0.4rem; }

.scenario { margin-top: 1.8rem; scroll-margin-top: 84px; }
.scenario h3 {
  font-size: 1.25rem;
  margin: 0 0 0.7rem;
  padding-bottom: 0.4rem;
  border-bottom: 3px solid #f3ede2;
}
.phrase-list { display: grid; gap: 0.6rem; }
@media (min-width: 720px) {
  .phrase-list { grid-template-columns: 1fr 1fr; }
}
.phrase-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.phrase-card.is-learned { border-color: var(--gold); background: #fffdf4; }
.phrase-thai { font-size: 1.45rem; font-weight: 700; line-height: 1.3; }
.phrase-roman { color: var(--accent-dark); font-weight: 600; }
.phrase-en { font-size: 1.02rem; }
.phrase-note { color: var(--ink-soft); font-size: 0.9rem; }
.phrase-actions { display: flex; gap: 0.45rem; margin-top: 0.55rem; }
.icon-btn {
  flex: 0 0 auto;
  min-width: 52px;
  min-height: 48px;
  border-radius: 12px;
  border: 2px solid var(--line);
  background: #fff;
  font-size: 1.15rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  padding: 0.35rem 0.7rem;
  font-weight: 600;
  color: var(--ink);
}
.icon-btn:hover, .icon-btn:focus { border-color: var(--accent); }
.icon-btn.star[aria-pressed="true"] { background: #fff3cf; border-color: var(--gold); }

/* ---------- guide ---------- */
.guide-text { max-width: 68ch; }
.guide-text p { margin: 0 0 1rem; }

/* ---------- tones ---------- */
.tone-grid {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .tone-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .tone-grid { grid-template-columns: repeat(3, 1fr); } }
.tone-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 5px solid var(--teal);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.9rem 1rem;
}
.tone-card h3 { margin: 0 0 0.25rem; font-size: 1.1rem; }
.tone-mark { color: var(--accent-dark); font-weight: 700; }
.tone-card p { margin: 0.3rem 0; color: var(--ink-soft); font-size: 0.95rem; }
.tone-example { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.5rem; }
.tone-example .th { font-size: 1.3rem; font-weight: 700; color: var(--ink); }
.tone-example .rm { color: var(--accent-dark); font-weight: 600; }

.minimal-set { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.minimal-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.6rem 0.8rem;
  text-align: center;
  min-width: 108px;
  flex: 1 1 108px;
}
.minimal-item .th { display: block; font-size: 1.5rem; font-weight: 700; }
.minimal-item .rm { display: block; color: var(--accent-dark); font-weight: 700; }
.minimal-item .en { display: block; color: var(--ink-soft); font-size: 0.88rem; }
.minimal-item .tn { display: block; font-size: 0.82rem; font-weight: 700; color: var(--teal); text-transform: capitalize; }
.minimal-item button { margin-top: 0.45rem; width: 100%; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.1rem 1.2rem;
  margin-top: 1.4rem;
}
.card h3 { margin-top: 0; }

/* ---------- drill ---------- */
.drill-stage { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin: 0.8rem 0; }
.drill-word { display: flex; flex-direction: column; }
.drill-thai { font-size: 2rem; font-weight: 800; line-height: 1.15; }
.drill-en { color: var(--ink-soft); }
.drill-options, .quiz-options { display: grid; gap: 0.5rem; grid-template-columns: 1fr; margin-top: 0.6rem; }
@media (min-width: 640px) {
  .drill-options { grid-template-columns: repeat(5, 1fr); }
  .quiz-options { grid-template-columns: 1fr 1fr; }
}
.option-btn {
  min-height: 52px;
  border-radius: 12px;
  border: 2px solid var(--line);
  background: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.6rem 0.8rem;
  color: var(--ink);
  text-align: center;
}
.option-btn:hover:not(:disabled), .option-btn:focus:not(:disabled) { border-color: var(--accent); }
.option-btn:disabled { cursor: default; opacity: 0.85; }
.option-btn.is-correct { border-color: var(--good); background: #e7f6ec; }
.option-btn.is-wrong { border-color: var(--bad); background: #fdecea; }
.feedback { min-height: 1.5em; font-weight: 700; margin: 0.7rem 0 0; }
.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }
.score-line { color: var(--ink-soft); display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; }

/* ---------- quiz ---------- */
.quiz-card { margin-top: 1rem; }
.quiz-top {
  display: flex; justify-content: space-between; gap: 1rem;
  color: var(--ink-soft); font-weight: 600; font-size: 0.95rem;
}
.quiz-question { text-align: center; padding: 1rem 0 0.4rem; display: flex; flex-direction: column; align-items: center; gap: 0.4rem; }
.quiz-thai { font-size: 2.2rem; font-weight: 800; }
.quiz-roman { color: var(--accent-dark); font-weight: 600; min-height: 1.4em; }
.quiz-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 0.8rem; }
.quiz-best { color: var(--teal); font-weight: 600; }

/* The `hidden` attribute must always win over component display rules
   (e.g. .btn is display:inline-flex, which otherwise overrides it). */
[hidden] { display: none !important; }

/* ---------- review (spaced repetition) + streak ---------- */
.streak-line { margin-top: 0.35rem; font-weight: 700; color: var(--accent-dark); min-height: 1.4em; }
.review-card { margin-top: 1rem; }
.review-status { font-weight: 600; margin-top: 0; }
.review-cue { color: var(--ink-soft); font-weight: 600; font-size: 0.95rem; }
.review-say-cue { font-size: 1.25rem; font-weight: 700; max-width: 55ch; }
.review-answer { text-align: center; padding: 0.6rem 0 0.2rem; display: flex; flex-direction: column; align-items: center; gap: 0.3rem; }
.review-answer-thai { font-size: 2rem; font-weight: 800; line-height: 1.2; }
.grade-row { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 0.9rem; }
.grade-btn { flex: 1 1 120px; background: #fff; border: 2px solid var(--line); color: var(--ink); }
.grade-btn:hover, .grade-btn:focus { border-color: var(--accent); }
.grade-again:hover, .grade-again:focus { border-color: var(--bad); }
.grade-good:hover, .grade-good:focus { border-color: var(--good); }
.grade-easy:hover, .grade-easy:focus { border-color: var(--teal); }

/* ---------- quick-answer table ---------- */
.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.quick-table { width: 100%; border-collapse: collapse; min-width: 540px; }
.quick-table th, .quick-table td {
  text-align: left;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
.quick-table thead th { background: #f7f3ea; color: var(--ink-soft); font-size: 0.92rem; }
.quick-table tbody tr:last-child td { border-bottom: none; }
.quick-table .qt-en { font-weight: 600; }
.quick-table .qt-th { font-size: 1.22rem; font-weight: 700; }
.quick-table .qt-roman { color: var(--accent-dark); font-weight: 600; }
.quick-table .qt-listen { text-align: right; width: 1%; white-space: nowrap; }
.quick-table .qt-listen .icon-btn { min-width: 48px; min-height: 44px; font-size: 1.05rem; }

/* ---------- faq ---------- */
.faq-item { border-top: 1px solid var(--line); padding: 1rem 0.2rem; }
.faq-item:first-of-type { border-top: none; padding-top: 0.2rem; }
.faq-item h3 { margin: 0 0 0.35rem; font-size: 1.12rem; }
.faq-item p { margin: 0; color: var(--ink-soft); max-width: 68ch; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: #f7f3ea;
  margin-top: 3rem;
}
.footer-inner { max-width: 960px; margin: 0 auto; padding: 2rem 1rem 2.4rem; }
.footer-tagline { font-size: 1.15rem; font-weight: 700; margin: 0 0 1.2rem; }
.waitlist-form label { font-weight: 600; display: block; margin-bottom: 0.5rem; }
.waitlist-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.waitlist-row input {
  flex: 1 1 240px;
  min-height: 48px;
  border: 2px solid var(--line);
  border-radius: 999px;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  background: #fff;
  color: var(--ink);
}
.waitlist-note { color: var(--ink-soft); font-size: 0.88rem; max-width: 60ch; }
.footer-small { color: var(--ink-soft); font-size: 0.88rem; margin-top: 1.4rem; }

/* ---------- accessibility: keyboard focus + reduced motion (P0) ---------- */
:focus-visible {
  outline: 3px solid var(--accent-dark);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}