@import url('https://fonts.googleapis.com/css2?family=Inter+Tight:wght@400;500;600;700;800&family=Noto+Sans+TC:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&family=Fraunces:opsz,wght@9..144,400;9..144,600;9..144,700&display=swap');

:root {
  --font-en: 'Inter Tight', system-ui, sans-serif;
  --font-zh: 'Noto Sans TC', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --font-serif: 'Fraunces', Georgia, serif;
}

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

html, body, #root {
  height: 100%;
  width: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-zh), var(--font-en);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Theme: Editorial light ─────────────────────────────────── */
.t-edit {
  --bg:           #f7f4ee;
  --surface:      #ffffff;
  --surface-2:    #efeae0;
  --ink:          #14110d;
  --ink-2:        #5a544a;
  --ink-3:        #918a7c;
  --line:         #e1dccf;
  --primary:      var(--vl-primary,   #2f5d3a);
  --primary-ink:  var(--vl-primary-ink, #ffffff);
  --primary-soft: var(--vl-primary-soft, #dfe8d9);
  --correct:      #2f5d3a;
  --correct-soft: #dfe8d9;
  --wrong:        #8a2a2a;
  --wrong-soft:   #efd9d4;
  --shadow-card:  0 1px 0 rgba(20,17,13,.06), 0 6px 18px rgba(20,17,13,.05);
  --radius-card:  4px;
  --radius-btn:   4px;
}

/* ── Theme: Editorial dark ──────────────────────────────────── */
.t-edit-dark {
  --bg:           #14110d;
  --surface:      #1c1814;
  --surface-2:    #25211b;
  --ink:          #f5f0e6;
  --ink-2:        #a99f8e;
  --ink-3:        #6e6557;
  --line:         #2e2920;
  --primary:      var(--vl-primary,   #8fc09b);
  --primary-ink:  var(--vl-primary-ink, #14110d);
  --primary-soft: var(--vl-primary-soft, #25342a);
  --correct:      #8fc09b;
  --correct-soft: #25342a;
  --wrong:        #d68a8a;
  --wrong-soft:   #36261f;
  --shadow-card:  0 1px 0 rgba(0,0,0,.4), 0 6px 18px rgba(0,0,0,.4);
  --radius-card:  4px;
  --radius-btn:   4px;
}

/* ── App shell ──────────────────────────────────────────────── */
.app-shell {
  background: var(--bg);
  color: var(--ink);
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  /* safe area: iOS notch + home indicator */
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  font-family: var(--font-zh), var(--font-en);
}

/* centre-column for large screens */
@media (min-width: 480px) {
  #root {
    display: flex;
    justify-content: center;
    align-items: stretch;
    background: #0e0c09;
  }
  .app-shell {
    width: 393px;
    box-shadow: 0 0 80px rgba(0,0,0,.6);
  }
}

/* ── Scrollable inner area ──────────────────────────────────── */
.page-scroll {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.page-scroll::-webkit-scrollbar { display: none; }

/* ── Buttons ────────────────────────────────────────────────── */
button { font-family: inherit; cursor: pointer; }

.btn-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  border: none;
  font-weight: 600;
  font-size: 15px;
  transition: transform .12s ease, opacity .15s;
  font-family: var(--font-zh), var(--font-en);
  white-space: nowrap;
}
.btn-pill:active { transform: scale(0.97); }
.btn-pill.primary { background: var(--primary); color: var(--primary-ink); }
.btn-pill.ghost   { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-pill.disabled { background: var(--surface-2); color: var(--ink-3); cursor: not-allowed; }

.chrome-btn {
  width: 38px; height: 38px;
  border-radius: var(--radius-btn);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  display: grid; place-items: center;
  cursor: pointer;
  flex-shrink: 0;
}
.chrome-btn:active { opacity: .7; }

/* ── Dot progress indicators ────────────────────────────────── */
.dot {
  width: 6px; height: 6px;
  border-radius: 999px;
  background: var(--ink-3);
  opacity: .35;
  border: none;
  padding: 0;
  transition: all .25s;
  cursor: default;
}
.dot.active { background: var(--primary); opacity: 1; width: 22px; }

/* ── Category tag ───────────────────────────────────────────── */
.cat-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 999px;
  letter-spacing: .02em;
  background: var(--primary-soft);
  color: var(--primary);
}

/* ── Image placeholder (while loading) ──────────────────────── */
.img-box {
  background:
    repeating-linear-gradient(135deg, rgba(0,0,0,.04) 0 1px, transparent 1px 12px),
    var(--surface-2);
  position: relative;
  overflow: hidden;
}
.t-edit-dark .img-box {
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,.04) 0 1px, transparent 1px 12px),
    var(--surface-2);
}
.img-box img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}

/* ── Audio progress bar ─────────────────────────────────────── */
.progress-track {
  flex: 1; height: 3px;
  background: var(--surface-2);
  position: relative;
  border-radius: 999px;
  cursor: pointer;
}
.progress-fill {
  position: absolute;
  top: 0; left: 0; height: 100%;
  background: var(--primary);
  border-radius: 999px;
  pointer-events: none;
}
.progress-thumb {
  position: absolute;
  top: 50%; width: 14px; height: 14px;
  border-radius: 999px;
  background: var(--primary);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

/* ── Answer option ───────────────────────────────────────────── */
.option-row {
  display: flex; align-items: center; gap: 12px;
  padding: 14px;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  background: var(--surface);
  transition: background .15s, border-color .15s;
  text-align: left;
  font: inherit;
  color: inherit;
  width: 100%;
  cursor: pointer;
}
.option-row:disabled { cursor: default; }
.option-label {
  width: 28px; height: 28px;
  border-radius: 2px;
  background: var(--surface-2);
  color: var(--ink-2);
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 700;
  flex-shrink: 0;
}

/* ── Bottom dock ─────────────────────────────────────────────── */
.bottom-dock {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 12px 16px 28px;
  background: linear-gradient(180deg, transparent 0%, var(--bg) 35%);
  pointer-events: none;
}
.dock-inner {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 10px 12px;
  pointer-events: auto;
}

/* ── Spinner animation ───────────────────────────────────────── */
@keyframes vl-spin { to { transform: rotate(360deg); } }
.spinner {
  border-radius: 999px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  animation: vl-spin .8s linear infinite;
  flex-shrink: 0;
}

/* ── Sheet slide-up ──────────────────────────────────────────── */
@keyframes vl-slideup {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

/* ── Overlay backdrop ────────────────────────────────────────── */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(20,17,13,.5);
  z-index: 30;
  display: flex;
  align-items: flex-end;
}
.sheet {
  background: var(--surface);
  width: 100%;
  padding: 24px 24px 36px;
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
  animation: vl-slideup .25s ease;
}