/* SRT/VTT Subtitle Editor — mobile-first, system fonts, no external assets */
:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --ink: #1f2937;
  --muted: #5d6673; /* a11y (A9b): #6b7280 measured 4.499:1 on #f4f7fb (prior audit measured it on white, 4.83); #5d6673 is ~5.4:1 */
  --accent: #7c3aed;
  --accent-dark: #5b21b6;
  --gold: #f59e0b;
  --danger: #b91c1c; /* a11y (A9): #dc2626 was 4.41:1 on #fef2f2; #b91c1c is ~5.9:1 */
  --ok: #047857;
  --line: #e5e7eb;
  --radius: 12px;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
.proto-ribbon {
  background: var(--gold); color: #3b0f8c; text-align: center;
  font-weight: 700; font-size: 13px; padding: 6px 10px;
}
.page-head { max-width: 860px; margin: 0 auto; padding: 28px 16px 8px; text-align: center; }
.page-head h1 { margin: 0 0 8px; font-size: 28px; color: var(--accent-dark); }
.tagline { margin: 0; color: var(--muted); }
main { max-width: 860px; margin: 0 auto; padding: 12px 16px 48px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin: 16px 0; box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.card h2 { margin-top: 0; font-size: 20px; }

/* visually hidden but keyboard-focusable (a11y A5: file input must be reachable) */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* dropzone */
.dropzone {
  display: block; border: 2px dashed var(--accent); border-radius: var(--radius);
  padding: 28px 16px; text-align: center; cursor: pointer; background: #faf7ff;
}
.dropzone:focus-within { outline: 3px solid var(--accent-dark); outline-offset: 2px; }
.dropzone.drag { background: #f0e8ff; border-color: var(--accent-dark); }
.dz-icon { font-size: 32px; display: block; }
.dz-text { display: block; font-weight: 600; margin: 6px 0; }
.dz-sub { display: block; color: var(--muted); font-size: 13px; }

/* notices + errors */
.notice { border-radius: 8px; padding: 10px 14px; margin: 12px 0; font-size: 14px; }
.notice.ok { background: #ecfdf5; color: var(--ok); border: 1px solid #a7f3d0; }
.notice.error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.error-panel { background: #fffbeb; border: 1px solid var(--gold); border-radius: 8px; padding: 12px 16px; margin: 12px 0; }
.error-panel h2 { font-size: 16px; margin: 0 0 6px; }
.error-panel ul { margin: 0; padding-left: 20px; font-size: 14px; }
.error-panel li { margin: 4px 0; }

/* toolbar */
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }
.tool-group {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
}
.tool-group label { font-size: 14px; display: flex; align-items: center; gap: 6px; }
input[type="text"], input[type="number"], textarea {
  font: inherit; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
  min-height: 44px; background: #fff; color: var(--ink); width: 100%;
}
.tool-group input[type="text"], .tool-group input[type="number"] { width: auto; max-width: 150px; }
button {
  font: inherit; min-height: 44px; padding: 8px 16px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--accent); background: #fff; color: var(--accent-dark); font-weight: 600;
}
button:hover { background: #f5f0ff; }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.primary:hover { background: var(--accent-dark); }
button.danger { border-color: var(--danger); color: var(--danger); }
button:disabled { opacity: .45; cursor: not-allowed; }
.ci { font-size: 13px; white-space: nowrap; }

/* cue list */
.list-head { display: flex; justify-content: space-between; align-items: baseline; margin: 18px 0 4px; }
.list-head h2 { margin: 0; font-size: 18px; }
#cue-count { color: var(--muted); font-size: 14px; }
.overlap-note { background: #fffbeb; border: 1px solid var(--gold); border-radius: 8px; padding: 8px 12px; font-size: 14px; }
.cue { border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin: 10px 0; background: #fff; }
.cue-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.cue-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.cue-actions button { min-height: 40px; padding: 6px 10px; font-size: 13px; }
.cue-times { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.cue-times label { flex: 1 1 140px; font-size: 13px; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }
.cue textarea { resize: vertical; }
.cue-err { color: var(--danger); font-size: 13px; margin-top: 6px; }
.ovl { background: #fef3c7; color: #92400e; border-radius: 6px; padding: 2px 8px; font-size: 12px; font-weight: 700; }
.empty { color: var(--muted); text-align: center; padding: 24px 0; }
.export-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

/* content sections */
.steps, .features, .limits { padding-left: 20px; }
.steps li, .features li, .limits li { margin: 6px 0; }
.faq h3 { font-size: 16px; margin: 14px 0 4px; }
.faq p { margin: 0 0 6px; color: var(--muted); }
.meta ul { list-style: none; padding: 0; margin: 0; }
.meta li { margin: 4px 0; }
code { background: #f3f4f6; padding: 1px 6px; border-radius: 4px; font-size: 13px; }

@media (max-width: 640px) {
  .page-head h1 { font-size: 23px; }
  .card { padding: 16px; }
  .tool-group { width: 100%; }
  .export-row button { flex: 1 1 100%; }
}