/* Palette and type follow the project page (assets/index.html). */
:root {
  --ink: #101016;
  --paper: #f8f6ef;
  --mist: #dfeaf0;
  --ember: #ff7a3d;
  --blue: #183a57;
  --muted: #6e7682;
  --card: #ffffff;
  --rule: #e4e0d4;
  --serif: "Fraunces", "Cormorant Garamond", Georgia, serif;
  --sans: "Space Grotesk", "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 15px/1.6 var(--sans); }
[hidden] { display: none !important; }

.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 24px; background: var(--ink); color: var(--paper);
}
.brand { font: 700 18px var(--serif); letter-spacing: .01em; }
.topbar-right { display: flex; gap: 16px; align-items: center; }
.progress { font: 600 13px var(--mono); color: #ffd27a; }
.lang-switch { display: flex; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; overflow: hidden; }
.lang-switch button { background: none; border: 0; color: var(--paper); padding: 4px 12px; font: 600 13px var(--sans); cursor: pointer; }
.lang-switch button.on { background: var(--ember); color: var(--ink); }

main { max-width: min(1900px, 96vw); margin: 0 auto; padding: 24px 0; }
h1 { font: 700 30px/1.2 var(--serif); margin: 0 0 12px; }
h2 { font: 700 22px var(--serif); margin: 0 0 4px; }
h3 { font: 700 15px var(--sans); margin: 0 0 6px; color: var(--blue); }
.eyebrow { font: 600 12px var(--mono); text-transform: uppercase; letter-spacing: .12em; color: var(--ember); margin: 0 0 4px; }

.panel { background: var(--card); border: 1px solid var(--rule); border-radius: 14px; padding: 20px 24px; margin-bottom: 20px; }
#view-welcome, #view-done { max-width: 820px; margin: 24px auto; }
.prose p { margin: 0 0 10px; }
.prose ul, .prose ol { margin: 0 0 10px; padding-left: 22px; }
.prose li { margin-bottom: 4px; }
.prose code { font: 13px var(--mono); background: var(--mist); padding: 0 4px; border-radius: 4px; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 16px 0; }
.form-grid label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; }
.form-grid input, .form-grid select { font: 15px var(--sans); padding: 8px 10px; border: 1px solid var(--rule); border-radius: 8px; background: #fff; }
.consent { display: flex; gap: 8px; align-items: flex-start; margin: 8px 0 16px; }

button.primary { background: var(--ember); color: var(--ink); border: 0; border-radius: 999px; padding: 10px 24px; font: 700 15px var(--sans); cursor: pointer; }
button.primary:disabled { background: #e2ddd1; color: var(--muted); cursor: not-allowed; }
button.ghost { background: none; border: 1px solid var(--rule); border-radius: 999px; padding: 10px 20px; font: 600 14px var(--sans); color: var(--muted); cursor: pointer; }

.task-head { margin-bottom: 12px; }
.brief summary { cursor: pointer; font: 700 16px var(--sans); margin-bottom: 8px; }
.brief-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 28px; margin-top: 12px; font-size: 14px; }

.mute-note { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
.candidates { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-bottom: 20px; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 14px; padding: 12px; display: flex; flex-direction: column; gap: 10px; }
.card-head { display: flex; justify-content: space-between; align-items: center; }
.badge { font: 700 18px var(--serif); }
.play { font: 600 13px var(--sans); color: var(--blue); text-decoration: none; border: 1px solid var(--blue); border-radius: 999px; padding: 4px 12px; }
.play:hover { background: var(--blue); color: var(--paper); }
.card video { width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: 8px; }
.demo-rail { display: flex; flex-wrap: wrap; gap: 6px; }
.demo-rail button { border: 1px solid var(--rule); background: var(--paper); border-radius: 6px; padding: 2px 8px; font: 12px var(--mono); cursor: pointer; }
.demo-rail button.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.questions .hint { color: var(--muted); margin: 0 0 12px; }
.qrow { display: grid; grid-template-columns: 1fr auto; align-items: start; gap: 24px; padding: 14px 0; border-top: 1px solid var(--rule); }
.qlabel { display: flex; flex-direction: column; }
.qlabel > span { color: var(--muted); font-size: 13px; }
.qexpect { font-size: 13.5px; margin-top: 6px; }
.qexpect-head { margin: 4px 0 2px; font-weight: 600; }
.qexpect ul { margin: 2px 0 6px; padding-left: 20px; }
.qexpect li { margin-bottom: 2px; }
.qrule p { margin: 0 0 6px; color: var(--muted); font-style: italic; }
.qopts { position: sticky; top: 60px; display: flex; flex-direction: column; gap: 8px; }
.qline { display: flex; gap: 10px; align-items: center; }
.qtag { width: 104px; font: 600 12px var(--mono); color: var(--muted); text-align: right; }

.sheet { margin-top: 12px; border-top: 1px solid var(--rule); padding-top: 12px; }
.sheet > summary { cursor: pointer; font: 700 16px var(--sans); }
.sheet-table { width: 100%; border-collapse: collapse; margin: 12px 0 18px; font-size: 13px; }
.sheet-table caption { text-align: left; font: 700 15px var(--serif); padding: 4px 0; }
.sheet-table th, .sheet-table td { border: 1px solid var(--rule); padding: 6px 8px; vertical-align: top; }
.sheet-table th { background: var(--paper); text-align: left; }
.sheet-item { width: 52%; }
.sheet-item p { margin: 0; }
.sheet-orig p { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.sheet-en { font-size: 11.5px; color: var(--muted); margin-top: 4px; }
.sheet-en summary { cursor: pointer; color: var(--blue); }
.sheet-en p { margin: 2px 0 0; }
.sheet-table select { width: 100%; font: 13px var(--sans); padding: 3px; border: 1px solid var(--rule); border-radius: 6px; }
.sheet-table select.rated { background: #fff3ea; border-color: var(--ember); }
.qopts { display: flex; gap: 10px; }
.opt { position: relative; }
.opt input { position: absolute; opacity: 0; }
.opt span { display: inline-block; min-width: 56px; text-align: center; padding: 8px 14px; border: 1.5px solid var(--rule); border-radius: 10px; font: 700 16px var(--serif); cursor: pointer; }
.opt input:checked + span { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.opt input:focus-visible + span { outline: 2px solid var(--ember); }
.actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 16px; }
#btn-prev { margin-right: auto; }
button.ghost:disabled { opacity: .4; cursor: not-allowed; }
.revisit { margin: 0 0 12px; padding: 8px 12px; background: #fff3ea; border-left: 3px solid var(--ember); border-radius: 6px; }
.error { color: #c0392b; margin: 8px 0 0; }

@media (max-width: 1000px) {
  .candidates { grid-template-columns: 1fr; }
  .brief-grid, .form-grid { grid-template-columns: 1fr; }
}