:root {
  --accent: #2f6fb0;
  --accent-dark: #245789;
  --accent-soft: #e6eef7;
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #22262b;
  --muted: #5f6873;
  --border: #d9dde2;
  --ok: #1f7a3d;
  --err: #b3261e;
  --err-soft: #fdecea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --accent: #7fb0e6;
    --accent-dark: #a3c7ef;
    --accent-soft: #1d2a38;
    --bg: #15171a;
    --card: #1f2226;
    --text: #e6e8eb;
    --muted: #a3aab3;
    --border: #3a3f46;
    --ok: #6fcf8e;
    --err: #f28b82;
    --err-soft: #3a1f1d;
  }
}
[hidden] { display: none !important; }
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.6;
}
.container { max-width: 760px; margin: 0 auto; padding: 16px; }
.site-header { margin-bottom: 12px; }
.site-title { margin: 0; font-size: 0.9rem; color: var(--muted); }
h1 { font-size: 1.45rem; line-height: 1.3; margin: 0 0 12px; }
h2 { font-size: 1.1rem; margin: 20px 0 6px; }
[lang="en"] { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.card.narrow { max-width: 560px; margin: 0 auto; }
.center { text-align: center; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.button {
  display: inline-block; border: 0; border-radius: 8px; padding: 12px 18px;
  font-size: 1rem; font-weight: 600; cursor: pointer; text-decoration: none;
  background: var(--accent); color: #fff; min-height: 44px;
}
@media (prefers-color-scheme: dark) { .button { color: #10151b; } }
.button:hover { background: var(--accent-dark); }
.button:disabled { opacity: 0.5; cursor: default; }
.button-secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.button-secondary:hover { background: var(--accent-soft); }
.link { background: none; border: 0; color: var(--muted); text-decoration: underline; cursor: pointer; font-size: 0.9rem; padding: 8px 0; }
.error { color: var(--err); font-weight: 600; }
.notice { background: var(--err-soft); border-radius: 8px; padding: 10px 12px; }
.hint { font-size: 0.9rem; color: var(--muted); }
.field { margin: 18px 0; border: 0; padding: 0; }
.field > label, .field > legend { display: block; font-weight: 600; margin-bottom: 8px; }
input[type="number"] {
  width: 100%; max-width: 200px; padding: 10px; font-size: 1rem;
  border: 1px solid var(--border); border-radius: 8px; background: var(--card); color: var(--text);
}
.check { display: flex; gap: 10px; align-items: flex-start; padding: 6px 0; cursor: pointer; }
.check input { margin-top: 5px; width: 18px; height: 18px; flex: none; }
.consent-form { margin-top: 24px; border-top: 1px solid var(--border); padding-top: 16px; }
.progress-label { color: var(--muted); font-size: 0.9rem; margin: 0 0 12px; }

/* trial */
.caption { background: var(--accent-soft); border-radius: 8px; padding: 12px 14px; margin-bottom: 16px; }
.caption-label { margin: 0; font-size: 0.8rem; color: var(--muted); }
.caption-text { margin: 4px 0 0; color: var(--text); font-size: 1.05rem; }
.players { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 600px) { .players { grid-template-columns: 1fr; } }
.player { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; }
.player-name { margin: 0 0 6px; font-size: 1.3rem; font-weight: 700; }
.player audio { width: 100%; }
.player-status { margin: 6px 0 0; font-size: 0.85rem; color: var(--muted); }
.player-status.ok { color: var(--ok); font-weight: 600; }
.lock-note { margin: 16px 0 0; font-size: 0.9rem; color: var(--muted); }
#questions { border: 0; padding: 0; margin: 8px 0 0; min-width: 0; }
#questions:disabled { opacity: 0.45; }
.question { margin-top: 18px; padding: 8px; border-radius: 8px; }
.question.missing { background: var(--err-soft); }
.question-label { margin: 0 0 8px; font-weight: 600; }
.question-label [lang="en"] { font-weight: 400; font-size: 0.9rem; }
.choice-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.choice {
  display: flex; align-items: center; justify-content: center; text-align: center;
  min-height: 52px; padding: 6px; border: 1px solid var(--border); border-radius: 8px;
  cursor: pointer; background: var(--card); color: var(--text); font-size: 1rem; line-height: 1.25;
}
.choice input { position: absolute; opacity: 0; pointer-events: none; }
.choice:has(input:checked), .choice.selected { border-color: var(--accent); background: var(--accent-soft); font-weight: 700; box-shadow: inset 0 0 0 1px var(--accent); }
.choice:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
button.choice:disabled { opacity: 0.45; cursor: default; }
#hc-choices { margin-top: 16px; }
.quit { text-align: right; margin: 8px 0 0; }

/* admin */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; font-size: 0.85rem; width: 100%; }
th, td { border-bottom: 1px solid var(--border); padding: 4px 6px; text-align: left; white-space: nowrap; }
.mono { font-family: ui-monospace, monospace; font-size: 0.85rem; word-break: break-word; }