[hidden] { display: none !important; }
:root {
  --bg: #fff8ec;
  --card: #ffffff;
  --ink: #2b2d42;
  --muted: #8d99ae;
  --primary: #ff9f1c;
  --primary-dark: #e07c00;
  --ok: #2ec27e;
  --bad: #ef476f;
  --line: #f0e3cc;
  --radius: 18px;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body { margin: 0; background: var(--bg); color: var(--ink); }
button { font: inherit; cursor: pointer; }
button:disabled { cursor: default; }

.btn {
  border: 0; border-radius: 999px; padding: 12px 26px; font-size: 17px; font-weight: 600;
  background: #fff; color: var(--ink); box-shadow: 0 3px 0 var(--line), 0 0 0 2px var(--line) inset;
  transition: transform .1s;
}
.btn.primary { background: var(--primary); color: #fff; box-shadow: 0 4px 0 var(--primary-dark); }
.btn:active:not(:disabled) { transform: translateY(2px); }
.btn:disabled { opacity: .45; }
.link { background: none; border: 0; color: var(--muted); font-size: 15px; }

/* 焦点高亮：电视遥控器和键盘用户需要清晰的焦点 */
[data-nav]:focus { outline: 4px solid #ffd60a; outline-offset: 3px; }
[data-nav]:focus:not(:focus-visible) { outline: none; }
.tv [data-nav]:focus, body.tv-mode [data-nav]:focus { outline: 5px solid #ffd60a; outline-offset: 4px; transform: scale(1.04); }

.toast { position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%); background: rgba(0,0,0,.8); color: #fff; padding: 12px 22px; border-radius: 999px; z-index: 1000; font-size: 16px; }

/* ---------- 答题卡片 ---------- */
.quiz-loading { text-align: center; padding: 60px 0; color: var(--muted); font-size: 18px; }
.quiz-card { background: var(--card); border-radius: var(--radius); padding: 22px; box-shadow: 0 8px 30px rgba(0,0,0,.06); max-width: 720px; margin: 0 auto; }
.quiz-top { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.quiz-count { font-weight: 700; }
.dots { display: flex; gap: 6px; flex: 1; }
.dot { width: 12px; height: 12px; border-radius: 50%; background: var(--line); }
.dot.cur { background: var(--primary); }
.dot.ok { background: var(--ok); }
.dot.bad { background: var(--bad); }
.quiz-intro { background: #fff3d6; border-radius: 12px; padding: 8px 12px; margin-bottom: 12px; font-size: 14px; color: #8a5a00; }
.tags { display: flex; gap: 8px; margin-bottom: 10px; }
.tag { color: #fff; border-radius: 999px; padding: 3px 12px; font-size: 13px; }
.tag.type { background: #8d99ae; }
.quiz-q { font-size: 22px; font-weight: 700; line-height: 1.6; margin: 6px 0 18px; }
.speak { border: 0; background: #f3f0ff; border-radius: 50%; width: 36px; height: 36px; font-size: 17px; vertical-align: middle; }
.options { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .options:not(.judge) { grid-template-columns: 1fr; } }
.opt {
  display: flex; align-items: center; gap: 12px; text-align: left; padding: 14px 16px; min-height: 58px;
  border: 2px solid var(--line); border-radius: 14px; background: #fff; font-size: 18px; color: var(--ink);
}
.opt b { flex: none; width: 32px; height: 32px; border-radius: 50%; background: #fff3d6; display: flex; align-items: center; justify-content: center; font-size: 15px; }
.opt.picked { border-color: var(--primary); background: #fff7e6; }
.opt.picked b { background: var(--primary); color: #fff; }
.judge .opt { justify-content: center; font-size: 22px; font-weight: 700; }
.judge .yes { color: var(--ok); } .judge .no { color: var(--bad); }
.opt.right, .fill input.right { border-color: var(--ok); background: #e6f9ef; }
.opt.wrong, .fill input.wrong { border-color: var(--bad); background: #ffe8ee; }
.submit { margin-top: 14px; width: 100%; }
.hint { color: var(--muted); font-size: 13px; text-align: center; margin: 6px 0 0; }
.fill { display: flex; gap: 10px; }
.fill input { flex: 1; min-width: 0; font-size: 20px; padding: 12px 16px; border: 2px solid var(--line); border-radius: 14px; }
.quiz-feedback:not(:empty) { margin-top: 18px; display: grid; gap: 14px; }
.fb { border-radius: 14px; padding: 14px 16px; line-height: 1.7; }
.fb.ok { background: #e6f9ef; } .fb.bad { background: #ffe8ee; }
.fb-title { font-size: 20px; font-weight: 800; }
.fb-explain { color: #555; }
.fb-countdown { margin-top: 14px; font-size: 22px; font-weight: 700; color: #2a9d63; }
.fb-countdown b { font-size: 1.6em; margin: 0 4px; }
.quiz-error { color: var(--bad); }
.result { text-align: center; }
.result .big { font-size: 72px; }
.result h2 { margin: 6px 0; font-size: 28px; }
.result .stars { font-size: 34px; letter-spacing: 6px; }
.result .penalty { background: #fff3d6; border-radius: 12px; padding: 10px; color: #8a5a00; }
.result .actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 16px; }

/* 电视：10 英尺界面，加大字号 */
.quiz-card.tv { max-width: 1100px; padding: 36px 44px; }
.quiz-card.tv .quiz-q { font-size: 36px; }
.quiz-card.tv .opt { font-size: 30px; min-height: 90px; }
.quiz-card.tv .opt b { width: 46px; height: 46px; font-size: 22px; }
.quiz-card.tv .btn { font-size: 26px; padding: 16px 40px; }
.quiz-card.tv .fb { font-size: 24px; }
.quiz-card.tv .fb-countdown { font-size: 30px; }
.quiz-card.tv .fill input { font-size: 30px; }