:root{--bg:#faf9f6;--card:#fff;--fg:#1c1917;--muted:#78716c;--line:#e7e5e4;--primary:#0f766e;--primary-soft:#ccfbf1;--correct:#059669;--correct-bg:#ecfdf5;--correct-border:#a7f3d0;--radius:14px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;line-height:1.75;font-size:16px;padding-bottom:74px}
a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}
.topbar{position:sticky;top:0;z-index:20;background:rgba(250,249,246,.93);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar .in{max-width:860px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:12px}
.logo{font-weight:800;font-size:17px;letter-spacing:.3px;color:var(--fg)}.logo span{color:var(--primary)}
.topnav{margin-left:auto;display:flex;gap:16px;font-size:14px}.topnav a{color:var(--muted)}.topnav a.on{color:var(--primary);font-weight:700}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}main{padding:20px 0 40px}
h1{font-size:26px;line-height:1.32;margin:6px 0 10px;letter-spacing:-.3px}h2{font-size:19px;margin:26px 0 12px}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:8px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:13px;color:var(--muted)}
.chip.cat{color:var(--primary);border-color:var(--primary-soft);background:var(--primary-soft);font-weight:600}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:0 0 16px}
.answer-key{border:1px solid var(--primary-soft);background:linear-gradient(180deg,#f0fdfa,#fff);border-radius:var(--radius);padding:14px 16px;margin:0 0 14px}
.ak-head{display:flex;align-items:baseline;gap:10px;font-weight:800;margin-bottom:10px;font-size:16px}.ak-head span{font-weight:400;font-size:13px;color:var(--muted)}
.ak-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(62px,1fr));gap:6px}
.ak-item{display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:6px 8px;font-size:14px}
.ak-item b{color:var(--muted);font-size:12px;min-width:16px}.ak-item span{font-weight:800;color:var(--primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toolbar{display:flex;gap:10px;margin:0 0 16px;flex-wrap:wrap}
.toggle{background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 16px;font-size:14px;cursor:pointer;color:var(--fg)}
.q{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:0 0 14px}
.q-head{display:flex;gap:10px;margin-bottom:12px}
.q-num{flex:0 0 28px;height:28px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800}
.q-text{font-weight:700;font-size:16.5px;line-height:1.68}
.opts{list-style:none;margin:0;padding:0}
.opt{display:flex;gap:10px;align-items:flex-start;padding:11px 12px;border:1px solid transparent;border-radius:10px;margin:6px 0;font-size:15.5px;line-height:1.62}
.opt.correct{background:var(--correct-bg);border-color:var(--correct-border)}
.olabel{flex:0 0 24px;height:24px;border-radius:6px;background:#f5f5f4;color:#57534e;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800}
.opt.correct .olabel{background:var(--correct);color:#fff}
.otext{flex:1}.badge{flex:none;background:var(--correct);color:#fff;font-size:11px;border-radius:999px;padding:2px 8px;white-space:nowrap;align-self:center}
.noans{color:#b45309;font-size:13px;margin:8px 0 0}
.searchbox{display:flex;gap:8px;margin:14px 0}
.searchbox input{flex:1;padding:13px 14px;border:1px solid var(--line);border-radius:12px;font-size:16px;background:#fff;min-width:0}
.btn{padding:13px 20px;border:0;border-radius:12px;background:var(--primary);color:#fff;font-size:15px;font-weight:700;cursor:pointer}
.hero{background:linear-gradient(135deg,#0f766e,#134e4a);color:#fff;border-radius:18px;padding:26px 20px;margin:8px 0 16px}
.hero h1{color:#fff;margin:0 0 6px;font-size:27px}.hero p{margin:0 0 16px;opacity:.92;font-size:14px}
.hero .searchbox input{border:0}
.stats{display:flex;gap:10px;margin:0 0 16px}
.stat{flex:1;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px;text-align:center}
.stat b{display:block;font-size:22px;color:var(--primary);line-height:1.3}.stat span{font-size:12px;color:var(--muted)}
.list{list-style:none;padding:0;margin:0}
.list li{display:flex;gap:10px;align-items:baseline;padding:11px 0;border-bottom:1px solid var(--line)}
.list li:last-child{border-bottom:0}.list .t{flex:1}.list .date{color:var(--muted);font-size:12px;white-space:nowrap}.list .cnt{color:var(--muted);font-size:12px;white-space:nowrap}
.cats{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 18px}
.cats a{background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:14px;color:var(--fg)}.cats a b{color:var(--primary)}
.ad{margin:20px 0;min-height:90px;text-align:center}
footer.site{border-top:1px solid var(--line);padding:24px 0 100px;color:var(--muted);font-size:13px}
.bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:30;display:flex;background:rgba(255,255,255,.97);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:6px 0 8px}
.bottom-nav a{flex:1;text-align:center;font-size:11px;color:var(--muted);display:flex;flex-direction:column;gap:2px;align-items:center}
.bottom-nav a .ic{font-size:19px;line-height:1}.bottom-nav a.on{color:var(--primary);font-weight:800}
@media(min-width:700px){.bottom-nav{display:none}body{padding-bottom:0}footer.site{padding-bottom:24px}}
body.quiz-mode .opt.correct{background:#fff;border-color:transparent}
body.quiz-mode .opt.correct .badge{display:none}
body.quiz-mode .opt.correct .olabel{background:#f5f5f4;color:#57534e}
body.quiz-mode .answer-key{filter:blur(7px);pointer-events:none}
@media(max-width:600px){h1{font-size:21px}.hero h1{font-size:23px}.q-text{font-size:15.5px}.opt{font-size:15px;padding:12px 10px}.topnav{display:none}}