:root{--ink:#1d1d1f;--muted:#6e6e73;--accent:#0071e3;--accent-d:#0062c4;--pale:#f5f5f7;--line:#e5e5ea;--paper:#fff;--ground:#fbfbfd;--ok:#1d7a46;--okbg:#eef8f1;--bad:#b3261e;--badbg:#fdf1f0;--r:18px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px;-webkit-text-size-adjust:100%}
html,body{overflow-x:clip}
body{margin:0;background:var(--ground);color:var(--ink);font:400 1.0625rem/1.65 -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue","Segoe UI",system-ui,Arial,sans-serif;-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh}
main{flex:1;width:100%;min-width:0}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:.18em}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid rgba(0,113,227,.45);outline-offset:3px;border-radius:8px}

.site-header{background:rgba(251,251,253,.8);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.08);position:sticky;top:0;z-index:100}
.site-header-inner{max-width:1040px;margin:auto;padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between;height:52px;gap:1rem}
.brand-mark-svg{width:24px;height:24px;flex-shrink:0;border-radius:6px}
.site-header a.brand-name,.site-header a.brand-name:hover{display:inline-flex;align-items:center;gap:.6rem;color:var(--ink);font-weight:600;font-size:1rem;letter-spacing:-.01em;text-decoration:none}
.site-header nav{display:flex;gap:1.6rem}
.site-header nav a{color:var(--muted);font-size:.9rem;white-space:nowrap}
.site-header nav a:hover,.site-header nav a[aria-current=page]{color:var(--ink);text-decoration:none}

.site-header nav.langs{gap:.9rem;margin-left:auto;padding-left:1.4rem}
.site-header nav.langs a{font-size:.82rem;color:var(--muted)}
.site-header nav.langs a[aria-current]{color:var(--ink);font-weight:600}
:lang(zh) body,body:lang(zh){font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif}
:lang(zh) h1,:lang(zh) h2,:lang(zh) .score{letter-spacing:0}
.page-shell{max-width:760px;margin:0 auto;padding:3.5rem 1.5rem 5rem}
.breadcrumb{font-size:.9rem;color:var(--muted);margin-bottom:1rem;display:flex;gap:.5rem;align-items:center}
.breadcrumb a{color:inherit}
h1{font-size:clamp(2rem,6vw,3.25rem);font-weight:600;line-height:1.08;letter-spacing:-.03em;margin:.2rem 0 1rem}
h2{font-size:clamp(1.4rem,3.2vw,1.85rem);font-weight:600;line-height:1.2;letter-spacing:-.02em;margin:3.2rem 0 .8rem}
h2.first{margin-top:0}
h3{font-size:1.15rem;font-weight:600;margin:1.8rem 0 .4rem}
p{margin:.8rem 0}
.lead{font-size:clamp(1.15rem,2.4vw,1.4rem);line-height:1.5;color:var(--muted);max-width:34em;letter-spacing:-.01em}
ol,ul{padding-left:1.3rem}
li{margin:.4rem 0}

.hero{text-align:center;padding:1.5rem 0 1rem}
.hero .lead{margin-left:auto;margin-right:auto}
.card{background:var(--paper);border-radius:var(--r);padding:1.6rem 1.7rem;margin:1.5rem 0;box-shadow:0 1px 2px rgba(0,0,0,.04),0 8px 30px rgba(0,0,0,.05)}
.notice{background:var(--pale);color:var(--muted);padding:1rem 1.2rem;border-radius:14px;margin:1.6rem 0;font-size:.95rem;line-height:1.55}
.notice strong{color:var(--ink);font-weight:600}
.facts{background:var(--pale);border-radius:var(--r);padding:1.3rem 1.6rem}
.facts ul{margin:.3rem 0 0}
.tablewrap{overflow-x:auto;border-radius:14px;box-shadow:0 0 0 1px var(--line)}
table{border-collapse:collapse;width:100%;background:var(--paper);font-size:.97rem}
th,td{border-bottom:1px solid var(--line);padding:.8rem 1rem;text-align:left;vertical-align:top}
tr:last-child td{border-bottom:0}
th{background:var(--pale);font-weight:600;font-size:.9rem;color:var(--muted)}
td.num,th.num{text-align:right;white-space:nowrap}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}
.cards label.choice{display:block;cursor:pointer;background:var(--paper);border:0;border-radius:14px;padding:1.2rem 1.3rem;box-shadow:0 0 0 1px var(--line);transition:box-shadow .2s}
.cards label.choice:hover{box-shadow:0 0 0 1px #c7c7cc}
.cards label.choice:has(input:checked){box-shadow:0 0 0 2px var(--accent)}
.cards label.choice strong{font-weight:600;font-size:1.05rem}
.cards label.choice{display:grid;grid-template-columns:auto 1fr;column-gap:.7rem;align-content:start}
.cards label.choice>*{grid-column:2}
.cards label.choice input{grid-column:1;grid-row:1/4;align-self:start;accent-color:var(--accent);margin:.3rem 0 0}
.cards .meta{display:block;color:var(--muted);font-size:.92rem;margin-top:.3rem;line-height:1.5}

.btn{display:inline-block;background:var(--accent);color:#fff;border:0;border-radius:980px;padding:.8rem 1.7rem;font:500 1.0625rem/1.2 inherit;cursor:pointer;transition:background .2s,transform .1s}
.btn:hover{background:var(--accent-d);color:#fff;text-decoration:none}
.btn:active{transform:scale(.98)}
.btn.secondary{background:transparent;color:var(--accent);box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn.secondary:hover{background:rgba(0,113,227,.07);color:var(--accent)}
.row{display:flex;flex-wrap:wrap;gap:.9rem 1.2rem;align-items:center;margin-top:1.4rem}
.row label{color:var(--muted);font-size:.97rem}
.row input[type=checkbox]{accent-color:var(--accent);width:1.05rem;height:1.05rem;vertical-align:-.15rem;margin-right:.4rem}

.timerbar{position:sticky;top:60px;z-index:50;background:rgba(251,251,253,.85);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);color:var(--muted);padding:.6rem 1.2rem;border-radius:980px;display:flex;justify-content:space-between;align-items:center;gap:1rem;font-size:.92rem;font-variant-numeric:tabular-nums;box-shadow:0 0 0 1px var(--line),0 6px 20px rgba(0,0,0,.06)}
.timerbar .time{font-size:1.35rem;font-weight:600;color:var(--ink);letter-spacing:-.01em}
.timerbar .time.low{color:var(--bad)}
.q{background:var(--paper);border-radius:var(--r);padding:1.5rem 1.7rem;margin:1.2rem 0;box-shadow:0 1px 2px rgba(0,0,0,.04),0 8px 30px rgba(0,0,0,.05)}
.q fieldset{border:0;margin:0;padding:0;min-width:0}
.q legend{font-weight:500;padding:0;margin-bottom:.9rem;line-height:1.55}
.q .qno{display:block;color:var(--muted);font-size:.82rem;font-weight:500;letter-spacing:.04em;text-transform:uppercase;margin-bottom:.3rem}
.opt{display:flex;gap:.7rem;align-items:flex-start;padding:.7rem .9rem;margin:.25rem 0;border-radius:12px;cursor:pointer;transition:background .15s}
.opt:hover{background:var(--pale)}
.opt:has(input:checked){background:rgba(0,113,227,.08)}
.opt input{margin-top:.38rem;flex-shrink:0;accent-color:var(--accent)}
.opt .let{font-weight:600;min-width:1.5rem;color:var(--muted)}
.q.done .opt{cursor:default}
.q.done .opt:hover{background:transparent}
.q.done .opt.correct,.q.done .opt.correct:hover{background:var(--okbg)}
.q.done .opt.wrong,.q.done .opt.wrong:hover{background:var(--badbg)}
.tag{font-weight:600;font-size:.88rem;margin-left:auto;white-space:nowrap}
.opt.correct .tag{color:var(--ok)}
.opt.wrong .tag{color:var(--bad)}
.expl{margin-top:1rem;padding:1rem 1.2rem;background:var(--pale);border-radius:12px;font-size:.97rem;line-height:1.6}
.score{font-size:clamp(2rem,6vw,3rem);font-weight:600;letter-spacing:-.03em;margin:0 0 .4rem;line-height:1.1}
#result{text-align:center;padding:2.4rem 1.7rem}
#result .row{justify-content:center}
#scoreNote{color:var(--muted);max-width:34em;margin:.6rem auto 0;font-size:.95rem}

details{border-bottom:1px solid var(--line);padding:1rem 0;margin:0}
details:first-of-type{border-top:1px solid var(--line)}
summary{cursor:pointer;font-weight:500;list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:1.5rem;font-weight:300;color:var(--muted);line-height:1;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);margin:.7rem 0 0}
.hidden{display:none!important}

.legal-container{max-width:760px;margin:0 auto}
article h2{border:0}
article>p:last-child{margin-top:2.8rem;padding-top:1.4rem;border-top:1px solid var(--line);color:var(--muted);font-size:.92rem}
.legal-highlight{background:var(--pale);border-radius:14px;padding:1rem 1.25rem}
.error-card{text-align:center;padding:4rem 1rem}
.error-card p{color:var(--muted);margin-bottom:2rem}

.site-footer{background:var(--pale);color:var(--muted);padding:2rem 1.5rem;text-align:center;font-size:.85rem}
.footer-nav{list-style:none;margin:0 0 .8rem;padding:0;display:flex;gap:.4rem 1.6rem;justify-content:center;flex-wrap:wrap}
.footer-nav li{margin:0}
.footer-nav a{color:var(--muted)}
.footer-nav a:hover{color:var(--ink)}
.footer-meta{margin:0}
.footer-meta strong{font-weight:600;color:var(--ink)}
@media (max-width:560px){th,td{padding:.6rem .5rem;font-size:.9rem;overflow-wrap:anywhere}.site-header-inner{height:auto;flex-wrap:wrap;padding-top:.45rem;padding-bottom:.45rem;row-gap:.2rem}.site-header nav.langs{padding-left:0}.page-shell{padding:2.2rem 1.1rem 3.5rem}.site-header-inner{padding:0 1.1rem}.site-header nav{gap:.9rem}.site-header nav a{font-size:.82rem}.site-header a.brand-name,.site-header a.brand-name:hover{font-size:.92rem}.card,.q{padding:1.2rem 1.1rem}.timerbar{top:56px}.tag{margin-left:.4rem}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.site-header,.site-footer,.timerbar,.row{display:none}}