:root{--ink:#17332e;--muted:#6d807c;--green:#128c7f;--line:#d9e9e5;--bg:#f3faf8;--bad:#c94949}*{box-sizing:border-box}body{margin:0;min-width:320px;background:radial-gradient(circle at 50% -10%,#d9f4ec,transparent 40%),var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}button,a,input{font:inherit;touch-action:manipulation}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:12px max(18px,calc((100% - 1040px)/2));border-bottom:1px solid rgba(214,232,227,.9);background:rgba(248,253,252,.92);backdrop-filter:blur(15px)}.brand{display:flex;align-items:center;gap:11px;color:inherit;text-decoration:none}.brand>span{display:grid;width:42px;height:42px;place-items:center;border-radius:13px;background:linear-gradient(145deg,#128c7f,#57bea7);color:#fff;font-weight:850}.brand strong,.brand small{display:block}.brand small{color:var(--muted);font-size:11px}.back{padding:9px 13px;border:1px solid var(--line);border-radius:11px;background:#fff;color:#48645f;text-decoration:none;font-size:13px;font-weight:750}main{width:min(920px,calc(100% - 32px));min-height:calc(100vh - 150px);margin:auto;padding:54px 0 90px}.ready,.result{text-align:center}.hero-icon{display:grid;width:92px;height:92px;place-items:center;margin:auto;border-radius:28px;background:linear-gradient(145deg,#128c7f,#67c9b1);color:#fff;font-size:42px;font-weight:900;box-shadow:0 18px 42px rgba(18,140,127,.22)}.eyebrow{margin:19px 0 4px;color:var(--green);font-size:11px;font-weight:850;letter-spacing:.14em}.ready h1,.result h1{margin:5px 0;font-size:clamp(40px,7vw,66px);letter-spacing:-.055em}.lead{max-width:650px;margin:10px auto 34px;color:var(--muted)}.mode-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px;margin:25px 0;text-align:left}.mode-card{min-height:126px;padding:20px;border:2px solid transparent;border-radius:20px;background:#fff;box-shadow:0 8px 26px rgba(30,78,68,.06);cursor:pointer}.mode-card.active{border-color:var(--green);background:#e8f7f3}.mode-card span{display:flex;justify-content:space-between;gap:10px}.mode-card b{font-size:18px}.mode-card em{height:max-content;padding:3px 9px;border-radius:999px;background:#def3ed;color:var(--green);font-size:10px;font-style:normal}.mode-card small{display:block;margin-top:10px;color:var(--muted)}.primary,.secondary{min-height:48px;padding:11px 22px;border-radius:13px;font-weight:800;cursor:pointer}.primary{border:0;background:var(--ink);color:#fff}.secondary{border:1px solid var(--line);background:#fff;color:var(--ink)}.start{width:min(420px,100%)}.leaderboard{display:grid;grid-template-columns:220px 1fr;align-items:center;gap:22px;margin:30px 0;padding:20px 24px;border:1px solid var(--line);border-radius:20px;background:linear-gradient(135deg,#e8f8f3,#fff);text-align:left}.leaderboard .eyebrow{margin:0}.leaderboard h2{margin:3px 0 0;font-size:18px}.leaderboard ol{display:grid;gap:6px;margin:0;padding:0;list-style:none}.leaderboard li{display:flex;justify-content:space-between;gap:12px;padding:8px 12px;border-radius:10px;background:rgba(255,255,255,.85)}.leaderboard strong{color:var(--green)}.empty-rank{justify-content:center!important;color:var(--muted);font-size:13px}.scorebar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.scorebar>div:last-child{text-align:right}.scorebar small,.scorebar strong{display:block}.scorebar small{color:var(--muted)}.scorebar strong{font-size:50px;font-weight:400;font-variant-numeric:tabular-nums}.scorebar>span{padding:8px 14px;border-radius:999px;background:#dff3ee;color:var(--green);font-size:12px;font-weight:800}.timer.urgent{color:var(--bad)}.progress{height:5px;margin-top:8px;overflow:hidden;border-radius:9px;background:#dfeae7}.progress i{display:block;height:100%;background:linear-gradient(90deg,#128c7f,#68c8b0);transition:width 1s linear}.category{margin:28px 0 8px;color:var(--green);font-size:12px;font-weight:850;letter-spacing:.1em;text-align:center}.question{display:grid;min-height:175px;place-items:center;padding:24px;border:1px solid var(--line);border-radius:26px;background:#fff;text-align:center;box-shadow:0 12px 34px rgba(28,78,68,.07)}.question h2{max-width:720px;margin:0;font-size:clamp(25px,5vw,42px);line-height:1.4}.answer-row{display:flex;justify-content:center;gap:10px;margin:24px 0}.answer-row input{width:min(300px,65%);height:62px;padding:10px 16px;border:3px solid #58ad9f;border-radius:17px;background:#fff;font-size:28px;font-weight:800;text-align:center}.answer-row span{display:grid;min-width:80px;place-items:center;padding:0 16px;border-radius:15px;background:#dff3ee;color:var(--green);font-size:18px;font-weight:850}.feedback{min-height:28px;margin:12px 0;color:var(--muted);text-align:center;font-weight:750}.feedback.good{color:var(--green)}.feedback.bad{color:var(--bad)}.explanation{margin:16px 0;padding:18px 22px;border:1px solid #ecd794;border-radius:17px;background:#fff8dd;color:#6d5310;text-align:left}.explanation b{display:block;margin-bottom:5px}.explanation p{margin:0;white-space:pre-line}.play-actions{display:flex;justify-content:center;gap:10px}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0}.result-grid article{padding:22px;border:1px solid var(--line);border-radius:18px;background:#fff}.result-grid small,.result-grid strong{display:block}.result-grid small{color:var(--muted)}.result-grid strong{margin-top:6px;font-size:27px}.rank-form{display:grid;grid-template-columns:1fr minmax(170px,220px) auto;align-items:center;gap:12px;margin:24px 0;padding:20px;border:2px solid #91cfc2;border-radius:18px;background:#e9f8f4;text-align:left}.rank-form b,.rank-form small{display:block}.rank-form small{color:var(--muted)}.rank-form input{min-height:48px;padding:10px 13px;border:1px solid #acd4cc;border-radius:12px}.rank-form p{grid-column:1/-1;margin:0;color:var(--bad);font-size:12px}.result-actions{display:flex;justify-content:center;gap:10px;margin-top:24px}footer{padding:24px;color:#849792;text-align:center;font-size:11px}@media(max-width:700px){main{width:calc(100% - 24px);padding-top:34px}.leaderboard{grid-template-columns:1fr;gap:12px}.rank-form{grid-template-columns:1fr}.rank-form p{grid-column:auto}}@media(max-width:500px){.brand small{display:none}.mode-grid{grid-template-columns:1fr}.scorebar strong{font-size:42px}.scorebar>span{max-width:110px;text-align:center}.question{min-height:150px;padding:18px}.answer-row input{width:65%}.result-grid{grid-template-columns:1fr}.result-actions{flex-direction:column}.result-actions button{width:100%}}