:root{--ink:#201b35;--muted:#766f87;--purple:#7449d4;--line:#e3ddec;--bg:#f8f5fc;--good:#168764;--bad:#ca4545}*{box-sizing:border-box}body{margin:0;min-width:320px;background:radial-gradient(circle at 50% -10%,#e8ddff,transparent 38%),var(--bg);color:var(--ink);font:16px/1.55 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(225,218,237,.9);background:rgba(252,250,255,.91);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,#7449d4,#aa7ee9);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:#5c536f;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-number{display:grid;width:92px;height:92px;place-items:center;margin:auto;border-radius:28px;background:linear-gradient(145deg,#7449d4,#bb86ef);color:#fff;font-size:38px;font-weight:900;box-shadow:0 18px 42px rgba(116,73,212,.25);transform:rotate(-4deg)}.eyebrow{margin:20px 0 4px;color:var(--purple);font-size:11px;font-weight:850;letter-spacing:.14em}.ready h1,.result h1{margin:5px 0;font-size:clamp(40px,7vw,68px);letter-spacing:-.055em}.lead{max-width:620px;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:128px;padding:20px;border:2px solid transparent;border-radius:20px;background:#fff;box-shadow:0 8px 26px rgba(50,35,82,.06);cursor:pointer}.mode-card.active{border-color:var(--purple);background:#f1ebff}.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:#eee6ff;color:var(--purple);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%);margin-top:10px}.leaderboard{display:grid;grid-template-columns:220px 1fr;align-items:center;gap:22px;margin:30px 0;padding:20px 24px;border:1px solid #e2d8ef;border-radius:20px;background:linear-gradient(135deg,#f4edff,#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,.8)}.leaderboard strong{color:var(--purple)}.leaderboard .empty-rank{justify-content:center;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:#eee7fb;color:var(--purple);font-size:12px;font-weight:800}.timer.urgent{color:var(--bad)}.progress{height:5px;margin-top:8px;overflow:hidden;border-radius:9px;background:#e6e0eb}.progress i{display:block;height:100%;background:linear-gradient(90deg,#7449d4,#c18bea);transition:width 1s linear}.target{margin:30px 0 12px;color:var(--muted);text-align:center}.target strong{color:var(--purple);font-size:28px}.number-cards{display:flex;justify-content:center;gap:14px;margin:18px 0}.number-card{display:grid;width:82px;height:94px;place-items:center;border:2px solid #d9cbea;border-radius:20px;background:#fff;color:var(--purple);font-size:36px;font-weight:900;box-shadow:0 8px 20px rgba(67,43,105,.08);cursor:pointer}.number-card.used{opacity:.25;transform:scale(.92);pointer-events:none}.expression{display:flex;min-height:88px;align-items:center;justify-content:center;gap:8px;margin:18px 0;padding:14px;border:3px solid #9b72e1;border-radius:21px;background:#fff;font-size:clamp(25px,5vw,40px);font-weight:800}.expression.empty{color:#b2a9bf;font-size:16px;font-weight:500}.token-number{color:var(--purple)}.builder{display:grid;grid-template-columns:1fr auto;gap:12px;width:min(680px,100%);margin:auto}.operators{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.operators button,.edit-actions button{min-height:54px;border:1px solid var(--line);border-radius:14px;background:#fff;font-size:23px;font-weight:800;cursor:pointer}.edit-actions{display:grid;grid-template-columns:repeat(2,72px);gap:8px}.edit-actions button{font-size:13px}.feedback{min-height:28px;margin:18px 0;color:var(--muted);text-align:center;font-weight:700}.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}.play-actions{display:flex;justify-content:center;gap:10px}.hint-box{margin:18px auto;padding:14px 18px;border-radius:14px;background:#fff5d9;color:#7d5a12;text-align:center}.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 #c7a5ef;border-radius:18px;background:#f4ecff;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 #cdbce1;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:#938b9f;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}.builder{grid-template-columns:1fr}.edit-actions{grid-template-columns:repeat(2,1fr)}.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}.number-cards{gap:8px}.number-card{width:65px;height:76px;font-size:30px}.operators{grid-template-columns:repeat(3,1fr)}.scorebar strong{font-size:42px}.scorebar>span{max-width:115px;text-align:center}.result-grid{grid-template-columns:1fr}.result-actions{flex-direction:column}.result-actions button{width:100%}}