*{box-sizing:border-box} :root{color-scheme:light;--ink:#202b28;--muted:#718079;--line:#dfe6e2;--paper:#fff;--bg:#f5f7f5;--green:#276b58;--green-dark:#1e5547;--mint:#e5f1eb;--red:#a64537;--red-bg:#fae9e5;--gold:#a47830;--gold-bg:#f7efdd;--blue:#456982;--blue-bg:#e7eff4;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif} body{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.55}button,select{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;padding-bottom:80px}.topbar{height:76px;padding:0 max(22px,calc((100% - 1120px)/2));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:#fbfcfb}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:inherit}.brand-mark{height:38px;width:38px;display:grid;place-items:center;background:var(--green);color:white;border-radius:9px;font-weight:750;font-size:19px}.brand strong,.brand 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12px;max-width:600px}.intro-copy{margin:0;color:#53645d}.intro-figure{width:190px;height:150px;position:relative;display:grid;place-items:center;color:#fff;font-size:27px;font-weight:700}.intro-figure:before{content:"";position:absolute;width:126px;height:126px;border-radius:50%;background:#b7d0c0}.intro-figure span,.intro-figure b,.intro-figure i{position:absolute;z-index:1}.intro-figure span{left:42px;top:36px;background:#b8694b;border-radius:44% 56% 52% 48%;padding:13px 16px}.intro-figure b{right:20px;bottom:31px;background:#a37535;border-radius:52% 48% 45% 55%;padding:8px 14px}.intro-figure i{height:8px;width:80px;background:#6c8b72;transform:rotate(-22deg);border-radius:99px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);background:white;border:1px solid var(--line);margin:18px 0 32px}.metrics>div{padding:17px 20px;border-right:1px solid var(--line)}.metrics>div:last-child{border-right:0}.metrics strong,.metrics span{display:block}.metrics strong{font-size:23px}.metrics span{font-size:12px;color:var(--muted)}.study-section{margin:0 0 34px}.section-title{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px}.section-title h2{font-size:19px;margin:0}.section-title>span{font-size:12px;color:var(--muted)}.start-row{display:flex;gap:10px;align-items:center;padding:16px;background:#fff;border:1px solid var(--line)}.button{border:1px solid transparent;border-radius:6px;padding:10px 16px;min-height:42px;font-weight:650;transition:background .15s,border .15s}.button.primary{background:var(--green);color:#fff}.button.primary:hover{background:var(--green-dark)}.button.secondary{background:#fff;border-color:var(--line);color:var(--ink)}.button.secondary:hover{background:#f1f5f2}.button.small{min-height:36px;padding:6px 11px;font-size:13px}.select-wrap select{height:42px;border:1px solid var(--line);background:#fff;border-radius:6px;padding:0 34px 0 12px;color:var(--ink);max-width:100%}.knowledge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.knowledge-card{min-height:122px;text-align:left;border:1px solid var(--line);background:#fff;padding:16px;display:flex;flex-direction:column;gap:7px;color:var(--ink)}.knowledge-card:hover{border-color:#9ab7a7;background:#fbfdfb}.knowledge-card .tag{font-size:10px;color:var(--green);font-weight:700}.knowledge-card strong{font-size:15px}.knowledge-card small{color:var(--muted);font-size:11px}.quiz-toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px}.quiz-toolbar h1{margin:0;font-size:27px}.toolbar-actions{display:flex;align-items:center;gap:8px}.quiz-progress{margin:20px 0 14px;display:grid;grid-template-columns:1fr auto;gap:8px 12px;font-size:12px;color:var(--muted)}.progress-track{height:4px;background:#e3e9e5;grid-column:1/-1}.progress-track i{display:block;height:100%;width:0;background:var(--green);transition:width .2s}.question-panel{background:#fff;border:1px solid var(--line);padding:26px 30px;min-height:300px}.q-meta{display:flex;gap:8px;margin-bottom:16px}.q-meta span{font-size:11px;background:#edf2ef;padding:3px 8px;border-radius:3px;color:#52645b}.q-stem{font-size:19px;font-weight:650;line-height:1.6;margin:0 0 21px}.option-list{display:grid;gap:9px}.option{width:100%;min-height:46px;border:1px solid var(--line);background:#fff;text-align:left;padding:10px 12px;display:flex;gap:12px;align-items:flex-start;color:var(--ink)}.option:hover:not(:disabled){border-color:#9ab7a7;background:#f8fbf9}.option.selected{border-color:var(--green);background:#edf5f0}.option.correct{border-color:#67a487;background:#eef7f1}.option.incorrect{border-color:#cd897e;background:#fff4f1}.option-key{height:23px;width:23px;flex:none;border-radius:50%;display:grid;place-items:center;background:#eff2f0;color:#52645b;font-size:12px;font-weight:700}.option.correct .option-key{background:#cde7d8;color:#14583f}.option.incorrect .option-key{background:#f4d5cf;color:#842f23}.feedback{margin-top:18px;padding:16px;background:#f6f8f6;border-left:3px solid var(--green)}.feedback.wrong-feedback{border-color:var(--red)}.feedback strong,.feedback small{display:block}.feedback small{margin-top:5px;color:var(--muted)}.feedback p{margin:10px 0}.feedback .source{font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:9px}.quiz-actions{display:flex;justify-content:space-between;gap:10px;margin-top:12px}.quiz-actions #submit-answer{margin-left:auto}.quiz-empty{padding:40px;text-align:center;color:var(--muted);background:#fff;border:1px solid var(--line)}.back-link{border:0;background:none;color:var(--green);padding:7px 0;margin-bottom:14px}.knowledge-detail{background:#fff;border:1px solid var(--line);padding:26px}.knowledge-detail h1{margin:2px 0 5px;font-size:28px}.knowledge-detail .source{font-size:12px;color:var(--muted)}.point-list{padding:0;list-style:none;margin:24px 0;display:grid;gap:10px}.point-list li{padding:13px 14px;background:#f6f8f6;border-left:3px solid #9ab7a7}.review-note{font-size:13px;color:var(--muted)}.review-list{display:grid;gap:8px}.review-card{border:1px solid var(--line);background:white;padding:16px}.review-card-head{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:11px}.review-card h3{font-size:15px;line-height:1.5}.review-card .review-answer{color:var(--green);font-weight:650}.review-card button{margin-top:8px}.empty-state{background:#fff;border:1px solid var(--line);padding:34px;text-align:center;color:var(--muted)}.footer-note{max-width:1120px;margin:0 auto;padding:0 22px 20px;color:#78867f;font-size:11px}.bottom-nav{position:fixed;z-index:5;bottom:0;left:0;right:0;display:flex;justify-content:center;background:rgba(255,255,255,.97);border-top:1px solid var(--line);padding:6px max(10px,calc((100% - 450px)/2));backdrop-filter:blur(12px)}.nav-item{flex:1;max-width:150px;background:none;border:0;color:var(--muted);font-size:11px;display:grid;justify-items:center;gap:1px;padding:5px}.nav-item span{font-size:20px;line-height:1.1}.nav-item.active{color:var(--green);font-weight:700}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:700px){body{font-size:15px}.topbar{height:64px;padding:0 16px}main{padding:16px 14px 30px}.intro-band{min-height:190px;padding:22px 20px}.intro-band h1{font-size:27px;max-width:75%}.intro-copy{font-size:13px;max-width:76%}.intro-figure{position:absolute;right:3px;opacity:.75;transform:scale(.72);transform-origin:right center}.metrics{grid-template-columns:repeat(2,1fr);margin:12px 0 26px}.metrics>div{padding:12px 15px;border-bottom:1px solid var(--line)}.metrics>div:nth-child(2){border-right:0}.metrics>div:nth-child(n+3){border-bottom:0}.metrics strong{font-size:20px}.start-row{flex-wrap:wrap;padding:12px}.start-row>.button{flex:1}.start-row .select-wrap{width:100%}.start-row select{width:100%}.knowledge-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.knowledge-card{min-height:116px;padding:12px}.knowledge-card strong{font-size:13px}.section-title h2{font-size:17px}.section-title>span{font-size:11px}.quiz-toolbar{align-items:flex-start}.quiz-toolbar h1{font-size:23px}.toolbar-actions{flex-direction:column;align-items:stretch}.toolbar-actions select{max-width:155px}.question-panel{padding:20px 15px;min-height:260px}.q-stem{font-size:17px}.option{font-size:14px;padding:10px}.quiz-actions{display:grid;grid-template-columns:1fr 1fr}.quiz-actions #submit-answer{grid-column:1/-1;grid-row:1;margin:0}.quiz-actions #prev-question{grid-column:1;grid-row:2}.quiz-actions #next-question{grid-column:2;grid-row:2}.knowledge-detail{padding:20px 16px}.knowledge-detail h1{font-size:24px}.review-card{padding:13px}.footer-note{padding:0 14px 14px;font-size:10px}}
@media(max-width:360px){.knowledge-grid{grid-template-columns:1fr}.intro-figure{opacity:.45}.toolbar-actions select{max-width:130px}.quiz-toolbar h1{font-size:20px}}