:root{font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:#262923;background:#f7f7f0;--accent:#475c47;--soft:#e5ebdf;--line:#dce1d4}*{box-sizing:border-box}body{margin:0}body[data-theme=blue]{--accent:#285c8c;--soft:#e3edf6}body[data-theme=forest]{--accent:#277460;--soft:#ddf0e7}header,main,footer{max-width:1080px;margin:auto}header{display:flex;justify-content:space-between;gap:20px;padding:25px 24px;border-bottom:1px solid var(--line);font-size:13px}a{color:inherit}main{padding:36px 24px}footer{padding:24px;color:#6b7167;font-size:12px}.hero{margin:24px 0 34px}.eyebrow{letter-spacing:.16em;font-size:12px;color:var(--accent)}h1{font-family:Georgia,"Songti SC",serif;font-size:clamp(30px,5vw,48px);font-weight:500;line-height:1.35;margin:12px 0}h2{font-size:21px;font-weight:600;margin:0 0 16px}h3{font-size:17px;margin:24px 0 12px}p{line-height:1.65}.muted{color:#697263;font-size:14px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:25px 0}.metric,.panel,aside{border:1px solid var(--line);border-radius:14px;background:#fff;padding:24px}.metric strong{display:block;font-family:Georgia,serif;font-weight:500;font-size:32px;color:var(--accent);margin:8px 0}.metric span{color:#697263;font-size:13px}.panel{margin:20px 0}.chart{display:flex;align-items:flex-end;gap:10px;height:260px;padding:20px 0 0}.column{display:flex;flex:1;min-width:25px;flex-direction:column;align-items:center;justify-content:flex-end;height:100%;gap:8px;font-size:13px}.bar{background:var(--accent);border-radius:5px 5px 0 0;width:min(65px,80%);min-height:1px}.bar:hover{filter:brightness(1.2)}.horizontal{display:grid;height:auto;gap:12px}.horizontal .column{display:grid;grid-template-columns:45px 1fr 60px;align-items:center;gap:12px}.horizontal .bar{height:24px;border-radius:4px;grid-column:2;grid-row:1}.horizontal .score{grid-column:1;grid-row:1}.horizontal .count{grid-column:3;grid-row:1}.point{display:grid;grid-template-columns:minmax(120px,1fr) 2fr 75px;gap:12px;align-items:center;margin:16px 0}.track{background:var(--soft);height:10px;border-radius:5px;overflow:hidden}.fill{height:100%;background:var(--accent)}.point small{display:block;font-size:12px;color:#73796d;margin-top:5px}.point .value{text-align:right;font-variant-numeric:tabular-nums}aside{margin-top:38px;background:var(--soft)}label{display:block;margin:15px 0 8px;font-size:14px}textarea,input{font:inherit;width:100%;border:1px solid #a8b4a0;border-radius:8px;background:#fff;color:#262923;padding:12px}textarea{resize:vertical}button{font:inherit;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:12px 20px;margin-top:12px;cursor:pointer}button:disabled{opacity:.55;cursor:wait}.message{padding:12px 14px;border-left:3px solid var(--accent);background:#ffffffaa;margin:12px 0;white-space:pre-wrap;font-size:14px}li{line-height:1.7;margin:10px 0}[hidden]{display:none!important}@media(max-width:600px){header{padding:18px;gap:10px}main{padding:20px 16px}.metrics{grid-template-columns:repeat(2,1fr);gap:10px}.metric,.panel,aside{padding:18px}.point{grid-template-columns:1fr 1fr 50px;gap:8px}.chart{gap:4px}.column{font-size:11px}footer{padding:20px 16px}}
.study-guide{border-top:4px solid var(--accent)}.study-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.study-group{padding:20px;background:var(--soft);border-radius:10px;overflow-wrap:anywhere}.study-group h4{font-size:17px;margin:0 0 10px}.study-group ul{padding-left:21px}.study-group p{font-size:14px}.practice-label{font-weight:650;margin-bottom:0}.study-steps{padding-left:24px}.study-steps li{padding-left:6px;margin:18px 0}.study-steps p{margin:6px 0}.answer-frame{padding:18px;border-left:3px solid var(--accent);background:var(--soft);overflow-wrap:anywhere}.self-check{margin-top:22px;border-top:1px solid var(--line);padding-top:18px}.self-check summary{cursor:pointer;font-weight:600;line-height:1.7}.self-check summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}.self-check ul{padding-left:22px}@media(max-width:700px){.study-groups{grid-template-columns:1fr}.study-group{padding:16px}}