:root{--paper:#f6f5f0;--surface:#fffefa;--ink:#202e2a;--muted:#6d7770;--line:#dce1d8;--accent:#227657;--soft:#e8efe5;--side:#182e29;--code:#20342f;--warning:#faf0d8;--shadow:0 16px 70px #0b271629;font-family:"Segoe UI","Microsoft YaHei",sans-serif;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-size:15px;line-height:1.75}body.dark{--paper:#14241f;--surface:#1a3028;--ink:#e5ede5;--muted:#abbcb1;--line:#385045;--accent:#8ed4ab;--soft:#294337;--code:#101d18;--warning:#383222;color-scheme:dark}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button,.button{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:7px;padding:9px 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@media(min-width:1550px){main{padding-top:65px}.hero{gap:80px}.hero h1{font-size:56px}.hero-note{padding:35px 40px}}
@media(max-width:1150px){.sidebar{width:232px;padding:24px 16px}.shell{margin-left:232px}main{padding:35px 30px 60px}.topbar{padding:0 30px}.hero{gap:25px;grid-template-columns:1.3fr 1fr}.hero-note{padding:24px 20px}.hero h1{font-size:38px}.stage-card{gap:12px;padding:23px 16px}.stats{gap:25px}.topic{padding:27px}.stage-card h3{font-size:16px}}
@media(max-width:900px){.hero{grid-template-columns:1fr}.hero-note{display:none}.hero h1{font-size:42px}.stage-grid{grid-template-columns:1fr}.chapter-toc>div{grid-template-columns:1fr}.topic h2{font-size:22px}.questions-heading span{display:block}.plan-grid{grid-template-columns:1fr}.stats{gap:44px}}
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@media(max-width:1150px) and (min-width:701px){.reading-bar{left:calc(232px + (100% - 232px)/2);width:calc(100% - 264px)}}
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@media print{.reading-bar,#reader-toc{display:none!important}body.is-reading main{padding-bottom:0}.topic>p,.answer p{font-size:11pt}}
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@media print{body,body.dark{--paper:#fff;--surface:#fff;--ink:#111;--muted:#444;--line:#ddd;--soft:#f3f3f3;--warning:#f7f7f7;background:white;color:black}.sidebar,.topbar,footer,.hero-actions,.mastery,.star,.notes,.bank-controls,dialog,#toast,.skip,.chapter-toc,.next-stage{display:none!important}.shell{margin:0}main{max-width:none;padding:0}.topic{border:0;border-bottom:1px solid #ccc;padding:15px 0;border-radius:0;break-inside:auto}.question,.pitfall,.exercise{break-inside:avoid}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#f3f3f3;color:black}.topic p{font-size:11pt}.topic h2{font-size:18pt}.page-heading h1{font-size:25pt}a{color:inherit}.stage-view{max-width:none}body.print-all .stage-view[hidden]{display:block!important}body.print-all .view:not(.stage-view){display:none!important}.stage-view{break-before:page}.stage-view:first-of-type{break-before:auto}}
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