:root{--ink:#121a22;--muted:#59636c;--paper:#f5f3ed;--white:#fff;--accent:#00bdb5;--gold:#dcae58;--line:#d9ddd8;--measure:720px;--wide:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:Georgia,"Times New Roman",serif}a{color:inherit}.book-top{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px max(20px,calc((100vw - var(--wide))/2));background:#121a22f5;color:#fff;font-family:Arial,sans-serif}.book-brand{text-decoration:none;font-weight:800}.book-brand span{color:var(--accent)}.book-top nav{display:flex;gap:16px;align-items:center}.book-top nav a{color:#d8dfdc;text-decoration:none;font-size:.9rem}.toc-button{border:1px solid #ffffff55;background:transparent;color:#fff;border-radius:4px;padding:8px 12px;cursor:pointer}.book-cover{min-height:76vh;display:grid;align-items:end;background:radial-gradient(circle at 78% 20%,#1d7875 0,#172c34 34%,#10171e 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h2{font-size:2.2rem;line-height:1.06;margin:1.8em 0 .55em}.prose h3{font-size:1.45rem;margin-top:1.8em}.prose blockquote{margin:2em 0;padding:20px 26px;border-left:4px solid var(--accent);background:#e8efec;font-size:1.3rem;line-height:1.5}.prose figure{margin:42px 0}.prose img,.prose video{width:100%;height:auto;display:block;background:#111}.prose figcaption{padding:10px 0;color:var(--muted);font: .88rem/1.5 Arial,sans-serif}.chapter-footer{display:flex;justify-content:space-between;gap:18px;margin-top:65px;padding-top:26px;border-top:1px solid var(--line);font:700 .95rem Arial,sans-serif}.chapter-footer a{text-decoration:none;color:#087f78}.toc-drawer{position:fixed;inset:0 0 0 auto;z-index:50;width:min(410px,92vw);padding:34px;background:#fff;box-shadow:-20px 0 60px #0004;transform:translateX(105%);transition:.2s;overflow:auto;font-family:Arial,sans-serif}.toc-drawer.open{transform:translateX(0)}.toc-drawer 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h1{font-size:clamp(3.4rem,17vw,5.4rem)}.chapter-list{grid-template-columns:1fr}.chapter-nav{position:static;display:none}.index-grid{columns:1}.chapter-layout{padding-top:44px}.chapter-hero-inner{padding-top:58px}.publish-ribbon a{display:block;margin:12px auto 0;width:max-content}}