:root{--paper:#FFF8F2;--white:#FFFFFF;--soft:#F3EBE3;--ink:#1A1230;--text:#2C2440;--muted:#5A5270;--faint:#8A8298;--pink:#E11D8F;--indigo:#6366F1;--cyan:#0891B2;--amber:#D97706;--mint:#059669;--line:rgba(26,18,48,.10);--shadow:0 14px 34px rgba(26,18,48,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.75;overflow-x:hidden}body.locked{overflow:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}.wrap{width:min(1160px,calc(100% - 32px));margin:0 auto}.masthead{position:fixed;left:0;right:0;top:0;height:72px;background:rgba(255,248,242,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);z-index:40}.masthead-inner{width:min(1160px,calc(100% - 32px));height:100%;margin:auto;display:grid;grid-template-columns:1fr auto 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var(--line);box-shadow:var(--shadow);border-radius:18px}.tag-card{padding:18px;min-height:142px}.dot{width:10px;height:10px;border-radius:50%;display:inline-block;margin-right:8px}.dot.pink{background:var(--pink)}.dot.indigo{background:var(--indigo)}.dot.cyan{background:var(--cyan)}.dot.amber{background:var(--amber)}.tag-card h3,.card h3,.info-card h3{color:var(--ink);margin:10px 0 6px}.tag-card p,.card p,.info-card p{margin:0;color:var(--muted)}.text-link{display:inline-flex;margin-top:12px;color:var(--indigo);font-weight:800}.split{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}.split.no-media{grid-template-columns:1fr}.content-image{max-height:340px;object-fit:contain;margin:auto}.chapter-list{display:grid;gap:12px;margin-top:20px}.chapter-list a{display:grid;grid-template-columns:54px 1fr;gap:14px;padding:14px 0;border-top:1px solid var(--line)}.chapter-list b{font-size:24px;color:var(--pink)}.masonry-three{display:grid;grid-template-columns:1fr 1.05fr 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@media(max-width:700px){.chapter-nav{display:none}.site-main{padding-top:72px;padding-bottom:56px}.masthead-inner{grid-template-columns:52px 1fr 84px;gap:8px}.masthead-actions .search-trigger{display:none}.app-link{padding:0 12px;font-size:14px}.brand-logo{max-width:150px}.hero,.page-hero{padding-top:34px}.hero-grid,.split,.article-grid{grid-template-columns:1fr}.hero-media{order:-1}.hero-media img{margin:auto}.eyebrow{writing-mode:horizontal-tb;float:none;margin:0 0 10px;display:block}.tag-grid,.step-grid,.theme-grid{grid-template-columns:1fr}.shelf-row{grid-template-columns:1fr}.book-pages{grid-template-columns:1fr}.book-page:first-child{border-right:0;border-bottom:1px solid var(--line)}.book-menu{max-height:88vh}.footer-groups{grid-template-columns:1fr 1fr}.mobile-bottom{display:grid;position:fixed;left:0;right:0;bottom:0;height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);grid-template-columns:repeat(5,1fr);background:#fff;border-top:1px solid var(--line);z-index:45}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--muted)}.mobile-bottom a.active{color:var(--pink);font-weight:800}.site-footer{padding-bottom:100px}.rank-item{grid-template-columns:58px 1fr}.rank-num{font-size:34px}}