*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--sidebar-w: 256px;--header-h: 52px;--bg: #f8f7f4;--surface: #ffffff;--sidebar-bg: #18181b;--sidebar-fg: #a1a1aa;--sidebar-hover: #27272a;--sidebar-active-bg: #3f3f46;--sidebar-active-fg: #fafafa;--sidebar-section: #52525b;--border: #e4e4e7;--text: #18181b;--text-muted: #71717a;--accent: #b45309;--accent-light: #fef3c7;--font: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;--leading: 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span{display:block;width:20px;height:2px;background:var(--text-muted);border-radius:2px}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:99}@media(max-width:768px){:root{--sidebar-w: 280px}.sidebar{position:fixed;left:0;top:0;bottom:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay.show{display:block}.menu-btn{display:flex}.content-area{padding:20px 18px}.topbar{padding:0 16px}.book-grid{grid-template-columns:1fr}.reader-panel{width:100vw}.reader-body{padding:24px 20px}.md-content h1{font-size:18px}.md-content h2{font-size:16px}}