:root{--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--text: #363636;--text-strong: #1a1a1a;--text-muted: #6b7280;--text-faint: #8b959e;--link: #346ddb;--border: #e6e8eb;--bg: #ffffff;--bg-subtle: #f7f8fa;--header-h: 56px;--sidebar-w: 250px;--toc-w: 250px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-sans);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);display:flex;align-items:center;padding:0 20px;background:var(--bg);border-bottom:1px solid var(--border);z-index:100}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text-strong)}.brand:hover{text-decoration:none}.logo{width:30px;height:30px;border-radius:8px;display:block;object-fit:cover}.brand-title{font-size:15.5px;font-weight:700;letter-spacing:-.01em}.app{padding-top:var(--header-h)}.layout{display:flex;align-items:flex-start}.sidebar{position:sticky;top:var(--header-h);width:var(--sidebar-w);flex-shrink:0;height:calc(100vh - 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