:root{--bg:#f6f8fa;--bg-alt:#eef2f5;--surface:#ffffff;--surface-soft:#fbfcfd;--ink:#1f2933;--ink-soft:#3e4c59;--muted:#6b7a88;--line:#e3e8ee;--primary:#1f6f8b;--primary-dark:#175a70;--primary-soft:#e3eef3;--accent:#b8772f;--shadow-sm:0 1px 2px rgba(30, 41, 51, 0.05), 0 2px 8px rgba(30, 41, 51, 0.05);--shadow-md:0 4px 14px rgba(30, 41, 51, 0.09), 0 1px 3px rgba(30, 41, 51, 0.06);--radius:14px;--radius-sm:10px;--font-sans:-apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;--font-mono:"SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, "Liberation Mono", monospace;--reader-size:1.02rem;--content-width:1140px;--reading-width:46rem}*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.7;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img{max-width:100%;height:auto}a{color:var(--primary-dark);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{line-height:1.3;color:var(--ink);margin:0 0 .5em;font-weight:700}.container{width:100%;max-width:var(--content-width);margin:0 auto;padding:0 20px}.skip-link{position:absolute;left:-999px;top:0;background:var(--primary);color:#fff;padding:8px 16px;border-radius:0 0 8px 0;z-index:100}.skip-link:focus{left:0}code,pre,kbd{font-family:var(--font-mono)}.site-header{position:sticky;top:0;z-index:50;background:rgba(246,248,250,.92);backdrop-filter:saturate(150%)blur(8px);border-bottom:1px solid 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