:root{--bg: #f7f8fa;--surface: #ffffff;--surface-2: #f1f3f6;--fg: #1c2230;--muted: #6b7280;--border: #e5e8ee;--accent: #4f46e5;--accent-weak: #eef0ff;--ok: #16a34a;--ok-weak: #e7f7ec;--warn: #d97706;--danger: #dc2626;--danger-weak: #fdeaea;--radius: 14px;--radius-sm: 9px;--shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 6px 18px rgba(16, 24, 40, .06);--maxw: 1240px;--preview-size: 22px;--header-h: 60px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--fg);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%}.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{position:sticky;top:0;z-index:50;height:var(--header-h);display:flex;align-items:center;background:#ffffffdb;backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid 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