:root{--bg: #f5f7fa;--card: #ffffff;--ink: #0f172a;--muted: #64748b;--brand: #059669;--brand-dark: #047857;--brand-ink: #ffffff;--accent: #f59e0b;--accent-ink: #ffffff;--line: #e8ebef;--line-strong: #d6dbe2;--radius: 16px;--radius-sm: 10px;--maxw: 1120px;--shadow: 0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);--shadow-lg: 0 12px 40px rgba(15,23,42,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased}a{color:inherit}.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}img{max-width:100%;display:block}.site-header{position:sticky;top:0;z-index:50;background:#ffffffd1;backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid 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