:root{--bg: #f6f7fb;--bg-elev: #ffffff;--text: #1f2430;--muted: #6b7280;--line: #e6e8ef;--brand: #2563eb;--brand-soft: #eef2ff;--ok: #047857;--warn: #b45309;--shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);--radius: 14px}[data-theme=dark]{--bg: #0f1115;--bg-elev: #171a21;--text: #e6e8ef;--muted: #9aa3b2;--line: #262b36;--brand: #60a5fa;--brand-soft: #16233f;--shadow: 0 1px 3px rgba(0, 0, 0, .4)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.7 -apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{max-width:1080px;margin:0 auto;padding:0 18px}.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg-elev) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid 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