:root{--bg:#091321;--surface:#111e31;--surface-soft:#142b43;--text:#eef5ff;--muted:#a8b8cc;--line:rgba(190,218,241,.16);--accent:#24d7d2;--accent-dark:#8af0e8;--teal:#24d7d2;--max:1160px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:PingFang SC,Microsoft YaHei,system-ui,-apple-system,sans-serif;line-height:1.7}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}.shell{width:min(var(--max),calc(100% - 40px));margin:0 auto}.site-header{border-bottom:1px solid var(--line);background:rgba(9,19,33,.94);position:-webkit-sticky;position:sticky;top:0;z-index:10;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.nav{min-height:72px;justify-content:space-between;gap:24px}.brand,.nav{display:flex;align-items:center}.brand{gap:11px;font-weight:800;letter-spacing:.04em;font-size:20px}.brand-logo{width:38px;height:38px;object-fit:cover;border-radius:9px;box-shadow:0 0 18px 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