:root{--bg:#F4FAFC;--white:#fff;--soft:#E7F3F6;--title:#0E3A46;--text:#24505A;--muted:#4A7380;--aux:#7A9AA4;--sea:#1A7F8F;--bright:#2BB3C4;--deep:#0F5B68;--pale:#D7EEF2;--border:rgba(26,127,143,.16);--shadow:0 14px 34px rgba(14,58,70,.08);--header:72px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden;padding-top:var(--header)}body.locked{overflow:hidden}a{color:inherit;text-decoration:none}a:hover{color:var(--sea)}button,input{font:inherit}button{cursor:pointer}.shell{width:min(1200px,calc(100% - 32px));margin-inline:auto}.site-header{position:fixed;inset:0 0 auto;z-index:50;height:var(--header);background:rgba(255,255,255,.96);border-bottom:1px solid var(--border);backdrop-filter:blur(12px)}.topbar{height:100%;display:grid;grid-template-columns:220px 1fr 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