:root{--bg:#f8fafc;--panel:#fff;--ink:#172033;--muted:#64748b;--line:#e5eaf2;--brand:#6256e8;--brand2:#27c7bd;--soft:#f1f0ff;--danger:#d33b5c;color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,PingFang SC,Microsoft Yahei,Arial,sans-serif}body.dark{--bg:#101426;--panel:#181d31;--ink:#f2f4fb;--muted:#aeb8d0;--line:#2b3552;--brand:#8d83ff;--brand2:#4cdbd0;--soft:#23203d;color-scheme:dark}button,input,select,textarea{font:inherit}.page{min-height:100vh}.shell{width:min(1160px,calc(100% - 32px));margin:auto}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid 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