:root{--bg:#F3F7FB;--deep:#E6EFF7;--panel:#fff;--sub:#DCEBF5;--ink:#10263A;--text:#263B4C;--muted:#60788C;--soft:#8094A5;--blue:#3B9FE0;--bright:#67B9EC;--steel:#1E6FB8;--ice:#B8DDF3;--mint:#39A69C;--border:rgba(30,111,184,.16);--strong:rgba(59,159,224,.38);--shadow:0 14px 36px rgba(16,38,58,.08);--header:72px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",Arial,sans-serif;font-size:16px;line-height:1.8;overflow-x:hidden}body.layer-open{overflow:hidden}img{display:block;max-width:100%;height:auto}a{color:var(--steel);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid 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