:root{--paper:#f4f8fc;--ice:#e8f1fa;--white:#fff;--light:#f7fbfe;--title:#0e2a44;--ink:#1c3a56;--muted:#3d5c78;--quiet:#6a88a0;--blue:#1e6fd9;--bright:#6ba8f0;--deep:#0e4a9e;--amber:#e2b23a;--coral:#e07a62;--line:rgba(30,111,217,.26);--shadow:0 12px 28px rgba(14,42,68,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:15px/1.75 system-ui,-apple-system,"Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);overflow-x:hidden}a{color:var(--deep);text-decoration:none}a:hover{text-decoration:none}button,input{font:inherit}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--deep);outline-offset:2px}img{max-width:100%}[hidden]{display:none!important}.wrap{max-width:960px;margin:auto;padding:0 16px}.skip-link{position:fixed;z-index:110;left:12px;top:-80px;padding:8px;background:white}.skip-link:focus{top:4px}h1,h2,h3{color:var(--title);line-height:1.4;margin:0 0 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