:root{--red:#B93A32;--amber:#D98A3A;--ink:#252322;--paper:#FAF8F5;--soft:#F2EDE7;--body:#3B3836;--muted:#77716D;--accent:#E05A3F;--line:#ded6cf;--shadow:0 18px 45px rgba(37,35,34,.09);--radius:22px;--shell:min(1180px,calc(100% - 36px))}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--body);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.75}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}a:hover{color:var(--red)}button,input,textarea{font:inherit}.shell{width:var(--shell);margin-inline:auto}.skip-link{position:absolute;left:-9999px;top:8px}.skip-link:focus{left:8px;z-index:1000;background:var(--ink);color:white;padding:10px 14px;border-radius:8px}.site-header{position:sticky;top:0;z-index:50;background:rgba(250,248,245,.94);backdrop-filter:blur(12px);border-bottom:1px solid 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