:root{--bg:#fff;--soft:#f5f8fc;--soft2:#edf4fb;--blue:#3f8fe5;--blue2:#245f9e;--deep:#153f66;--title:#16283c;--text:#43566a;--muted:#718296;--line:#dce7f2;--tag:#eaf4ff;--footer:#123958;--max:1220px;--shadow:0 18px 45px rgba(24,67,103,.10)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,"Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.72;overflow-x:hidden}img{max-width:100%;height:auto;display:block}a{color:var(--blue2);text-decoration:none}a:hover{text-decoration:underline}button,a{touch-action:manipulation}button{font:inherit}.skip-link{position:absolute;left:-999px;top:8px}.skip-link:focus{left:8px;z-index:999;background:#fff;padding:8px 12px}.safety-strip{padding:8px 20px;text-align:center;background:var(--soft2);color:#365b7d;font-size:13px;border-bottom:1px solid var(--line)}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid 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