:root{--bg:#fff;--soft:#f5f8fc;--soft2:#edf4fb;--blue:#3f8fe5;--deep:#245f9e;--night:#153f66;--title:#16283c;--text:#43566a;--muted:#718296;--line:#dce7f2;--tag:#eaf4ff;--footer:#123958;--max:1200px}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.72;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}.skip-link{position:absolute;left:-999px;top:8px;background:#fff;padding:8px;z-index:9999}.skip-link:focus{left:8px}.safety-strip{background:var(--soft2);color:var(--deep);text-align:center;padding:8px 16px;font-size:13px}.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.header-inner{max-width:var(--max);margin:auto;height:72px;display:flex;align-items:center;gap:18px;padding:0 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