: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}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75;overflow-x:hidden}a{color:var(--blue2);text-decoration:none}a:hover{text-decoration:underline}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible{outline:3px solid rgba(63,143,229,.35);outline-offset:3px}.wrap{width:min(calc(100% - 40px),var(--max));margin:auto}.skip-link{position:fixed;left:12px;top:-80px;z-index:9999;background:#fff;padding:10px 14px;border:1px solid var(--line)}.skip-link:focus{top:12px}.safety-strip{background:var(--soft2);font-size:13px;color:#36516c;border-bottom:1px solid var(--line);padding:8px 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@media(max-width:520px){.safety-strip{font-size:12px}.header-actions{gap:5px}.lang-switch{min-width:34px}.hero h1{font-size:39px}.hero-sub{font-size:18px}.task-nav{grid-template-columns:1fr}.task-item{border-right:0}.step:nth-child(even){margin-left:0}.step{grid-template-columns:58px 1fr}.update-row{grid-template-columns:1fr;gap:4px}.footer-grid{grid-template-columns:1fr}.glossary{grid-template-columns:1fr}.maintenance-card{padding:28px 20px}.maintenance-card h1{font-size:30px}}