: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:1240px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.72;overflow-x:hidden}a{color:var(--blue2);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}.safety-strip{background:var(--soft2);color:#294d70;padding:9px 20px;text-align:center;font-size:14px;border-bottom:1px solid var(--line)}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid rgba(220,231,242,.9)}.header-inner{max-width:var(--max);margin:auto;height:76px;display:flex;align-items:center;gap:28px;padding:0 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@media(max-width:520px){.header-inner{padding:0 14px;gap:10px}.brand span{display:none}.header-actions{margin-left:auto}.header-actions .download-btn{padding:0 12px}.safety-strip{text-align:left;padding:9px 14px}.container,.hero-inner,.article-shell,.footer-grid,.footer-bottom{padding-left:16px;padding-right:16px}.hero h1{font-size:39px}.task-nav{grid-template-columns:1fr}.task-item{border-right:0}.footer-grid{grid-template-columns:1fr}.section{padding:48px 0}.article-hero{padding:44px 0 32px}.compare{font-size:14px}.table-wrap{overflow-x:auto}.header-actions .lang-link{min-width:34px}}