:root{--b1:#07549b;--b2:#0879ca;--b3:#159cdd;--c:#3bc2ee;--page:#f2f7fa;--card:#fff;--border:#dce8ef;--title:#123a5b;--text:#587287;--muted:#8a9ca9;--grad:linear-gradient(110deg,#0875ba 0%,#0b92d5 55%,#22b9e0 100%);--shadow:0 18px 50px rgba(29,94,135,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--page);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}a{text-decoration:none;color:inherit}.fh-shell{width:min(1180px,calc(100% - 40px));margin:auto}
.fh-top{position:sticky;top:0;z-index:1000;background:#fff;border-bottom:1px solid #dceaf3;box-shadow:0 10px 30px rgba(38,105,145,.08)}.fh-top-inner{height:78px;display:flex;align-items:center;gap:28px}.fh-brand{display:flex;align-items:center;gap:11px;min-width:190px}.fh-mark{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:var(--grad);color:#fff;font-weight:900;box-shadow:0 12px 26px rgba(11,134,197,.22)}.fh-brand>span:last-child{display:flex;flex-direction:column;line-height:1.2}.fh-brand strong{color:var(--title);font-size:16px}.fh-brand small{color:var(--muted);font-size:11px;margin-top:4px}.fh-nav{display:flex;flex:1;gap:4px}.fh-nav a{padding:10px 13px;border-radius:11px;font-size:14px;font-weight:650;color:#5c7486}.fh-nav a:hover,.fh-nav a.active{color:var(--b2);background:#eef8fd}.fh-actions{display:flex;gap:9px}.fh-btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 17px;border-radius:12px;font-size:14px;font-weight:800;border:1px solid transparent;transition:.2s}.fh-btn:hover{transform:translateY(-1px)}.fh-btn.ghost{background:#fff;border-color:var(--border);color:var(--b2)}.fh-btn.primary{background:var(--grad);color:#fff;box-shadow:0 12px 26px rgba(11,134,197,.20)}.fh-btn.large{min-height:48px;padding:0 21px}
.fh-hero{padding:76px 0 88px;background:radial-gradient(circle at 82% 18%,rgba(59,194,238,.20),transparent 28%),linear-gradient(180deg,#fafdff 0%,#eef8fd 100%);border-bottom:1px solid #e1eef5}.fh-hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:58px;align-items:center}.fh-kicker{display:inline-block;color:var(--b2);font-size:12px;font-weight:900;letter-spacing:.12em;margin-bottom:12px}.fh-hero h1{margin:0;color:var(--title);font-size:clamp(40px,5vw,66px);line-height:1.08;letter-spacing:-.04em}.fh-hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}.fh-hero p{max-width:700px;font-size:17px;color:#607b8f}.fh-search{margin-top:28px;display:flex;max-width:690px;background:#fff;border:1px solid #d7e9f3;padding:7px;border-radius:17px;box-shadow:0 10px 30px rgba(38,105,145,.08)}.fh-search input{flex:1;min-width:0;border:0;outline:0;padding:0 14px;background:transparent;color:var(--title);font-size:14px}.fh-search button{border:0;background:var(--grad);color:#fff;border-radius:12px;padding:12px 18px;font-weight:800}.fh-hero-meta{display:flex;flex-wrap:wrap;gap:12px 20px;margin-top:18px;color:#7b92a2;font-size:13px}.fh-hero-meta strong{color:var(--b2)}.fh-hero-panel{padding:31px;border-radius:27px;color:#fff;background:linear-gradient(145deg,#064a8f,#087dca 55%,#18a8dc);box-shadow:0 28px 65px rgba(5,81,143,.25)}.fh-hero-panel>span{font-size:12px;font-weight:900;letter-spacing:.12em;opacity:.85}.fh-hero-panel h2{font-size:25px;line-height:1.3}.fh-hero-panel ul{list-style:none;padding:0;margin:0;display:grid;gap:10px}.fh-hero-panel li{padding:11px 13px;border-radius:12px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.12);font-size:13px}
.fh-cats{margin-top:-26px;position:relative;z-index:3;background:#fff;padding:10px;display:flex;gap:7px;overflow:auto;border:1px solid var(--border);border-radius:18px;box-shadow:0 10px 30px rgba(38,105,145,.08)}.fh-cats a{white-space:nowrap;padding:9px 13px;border-radius:11px;font-size:13px;font-weight:800;color:#658095}.fh-cats a span{margin-left:6px;background:#eef5f9;border-radius:999px;padding:3px 7px;font-size:11px}.fh-cats a.active,.fh-cats a:hover{background:#eaf7fd;color:var(--b2)}
.fh-block,.fh-related{padding-top:62px}.fh-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:22px}.fh-heading h2{margin:0;color:var(--title);font-size:30px;letter-spacing:-.02em}.fh-heading p{margin:0;max-width:520px;text-align:right;color:#7a91a1;font-size:13px}.fh-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.fh-card{background:#fff;border:1px solid var(--border);border-radius:20px;padding:22px;box-shadow:0 9px 28px rgba(46,103,138,.06);display:flex;flex-direction:column;min-height:270px;transition:.22s}.fh-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#c9e1ef}.fh-card.featured{background:linear-gradient(180deg,#fff,#f9fdff);border-color:#c8e7f6}.fh-card-top{display:flex;justify-content:space-between;gap:10px;color:#9aabb6;font-size:11px}.fh-pill{display:inline-flex;padding:5px 9px;border-radius:999px;background:#eaf7fd;color:#087bc1;font-size:11px;font-weight:850}.fh-card h3{margin:16px 0 10px;color:var(--title);font-size:19px;line-height:1.45}.fh-card h3 a:hover{color:var(--b2)}.fh-card p{margin:0;color:#6d8495;font-size:13px;flex:1}.fh-card-meta{display:flex;justify-content:space-between;margin-top:18px;padding-top:15px;border-top:1px solid #edf3f6;font-size:11px;color:#9aaab5}.fh-card-meta a{color:var(--b2);font-weight:850}.fh-empty{padding:40px;background:#fff;border:1px dashed #bfd9e8;border-radius:18px;text-align:center}
.fh-principles{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:62px 0 78px}.fh-principles>div{padding:30px;border-radius:24px;background:#fff;border:1px solid var(--border);box-shadow:0 10px 30px rgba(38,105,145,.08)}.fh-principles .dark{background:linear-gradient(145deg,#082d4a,#075a9d);color:#d8eef9;border:0}.fh-principles h2{color:var(--title);font-size:24px;margin:4px 0 9px}.fh-principles .dark h2,.fh-principles .dark .fh-kicker{color:#fff}.fh-principles p{margin:0;font-size:14px}
.fh-breadcrumb{display:flex;gap:9px;align-items:center;padding-top:28px;color:#8399a8;font-size:12px}.fh-article-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:34px;padding-top:24px}.fh-article{background:#fff;border:1px solid var(--border);border-radius:26px;padding:42px 48px;box-shadow:0 10px 30px rgba(38,105,145,.08)}.fh-article-head h1{margin:14px 0;color:var(--title);font-size:clamp(31px,4vw,46px);line-height:1.2;letter-spacing:-.035em}.fh-article-head .lead{font-size:16px;color:#657f91}.fh-muted,.fh-byline{color:#9aabb5;font-size:12px}.fh-quick{margin:28px 0;padding:18px 20px;border-radius:16px;background:#edf9fe;border:1px solid #cdebf8;color:#4f738a;font-size:13px}.fh-quick strong{color:#0b7fbe}.fh-section h2{color:var(--title);font-size:25px;margin:30px 0 12px;padding-left:14px;border-left:4px solid var(--b3)}.fh-section p{margin:0 0 14px;color:#506d80;font-size:15px;line-height:1.95}.fh-faq details{border:1px solid #e2edf3;border-radius:14px;margin:10px 0;background:#fbfdfe}.fh-faq summary{cursor:pointer;padding:15px 17px;color:var(--title);font-weight:800;font-size:14px}.fh-faq details p{padding:0 17px 15px;margin:0;font-size:14px}.fh-note{margin-top:28px;padding:17px 18px;border-radius:14px;background:#fff9ec;border:1px solid #f4dfad;color:#82672d;font-size:13px}.fh-cta{margin-top:34px;padding:27px;border-radius:21px;background:linear-gradient(135deg,#eef9fe,#f9fdff);border:1px solid #cae7f4;display:flex;justify-content:space-between;gap:24px;align-items:center}.fh-cta h2{margin:2px 0 6px;color:var(--title);font-size:21px}.fh-cta p{margin:0;font-size:13px}.fh-cta>div:last-child{display:flex;gap:9px;flex-shrink:0}.fh-toc>div{position:sticky;top:104px;background:#fff;border:1px solid var(--border);border-radius:18px;padding:20px;box-shadow:0 10px 30px rgba(38,105,145,.08)}.fh-toc strong{color:var(--title)}.fh-toc ol{padding-left:19px}.fh-toc li{margin:7px 0;color:#7790a1;font-size:12px}.fh-related{padding-bottom:72px}
.fh-footer{margin-top:10px;background:#061f33;color:#9bb5c7;padding:42px 0 24px}.fh-footer-grid{display:flex;justify-content:space-between;gap:40px}.fh-footer-grid strong{color:#fff}.fh-footer-grid p{font-size:13px}.fh-footer-grid>div:last-child{display:flex;gap:20px}.fh-copy{margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.08);font-size:11px;color:#6f8da2}
@media(max-width:1020px){.fh-nav{display:none}.fh-hero-grid{grid-template-columns:1fr}.fh-grid{grid-template-columns:repeat(2,1fr)}.fh-article-layout{grid-template-columns:1fr}.fh-toc{display:none}}
@media(max-width:720px){.fh-shell{width:min(100% - 24px,1180px)}.fh-top-inner{height:68px}.fh-brand{min-width:0;flex:1}.fh-brand small,.fh-actions .ghost{display:none}.fh-btn{min-height:39px;padding:0 13px}.fh-hero{padding:50px 0 70px}.fh-hero h1{font-size:39px}.fh-search{display:block}.fh-search input{width:100%;height:44px}.fh-search button{width:100%}.fh-grid{grid-template-columns:1fr}.fh-heading{display:block}.fh-heading p{text-align:left;margin-top:8px}.fh-principles{grid-template-columns:1fr}.fh-article{padding:26px 20px;border-radius:20px}.fh-article-head h1{font-size:32px}.fh-cta{display:block}.fh-cta>div:last-child{margin-top:17px;display:grid}.fh-footer-grid{display:block}.fh-footer-grid>div:last-child{margin-top:20px;flex-wrap:wrap}}