:root{--nc4-ink:#17233c;--nc4-muted:#68758c;--nc4-line:#e4e9f0;--nc4-paper:#ffffff;--nc4-bg:#f4f7fb;--nc4-primary:#0e7490;--nc4-primary-dark:#155e75;--nc4-accent:#f59e0b}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--nc4-ink);background:var(--nc4-bg);font-family:Inter,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.75}a{color:inherit}.nc4-wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.nc4-topline{color:#c9d6e7;background:#111c31;font-size:12px}.nc4-topline-inner{display:flex;justify-content:space-between;align-items:center;min-height:34px}.nc4-header{background:var(--nc4-paper);border-bottom:1px solid var(--nc4-line)}.nc4-header-inner{display:flex;align-items:center;justify-content:space-between;min-height:92px;gap:36px}.nc4-brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none}.nc4-brand>span:last-child{display:flex;flex-direction:column;line-height:1.2}.nc4-brand strong{font-size:23px;letter-spacing:1px}.nc4-brand small{margin-top:5px;color:var(--nc4-primary);font-size:10px;letter-spacing:3px}.nc4-brand-mark{width:44px;height:44px;display:grid;grid-template-columns:1fr 1fr;grid-gap:3px;gap:3px;padding:6px;border-radius:12px;background:linear-gradient(145deg,#0e7490,#1d4ed8);box-shadow:0 8px 20px rgba(14,116,144,.22)}.nc4-brand-mark i{display:block;border-radius:3px;background:rgba(255,255,255,.94)}.nc4-brand-mark i:nth-child(2),.nc4-brand-mark i:nth-child(3){opacity:.66}.nc4-search{width:min(460px,45vw);height:46px;display:flex;align-items:center;justify-content:space-between;padding:0 8px 0 18px;border:1px solid #d8e0ea;border-radius:10px;color:#9aa5b5;background:#f8fafc;font-size:14px}.nc4-search b{width:32px;height:32px;display:grid;place-items:center;border-radius:8px;background:var(--nc4-primary);color:white;font-size:21px}.nc4-nav{background:var(--nc4-paper);box-shadow:0 4px 14px rgba(19,39,68,.05)}.nc4-nav-inner{display:flex;align-items:center;gap:38px;min-height:52px}.nc4-nav a{position:relative;text-decoration:none;font-size:15px;font-weight:600}.nc4-nav a:first-child{color:var(--nc4-primary)}.nc4-nav a:first-child:after{content:"";position:absolute;left:0;right:0;bottom:-15px;height:3px;border-radius:2px;background:var(--nc4-primary)}.nc4-main{padding-top:20px;padding-bottom:54px}.nc4-breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:18px;color:var(--nc4-muted);font-size:13px;overflow:hidden;white-space:nowrap}.nc4-breadcrumb a{color:var(--nc4-primary-dark);text-decoration:none}.nc4-breadcrumb span:last-child{overflow:hidden;text-overflow:ellipsis}.nc4-columns{display:grid;grid-template-columns:minmax(0,1fr) 286px;align-items:start;grid-gap:22px;gap:22px}.nc4-content,.nc4-side-card{background:var(--nc4-paper);border:1px solid var(--nc4-line);border-radius:14px;box-shadow:0 10px 32px rgba(31,50,81,.05)}.nc4-content{padding:28px 32px}.nc4-hero{display:grid;grid-template-columns:112px minmax(0,1fr) auto;align-items:center;grid-gap:22px;gap:22px;padding-bottom:26px;border-bottom:1px solid var(--nc4-line)}.nc4-app-icon{position:relative;flex:0 0 auto;width:82px;height:82px;display:grid;place-items:center;overflow:hidden;border-radius:21px;color:white;background:linear-gradient(145deg,#0e7490,#2563eb 60%,#7c3aed);box-shadow:0 10px 24px rgba(37,99,235,.22)}.nc4-app-icon span{position:relative;z-index:2;font-size:34px;font-weight:800}.nc4-app-icon i{position:absolute;width:60px;height:60px;right:-25px;bottom:-25px;border-radius:50%;background:rgba(255,255,255,.2)}.nc4-kicker{margin:0 0 3px;color:var(--nc4-primary);font-size:12px;font-weight:700;letter-spacing:1px}.nc4-hero h1{margin:0;font-size:25px;line-height:1.45;letter-spacing:.2px;overflow-wrap:anywhere}.nc4-lead{margin:8px 0 13px;color:var(--nc4-muted);font-size:14px}.nc4-meta-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:5px 14px;gap:5px 14px;margin:0}.nc4-meta-grid div{display:flex;gap:6px;min-width:0;font-size:13px}.nc4-meta-grid dt{color:#8b96a7}.nc4-meta-grid dd{margin:0;color:#36445c;font-weight:600;white-space:nowrap}.nc4-action{align-self:end;min-width:126px;padding:10px 15px;border-radius:9px;color:white;background:linear-gradient(135deg,var(--nc4-primary),#2563eb);text-align:center;text-decoration:none;font-size:14px;font-weight:700;box-shadow:0 8px 16px rgba(14,116,144,.2)}.nc4-section-nav{display:flex;gap:8px;margin:22px 0 12px;padding:8px;border-radius:10px;background:#f2f7fa;overflow-x:auto}.nc4-section-nav a{flex:1 0 auto;padding:6px 10px;border-radius:7px;color:var(--nc4-primary-dark);text-align:center;text-decoration:none;font-size:13px;font-weight:600}.nc4-section-nav a:hover{background:white}.nc4-section{padding:16px 0 4px}.nc4-section h2{position:relative;margin:0 0 14px;padding-left:15px;font-size:20px;line-height:1.45}.nc4-section h2:before{content:"";position:absolute;left:0;top:.32em;width:5px;height:1em;border-radius:4px;background:linear-gradient(var(--nc4-primary),#3b82f6)}.nc4-section p{margin:10px 0;color:#445169;text-align:justify}.nc4-section ul{margin:12px 0;padding:14px 18px 14px 40px;border-radius:10px;background:#f8fafc;color:#3e4b61}.nc4-section li{margin:5px 0}.nc4-faq details{margin:10px 0;border:1px solid var(--nc4-line);border-radius:10px;background:#fbfcfe}.nc4-faq summary{cursor:pointer;padding:11px 14px;font-weight:700}.nc4-faq details p{margin:0;padding:0 14px 13px;color:var(--nc4-muted)}.nc4-related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:10px;gap:10px}.nc4-related-grid a{display:flex;align-items:center;justify-content:space-between;gap:12px;min-width:0;padding:11px 13px;border:1px solid var(--nc4-line);border-radius:9px;color:#35435b;text-decoration:none;font-size:14px}.nc4-related-grid a:hover{border-color:#8bc7d4;color:var(--nc4-primary-dark)}.nc4-related-grid small{flex:0 0 auto;color:#94a0b1}.nc4-prevnext{display:grid;grid-template-columns:1fr 1fr;grid-gap:18px;gap:18px;margin-top:26px;padding-top:18px;border-top:1px dashed #d5dce6}.nc4-prevnext a{overflow:hidden;color:var(--nc4-primary-dark);text-decoration:none;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.nc4-prevnext a:last-child{text-align:right}.nc4-source{margin:20px 0 0;color:#98a2b2;font-size:12px}.nc4-sidebar{display:grid;grid-gap:18px;gap:18px}.nc4-side-card{padding:18px}.nc4-side-card h2{margin:0 0 14px;padding-bottom:10px;border-bottom:1px solid var(--nc4-line);font-size:17px}.nc4-ranking{list-style:none;margin:0;padding:0}.nc4-ranking li{display:grid;grid-template-columns:24px minmax(0,1fr);align-items:center;grid-gap:8px;gap:8px;padding:9px 0;border-bottom:1px dashed #e8ecf2}.nc4-ranking span{width:20px;height:20px;display:grid;place-items:center;border-radius:5px;color:#708096;background:#edf2f7;font-size:11px;font-weight:700}.nc4-ranking li:nth-child(-n+3) span{color:white;background:var(--nc4-accent)}.nc4-ranking a{overflow:hidden;text-decoration:none;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.nc4-side-tip{border-top:4px solid var(--nc4-primary)}.nc4-side-tip p{margin:0;color:var(--nc4-muted);font-size:13px}.nc4-footer{padding:34px 0;color:#b7c3d5;background:#111c31;text-align:center}.nc4-footer strong{color:white;font-size:17px}.nc4-footer p{margin:5px 0 0;font-size:12px}.nc4-home-hero{display:flex;align-items:center;justify-content:space-between;gap:30px;padding:34px 38px;border-radius:16px;color:white;background:linear-gradient(125deg,#123150,#0e7490 58%,#2563eb);box-shadow:0 16px 36px rgba(20,73,112,.18)}.nc4-home-hero h1{margin:5px 0 8px;font-size:30px}.nc4-home-hero p:last-child{margin:0;color:#d9ebf5}.nc4-home-stat{flex:0 0 180px;padding:20px;border:1px solid rgba(255,255,255,.24);border-radius:14px;background:rgba(255,255,255,.1);text-align:center}.nc4-home-stat strong{display:block;font-size:32px;line-height:1.2}.nc4-home-stat span{font-size:12px;color:#d9ebf5}.nc4-home-section{margin-top:22px;padding:24px;border:1px solid var(--nc4-line);border-radius:14px;background:white}.nc4-home-section>header{display:flex;align-items:center;justify-content:space-between;margin-bottom:17px}.nc4-home-section>header div{display:flex;align-items:center;gap:9px}.nc4-home-section>header span{padding:2px 7px;border-radius:5px;color:white;background:var(--nc4-primary);font-size:10px;font-weight:800}.nc4-home-section>header h2{margin:0;font-size:21px}.nc4-home-section>header>a{color:var(--nc4-muted);text-decoration:none;font-size:13px}.nc4-home-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-gap:12px;gap:12px}.nc4-home-grid>a{display:flex;align-items:center;gap:11px;min-width:0;padding:13px;border:1px solid var(--nc4-line);border-radius:10px;text-decoration:none}.nc4-home-grid .nc4-app-icon{width:44px;height:44px;border-radius:11px;box-shadow:none}.nc4-home-grid .nc4-app-icon span{font-size:18px}.nc4-home-grid>a>span{min-width:0}.nc4-home-grid small,.nc4-home-grid strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nc4-home-grid strong{font-size:14px}.nc4-home-grid small{color:#929daf;font-size:11px}.nc4-home-list>div{display:grid;grid-template-columns:1fr 1fr;grid-gap:0 24px;gap:0 24px}.nc4-home-list>div a{display:grid;grid-template-columns:24px 1fr auto;grid-gap:8px;gap:8px;padding:10px 0;border-bottom:1px dashed var(--nc4-line);text-decoration:none;font-size:14px}.nc4-home-list b{color:var(--nc4-primary)}.nc4-home-list small{color:#99a3b2}.nc4-gate{position:fixed;inset:0;display:grid;place-items:center;z-index:9998;background:linear-gradient(145deg,#eef6fa,#f8fafc)}.nc4-gate-panel{width:min(360px,calc(100vw - 36px));padding:26px;border:1px solid #d8e6ed;border-radius:16px;background:rgba(255,255,255,.92);text-align:center;box-shadow:0 18px 45px rgba(29,73,94,.12)}.nc4-gate-bar{width:156px;height:5px;margin:0 auto 18px;overflow:hidden;border-radius:99px;background:#dce8ee}.nc4-gate-bar-fill{display:block;width:44%;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--nc4-primary),#38bdf8);animation:nc4-progress 1.05s ease-in-out infinite alternate}.nc4-gate-hint{margin:0;color:#143b4e;font-size:17px;font-weight:700}.nc4-gate-sub{margin:7px 0 0;color:#748696;font-size:13px}.nc4-gate-retry{margin-top:15px;padding:8px 18px;border:0;border-radius:8px;color:white;background:var(--nc4-primary);cursor:pointer}.nc4-gate-frame{background:white}@keyframes nc4-progress{0%{transform:translateX(-85px)}to{transform:translateX(125px)}}@media (max-width:900px){.nc4-columns{grid-template-columns:1fr}.nc4-sidebar{grid-template-columns:1fr 1fr}.nc4-hero{grid-template-columns:88px minmax(0,1fr)}.nc4-action{grid-column:1/-1;width:100%}.nc4-home-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (max-width:680px){.nc4-wrap{width:min(100% - 24px,1160px)}.nc4-search,.nc4-topline-inner span:last-child{display:none}.nc4-header-inner{min-height:74px}.nc4-brand strong{font-size:20px}.nc4-nav-inner{gap:24px;overflow-x:auto}.nc4-nav a{flex:0 0 auto;font-size:14px}.nc4-content{padding:20px 16px}.nc4-hero{grid-template-columns:66px minmax(0,1fr);align-items:start;gap:13px}.nc4-app-icon{width:58px;height:58px;border-radius:15px}.nc4-app-icon span{font-size:24px}.nc4-hero h1{font-size:21px}.nc4-lead{grid-column:1/-1}.nc4-meta-grid{grid-template-columns:1fr 1fr}.nc4-prevnext,.nc4-related-grid,.nc4-sidebar{grid-template-columns:1fr}.nc4-prevnext a:last-child{text-align:left}.nc4-home-hero{align-items:flex-start;padding:25px 22px}.nc4-home-hero h1{font-size:24px}.nc4-home-stat{display:none}.nc4-home-grid{grid-template-columns:1fr 1fr}.nc4-home-list>div{grid-template-columns:1fr}}