:root{--bg:#F4FBFF;--card:#FFFFFF;--soft:#EAF7FF;--blue:#1CA8F6;--bright:#38C7FF;--deep:#0877C9;--ink:#223044;--muted:#5F7082;--foot:#082A46;--line:rgba(28,168,246,.14);--shadow:0 16px 40px rgba(8,119,201,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8;overflow-x:hidden}a{color:inherit}img{max-width:100%}button,input{font:inherit}.site-header{position:sticky;top:0;z-index:9999;width:100%;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);box-shadow:0 8px 24px rgba(8,119,201,.08)}.header-inner{max-width:1180px;min-height:72px;margin:0 auto;padding:0 18px;display:flex;align-items:center;justify-content:space-between;gap:16px}.site-logo{display:inline-flex;align-items:center;min-width:150px;text-decoration:none}.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain}.logo-placeholder{display:block;width:156px;height:40px;border-radius:10px;background:linear-gradient(135deg,#dff4ff,#edf9ff);border:1px solid var(--line)}.nav-core{display:flex;align-items:center;gap:2px;white-space:nowrap}.nav-core a{color:#1D2A3A;padding:9px 12px;font-weight:700;text-decoration:none;border-radius:10px}.nav-core a.is-current,.nav-core a:hover{color:var(--deep);background:var(--soft)}.main-btn{display:inline-flex;align-items:center;justify-content:center;height:42px;min-width:96px;padding:0 20px;background:linear-gradient(135deg,#38C7FF 0%,#1CA8F6 48%,#0877C9 100%);color:#fff;border-radius:999px;text-decoration:none;font-weight:700;box-shadow:0 12px 26px rgba(8,119,201,.18);white-space:nowrap}.menu-toggle{display:none;width:42px;height:42px;border:0;background:var(--soft);border-radius:12px;padding:10px;cursor:pointer}.menu-toggle span{display:block;height:2px;background:var(--deep);margin:4px 0;border-radius:10px}.channel-bar{background:#EAF7FF;border-top:1px solid rgba(28,168,246,.08)}.channel-inner{max-width:1180px;margin:0 auto;padding:0 18px;display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}.channel-inner::-webkit-scrollbar{display:none}.channel-inner a{flex:0 0 auto;padding:10px 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solid var(--line);border-radius:16px;box-shadow:var(--shadow)}.card{padding:24px}.soft-card{padding:22px;background:#f9fdff}.reading-card{padding:28px}.card p:last-child,.soft-card p:last-child,.reading-card p:last-child{margin-bottom:0}.text-link{color:var(--deep);font-weight:800;text-decoration:none}.text-link:hover{text-decoration:underline}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.asym{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);gap:22px;align-items:start}.stack{display:grid;gap:16px}.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:14px;background:#EAF7FF;aspect-ratio:16/9}.media>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center center;display:block}.media-placeholder{position:absolute;inset:0;display:block;background:linear-gradient(135deg,#e6f7ff 0%,#d9f1ff 100%)}.feature-media{margin-bottom:22px}.topic-media{height:230px;aspect-ratio:auto;margin-bottom:20px}.hero-zone{padding:30px 0 0}.hero-carousel{width:min(1180px,calc(100% - 36px));margin:0 auto}.hero-frame{position:relative;height:330px;border-radius:18px;overflow:hidden;background:#fff;box-shadow:var(--shadow);border:1px solid var(--line)}.hero-slide{position:absolute;inset:0;opacity:0;pointer-events:none;transition:opacity .35s ease;display:flex;align-items:center;justify-content:center}.hero-slide.is-active{opacity:1;pointer-events:auto}.hero-slide img{width:100%;height:100%;object-fit:contain;display:block}.hero-arrow{position:absolute;top:50%;transform:translateY(-50%);width:42px;height:42px;border:1px solid rgba(28,168,246,.3);background:rgba(255,255,255,.9);color:var(--deep);border-radius:50%;font-size:26px;cursor:pointer;z-index:2}.hero-prev{left:14px}.hero-next{right:14px}.hero-dots{position:absolute;left:0;right:0;bottom:14px;display:flex;justify-content:center;gap:8px;z-index:2}.hero-dot{width:9px;height:9px;padding:0;border:0;border-radius:99px;background:#bfdff1;cursor:pointer}.hero-dot.is-active{width:26px;background:var(--blue)}.home-heading{padding:50px 0 26px}.home-heading-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);gap:24px;align-items:end}.home-kicker{font-size:14px;font-weight:800;color:var(--blue);letter-spacing:.08em}.home-heading p{margin:0;color:var(--muted);font-size:17px}.route-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.route-step{padding:20px;position:relative}.route-step 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a{display:grid;grid-template-columns:44px 1fr;align-items:center;gap:12px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:14px;text-decoration:none}.chapter-list b{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--soft);color:var(--deep)}.article{font-size:17px}.article p{margin:0 0 18px}.article h2{margin-top:34px}.article ul{padding-left:22px}.article li{margin-bottom:8px}.split-band{display:grid;grid-template-columns:1fr 1fr;gap:0;border-radius:18px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}.split-band>div{padding:28px;background:#fff}.split-band>div+div{background:#eff9ff}.steps{display:grid;counter-reset:item;gap:14px}.steps .step{position:relative;padding:18px 18px 18px 62px;background:#fff;border:1px solid var(--line);border-radius:14px}.steps .step::before{counter-increment:item;content:counter(item);position:absolute;left:18px;top:18px;width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--soft);color:var(--deep);font-weight:800}.related{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.related a{display:block;padding:16px;background:#fff;border:1px solid var(--line);border-radius:14px;text-decoration:none;font-weight:800;color:#2e4b65}.mini-index{display:flex;gap:10px;flex-wrap:wrap}.mini-index a{padding:8px 12px;border-radius:999px;background:var(--soft);color:var(--deep);text-decoration:none;font-weight:800;font-size:14px}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.faq-item h2{font-size:20px;margin-bottom:10px}.notice-band{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:var(--shadow)}.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.tag-row span{background:var(--soft);color:var(--deep);padding:6px 10px;border-radius:999px;font-size:13px;font-weight:800}.site-footer{background:var(--foot);color:#EAF8FF;margin-top:40px}.footer-grid{max-width:1180px;margin:0 auto;padding:46px 18px 34px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}.footer-grid h2{font-size:16px;color:#fff;margin-bottom:12px}.footer-grid a{display:block;color:#d8eefb;text-decoration:none;margin:6px 0}.footer-grid a:hover{color:#fff}.footer-brand p{color:#cbe6f5;max-width:320px}.footer-logo{margin-bottom:14px}.footer-bottom{max-width:1180px;margin:0 auto;padding:18px;border-top:1px solid rgba(234,248,255,.14);color:#bcd9ea;font-size:14px}.side-float{position:fixed;right:14px;top:50%;transform:translateY(-50%);z-index:8000;width:92px;display:grid;gap:8px}.side-float a,.side-float button{background:#fff;color:var(--deep);border:1px solid var(--line);border-radius:12px;padding:10px 8px;text-align:center;text-decoration:none;font-size:13px;font-weight:800;box-shadow:0 8px 24px rgba(8,119,201,.1)}.side-float .float-main{background:linear-gradient(135deg,#38C7FF,#0877C9);color:#fff}.back-top{cursor:pointer}.mobile-bottom{display:none}.mobile-drawer,.drawer-mask{display:none}body.drawer-open{overflow:hidden}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--line)}.drawer-close{width:40px;height:40px;border:0;background:var(--soft);color:var(--deep);border-radius:12px;font-size:28px;line-height:1;cursor:pointer}.drawer-scroll{height:calc(100vh - 74px);overflow-y:auto;padding:14px 16px 26px}.drawer-group{display:grid;gap:2px;margin-bottom:18px}.drawer-group strong{color:var(--deep);font-size:13px;letter-spacing:.08em;padding:7px 10px}.drawer-group a{text-decoration:none;padding:10px;border-radius:10px;color:#2d4054;font-weight:700}.drawer-group a:hover{background:var(--soft)}
@media(max-width:1100px){.nav-core a{padding:8px 8px}.side-float{display:none}.asym{grid-template-columns:1fr}.footer-grid{grid-template-columns:1.25fr 1fr 1fr}.footer-grid>div:last-child{grid-column:2/4}}
@media(max-width:980px){.channel-bar,.nav-core{display:none}.menu-toggle{display:block}.header-inner{min-height:64px;padding:0 14px}.header-action{height:40px;min-width:82px;padding:0 14px}.site-logo{min-width:0;justify-content:center}.site-logo img{height:36px;max-width:146px}.site-main{padding-bottom:76px}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(84vw,320px);background:#fff;z-index:12000;transform:translateX(-105%);transition:transform .2s ease;box-shadow:18px 0 40px rgba(8,119,201,.16)}.mobile-drawer.is-open{transform:translateX(0)}.drawer-mask{display:none;position:fixed;inset:0;background:rgba(8,42,70,.42);z-index:11000;opacity:0;pointer-events:none;transition:opacity .18s ease}.drawer-mask.is-visible{display:block;opacity:1;pointer-events:auto}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:9000;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{text-align:center;padding:12px 6px;color:#355064;text-decoration:none;font-weight:800;font-size:13px}.mobile-bottom a:hover{color:var(--deep)}.hero-frame{height:250px}.home-heading-grid,.grid-3,.grid-4,.route-strip,.related,.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:last-child{grid-column:auto}.grid-2,.split-band{grid-template-columns:1fr}}
@media(max-width:640px){.wrap,.narrow,.hero-carousel{width:min(100% - 26px,1180px)}.section{padding:38px 0}.section.tight{padding:26px 0}.page-intro{padding:38px 0 16px}h1{font-size:30px}h2{font-size:23px}.lead{font-size:17px}.hero-zone{padding-top:18px}.hero-frame{height:180px;border-radius:14px}.hero-arrow{width:36px;height:36px;font-size:22px}.home-heading{padding:34px 0 18px}.home-heading-grid,.grid-3,.grid-4,.route-strip,.related,.footer-grid{grid-template-columns:1fr}.card,.reading-card{padding:20px}.footer-grid{padding-top:36px}.footer-brand p{max-width:none}.article{font-size:16px}.split-band>div{padding:22px}.header-inner{gap:8px}.header-action{font-size:14px}.logo-placeholder{width:132px;height:36px}.topic-cloud{margin-right:-13px;padding-right:13px}}