*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#EAF2FB;color:#20344E;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.82;overflow-x:hidden}a{color:#126FCC}img{max-width:100%}button,a{touch-action:manipulation}.site-header{position:sticky;top:0;z-index:9000;width:100%;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);box-shadow:0 5px 20px rgba(28,94,155,.08)}.header-inner{max-width:1180px;min-height:68px;margin:0 auto;padding:0 16px;display:flex;align-items:center;gap:16px}.site-logo{display:flex;align-items:center;min-width:132px;text-decoration:none}.site-logo img{display:block;height:38px;width:auto;max-width:156px;object-fit:contain}.logo-placeholder{display:inline-flex;align-items:center;justify-content:center;min-width:124px;height:38px;padding:0 12px;border-radius:10px;background:#EAF4FF;color:#126FCC;font-weight:800}.logo-placeholder.dark{background:rgba(255,255,255,.09);color:#EAF6FF}.nav-core{flex:1;display:flex;align-items:center;justify-content:center;gap:2px;white-space:nowrap}.nav-core a{color:#20344E;padding:8px 10px;font-weight:700;text-decoration:none;white-space:nowrap;border-radius:8px}.nav-core a.is-current,.nav-core a:hover{color:#126FCC;background:#EFF7FF}.header-actions{display:flex;align-items:center;gap:8px;white-space:nowrap}.auth-btn{display:inline-flex;align-items:center;justify-content:center;height:40px;min-width:68px;padding:0 16px;border-radius:999px;text-decoration:none;font-weight:800}.auth-btn.register{background:linear-gradient(135deg,#4BC8FF 0%,#2E9FF2 48%,#126FCC 100%);color:#fff;box-shadow:0 8px 18px rgba(18,111,204,.18)}.auth-btn.login{background:#EEF7FF;color:#126FCC;border:1px solid rgba(18,111,204,.18)}.main-btn{display:inline-flex;align-items:center;justify-content:center;height:40px;min-width:92px;padding:0 18px;background:linear-gradient(135deg,#4BC8FF 0%,#2E9FF2 48%,#126FCC 100%);color:#fff;border-radius:999px;text-decoration:none;font-weight:800;box-shadow:0 8px 18px rgba(18,111,204,.18)}.menu-toggle{display:none}.channel-strip{background:#F6FAFF;border-top:1px solid rgba(46,159,242,.1);overflow:hidden}.channel-inner{max-width:1180px;margin:0 auto;padding:0 16px;display:flex;overflow-x:auto;scrollbar-width:none}.channel-inner::-webkit-scrollbar{display:none}.channel-inner a{flex:0 0 auto;padding:10px 11px;color:#667B94;text-decoration:none;font-size:14px;white-space:nowrap}.channel-inner a:hover{color:#126FCC}.site-main{max-width:100%;padding-bottom:40px}.container{width:min(1180px,calc(100% - 32px));margin:0 auto}.narrow{width:min(820px,calc(100% - 32px));margin:0 auto}.section{padding:46px 0}.section-tight{padding:28px 0}.page-head{padding:42px 0 18px;background:linear-gradient(180deg,#F4F9FF 0%,#EAF2FB 100%)}.page-head h1,.hero-copy h1{font-size:clamp(28px,4vw,42px);line-height:1.22;margin:0 0 14px;color:#126FCC}.page-head p,.hero-copy p{font-size:17px;margin:0;color:#405671}.breadcrumb{font-size:14px;color:#7489A0;margin-bottom:12px}.breadcrumb a{text-decoration:none}.hero-copy{padding:40px 0 16px}.panel,.content-card,.note-strip,.link-tile,.faq-item{background:#fff;border:1px solid rgba(46,159,242,.14);border-radius:16px;box-shadow:0 12px 28px rgba(28,94,155,.09)}.panel,.content-card{padding:24px}.content-card h2,.panel h2,.text-block h2{color:#126FCC;line-height:1.35;margin:0 0 12px;font-size:23px}.content-card p,.text-block p{margin:0 0 14px}.note-strip{padding:21px 24px;background:#F5FAFF}.grid-2,.grid-3,.grid-6{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-6{grid-template-columns:repeat(3,minmax(0,1fr))}.link-tile{display:block;padding:20px;text-decoration:none;color:#20344E}.link-tile strong{display:block;color:#126FCC;font-size:18px;margin-bottom:4px}.link-tile span{color:#667B94}.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:14px;background:#EDF5FF;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;background:linear-gradient(135deg,#EAF4FF,#F6FAFF)}.split{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:center}.feature-band{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;align-items:stretch}.feature-band .content-card{display:flex;flex-direction:column;justify-content:center}.app-strip{display:grid;grid-template-columns:220px 1fr auto;gap:22px;align-items:center;background:#fff;padding:18px;border-radius:16px;border:1px solid rgba(46,159,242,.14);box-shadow:0 12px 28px rgba(28,94,155,.09)}.app-strip .media{height:126px;aspect-ratio:auto}.slider-wrap{padding:26px 0 6px}.slider{position:relative;z-index:1;overflow:hidden;border-radius:18px;background:#fff;box-shadow:0 14px 30px rgba(28,94,155,.12);height:300px}.slide{display:none;position:absolute;inset:0}.slide.is-active{display:block}.slide .media{height:100%;aspect-ratio:auto;border-radius:18px}.slider-prev,.slider-next{position:absolute;z-index:2;top:50%;transform:translateY(-50%);width:42px;height:42px;border:0;border-radius:50%;background:rgba(255,255,255,.94);color:#126FCC;font-size:24px;cursor:pointer}.slider-prev{left:14px}.slider-next{right:14px}.slider-dots{position:absolute;z-index:2;left:0;right:0;bottom:12px;display:flex;justify-content:center;gap:8px}.slider-dot{width:10px;height:10px;border-radius:50%;border:0;background:rgba(18,111,204,.28);padding:0;cursor:pointer}.slider-dot.is-active{background:#126FCC}.article-flow{display:grid;gap:22px}.article-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.article-links a{display:inline-flex;padding:8px 12px;border-radius:999px;background:#EEF7FF;text-decoration:none}.steps{counter-reset:step;display:grid;gap:14px}.step{position:relative;padding:18px 18px 18px 62px;background:#fff;border:1px solid rgba(46,159,242,.14);border-radius:14px}.step:before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:18px;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#126FCC;color:#fff;font-weight:700}.faq-list{display:grid;gap:16px}.faq-item{padding:22px}.faq-item h2{font-size:20px;color:#126FCC;margin:0 0 8px}.topic-index{display:flex;flex-wrap:wrap;gap:10px}.topic-index a{padding:9px 13px;border-radius:10px;background:#fff;text-decoration:none;border:1px solid rgba(46,159,242,.14)}.floating-tools{position:fixed;z-index:8000;right:10px;top:34%;width:112px;display:grid;gap:8px;padding:8px;background:rgba(255,255,255,.97);border:1px solid rgba(46,159,242,.14);border-radius:14px;box-shadow:0 12px 26px rgba(28,94,155,.12)}.floating-tools a,.floating-tools button{min-height:40px;border:0;border-radius:10px;background:#fff;color:#126FCC;text-align:center;text-decoration:none;font:inherit;padding:7px 5px;cursor:pointer}.floating-tools .main-btn{color:#fff;border-radius:999px;min-width:0;height:40px}.floating-tools .login-small{background:#EEF7FF}.site-footer{background:#102B46;color:#EAF6FF;padding:44px 0 84px}.footer-grid{width:min(1180px,calc(100% - 32px));margin:0 auto;display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:28px}.site-footer h2{font-size:17px;margin:0 0 10px;color:#fff}.site-footer a{display:block;color:#EAF6FF;text-decoration:none;margin:5px 0}.footer-brand p{margin:12px 0 0;color:#CFE5F7}.footer-logo img{height:38px;width:auto;max-width:156px;object-fit:contain}.footer-bottom{width:min(1180px,calc(100% - 32px));margin:28px auto 0;padding-top:20px;border-top:1px solid rgba(234,246,255,.14);font-size:14px;color:#CFE5F7}.mobile-bottom{display:none}.mobile-drawer,.drawer-mask{display:none}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid rgba(46,159,242,.14)}.drawer-logo img{height:34px;width:auto;max-width:145px;object-fit:contain}.drawer-close,.menu-toggle{min-height:40px;border:0;background:#EEF7FF;color:#126FCC;border-radius:10px;padding:0 12px;font-weight:800}.drawer-auth{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:12px 16px 2px}.drawer-auth .auth-btn{width:100%}.drawer-nav{padding:10px 16px 28px;overflow-y:auto;height:calc(100vh - 132px)}.drawer-group{padding:10px 0;border-bottom:1px solid rgba(46,159,242,.12)}.drawer-group strong{display:block;color:#126FCC;margin-bottom:5px}.drawer-group a{display:block;padding:7px 2px;text-decoration:none;color:#20344E}
@media(max-width:1180px){.floating-tools{display:none}.site-main{padding-right:0}.nav-core a{padding:8px 7px}}
@media(max-width:980px){.header-inner{min-height:62px;display:grid;grid-template-columns:auto 1fr auto;gap:8px}.menu-toggle{display:inline-flex;align-items:center;justify-content:center;justify-self:start}.site-logo{justify-self:center;min-width:0}.site-logo img{height:33px;max-width:120px}.nav-core,.channel-strip{display:none}.header-actions{justify-self:end;gap:5px}.auth-btn{height:38px;min-width:54px;padding:0 11px;font-size:14px}.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(16,43,70,.16)}.mobile-drawer.is-open{transform:translateX(0)}.drawer-mask{display:none;position:fixed;inset:0;background:rgba(16,43,70,.38);z-index:11000;opacity:0;pointer-events:none;transition:opacity .18s ease}.drawer-mask.is-visible{display:block;opacity:1;pointer-events:auto}body.drawer-open{overflow:hidden}.split,.feature-band{grid-template-columns:1fr}.app-strip{grid-template-columns:160px 1fr}.app-strip .main-btn{grid-column:1/-1;justify-self:start}.slider{height:230px}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){body{padding-bottom:58px}.header-inner{padding:0 10px}.menu-toggle{min-width:48px;padding:0 8px;font-size:13px}.site-logo img{max-width:100px;height:31px}.auth-btn{min-width:49px;height:36px;padding:0 8px;font-size:13px}.container,.narrow{width:min(100% - 24px,1180px)}.section{padding:30px 0}.section-tight{padding:22px 0}.page-head{padding:28px 0 12px}.hero-copy{padding:30px 0 14px}.grid-2,.grid-3{grid-template-columns:1fr}.grid-6{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.link-tile{padding:16px}.slider{height:165px}.slider-prev,.slider-next{width:38px;height:38px}.app-strip{grid-template-columns:1fr}.app-strip .media{height:auto;aspect-ratio:16/9}.panel,.content-card{padding:20px}.footer-grid{grid-template-columns:1fr 1fr;gap:22px}.footer-brand{grid-column:1/-1}.site-footer{padding-bottom:88px}.mobile-bottom{position:fixed;z-index:8500;left:0;right:0;bottom:0;height:58px;background:#fff;border-top:1px solid rgba(46,159,242,.2);display:grid;grid-template-columns:repeat(4,1fr)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;color:#126FCC;text-decoration:none;font-weight:800}.site-logo .logo-placeholder{min-width:86px;padding:0 6px;font-size:14px}.page-head p,.hero-copy p{font-size:16px}}

/* v4 content presentation */
.hero-copy .narrow{background:linear-gradient(180deg,#fff,#f4f8ff);border:1px solid rgba(47,168,247,.14);border-radius:16px;padding:28px 30px;box-shadow:0 12px 26px rgba(19,124,216,.08)}
.home-ribbon{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;align-items:stretch}
.home-ribbon>div{background:#fff;border:1px solid rgba(47,168,247,.14);border-radius:16px;padding:24px;box-shadow:0 12px 26px rgba(19,124,216,.08)}
.home-ribbon h2{margin-top:0;color:#137CD8}.home-ribbon p{margin-bottom:0}
.category-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.category-chips a{padding:9px 13px;background:#edf5ff;border-radius:999px;text-decoration:none;color:#24364f;font-weight:700}
.category-chips a:hover{color:#137cd8}
@media(max-width:760px){.home-ribbon{grid-template-columns:1fr}.hero-copy .narrow{padding:22px 18px}}