*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;min-width:0;background:#F4FBFF;color:#223044;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.82;overflow-x:hidden}
body.drawer-open{overflow:hidden}
a{color:#0877C9;text-decoration:none}
a:hover{text-decoration:none}
img,svg,video,canvas{max-width:100%}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.site-header{position:sticky;top:0;z-index:9999;width:100%;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);box-shadow:0 8px 24px rgba(8,119,201,.08)}
.header-inner{max-width:1180px;min-height:70px;margin:0 auto;padding:0 18px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.site-logo{display:flex;align-items:center;flex:0 0 auto;min-width:150px}
.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain}
.logo-placeholder{display:inline-flex;align-items:center;justify-content:center;width:168px;height:40px;border-radius:10px;background:#EAF7FF;color:#0877C9;font-weight:800;letter-spacing:.04em}
.nav-core{display:flex;align-items:center;justify-content:center;gap:2px;min-width:0;white-space:nowrap}
.nav-core a{color:#1D2A3A;padding:8px 11px;font-weight:700;text-decoration:none;white-space:nowrap;border-bottom:2px solid transparent}
.nav-core a.is-current,.nav-core a:hover{color:#0877C9;border-bottom:2px solid #1CA8F6}
.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:#FFFFFF;border-radius:999px;text-decoration:none;font-weight:700;box-shadow:0 12px 26px rgba(8,119,201,.18);white-space:nowrap}
.header-action{flex:0 0 auto}
.menu-toggle{display:none;width:42px;height:42px;padding:10px;border:1px solid rgba(28,168,246,.18);border-radius:12px;background:#fff}
.menu-toggle span{display:block;height:2px;background:#0877C9;margin:5px 0;border-radius:999px}
.channel-bar{background:#EAF7FF;border-top:1px solid rgba(28,168,246,.08)}
.channel-track{max-width:1180px;margin:0 auto;padding:0 18px;display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.channel-track::-webkit-scrollbar{display:none}
.channel-track a{flex:0 0 auto;color:#5F7082;font-size:14px;font-weight:700;padding:10px 9px;white-space:nowrap}
.channel-track a:hover,.channel-track a.is-current{color:#0877C9}
.mobile-drawer,.drawer-mask{display:none}
.site-main{min-height:60vh;padding-bottom:10px}
.container{width:min(1180px,calc(100% - 36px));margin:0 auto}
.article-width{width:min(840px,100%);margin-left:auto;margin-right:auto}
.section{padding:52px 0}
.section-tight{padding:34px 0}
.page-hero{padding:50px 0 22px}
.page-hero .hero-box{background:#fff;border:1px solid rgba(28,168,246,.12);border-radius:16px;padding:34px;box-shadow:0 16px 40px rgba(8,119,201,.08)}
.eyebrow{display:inline-block;margin-bottom:8px;color:#0877C9;font-size:13px;font-weight:800;letter-spacing:.08em}
h1,h2,h3{margin-top:0;color:#0877C9;line-height:1.28}
h1{font-size:clamp(34px,4.3vw,46px);margin-bottom:15px;letter-spacing:-.02em}
h2{font-size:26px;margin-bottom:14px}
h3{font-size:19px;margin-bottom:8px}
p{margin:0 0 16px}
.lead{font-size:18px;line-height:1.9;color:#35475A;max-width:820px}
.muted{color:#6F8193}
.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,#EAF7FF,#DDF3FF)}
.media.compact{height:166px;aspect-ratio:auto}
.media.feature{height:228px;aspect-ratio:auto}
.text-card,.info-card,.note-card,.step-card,.question-card{background:#fff;border:1px solid rgba(28,168,246,.12);border-radius:16px;box-shadow:0 16px 40px rgba(8,119,201,.06)}
.text-card,.info-card,.note-card{padding:24px}
.link-card{display:block;background:#fff;border:1px solid rgba(28,168,246,.12);border-radius:15px;padding:20px;color:#223044;box-shadow:0 12px 28px rgba(8,119,201,.06)}
.link-card strong{display:block;color:#0877C9;margin-bottom:6px}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.split{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:26px;align-items:start}
.split.reverse{grid-template-columns:minmax(0,.86fr) minmax(0,1.14fr)}
.stack{display:grid;gap:16px}
.reading{background:#fff;border-radius:16px;border:1px solid rgba(28,168,246,.12);padding:30px;box-shadow:0 16px 40px rgba(8,119,201,.06)}
.reading ul,.reading ol{padding-left:22px;margin:12px 0 18px}
.reading li{margin:8px 0}
.inline-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.inline-links a{padding:8px 12px;border-radius:999px;background:#EAF7FF;color:#0877C9;font-weight:700}
.pill-strip{display:flex;gap:10px;overflow-x:auto;padding:4px 2px 10px;scrollbar-width:none}
.pill-strip::-webkit-scrollbar{display:none}
.pill-strip a{flex:0 0 auto;padding:9px 14px;border-radius:999px;background:#fff;border:1px solid rgba(28,168,246,.18);color:#0877C9;font-weight:700;white-space:nowrap}
.topic-index{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.topic-index a{background:#fff;border:1px solid rgba(28,168,246,.12);border-radius:14px;padding:16px;font-weight:700}
.step-list{display:grid;gap:14px;counter-reset:steps}
.step-card{position:relative;padding:22px 22px 22px 72px;counter-increment:steps}
.step-card:before{content:counter(steps);position:absolute;left:22px;top:20px;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:#EAF7FF;color:#0877C9;font-weight:800}
.breadcrumbs{color:#7A8A9A;font-size:14px;margin-bottom:10px}
.breadcrumbs a{color:#5F7082}
.notice-band{background:#EAF7FF;border:1px solid rgba(28,168,246,.12);border-radius:14px;padding:18px 20px;color:#465A6E}
.simple-list{display:grid;gap:12px}
.simple-list a{display:flex;justify-content:space-between;gap:12px;padding:14px 16px;background:#fff;border-bottom:1px solid rgba(28,168,246,.10);color:#223044}
.simple-list a strong{color:#0877C9}
.question-grid{display:grid;gap:18px}
.question-card{padding:24px}
.question-card h2{font-size:20px}
.question-card p:last-child{margin-bottom:0}
.related-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.related-row a{background:#EAF7FF;border-radius:14px;padding:16px;font-weight:700}

/* homepage */
.home-carousel{position:relative;width:min(1180px,calc(100% - 36px));margin:30px auto 0;background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 16px 40px rgba(8,119,201,.08);height:330px}
.carousel-slide{position:absolute;inset:0;opacity:0;transition:opacity .35s ease;pointer-events:none}
.carousel-slide.is-active{opacity:1;pointer-events:auto}
.carousel-slide .media{height:100%;aspect-ratio:auto;border-radius:0;background:#fff}
.carousel-control{position:absolute;top:50%;transform:translateY(-50%);z-index:3;width:42px;height:42px;border:0;border-radius:50%;background:rgba(255,255,255,.92);color:#0877C9;font-size:28px;line-height:1;box-shadow:0 8px 22px rgba(8,119,201,.12)}
.carousel-prev{left:14px}.carousel-next{right:14px}
.carousel-dots{position:absolute;left:50%;bottom:12px;transform:translateX(-50%);z-index:3;display:flex;gap:8px}
.carousel-dot{width:10px;height:10px;border:0;border-radius:50%;padding:0;background:#B7DFF5}
.carousel-dot.is-active{background:#0877C9}
.magazine{display:grid;grid-template-columns:minmax(0,58fr) minmax(0,42fr);gap:24px;align-items:stretch}
.magazine-main{background:#fff;border-radius:16px;padding:24px;border:1px solid rgba(28,168,246,.12);box-shadow:0 16px 40px rgba(8,119,201,.06)}
.magazine-main .media{height:238px;aspect-ratio:auto;margin-bottom:18px}
.magazine-side{display:grid;gap:14px}
.boundary-copy{width:min(820px,100%);margin:0 auto;background:#fff;border-radius:16px;padding:28px;border:1px solid rgba(28,168,246,.12);box-shadow:0 16px 40px rgba(8,119,201,.05)}

.site-footer{margin-top:44px;background:#082A46;color:#EAF8FF;padding:46px 18px 22px}
.footer-grid{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1.45fr repeat(3,1fr);gap:30px}
.site-footer h2{font-size:17px;color:#fff;margin-bottom:12px}
.site-footer a{display:block;color:#EAF8FF;margin:7px 0}
.footer-brand p{color:#C8E3F2;max-width:340px;font-size:14px}
.footer-logo{display:inline-flex;margin-bottom:14px}
.footer-logo img{height:42px;width:auto;max-width:168px;object-fit:contain}
.footer-service-links{max-width:1180px;margin:24px auto 0;padding-top:18px;border-top:1px solid rgba(234,248,255,.16);display:flex;flex-wrap:wrap;gap:18px}
.footer-service-links a{margin:0}
.footer-bottom{max-width:1180px;margin:18px auto 0;padding-top:18px;border-top:1px solid rgba(234,248,255,.12);color:#C8E3F2;font-size:13px;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.side-float{position:fixed;right:12px;top:45%;transform:translateY(-50%);z-index:9500;width:86px;background:#fff;border:1px solid rgba(28,168,246,.14);border-radius:16px;padding:8px;box-shadow:0 16px 36px rgba(8,119,201,.11)}
.side-float a,.side-float button{display:flex;align-items:center;justify-content:center;width:100%;min-height:38px;padding:7px 4px;margin:3px 0;border:0;border-radius:10px;background:#fff;color:#0877C9;font-size:12px;font-weight:700;text-align:center}
.side-float .side-main{background:linear-gradient(135deg,#38C7FF 0%,#1CA8F6 48%,#0877C9 100%);color:#fff}
.mobile-bottom{display:none}

@media(max-width:1080px){.side-float{display:none}.nav-core a{padding:8px 7px}.site-logo{min-width:138px}}
@media(max-width:980px){
  .channel-bar,.nav-core{display:none}
  .header-inner{display:grid;grid-template-columns:46px 1fr auto;min-height:64px;gap:10px;padding:0 14px}
  .menu-toggle{display:block}
  .site-logo{justify-content:center;min-width:0}
  .site-logo img{height:36px;max-width:152px}
  .header-action{height:40px;min-width:86px;padding:0 15px;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(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}
  .drawer-head{height:64px;padding:0 14px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #EAF7FF}
  .drawer-logo{display:flex;align-items:center}.drawer-logo img{height:34px;width:auto;max-width:146px;object-fit:contain}
  .drawer-close{width:40px;height:40px;border:0;border-radius:12px;background:#EAF7FF;color:#0877C9;font-size:26px;line-height:1}
  .drawer-scroll{height:calc(100vh - 64px);overflow-y:auto;padding:12px 16px 34px}
  .drawer-scroll section{padding:10px 0 12px;border-bottom:1px solid #EDF7FC}
  .drawer-scroll h2{font-size:13px;color:#7A8A9A;margin:0 0 7px;text-transform:none}
  .drawer-scroll a{display:block;padding:9px 8px;border-radius:9px;color:#1D2A3A;font-weight:700}
  .drawer-scroll a:hover{background:#EAF7FF;color:#0877C9}
  .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 rgba(28,168,246,.12);box-shadow:0 -8px 24px rgba(8,119,201,.08);padding-bottom:env(safe-area-inset-bottom)}
  .mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:54px;color:#35506A;font-size:13px;font-weight:700}
  .site-main{padding-bottom:62px}
  .site-footer{padding-bottom:82px}
  .split,.split.reverse,.magazine{grid-template-columns:1fr}
  .grid-4,.related-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .topic-index{grid-template-columns:repeat(2,minmax(0,1fr))}
  .home-carousel{height:260px}
}
@media(max-width:720px){
  .container,.home-carousel{width:min(100% - 24px,1180px)}
  .section{padding:36px 0}.section-tight{padding:26px 0}.page-hero{padding:30px 0 14px}
  .page-hero .hero-box{padding:24px 20px}
  h1{font-size:clamp(26px,8.2vw,32px)}h2{font-size:23px}.lead{font-size:16.5px}
  .grid-2,.grid-3,.grid-4,.related-row,.topic-index{grid-template-columns:1fr}
  .reading{padding:22px 19px}.text-card,.info-card,.note-card{padding:20px}
  .media.compact{height:156px}.media.feature,.magazine-main .media{height:210px}
  .home-carousel{height:182px;margin-top:18px;border-radius:14px}
  .carousel-control{width:38px;height:38px;font-size:24px}.carousel-prev{left:8px}.carousel-next{right:8px}
  .magazine-main{padding:18px}.boundary-copy{padding:22px 19px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
}
@media(max-width:430px){
  .header-inner{grid-template-columns:42px minmax(0,1fr) auto;padding:0 10px;gap:7px}
  .menu-toggle{width:40px;height:40px}
  .site-logo img{height:32px;max-width:128px}
  .logo-placeholder{width:128px;height:32px;font-size:13px}
  .header-action{min-width:78px;height:38px;padding:0 12px;font-size:13px}
  .footer-grid{grid-template-columns:1fr}
}