*{box-sizing:border-box}
html{scroll-behavior:smooth;background:#F4F8FD}
body{margin:0;overflow-x:hidden;background:#F4F8FD;color:#243447;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8}
body.drawer-open{overflow:hidden}
img{max-width:100%}
a{color:#1C63E8}
button,input,select{font:inherit}
.site-header{position:sticky;top:0;z-index:9999;width:100%;background:rgba(247,251,255,.96);box-shadow:0 8px 24px rgba(16,48,84,.08);backdrop-filter:blur(14px)}
.header-inner{max-width:1220px;min-height:72px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.site-logo,.drawer-logo,.footer-logo{display:inline-flex;align-items:center;text-decoration:none}
.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain}
.nav-core{display:flex;align-items:center;gap:6px;white-space:nowrap;flex-wrap:nowrap}
.nav-core a{color:#143250;padding:8px 12px;border-radius:999px;font-weight:700;text-decoration:none}
.nav-core a.is-current,.nav-core a:hover{background:#E4F0FF;color:#1C63E8}
.header-actions{display:flex;align-items:center;gap:8px}
.login-btn{height:42px;min-width:88px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;background:#1C63E8;color:#FFFFFF;border-radius:999px;text-decoration:none;font-weight:700;white-space:nowrap}
.register-btn{height:42px;min-width:88px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;background:#FFFFFF;color:#143250;border:1px solid #C3D6F0;border-radius:999px;text-decoration:none;font-weight:700;white-space:nowrap}
.mobile-login,.menu-toggle{display:none}
.logo-placeholder{display:inline-flex;align-items:center;justify-content:center;min-width:132px;height:40px;padding:0 12px;border:1px solid #C3D6F0;border-radius:12px;background:#fff;color:#143250;font-weight:800;letter-spacing:.08em}
.channel-strip{display:block;border-top:1px solid #E7EFF8;background:#fff}
.channel-inner{max-width:1220px;margin:0 auto;padding:0 20px;display:flex;gap:6px;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin;white-space:nowrap}
.channel-inner a{flex:0 0 auto;padding:11px 10px;color:#5B6B7C;text-decoration:none;font-size:14px}
.channel-inner a:hover,.channel-inner a.is-current{color:#1C63E8;font-weight:800}
.site-main{width:100%;overflow:hidden}
.container{width:min(100% - 40px,1220px);margin:0 auto}
.reading{width:min(100% - 40px,860px);margin:0 auto}
.section{padding:76px 0}
.section.compact{padding:54px 0}
.section.alt{background:#EAF3FF}
.hero{padding:72px 0 64px}
.hero-grid,.split{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr);gap:40px;align-items:center}
.eyebrow{margin:0 0 8px;color:#1C63E8;font-size:14px;font-weight:800;letter-spacing:.12em}
h1,h2,h3{margin-top:0;color:#143250;line-height:1.25}
h1{font-size:clamp(40px,4vw,52px);margin-bottom:20px;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,36px);margin-bottom:18px}
h3{font-size:20px;margin-bottom:10px}
.lead{font-size:18px;line-height:1.85;color:#425469;max-width:760px}
.meta-note{color:#7A8896;font-size:14px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.btn-primary,.btn-secondary{min-height:42px;padding:0 22px;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;font-weight:800;text-decoration:none}
.btn-primary{background:#1C63E8;color:#fff}
.btn-primary:hover{background:#154FC0}
.btn-secondary{background:#fff;color:#143250;border:1px solid #C3D6F0}
.text-link{display:inline-flex;align-items:center;gap:6px;color:#1C63E8;text-decoration:none;font-weight:800}
.text-link:after{content:"→"}
.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:18px;background:#EAF3FF;aspect-ratio:16/9;border:1px solid #DCEAFB}
.media>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center center;display:block}
.media-hero{height:290px;aspect-ratio:auto}
.media-split{height:244px;aspect-ratio:auto}
.media-card{height:176px;aspect-ratio:auto}
.media-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:18px;color:#5B6B7C;font-weight:800;text-align:center;background:linear-gradient(135deg,#F7FBFF,#EAF3FF)}
.summary-grid,.grid-3,.feature-grid,.qa-grid,.review-grid,.link-grid{display:grid;gap:22px}
.summary-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.qa-grid,.review-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.link-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.info-card,.topic-card,.qa-item,.review-item,.notice,.step-item,.reading-card{background:#fff;border:1px solid #DCEAFB;border-radius:18px;box-shadow:0 14px 34px rgba(16,48,84,.08)}
.info-card,.qa-item,.review-item,.notice,.step-item,.reading-card{padding:24px}
.info-card p,.topic-card p,.qa-item p,.review-item p,.reading-card p{margin:0;color:#5B6B7C}
.topic-card{overflow:hidden;padding:12px}
.topic-card .topic-body{padding:16px 8px 8px}
.topic-card .media{margin-bottom:14px}
.topic-card.text-only{padding:26px;background:linear-gradient(145deg,#fff,#F2F7FE)}
.topic-matrix{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.quick-scroll{display:flex;gap:10px;overflow-x:auto;padding:4px 0 12px;scrollbar-width:thin}
.quick-scroll a{flex:0 0 auto;background:#fff;border:1px solid #C3D6F0;color:#143250;border-radius:999px;padding:9px 14px;text-decoration:none;font-weight:700}
.dual{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.section-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:28px}
.section-head p{margin:0;max-width:680px;color:#5B6B7C}
.kicker-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.kicker-list li{position:relative;padding-left:22px}
.kicker-list li:before{content:"";position:absolute;left:0;top:.75em;width:8px;height:8px;border-radius:50%;background:#1C63E8}
.step-list{display:grid;gap:16px;counter-reset:steps}
.step-item{position:relative;padding-left:72px}
.step-item:before{counter-increment:steps;content:counter(steps);position:absolute;left:24px;top:24px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#EAF3FF;color:#1C63E8;font-weight:800}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px;font-size:14px;color:#7A8896}
.breadcrumb a{color:#5B6B7C;text-decoration:none}
.article p{margin:0 0 18px}
.article ul,.article ol{padding-left:22px;margin:0 0 22px}
.article li+li{margin-top:8px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.tag-row a{background:#EAF3FF;color:#154FC0;text-decoration:none;padding:7px 12px;border-radius:999px;font-size:14px;font-weight:700}
.note-strip{padding:20px 22px;border-radius:18px;background:#EAF3FF;border:1px solid #DCEAFB;color:#425469}
.notice-list{display:grid;gap:14px}
.notice strong{color:#143250}
.faq-list{display:grid;gap:16px}
.faq-item{background:#fff;border:1px solid #DCEAFB;border-radius:18px;padding:22px}
.faq-item h2,.faq-item h3{font-size:20px;margin-bottom:8px}
.faq-item p{margin:0}
.table-like{display:grid;gap:12px}
.table-row{display:grid;grid-template-columns:180px 1fr;gap:20px;padding:18px 0;border-bottom:1px solid #DCEAFB}
.table-row strong{color:#143250}
.float-tools{position:fixed;right:14px;top:38%;z-index:7000;width:88px;display:grid;gap:8px}
.float-tools a,.float-tools button{border:1px solid #C3D6F0;background:#fff;color:#1C63E8;border-radius:13px;min-height:42px;padding:8px 6px;text-align:center;text-decoration:none;font-size:13px;font-weight:800;box-shadow:0 10px 24px rgba(16,48,84,.08);cursor:pointer}
.float-tools .float-primary{background:#1C63E8;color:#fff;border-color:#1C63E8}
.site-footer{background:#0E2338;color:#D5E6F6;padding:58px 0 96px}
.footer-inner{width:min(100% - 40px,1220px);margin:0 auto;display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:32px}
.footer-inner h2{color:#fff;font-size:18px;margin-bottom:14px}
.footer-inner a{display:block;color:#D5E6F6;text-decoration:none;margin:7px 0}
.footer-brand p{max-width:360px}
.footer-logo img{height:40px;width:auto;max-width:168px;object-fit:contain;filter:brightness(0) invert(1)}
.footer-mark{background:transparent;color:#fff;border-color:#506981}
.footer-bottom{width:min(100% - 40px,1220px);margin:32px auto 0;padding-top:24px;border-top:1px solid #31485E;color:#B7CBDE;font-size:14px}
.mobile-bottom{display:none}
.drawer-overlay,.mobile-drawer{display:none}
@media (min-width:1280px){.container{padding-right:68px}}
@media (max-width:1100px){.float-tools{display:none}}
@media (max-width:1050px){
  .nav-core a{padding:8px 8px;font-size:14px}
  .header-actions .login-btn,.header-actions .register-btn{min-width:74px;padding:0 13px}
  .summary-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .topic-matrix{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:900px){.channel-strip{display:none}}
@media (max-width:820px){
  body{padding-bottom:64px}
  .header-inner{min-height:64px;padding:0 14px;display:grid;grid-template-columns:48px minmax(0,1fr) 68px;gap:8px}
  .menu-toggle{display:inline-flex;width:42px;height:42px;border:0;background:transparent;flex-direction:column;gap:5px;align-items:center;justify-content:center}
  .menu-toggle span{width:22px;height:2px;background:#143250;border-radius:3px}
  .site-logo{justify-self:center;min-width:0}
  .site-logo img{height:34px;max-width:145px}
  .site-logo .logo-placeholder{min-width:116px;height:34px;font-size:14px}
  .nav-core,.header-actions,.channel-strip{display:none}
  .mobile-login{display:inline-flex;align-items:center;justify-content:center;justify-self:end;height:40px;min-width:64px;padding:0 12px;background:#1C63E8;color:#fff;border-radius:999px;text-decoration:none;font-weight:800}
  .drawer-overlay{display:block;position:fixed;inset:0;background:rgba(14,35,56,.38);z-index:10000}
  .drawer-overlay[hidden]{display:none}
  .mobile-drawer{display:block;position:fixed;left:0;top:0;bottom:0;width:min(86vw,328px);background:#fff;z-index:10001;transform:translateX(-104%);transition:transform .24s ease;box-shadow:18px 0 42px rgba(14,35,56,.16)}
  .mobile-drawer.is-open{transform:translateX(0)}
  .drawer-head{min-height:68px;padding:12px 14px;border-bottom:1px solid #E2ECF7;display:flex;align-items:center;justify-content:space-between;gap:12px}
  .drawer-logo img{height:34px;width:auto;max-width:146px;object-fit:contain}
  .drawer-close{border:0;background:#EAF3FF;color:#143250;width:40px;height:40px;border-radius:50%;font-size:28px;line-height:1}
  .drawer-scroll{height:calc(100% - 68px);overflow-y:auto;padding:16px}
  .drawer-group{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px;margin-bottom:20px}
  .drawer-group strong{grid-column:1/-1;color:#143250;font-size:14px}
  .drawer-group a{padding:8px 10px;border-radius:10px;background:#F4F8FD;color:#425469;text-decoration:none;font-size:14px}
  .hero{padding:46px 0 42px}
  .section{padding:54px 0}
  .section.compact{padding:42px 0}
  .container,.reading{width:min(100% - 28px,100%)}
  .hero-grid,.split,.dual{grid-template-columns:1fr;gap:28px}
  .hero-grid .media{order:2}
  h1{font-size:clamp(30px,9vw,36px)}
  h2{font-size:28px}
  .lead{font-size:17px}
  .grid-3,.qa-grid,.review-grid,.link-grid{grid-template-columns:1fr}
  .topic-matrix{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .topic-card{padding:9px}
  .topic-card .topic-body{padding:12px 6px 6px}
  .media-hero{height:210px}
  .media-split{height:236px}
  .media-card{height:168px}
  .float-tools{display:none}
  .footer-inner{grid-template-columns:1fr 1fr}
  .mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:0;right:0;bottom:0;z-index:9000;background:#fff;border-top:1px solid #DCEAFB;box-shadow:0 -8px 24px rgba(16,48,84,.08)}
  .mobile-bottom a{min-height:56px;display:flex;align-items:center;justify-content:center;text-decoration:none;color:#143250;font-weight:800;font-size:14px}
  .table-row{grid-template-columns:1fr;gap:6px}
}
@media (max-width:560px){
  .summary-grid,.footer-inner{grid-template-columns:1fr}
  .section-head{display:block}
  .section-head p{margin-top:8px}
  .topic-matrix{grid-template-columns:repeat(2,minmax(0,1fr))}
  .topic-card h3{font-size:17px}
  .topic-card p{font-size:14px;line-height:1.65}
  .media-card{height:168px}
  .hero-actions{gap:8px}
  .btn-primary,.btn-secondary{min-height:40px}
}
@media (max-width:390px){
  .header-inner{grid-template-columns:44px minmax(0,1fr) 64px;padding:0 10px}
  .site-logo img{max-width:136px}
  .mobile-login{min-width:60px;padding:0 10px}
}