*{box-sizing:border-box}
:root{
  --bg:#0b1020;
  --bg2:#11182c;
  --panel:#151f38;
  --panel2:#1b2949;
  --line:rgba(170,207,255,.16);
  --text:#eef4ff;
  --muted:#9fb0cd;
  --title:#dff7ff;
  --cyan:#63e7ff;
  --violet:#a68cff;
  --pink:#ff7edb;
  --shadow:0 24px 70px rgba(0,0,0,.28);
}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,#09101e 0%,#0d1426 48%,#0a0f1d 100%);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.78;overflow-x:hidden}
body.nav-open{overflow:hidden}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:none}
img{max-width:100%}
button{font:inherit}
.topbar{position:sticky;top:0;z-index:10000;background:rgba(8,13,25,.91);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.topbar-inner{max-width:1200px;min-height:72px;margin:auto;padding:0 20px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:26px}
.brand{display:flex;align-items:center;min-width:160px}
.brand img{display:block;width:auto;height:42px;max-width:165px;object-fit:contain}
.brand strong{color:var(--title);font-size:20px;letter-spacing:.08em}
.desktop-nav{display:flex;align-items:center;justify-content:center;gap:4px}
.desktop-nav a{color:#d8e3f6;padding:10px 13px;border-radius:10px;font-weight:700;white-space:nowrap}
.desktop-nav a:hover,.desktop-nav a.active{background:rgba(99,231,255,.08);color:var(--cyan)}
.account-btn{display:inline-flex;align-items:center;justify-content:center;min-width:104px;height:42px;padding:0 18px;border-radius:12px;background:linear-gradient(135deg,var(--cyan),var(--violet) 55%,var(--pink));color:#06101b;font-weight:900;box-shadow:0 12px 30px rgba(99,231,255,.14)}
.topic-ribbon{background:#0e1629;border-top:1px solid rgba(255,255,255,.03)}
.topic-ribbon-inner{max-width:1200px;margin:auto;padding:8px 20px;display:flex;gap:8px;overflow-x:auto;scrollbar-width:none}
.topic-ribbon-inner::-webkit-scrollbar{display:none}
.topic-ribbon a{flex:0 0 auto;color:#9fb0cd;font-size:14px;font-weight:700;padding:4px 8px}
.topic-ribbon a:hover{color:var(--cyan)}
.nav-trigger{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:11px;background:#121d34;padding:10px}
.nav-trigger span{display:block;height:2px;background:#dff7ff;margin:4px 0}
.mobile-nav,.nav-mask{display:none}
.page{min-height:62vh}
.wrap{max-width:1200px;margin:auto;padding:0 20px}
.narrow{max-width:840px;margin:auto}
.section{padding:58px 0}
.section-sm{padding:34px 0}
.kicker{display:inline-block;color:var(--pink);font-size:12px;font-weight:900;letter-spacing:.16em;text-transform:uppercase;margin-bottom:10px}
h1,h2,h3{color:var(--title);line-height:1.22;margin-top:0}
h1{font-size:clamp(32px,4.4vw,52px);letter-spacing:-.025em;margin-bottom:18px}
h2{font-size:clamp(23px,3vw,31px);margin-bottom:14px}
h3{font-size:19px}
p{margin:0 0 16px}
.lead{font-size:18px;color:#dce8fa;max-width:760px}
.muted{color:var(--muted)}
.breadcrumb{max-width:1200px;margin:auto;padding:24px 20px 0;color:#7f91af;font-size:14px}
.breadcrumb a{color:#b8c8e3}
.hero{padding:44px 0 30px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);gap:28px;align-items:center}
.hero-copy{padding:18px 0}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.text-link{display:inline-flex;align-items:center;gap:8px;height:42px;padding:0 14px;border:1px solid var(--line);border-radius:11px;color:#dff7ff;background:rgba(255,255,255,.02);font-weight:800}
.text-link.primary{background:rgba(99,231,255,.11);border-color:rgba(99,231,255,.24);color:var(--cyan)}
.media{position:relative;overflow:hidden;border-radius:18px;background:#111a30;border:1px solid var(--line);box-shadow:var(--shadow);aspect-ratio:16/9}
.media img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center;display:block}
.media-fallback{width:100%;height:100%;background:radial-gradient(circle at 30% 20%,#1f3358 0,#14213c 46%,#10182b 100%)}
.media.hero-media{min-height:300px;aspect-ratio:auto}
.media.compact-media{height:205px;aspect-ratio:auto}
.media.feature-media{height:250px;aspect-ratio:auto}
.panel{background:linear-gradient(180deg,rgba(25,37,65,.96),rgba(17,25,45,.96));border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:0 18px 48px rgba(0,0,0,.18)}
.panel.soft{background:rgba(18,28,51,.76)}
.grid{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-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:26px;align-items:center}
.topic-mosaic{display:grid;grid-template-columns:1.35fr .85fr .85fr;grid-template-rows:auto auto;gap:16px}
.topic-mosaic .large{grid-row:1 / span 2}
.topic-mosaic .panel{min-height:170px}
.topic-mosaic .large{min-height:360px;display:flex;flex-direction:column;justify-content:space-between}
.topic-mosaic a{font-weight:900}
.route{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.route-step{position:relative;padding:20px 18px 20px 54px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:rgba(255,255,255,.02)}
.route-step b{position:absolute;left:17px;top:18px;display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--cyan),var(--violet));color:#09111d;font-size:13px}
.route-step h3{margin-bottom:6px;font-size:17px}
.route-step p{margin:0;color:var(--muted);font-size:14px}
.editorial{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);gap:24px}
.editorial-stack{display:grid;gap:16px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 0}
.tag-row a,.tag-row span{display:inline-flex;padding:7px 10px;border-radius:999px;border:1px solid var(--line);color:#b9c9e3;background:rgba(255,255,255,.02);font-size:13px}
.topic-list{display:grid;gap:10px}
.topic-list a{display:grid;grid-template-columns:1fr auto;gap:14px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line);color:#eef4ff}
.topic-list a span:last-child{color:var(--cyan);font-weight:900}
.prose{max-width:840px;margin:auto;font-size:17px}
.prose h2{margin-top:34px}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin-bottom:8px}
.prose .panel{margin:24px 0}
.prose-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.prose-links a{display:inline-flex;padding:8px 12px;border-radius:10px;background:#151f38;border:1px solid var(--line);font-weight:800}
.timeline{display:grid;gap:0}
.timeline-item{display:grid;grid-template-columns:78px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}
.timeline-item span{color:var(--pink);font-weight:900}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.compare .panel{height:100%}
.index-board{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.index-board a{display:block;padding:20px;border-radius:15px;background:#151f38;border:1px solid var(--line);color:#eef4ff;font-weight:900}
.index-board small{display:block;color:var(--muted);font-weight:400;margin-top:6px}
.notice{border-left:3px solid var(--cyan);padding:14px 16px;background:rgba(99,231,255,.06);color:#cfe9f3;border-radius:0 12px 12px 0}
.faq{display:grid;gap:14px}
.faq article{padding:22px;border-radius:16px;background:#151f38;border:1px solid var(--line)}
.faq h2{font-size:20px;margin-bottom:10px}
.footer{margin-top:46px;background:#070b14;border-top:1px solid var(--line)}
.footer-main{max-width:1200px;margin:auto;padding:44px 20px 28px;display:grid;grid-template-columns:1.25fr 1fr 1fr 1fr;gap:28px}
.footer-main>div{display:grid;align-content:start;gap:8px}
.footer h2{font-size:16px;margin-bottom:4px}
.footer a{color:#aebed9;font-size:14px}
.footer-brand img{height:40px;width:auto;max-width:160px;object-fit:contain}
.footer-brand p{font-size:14px;color:#7f91af;max-width:280px}
.footer-bottom{max-width:1200px;margin:auto;padding:18px 20px;border-top:1px solid rgba(255,255,255,.06);display:flex;justify-content:space-between;gap:20px;color:#6f819e;font-size:13px}
.mobile-dock{display:none}
@media(max-width:980px){
  .topbar-inner{grid-template-columns:42px 1fr auto;gap:12px}
  .nav-trigger{display:block}
  .brand{justify-content:center;min-width:0}
  .brand img{height:38px;max-width:148px}
  .desktop-nav,.topic-ribbon{display:none}
  .mobile-nav{display:block;position:fixed;z-index:13000;left:0;top:0;bottom:0;width:min(86vw,330px);background:#0d1528;border-right:1px solid var(--line);transform:translateX(-105%);transition:transform .22s ease;overflow-y:auto}
  .mobile-nav.open{transform:translateX(0)}
  .nav-mask{display:none;position:fixed;inset:0;z-index:12000;background:rgba(2,6,12,.62);opacity:0;pointer-events:none}
  .nav-mask.show{display:block;opacity:1;pointer-events:auto}
  .mobile-nav-head{display:flex;align-items:center;justify-content:space-between;padding:18px;border-bottom:1px solid var(--line);font-weight:900;color:var(--title)}
  .nav-close{width:38px;height:38px;border:1px solid var(--line);border-radius:10px;background:#151f38;color:#dff7ff;font-size:25px}
  .mobile-nav-group{padding:16px 18px;border-bottom:1px solid rgba(255,255,255,.06)}
  .mobile-nav-group h2{font-size:13px;color:var(--pink);margin:0 0 8px}
  .mobile-nav-group a{display:block;color:#eaf2ff;padding:7px 0}
  .hero-grid,.split,.editorial{grid-template-columns:1fr}
  .hero-media{order:-1}
  .topic-mosaic{grid-template-columns:1fr 1fr}
  .topic-mosaic .large{grid-column:1 / -1;grid-row:auto;min-height:0}
  .route{grid-template-columns:1fr 1fr}
  .footer-main{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  body{padding-bottom:64px}
  .topbar-inner{min-height:64px;padding:0 12px}
  .brand img{height:34px;max-width:128px}
  .account-btn{height:39px;min-width:84px;padding:0 12px;font-size:14px}
  .section{padding:40px 0}
  .section-sm{padding:26px 0}
  .wrap,.breadcrumb{padding-left:14px;padding-right:14px}
  .hero{padding-top:24px}
  .hero-media{min-height:190px}
  .grid-2,.grid-3,.grid-4,.compare,.topic-mosaic,.route,.index-board{grid-template-columns:1fr}
  .topic-mosaic .large{grid-column:auto}
  .media.feature-media{height:215px}
  .media.compact-media{height:180px}
  .prose{font-size:16px}
  .timeline-item{grid-template-columns:1fr;gap:4px}
  .footer-main{grid-template-columns:1fr}
  .footer-bottom{display:block}
  .mobile-dock{display:grid;position:fixed;z-index:11000;left:0;right:0;bottom:0;grid-template-columns:repeat(4,1fr);background:#070b14;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
  .mobile-dock a{text-align:center;color:#d7e4f7;padding:11px 4px;font-size:14px}
}
@media(max-width:430px){
  .account-btn{min-width:80px;padding:0 10px}
  .brand strong{font-size:16px}
}