*{box-sizing:border-box}
:root{--bg:#111722;--panel:#18202D;--panel2:#1E2736;--panel3:#253044;--gold:#F0D89A;--gold2:#E4C77D;--text:#E8EDF6;--muted:#BAC3D2;--soft:#8F9AAF;--footer:#0B1018;--line:rgba(240,216,154,.14);--shadow:0 16px 42px rgba(0,0,0,.26)}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;overflow-x:hidden}
body.drawer-open{overflow:hidden}
a{color:inherit;text-decoration:none}
a:hover{color:var(--gold2)}
img{max-width:100%;height:auto}
button,input,select,textarea{font:inherit}
.site-header{position:sticky;top:0;z-index:9999;width:100%;background:#111722;box-shadow:0 10px 30px rgba(0,0,0,.24)}
.header-inner{max-width:1280px;min-height:72px;margin:0 auto;padding:0 22px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:24px}
.brand-logo,.mobile-logo,.drawer-logo,.footer-logo{display:inline-flex;align-items:center}
.brand-logo img,.mobile-logo img,.drawer-logo img,.footer-logo img{height:46px;width:auto;max-width:165px;object-fit:contain}
.logo-fallback{display:inline-flex;align-items:center;justify-content:center;color:var(--gold);font-weight:800;letter-spacing:.12em;font-size:24px;white-space:nowrap}
.main-nav{display:flex;justify-content:center;align-items:center;gap:clamp(14px,2vw,28px);min-width:0}
.main-nav a{white-space:nowrap;color:var(--muted);font-weight:700;font-size:15px;padding:8px 0;border-bottom:2px solid transparent}
.main-nav a.active,.main-nav a:hover{color:var(--gold);border-color:var(--gold)}
.account-actions{display:flex;align-items:center;gap:12px;white-space:nowrap}
.login-link{font-weight:700;color:var(--text)}
.primary-button{display:inline-flex;align-items:center;justify-content:center;background:var(--gold);color:#111722!important;font-weight:800;border-radius:999px;padding:12px 20px;line-height:1.2;box-shadow:0 8px 22px rgba(0,0,0,.22)}
.primary-button:hover{background:var(--gold2)}
.primary-button.compact{padding:10px 18px}
.category-nav{background:#151D29;border-top:1px solid rgba(255,255,255,.03);border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:thin}
.category-track{max-width:1280px;margin:0 auto;padding:10px 22px;display:flex;gap:20px;white-space:nowrap}
.category-track a{color:var(--muted);font-size:14px}
.mobile-header{display:none;min-height:64px;padding:0 14px;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:8px}
.menu-toggle,.drawer-close{border:0;background:transparent;color:var(--text);cursor:pointer}
.menu-toggle{width:40px;height:40px;padding:9px;display:grid;align-content:center;gap:5px}
.menu-toggle span{display:block;height:2px;background:var(--text);border-radius:2px}
.mobile-logo{justify-content:center;min-width:0}
.mobile-logo img{height:40px;max-width:142px}
.mobile-register{padding:9px 11px;font-size:13px;white-space:nowrap}
.drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,.58);z-index:10000}
.mobile-drawer{position:fixed;left:0;top:0;bottom:0;width:min(86vw,330px);background:#18202D;z-index:10001;transform:translateX(-104%);transition:transform .24s ease;box-shadow:20px 0 50px rgba(0,0,0,.38)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{min-height:70px;padding:12px 16px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}
.drawer-close{font-size:34px;line-height:1;width:42px;height:42px}
.drawer-scroll{height:calc(100% - 70px);overflow-y:auto;padding:14px 16px 30px}
.drawer-group{padding:10px 0 14px;border-bottom:1px solid rgba(255,255,255,.06)}
.drawer-group h2{font-size:13px;text-transform:uppercase;letter-spacing:.12em;color:var(--gold);margin:0 0 7px}
.drawer-group a{display:block;padding:8px 2px;color:var(--muted)}
#main-content{min-height:60vh}
.container{width:min(1280px,calc(100% - 44px));margin:0 auto}
.article{width:min(860px,calc(100% - 44px));margin:0 auto}
.section{padding:84px 0}
.section.tight{padding:58px 0}
.section.alt{background:var(--panel)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--gold);font-weight:800;font-size:13px;letter-spacing:.12em;text-transform:uppercase;margin-bottom:12px}
h1,h2,h3{line-height:1.25;margin-top:0;color:var(--gold)}
h1{font-size:clamp(32px,4.1vw,52px);margin-bottom:18px;letter-spacing:-.02em}
h2{font-size:clamp(26px,3vw,36px);margin-bottom:16px}
h3{font-size:20px;margin-bottom:10px}
p{margin:0 0 18px;color:var(--muted)}
.lead{font-size:18px;max-width:780px;color:var(--text)}
.hero-copy{padding:66px 0 34px}
.breadcrumbs{font-size:14px;color:var(--soft);margin-bottom:18px}
.breadcrumbs a{color:var(--muted)}
.hero-carousel{position:relative}
.hero-slide{display:none}
.hero-slide.active{display:block}
.hero-stage{position:relative;border-radius:18px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);background:var(--panel)}
.hero-media{aspect-ratio:16/7;min-height:260px;max-height:380px;position:relative;background:#111722}
.hero-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center}
.hero-caption{padding:24px 28px;display:flex;align-items:center;justify-content:space-between;gap:24px;background:linear-gradient(90deg,#18202D,#1E2736)}
.hero-caption p{margin:0;max-width:760px}
.hero-dots{display:flex;justify-content:center;gap:8px;margin-top:16px}
.hero-dots button{width:34px;height:6px;border:0;border-radius:999px;background:#3A4557;cursor:pointer}
.hero-dots button.active{background:var(--gold)}
.grid{display:grid;gap:24px}
.guide-grid{grid-template-columns:1.35fr .9fr;grid-template-rows:auto auto}
.guide-grid .feature-panel{grid-row:1/3}
.panel,.feature-panel,.card,.notice{background:var(--panel2);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.panel,.feature-panel{padding:30px}
.card{padding:24px}
.notice{padding:24px 26px}
.feature-panel{background:linear-gradient(145deg,#253044,#1E2736)}
.text-link{color:var(--gold);font-weight:800;display:inline-flex;gap:8px;align-items:center}
.text-link::after{content:"→"}
.timeline{display:grid;gap:0;border-left:1px solid var(--line);margin-left:10px}
.timeline-item{position:relative;padding:0 0 28px 30px}
.timeline-item::before{content:"";position:absolute;left:-6px;top:7px;width:11px;height:11px;border-radius:50%;background:var(--gold)}
.timeline-item:last-child{padding-bottom:0}
.timeline-item h3{margin-bottom:6px}
.timeline-item p{margin-bottom:0}
.split{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:42px;align-items:center}
.split.reverse{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr)}
.split.reverse .media-wrap{order:2}
.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:16px;background:#111722;border:1px solid rgba(240,216,154,.10)}
.media img{position:absolute;inset:0;width:100%;height:100%;display:block;object-fit:contain;object-position:center center}
.media-placeholder{position:absolute;inset:0;background:linear-gradient(135deg,#111722,#1E2736)}
.media.poster{aspect-ratio:16/7;min-height:260px;max-height:380px}
.media.topic{aspect-ratio:16/10;min-height:150px;max-height:210px}
.media.feature{aspect-ratio:4/3;min-height:220px;max-height:320px}
.media.app{aspect-ratio:4/3;min-height:210px;max-height:300px}
.channel-grid{grid-template-columns:1.25fr .8fr .8fr;align-items:start}
.channel-grid .wide{grid-row:span 2;min-height:330px}
.topic-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.topic-card{background:var(--panel2);border:1px solid var(--line);border-radius:14px;overflow:hidden;min-width:0}
.topic-card-body{padding:18px}
.topic-card h3{font-size:18px}
.topic-card p{font-size:14px;margin-bottom:10px}
.service-grid{grid-template-columns:1fr 1fr}
.service-list,.security-list{display:grid;gap:14px}
.service-row{padding:18px 0;border-bottom:1px solid var(--line)}
.service-row:last-child{border-bottom:0}
.feedback-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.quote{padding:24px;background:var(--panel2);border:1px solid var(--line);border-radius:14px}
.quote p{margin:0;color:var(--text)}
.faq{display:grid;gap:14px}
.faq-item{padding:22px 24px;background:var(--panel2);border:1px solid var(--line);border-radius:14px}
.faq-item h3{color:var(--text);font-size:18px}
.faq-item p{margin:0}
.link-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.link-list a{padding:15px 17px;background:var(--panel2);border:1px solid var(--line);border-radius:12px;color:var(--muted)}
.link-list a:hover{border-color:rgba(240,216,154,.36);color:var(--gold)}
.summary-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden}
.summary-strip div{background:var(--panel2);padding:24px}
.summary-strip strong{display:block;color:var(--gold);font-size:18px;margin-bottom:5px}
.reading-columns{display:grid;grid-template-columns:1.1fr .9fr;gap:28px}
.stack{display:grid;gap:24px}
.feature-list{margin:0;padding:0;list-style:none;display:grid;gap:12px}
.feature-list li{position:relative;padding-left:22px;color:var(--muted)}
.feature-list li::before{content:"";position:absolute;left:0;top:.72em;width:7px;height:7px;border-radius:50%;background:var(--gold)}
.tag-row{display:flex;flex-wrap:wrap;gap:9px;margin:18px 0}
.tag{padding:5px 11px;border-radius:999px;background:rgba(240,216,154,.09);border:1px solid var(--line);color:var(--gold);font-size:13px}
.cta-line{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 26px;background:var(--panel3);border:1px solid var(--line);border-radius:16px}
.cta-line p{margin:0}
.site-footer{background:var(--footer);padding:62px 0 98px;border-top:1px solid var(--line)}
.footer-grid{width:min(1280px,calc(100% - 44px));margin:0 auto;display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:34px}
.footer-grid h2{font-size:16px;color:var(--gold);margin-bottom:12px}
.footer-grid a{display:block;color:var(--muted);padding:4px 0;font-size:14px}
.footer-brand p{max-width:320px;font-size:14px;margin-top:14px}
.footer-note{width:min(1280px,calc(100% - 44px));margin:34px auto 0;padding-top:24px;border-top:1px solid rgba(255,255,255,.06);display:flex;justify-content:space-between;gap:30px}
.footer-note p{font-size:13px;color:var(--soft);margin:0}
.desktop-tools{position:fixed;right:18px;bottom:22px;z-index:500;display:grid;gap:8px;width:118px}
.desktop-tools a,.desktop-tools button{display:flex;align-items:center;justify-content:center;min-height:38px;padding:7px 10px;border:1px solid var(--line);border-radius:10px;background:var(--panel2);color:var(--muted);font-size:13px;cursor:pointer}
.desktop-tools .tool-register{background:var(--gold);color:#111722;font-weight:800}
.mobile-bottom-nav{display:none}
@media (max-width:1120px){
  .header-inner{gap:14px;padding:0 16px}
  .main-nav{gap:12px}
  .main-nav a{font-size:14px}
  .brand-logo img{max-width:135px}
  .account-actions{gap:8px}
  .topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:900px){
  .desktop-header{display:none}
  .mobile-header{display:grid}
  .desktop-tools{display:none}
  .container,.article{width:min(100% - 32px,1280px)}
  .article{max-width:860px}
  .section{padding:62px 0}
  .section.tight{padding:46px 0}
  .guide-grid,.split,.split.reverse,.reading-columns,.service-grid{grid-template-columns:1fr}
  .guide-grid .feature-panel{grid-row:auto}
  .split.reverse .media-wrap{order:0}
  .channel-grid{grid-template-columns:1fr 1fr}
  .channel-grid .wide{grid-column:1/-1;grid-row:auto;min-height:auto}
  .topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .feedback-grid{grid-template-columns:1fr 1fr}
  .summary-strip{grid-template-columns:1fr}
  .hero-media,.media.poster{aspect-ratio:16/8;min-height:220px;max-height:320px}
  .hero-caption{align-items:flex-start}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .footer-note{display:block}
  .footer-note p+p{margin-top:10px}
}
@media (max-width:640px){
  body{font-size:16px;padding-bottom:68px}
  .mobile-header{grid-template-columns:40px minmax(0,1fr) auto;padding:0 10px;min-height:62px}
  .mobile-logo img{height:38px;max-width:125px}
  .logo-fallback{font-size:20px}
  .mobile-register{font-size:12px;padding:8px 9px}
  .container,.article{width:calc(100% - 28px)}
  .section{padding:52px 0}
  .section.tight{padding:40px 0}
  .hero-copy{padding:42px 0 24px}
  h1{font-size:clamp(30px,9vw,36px)}
  h2{font-size:27px}
  .hero-media,.media.poster{aspect-ratio:16/10;min-height:190px;max-height:280px}
  .hero-caption{display:block;padding:20px}
  .hero-caption .primary-button{margin-top:16px}
  .panel,.feature-panel{padding:22px}
  .channel-grid,.topic-grid,.feedback-grid,.footer-grid{grid-template-columns:1fr 1fr}
  .topic-card-body{padding:15px}
  .topic-card h3{font-size:16px}
  .link-list{grid-template-columns:1fr}
  .cta-line{display:block}
  .cta-line .primary-button{margin-top:14px}
  .footer-grid{gap:24px}
  .footer-brand{grid-column:1/-1}
  .site-footer{padding:52px 0 34px}
  .mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:9000;height:64px;padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);align-items:center;background:#0B1018;border-top:1px solid var(--line)}
  .mobile-bottom-nav a{text-align:center;font-size:13px;color:var(--muted)}
}
@media (max-width:420px){
  .mobile-register{max-width:86px;text-align:center}
  .topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .channel-grid,.feedback-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}