*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#eef5fb;color:#223449;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:inherit}.site-header{position:sticky;top:0;z-index:9000;width:100%;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);box-shadow:0 8px 24px rgba(21,83,134,.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}.site-logo img,.drawer-logo img,.footer-brand img{display:block;width:auto;object-fit:contain}.site-logo img{height:38px;max-width:154px}.nav-core{display:flex;align-items:center;justify-content:center;gap:2px;min-width:0}.nav-core a{position:relative;padding:24px 10px 22px;text-decoration:none;font-size:15px;font-weight:700;white-space:nowrap;color:#334b66}.nav-core 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rgba(20,124,201,.1);box-shadow:0 7px 20px rgba(40,88,126,.05)}.topic-board a:hover{color:#147cc9;border-color:rgba(20,124,201,.25)}.notice-band{background:#dff1fb;border-radius:18px;padding:22px 26px;display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start}.notice-mark{width:42px;height:42px;border-radius:13px;display:flex;align-items:center;justify-content:center;background:#147cc9;color:#fff;font-weight:900}.notice-band h2{margin:1px 0 8px;color:#1f4867;font-size:21px}.notice-band p{margin:0;color:#5f7283;line-height:1.85}.article-wrap{max-width:850px;margin:0 auto}.breadcrumbs{font-size:13px;color:#76899b;margin:0 0 14px}.breadcrumbs a{text-decoration:none;color:#147cc9}.article-head{background:#fff;border-radius:20px;padding:30px;box-shadow:0 12px 28px rgba(40,88,126,.07);margin-bottom:20px}.article-head h1{font-size:clamp(28px,4vw,39px)}.article-head p{margin:13px 0 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p{margin:0;color:#61788c;line-height:1.75;font-size:14px}.step-list{counter-reset:step;display:grid;gap:12px}.step-item{position:relative;padding:18px 18px 18px 58px;background:#f3f9fd;border-radius:14px}.step-item:before{counter-increment:step;content:counter(step);position:absolute;left:16px;top:16px;width:28px;height:28px;border-radius:9px;background:#147cc9;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900}.step-item strong{color:#244b66}.step-item p{margin:5px 0 0!important;font-size:14px!important}.faq-list details{background:#f6fbfe;border-radius:14px;padding:16px 18px;margin-bottom:10px}.faq-list summary{cursor:pointer;font-weight:800;color:#254b66}.faq-list p{margin:12px 0 0}.site-footer{background:#102d45;color:#eaf5fb;padding:42px 18px 24px}.footer-grid{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1.45fr 1fr 1fr 1fr;gap:30px}.footer-brand img{height:40px;max-width:160px}.footer-brand p{line-height:1.8;color:#c9dbe7}.footer-grid strong{display:block;margin-bottom:12px}.footer-grid a{display:block;color:#ccdfeb;text-decoration:none;padding:5px 0;font-size:14px}.footer-grid a:hover{color:#fff}.footer-bottom{max-width:1180px;margin:28px auto 0;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;line-height:1.8;color:#b9cfdd}.side-actions{position:fixed;right:14px;top:50%;transform:translateY(-50%);z-index:8000;width:58px;background:#fff;border-radius:15px;box-shadow:0 12px 32px rgba(38,78,110,.16);overflow:hidden}.side-actions a,.side-actions button{width:100%;min-height:46px;border:0;border-bottom:1px solid #edf3f7;background:#fff;color:#35617e;display:flex;align-items:center;justify-content:center;text-decoration:none;font-size:12px;font-weight:800;cursor:pointer;touch-action:manipulation}.side-actions .side-main{background:linear-gradient(135deg,#35b7f1,#147cc9);color:#fff}.mobile-bottom{display:none}.mobile-drawer,.drawer-mask{display:none}.logo-placeholder{display:block;width:148px;height:36px;border-radius:10px;background:#e7f3fb}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid #edf2f5}.drawer-logo img{height:36px;max-width:145px}.drawer-close{border:0;background:#edf7fd;color:#147cc9;border-radius:10px;min-height:40px;padding:0 12px;font-weight:800;touch-action:manipulation}.drawer-auth{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:14px 16px}.drawer-auth a{display:flex;align-items:center;justify-content:center;height:42px;border-radius:11px;text-decoration:none;font-weight:800}.drawer-auth a:first-child{background:#147cc9;color:#fff}.drawer-auth a:last-child{background:#edf7fd;color:#147cc9;border:1px solid rgba(20,124,201,.17)}.drawer-group{padding:10px 16px 14px}.drawer-group strong{display:block;font-size:12px;color:#91a1ae;margin:4px 0 8px}.drawer-group a{display:block;padding:10px 4px;text-decoration:none;color:#31516c;border-bottom:1px solid #f0f4f7}.drawer-open{overflow:hidden}@media(max-width:1120px){.nav-core a{padding-left:7px;padding-right:7px;font-size:14px}.auth-btn{min-width:64px;padding:0 12px}.side-actions{display:none}}@media(max-width:980px){.site-header{position:sticky}.header-inner{min-height:62px;padding:0 12px;display:grid;grid-template-columns:72px 1fr 132px;gap:8px}.menu-btn{display:inline-flex;align-items:center;justify-content:center;justify-self:start}.site-logo{justify-self:center}.site-logo img{height:34px;max-width:136px}.nav-core{display:none}.auth-actions{gap:5px;justify-self:end}.auth-btn{height:38px;min-width:61px;padding:0 9px;font-size:13px}.channel-bar{display:none}.site-main{padding:20px 13px 86px}.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);overflow-y:auto}.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}.mobile-bottom{position:fixed;z-index:8500;display:grid;grid-template-columns:repeat(5,1fr);left:0;right:0;bottom:0;background:#fff;border-top:1px solid rgba(20,124,201,.15);padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{min-height:54px;display:flex;align-items:center;justify-content:center;text-decoration:none;color:#4a677c;font-size:12px;font-weight:800}.hero-carousel{aspect-ratio:16/7.5;border-radius:15px}.carousel-arrow{width:36px;height:36px}.carousel-arrow.prev{left:9px}.carousel-arrow.next{right:9px}.hero-intro{grid-template-columns:1fr}.channel-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.split-feature{grid-template-columns:1fr}.topic-board{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:1fr 1fr}.quick-grid{grid-template-columns:1fr 1fr}.article-head,.article-card{padding:22px}.section{margin-bottom:32px}}@media(max-width:560px){.header-inner{grid-template-columns:64px 1fr 118px}.site-logo img{height:30px;max-width:118px}.auth-btn{min-width:55px;padding:0 7px}.hero-copy,.hero-side{padding:23px}.hero-copy h1{font-size:29px}.lead{font-size:16px}.channel-grid{grid-template-columns:1fr 1fr;gap:10px}.channel-card{padding:16px}.channel-card strong{font-size:16px}.channel-card p{font-size:13px}.split-feature{padding:14px}.feature-copy h2,.section-title h2{font-size:24px}.topic-board{grid-template-columns:1fr 1fr}.notice-band{grid-template-columns:1fr;padding:20px}.footer-grid{grid-template-columns:1fr}.quick-grid,.two-col{grid-template-columns:1fr}.article-head h1{font-size:28px}.article-head,.article-card{padding:19px}.article-card h2{font-size:21px}}
/* v5 visual refresh */
body{background:linear-gradient(180deg,#f2f7fc 0,#e9f1f9 100%)}
.site-header{border-bottom:1px solid rgba(20,86,148,.08)}
.channel-bar{background:#f7fbff}
.hero-intro{background:linear-gradient(135deg,#ffffff 0%,#f1f7ff 65%,#e7f2ff 100%)}
.channel-card{background:linear-gradient(160deg,#fff,#f7fbff)}
.channel-card .num{font-size:12px;letter-spacing:.12em;color:#137CD8}
.world-ribbon{max-width:1140px;margin:0 auto 26px;padding:14px 18px;border:1px solid rgba(47,168,247,.14);border-radius:14px;background:#fff;display:flex;gap:12px;align-items:center;flex-wrap:wrap;box-shadow:0 10px 28px rgba(19,124,216,.08)}
.world-ribbon strong{color:#137CD8}.world-ribbon a{padding:7px 12px;border-radius:999px;background:#edf6ff;text-decoration:none;font-weight:700;color:#24435f}.world-ribbon a:hover{background:#dcefff;color:#137CD8}
.feature-stack{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}.feature-stack .article-card{margin:0}
@media(max-width:760px){.feature-stack{grid-template-columns:1fr}.world-ribbon{margin-left:14px;margin-right:14px}}