:root{
  --page:#F6F8FF;--soft:#ECF0FF;--sky:#EAF7FF;--card:#FFFFFF;--title:#1D2B5F;--text:#222222;--muted:#5B647A;--primary:#597EF7;--line:rgba(89,126,247,.16);--shadow:0 16px 40px rgba(89,126,247,.10);--footer:#1F1F1F;--footerText:#D7DCE8;
}
*{box-sizing:border-box;max-width:100%}
html{scroll-behavior:smooth;background:var(--page);overflow-x:hidden}
body{margin:0;background:var(--page);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.78;overflow-x:hidden}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:none}
img{max-width:100%}
button,input,select{font:inherit}
.site-header{position:sticky;top:0;z-index:9999;width:100%;background:linear-gradient(135deg,#F7F9FF 0%,#ECF0FF 52%,#EAF7FF 100%);box-shadow:0 8px 24px rgba(89,126,247,.10);backdrop-filter:blur(12px)}
.header-inner{max-width:1200px;min-height:72px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.site-logo{display:inline-flex;align-items:center;flex:0 0 auto;min-width:132px}
.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain;object-position:center}
.logo-placeholder{display:inline-flex;align-items:center;justify-content:center;min-width:132px;height:40px;padding:0 14px;border-radius:12px;background:#fff;color:#1D2B5F;font-weight:800;letter-spacing:.05em;border:1px solid var(--line)}
.nav-core{display:flex;align-items:center;gap:6px;white-space:nowrap;flex-wrap:nowrap;min-width:0}
.nav-core a{color:#1D2B5F;padding:8px 9px;border-radius:999px;font-weight:700;font-size:14px;text-decoration:none}
.nav-core a.is-current,.nav-core a:hover{background:rgba(255,255,255,.82);color:#597EF7}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;white-space:nowrap}
.header-login{height:42px;display:inline-flex;align-items:center;padding:0 12px;color:#1D2B5F;font-weight:700}
.main-btn{position:relative;overflow:hidden;isolation:isolate;display:inline-flex;align-items:center;justify-content:center;height:42px;min-width:96px;padding:0 20px;background:linear-gradient(135deg,#7580EE 0%,#597EF7 48%,#7AC4F5 100%);color:#FFFFFF;border-radius:999px;text-decoration:none;font-weight:700;box-shadow:0 10px 24px rgba(89,126,247,.28);white-space:nowrap}
.main-btn::before{content:"";position:absolute;inset:-2px;border-radius:inherit;background:linear-gradient(120deg,transparent 0%,rgba(255,255,255,.85) 35%,transparent 70%);transform:translateX(-120%);animation:btnShine 2.4s infinite;z-index:-1}
.main-btn::after{content:"";position:absolute;inset:-1px;border-radius:inherit;border:1px solid rgba(255,255,255,.65);box-shadow:0 0 8px rgba(122,196,245,.55),0 0 18px rgba(89,126,247,.35);pointer-events:none}
@keyframes btnShine{0%{transform:translateX(-120%)}55%{transform:translateX(120%)}100%{transform:translateX(120%)}}
.mobile-header{display:none}
.channel-bar{background:#fff;border-bottom:1px solid #edf0f8;position:relative;z-index:20}
.channel-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:6px;overflow-x:auto;overscroll-behavior-inline:contain;scrollbar-width:thin;white-space:nowrap}
.channel-inner a{display:inline-flex;align-items:center;height:46px;padding:0 9px;color:#5B647A;font-size:13px;font-weight:700;flex:0 0 auto}
.channel-inner a:hover,.channel-inner a.is-current{color:#597EF7}
.site-main{min-height:60vh}
.shell{width:min(1200px,calc(100% - 40px));margin:0 auto}
.reading{width:min(860px,calc(100% - 40px));margin:0 auto}
.hero{padding:62px 0 28px}
.hero.compact{padding:50px 0 18px}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:34px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;min-height:32px;padding:0 12px;border-radius:999px;background:#EAF7FF;color:#4868d7;font-size:14px;font-weight:800;letter-spacing:.04em}
h1,h2,h3{color:var(--title);line-height:1.28;margin-top:0}
h1{font-size:clamp(38px,4.2vw,50px);margin:16px 0 18px;letter-spacing:-.025em}
h2{font-size:clamp(24px,2.6vw,32px);margin-bottom:14px}
h3{font-size:20px;margin-bottom:10px}
p{font-size:17px;margin:0 0 16px}
.lead{font-size:19px;color:#42506f;max-width:760px}
.muted{color:var(--muted)}
.section{padding:56px 0}
.section.tight{padding:36px 0}
.section.soft{background:linear-gradient(180deg,#F8FAFF 0%,#EEF4FF 100%);border-top:1px solid #eef2ff;border-bottom:1px solid #eef2ff}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:24px}
.section-head p{margin:0;color:var(--muted);max-width:620px}
.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}
.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow)}
.card p:last-child{margin-bottom:0}
.card-link{display:inline-flex;align-items:center;gap:6px;margin-top:8px;font-weight:800}
.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:16px;background:#ECF0FF;aspect-ratio:16/9}
.media > img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center center;display:block}
.media.card-media{height:172px;aspect-ratio:auto}
.media.feature-media{height:248px;aspect-ratio:auto}
.media-placeholder{display:flex;align-items:center;justify-content:center;width:100%;height:100%;min-height:inherit;color:#6d7892;font-weight:800;letter-spacing:.08em;background:linear-gradient(135deg,#ECF0FF,#EAF7FF)}
.content-pair{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.content-pair.reverse .pair-copy{order:2}.content-pair.reverse .pair-media{order:1}
.link-pills{display:flex;gap:10px;overflow-x:auto;padding:2px 0 10px;scrollbar-width:thin}
.link-pills a{flex:0 0 auto;padding:9px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#34456c;font-weight:800;white-space:nowrap}
.notice-strip{display:flex;gap:14px;align-items:flex-start;padding:20px 24px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 28px rgba(89,126,247,.07)}
.notice-strip strong{color:#597EF7;white-space:nowrap}
.topic-matrix .card{padding:18px}.topic-matrix h3{font-size:18px;margin:0 0 8px}.topic-matrix p{font-size:15px;color:#5B647A;line-height:1.65;margin-bottom:10px}
.index-carousel{position:relative;height:360px;background:#101827;border-radius:18px;overflow:hidden;box-shadow:0 18px 50px rgba(16,24,39,.2)}
.carousel-slide{position:absolute;inset:0;display:none;align-items:center;justify-content:center;padding:18px}.carousel-slide.is-active{display:flex}
.carousel-slide .media{height:100%;aspect-ratio:auto;background:#101827;border-radius:14px}.carousel-slide .media img{object-fit:contain;background:#101827}
.carousel-slide .media-placeholder{background:#152238;color:#cbd7f5}
.carousel-control{position:absolute;top:50%;transform:translateY(-50%);width:42px;height:42px;border:0;border-radius:50%;background:rgba(255,255,255,.9);color:#1D2B5F;font-size:24px;cursor:pointer;z-index:3}.carousel-control.prev{left:14px}.carousel-control.next{right:14px}
.carousel-dots{position:absolute;left:50%;bottom:14px;transform:translateX(-50%);display:flex;gap:8px;z-index:3}.carousel-dots button{width:10px;height:10px;padding:0;border:0;border-radius:50%;background:rgba(255,255,255,.44);cursor:pointer}.carousel-dots button.is-active{background:#fff;transform:scale(1.2)}
.article{font-size:17px}.article p{font-size:17px}.article ul,.article ol{padding-left:1.35em;margin:12px 0 22px}.article li{margin:8px 0}.article h2{margin-top:34px}.article h3{margin-top:26px}
.article-intro{padding:28px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.reading-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:22px 0}.reading-index a{padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:14px;color:#2f426d;font-weight:800}
.steps{counter-reset:step;display:grid;gap:14px;padding:0;margin:22px 0;list-style:none}.steps li{position:relative;padding:18px 18px 18px 58px;background:#fff;border:1px solid var(--line);border-radius:16px}.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:18px;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#597EF7;color:#fff;font-weight:800}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:18px}.compare > div{padding:22px;background:#fff;border:1px solid var(--line);border-radius:16px}
.quote-note{padding:20px 22px;border-left:4px solid #597EF7;background:#F0F5FF;border-radius:0 14px 14px 0;color:#34456c;margin:22px 0}
.qa-list{display:grid;gap:16px}.qa-item{padding:22px;background:#fff;border:1px solid var(--line);border-radius:16px}.qa-item h3{margin-bottom:8px}.qa-item p{margin-bottom:0}
.tag-row{display:flex;flex-wrap:wrap;gap:10px}.tag-row a,.tag-row span{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:#EDF3FF;color:#425a9a;font-weight:800;font-size:14px}
.app-banner{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center;background:linear-gradient(135deg,#ECF0FF,#EAF7FF);padding:28px;border:1px solid var(--line);border-radius:18px}
.app-banner p{margin:0;color:#51607c}
.floating-tools{position:fixed;right:14px;top:50%;transform:translateY(-50%);z-index:50;display:flex;flex-direction:column;width:110px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow);gap:6px}.floating-tools a,.floating-tools button{border:0;background:#fff;color:#597EF7;min-height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;text-align:center;font-weight:800;font-size:13px;cursor:pointer}.floating-tools .floating-register{color:#fff;background:linear-gradient(135deg,#7580EE,#597EF7,#7AC4F5);height:40px;min-width:0;padding:0 8px}
.site-footer{background:#1F1F1F;color:#D7DCE8;margin-top:72px}.footer-grid{width:min(1200px,calc(100% - 40px));margin:0 auto;padding:52px 0 34px;display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:32px}.site-footer h2{font-size:16px;color:#fff;margin-bottom:14px}.site-footer a{display:block;color:#D7DCE8;margin:7px 0;font-size:14px}.site-footer p{font-size:14px;color:#bfc6d5}.footer-logo img{filter:brightness(1.18)}.footer-placeholder{background:#2b2b2b;color:#fff;border-color:#444}.footer-bottom{border-top:1px solid #343434;width:min(1200px,calc(100% - 40px));margin:0 auto;padding:20px 0 28px;display:flex;justify-content:space-between;gap:24px}.footer-bottom p{margin:0}
.mobile-bottom{display:none}
.mobile-drawer,.drawer-overlay{display:none}
.noscript-mobile-nav{display:none}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;color:#71809f;font-size:14px;margin-bottom:12px}.breadcrumbs a{color:#597EF7}.breadcrumbs span::before{content:"/";margin-right:8px;color:#aab3c7}
.mini-list{display:grid;gap:10px}.mini-list a{padding:12px 14px;border-radius:12px;background:#F7F9FF;border:1px solid #edf1ff;color:#33466f;font-weight:700}
.stateless-table{width:100%;border-collapse:separate;border-spacing:0 10px}.stateless-table th,.stateless-table td{text-align:left;padding:14px 16px;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.stateless-table th:first-child,.stateless-table td:first-child{border-left:1px solid var(--line);border-radius:12px 0 0 12px}.stateless-table th:last-child,.stateless-table td:last-child{border-right:1px solid var(--line);border-radius:0 12px 12px 0}.stateless-table th{color:#1D2B5F}
@media (min-width:1280px){.site-main{padding-right:68px}}
@media (max-width:1080px){.nav-core{gap:2px}.nav-core a{padding:8px 6px;font-size:13px}.header-inner{padding:0 14px}.grid-4{grid-template-columns:repeat(3,minmax(0,1fr))}.floating-tools{display:none}.site-main{padding-right:0}}
@media (max-width:900px){
  .desktop-header,.channel-bar{display:none}.mobile-header{display:grid;grid-template-columns:72px minmax(0,1fr) 96px;align-items:center;gap:8px;min-height:66px;padding:0 14px}.mobile-logo{justify-self:center;min-width:0}.mobile-logo img{height:36px;max-width:148px}.mobile-logo .logo-placeholder{min-width:118px;height:36px;font-size:14px}.menu-toggle{justify-self:start;width:44px;height:44px;border:0;border-radius:12px;background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;box-shadow:0 8px 20px rgba(89,126,247,.08)}.menu-toggle span{display:block;width:20px;height:2px;background:#1D2B5F;border-radius:2px}.mobile-register{justify-self:end;display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 12px;border-radius:999px;background:linear-gradient(135deg,#7580EE,#597EF7,#7AC4F5);color:#fff;font-weight:800;font-size:13px;white-space:nowrap;box-shadow:0 8px 20px rgba(89,126,247,.22)}
  .mobile-drawer{display:block;position:fixed;left:0;top:0;bottom:0;width:min(84vw,320px);background:#fff;z-index:12000;transform:translateX(-105%);transition:transform .26s ease;box-shadow:18px 0 50px rgba(29,43,95,.16)}.mobile-drawer.is-open{transform:translateX(0)}.drawer-overlay{display:block;position:fixed;inset:0;background:rgba(29,43,95,.32);z-index:11990;opacity:0;visibility:hidden;transition:.22s}.drawer-overlay.is-open{opacity:1;visibility:visible}.drawer-head{height:70px;padding:0 14px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #edf1f8}.drawer-logo img{height:34px;max-width:150px}.drawer-close{border:0;background:#F0F4FF;color:#1D2B5F;width:40px;height:40px;border-radius:12px;font-size:28px;line-height:1}.drawer-scroll{height:calc(100% - 70px);overflow-y:auto;padding:14px 14px 30px}.drawer-scroll section{margin-bottom:18px}.drawer-scroll h2{font-size:14px;color:#74809b;margin:0 0 6px;padding:0 8px}.drawer-scroll a{display:block;color:#26385f;font-weight:700;padding:9px 8px;border-radius:9px}.drawer-scroll a:hover{background:#F4F7FF;color:#597EF7}.drawer-open{overflow:hidden}
  .noscript-mobile-nav{display:flex;overflow-x:auto;gap:8px;padding:10px 14px;background:#fff;border-bottom:1px solid #eef1f8}.noscript-mobile-nav a{flex:0 0 auto;padding:7px 10px;border-radius:999px;background:#F2F6FF;color:#34466d;font-weight:700;font-size:13px}
  .hero,.hero.compact{padding:40px 0 18px}.hero-grid,.content-pair,.app-banner{grid-template-columns:1fr}.content-pair.reverse .pair-copy,.content-pair.reverse .pair-media{order:initial}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-brand{grid-column:1/-1}.index-carousel{height:280px}.section{padding:46px 0}.media.feature-media{height:230px}.site-footer{margin-bottom:64px}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:8000;height:64px;padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid #e9edf7;box-shadow:0 -8px 24px rgba(89,126,247,.08)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;color:#3d4e74;font-size:13px;font-weight:800}.footer-bottom{flex-direction:column}.footer-bottom p:last-child{white-space:nowrap}}
@media (max-width:600px){
  .shell,.reading{width:min(100% - 28px,1200px)}h1{font-size:clamp(28px,9vw,34px)}h2{font-size:24px}p,.article p{font-size:16px}.lead{font-size:17px}.section{padding:40px 0}.grid-2,.grid-3{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.card{padding:19px}.topic-matrix .card{padding:14px}.topic-matrix h3{font-size:16px}.topic-matrix p{font-size:14px}.index-carousel{height:210px;border-radius:16px}.carousel-slide{padding:10px}.carousel-control{width:36px;height:36px;font-size:20px}.carousel-control.prev{left:8px}.carousel-control.next{right:8px}.media.card-media{height:164px}.media.feature-media{height:220px}.reading-index,.compare{grid-template-columns:1fr}.notice-strip{flex-direction:column}.notice-strip strong{white-space:normal}.footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}.footer-grid,.footer-bottom{width:min(100% - 28px,1200px)}.mobile-header{grid-template-columns:64px minmax(0,1fr) 92px;padding:0 10px}.mobile-register{font-size:12px;padding:0 10px}.mobile-logo img{max-width:138px}}
@media (max-width:390px){.mobile-header{grid-template-columns:58px minmax(0,1fr) 86px;gap:4px}.menu-toggle{width:42px}.mobile-register{height:38px;padding:0 9px}.mobile-logo img{max-width:126px}.mobile-logo .logo-placeholder{min-width:104px;font-size:13px}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}