:root{--page:#F6F8FF;--soft:#ECF0FF;--sky:#EAF7FF;--card:#FFFFFF;--title:#1D2B5F;--text:#222222;--muted:#5B647A;--brand:#597EF7;--foot:#1F1F1F;--foottext:#D7DCE8;--line:rgba(89,126,247,.16);--shadow:0 16px 40px rgba(89,126,247,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:var(--page);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8;overflow-x:hidden}img,svg,video,canvas{max-width:100%}a{color:var(--brand)}button,input,select,textarea{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;text-decoration:none}.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain}.logo-placeholder{display:inline-flex;height:40px;min-width:124px;align-items:center;justify-content:center;border-radius:12px;background:#fff;color:var(--title);font-weight:800;letter-spacing:.08em}.nav-core{display:flex;align-items:center;gap:8px;white-space:nowrap;flex-wrap:nowrap;min-width:0}.nav-core a{color:#1D2B5F;padding:8px 10px;border-radius:999px;font-weight:700;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:8px;flex:0 0 auto}.header-login{font-weight:700;color:var(--title);text-decoration:none;padding:8px 10px}.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);border:0}.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-register,.menu-toggle{display:none}.channel-bar{background:#fff;border-top:1px solid rgba(89,126,247,.08)}.channel-inner{max-width:1200px;margin:0 auto;padding:8px 20px;display:flex;gap:18px;overflow-x:auto;overscroll-behavior-inline:contain;scrollbar-width:thin;white-space:nowrap}.channel-inner a{color:#5B647A;text-decoration:none;font-size:14px;font-weight:700}.channel-inner a:hover{color:#597EF7}.site-main{min-height:60vh;padding-right:76px}.container{width:min(1200px,calc(100% - 40px));margin:0 auto}.reading{width:min(860px,calc(100% - 40px));margin:0 auto}.page-hero{padding:72px 0 46px}.page-hero.compact{padding-bottom:24px}.eyebrow{margin:0 0 10px;color:var(--brand);font-weight:800;letter-spacing:.08em}.page-hero h1,.home-lead h1{margin:0;color:var(--title);font-size:clamp(38px,5vw,50px);line-height:1.18;letter-spacing:-.02em}.lead{margin:20px 0 0;color:var(--muted);font-size:18px;line-height:1.85;max-width:820px}.section{padding:64px 0}.section-tight{padding:42px 0}.section-title{margin:0 0 12px;color:var(--title);font-size:30px;line-height:1.3}.section-intro{margin:0 0 28px;color:var(--muted);font-size:17px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow)}.card h2,.card h3{color:var(--title);margin-top:0}.card p:last-child{margin-bottom:0}.grid-2,.grid-3,.grid-4{display:grid;gap:20px}.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))}.text-link{display:inline-flex;align-items:center;gap:6px;font-weight:800;text-decoration:none}.text-link::after{content:"→"}.pill-row{display:flex;gap:10px;overflow-x:auto;padding:2px 0 8px;white-space:nowrap}.pill-row a{flex:0 0 auto;padding:9px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--title);font-weight:700;text-decoration:none}.notice-strip{background:#fff;border-left:4px solid var(--brand);border-radius:16px;padding:20px 22px;color:#36405a;box-shadow:var(--shadow)}.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:244px;aspect-ratio:auto}.media-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#ECF0FF,#EAF7FF);color:#8290b5;font-weight:700}.split{display:grid;grid-template-columns:1.08fr .92fr;gap:30px;align-items:center}.split.reverse{grid-template-columns:.92fr 1.08fr}.split.reverse .split-media{order:2}.split.reverse .split-copy{order:1}.split-copy h2{font-size:30px;line-height:1.35;color:var(--title);margin:0 0 14px}.article h2{margin:36px 0 12px;color:var(--title);font-size:26px;line-height:1.4}.article h3{margin:28px 0 10px;color:var(--title);font-size:21px}.article p,.article li{font-size:17px;line-height:1.88}.article ul,.article ol{padding-left:1.4em}.article .callout{margin:28px 0;padding:20px 22px;border-radius:16px;background:#fff;border:1px solid var(--line)}.toc{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:22px 0}.toc a{background:#fff;border:1px solid var(--line);padding:12px 14px;border-radius:12px;text-decoration:none;color:var(--title);font-weight:700}.steps{counter-reset:step;display:grid;gap:14px;margin:24px 0}.step{position:relative;padding:20px 22px 20px 66px;background:#fff;border:1px solid var(--line);border-radius:16px}.step::before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:20px;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--brand);font-weight:800}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 22px}.faq-item h2,.faq-item h3{margin:0 0 8px;color:var(--title)}.topic-index{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.topic-index a{display:block;text-decoration:none;color:var(--title);background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;min-height:112px}.topic-index strong{display:block;margin-bottom:6px}.topic-index span{color:var(--muted);font-size:14px}.home-lead{padding:58px 0 28px}.home-lead .lead-row{display:flex;justify-content:space-between;align-items:flex-end;gap:24px}.hero-carousel{position:relative;background:#101827;border-radius:18px;overflow:hidden;min-height:360px}.hero-slide{padding:18px;min-height:360px}.hero-slide .media{height:324px;background:#101827}.hero-carousel.js-ready .hero-slide{display:none}.hero-carousel.js-ready .hero-slide.is-active{display:block}.hero-controls{position:absolute;inset:auto 18px 18px 18px;display:flex;justify-content:space-between;align-items:center;pointer-events:none}.hero-arrow,.hero-dot{pointer-events:auto;border:0;cursor:pointer}.hero-arrow{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.92);color:var(--title);font-size:22px}.hero-dots{display:flex;gap:8px}.hero-dot{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.45);padding:0}.hero-dot.is-active{background:#fff;transform:scale(1.2)}.app-banner{display:grid;grid-template-columns:1.2fr .8fr;gap:26px;align-items:center;background:linear-gradient(135deg,#fff,#eaf7ff);border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:var(--shadow)}.app-banner h2{margin:0 0 12px;color:var(--title)}.safety-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.side-float{position:fixed;right:14px;top:38%;z-index:8000;width:112px;display:flex;flex-direction:column;gap:8px}.side-float>a,.side-float>button{background:#fff;color:var(--brand);border:1px solid var(--line);border-radius:12px;min-height:42px;display:flex;align-items:center;justify-content:center;text-decoration:none;font-weight:700;padding:8px}.side-float>.main-btn{color:#fff;border:0}.side-float button{cursor:pointer}.site-footer{background:#1F1F1F;color:#D7DCE8;margin-top:64px}.footer-grid{width:min(1200px,calc(100% - 40px));margin:0 auto;padding:54px 0 38px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:34px}.site-footer h2{font-size:16px;color:#fff;margin:0 0 14px}.site-footer a:not(.site-logo){display:block;color:#D7DCE8;text-decoration:none;margin:7px 0}.footer-brand p{max-width:330px}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 20px;text-align:center;font-size:14px}.mobile-bottom{display:none}.mobile-drawer{position:fixed;left:0;top:0;bottom:0;width:min(84vw,320px);background:#fff;z-index:12000;transform:translateX(-104%);transition:transform .25s ease;box-shadow:16px 0 40px rgba(29,43,95,.2)}.mobile-drawer.is-open{transform:translateX(0)}.drawer-mask{position:fixed;inset:0;background:rgba(16,24,39,.46);z-index:11000}.drawer-head{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line)}.drawer-close{border:0;background:var(--soft);color:var(--title);width:38px;height:38px;border-radius:50%;font-size:26px}.drawer-scroll{height:calc(100% - 72px);overflow-y:auto;padding:8px 18px 30px}.drawer-scroll section{padding:13px 0;border-bottom:1px solid #edf0f8}.drawer-scroll h2{font-size:13px;color:#8790a8;margin:0 0 8px}.drawer-scroll a{display:block;color:var(--title);text-decoration:none;padding:7px 0;font-weight:700}.drawer-open{overflow:hidden}
@media(max-width:1120px){.nav-core{gap:2px}.nav-core a{padding:8px 7px;font-size:14px}.header-actions .header-login{display:none}.side-float{display:none}.topic-index{grid-template-columns:repeat(3,minmax(0,1fr))}.site-main{padding-right:0}}
@media(max-width:860px){.header-inner{min-height:64px;padding:0 14px;display:grid;grid-template-columns:92px minmax(0,1fr) 112px;gap:8px}.nav-core,.header-actions,.channel-bar{display:none}.menu-toggle{display:flex;width:44px;height:40px;border:0;background:transparent;flex-direction:column;justify-content:center;gap:5px;padding:8px}.menu-toggle span{width:24px;height:2px;background:var(--title);border-radius:2px}.header-inner>.site-logo{justify-self:center}.header-inner>.site-logo img{height:34px;max-width:142px}.mobile-register{display:inline-flex;justify-self:end;min-width:104px;height:40px;padding:0 14px;font-size:14px}.container,.reading{width:min(100% - 28px,1200px)}.page-hero{padding:48px 0 28px}.page-hero h1,.home-lead h1{font-size:clamp(28px,8vw,34px)}.lead{font-size:16px}.section{padding:48px 0}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.split,.split.reverse{grid-template-columns:1fr}.split.reverse .split-media,.split.reverse .split-copy{order:initial}.topic-index{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-carousel{min-height:260px}.hero-slide{min-height:260px;padding:14px}.hero-slide .media{height:232px}.home-lead .lead-row{display:block}.home-lead .main-btn{margin-top:18px}.app-banner{grid-template-columns:1fr}.safety-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:9000;height:58px;background:#fff;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;text-decoration:none;color:var(--title);font-size:14px;font-weight:700}.site-footer{padding-bottom:58px}.media.feature-media{height:220px}}
@media(max-width:560px){.header-inner{grid-template-columns:72px minmax(0,1fr) 100px}.mobile-register{min-width:92px;padding:0 10px}.header-inner>.site-logo img{max-width:128px}.page-hero{padding-top:40px}.grid-2,.grid-3{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.topic-index{gap:12px}.topic-index a{padding:15px;min-height:104px}.card{padding:20px}.section-title{font-size:26px}.article h2{font-size:23px}.article p,.article li{font-size:16px}.toc{grid-template-columns:1fr}.hero-carousel{min-height:212px}.hero-slide{min-height:212px;padding:10px}.hero-slide .media{height:192px}.hero-controls{inset:auto 10px 10px 10px}.hero-arrow{width:34px;height:34px}.footer-grid{grid-template-columns:1fr;gap:20px;padding-top:42px}.media.card-media{height:160px}.media.feature-media{height:220px}}

.channel-inner a.is-current{color:#597EF7;background:#F6F8FF}.noscript-nav{display:none}
@media(max-width:860px){.noscript-nav{display:flex;gap:8px;overflow-x:auto;white-space:nowrap;padding:10px 14px;background:#fff;border-bottom:1px solid rgba(89,126,247,.16)}.noscript-nav a{flex:0 0 auto;text-decoration:none;color:#1D2B5F;background:#F6F8FF;border-radius:999px;padding:7px 11px;font-weight:700}}

.toc span{background:#fff;border:1px solid var(--line);padding:12px 14px;border-radius:12px;color:var(--title);font-weight:700}

.channel-inner a.is-current{color:#597EF7;background:#F6F8FF}.noscript-nav{display:none}
@media(max-width:860px){.noscript-nav{display:flex;gap:8px;overflow-x:auto;white-space:nowrap;padding:10px 14px;background:#fff;border-bottom:1px solid rgba(89,126,247,.16)}.noscript-nav a{flex:0 0 auto;text-decoration:none;color:#1D2B5F;background:#F6F8FF;border-radius:999px;padding:7px 11px;font-weight:700}}