:root{--page:#EAF2FB;--surface:#FFFFFF;--strip:#F4F8FF;--media:#EDF5FF;--blue:#137CD8;--blue2:#2FA8F7;--cyan:#45C7FF;--text:#24364F;--muted:#5D718A;--footer:#102B46;--foottext:#EAF6FF;--line:rgba(47,168,247,.14);--shadow:0 12px 26px rgba(19,124,216,.12)}
*{box-sizing:border-box;max-width:100%}html{scroll-behavior:smooth}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}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button,a{touch-action:manipulation}img{max-width:100%}
.site-header{position:sticky;top:0;z-index:9000;width:100%;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);box-shadow:0 6px 18px rgba(19,124,216,.08)}
.header-inner{max-width:1140px;min-height:66px;margin:0 auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}.site-logo{display:flex;align-items:center;min-width:150px}.site-logo img{display:block;height:38px;width:auto;max-width:156px;object-fit:contain}.logo-fallback{font-size:22px;font-weight:800;color:var(--blue);letter-spacing:.04em;white-space:nowrap}.nav-core{display:flex;align-items:center;justify-content:center;gap:2px;min-width:0}.nav-core a{color:var(--text);padding:8px 11px;font-weight:700;text-decoration:none;white-space:nowrap}.nav-core a.is-current,.nav-core a:hover{color:var(--blue);box-shadow:inset 0 -2px 0 var(--blue2)}
.main-btn{display:inline-flex;align-items:center;justify-content:center;height:40px;min-width:92px;padding:0 18px;background:linear-gradient(135deg,#45C7FF 0%,#2FA8F7 48%,#137CD8 100%);color:#fff;border-radius:999px;text-decoration:none;font-weight:700;box-shadow:0 10px 22px rgba(19,124,216,.18);touch-action:manipulation}.main-btn:hover{color:#fff;text-decoration:none;filter:brightness(.98)}.header-action{flex:0 0 auto}.menu-toggle{display:none;border:0;background:transparent;color:var(--blue);font-weight:800;min-height:40px;padding:0 6px;font-size:15px}.channel-strip{background:var(--strip);border-bottom:1px solid var(--line)}.channel-inner{max-width:1140px;margin:0 auto;padding:7px 16px;display:flex;gap:18px;overflow-x:auto;scrollbar-width:thin}.channel-inner a{flex:0 0 auto;color:var(--muted);font-size:14px;white-space:nowrap}.channel-inner a:hover{color:var(--blue);text-decoration:none}
.mobile-drawer,.drawer-mask{display:none}.drawer-open{overflow:hidden}.site-main{min-height:60vh;padding-bottom:28px}.page-wrap{max-width:1140px;margin:0 auto;padding:34px 16px 20px}.reading{max-width:800px;margin-left:auto;margin-right:auto}.breadcrumb{font-size:14px;color:var(--muted);margin:0 0 14px}.breadcrumb a{color:var(--muted)}h1,h2,h3{color:var(--blue);line-height:1.28;margin-top:0}h1{font-size:clamp(28px,4vw,40px);letter-spacing:-.02em;margin-bottom:16px}h2{font-size:clamp(22px,3vw,28px);margin-bottom:12px}h3{font-size:19px}p{margin:0 0 16px}.lead{font-size:18px;color:#334D6A}.section{margin:38px 0}.surface{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:26px}.soft{background:var(--strip);border:1px solid var(--line);border-radius:16px;padding:24px}.notice-box{border-left:4px solid var(--blue2);background:#fff;padding:18px 20px;border-radius:0 14px 14px 0}.link-row{display:flex;flex-wrap:wrap;gap:10px 14px;margin-top:18px}.link-row a{font-weight:700}.clean-list{padding-left:1.2em;margin:12px 0}.clean-list li{margin:8px 0}.step-list{counter-reset:step;list-style:none;padding:0;margin:0;display:grid;gap:12px}.step-list li{counter-increment:step;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px 14px 52px;position:relative}.step-list li:before{content:counter(step);position:absolute;left:14px;top:14px;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:800;line-height:1}.mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.mini-grid a,.mini-grid article{display:block;background:#fff;border:1px solid var(--line);border-radius:15px;padding:20px;color:var(--text);box-shadow:0 8px 20px rgba(19,124,216,.07)}.mini-grid a:hover{text-decoration:none;transform:translateY(-1px)}.mini-grid strong{display:block;color:var(--blue);font-size:18px;margin-bottom:5px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center}.two-col.text-heavy{grid-template-columns:.85fr 1.15fr}.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:14px;background:var(--media);aspect-ratio:16/9}.media>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center center;display:block}.media-placeholder{position:absolute;inset:0;background:linear-gradient(135deg,#EDF5FF,#DDEEFF);display:grid;place-items:center}.media-placeholder:after{content:"图片暂未加载";color:#6B86A3;font-size:14px}.media.card-media{min-height:148px}.media.feature-media{min-height:190px}.tagline{background:var(--strip);border:1px solid var(--line);border-radius:16px;padding:22px 24px;color:#405B77}.content-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.topic-index{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.topic-index a{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;font-weight:800}.topic-index a:hover{text-decoration:none}.app-strip{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 24px}.app-strip p{margin:0}.article-meta{font-size:14px;color:var(--muted);margin-bottom:18px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px 18px;margin:12px 0}.faq-list summary{font-weight:800;color:var(--blue);cursor:pointer}.faq-static{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.faq-item h2{font-size:20px;margin-bottom:8px}
.carousel{max-width:1140px;margin:28px auto 0;padding:0 16px;position:relative;z-index:1}.carousel-shell{position:relative;background:#fff;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);height:clamp(240px,25vw,320px)}.slide{position:absolute;inset:0;opacity:0;pointer-events:none;transition:opacity .35s ease;display:grid;place-items:center;background:#fff}.slide.is-active{opacity:1;pointer-events:auto}.slide img{width:100%;height:100%;object-fit:contain;display:block}.slide .media-placeholder{position:absolute}.carousel-prev,.carousel-next{position:absolute;top:50%;transform:translateY(-50%);z-index:2;width:42px;height:42px;border-radius:50%;border:1px solid rgba(19,124,216,.18);background:rgba(255,255,255,.88);color:var(--blue);font-size:23px;font-weight:800;cursor:pointer}.carousel-prev{left:14px}.carousel-next{right:14px}.carousel-dots{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);z-index:2;display:flex;gap:8px}.carousel-dot{width:10px;height:10px;padding:0;border:0;border-radius:50%;background:#A8C7E5;cursor:pointer}.carousel-dot.is-active{background:var(--blue)}
.site-footer{background:var(--footer);color:var(--foottext);padding:44px 16px 22px;margin-top:34px}.footer-grid{max-width:1140px;margin:0 auto;display:grid;grid-template-columns:1.45fr 1fr 1fr 1fr;gap:28px}.site-footer h2{color:#fff;font-size:17px;margin:0 0 10px}.site-footer a{display:block;color:var(--foottext);margin:5px 0}.footer-brand p{color:#CFE3F6;max-width:390px}.footer-logo{display:inline-flex;align-items:center;margin-bottom:12px}.footer-logo img{height:38px;width:auto;object-fit:contain}.footer-fallback{color:#fff}.footer-bottom{max-width:1140px;margin:28px auto 0;padding-top:18px;border-top:1px solid rgba(234,246,255,.16);font-size:13px;color:#CFE3F6;display:flex;justify-content:space-between;gap:20px}.footer-bottom p{margin:0}.floating-actions{position:fixed;right:12px;top:48%;transform:translateY(-50%);z-index:8000;display:grid;gap:7px;width:96px}.floating-actions a,.floating-actions button{background:#fff;color:var(--blue);border:1px solid var(--line);border-radius:12px;min-height:40px;padding:8px;text-align:center;font:inherit;font-size:13px;cursor:pointer;box-shadow:0 8px 18px rgba(19,124,216,.08)}.floating-actions .float-primary{background:linear-gradient(135deg,#45C7FF,#137CD8);color:#fff}.mobile-bottom{display:none}
@media(max-width:1100px){.nav-core a{padding:8px 7px}.header-inner{gap:8px}.floating-actions{display:none}.site-main{padding-right:0}}
@media(max-width:980px){
  .site-header{position:sticky}.header-inner{min-height:62px;padding:0 12px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.menu-toggle{display:inline-flex;justify-self:start;align-items:center}.site-logo{justify-self:center;min-width:0}.site-logo img{height:34px;max-width:132px}.logo-fallback{font-size:19px}.header-action{justify-self:end;min-width:82px;padding:0 13px;height:40px}.nav-core,.channel-strip{display:none}.site-main{padding-bottom:74px}.page-wrap{padding-top:26px}.two-col,.two-col.text-heavy{grid-template-columns:1fr}.mini-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{display:block}.footer-bottom p+p{margin-top:8px}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:8500;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid rgba(47,168,247,.2);padding:max(7px,env(safe-area-inset-bottom)) 8px 7px}.mobile-bottom a{text-align:center;min-height:42px;display:grid;place-items:center;font-weight:700;color:var(--text)}
  .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;padding-bottom:24px}.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}.drawer-top{min-height:66px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.drawer-logo img{height:34px;width:auto;object-fit:contain}.drawer-close{border:1px solid var(--line);background:#fff;color:var(--blue);border-radius:10px;min-height:40px;padding:0 12px}.drawer-group{padding:14px;border-bottom:1px solid #EDF2F7}.drawer-group strong{display:block;color:var(--muted);font-size:13px;margin-bottom:6px}.drawer-group a{display:block;color:var(--text);font-weight:700;padding:7px 0;min-height:40px}.carousel-shell{height:clamp(200px,44vw,260px)}
}
@media(max-width:620px){body{line-height:1.75}.page-wrap{padding:24px 13px 16px}.surface,.soft{padding:20px 17px}.mini-grid{grid-template-columns:repeat(2,1fr);gap:10px}.mini-grid a,.mini-grid article{padding:15px 13px}.mini-grid strong{font-size:16px}.topic-index{grid-template-columns:1fr}.app-strip{grid-template-columns:1fr}.carousel{margin-top:18px;padding:0 10px}.carousel-shell{height:clamp(140px,42vw,180px);border-radius:14px}.carousel-prev,.carousel-next{width:38px;height:38px}.carousel-prev{left:8px}.carousel-next{right:8px}.section{margin:30px 0}.footer-grid{grid-template-columns:1fr}.footer-grid section:not(.footer-brand){padding-top:8px;border-top:1px solid rgba(234,246,255,.1)}}

/* v2 content patterns */
.hero-copy{max-width:860px;margin:32px auto 12px;text-align:center}.hero-copy p{max-width:760px;margin-left:auto;margin-right:auto}.section-kicker{display:inline-flex;align-items:center;min-height:30px;padding:2px 11px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--blue);font-size:13px;font-weight:800;margin-bottom:12px}.guide-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}.guide-list{display:grid;gap:10px}.guide-list a{display:flex;justify-content:space-between;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px 17px;color:var(--text);font-weight:700}.guide-list a span{color:var(--muted);font-size:13px;font-weight:400}.feature-stack{display:grid;gap:16px}.feature-stack .surface{box-shadow:none}.three-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.three-notes article{background:#fff;border:1px solid var(--line);border-radius:15px;padding:20px}.three-notes h2{font-size:20px}.ribbon{display:flex;flex-wrap:wrap;gap:9px;padding:14px 0}.ribbon a{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-weight:700}.split-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.split-list .surface{padding:20px}.reading-wide{max-width:920px;margin-left:auto;margin-right:auto}.compact-note{font-size:14px;color:var(--muted)}
@media(max-width:800px){.guide-grid,.three-notes,.split-list{grid-template-columns:1fr}.hero-copy{text-align:left}.guide-list a{align-items:flex-start;flex-direction:column;gap:2px}}