:root{--bg:#F4FBFF;--paper:#FFFFFF;--soft:#EAF7FF;--blue:#1CA8F6;--bright:#38C7FF;--deep:#0877C9;--ink:#223044;--nav:#1D2A3A;--muted:#5F7082;--note:#7A8A9A;--footer:#082A46;--footerText:#EAF8FF;--line:rgba(28,168,246,.12);--shadow:0 16px 40px rgba(8,119,201,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8;overflow-x:hidden}img,svg{max-width:100%}a{color:var(--deep);text-decoration:none}a:hover{text-decoration:none;color:#045f9f}button,input{font:inherit}.site-main{min-height:60vh}.container{width:min(1180px,calc(100% - 36px));margin:0 auto}.reading{width:min(820px,calc(100% - 36px));margin:0 auto}.section{padding:58px 0}.section.tight{padding:38px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:24px}.section-head p{max-width:620px;margin:0;color:var(--muted)}.kicker{display:inline-flex;align-items:center;gap:8px;color:var(--deep);font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.kicker:before{content:"";width:26px;height:3px;border-radius:99px;background:linear-gradient(90deg,var(--bright),var(--deep))}h1,h2,h3{color:var(--nav);line-height:1.28;margin-top:0}h1{font-size:clamp(30px,4vw,46px);letter-spacing:-.02em;margin-bottom:18px}h2{font-size:clamp(23px,2.7vw,32px);margin-bottom:12px}h3{font-size:19px;margin-bottom:8px}p{margin:0 0 16px}.lead{font-size:18px;color:#31465d}.muted{color:var(--muted)}
.site-header{position:sticky;top:0;z-index:9999;width:100%;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);box-shadow:0 8px 24px rgba(8,119,201,.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{flex:0 0 auto;display:block}.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain}.logo-placeholder{display:block;width:154px;height:40px;border-radius:10px;background:linear-gradient(135deg,#dff5ff,#f8fdff);border:1px solid var(--line)}.nav-core{display:flex;align-items:center;justify-content:center;gap:4px;min-width:0}.nav-core a{color:#1D2A3A;padding:8px 11px;font-weight:700;text-decoration:none;white-space:nowrap;border-bottom:2px solid transparent}.nav-core a.is-current,.nav-core a:hover{color:#0877C9;border-bottom-color:#1CA8F6}.main-btn{display:inline-flex;align-items:center;justify-content:center;height:42px;min-width:96px;padding:0 20px;background:linear-gradient(135deg,#38C7FF 0%,#1CA8F6 48%,#0877C9 100%);color:#fff!important;border-radius:999px;text-decoration:none;font-weight:700;box-shadow:0 12px 26px rgba(8,119,201,.18)}.menu-toggle{display:none;width:42px;height:42px;border:0;background:#fff;border-radius:12px;padding:10px;box-shadow:0 8px 22px rgba(8,119,201,.08)}.menu-toggle span{display:block;height:2px;background:var(--deep);margin:4px 0;border-radius:3px}.channel-bar{background:#EAF7FF;border-bottom:1px solid rgba(28,168,246,.08)}.channel-inner{max-width:1180px;margin:0 auto;padding:0 18px;display:flex;align-items:center;gap:5px;overflow-x:auto;scrollbar-width:none}.channel-inner::-webkit-scrollbar{display:none}.channel-inner a{flex:0 0 auto;padding:9px 10px;color:#5F7082;font-size:14px;white-space:nowrap}.channel-inner a.is-current,.channel-inner a:hover{color:#0877C9;font-weight:700}.mobile-drawer,.drawer-mask{display:none}
.hero-slider{position:relative;width:min(1180px,calc(100% - 36px));height:340px;margin:28px auto 0;border-radius:18px;overflow:hidden;background:#fff;box-shadow:var(--shadow)}.slides,.slide{position:absolute;inset:0}.slide{opacity:0;pointer-events:none;transition:opacity .35s ease;display:flex;align-items:center;justify-content:center}.slide.is-active{opacity:1;pointer-events:auto}.slide img{width:100%;height:100%;object-fit:contain;display:block}.media-placeholder{display:block;width:100%;height:100%;background:linear-gradient(135deg,#EAF7FF,#f9fdff)}.slider-prev,.slider-next{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:42px;height:42px;border:0;border-radius:50%;background:rgba(255,255,255,.92);color:var(--deep);font-size:28px;box-shadow:0 8px 22px rgba(8,119,201,.12);cursor:pointer}.slider-prev{left:16px}.slider-next{right:16px}.slider-dots{position:absolute;left:50%;bottom:14px;transform:translateX(-50%);display:flex;gap:8px;z-index:5}.slider-dot{width:8px;height:8px;padding:0;border:0;border-radius:50%;background:#b8dff6;cursor:pointer}.slider-dot.is-active{width:24px;border-radius:99px;background:var(--deep)}
.panorama{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,.65fr);gap:22px;align-items:stretch}.panorama-main{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;box-shadow:var(--shadow);display:flex;flex-direction:column;justify-content:space-between}.path-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.path-row a,.topic-strip a,.tag-link{display:inline-flex;align-items:center;min-height:38px;padding:7px 14px;border-radius:999px;background:var(--soft);border:1px solid var(--line);color:var(--deep);font-weight:700}.panorama-side{display:grid;grid-template-columns:1fr 1fr;gap:14px}.mini-panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;min-height:154px}.mini-panel strong{display:block;color:var(--deep);font-size:13px;margin-bottom:9px}.mini-panel h2{font-size:20px}.mini-panel p{font-size:14px;color:var(--muted);margin-bottom:9px}.topic-strip{display:flex;gap:10px;overflow-x:auto;padding:3px 0 10px;scrollbar-width:thin}.topic-strip a{flex:0 0 auto;background:#fff}.mosaic{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px}.mosaic article{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px}.mosaic article:first-child{grid-row:span 2}.mosaic .wide-note{grid-column:span 2}.reading-boundary{background:#fff;border-left:4px solid var(--blue);border-radius:0 16px 16px 0;padding:24px 26px;box-shadow:var(--shadow);font-size:17px}.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:14px;background:#EAF7FF;aspect-ratio:16/9}.media>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center center;display:block}.feature-media{min-height:220px}.compact-media{min-height:160px}
.page-hero{padding:52px 0 24px}.page-hero .container{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:30px;align-items:center}.page-hero.no-media .container{grid-template-columns:1fr}.page-hero-copy{max-width:760px}.page-hero p{font-size:18px;color:var(--muted)}.crumbs{display:flex;gap:9px;flex-wrap:wrap;font-size:13px;color:var(--note);margin-bottom:16px}.crumbs a{color:var(--deep)}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:26px;align-items:start}.article-body{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;box-shadow:var(--shadow)}.article-body p{font-size:17px}.article-body ul,.article-body ol{padding-left:22px;margin:0 0 20px}.article-body li{margin-bottom:9px}.aside-nav{position:sticky;top:132px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.aside-nav h2{font-size:18px}.aside-nav a{display:block;padding:9px 0;border-bottom:1px solid #edf7fc}.aside-nav a:last-child{border-bottom:0}.directory{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.directory a,.info-tile{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;min-height:110px}.directory strong{display:block;color:var(--nav);margin-bottom:5px}.directory span{font-size:14px;color:var(--muted)}.steps{counter-reset:step;display:grid;gap:14px}.step{counter-increment:step;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 22px 20px 72px;position:relative}.step:before{content:counter(step);position:absolute;left:20px;top:20px;width:36px;height:36px;border-radius:50%;background:var(--soft);color:var(--deep);font-weight:800;display:grid;place-items:center}.compare{display:grid;grid-template-columns:1fr 1fr;gap:18px}.compare>article{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px}.question-pair{display:grid;grid-template-columns:1fr 1fr;gap:18px}.question-box{background:#fff;border-top:4px solid var(--blue);border-radius:16px;padding:24px;box-shadow:var(--shadow)}.related-links{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.related-links a{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;font-weight:700}.notice-line{padding:18px 20px;background:#EAF7FF;border-radius:14px;color:#39566e}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px}.faq-item h2{font-size:20px;margin-bottom:8px}
.desktop-float{position:fixed;right:14px;top:32%;z-index:9000;display:flex;flex-direction:column;gap:8px;width:112px}.desktop-float>a,.desktop-float>button{display:flex;align-items:center;justify-content:center;min-height:40px;border:1px solid var(--line);background:#fff;color:var(--deep);border-radius:12px;box-shadow:0 8px 24px rgba(8,119,201,.08);font-weight:700;font-size:13px}.desktop-float .main-btn{border:0}.back-top{cursor:pointer}.site-footer{background:#082A46;color:#EAF8FF;margin-top:44px}.footer-grid{width:min(1180px,calc(100% - 36px));margin:0 auto;padding:52px 0 32px;display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:28px}.footer-grid h2{color:#fff;font-size:17px}.footer-grid a{display:block;color:#d8f2ff;padding:4px 0}.footer-grid p{color:#cbe8f7}.footer-logo img{height:40px;width:auto;max-width:168px;object-fit:contain}.footer-bottom{border-top:1px solid rgba(234,248,255,.14);width:min(1180px,calc(100% - 36px));margin:0 auto;padding:18px 0 28px;display:flex;justify-content:space-between;gap:24px;font-size:13px;color:#bdddeb}.footer-bottom p{margin:0}.mobile-bottom{display:none}
@media(max-width:1280px){.desktop-float{display:none}}
@media(max-width:980px){.channel-bar,.nav-core{display:none}.header-inner{min-height:64px;padding:0 14px}.menu-toggle{display:block;flex:0 0 42px}.site-logo{position:absolute;left:50%;transform:translateX(-50%)}.site-logo img{height:36px;max-width:150px}.header-action{height:40px;min-width:82px;padding:0 14px}.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(8,119,201,.16);overflow-y:auto}.mobile-drawer.is-open{transform:translateX(0)}.drawer-mask{display:none;position:fixed;inset:0;background:rgba(8,42,70,.42);z-index:11000;opacity:0;pointer-events:none;transition:opacity .18s ease}.drawer-mask.is-visible{display:block;opacity:1;pointer-events:auto}.drawer-open{overflow:hidden}.drawer-top{position:sticky;top:0;background:#fff;display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--line);z-index:2}.drawer-logo img{display:block;height:36px;width:auto;max-width:150px;object-fit:contain}.drawer-close{width:40px;height:40px;border:0;border-radius:12px;background:var(--soft);color:var(--deep);font-size:28px}.drawer-body{padding:8px 18px 90px}.drawer-body section{padding:14px 0;border-bottom:1px solid #edf7fc}.drawer-body h2{font-size:14px;color:var(--note);margin:0 0 7px}.drawer-body a{display:block;padding:8px 2px;color:var(--nav);font-weight:650}.hero-slider{height:270px}.panorama{grid-template-columns:1fr}.mosaic{grid-template-columns:1fr 1fr}.mosaic article:first-child{grid-row:auto}.page-hero .container{grid-template-columns:1fr}.page-hero .media{max-width:620px}.article-grid{grid-template-columns:1fr}.aside-nav{position:static}.directory{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:10000;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(8,119,201,.08);padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{min-height:54px;display:grid;place-items:center;color:var(--nav);font-size:13px;font-weight:700}body{padding-bottom:54px}}
@media(max-width:640px){.container,.reading,.hero-slider{width:min(100% - 28px,1180px)}.section{padding:38px 0}.section.tight{padding:28px 0}.hero-slider{height:185px;margin-top:18px;border-radius:14px}.slider-prev,.slider-next{width:34px;height:34px;font-size:22px}.panorama-main{padding:24px}.panorama-side{grid-template-columns:1fr 1fr}.mini-panel{min-height:142px;padding:17px}.mosaic{grid-template-columns:1fr}.mosaic .wide-note{grid-column:auto}.page-hero{padding:36px 0 14px}.page-hero p,.lead,.article-body p{font-size:16px}.article-body{padding:22px}.directory,.compare,.question-pair,.related-links{grid-template-columns:1fr}.step{padding-left:66px}.footer-grid{grid-template-columns:1fr;padding-top:38px}.footer-bottom{display:block}.footer-bottom p+p{margin-top:10px}.feature-media{min-height:190px}.header-action{font-size:14px;min-width:76px}.logo-placeholder{width:136px;height:36px}}