:root{
  --bg:#F4F8FD;--surface:#FFFFFF;--soft:#EAF3FF;--soft2:#DCEAFB;
  --title:#143250;--text:#243447;--muted:#5B6B7C;--note:#7A8896;
  --blue:#1C63E8;--blue-dark:#154FC0;--line:#C3D6F0;--footer:#0E2338;--footer-text:#D5E6F6;
  --shadow:0 14px 34px rgba(16,48,84,0.08);--radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}
body.menu-open{overflow:hidden}
img,svg,video{max-width:100%}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-dark)}
button,input,textarea,select{font:inherit}
.site-header{position:sticky;top:0;z-index:9999;width:100%;background:rgba(247,251,255,.96);box-shadow:0 8px 24px rgba(16,48,84,.08);backdrop-filter:blur(14px)}
.header-inner{max-width:1220px;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;min-width:148px}
.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain}
.logo-placeholder{display:inline-flex;align-items:center;justify-content:center;min-width:132px;height:40px;border-radius:12px;background:var(--soft);color:var(--title);font-weight:800;letter-spacing:.04em}
.nav-core{display:flex;align-items:center;gap:6px;white-space:nowrap;flex-wrap:nowrap}
.nav-core a{color:#143250;padding:8px 12px;border-radius:999px;font-weight:700;text-decoration:none}
.nav-core a.is-current,.nav-core a:hover{background:#E4F0FF;color:#1C63E8}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.login-btn{height:42px;min-width:88px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;background:#1C63E8;color:#FFFFFF;border-radius:999px;text-decoration:none;font-weight:700;white-space:nowrap}
.register-btn{height:42px;min-width:88px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;background:#FFFFFF;color:#143250;border:1px solid #C3D6F0;border-radius:999px;text-decoration:none;font-weight:700;white-space:nowrap}
.login-btn:hover{color:#fff;background:var(--blue-dark)}.register-btn:hover{color:var(--blue);border-color:var(--blue)}
.desktop-head{display:contents}
.mobile-top{display:none;width:100%;grid-template-columns:44px 1fr 72px;align-items:center;gap:8px}
.menu-btn,.drawer-close{border:0;background:var(--surface);color:var(--title);width:42px;height:42px;border-radius:12px;cursor:pointer;font-size:22px;line-height:1}
.mobile-brand{justify-self:center;display:flex;align-items:center;justify-content:center;min-width:0}
.mobile-brand img{height:36px;width:auto;max-width:154px;object-fit:contain}
.mobile-login{height:40px;min-width:68px;padding:0 14px}
.channel-bar{background:#fff;border-top:1px solid rgba(195,214,240,.55);border-bottom:1px solid rgba(195,214,240,.7)}
.channel-scroll{max-width:1220px;margin:0 auto;padding:10px 20px;display:flex;gap:16px;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin}
.channel-scroll a{flex:0 0 auto;color:#5B6B7C;font-weight:700;font-size:14px;white-space:nowrap}
.channel-scroll a:hover,.channel-scroll a.is-current{color:#1C63E8}
.site-main{display:block;max-width:100%;min-height:60vh}
.page-shell{width:min(1220px,calc(100% - 40px));margin:0 auto}
.page-shell.with-float{padding-right:68px}
.hero,.section{padding:72px 0}
.hero{padding-top:78px}
.hero-grid,.split{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:34px;align-items:center}
.split.reverse{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:var(--soft);color:var(--blue);font-weight:800;font-size:13px;letter-spacing:.04em}
h1,h2,h3{color:var(--title);margin-top:0}
h1{font-size:clamp(40px,4.7vw,52px);line-height:1.13;margin-bottom:22px;letter-spacing:-.03em}
h2{font-size:clamp(28px,3.2vw,38px);line-height:1.25;margin-bottom:18px}
h3{font-size:20px;line-height:1.4;margin-bottom:10px}
p{font-size:17px;line-height:1.82;margin:0 0 16px}
.lead{font-size:18px;color:#334A61;line-height:1.88;max-width:800px}
.muted{color:var(--muted)}.note{color:var(--note);font-size:14px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.text-link{display:inline-flex;align-items:center;gap:6px;font-weight:800;color:var(--blue)}
.text-link::after{content:"→";font-size:15px}
.surface{background:#fff;border:1px solid rgba(195,214,240,.75);border-radius:18px;box-shadow:var(--shadow)}
.pad{padding:26px}
.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:18px;background:#EAF3FF;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;display:grid;place-items:center;padding:22px;text-align:center;color:#6D8194;font-weight:700;background:linear-gradient(135deg,#EAF3FF,#F7FBFF)}
.media.hero-media{height:280px;aspect-ratio:auto}.media.feature-media{height:244px;aspect-ratio:auto}.media.thumb-media{height:176px;aspect-ratio:auto}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}
.stat-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.stat{padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px}
.stat strong{display:block;color:var(--title);font-size:18px;margin-bottom:6px}.stat span{color:var(--muted);font-size:14px;line-height:1.6}
.short-scroll{display:flex;gap:12px;overflow-x:auto;padding:4px 0 12px;scrollbar-width:thin}
.short-scroll a{flex:0 0 auto;padding:11px 16px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--title);font-weight:800}
.list-clean{list-style:none;padding:0;margin:0}.list-clean li{padding:13px 0;border-bottom:1px solid #E4EDF7;line-height:1.7}.list-clean li:last-child{border-bottom:0}
.steps{counter-reset:step;display:grid;gap:16px}.step{position:relative;padding:22px 22px 22px 68px;background:#fff;border:1px solid var(--line);border-radius:18px}.step::before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:20px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:800}
.compare{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.compare .surface{padding:26px}
.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.topic-item{padding:16px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 8px 24px rgba(16,48,84,.05)}
.topic-item h3{margin:14px 0 8px}.topic-item p{font-size:15px;line-height:1.7;color:var(--muted);min-height:50px}
.text-topic{display:flex;min-height:100%;flex-direction:column;justify-content:center;padding:24px}
.bands{display:grid;gap:18px}.band{display:grid;grid-template-columns:180px 1fr;gap:22px;align-items:start;padding:24px;background:#fff;border:1px solid var(--line);border-radius:18px}.band strong{color:var(--title);font-size:18px}
.quote-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.quote{padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px}.quote p{font-size:15px;line-height:1.75;color:#41566A}.quote b{display:block;color:var(--title);margin-top:12px}
.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.faq-item h3{font-size:18px;margin-bottom:8px}.faq-item p{font-size:16px;margin:0;color:#43586D}
.reading{max-width:860px;margin:0 auto}.reading h2{margin-top:34px}.reading h3{margin-top:26px}.reading ul,.reading ol{padding-left:22px}.reading li{font-size:16.5px;line-height:1.8;margin:7px 0}
.info-strip{padding:18px 20px;border-radius:16px;background:var(--soft);border:1px solid var(--soft2);color:#36516E;line-height:1.75}
.kicker-nav{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.kicker-nav a{padding:9px 13px;background:#fff;border:1px solid var(--line);border-radius:999px;font-weight:700}
.float-actions{position:fixed;right:16px;top:42%;z-index:8000;width:92px;display:grid;gap:8px}
.float-actions a,.float-actions button{min-height:40px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--blue);font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center;text-align:center;padding:8px;cursor:pointer;box-shadow:0 8px 20px rgba(16,48,84,.08)}
.float-actions a.primary{background:var(--blue);color:#fff;border-color:var(--blue)}
.drawer-overlay{position:fixed;inset:0;background:rgba(10,27,44,.35);opacity:0;visibility:hidden;transition:.25s;z-index:12000}
.mobile-drawer{position:fixed;left:0;top:0;bottom:0;width:min(86vw,328px);background:#fff;transform:translateX(-104%);transition:.25s;z-index:13000;overflow-y:auto;box-shadow:18px 0 40px rgba(10,27,44,.18)}
.mobile-drawer.open{transform:translateX(0)}.drawer-overlay.open{opacity:1;visibility:visible}
.drawer-head{position:sticky;top:0;background:#fff;padding:16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #E6EEF7}
.drawer-logo img{height:36px;width:auto;max-width:154px;object-fit:contain}
.drawer-group{padding:18px 18px 4px}.drawer-group h3{font-size:14px;color:var(--note);margin-bottom:8px}.drawer-group a{display:block;padding:10px 0;color:var(--title);font-weight:700;border-bottom:1px dashed #E5EDF7}
.site-footer{background:var(--footer);color:var(--footer-text);padding:54px 0 24px;margin-top:40px}
.footer-grid{width:min(1220px,calc(100% - 40px));margin:0 auto;display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:30px}
.footer-brand img{height:42px;width:auto;max-width:170px;object-fit:contain}.footer-brand .logo-placeholder{background:#173755;color:#fff}
.site-footer h3{color:#fff;font-size:16px}.site-footer p,.site-footer a{color:var(--footer-text);font-size:14px;line-height:1.8}.site-footer a{display:block;margin:6px 0}.footer-bottom{width:min(1220px,calc(100% - 40px));margin:34px auto 0;padding-top:22px;border-top:1px solid rgba(213,230,246,.18);font-size:13px;line-height:1.8;color:#B7CDE1}
.mobile-bottom{display:none;position:fixed;left:0;right:0;bottom:0;z-index:9000;background:#fff;border-top:1px solid var(--line);grid-template-columns:repeat(4,1fr);padding:7px 8px max(7px,env(safe-area-inset-bottom))}
.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:42px;color:var(--title);font-size:13px;font-weight:800}
.mobile-bottom a.is-current{color:var(--blue)}
@media(max-width:1100px){.nav-core a{padding:8px 9px;font-size:14px}.header-actions{gap:7px}.login-btn,.register-btn{min-width:78px;padding:0 14px}.page-shell.with-float{padding-right:0}.float-actions{display:none}.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:900px){.desktop-head{display:none}.mobile-top{display:grid}.channel-bar{display:none}.header-inner{min-height:64px;padding:0 14px}.page-shell{width:min(100% - 28px,760px)}.hero,.section{padding:52px 0}.hero{padding-top:52px}.hero-grid,.split,.split.reverse{grid-template-columns:1fr;gap:24px}.stat-row,.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.quote-grid{grid-template-columns:1fr}.compare{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mobile-bottom{display:grid}.site-footer{padding-bottom:92px}.site-main{padding-bottom:70px}}
@media(max-width:560px){h1{font-size:clamp(28px,9vw,36px)}h2{font-size:27px}p{font-size:16px}.lead{font-size:17px}.hero,.section{padding:48px 0}.stat-row,.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.topic-item{padding:11px}.topic-item p{font-size:13.5px;min-height:0}.media.thumb-media{height:124px}.media.feature-media{height:210px}.media.hero-media{height:205px}.band{grid-template-columns:1fr;gap:8px;padding:20px}.footer-grid{grid-template-columns:1fr}.footer-grid>div{padding-bottom:4px}.site-logo{min-width:0}.logo-placeholder{min-width:112px;font-size:14px}.mobile-brand img{max-width:142px}.mobile-top{grid-template-columns:44px minmax(0,1fr) 68px}}
@media(max-width:390px){.header-inner{padding:0 10px}.mobile-top{gap:4px}.mobile-brand img{max-width:132px}.mobile-login{min-width:64px;padding:0 12px}.topic-grid{gap:10px}}