:root{
--brand:#6C3FC5;--brand-2:#00C2A8;--brand-3:#FF6B4A;
--bg:#f7f7fb;--bg-soft:#ffffff;--text:#1c1c28;--text-soft:#55556a;
--line:#e6e6f0;--shadow:0 8px 30px rgba(30,20,80,.08);
--radius:16px;--max:1180px;
}
html[data-theme="dark"]{
--bg:#0e0e17;--bg-soft:#171725;--text:#eef0f7;--text-soft:#a9adc2;
--line:#2a2a3d;--shadow:0 8px 30px rgba(0,0,0,.5);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
background:var(--bg);color:var(--text);line-height:1.8;
-webkit-font-smoothing:antialiased;transition:background .3s,color .3s;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:20px;top:10px;background:var(--brand);color:#fff;padding:8px 14px;border-radius:8px;z-index:9999}
/* header */
header.site{
position:sticky;top:0;z-index:900;background:color-mix(in srgb,var(--bg-soft) 88%,transparent);
backdrop-filter:blur(10px);border-bottom:1px solid var(--line);transition:box-shadow .3s;
}
header.site.scrolled{box-shadow:var(--shadow)}
.nav{display:flex;align-items:center;gap:18px;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:.5px}
.logo .mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff;font-size:20px;font-weight:800}
.logo small{display:block;font-size:11px;font-weight:500;color:var(--text-soft);letter-spacing:0}
nav.menu{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
nav.menu a{padding:8px 12px;border-radius:10px;font-size:14.5px;color:var(--text-soft);transition:.2s}
nav.menu a:hover{background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand)}
.tools{display:flex;align-items:center;gap:8px}
.search{display:flex;align-items:center;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:4px 6px 4px 14px}
.search input{border:0;background:transparent;color:var(--text);outline:0;width:130px;font-size:14px}
.search button{border:0;background:var(--brand);color:#fff;border-radius:999px;padding:6px 14px;font-size:13px;cursor:pointer}
.icon-btn{border:1px solid var(--line);background:var(--bg-soft);color:var(--text);width:38px;height:38px;border-radius:11px;cursor:pointer;font-size:16px;display:grid;place-items:center;transition:.2s}
.icon-btn:hover{border-color:var(--brand);color:var(--brand)}
.burger{display:none}
/* hero */
.hero{position:relative;overflow:hidden;padding:60px 0 40px}
.hero-bg{position:absolute;inset:0;z-index:-1;opacity:.9}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:color-mix(in srgb,var(--brand) 14%,transparent);color:var(--brand);padding:6px 14px;border-radius:999px;font-size:13px;font-weight:600}
h1{font-size:40px;line-height:1.25;margin:18px 0 14px;letter-spacing:-.5px}
h1 .hl{background:linear-gradient(120deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{color:var(--text-soft);font-size:16.5px;max-width:640px}
.cta{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:12px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.2s}
.btn-primary{background:linear-gradient(120deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 10px 24px color-mix(in srgb,var(--brand) 35%,transparent)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{border-color:var(--line);background:var(--bg-soft);color:var(--text)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.stats{display:flex;gap:34px;margin-top:34px;flex-wrap:wrap}
.stat b{font-size:30px;font-weight:800;background:linear-gradient(120deg,var(--brand),var(--brand-3));-webkit-background-clip:text;background-clip:text;color:transparent;display:block}
.stat span{font-size:13px;color:var(--text-soft)}
/* carousel */
.carousel{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:var(--bg-soft)}
.slides{display:flex;transition:transform .6s cubic-bezier(.5,.1,.2,1)}
.slide{min-width:100%;padding:26px}
.slide .tag{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:1px}
.slide h3{font-size:20px;margin:8px 0 8px}
.slide p{color:var(--text-soft);font-size:14.5px}
.slide .art{margin-top:16px;border-radius:12px;overflow:hidden}
.dots{display:flex;gap:8px;justify-content:center;padding:0 0 18px}
.dots i{width:9px;height:9px;border-radius:50%;background:var(--line);cursor:pointer;transition:.2s}
.dots i.on{background:var(--brand);width:24px;border-radius:999px}
/* sections */
section{padding:56px 0}
.sec-head{max-width:760px;margin-bottom:34px}
.sec-head .k{color:var(--brand);font-weight:700;font-size:14px;letter-spacing:1px}
.sec-head h2{font-size:30px;margin:8px 0 12px;letter-spacing:-.5px}
.sec-head p{color:var(--text-soft)}
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--brand) 40%,var(--line))}
.card h3{font-size:18px;margin:14px 0 8px}
.card h4{font-size:15.5px;margin:12px 0 6px}
.card p{color:var(--text-soft);font-size:14.5px}
.card ul{margin:10px 0 0 18px;color:var(--text-soft);font-size:14.5px}
.card ul li{margin:5px 0}
.ico{width:48px;height:48px;border-radius:13px;display:grid;place-items:center;background:color-mix(in srgb,var(--brand) 14%,transparent);color:var(--brand)}
/* timeline */
.timeline{border-left:2px solid var(--line);margin-left:10px;padding-left:26px}
.timeline .item{position:relative;padding-bottom:26px}
.timeline .item::before{content:"";position:absolute;left:-33px;top:6px;width:14px;height:14px;border-radius:50%;background:var(--brand);border:3px solid var(--bg-soft)}
.timeline .item b{color:var(--brand)}
.timeline .item p{color:var(--text-soft);font-size:14.5px}
/* articles */
.article{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;gap:8px;transition:.25s}
.article:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.article .meta{font-size:12.5px;color:var(--text-soft);display:flex;gap:12px;flex-wrap:wrap}
.article h3{font-size:17px;line-height:1.5}
.article p{color:var(--text-soft);font-size:14px;flex:1}
.article .more{color:var(--brand);font-weight:600;font-size:14px}
/* faq */
.faq-item{border:1px solid var(--line);border-radius:12px;background:var(--bg-soft);margin-bottom:12px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:transparent;border:0;color:var(--text);font-size:15.5px;font-weight:600;padding:18px 20px;cursor:pointer;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq-q .plus{font-size:20px;color:var(--brand);transition:.3s}
.faq-item.open .plus{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a div{padding:0 20px 20px;color:var(--text-soft);font-size:14.5px}
/* howto */
.steps{counter-reset:s;display:grid;gap:16px}
.step{position:relative;background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:20px 20px 20px 68px}
.step::before{counter-increment:s;content:counter(s);position:absolute;left:18px;top:18px;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-weight:800}
.step h4{margin-bottom:6px}
.step p{color:var(--text-soft);font-size:14.5px}
/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.info-list{display:grid;gap:14px}
.info{display:flex;gap:14px;background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:18px}
.info .ico{flex:0 0 44px;width:44px;height:44px}
.info b{display:block;font-size:15px}
.info span{color:var(--text-soft);font-size:14px}
.map{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--bg-soft);min-height:280px}
/* footer */
footer.site{background:var(--bg-soft);border-top:1px solid var(--line);padding:50px 0 24px;margin-top:30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.foot-grid h4{font-size:15px;margin-bottom:14px}
.foot-grid a,.foot-grid p{color:var(--text-soft);font-size:14px;display:block;margin:7px 0}
.foot-grid a:hover{color:var(--brand)}
.copy{border-top:1px solid var(--line);margin-top:34px;padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--text-soft);font-size:13px}
/* back to top */
#top{position:fixed;right:22px;bottom:26px;width:46px;height:46px;border-radius:14px;border:0;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:20px;cursor:pointer;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.3s;z-index:800}
#top.show{opacity:1;pointer-events:auto}
/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:.6s}
.reveal.in{opacity:1;transform:none}
/* breadcrumb */
.crumb{font-size:13px;color:var(--text-soft);padding:14px 0}
.crumb a:hover{color:var(--brand)}
.crumb span{margin:0 6px}
/* responsive */
@media(max-width:980px){
.hero-grid{grid-template-columns:1fr}
.g3,.g4{grid-template-columns:repeat(2,1fr)}
.foot-grid{grid-template-columns:1fr 1fr}
.contact-grid{grid-template-columns:1fr}
}
@media(max-width:720px){
nav.menu{position:fixed;inset:68px 0 auto 0;background:var(--bg-soft);flex-direction:column;padding:14px;border-bottom:1px solid var(--line);display:none}
nav.menu.open{display:flex}
.burger{display:grid}
.search input{width:90px}
h1{font-size:30px}
.sec-head h2{font-size:24px}
.g3,.g4,.g2{grid-template-columns:1fr}
.foot-grid{grid-template-columns:1fr}
.stats{gap:22px}
}