:root{--brand:#0d9488;--brand2:#0ea5e9;--brand-d:#0b6f68;--ink:#12211f;--sub:#5b6b69;--line:#e2ecea;--bg:#f6fbfa;--card:#fff;--warn:#f59e0b;--grad:linear-gradient(135deg,#0d9488,#0ea5e9);--sh:0 6px 24px rgba(13,148,136,.10);--sh-h:0 16px 40px rgba(13,148,136,.20);--r:14px}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand-d);text-decoration:none}
a:hover{color:var(--brand)}
h1,h2,h3,h4{line-height:1.35;margin:0 0 12px}
h1{font-size:2.05rem}
h2{font-size:1.6rem}
h3{font-size:1.15rem}
p{margin:0 0 14px}
ul,ol{margin:0 0 14px;padding-left:1.2em}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
.sec{padding:64px 0}
.sec-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{text-align:center;max-width:780px;margin:0 auto 36px}
.sec-head h2{margin-bottom:10px}
.sec-head p{color:var(--sub);margin:0}
.eyebrow{display:inline-block;font-size:.82rem;letter-spacing:.08em;color:var(--brand-d);background:rgba(13,148,136,.10);border-radius:999px;padding:4px 14px;margin-bottom:12px;font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:600;font-size:1rem;border:2px solid transparent;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .18s ease;font-family:inherit}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--sh)}
.btn-primary:hover{color:#fff;box-shadow:var(--sh-h);transform:translateY(-2px)}
.btn-outline{background:#fff;color:var(--brand-d);border-color:var(--brand)}
.btn-outline:hover{background:rgba(13,148,136,.08);color:var(--brand-d);transform:translateY(-2px)}
.btn-sm{padding:9px 18px;font-size:.9rem}
.btn-block{width:100%}
.top{position:fixed;inset:0 0 auto 0;z-index:99;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);transition:box-shadow .25s ease,background .25s ease}
.top.scrolled{background:rgba(9,42,40,.92);border-bottom-color:rgba(255,255,255,.12);box-shadow:0 8px 26px rgba(0,0,0,.18)}
.top.scrolled .logo-txt,.top.scrolled .menu a,.top.scrolled .dd-lb{color:#eaf7f5}
.top.scrolled .burger span{background:#eaf7f5}
.nav-inner{display:flex;align-items:center;gap:18px;min-height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.12rem;color:var(--ink);flex:0 0 auto}
.logo img{width:34px;height:34px;border-radius:9px}
.menu{display:flex;align-items:center;gap:4px;list-style:none;margin:0 0 0 auto;padding:0}
.menu>li{position:relative}
.menu a,.dd-lb{display:block;padding:10px 14px;font-size:.96rem;font-weight:600;color:var(--ink);border-radius:10px;cursor:pointer}
.menu a:hover,.dd-lb:hover{background:rgba(13,148,136,.10);color:var(--brand-d)}
.dd input.cssonly{position:absolute;opacity:0;width:0;height:0;pointer-events:none}
.dd-lb::after{content:"▾";display:inline-block;margin-left:6px;font-size:.75rem;transition:transform .22s ease}
.dd:hover .dd-lb::after,.dd input:checked~.dd-lb::after{transform:rotate(180deg)}
.dd-panel{position:absolute;left:0;top:100%;min-width:216px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--sh-h);padding:8px;display:none}
.dd:hover .dd-panel,.dd:focus-within .dd-panel,.dd input:checked~.dd-panel{display:block}
.dd-panel a{padding:9px 12px;font-weight:500;font-size:.93rem}
.nav-cta{margin-left:12px;padding:10px 22px;font-size:.94rem}
.nav-open,input.cssonly.nav-open{position:absolute;opacity:0;width:0;height:0;pointer-events:none}
.burger{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);margin-left:auto;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.burger span{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px}
.hero{padding:118px 0 56px;background:radial-gradient(900px 420px at 88% -10%,rgba(14,165,233,.16),transparent 70%),radial-gradient(700px 380px at 4% 10%,rgba(13,148,136,.14),transparent 70%)}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:44px;align-items:center}
.hero h1{font-size:2.5rem;margin-bottom:14px}
.hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:1.08rem;color:var(--sub);max-width:560px}
.hero-btns{display:flex;flex-wrap:wrap;gap:14px;margin:22px 0 26px}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;list-style:none;padding:0;margin:0}
.hero-stats li{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}
.hero-stats b{display:block;font-size:1.42rem;color:var(--brand-d)}
.hero-stats span{font-size:.84rem;color:var(--sub)}
.demo{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--sh-h);overflow:hidden}
.demo-head{display:flex;align-items:center;gap:10px;padding:12px 16px;background:var(--grad);color:#fff;font-size:.9rem;font-weight:600}
.demo-head .dot{width:8px;height:8px;border-radius:50%;background:#a7f3d0;box-shadow:0 0 0 3px rgba(167,243,208,.35)}
.demo-head .sep{margin-left:auto;font-weight:400;opacity:.92}
.demo-body{display:grid;grid-template-columns:150px 1fr;min-height:212px}
.demo-side{border-right:1px solid var(--line);padding:10px 8px;background:#fbfefd}
.demo-side p{margin:0 0 8px;font-size:.75rem;color:var(--sub);font-weight:600;padding-left:6px}
.conv-item{display:block;padding:9px 10px;border-radius:10px;font-size:.86rem;cursor:pointer;margin-bottom:4px;border:1px solid transparent}
.conv-item b{display:block;font-size:.88rem}
.conv-item i{font-style:normal;font-size:.75rem;color:var(--sub)}
#c1:checked~.demo-body>.demo-side label[for=c1],#c2:checked~.demo-body>.demo-side label[for=c2],#c3:checked~.demo-body>.demo-side label[for=c3]{background:rgba(13,148,136,.12);border-color:rgba(13,148,136,.35)}
.demo-main{padding:12px 14px;display:flex;flex-direction:column;gap:8px;justify-content:flex-end;background:#fff}
.demo>input.cssonly{position:absolute;opacity:0;width:0;height:0;pointer-events:none}
.chat{display:none;flex-direction:column;gap:8px}
#c1:checked~.demo-body>.demo-main>.chat.ch1,#c2:checked~.demo-body>.demo-main>.chat.ch2,#c3:checked~.demo-body>.demo-main>.chat.ch3{display:flex}
.msg{max-width:82%;padding:8px 12px;border-radius:12px;font-size:.87rem;line-height:1.6}
.msg-in{background:#f1f5f4;border:1px solid var(--line);align-self:flex-start}
.msg-out{background:var(--grad);color:#fff;align-self:flex-end}
.msg-time{align-self:center;font-size:.72rem;color:var(--sub)}
.demo-scripts{border-top:1px solid var(--line);padding:10px 14px;background:#fbfefd}
.demo-scripts .sc-head{display:flex;align-items:center;gap:8px;font-size:.78rem;color:var(--sub);font-weight:600;margin:0 0 8px}
.sc-list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.sc-list label{display:block}
.sc-list input{position:absolute;opacity:0;width:0;height:0}
.sc-list span{display:block;padding:7px 12px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:.82rem;cursor:pointer;transition:.2s}
.sc-list input:checked~span{background:rgba(13,148,136,.14);border-color:var(--brand);color:var(--brand-d);font-weight:600}
.sc-list span:hover{transform:translateY(-2px);box-shadow:var(--sh)}
.demo-input{display:flex;gap:8px;padding:10px 14px 14px;background:#fbfefd}
.demo-input input{flex:1;min-width:0;padding:10px 14px;border:1px solid var(--line);border-radius:999px;font-size:.88rem;font-family:inherit}
.demo-input input:focus{outline:2px solid rgba(13,148,136,.35);border-color:var(--brand)}
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}
.card:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(13,148,136,.35)}
.card .ico{font-size:1.5rem;display:block;margin-bottom:10px}
.card h3{margin-bottom:8px}
.card p{color:var(--sub);font-size:.94rem;margin:0}
.card .tag{display:inline-block;font-size:.78rem;color:var(--brand-d);background:rgba(13,148,136,.10);border-radius:999px;padding:3px 10px;margin-top:12px}
.scene{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px}
.scene h3{font-size:1.02rem}
.scene p{font-size:.9rem;color:var(--sub);margin:0}
.scene ul{margin:10px 0 0;padding-left:1.1em;font-size:.88rem;color:var(--sub)}
.plan{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px 22px;display:flex;flex-direction:column}
.plan.best{border:2px solid var(--brand);box-shadow:var(--sh-h);transform:translateY(-6px)}
.plan .badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:.78rem;font-weight:600;padding:4px 14px;border-radius:999px;white-space:nowrap}
.plan h3{margin-bottom:4px}
.plan .price{font-size:1.9rem;font-weight:700;color:var(--brand-d);margin:6px 0 4px}
.plan .price small{font-size:.86rem;font-weight:500;color:var(--sub)}
.plan ul{list-style:none;padding:0;margin:14px 0 20px;font-size:.92rem;color:var(--sub)}
.plan li{padding:6px 0 6px 24px;position:relative;border-bottom:1px dashed var(--line)}
.plan li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}
.plan .btn{margin-top:auto}
.vs-table{width:100%;border-collapse:collapse;font-size:.92rem;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.vs-table th,.vs-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.vs-table th{background:rgba(13,148,136,.08);font-size:.9rem}
.vs-table tr:last-child td{border-bottom:0}
.vs-scroll{overflow-x:auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:600;list-style:none;display:flex;gap:10px;align-items:flex-start}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"＋";color:var(--brand);font-weight:700;flex:0 0 auto}
.faq details[open] summary::before{content:"－"}
.faq details[open] summary{border-bottom:1px solid var(--line);background:rgba(13,148,136,.05)}
.faq .faq-body{padding:16px 20px 4px}
.faq ol{font-size:.94rem;color:var(--sub);margin:0}
.testi{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px}
.testi .stars{color:var(--warn);font-size:.95rem;letter-spacing:2px}
.testi p{font-size:.93rem;color:var(--sub)}
.testi .who{display:flex;align-items:center;gap:10px;margin-top:12px}
.avatar{width:38px;height:38px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.95rem;flex:0 0 auto}
.testi .who b{display:block;font-size:.92rem}
.testi .who i{font-style:normal;font-size:.8rem;color:var(--sub)}
.news-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;transition:transform .2s ease,box-shadow .2s ease}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--sh-h)}
.news-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.news-card .nc-body{padding:18px;display:flex;flex-direction:column;flex:1}
.news-card .meta{font-size:.8rem;color:var(--sub);margin-bottom:8px}
.news-card h3{font-size:1.02rem;margin-bottom:8px}
.news-card p{font-size:.9rem;color:var(--sub);margin:0 0 14px}
.news-card .more{margin-top:auto;font-weight:600;font-size:.9rem}
.cta-band{background:var(--grad);color:#fff;border-radius:20px;padding:44px 28px;text-align:center;box-shadow:var(--sh-h)}
.cta-band h2{color:#fff}
.cta-band p{color:rgba(255,255,255,.92);max-width:660px;margin:0 auto 22px}
.cta-band .btn-outline{background:#fff;border-color:#fff}
.footer{background:#092a28;color:#c7dcd9;padding:52px 0 26px;font-size:.92rem}
.footer h4{color:#fff;font-size:1rem;margin-bottom:12px}
.footer a{color:#c7dcd9;display:block;padding:4px 0}
.footer a:hover{color:#fff}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:26px}
.footer .brandline{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.08rem;margin-bottom:12px}
.footer .brandline img{width:32px;height:32px;border-radius:8px}
.footer .legal{margin-top:26px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:.85rem;color:#9dbfbb}
.footer .legal a{display:inline;padding:0 6px}
.notice{font-size:.8rem;color:#9dbfbb;margin-top:10px;line-height:1.6}
.totop{position:fixed;right:22px;bottom:26px;width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--sh-h);z-index:80;font-size:1.05rem}
.totop:hover{color:#fff;transform:translateY(-3px)}
.crumb{font-size:.85rem;color:var(--sub);padding:96px 0 0}
.crumb a{color:var(--sub)}
.crumb span{margin:0 6px}
.page-head{padding:14px 0 0}
.page-head h1{margin-bottom:10px}
.page-head p{color:var(--sub);max-width:760px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:32px;align-items:start;padding:24px 0 64px}
.article{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px}
.article h1{font-size:1.85rem}
.article .a-meta{font-size:.85rem;color:var(--sub);display:flex;flex-wrap:wrap;gap:14px;margin-bottom:18px;border-bottom:1px solid var(--line);padding-bottom:14px}
.article img{border-radius:12px;margin:6px 0 8px}
.article figcaption{font-size:.82rem;color:var(--sub);margin-bottom:18px}
.article h2{font-size:1.3rem;margin-top:30px;padding-left:12px;border-left:4px solid var(--brand)}
.article h3{font-size:1.08rem;margin-top:22px}
.article p{font-size:1rem}
.article blockquote{margin:18px 0;padding:14px 18px;background:rgba(13,148,136,.06);border-left:4px solid var(--brand);border-radius:0 10px 10px 0;font-size:.96rem;color:#255}
.article blockquote b{display:block;margin-top:8px;color:var(--brand-d);font-size:.88rem}
.article ul,.article ol{color:var(--sub)}
.article .data-box{background:#f2fbf9;border:1px solid rgba(13,148,136,.25);border-radius:12px;padding:16px 18px;margin:18px 0}
.article .data-box h3{margin-top:0}
.article .data-box li{font-size:.94rem}
.pager{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;margin-top:30px;padding-top:18px;border-top:1px solid var(--line);font-size:.92rem}
.side{position:sticky;top:86px;display:grid;gap:18px}
.side .sc{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;box-shadow:var(--sh)}
.side h3{font-size:.98rem;margin:0 0 12px;display:flex;align-items:center;gap:8px}
.side h3::before{content:"";width:4px;height:16px;border-radius:2px;background:var(--grad);display:block}
.side ul{list-style:none;margin:0;padding:0}
.toc li{position:relative;padding:5px 0 5px 18px;font-size:.88rem}
.toc::before{content:"";position:absolute;left:5px;top:14px;bottom:12px;width:2px;background:var(--line)}
.toc li::before{content:"";position:absolute;left:0;top:12px;width:12px;height:12px;border-radius:50%;background:#fff;border:2px solid var(--line)}
.toc li.on a{color:var(--brand-d);font-weight:700}
.toc li.on::before{border-color:var(--brand);background:var(--brand)}
.hot li{display:flex;gap:10px;align-items:flex-start;padding:7px 0;font-size:.88rem;border-bottom:1px dashed var(--line)}
.hot li:last-child{border-bottom:0}
.hot .rk{flex:0 0 auto;width:20px;height:20px;border-radius:6px;background:#e6eeed;color:#657;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:700;transition:transform .2s ease}
.hot li:nth-child(1) .rk{background:var(--grad);color:#fff}
.hot li:nth-child(2) .rk{background:linear-gradient(135deg,#f59e0b,#f97316);color:#fff}
.hot li:nth-child(3) .rk{background:linear-gradient(135deg,#fbbf24,#facc15);color:#7c4a03}
.hot a:hover{color:var(--brand-d)}
.hot li:hover .rk{transform:scale(1.12)}
.pills{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:0}
.pills a{font-size:.82rem;padding:5px 12px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--sub)}
.pills a:hover{border-color:var(--brand);color:var(--brand-d);background:rgba(13,148,136,.07)}
.comments{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;margin-top:26px}
.comments h2{font-size:1.2rem;margin-top:0}
.cmt{display:flex;gap:12px;padding:14px 0;border-bottom:1px dashed var(--line)}
.cmt:last-child{border-bottom:0}
.cmt .meta{font-size:.8rem;color:var(--sub);margin-bottom:4px}
.cmt .meta b{color:var(--ink);font-size:.92rem;margin-right:8px}
.cmt p{margin:0;font-size:.93rem;color:#37474f}
.sitemap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.sitemap-grid .card ul{font-size:.92rem;list-style:none;padding:0}
.sitemap-grid .card li{padding:5px 0;border-bottom:1px dashed var(--line)}
.err{padding:140px 0 90px;text-align:center}
.err .code{font-size:5rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.spec{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.spec li{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}
.spec b{display:block;font-size:.86rem;color:var(--sub);font-weight:600;margin-bottom:4px}
.steps{counter-reset:st;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;list-style:none;padding:0;margin:0}
.steps li{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px;position:relative}
.steps li::before{counter-increment:st;content:counter(st);display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:var(--grad);color:#fff;font-weight:700;margin-bottom:10px}
.steps h3{font-size:1rem}
.steps p{font-size:.9rem;color:var(--sub);margin:0}
html.js .reveal{opacity:0;transform:translateY(16px)}
html.js .reveal.in{opacity:1;transform:none;transition:opacity .6s ease,transform .6s ease}
html{scroll-behavior:smooth}
section[id]{scroll-margin-top:86px}
@media(max-width:992px){
.burger{display:flex}
.menu{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--sh-h);padding:10px 16px 18px;display:none;max-height:74vh;overflow:auto}
.nav-open:checked~.menu{display:flex}
.dd-panel{position:static;display:none;box-shadow:none;border-color:var(--line);margin:4px 0 8px}
.nav-cta{margin:10px 0 0;width:100%}
.hero{padding-top:96px}
.hero-grid{grid-template-columns:1fr;gap:28px}
.hero h1{font-size:2rem}
.g3,.dl-grid,.steps{grid-template-columns:repeat(2,1fr)}
.spec{grid-template-columns:repeat(2,1fr)}
.layout{grid-template-columns:1fr}
.side{position:static}
.footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
.sec{padding:48px 0}
h1{font-size:1.7rem}
.hero h1{font-size:1.72rem}
.g2,.g3,.dl-grid,.steps,.spec,.sitemap-grid{grid-template-columns:1fr}
.hero-stats{grid-template-columns:1fr}
.plan.best{transform:none}
.demo-body{grid-template-columns:1fr}
.demo-side{border-right:0;border-bottom:1px solid var(--line);display:flex;gap:6px;overflow-x:auto}
.demo-side p{display:none}
.conv-item{min-width:130px;margin-bottom:0}
.article{padding:20px}
.article h1{font-size:1.45rem}
.cta-band{padding:32px 18px}
}
@media(max-width:480px){
body{font-size:15px}
.wrap{padding:0 14px}
.hero{padding-top:88px}
.hero h1{font-size:1.5rem}
.btn{width:100%}
.hero-btns .btn,.cta-band .btn{width:100%}
.msg{max-width:90%}
.totop{right:14px;bottom:16px;width:42px;height:42px}
.footer .cols{grid-template-columns:1fr}
}