:root{--brand:#0068ff;--brand2:#00b2ff;--brand-dark:#0047b3;--ink:#0f172a;--muted:#64748b;--line:#e6ecf5;--bg:#f6f9fe;--card:#fff;--radius:18px;--shadow:0 8px 28px rgba(15,23,42,.08);--shadow-lg:0 18px 46px rgba(0,104,255,.18);--grad:linear-gradient(135deg,#0068ff 0%,#00b2ff 100%)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;overflow-x:hidden}
img{max-width:100%;display:block;height:auto}
a{color:var(--brand);text-decoration:none;transition:color .2s}
a:hover{color:var(--brand-dark)}
ul,ol{list-style:none}
h1,h2,h3,h4{line-height:1.3;font-weight:800;letter-spacing:-.2px}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:background .3s,box-shadow .3s,border-color .3s}
.navbar.scrolled{background:rgba(9,26,58,.94);border-bottom-color:rgba(255,255,255,.08);box-shadow:0 6px 24px rgba(2,12,32,.28)}
.nav-inner{max-width:1200px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:18px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:21px;color:var(--ink);letter-spacing:-.4px}
.logo img{width:38px;height:38px;border-radius:11px;object-fit:cover;box-shadow:0 4px 12px rgba(0,104,255,.28)}
.logo span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.navbar.scrolled .logo{color:#fff}
.nav-menu{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;gap:6px;padding:10px 14px;border-radius:10px;font-weight:600;font-size:15px;color:#233047;cursor:pointer;transition:background .2s,color .2s}
.nav-link:hover,.nav-item:hover>.nav-link{background:rgba(0,104,255,.09);color:var(--brand)}
.navbar.scrolled .nav-link{color:#e8eefb}
.navbar.scrolled .nav-link:hover,.navbar.scrolled .nav-item:hover>.nav-link{background:rgba(255,255,255,.13);color:#fff}
.arrow{width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .3s;margin-top:-3px}
.nav-item:hover>.nav-link .arrow{transform:rotate(-135deg);margin-top:3px}
.dropdown{position:absolute;top:calc(100% + 8px);left:0;min-width:238px;background:#fff;border-radius:14px;box-shadow:0 20px 44px rgba(15,23,42,.16);padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .25s,transform .25s,visibility .25s;border:1px solid var(--line)}
.nav-item:hover>.dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:10px 13px;border-radius:10px;color:#27364d;font-size:14.5px;font-weight:500}
.dropdown a:hover{background:#eef5ff;color:var(--brand)}
.dropdown a b{display:block;font-size:14.5px;font-weight:700;color:#12203a}
.dropdown a i{font-style:normal;font-size:12.5px;color:var(--muted)}
.nav-cta{margin-left:8px}
.hamburger{display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:#fff;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.hamburger i{display:block;width:20px;height:2px;background:#233047;border-radius:2px;transition:.3s}
.nav-toggle{display:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:12px;font-weight:700;font-size:15.5px;cursor:pointer;border:none;font-family:inherit;transition:transform .2s,box-shadow .3s,background .3s;text-align:center}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 26px rgba(0,104,255,.32)}
.btn-primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 16px 34px rgba(0,104,255,.42)}
.btn-outline{background:#fff;color:var(--brand);border:2px solid rgba(0,104,255,.35)}
.btn-outline:hover{color:var(--brand-dark);transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-lg{padding:16px 34px;font-size:16.5px}
.btn-sm{padding:10px 18px;font-size:14px;border-radius:10px}
.btn-block{width:100%}
.nav-cta .btn{color:#fff}
.hero{padding:132px 0 70px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;top:-220px;right:-180px;width:620px;height:620px;background:radial-gradient(circle,rgba(0,178,255,.24),transparent 62%);border-radius:50%}
.hero:after{content:"";position:absolute;bottom:-260px;left:-220px;width:620px;height:620px;background:radial-gradient(circle,rgba(0,104,255,.16),transparent 62%);border-radius:50%}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;position:relative;z-index:2}
.pill{display:inline-flex;align-items:center;gap:8px;background:#e8f2ff;color:var(--brand-dark);border:1px solid rgba(0,104,255,.18);padding:7px 16px;border-radius:999px;font-size:13.5px;font-weight:700;margin-bottom:18px}
.hero h1{font-size:52px;line-height:1.15;margin-bottom:18px}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:18px;color:#465569;max-width:560px;margin-bottom:26px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:34px}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:560px}
.hero-stats .st b{display:block;font-size:28px;color:var(--brand);font-weight:900;line-height:1.2}
.hero-stats .st span{font-size:13.5px;color:var(--muted)}
.section{padding:78px 0}
.section.tint{background:#fff}
.section-head{text-align:center;max-width:760px;margin:0 auto 46px}
.section-head h2{font-size:36px;margin-bottom:14px}
.section-head p{color:var(--muted);font-size:16.5px}
.eyebrow{display:inline-block;color:var(--brand);font-weight:800;font-size:13.5px;letter-spacing:1.4px;text-transform:uppercase;margin-bottom:10px}
.grid{display:grid;gap:24px}
.cards-6{grid-template-columns:repeat(3,1fr)}
.cards-3{grid-template-columns:repeat(3,1fr)}
.cards-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:transform .3s,box-shadow .3s,border-color .3s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(0,104,255,.28)}
.ico{width:54px;height:54px;border-radius:15px;display:flex;align-items:center;justify-content:center;font-size:26px;background:#eaf3ff;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:9px}
.card p{color:var(--muted);font-size:15px}
.stat-band{background:linear-gradient(135deg,#06244f,#0a3d86 55%,#0068ff);color:#fff;border-radius:26px;padding:52px 34px;display:grid;grid-template-columns:repeat(4,1fr);gap:26px;text-align:center;box-shadow:var(--shadow-lg)}
.stat-band b{display:block;font-size:40px;font-weight:900;background:linear-gradient(135deg,#fff,#a9d6ff);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.15}
.stat-band span{font-size:14.5px;opacity:.86}
.split{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}
.split h2{font-size:33px;margin-bottom:16px}
.split p{color:var(--muted);margin-bottom:14px;font-size:16px}
.checklist li{display:flex;gap:12px;align-items:flex-start;padding:9px 0;font-size:15.5px;color:#33415a}
.checklist li b{color:var(--ink)}
.tick{flex:0 0 24px;width:24px;height:24px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:900;margin-top:3px}
.device-mock{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow)}
.device-row{display:flex;gap:14px;justify-content:space-between;align-items:flex-end}
.dev{flex:1;background:#f2f7ff;border:1px solid var(--line);border-radius:14px;padding:16px 10px;text-align:center;font-size:13px;color:#41506b;font-weight:600;transition:.3s}
.dev:hover{transform:translateY(-5px);border-color:rgba(0,104,255,.35)}
.dev i{font-size:26px;font-style:normal;display:block;margin-bottom:8px}
.dev .bar{height:6px;border-radius:6px;background:#dbe8fb;margin-top:10px;overflow:hidden}
.dev .bar u{display:block;height:100%;background:var(--grad);width:88%}
.sync-line{text-align:center;color:var(--brand);font-weight:800;font-size:14px;margin:16px 0 0}
.price-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:34px 28px;position:relative;transition:transform .3s,box-shadow .3s}
.price-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.price-card.featured{border:2px solid var(--brand);box-shadow:var(--shadow-lg);transform:scale(1.03)}
.price-card.featured:hover{transform:scale(1.03) translateY(-6px)}
.badge{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12.5px;font-weight:800;padding:6px 18px;border-radius:999px;white-space:nowrap}
.price-card h3{font-size:20px;margin-bottom:6px}
.price-card .tag{color:var(--muted);font-size:14px;margin-bottom:18px}
.price{font-size:38px;font-weight:900;color:var(--ink);line-height:1;margin-bottom:4px}
.price small{font-size:14px;font-weight:600;color:var(--muted)}
.plist{margin:22px 0}
.plist li{display:flex;gap:10px;padding:8px 0;font-size:14.6px;color:#3b4a63}
.plist li i{font-style:normal;color:var(--brand);font-weight:900}
.faq-wrap{max-width:900px;margin:0 auto}
.faq{background:#fff;border:1px solid var(--line);border-radius:16px;margin-bottom:14px;overflow:hidden;transition:border-color .3s,box-shadow .3s}
.faq[open]{border-color:rgba(0,104,255,.34);box-shadow:var(--shadow)}
.faq summary{list-style:none;cursor:pointer;padding:20px 56px 20px 24px;font-weight:700;font-size:17px;position:relative;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);font-size:24px;font-weight:400;color:var(--brand);transition:transform .3s}
.faq[open] summary:after{content:"−";transform:translateY(-50%)}
.faq .ans{padding:0 24px 22px;color:var(--muted);font-size:15.4px}
.faq .ans ol{counter-reset:s;margin-top:10px}
.faq .ans ol li{counter-increment:s;position:relative;padding-left:30px;margin-bottom:7px}
.faq .ans ol li:before{content:counter(s);position:absolute;left:0;top:2px;width:20px;height:20px;border-radius:50%;background:var(--grad);color:#fff;font-size:11.5px;font-weight:800;display:flex;align-items:center;justify-content:center}
.review-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.stars{color:#ffb400;font-size:15px;letter-spacing:2px;margin-bottom:12px}
.review-card p{color:#38465e;font-size:15px;margin-bottom:16px}
.who{display:flex;align-items:center;gap:12px}
.avatar{width:44px;height:44px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;flex:0 0 44px}
.who b{display:block;font-size:15px}
.who span{font-size:13px;color:var(--muted)}
.news-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .3s,box-shadow .3s}
.news-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.news-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.news-card .body{padding:22px;display:flex;flex-direction:column;flex:1}
.news-card .cat{align-self:flex-start;background:#eaf3ff;color:var(--brand-dark);font-size:12.5px;font-weight:700;padding:5px 12px;border-radius:999px;margin-bottom:12px}
.news-card h3{font-size:18px;margin-bottom:10px}
.news-card h3 a{color:var(--ink)}
.news-card h3 a:hover{color:var(--brand)}
.news-card p{color:var(--muted);font-size:14.6px;flex:1}
.news-card .meta{margin-top:16px;font-size:13px;color:#8b98ac;display:flex;justify-content:space-between}
.cta-band{background:linear-gradient(135deg,#062b5f,#0068ff 70%,#00b2ff);border-radius:26px;padding:58px 40px;text-align:center;color:#fff;box-shadow:var(--shadow-lg)}
.cta-band h2{font-size:36px;margin-bottom:14px;color:#fff}
.cta-band p{opacity:.9;max-width:640px;margin:0 auto 28px;font-size:17px}
.cta-band .btn-outline{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.5)}
.cta-band .btn-outline:hover{background:#fff;color:var(--brand)}
.footer{background:#081833;color:#a9b8d0;padding:64px 0 26px;margin-top:78px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:34px;margin-bottom:40px}
.footer .logo{color:#fff;margin-bottom:16px}
.footer p.fdesc{font-size:14.4px;max-width:320px;color:#8ea1c0}
.fcol h4{color:#fff;font-size:16px;margin-bottom:16px}
.fcol li{margin-bottom:10px}
.fcol a{color:#a9b8d0;font-size:14.6px}
.fcol a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:14px}
.foot-bottom a{color:#a9b8d0}
.foot-bottom a:hover{color:#fff}
.back-top{position:fixed;right:22px;bottom:26px;width:48px;height:48px;border-radius:50%;background:var(--grad);color:#fff;border:none;cursor:pointer;font-size:20px;box-shadow:0 10px 26px rgba(0,104,255,.4);opacity:0;visibility:hidden;transform:translateY(12px);transition:.3s;z-index:900}
.back-top.on{opacity:1;visibility:visible;transform:translateY(0)}
.chat-app{background:#fff;border:1px solid var(--line);border-radius:26px;box-shadow:var(--shadow-lg);overflow:hidden;max-width:430px;margin-left:auto}
.chat-head{background:var(--grad);color:#fff;padding:16px 18px;display:flex;align-items:center;gap:12px}
.chat-head .avatar{background:rgba(255,255,255,.24)}
.chat-head b{display:block;font-size:15.5px}
.chat-head span{font-size:12.5px;opacity:.9}
.chat-head .dots{margin-left:auto;font-size:20px;opacity:.8}
.chat-tabs{display:flex;background:#f4f8ff;border-bottom:1px solid var(--line)}
.chat-tabs label{flex:1;text-align:center;padding:11px 6px;font-size:13.5px;font-weight:700;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent}
.chat-tabs label:hover{color:var(--brand)}
#c1:checked~.chat-tabs label[for=c1],#c2:checked~.chat-tabs label[for=c2],#c3:checked~.chat-tabs label[for=c3]{color:var(--brand);border-bottom-color:var(--brand);background:#fff}
.chat-body{padding:18px;min-height:262px;background:#fbfdff}
.pane{display:none}
#c1:checked~.chat-stream .pane[data-p=c1],#c2:checked~.chat-stream .pane[data-p=c2],#c3:checked~.chat-stream .pane[data-p=c3]{display:block}
.chat-heads .chat-head{display:none}
#c1:checked~.chat-heads .chat-head[data-p=c1],#c2:checked~.chat-heads .chat-head[data-p=c2],#c3:checked~.chat-heads .chat-head[data-p=c3]{display:flex}
.msg{display:flex;gap:9px;margin-bottom:13px;align-items:flex-end}
.msg .avatar{width:32px;height:32px;flex:0 0 32px;font-size:13px}
.bubble{background:#fff;border:1px solid var(--line);padding:10px 14px;border-radius:15px 15px 15px 4px;font-size:14.4px;color:#2b3a52;max-width:76%;box-shadow:0 2px 8px rgba(15,23,42,.05)}
.msg.me{flex-direction:row-reverse}
.msg.me .bubble{background:var(--grad);color:#fff;border:none;border-radius:15px 15px 4px 15px}
.msg .time{font-size:11px;color:#9aa8bd;margin:0 4px}
.chat-input{display:flex;gap:9px;padding:13px 16px;border-top:1px solid var(--line);background:#fff;align-items:center}
.chat-input input{flex:1;border:1px solid var(--line);border-radius:12px;padding:11px 14px;font-size:14.4px;font-family:inherit;color:#26364f;background:#f9fbfe;min-width:0}
.chat-input input:focus{outline:none;border-color:var(--brand)}
.icon-btn{width:42px;height:42px;flex:0 0 42px;border-radius:12px;border:1px solid var(--line);background:#f9fbfe;cursor:pointer;font-size:18px;transition:.2s}
.icon-btn:hover{background:#eaf3ff;border-color:var(--brand)}
.chips{display:flex;gap:8px;flex-wrap:wrap;padding:0 16px 14px}
.chip{border:1px solid rgba(0,104,255,.28);background:#f2f8ff;color:var(--brand-dark);border-radius:999px;padding:7px 14px;font-size:13px;font-weight:600;cursor:pointer;font-family:inherit}
.chip:hover{background:#e2efff}
.reaction{position:absolute;font-size:26px;animation:floatUp 1.1s ease-out forwards;pointer-events:none;z-index:5}
@keyframes floatUp{0%{opacity:1;transform:translateY(0) scale(.6)}100%{opacity:0;transform:translateY(-90px) scale(1.25)}}
.reveal{opacity:1;transform:none}
html.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
html.js .reveal.in{opacity:1;transform:none}
.breadcrumb{font-size:14px;color:var(--muted);margin-bottom:18px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.breadcrumb a{color:var(--brand);font-weight:600}
.breadcrumb span.sep{color:#b8c3d4}
.page-hero{padding:126px 0 20px}
.page-hero h1{font-size:42px;margin-bottom:14px}
.page-hero p.lead{color:var(--muted);font-size:17px;max-width:720px}
.layout{display:grid;grid-template-columns:1fr 330px;gap:38px;align-items:start}
.article{background:#fff;border:1px solid var(--line);border-radius:20px;padding:38px 40px}
.article-meta{display:flex;flex-wrap:wrap;gap:16px;font-size:13.6px;color:var(--muted);margin-bottom:22px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.article h1{font-size:32px;margin-bottom:16px}
.article h2{font-size:24px;margin:34px 0 14px;padding-left:14px;border-left:5px solid var(--brand);border-radius:3px}
.article h3{font-size:19px;margin:22px 0 10px}
.article p{margin-bottom:17px;color:#33425b;font-size:16.2px;line-height:1.9}
.article figure{margin:22px 0}
.article figure img{border-radius:14px;width:100%}
.article figcaption{font-size:13.4px;color:var(--muted);text-align:center;margin-top:9px}
.quote{background:#f2f8ff;border-left:4px solid var(--brand);border-radius:0 12px 12px 0;padding:18px 22px;margin:20px 0;font-size:16px;color:#2b3a52}
.quote b{display:block;margin-top:8px;color:var(--muted);font-size:14px;font-weight:600}
.sidebar{position:sticky;top:96px;display:flex;flex-direction:column;gap:22px}
.side-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 4px 16px rgba(15,23,42,.05)}
.side-card h4{font-size:16.5px;margin-bottom:16px;padding-left:12px;border-left:4px solid var(--brand);line-height:1.2}
.toc{position:relative;padding-left:18px}
.toc:before{content:"";position:absolute;left:4px;top:6px;bottom:6px;width:2px;background:#e3ebf7}
.toc a{display:block;position:relative;padding:8px 0 8px 6px;font-size:14.4px;color:#4a5a75}
.toc a:before{content:"";position:absolute;left:-18px;top:15px;width:10px;height:10px;border-radius:50%;background:#cfdcf0;border:2px solid #fff;transition:.25s}
.toc a:hover,.toc a.active{color:var(--brand);font-weight:800}
.toc a.active:before{background:var(--brand);transform:scale(1.2)}
.hot li{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px dashed var(--line)}
.hot li:last-child{border-bottom:none}
.hot .rk{flex:0 0 26px;width:26px;height:26px;border-radius:8px;background:#e6edf8;color:#5b6b86;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;transition:.25s}
.hot li:nth-child(1) .rk{background:var(--grad);color:#fff}
.hot li:nth-child(2) .rk{background:linear-gradient(135deg,#ff9a3c,#ff6a00);color:#fff}
.hot li:nth-child(3) .rk{background:linear-gradient(135deg,#f7d15c,#e0a800);color:#fff}
.hot li:hover .rk{transform:scale(1.14)}
.hot a{font-size:14.3px;color:#33425b;font-weight:600}
.hot a:hover{color:var(--brand)}
.tags{display:flex;flex-wrap:wrap;gap:9px}
.tags a{font-size:13px;padding:7px 14px;border-radius:999px;background:#f1f6fd;color:#4a5a75;border:1px solid var(--line);font-weight:600}
.tags a:hover{background:#e2efff;color:var(--brand);border-color:var(--brand)}
.comments{margin-top:36px;border-top:1px solid var(--line);padding-top:28px}
.comments h3{font-size:20px;margin-bottom:18px}
.cmt{display:flex;gap:13px;padding:16px 0;border-bottom:1px dashed var(--line)}
.cmt:last-child{border-bottom:none}
.cmt .avatar{width:40px;height:40px;flex:0 0 40px;font-size:15px}
.cmt .top{display:flex;gap:10px;align-items:center;margin-bottom:6px;flex-wrap:wrap}
.cmt .top b{font-size:15px}
.cmt .top time{font-size:12.6px;color:#9aa8bd}
.cmt p{font-size:15px;color:#3a4a63}
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:28px 0}
.post-nav a{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;transition:.3s}
.post-nav a:hover{border-color:var(--brand);box-shadow:var(--shadow)}
.post-nav span{font-size:12.6px;color:var(--muted);display:block;margin-bottom:5px}
.post-nav b{font-size:14.6px;color:var(--ink)}
.post-nav .next{text-align:right}
.rel-title{font-size:20px;margin:30px 0 18px}
.ver-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:30px;display:flex;flex-direction:column;transition:.3s}
.ver-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(0,104,255,.3)}
.ver-card h3{font-size:20px;margin-bottom:4px}
.ver-card .num{font-size:13px;color:var(--muted);margin-bottom:16px}
.ver-card .size{font-size:14px;color:#3b4a63;margin-bottom:16px}
.ver-card .plist{flex:1}
.sys-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.sys-list .item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}
.sys-list .item b{display:block;font-size:13px;color:var(--brand);margin-bottom:7px;font-weight:800}
.sys-list .item span{font-size:15px;color:#33425b}
.steps{counter-reset:st;display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.step{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px 24px;position:relative;counter-increment:st}
.step:before{content:counter(st,decimal-leading-zero);position:absolute;top:-16px;left:24px;background:var(--grad);color:#fff;font-weight:900;font-size:15px;padding:6px 14px;border-radius:999px;box-shadow:0 8px 18px rgba(0,104,255,.3)}
.step h3{font-size:18px;margin:12px 0 8px}
.step p{color:var(--muted);font-size:14.8px}
.sitemap-list{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.sitemap-list .grp{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px}
.sitemap-list .grp h3{font-size:18px;margin-bottom:14px;padding-left:12px;border-left:4px solid var(--brand)}
.sitemap-list .grp li{padding:8px 0;border-bottom:1px dashed var(--line);font-size:15px}
.sitemap-list .grp li:last-child{border-bottom:none}
.err-wrap{min-height:80vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:140px 20px 60px}
.err-wrap .code{font-size:112px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.err-wrap h1{font-size:32px;margin:8px 0 14px}
.err-wrap p{color:var(--muted);margin-bottom:26px}
@media(max-width:992px){
.nav-menu{position:fixed;top:66px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:12px;box-shadow:0 24px 40px rgba(15,23,42,.16);border-bottom:1px solid var(--line);max-height:calc(100vh - 66px);overflow:auto;display:none}
.nav-toggle:checked~.nav-menu{display:flex}
.hamburger{display:flex;margin-left:auto}
.nav-cta{display:block;margin:14px 10px 6px}
.nav-cta .btn{width:100%}
.nav-item{border-bottom:1px solid var(--line)}
.nav-link{justify-content:space-between;padding:14px 10px}
.nav-link .arrow{display:block}
.dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;padding:0 4px 10px;min-width:0;display:block;background:transparent}
.dropdown a{padding:10px 12px;background:#f7faff}
.dropdown a:hover{background:#e9f2ff}
.hero{padding:112px 0 50px}
.hero-grid,.split,.layout{grid-template-columns:1fr}
.hero-grid{gap:38px}
.chat-app{margin:0 auto}
.hero h1{font-size:40px}
.article{padding:28px 22px}
.sidebar{position:static}
.cards-6,.cards-4,.cards-3,.stat-band,.steps,.sys-list{grid-template-columns:repeat(2,1fr)}
.foot-grid{grid-template-columns:1fr 1fr}
.sitemap-list{grid-template-columns:1fr}
}
@media(max-width:768px){
.section{padding:58px 0}
.section-head h2{font-size:29px}
.hero h1{font-size:33px}
.page-hero h1{font-size:32px}
.article h1{font-size:26px}
.cta-band{padding:40px 24px}
.cta-band h2{font-size:28px}
.stat-band{padding:38px 22px}
.stat-band b{font-size:32px}
.post-nav{grid-template-columns:1fr}
.post-nav .next{text-align:left}
}
@media(max-width:480px){
.container{padding:0 16px}
.hero h1{font-size:28px}
.hero p.lead{font-size:16.4px}
.cards-6,.cards-4,.cards-3,.stat-band,.steps,.sys-list,.foot-grid,.hero-stats{grid-template-columns:1fr}
.btn{width:100%}
.hero-actions{flex-direction:column}
.hero-actions .btn{width:100%}
.chat-app{max-width:100%}
.article{padding:22px 16px}
.err-wrap .code{font-size:78px}
}