:root{--indigo:#4f46e5;--violet:#7c3aed;--cyan:#06b6d4;--navy:#0b1020;--ink:#0f172a;--slate:#475569;--line:#e2e8f0;--bg:#f8faff;--card:#fff;--ok:#10b981;--warn:#f59e0b}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px;top:0;background:#fff;padding:8px 14px;z-index:999}
.skip:focus{left:10px;top:10px}
/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.brand img{width:28px;height:28px;border-radius:6px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{font-size:14.5px;font-weight:600;color:var(--slate)}
.nav-links a:hover{color:var(--indigo)}
.nav-cta{display:flex;align-items:center;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:10px;font-weight:700;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.2s}
.btn-primary{background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;box-shadow:0 6px 18px rgba(79,70,229,.28)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 26px rgba(79,70,229,.4)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--indigo);color:var(--indigo)}
.btn-cyan{background:linear-gradient(135deg,#0891b2,var(--cyan));color:#fff}
.btn-lg{padding:14px 30px;font-size:16px}
/* hero */
.hero{background:radial-gradient(1200px 600px at 80% -10%,rgba(124,58,237,.18),transparent 60%),radial-gradient(900px 500px at 10% 10%,rgba(6,182,212,.14),transparent 55%),var(--navy);color:#fff;padding:64px 0 80px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:42px;line-height:1.2;font-weight:800;margin:14px 0 18px}
.hero h1 .grad{background:linear-gradient(90deg,#8b5cf6,#22d3ee);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:17px;color:#cbd5e1;max-width:540px;margin-bottom:26px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.hero-meta{display:flex;gap:22px;flex-wrap:wrap;font-size:13.5px;color:#94a3b8}
.hero-meta span{display:flex;align-items:center;gap:6px}
.badge{display:inline-block;background:rgba(139,92,246,.18);color:#c4b5fd;border:1px solid rgba(139,92,246,.4);padding:5px 12px;border-radius:999px;font-size:13px;font-weight:600}
/* simulator */
.sim{background:#fff;border-radius:16px;box-shadow:0 30px 70px rgba(0,0,0,.35);overflow:hidden;color:var(--ink)}
.sim-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:#f1f5f9;border-bottom:1px solid var(--line)}
.sim-dot{width:11px;height:11px;border-radius:50%}
.sim-title{margin-left:6px;font-size:13px;font-weight:700;color:var(--slate)}
.sim-body{padding:22px}
.sim-status{display:flex;align-items:center;justify-content:space-between;background:#eef2ff;border:1px solid #e0e7ff;border-radius:12px;padding:16px;margin-bottom:18px}
.sim-status .loc{font-weight:800;font-size:16px}
.sim-status .ip{font-size:12.5px;color:var(--slate);margin-top:2px}
.sim-pill{background:#10b981;color:#fff;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px}
.sim-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid #f1f5f9;font-size:14px}
.sim-row b{font-weight:700}
.sim-connect{margin-top:18px;width:100%;justify-content:center}
.sim-lock{display:flex;align-items:center;gap:8px;justify-content:center;font-size:13px;color:var(--slate);margin-top:12px}
/* section */
.section{padding:72px 0}
.section-head{max-width:680px;margin:0 auto 44px;text-align:center}
.section-head .kicker{color:var(--indigo);font-weight:700;font-size:14px;letter-spacing:.5px;text-transform:uppercase}
.section-head h2{font-size:32px;font-weight:800;margin:10px 0 14px}
.section-head p{color:var(--slate);font-size:16px}
/* notice */
.notice{background:linear-gradient(135deg,#fff7ed,#fef2f2);border:1px solid #fde0c8}
.notice-box{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid #ffe4c4;border-left:4px solid var(--warn);border-radius:12px;padding:18px 20px;margin-bottom:14px}
.notice-box .ic{font-size:20px}
.notice-box b{display:block;margin-bottom:2px}
.notice-box p{font-size:14px;color:var(--slate)}
/* cards */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;transition:.2s}
.card:hover{box-shadow:0 14px 34px rgba(15,23,42,.08);transform:translateY(-3px)}
.card .ic{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:16px}
.ic-indigo{background:#eef2ff;color:var(--indigo)}
.ic-violet{background:#f5f3ff;color:var(--violet)}
.ic-cyan{background:#ecfeff;color:#0891b2}
.ic-green{background:#ecfdf5;color:var(--ok)}
.card h3{font-size:18px;font-weight:800;margin-bottom:8px}
.card p{font-size:14.5px;color:var(--slate)}
/* selling */
.sell{display:flex;gap:20px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;margin-bottom:18px}
.sell .num{flex-shrink:0;width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center}
.sell h3{font-size:18px;margin-bottom:6px}
.sell p{font-size:14.5px;color:var(--slate)}
/* compare table */
.cmp{overflow-x:auto}
.cmp table{width:100%;border-collapse:collapse;background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 8px 30px rgba(15,23,42,.06)}
.cmp th,.cmp td{padding:16px 18px;text-align:left;font-size:14.5px;border-bottom:1px solid var(--line)}
.cmp thead th{background:var(--navy);color:#fff;font-weight:700}
.cmp thead th.hl{background:linear-gradient(135deg,var(--indigo),var(--violet))}
.cmp td.hl{background:#eef2ff;font-weight:700}
.cmp .yes{color:var(--ok);font-weight:700}
.cmp .no{color:#94a3b8}
/* tabs */
.tabs{display:flex;gap:8px;justify-content:center;margin-bottom:28px;flex-wrap:wrap}
.tab{padding:9px 20px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:14px;font-weight:600;color:var(--slate)}
.tab.active,.tab:hover{background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;border-color:transparent}
/* news cards */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.2s}
.news-card:hover{box-shadow:0 14px 30px rgba(15,23,42,.09);transform:translateY(-3px)}
.news-card .thumb{height:150px;background:linear-gradient(135deg,var(--indigo),var(--violet));display:flex;align-items:center;justify-content:center}
.news-card .thumb svg{width:100%;height:100%}
.news-card .body{padding:18px}
.news-card .tag{font-size:12px;color:var(--indigo);font-weight:700}
.news-card h3{font-size:16px;font-weight:800;margin:8px 0;line-height:1.4}
.news-card h3 a:hover{color:var(--indigo)}
.news-card .date{font-size:12.5px;color:var(--slate)}
/* reviews */
.review{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px}
.review .stars{color:#f59e0b;font-size:16px;margin-bottom:10px}
.review p{font-size:15px;color:var(--slate)}
.review .user{display:flex;align-items:center;gap:12px;margin-top:16px}
.review .avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,var(--indigo),var(--cyan));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800}
.review .user b{display:block;font-size:14.5px}
.review .user span{font-size:12.5px;color:var(--slate)}
/* download platforms */
.platforms{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.plat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 14px;text-align:center;transition:.2s}
.plat:hover{box-shadow:0 12px 26px rgba(15,23,42,.09);transform:translateY(-3px)}
.plat .pic{font-size:34px;margin-bottom:10px}
.plat b{display:block;font-size:15px;margin-bottom:12px}
/* trust */
.trust{background:var(--navy);color:#fff}
.trust .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.trust .num{font-size:34px;font-weight:800;background:linear-gradient(90deg,#8b5cf6,#22d3ee);-webkit-background-clip:text;background-clip:text;color:transparent}
.trust .lbl{font-size:14px;color:#94a3b8;margin-top:6px}
/* scenario */
.scenario{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.scen-tag{padding:11px 22px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:14.5px;font-weight:600}
.scen-tag:hover{border-color:var(--indigo);color:var(--indigo)}
/* faq */
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;overflow:hidden}
.faq-q{padding:20px 24px;font-weight:700;font-size:16px;display:flex;justify-content:space-between;align-items:center;cursor:pointer}
.faq-q .arrow{transition:.2s;color:var(--slate)}
.faq-a{padding:0 24px 22px;color:var(--slate);font-size:15px;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .arrow{transform:rotate(180deg)}
.faq-a ol{margin-left:20px}
.faq-a ol li{margin-bottom:10px}
/* breadcrumb */
.crumb{font-size:13.5px;color:var(--slate);padding:18px 0;border-bottom:1px solid var(--line)}
.crumb a{color:var(--indigo)}
.crumb span{margin:0 6px;color:#cbd5e1}
/* article */
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:40px;padding:40px 0 60px}
.article-main h1{font-size:30px;font-weight:800;line-height:1.3;margin:14px 0}
.article-meta{display:flex;gap:18px;font-size:13.5px;color:var(--slate);margin-bottom:24px;flex-wrap:wrap}
.article-meta .cat{color:var(--indigo);font-weight:700}
.article-main figure{margin:24px 0}
.article-main figure img{border-radius:14px;width:100%}
.article-main figure figcaption{font-size:12.5px;color:var(--slate);text-align:center;margin-top:8px}
.article-main h2{font-size:22px;font-weight:800;margin:32px 0 14px;padding-left:12px;border-left:4px solid var(--indigo)}
.article-main p{margin-bottom:16px;color:#334155;font-size:15.5px}
.article-main blockquote{border-left:4px solid var(--cyan);background:#ecfeff;padding:16px 20px;border-radius:0 12px 12px 0;margin:20px 0;color:var(--slate);font-style:italic}
.article-main .toc{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:20px;margin:20px 0}
.article-main .toc b{display:block;margin-bottom:10px}
.article-main .toc a{display:block;padding:5px 0;color:var(--indigo);font-size:14.5px}
.sidebar{position:sticky;top:80px;align-self:start}
.side-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;margin-bottom:20px}
.side-card h4{font-size:16px;font-weight:800;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--line)}
.side-card ul{list-style:none}
.side-card ul li{margin-bottom:10px}
.side-card ul li a{font-size:14px;color:var(--slate);line-height:1.4}
.side-card ul li a:hover{color:var(--indigo)}
.side-card .hot-num{color:var(--indigo);font-weight:800;margin-right:6px}
.cat-link{display:inline-block;padding:6px 14px;border:1px solid var(--line);border-radius:999px;font-size:13px;margin:4px 4px 0 0;color:var(--slate)}
.cat-link:hover{border-color:var(--indigo);color:var(--indigo)}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:32px;border-top:1px solid var(--line);padding-top:22px}
.pager a{font-size:14.5px;font-weight:600;color:var(--indigo)}
.pager a.muted{color:#94a3b8}
.back-list{display:inline-block;margin-top:22px;font-size:14.5px;font-weight:700;color:var(--indigo)}
/* cta */
.cta{background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;border-radius:20px;padding:50px;text-align:center;margin:60px 0}
.cta h2{font-size:30px;font-weight:800;margin-bottom:12px}
.cta p{color:#e0e7ff;margin-bottom:24px}
.cta .btn{background:#fff;color:var(--indigo)}
/* footer */
.footer{background:var(--navy);color:#cbd5e1;padding:56px 0 30px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer ul{list-style:none}
.footer ul li{margin-bottom:10px}
.footer ul li a{font-size:14px;color:#94a3b8}
.footer ul li a:hover{color:#fff}
.footer .brand-txt{font-size:13.5px;color:#94a3b8;margin-top:12px;max-width:280px}
.footer-bottom{border-top:1px solid #1e293b;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:#64748b}
.footer-bottom a{color:#94a3b8}
.sitemap-link{font-size:13px;color:#64748b;margin-top:6px;display:inline-block}
/* page hero (subpages) */
.page-hero{background:radial-gradient(900px 500px at 80% -10%,rgba(124,58,237,.2),transparent 60%),var(--navy);color:#fff;padding:60px 0}
.page-hero h1{font-size:34px;font-weight:800;margin:10px 0 14px}
.page-hero p{color:#cbd5e1;max-width:640px}
/* steps */
.steps{counter-reset:step}
.step{position:relative;padding:22px 24px 22px 78px;background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px}
.step::before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:22px;width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:17px}
.step h3{font-size:16px;margin-bottom:6px}
.step p{font-size:14.5px;color:var(--slate)}
@media(max-width:960px){.hero-grid,.article-layout{grid-template-columns:1fr}.grid-3,.news-grid{grid-template-columns:1fr 1fr}.platforms{grid-template-columns:repeat(3,1fr)}.trust .grid-4{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.nav-links{display:none}}
@media(max-width:640px){.grid-3,.grid-2,.news-grid{grid-template-columns:1fr}.platforms{grid-template-columns:1fr 1fr}.hero h1{font-size:30px}.section-head h2{font-size:26px}}