:root{--bg:#f5f7fb;--bg2:#eef2f9;--fg:#0e1726;--muted:#60708a;--brand:#4169e1;--brand2:#7c3aed;--accent:#00d4ff;--surface:#ffffff;--surface-strong:#e6ecf7;--ok:#16a34a;--warn:#f59e0b}
[data-theme="dark"]{--bg:#0f172a;--bg2:#1e293b;--fg:#e2e8f0;--muted:#94a3b8;--brand:#818cf8;--brand2:#a78bfa;--surface:#1e293b;--surface-strong:#334155;color-scheme:dark}
[data-theme="dark"] body::before{opacity:.03}
[data-theme="dark"] header{background:linear-gradient(180deg,rgba(15,23,42,.85),rgba(15,23,42,.6))}
[data-theme="dark"] .card{background:var(--surface)}
[data-theme="dark"] .nav-links a{background:var(--surface)}
[data-theme="dark"] .panel{background:rgba(15,23,42,.7)}
[data-theme="dark"] .trust-item{background:var(--surface)}
[data-theme="dark"] .compare-row{background:var(--surface)}
[data-theme="dark"] .compare-row:nth-child(even){background:rgba(30,41,59,.6)}
[data-theme="dark"] .step{background:var(--surface)}
[data-theme="dark"] .faq-item{background:var(--surface)}
[data-theme="dark"] .badge{background:var(--surface)}
[data-theme="dark"] .cta-banner{background:linear-gradient(135deg,rgba(129,140,248,.1),rgba(167,139,250,.1))}
[data-theme="dark"] .platform-card{background:linear-gradient(var(--surface),var(--surface)) padding-box,linear-gradient(135deg,rgba(129,140,248,.35),rgba(167,139,250,.35)) border-box}
[data-theme="dark"] .compare-head{background:linear-gradient(90deg,rgba(129,140,248,.08),rgba(167,139,250,.08))}
[data-theme="dark"] .btn-ghost{background:var(--surface)}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"Noto Sans",sans-serif;color:var(--fg);background:linear-gradient(180deg,var(--bg),var(--bg2))}
body::before{content:"";position:fixed;inset:0;pointer-events:none;background-image:radial-gradient(var(--brand) 1px, transparent 1px),radial-gradient(var(--brand2) 1px, transparent 1px);background-size:40px 40px;opacity:.06;animation:bgShift 24s linear infinite}
@keyframes bgShift{0%{transform:translate3d(0,0,0)}100%{transform:translate3d(-40px,-40px,0)}}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
header{position:sticky;top:0;z-index:50;backdrop-filter:saturate(1.6) blur(8px);background:linear-gradient(180deg,rgba(255,255,255,.85),rgba(255,255,255,.6));border-bottom:1px solid var(--surface-strong)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand-link{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--fg)}
.brand-name{font-weight:800;letter-spacing:-.01em;white-space:nowrap;font-size:1.2rem}
.logo{width:28px;height:28px}
.nav-links a{display:inline-flex;align-items:center;color:var(--fg);text-decoration:none;margin:0 6px;font-weight:600;padding:8px 12px;border:1px solid var(--surface-strong);border-radius:999px;background:#fff}
.nav-links a:hover{background:rgba(65,105,225,.08);border-color:#d9e2f2}
.nav .cta{background:linear-gradient(90deg,var(--brand),var(--brand2));padding:10px 16px;border-radius:999px;color:#fff;box-shadow:0 8px 20px rgba(65,105,225,.25)}
.hero{position:relative;overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center;padding:68px 0}
.headline{font-size:44px;line-height:1.15;font-weight:800;letter-spacing:-.02em}
.sub{color:var(--muted);font-size:18px;margin-top:14px}
.hero-cta{display:flex;gap:12px;margin-top:20px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:12px;text-decoration:none;transition:transform .18s ease,box-shadow .18s ease}
.btn-primary{background:linear-gradient(90deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 10px 24px rgba(65,105,225,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(65,105,225,.35)}
.btn-ghost{background:#fff;border:1px solid var(--surface-strong);color:var(--fg)}
.visual{position:relative;height:360px;border-radius:20px;background:linear-gradient(135deg,rgba(65,105,225,.18),rgba(124,58,237,.18));border:1px solid var(--surface-strong);box-shadow:0 16px 40px rgba(65,105,225,.12)}
.visual::before{content:"";position:absolute;left:0;right:0;height:2px;top:0;background:linear-gradient(90deg,transparent,rgba(124,58,237,.5),transparent);animation:scan 6s linear infinite}
@keyframes scan{0%{top:0}100%{top:100%}}
.blob{position:absolute;filter:blur(40px);opacity:.6}
.blob.b1{top:-40px;left:-30px;width:280px;height:280px;background:radial-gradient(closest-side,rgba(65,105,225,.75),transparent)}
.blob.b2{bottom:-50px;right:-30px;width:340px;height:340px;background:radial-gradient(closest-side,rgba(124,58,237,.75),transparent)}
.panel{position:absolute;inset:18px;border-radius:14px;background:rgba(255,255,255,.7);border:1px solid var(--surface-strong);display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:18px}
.card{background:#fff;border:1px solid var(--surface-strong);border-radius:14px;padding:16px;box-shadow:0 8px 22px rgba(14,23,38,.06);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(14,23,38,.12);border-color:#dbe6f7}
.card h3{margin:0;font-size:18px}
.card p{margin:10px 0 0;color:var(--muted)}
.section{padding:56px 0;border-top:1px solid var(--surface-strong)}
.section h2{margin:0 0 16px;font-size:28px}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid.grid-compact{grid-template-columns:repeat(3,1fr)}
.cards .card{display:flex;flex-direction:column;min-height:200px}
.card .desc{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;line-clamp:3;box-orient:vertical}
.feature{background:#fff;border:1px solid var(--surface-strong);border-radius:14px;padding:18px}
.feature .k{font-weight:800;margin-bottom:6px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.faq{display:grid;grid-template-columns:1fr;gap:12px}
.faq-item{border:1px solid var(--surface-strong);border-radius:14px;background:#fff}
.faq-item button{width:100%;text-align:left;background:transparent;border:0;color:var(--fg);padding:16px 18px;font-size:16px;font-weight:800;display:flex;align-items:center;justify-content:space-between}
.faq-item .a{height:0;overflow:hidden;will-change:height;transition:height .26s cubic-bezier(.2,.6,.2,1),padding .26s cubic-bezier(.2,.6,.2,1),opacity .26s cubic-bezier(.2,.6,.2,1);padding:0 18px 0;color:var(--muted);opacity:0}
.faq-item.open .a{padding:0 18px 16px;opacity:1}
.stat{display:flex;align-items:center;gap:8px;margin-top:12px;color:var(--muted);font-size:14px}
.badge{display:inline-flex;align-items:center;gap:8px;border-radius:999px;border:1px solid var(--surface-strong);background:#fff;padding:6px 10px;color:var(--muted);font-size:13px}
footer{padding:30px 0;color:var(--muted);border-top:1px solid var(--surface-strong)}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
.reveal.visible{opacity:1;transform:none}
@media (max-width:900px){.hero-inner{grid-template-columns:1fr}.features{grid-template-columns:1fr 1fr}.grid2{grid-template-columns:1fr}.visual{height:280px}.headline{font-size:36px}}
.platform-card{position:relative;overflow:hidden;border:1px solid transparent;background:linear-gradient(#fff,#fff) padding-box,linear-gradient(135deg,rgba(65,105,225,.35),rgba(124,58,237,.35)) border-box}
.platform-card:hover{background:linear-gradient(#fff,#fff) padding-box,linear-gradient(135deg,rgba(65,105,225,.5),rgba(124,58,237,.5)) border-box}
.os-row{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.os-icon{width:26px;height:26px;filter:drop-shadow(0 4px 10px rgba(65,105,225,.2))}
.btn-wide{width:100%;justify-content:center;margin-top:10px}
.tagline{color:var(--muted);font-size:14px}
body.theme-x{--brand:#0ea5e9;--brand2:#22c55e;--bg:#f0f9ff;--bg2:#ecfdf5}
body.theme-verge{--brand:#7c3aed;--brand2:#06b6d4;--bg:#f6f3ff;--bg2:#e8fbff}
body.theme-x .visual{background:linear-gradient(135deg,rgba(14,165,233,.18),rgba(34,197,94,.18))}
body.theme-verge .visual{background:linear-gradient(135deg,rgba(124,58,237,.18),rgba(6,182,212,.18))}
.btn-ghost:hover{background:rgba(65,105,225,.06);border-color:#d0daf0}
.trust-row{display:flex;gap:24px;margin-top:18px;flex-wrap:wrap}
.trust-item{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--muted);background:#fff;border:1px solid var(--surface-strong);border-radius:999px;padding:6px 14px}
.trust-item:first-child{background:linear-gradient(90deg,rgba(65,105,225,.08),rgba(124,58,237,.08));border-color:rgba(124,58,237,.2);color:var(--brand);font-weight:700}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{background:#fff;border:1px solid var(--surface-strong);border-radius:16px;padding:24px;text-align:center;position:relative}
.step-num{width:36px;height:36px;margin:0 auto 12px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px}
.step h3{margin:0 0 8px;font-size:18px}
.step p{margin:0;color:var(--muted);font-size:14px;line-height:1.6}
.step a{color:var(--brand);font-weight:600;text-decoration:none}
.compare{overflow-x:auto}
.compare-table{border-radius:14px;border:1px solid var(--surface-strong);overflow:hidden;min-width:600px}
.compare-head,.compare-row{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;padding:14px 18px;font-size:14px}
.compare-head{background:linear-gradient(90deg,rgba(65,105,225,.06),rgba(124,58,237,.06));font-weight:800;color:var(--fg)}
.compare-row{border-top:1px solid var(--surface-strong);background:#fff}
.compare-row:nth-child(even){background:#fafbfd}
.compare-row .hl{color:var(--brand);font-weight:600}
.compare-head .hl{color:var(--brand)}
.cta-banner{background:linear-gradient(135deg,rgba(65,105,225,.08),rgba(124,58,237,.08));border:1px solid var(--surface-strong);border-radius:20px;padding:40px 24px}
.cta-banner h2{margin:0 0 8px;font-size:28px}
.cta-banner p{color:var(--muted);margin:0 0 20px;font-size:16px}
.footer-disclaimer{font-size:13px;color:var(--muted);margin-bottom:8px;padding-bottom:12px;border-bottom:1px solid var(--surface-strong)}
@media (max-width:700px){.steps{grid-template-columns:1fr}.trust-row{gap:8px}}
#theme-toggle{background:var(--surface);border:1px solid var(--surface-strong);border-radius:50%;width:36px;height:36px;cursor:pointer;font-size:16px;display:inline-flex;align-items:center;justify-content:center;color:var(--fg);flex-shrink:0;transition:background .2s;margin-left:4px}
#theme-toggle:hover{background:var(--surface-strong)}
#back-to-top{position:fixed;bottom:24px;right:24px;z-index:99;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:none;cursor:pointer;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s,transform .2s;box-shadow:0 4px 16px rgba(65,105,225,.3);font-size:18px;display:flex;align-items:center;justify-content:center}
#back-to-top.visible{opacity:1;visibility:visible}
#back-to-top:hover{transform:translateY(-2px)}