/* Mobile-first dark header, responsive layout */
:root { --maxw: 1100px; --rad: 14px; --shadow: 0 10px 30px rgba(0,0,0,.2); }
* { box-sizing: border-box; }
html, body { margin:0; padding:0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; color:#111; background:#fff; }
a { text-decoration: none; color: inherit; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

/* Header on black */
.site-header { position: sticky; top:0; background:#000; border-bottom:1px solid #111; z-index: 10; }
.nav { display:flex; align-items:center; justify-content:space-between; height:64px; }
.brand-logo { display:block; }
.brand-fallback { color:#fff; font-weight:800; font-size:18px; }
.main-nav { display:flex; gap:16px; background:#000; }
.main-nav a { color:#fff; font-weight:600; padding:10px 12px; }
.nav .cta { border:1px solid #333; border-radius:10px; }
.hamburger { display:inline-flex; flex-direction:column; gap:4px; background:transparent; border:0; padding:8px; cursor:pointer; }
.hamburger span { display:block; width:22px; height:2px; background:#fff; }

/* Mobile nav (slide-down) */
.main-nav { position:fixed; inset:64px 0 auto 0; transform: translateY(-120%); transition: transform .25s ease; padding:12px 16px; border-bottom:1px solid #111; }
.nav-open .main-nav { transform: translateY(0); }

@media (min-width: 860px) {
  .hamburger { display:none; }
  .main-nav { position:static; transform:none; padding:0; border:0; }
}

/* Hero */
.hero { padding: 56px 0 28px; background: linear-gradient(180deg, #0b0b0b 0%, #0b0b0b 0%, #ffffff 60%); }
.hero-inner { text-align:center; }
.hero h1 { color:#fff; font-size: clamp(26px, 5vw, 44px); margin: 0 0 10px; letter-spacing:-0.02em; }
.lead { font-size: 17px; color:#e5e5e7; max-width:800px; margin: 0 auto 18px; }
.actions { display:flex; gap:12px; justify-content:center; margin-top:8px; flex-wrap:wrap; }
.btn { display:inline-block; padding:12px 18px; border-radius:12px; border:1px solid #ddd; }
.btn.primary { background:#fff; color:#000; border-color:#fff; }

.demo-video { margin: 22px auto 0; }
.demo-video video { width:100%; max-width: 980px; border-radius:12px; box-shadow: var(--shadow); display:block; background:#000; }

/* Sections */
.section { padding: 56px 0; }
.section.alt { background:#fafbff; }
.cards { display:grid; grid-template-columns: 1fr; gap:16px; }
.card { background:#fff; border:1px solid #eee; border-radius: var(--rad); padding:20px; box-shadow: var(--shadow); }
.two-col { display:grid; grid-template-columns: 1fr; gap:20px; align-items:start; }
.highlight { background:#fff; border:1px solid #eee; border-radius: var(--rad); padding:20px; box-shadow: var(--shadow); }
.tick { padding-left: 18px; }
.tick li { margin: 8px 0; }

/* Desktop grids */
@media (min-width: 900px) {
  .cards { grid-template-columns: repeat(3, 1fr); }
  .two-col { grid-template-columns: 1.1fr 0.9fr; gap:24px; }
}

/* Contact */
.contact .fields { display:grid; grid-template-columns: 1fr; gap:12px; margin: 12px 0 16px; }
.contact input, .contact textarea { width:100%; padding:12px 14px; border-radius:12px; border:1px solid #ddd; }
.contact textarea { resize: vertical; min-height: 120px; }

/* Footer */
.site-footer { border-top: 1px solid #eee; background:#fff; }
.foot { display:flex; gap:20px; align-items:center; justify-content:center; height:64px; color:#666; }