:root{
  --navy:#0f172a;--blue:#1976d2;--green:#16a05c;--green-deep:#0b5e35;--green-ink:#0c7a45;--muted:#64748b;--line:#d9e9e0;--bg:#f4fbf7;--card:#fff;
}
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(max-width:900px){.site-header{height:auto;padding:14px 18px}.nav-toggle{display:flex}.nav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:rgba(255,255,255,.98);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);padding:6px 0;box-shadow:0 14px 30px rgba(15,23,42,.1)}.nav.open{display:flex}.nav a{padding:13px 22px;border-top:1px solid #eef3f6}.mobile-cta{display:flex}body.has-mobile-cta{padding-bottom:80px}.hero,.concept-grid,.product{grid-template-columns:1fr}.phone-stage{min-height:560px}.phone{border-width:6px}.flow,.why-grid,.cards{grid-template-columns:1fr}.feature-list{grid-template-columns:1fr}.cta{flex-direction:column;align-items:flex-start}.footer{flex-direction:column;align-items:flex-start}}@media (max-width:640px){.hero{padding-top:46px}.phone-stage{min-height:460px}.phone-left{left:0;width:34%;top:60px}.phone-center{left:28%;width:40%;top:0}.phone-right{right:0;width:34%;top:60px}.brand 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