:root{
  --bg:#0b1220;--card:#0f172a;--muted:#94a3b8;--text:#e2e8f0;--brand:#7c3aed;--brand-2:#22d3ee;--ok:#10b981;--err:#ef4444;
  --ring: rgba(124,58,237,.3);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:linear-gradient(180deg,#0b1220, #0a1020 40%, #0b1220);color:var(--text);line-height:1.6}
a{color:#c4b5fd;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block;border-radius:1rem}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.site-header{position:sticky;top:0;background:rgba(10,16,32,.7);backdrop-filter: blur(8px);border-bottom:1px solid rgba(255,255,255,.06);z-index:10}
.header-inner{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:14px 0}
.logo{display:inline-flex;gap:10px;align-items:center;font-weight:700;font-size:20px}
.logo img{width:28px;height:28px}
.main-nav{display:flex;gap:18px;align-items:center}
.header-actions{display:flex;gap:12px;align-items:center}
.search{display:flex;gap:8px}
.search input{border:1px solid rgba(255,255,255,.1);background:transparent;color:var(--text);padding:10px 12px;border-radius:.8rem;outline:none}
.search input:focus{border-color:var(--ring);box-shadow:0 0 0 4px var(--ring)}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;border-radius:1rem;border:1px solid transparent;cursor:pointer;font-weight:600}
.btn-primary{background:linear-gradient(90deg,var(--brand),var(--brand-2));color:#0b1220}
.btn-secondary{background:#111827;color:#fff;border-color:#1f2937}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.14);color:#fff}
.btn:active{transform:translateY(1px)}
.cart-link{display:inline-flex;gap:6px;align-items:center;position:relative}
.cart-count{background:var(--ok);color:#001b2e;border-radius:999px;padding:2px 6px;font-size:12px;position:absolute;top:-8px;right:-10px}
.hero{padding:36px 0 22px;border-bottom:1px solid rgba(255,255,255,.06)}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:center}
.hero-text h1{font-size:46px;line-height:1.1;margin:.2em 0 .2em}
.grad{background:linear-gradient(90deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-actions{display:flex;gap:12px;margin:16px 0}
.hero-bullets{display:grid;grid-auto-flow:column;gap:18px;padding:0;margin:14px 0 0;list-style:none;color:var(--muted)}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;padding:28px 0}
.features article{background:var(--card);padding:18px;border-radius:1.2rem;border:1px solid rgba(255,255,255,.06)}
.features h3{margin:10px 0 4px}
.link{display:inline-block;margin-top:6px}
.grid{display:grid;gap:18px}
.products-preview{grid-template-columns:repeat(4,1fr);padding:10px 0 28px}
.card{background:var(--card);padding:16px;border-radius:1.2rem;border:1px solid rgba(255,255,255,.06);display:flex;flex-direction:column}
.card .info{display:flex;flex-direction:column;gap:6px;margin-top:10px}
.price{font-size:20px;font-weight:700}
.badge{display:inline-flex;align-items:center;gap:6px;background:#0b1220;border:1px solid rgba(255,255,255,.08);padding:4px 8px;border-radius:999px;font-size:12px}
.page-header{padding:18px 0 10px;border-bottom:1px solid rgba(255,255,255,.06);margin-bottom:16px}
.catalog-grid{grid-template-columns:repeat(3,1fr);padding-bottom:30px}
.filters{display:flex;gap:12px;margin-top:10px}
.product{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;padding:20px 0}
.product .title{font-size:32px;margin:.2em 0 .1em}
.product .buy{display:flex;align-items:center;justify-content:space-between;background:var(--card);padding:16px;border-radius:1.2rem;border:1px solid rgba(255,255,255,.06)}
.product .specs{background:var(--card);padding:16px;border-radius:1.2rem;border:1px solid rgba(255,255,255,.06);margin-top:14px}
.builder{display:grid;gap:16px;padding:8px 0 26px}
.builder-row{display:grid;grid-template-columns:220px 1fr;gap:12px;align-items:center;background:var(--card);padding:12px;border-radius:1.2rem;border:1px solid rgba(255,255,255,.06)}
.builder-summary{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}
.build-list{margin:0;padding-left:18px}
.banner{padding:6px 0 40px}
.banner-inner{background:linear-gradient(90deg,rgba(124,58,237,.25),rgba(34,211,238,.25));border:1px dashed rgba(255,255,255,.2);padding:24px;border-radius:1.2rem;text-align:center}
.site-footer{border-top:1px solid rgba(255,255,255,.06);padding:24px 0;margin-top:30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:16px}
.subscribe-row{display:flex;gap:8px}
.subscribe-row input{flex:1;border:1px solid rgba(255,255,255,.1);background:transparent;color:var(--text);padding:10px 12px;border-radius:.8rem;outline:none}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.contacts{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.contacts-card{background:var(--card);padding:18px;border-radius:1.2rem;border:1px solid rgba(255,255,255,.06)}
.cart .item{display:grid;grid-template-columns:100px 1fr 272px;gap:12px;background:var(--card);padding:12px;border-radius:1.2rem;border:1px solid rgba(255,255,255,.06);align-items:center}
.cart .qty{display:flex;gap:8px;align-items:center}
.cart .sum{font-weight:700}
.empty{border:1px dashed rgba(255,255,255,.2);padding:20px;border-radius:1.2rem;text-align:center}
.card a img{height: 150px;}
.sum{font-size: 11px;}
#agree{width: 5%;}
@media (max-width: 980px){
  .hero-inner{grid-template-columns:1fr}
  .products-preview{grid-template-columns:repeat(2,1fr)}
  .catalog-grid{grid-template-columns:repeat(2,1fr)}
  .product{grid-template-columns:1fr}
  .builder-row{grid-template-columns:1fr}
  .builder-summary{grid-template-columns:1fr}
  .about-grid, .contacts{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
/* ==== Адаптивная верстка ==== */

/* Планшеты до 980px */
@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-text h1 {
    font-size: 32px;
  }
  .features {
    grid-template-columns: 1fr 1fr;
  }
  .products-preview {
    grid-template-columns: 1fr 1fr;
  }
  .catalog-grid {
    grid-template-columns: 1fr 1fr;
  }
  .about-grid,
  .contacts {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .order-form {
    padding: 0 10px;
  }
}

/* Смартфоны до 600px */
@media (max-width: 600px) {
  .site-header .header-inner {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }
  .main-nav {
    flex-wrap: wrap;
    gap: 10px;
    font-size: 14px;
  }
  .search {
    width: 100%;
  }
  .search input {
    flex: 1;
    width: 100%;
  }
  .features {
    grid-template-columns: 1fr;
  }
  .products-preview,
  .catalog-grid {
    grid-template-columns: 1fr;
  }
  .hero-text h1 {
    font-size: 26px;
  }
  .card {
    padding: 12px;
  }
  .builder-row {
    grid-template-columns: 1fr;
  }
  .builder-summary {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .order-form input,
  .order-form textarea {
    font-size: 14px;
    padding: 10px 12px;
  }
  .order-form label {
    font-size: 14px;
  }
}