/* Базовые переменные */
:root {
  --bg: #0b1220;
  --bg-2: #0d1a2e;
  --text: #f8fafc;
  --muted: #cbd5e1;
  --primary: #0ea5e9;
  --primary-2: #22d3ee;
  --card: #0f172a;
  --border: #1f2937;
}

/* Сброс и база */
* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1000px 400px at 20% 10%, rgba(34,211,238,.15), transparent 60%),
              radial-gradient(800px 300px at 80% 20%, rgba(14,165,233,.15), transparent 60%),
              linear-gradient(180deg, var(--bg), var(--bg-2));
}

.skip-link {
  position: absolute; left: -9999px; top: -9999px;
}
.skip-link:focus { left: 1rem; top: 1rem; background: var(--card); color: var(--text); padding: .5rem .75rem; border-radius: .5rem; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 1rem; }

/* Навигация */
.site-header { position: sticky; top: 0; backdrop-filter: saturate(180%) blur(12px); background: rgba(11,18,32,.6); border-bottom: 1px solid var(--border); z-index: 10; }
.nav { display: flex; align-items: center; justify-content: space-between; padding: .75rem 0; }
.brand { display: inline-flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--text); font-weight: 600; }
.nav-links { display: flex; align-items: center; gap: 1rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--muted); text-decoration: none; padding: .4rem .6rem; border-radius: .4rem; }
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,.06); }

/* Хиро */
.hero { padding: 5rem 0 3rem; text-align: center; }
.hero h1 { font-size: clamp(1.8rem, 3.5vw, 3rem); margin: 0 0 .75rem; }
.subtitle { color: var(--muted); max-width: 760px; margin: 0 auto 1.25rem; }
.cta { display: inline-flex; gap: .75rem; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; padding: .7rem 1rem; border-radius: .6rem; border: 1px solid var(--border); color: var(--text); text-decoration: none; }
.btn.primary { border-color: transparent; background: linear-gradient(135deg, var(--primary), var(--primary-2)); box-shadow: 0 8px 24px rgba(34,211,238,.2); }
.btn:hover { transform: translateY(-1px); transition: transform .15s ease; }

/* Секции */
.section { padding: 3rem 0; }
.cards .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.card { background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01)); border: 1px solid var(--border); border-radius: .9rem; padding: 1rem; }
.card h3 { margin-top: .2rem; }
.card p { color: var(--muted); }

/* Футер */
.site-footer { border-top: 1px solid var(--border); background: rgba(11,18,32,.6); }
.footer-grid { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 0; }
.footer-grid nav { display: inline-flex; gap: 1rem; }
.footer-grid a { color: var(--muted); text-decoration: none; }
.footer-grid a:hover { color: var(--text); }

@media (max-width: 640px) {
  .nav-links { display: none; }
  .footer-grid { flex-direction: column; align-items: flex-start; }
}