/* Prototype styles - metallic/white theme */
:root {
  /* Light (metal/white) palette */
  --bg: #F7F8FA;
  --surface: #FFFFFF;
  --surface-2: #F2F4F7;
  --text: #0A0A0A;
  --text-muted: #4A4F55;
  --steel-1: #C9CED3;
  --steel-2: #FFFFFF;
  --steel-shadow: rgba(0,0,0,0.12);
  --blue-steel: #8FA6BC;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: radial-gradient(1200px 1200px at 50% 0%, rgba(255,255,255,0.9), transparent 60%), var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial, sans-serif;
}

.grid-bg::before {
  content: '';
  position: fixed; inset: 0; z-index: -1;
  background-image: linear-gradient(rgba(0,0,0,0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(0,0,0,0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.container { width: min(1120px, 92vw); margin: 0 auto; }

.metal-stroke {
  border: 1px solid transparent;
  background: linear-gradient(var(--surface), var(--surface)) padding-box,
              linear-gradient(180deg, var(--steel-2), var(--steel-1)) border-box;
  border-radius: 16px;
}

/* Header */
.header {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(140%) blur(6px);
  background: rgba(255,255,255,0.7);
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 14px 60px; }

@media (max-width: 770px) {
  .nav { padding: 14px 20px; }
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); }
.brand-logo { width: 36px; height: 36px; border-radius: 9px; background: var(--surface-2); box-shadow: 0 0 10px var(--steel-shadow) inset; }
.brand-title { font-weight: 800; letter-spacing: .14em; }
.nav-links { display: flex; gap: 18px; }
.nav-link { color: var(--text); text-decoration: none; opacity: .8; }
.nav-link:hover { opacity: 1; text-shadow: 0 0 14px var(--steel-shadow); }

/* Hero */
.hero { padding: 96px 0 72px; position: relative; }
.title { font-size: clamp(36px, 6vw, 64px); font-weight: 800; letter-spacing: .16em; margin: 0 0 12px; }
.subtitle { font-size: clamp(14px, 2.4vw, 18px); color: var(--text-muted); letter-spacing: .24em; text-transform: uppercase; margin: 0 0 28px; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary { padding: 12px 18px; color: var(--text); text-decoration: none; background: var(--surface); border-radius: 12px; box-shadow: 0 8px 18px var(--steel-shadow); border: 1px solid rgba(0,0,0,0.06); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 24px var(--steel-shadow); }
.btn-secondary { padding: 12px 18px; text-decoration: none; color: var(--text); }

/* Tech cards */
.tech { padding: 48px 0 84px; }
.tech-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.tech-card { background: var(--surface); padding: 18px; border-radius: 16px; box-shadow: 0 10px 24px rgba(0,0,0,.08), inset 0 1px 0 rgba(255,255,255,.6); transition: transform .25s ease, box-shadow .25s ease; }
.tech-card:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(0,0,0,.12), 0 0 14px rgba(0,0,0,.06); }
.tech-title { margin: 0 0 6px; font-weight: 700; letter-spacing: .06em; }
.tech-desc { margin: 0; color: var(--text-muted); }

/* Footer */
.footer { padding: 36px 0 64px; color: var(--text-muted); }