/* Pevnist — design tokens from 07-visual-assets-playbook + BRAND */
:root {
  --bg-base: #090B10;
  --bg-surface: #0F1219;
  --bg-elevated: #161B26;
  --navy: #0f172a;
  --slate: #1e293b;
  --slate-border: #334155;
  --slate-light: #475569;
  --muted: #64748b;
  --text: #f1f5f9;
  --text-dim: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #60a5fa;
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --gold: #D4A843;
  font-family: system-ui, -apple-system, 'Inter', 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--navy); color: var(--text); line-height: 1.6; overflow-x: hidden; }

/* Nav */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--slate); border-bottom: 1px solid var(--slate-light);
  padding: 0.75rem 1.5rem; display: flex; align-items: center; justify-content: space-between;
}
.site-nav .logo { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text); text-decoration: none; }
.site-nav .links { display: flex; align-items: center; gap: 2rem; }
.site-nav .links a { color: var(--text-dim); text-decoration: none; font-size: 0.9rem; }
.site-nav .links a:hover { color: var(--text); }
.site-nav .btn { display: inline-block; padding: 0.5rem 1rem; border-radius: 8px; font-size: 0.9rem; font-weight: 600; text-decoration: none; transition: background .2s; }
.site-nav .btn-ghost { color: var(--text-dim); }
.site-nav .btn-primary { background: var(--accent); color: #fff; }
.site-nav .btn-primary:hover { background: var(--accent-hover); }

/* Section spacing */
.sec { padding: clamp(3rem, 8vw, 6rem) 1.5rem; max-width: 1200px; margin: 0 auto; }
.sec-narrow { max-width: 900px; }
h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 800; line-height: 1.08; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 700; letter-spacing: -0.015em; margin-bottom: 1rem; }
.label { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.5rem; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.card {
  background: var(--slate); border: 1px solid var(--slate-light); border-radius: 12px;
  padding: 1.5rem; transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .icon { font-size: 2rem; margin-bottom: 0.75rem; }
.card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.card p { font-size: 0.9rem; color: var(--text-dim); line-height: 1.5; }

/* Product / project page sections */
.section-hero { min-height: 60vh; display: flex; align-items: center; justify-content: center; text-align: center; }
.section-hero h1 { margin-bottom: 1rem; }
.section-hero .sub { font-size: clamp(1rem, 2vw, 1.35rem); color: var(--text-dim); max-width: 42ch; margin: 0 auto 2rem; }
.diagram-wrap { margin: 2rem 0; border-radius: 12px; overflow: hidden; }
.diagram-wrap img, .diagram-wrap object { width: 100%; height: auto; display: block; }
@media (max-width: 768px) {
  .site-nav .links { gap: 1rem; }
  .site-nav .links a:not([href*="product"]) { display: none; }
}