/* NeiroRazdet — design tokens */
:root {
  --c-primary: #6366f1;
  --c-primary-soft: #818cf8;
  --c-primary-pale: #a5b4fc;
  --c-primary-deep: #4f46e5;
  --c-glow: rgba(99,102,241,0.32);

  --c-void: #05050f;
  --c-panel: #0a0a1a;
  --c-panel-raised: #111228;
  --c-line: #1a1c38;
  --c-line-strong: #262a4d;

  --c-text: #f1f1fb;
  --c-text-soft: #cfd1ec;
  --c-text-dim: #9497bf;
  --c-text-faint: #63658c;

  --grd-brand: linear-gradient(135deg, #4f46e5 0%, #818cf8 100%);
  --grd-surface: linear-gradient(160deg, #111228 0%, #0a0a1a 100%);
  --grd-scene: radial-gradient(circle at 15% -5%, rgba(99,102,241,0.16) 0%, transparent 42%), radial-gradient(circle at 90% 105%, rgba(129,140,248,0.10) 0%, transparent 45%), var(--c-void);

  --rad-s: 8px;
  --rad-m: 14px;
  --rad-l: 20px;
  --dur: 0.18s;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--grd-scene);
  color: var(--c-text-soft);
  font-family: 'Inter', Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }

.bound { max-width: 1140px; margin-inline: auto; padding-inline: 24px; }

.block { padding-block: 64px; }
.block--snug { padding-block: 40px; }
.block--tint { background: var(--c-panel); border-block: 1px solid var(--c-line); }

.tag { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--c-primary-soft); margin-bottom: 14px; }
.heading-xl { font-size: clamp(32px, 5vw, 48px); font-weight: 800; line-height: 1.15; color: var(--c-text); }
.heading-lg { font-size: clamp(24px, 3.4vw, 32px); font-weight: 800; line-height: 1.2; color: var(--c-text); }
.lead-text { font-size: 17px; color: var(--c-text-dim); }
.glow-text { background: var(--grd-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }

.action {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: var(--rad-m); font-weight: 700; font-size: 15px;
  transition: transform var(--dur) ease, box-shadow var(--dur) ease;
}
.action--big { padding: 16px 32px; font-size: 16px; }
.action--solid { background: var(--grd-brand); color: #fff; box-shadow: 0 8px 30px var(--c-glow); }
.action--solid:hover { transform: translateY(-2px); box-shadow: 0 12px 36px var(--c-glow); }
.action--outline { background: var(--c-panel-raised); color: var(--c-text); border: 1px solid var(--c-line-strong); }
.action--outline:hover { border-color: var(--c-primary); }
.action--full { width: 100%; }

.grid-split { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-triple { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-quad { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 900px) { .grid-split, .grid-triple, .grid-quad { grid-template-columns: 1fr; } }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }