/* ============================================================
   CLUSTER FABRIK — main.css
   CSS custom properties, reset, typography, layout utilities
   ============================================================ */

/* --- Custom Properties --- */
:root {
  --color-primary:    #2563eb;
  --color-primary-dim:#1d4ed8;
  --color-accent:     #f97316;
  --color-accent-dim: #ea6c0a;
  --color-bg:         #0a0f1e;
  --color-surface:    #0f1a2e;
  --color-surface-2:  #162032;
  --color-border:     #1e293b;
  --color-text:       #f8fafc;
  --color-muted:      #64748b;
  --color-muted-2:    #94a3b8;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --radius-sm:  6px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;

  --shadow-glow: 0 0 32px rgba(37, 99, 235, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);

  --max-width: 1200px;
  --section-padding: 96px 24px;
}

/* --- Font Face --- */
@font-face {
  font-family: 'Inter';
  src: url('/fonts/inter/inter-400.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('/fonts/inter/inter-500.woff2') format('woff2');
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('/fonts/inter/inter-600.woff2') format('woff2');
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('/fonts/inter/inter-700.woff2') format('woff2');
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('/fonts/inter/inter-800.woff2') format('woff2');
  font-weight: 800; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/fonts/jetbrains-mono/jetbrains-mono-400.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/fonts/jetbrains-mono/jetbrains-mono-500.woff2') format('woff2');
  font-weight: 500; font-style: normal; font-display: swap;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* --- Typography --- */
h1 { font-size: clamp(36px, 5vw, 56px); font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
h3 { font-size: clamp(18px, 2.5vw, 24px); font-weight: 600; line-height: 1.3; }
h4 { font-size: 16px; font-weight: 600; }
p  { font-size: 16px; line-height: 1.7; color: var(--color-muted-2); }
.mono { font-family: var(--font-mono); }

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: var(--section-padding); }
.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.section-title { color: var(--color-text); margin-bottom: 16px; }
.section-sub   { color: var(--color-muted-2); max-width: 600px; margin: 0 auto 48px; text-align: center; }

/* --- Grid Utilities --- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-6 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-6 { grid-template-columns: 1fr; }
}

/* --- Visibility Utility --- */
.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* --- Animation base (GSAP targets) --- */
.reveal { opacity: 0; transform: translateY(32px); }
.reveal-left  { opacity: 0; transform: translateX(-32px); }
.reveal-right { opacity: 0; transform: translateX(32px); }