:root {
  --bg: #020406;
  --bg-panel: rgba(10, 15, 20, 0.8);
  --accent: #69d2ff;
  --accent-dim: rgba(105, 210, 255, 0.12);
  --border: rgba(105, 210, 255, 0.15);
  --border-bright: rgba(105, 210, 255, 0.4);
  --text-main: #e0e6ed;
  --text-muted: #64748b;
  --font-mono: "IBM Plex Mono", monospace;
  --font-sans: "Inter", sans-serif;
  --nav-h: 72px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.4;
  letter-spacing: -0.02em;
  overflow-x: hidden;
}

/* Background HUD Grid */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1;
  background-image: 
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black, transparent 90%);
}

/* Hard-Edge Modules */
.module {
  border: 1px solid var(--border);
  background: var(--bg-panel);
  padding: 2.5rem;
  position: relative;
  transition: border-color 0.3s ease;
}

.module::after {
  content: ""; position: absolute; top: -1px; left: -1px; width: 10px; height: 10px;
  border-top: 2px solid var(--accent); border-left: 2px solid var(--accent);
}

.mono { font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.25em; font-size: 0.75rem; }

/* Navigation */
nav {
  height: var(--nav-h); display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px; position: fixed; top: 0; width: 100%; z-index: 1000;
  background: rgba(2, 4, 6, 0.9); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border);
}
.nav-logo { color: #fff; text-decoration: none; display: flex; align-items: center; gap: 12px; }
.nav-dot { width: 8px; height: 8px; background: var(--accent); border-radius: 50%; box-shadow: 0 0 12px var(--accent); animation: pulse 3s infinite; }
.nav-links { display: flex; gap: 40px; list-style: none; }
.nav-links a { color: var(--text-muted); text-decoration: none; font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.2em; transition: 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* Layout Section */
section { padding: 160px 48px 80px; max-width: 1400px; margin: 0 auto; }
h1 { font-size: clamp(3rem, 10vw, 8rem); font-weight: 800; line-height: 0.9; letter-spacing: -0.05em; margin: 2rem 0; }
h2 { font-size: clamp(2rem, 5vw, 4rem); font-weight: 700; line-height: 1.1; margin-bottom: 2rem; }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
@media (max-width: 1024px) { .grid-stack { grid-template-columns: 1fr !important; } }