/* ============================================
   CORE STYLES - Variables, Reset, Base Layout
   ============================================ */

/* CSS VARIABLES - Design Tokens */
:root {
  /* Pure Black Palette */
  --color-bg-primary: #000000;
  --color-bg-secondary: #0a0a0a;
  --color-bg-panel: rgba(10, 10, 10, 0.95);
  --color-bg-input: #0f0f0f;

  /* Accent Colors - Cyan/Blue Technical */
  --color-primary: #00d4ff;
  --color-primary-dim: #0088aa;
  --color-border: #1a1a1a;
  --color-border-bright: #2a2a2a;

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a0a0a0;
  --color-text-dim: #606060;

  /* CTS Threat Level Colors */
  --color-nominal: #00ff88;
  --color-elevated: #ffcc00;
  --color-warning: #ff8800;
  --color-critical: #ff0055;

  /* Spacing System (8px grid) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;

  /* Typography */
  --font-mono: "SF Mono", "Monaco", "Inconsolata", "Roboto Mono", "Consolas",
    monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI",
    sans-serif;

  /* Effects */
  --blur-glass: blur(20px);
  --shadow-panel: 0 8px 32px rgba(0, 212, 255, 0.1);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
}

/* GLOBAL RESET & BASE STYLES */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-mono);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  overflow-x: hidden;
  overflow-y: auto;
  letter-spacing: 0.03em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  width: 100vw;
  /* Add smooth scrolling */
  scroll-behavior: smooth;
}

/* Page loader */
body.loading {
  overflow: hidden;
}

/* Initial page load animation */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

body {
  animation: fadeIn 0.5s ease-in;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

/* CANVAS (Background Layer) */
#scene-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  background: var(--color-bg-primary);
}

/* OVERLAY CONTAINER */
#overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 100vh;
  z-index: 10;
  pointer-events: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding: 0;
  padding-top: 0; /* No padding for Stage 1 */
  padding-bottom: var(--space-xxl);
  overflow-y: visible;
  overflow-x: hidden;
}

/* Custom Scrollbar for Overlay */
#overlay::-webkit-scrollbar {
  width: 8px;
}
#overlay::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.3);
}
#overlay::-webkit-scrollbar-thumb {
  background: linear-gradient(
    180deg,
    rgba(0, 212, 255, 0.3),
    rgba(0, 100, 150, 0.5)
  );
  border-radius: 4px;
}
#overlay::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(
    180deg,
    rgba(0, 212, 255, 0.5),
    rgba(0, 100, 150, 0.7)
  );
}

#overlay > * {
  pointer-events: auto;
}

/* Responsive */
@media (max-width: 1024px) {
  #overlay {
    padding: 0;
    padding-top: 72px;
  }
}
