/* ============================================================
   variants/05-pixel-tech-4/css/base.css
   Reset, box-sizing, root variables, skip-link, focus styles,
   prefers-reduced-motion, matrix rain effects
   Matrix Rain: green digital rain, falling code, hacker style
   ============================================================ */

/* CSS Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

/* Body */
body {
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.2;
  font-weight: 700;
}

p {
  margin-bottom: 1rem;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Matrix rain effect background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse at center, rgb(57, 255, 20, 0.02) 0%, transparent 70%),
    linear-gradient(180deg, #000 0%, #1a1a1a 50%, #000 100%);
}

/* ─── CSS Custom Properties (Brand Tokens) ─── */
:root {
  /* Primary colors - Matrix Rain palette */
  --color-neon-green: #39ff14;
  --color-black: #000;
  --color-silver: #c0c0c0;

  /* Secondary colors */
  --color-dark-gray: #1a1a1a;
  --color-matrix-green: #0f6;

  /* Accent - electric purple for matrix glow */
  --color-electric-purple: #9b30ff;

  /* Semantic colors */
  --color-bg-primary: var(--color-black);
  --color-bg-secondary: var(--color-dark-gray);
  --color-text-primary: var(--color-silver);
  --color-text-secondary: var(--color-neon-green);
  --color-accent-primary: var(--color-electric-purple);
  --color-border: var(--color-dark-gray);
  --color-highlight: var(--color-matrix-green);

  /* Aliases for backward compatibility */
  --color-primary: var(--color-bg-primary);
  --color-secondary: var(--color-bg-secondary);
  --color-text: var(--color-text-primary);
  --color-muted: var(--color-silver);

  /* Typography - Font families (self-hosted) */
  --font-headline: 'Orbitron', monospace;
  --font-body: 'Inter', sans-serif;
  --font-ui: 'Roboto Mono', monospace;
  --font-code: 'JetBrains Mono', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Touch target minimum */
  --touch-target: 44px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* ─── Skip Link ─── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-neon-green);
  color: var(--color-black);
  font-family: var(--font-ui);
  font-weight: 700;
  padding: var(--space-sm) var(--space-md);
  z-index: 10000;
  text-decoration: none;
  border: 2px solid var(--color-neon-green);
}

.skip-link:focus {
  top: var(--space-sm);
  outline: 2px solid var(--color-electric-purple);
  outline-offset: 2px;
}

/* ─── Focus Styles ─── */
:focus-visible {
  outline: 2px solid var(--color-neon-green);
  outline-offset: 2px;
  background: transparent;
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ─── Selection ─── */
::selection {
  background: var(--color-neon-green);
  color: var(--color-black);
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-dark-gray);
}

::-webkit-scrollbar-thumb {
  background: var(--color-matrix-green);
  border: 1px solid var(--color-neon-green);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-neon-green);
}