/**
 * Global Styles - Shared across all pages
 * Import this FIRST in every HTML file
 */

/* ================================
   CSS Custom Properties (Tokens)
   ================================ */
:root {
  /* Dark Mode Color System */
  --color-bg-base: #1a1a1a;
  --color-bg-elevated: #242424;
  --color-text-primary: #e8e8e8;
  --color-text-secondary: #a0a0a0;
  --color-border-subtle: #2f2f2f;

  /* Legacy color names (for compatibility) */
  --color-black: #e8e8e8;  /* Now maps to light text */
  --color-white: #1a1a1a;  /* Now maps to dark bg */
  --color-gray-100: #242424;
  --color-gray-200: #2f2f2f;
  --color-gray-300: #3a3a3a;
  --color-gray-400: #666666;
  --color-gray-500: #a0a0a0;
  --color-gray-600: #b0b0b0;
  --color-gray-700: #c0c0c0;
  --color-gray-800: #d0d0d0;
  --color-gray-900: #e8e8e8;

  /* Colors - Brand */
  --color-accent: #9b8bb8;
  --color-accent-hover: #b5a5cf;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-family-mono: 'SF Mono', 'Consolas', 'Monaco', monospace;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.1rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

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

  /* Layout */
  --max-width-content: 800px;
  --max-width-wide: 1200px;

  /* Borders */
  --border-radius-sm: 4px;
  --border-radius-md: 6px;
  --border-radius-lg: 8px;
  --border-radius-xl: 12px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-base);
}

/* ================================
   Site Header
   ================================ */
.site-header {
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--spacing-md) var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.site-header nav {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: flex;
  gap: var(--spacing-lg);
}

.back-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-base);
}

.back-link:hover {
  color: var(--color-accent);
}

/* ================================
   Site Footer
   ================================ */
.site-footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--spacing-xl);
  text-align: center;
  margin-top: var(--spacing-3xl);
}

.site-footer p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin: 0;
}

.site-footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* ================================
   Utility Classes
   ================================ */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.container-wide {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}