/* === BASE STYLES === */
/* Core resets, typography, and layout primitives */

:root {
  /* Light mode colors - WCAG AA compliant */
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f4;
  --text-primary: #1c1917;
  --text-secondary: #44403c;  /* 7.5:1 contrast on white */
  --text-tertiary: #78716c;   /* 4.5:1 contrast on white - AA compliant */
  --border-color: #d6d3d1;

  /* Typography - Merriweather + Aktiv Grotesk + IBM Plex Mono */
  --font-serif: 'Merriweather', Georgia, serif;
  --font-sans: 'aktiv-grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

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

  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 300ms ease-out;
  --transition-slow: 500ms ease-out;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-tertiary: #999999;
    --border-color: #444444;
  }
}


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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  font-family: var(--font-sans);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  font-family: var(--font-sans);
  letter-spacing: -0.01em;
  margin-top: var(--spacing-xl);
}

h3 {
  font-size: 1.5rem;
  font-family: var(--font-sans);
}

h4 {
  font-size: 1.25rem;
  font-family: var(--font-sans);
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

p {
  margin-bottom: var(--spacing-md);
}

p + p {
  margin-top: var(--spacing-md);
}

small {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* === LINKS === */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

a:active {
  opacity: 0.7;
}

/* === LISTS === */
ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

li {
  margin-bottom: var(--spacing-sm);
}

/* === CODE === */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--bg-secondary);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  color: var(--text-primary);
}

pre {
  background-color: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
  font-size: 0.9rem;
  line-height: 1.4;
}

pre code {
  background: none;
  padding: 0;
}

/* === BLOCKQUOTES === */
blockquote {
  border-left: 4px solid var(--accent);
  padding-left: var(--spacing-lg);
  margin-left: 0;
  margin-bottom: var(--spacing-lg);
  color: var(--text-secondary);
  font-style: italic;
}

/* === IMAGES === */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* === BUTTONS === */
button, [type="button"], [type="submit"], [type="reset"] {
  font-family: inherit;
  font-size: inherit;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: 4px;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

button:hover, [type="button"]:hover, [type="submit"]:hover {
  border-color: var(--text-tertiary);
  background-color: var(--bg-secondary);
}

/* Primary button variant */
.btn-primary {
  background-color: var(--text-primary);
  border-color: var(--text-primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background-color: var(--text-secondary);
  border-color: var(--text-secondary);
}

/* === CTA LINKS & BUTTONS === */
/* Unified styles for page CTAs - use .cta-link for all */
.cta-link,
.cta-btn,
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
  border: 2px solid var(--text-primary);
  padding: 12px 24px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.cta-link:hover,
.cta-btn:hover,
.cta-button:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  text-decoration: none;
}

.cta-link span,
.cta-btn span,
.cta-button span {
  transition: transform 0.3s ease;
}

.cta-link:hover span,
.cta-btn:hover span,
.cta-button:hover span {
  transform: translateX(4px);
}

/* === LAYOUT === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-sm {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color, var(--accent));
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  body {
    font-size: 15px;
  }
}