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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Code */
code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

code {
  background-color: var(--color-bg-secondary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

pre {
  background-color: var(--color-bg-secondary);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
  border: 1px solid var(--color-border);
}

pre code {
  background-color: transparent;
  padding: 0;
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

li {
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

/* 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;
}

.hidden {
  display: none !important;
}

.container {
  width: 100%;
  padding: 0 var(--space-md);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 960px;
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1140px;
  }
}

/* Focus Management */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  z-index: 100;
}

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