/**
 * Base CSS - Core typography, defaults, accessible focus states
 */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Accessible Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--primary-color);
  color: #ffffff;
  padding: 0.5rem 1rem;
  z-index: 9999;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

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

/* Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-color);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p {
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Selection */
::selection {
  background-color: var(--primary-light);
  color: var(--primary-color);
}

/* 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;
  }
}