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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

img,
picture,
video,
svg {
  display: block;
  max-width: 100%;
}

/* === Typography === */
body {
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background-color: #fff;
}

h1,
h2,
h3,
h4 {
  line-height: 1.2;
  margin-bottom: 0.5em;
}

p {
  margin-bottom: 1em;
}

a {
  color: #0056b3;
}

a:hover {
  text-decoration: none;
}

/* === Skip Link === */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: #0056b3;
  color: #fff;
  text-decoration: none;
  border-radius: 0 0 0.25rem 0.25rem;
}

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

/* === Layout === */
header {
  padding: 1rem;
  border-bottom: 1px solid #e0e0e0;
}

header nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: 60rem;
  margin: 0 auto;
}

header nav ul {
  display: flex;
  list-style: none;
  gap: 1rem;
}

.site-title {
  font-weight: 700;
  text-decoration: none;
  color: inherit;
}

main {
  max-width: 60rem;
  margin: 0 auto;
  padding: 2rem 1rem;
}

footer {
  padding: 1rem;
  border-top: 1px solid #e0e0e0;
  text-align: center;
  font-size: 0.875rem;
  color: #666;
}

/* === Focus Styles === */
:focus-visible {
  outline: 3px solid #0056b3;
  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;
    scroll-behavior: auto !important;
  }
}