@layer reset, base, components, effects;

/* ===== reset ===== */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    margin: 0;
    min-height: 100vh;
    text-rendering: optimizeLegibility;
  }
}

/* ===== base ===== */
@layer base {
  body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.6;
    background-color: var(--bg);
    color: var(--fg);
  }

  .container {
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: 1.25rem;
  }

  h1,
  h2,
  h3,
  h4 {
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--fg);
    margin-top: 0;
  }

  h1 {
    font-size: 1.8rem;
    line-height: 1.2;
  }

  h2 {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
  }

  h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
  }

  p {
    margin-top: 0.25rem;
    margin-bottom: 0.75rem;
    color: var(--fg-muted);
  }

  ul,
  ol {
    padding-left: 1.1rem;
    margin-top: 0.25rem;
    margin-bottom: 0.75rem;
  }

  a {
    color: var(--accent-strong);
    text-decoration: none;
  }

  a:hover,
  a:focus-visible {
    text-decoration: underline;
  }

  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }

  .skip-link {
    position: absolute;
    left: 0.75rem;
    top: 0.5rem;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    background-color: var(--accent);
    color: #ffffff;
    font-size: 0.85rem;
    transform: translateY(-200%);
    transition: transform var(--motion-fast);
    z-index: 999;
  }

  .skip-link:focus-visible {
    transform: translateY(0);
  }

  .visually-hidden {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    width: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    position: absolute;
  }

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