@layer reset, base, theme, components, utilities;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body { margin: 0; }
}

@layer base {
  :root {
    color-scheme: light dark;
    --font-sans: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    
    --color-bg: light-dark(#fff, #121212);
    --color-text: light-dark(#222, #e0e0e0);
    --color-text-muted: light-dark(#666, #aaa);
    --color-link: light-dark(#0066cc, #4da3ff);
    --color-link-hover: light-dark(#0055aa, #80bfff);
    --color-border: light-dark(#eee, #333);
    --color-surface: light-dark(#f9f9f9, #1e1e1e);
    --color-accent: light-dark(#0066cc, #4da3ff);
    --color-accent-text: #fff;
    --color-success: light-dark(#1a9a1a, #4ade80);
    --color-error: light-dark(#e02020, #f87171);
    --color-pending: light-dark(#888, #777);
  }

  body {
    font: 16px/1.6 var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    max-width: 42rem;
    margin: clamp(1.5rem, 5vw, 4rem) auto;
    padding: 0 1rem;
    transition: background-color 0.3s, color 0.3s;
  }

  h1, h2, h3 { color: var(--color-text); line-height: 1.2; text-wrap: balance; }
  h1 { font-size: 2.5rem; margin-bottom: 1rem; }
  h2 { font-size: 1.5rem; margin-top: 2.5rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.5rem; }
  
  a { color: var(--color-link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
  a:hover { color: var(--color-link-hover); }

  code {
    background: var(--color-surface);
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  }

  table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5rem 0;
    font-size: 0.9rem;
  }
  th, td {
    border: 1px solid var(--color-border);
    padding: 0.6rem 0.8rem;
    text-align: left;
    vertical-align: top;
  }
  th {
    background: var(--color-surface);
    font-weight: 600;
    text-wrap: balance;
  }
}

@layer components {
  .site-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
  }
  .site-nav .site-name {
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
    font-size: 1.1rem;
    margin-right: auto;
  }
  .site-nav a:not(.site-name) {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
  }
  .site-nav a:not(.site-name):hover {
    color: var(--color-accent);
  }

  .cta {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: var(--color-accent-text);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: transform 0.1s, background-color 0.2s;
  }
  .cta:hover {
    background-color: var(--color-link-hover);
    color: var(--color-accent-text);
    transform: translateY(-1px);
  }
  .cta:active { transform: translateY(0); }

  .muted { color: var(--color-text-muted); font-size: 0.9rem; }

  .table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 1rem 0;
    border: 1px solid var(--color-border);
    border-radius: 8px;
  }

  /* Stats components */
  .stat-section { margin: 2rem 0; }
  .stat-item { margin: 1rem 0; }
  .stat-label { font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: 0.5rem; }
  .stat-row { display: flex; align-items: center; gap: 1rem; }
  .stat-track {
    flex: 1;
    height: 12px;
    background: var(--color-surface);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--color-border);
  }
  .stat-bar {
    height: 100%;
    background: var(--color-accent);
    border-radius: 6px;
    transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  }
  .stat-value { font-size: 0.9rem; font-weight: 500; min-width: 6rem; text-align: right; }

  /* Report table specifics */
  .compact-table { font-size: 0.85rem; }
  .compact-table th, .compact-table td { padding: 0.4rem 0.6rem; }
  .ok-cell   { color: var(--color-success); text-align: center; font-weight: bold; }
  .fail-cell { color: var(--color-error); text-align: center; font-weight: bold; }
  .na-cell   { color: var(--color-text-muted); text-align: center; opacity: 0.6; }
  .num-cell  { text-align: right; font-variant-numeric: tabular-nums; }

  .timing-diagram {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8rem;
    line-height: 1.5;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
    color: var(--color-text);
    margin: 1.5rem 0;
  }

  /* Theme Toggle */
  .theme-toggle-container {
    display: flex;
    align-items: center;
    margin-left: auto;
  }
  .theme-toggle-btn {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 0.3rem 0.6rem;
    font-size: 1.1rem;
    cursor: pointer;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, border-color 0.2s, transform 0.1s;
    outline-color: var(--color-accent);
  }
  .theme-toggle-btn:hover {
    border-color: var(--color-text-muted);
    background: var(--color-border);
  }
  .theme-toggle-btn:active {
    transform: translateY(1px);
  }

  /* Skeleton loaders */
  .skeleton {
    background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
    display: inline-block;
  }
  @keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }
}

@layer utilities {
  .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;
  }
}