:root {
  --bg: #ffffff;
  --bg-alt: #f6f8fa;
  --text: #1f2328;
  --text-dim: #57606a;
  --border: #d0d7de;
  --link: #0969da;
  --grade-a: #1a7f37;
  --grade-b: #1a7f37;
  --grade-c: #9a6700;
  --grade-d: #9a6700;
  --grade-f: #cf222e;
  --code-bg: #f6f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-alt: #161b22;
    --text: #e6edf3;
    --text-dim: #8b949e;
    --border: #30363d;
    --link: #58a6ff;
    --grade-a: #3fb950;
    --grade-b: #3fb950;
    --grade-c: #d29922;
    --grade-d: #d29922;
    --grade-f: #f85149;
    --code-bg: #161b22;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

a { color: var(--link); }

code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-size: 0.9em;
}

.page-header {
  border-bottom: 1px solid var(--border);
  padding: 40px 24px 28px;
  text-align: center;
}

.page-header h1 {
  margin: 0 0 12px;
  font-size: 1.8rem;
}

.tagline {
  max-width: 640px;
  margin: 0 auto;
  color: var(--text-dim);
}

h2 { font-size: 1.15rem; margin-top: 40px; }

.methodology ul { color: var(--text-dim); }
.methodology p { color: var(--text-dim); }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

th.numeric, td.numeric { text-align: right; }

thead th {
  background: var(--bg-alt);
  cursor: pointer;
  user-select: none;
  position: sticky;
  top: 0;
}

thead th:hover { color: var(--link); }

thead th.sorted::after { content: " \25BE"; }
thead th.sorted.asc::after { content: " \25B4"; }

tbody tr:last-child td { border-bottom: none; }

.loading { color: var(--text-dim); text-align: center; }

.grade {
  display: inline-block;
  min-width: 1.6em;
  text-align: center;
  font-weight: 700;
  border-radius: 4px;
  padding: 1px 6px;
}

.grade-A, .grade-B { color: var(--grade-a); }
.grade-C, .grade-D { color: var(--grade-c); }
.grade-F { color: var(--grade-f); }

.repo-link { font-weight: 600; }

.badge-snippet {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  overflow-x: auto;
  font-size: 0.85rem;
}

.page-footer {
  text-align: center;
  color: var(--text-dim);
  padding: 24px;
  font-size: 0.85rem;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}