:root {
  color-scheme: light dark;
  --bg: #f7f7f8;
  --panel: #fff;
  --text: #1a1a1a;
  --muted: #666;
  --border: #e2e2e5;
  --accent: #2563eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214;
    --panel: #1c1c1f;
    --text: #f0f0f0;
    --muted: #999;
    --border: #2c2c30;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 14px/1.5 system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
header h1 { font-size: 16px; margin: 0; }
nav.tabs {
  display: flex;
  gap: 4px;
  padding: 8px 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
nav.tabs button {
  padding: 6px 12px;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  border-radius: 6px;
  font: inherit;
}
nav.tabs button.active { background: var(--accent); color: #fff; }
main { max-width: 960px; margin: 0 auto; padding: 20px; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 12px;
}
.muted { color: var(--muted); }
button.primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
}
input {
  font: inherit;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
}