:root {
  --bg: #f6f7f9;
  --fg: #1d2330;
  --muted: #5b6475;
  --accent: #2563eb;
  --card: #ffffff;
  --border: #dde1e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --fg: #e7eaf0;
    --muted: #9aa3b2;
    --accent: #60a5fa;
    --card: #1b2029;
    --border: #2b3240;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
}
header {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
header h1 { margin: 0; font-size: 1.25rem; }
#user { display: flex; gap: 8px; align-items: center; color: var(--muted); }
main { max-width: 720px; margin: 32px auto; padding: 0 16px; }
section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
button {
  font: inherit;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.badge {
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 0.8rem;
}
.error { color: #dc2626; }
[hidden] { display: none !important; }