:root {
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --border: #334155;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--text); text-decoration: none; }
.app-shell { display: flex; min-height: 100vh; }
.sidebar { width: 240px; background: var(--panel); padding: 24px; border-right: 1px solid var(--border); }
.brand { font-size: 1.4rem; font-weight: 700; margin-bottom: 24px; }
.sidebar nav { display: grid; gap: 12px; margin-bottom: 24px; }
.content { flex: 1; padding: 24px; }
.page-header { margin-bottom: 24px; }
.card-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 24px; }
.card-grid.two-up { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card, .auth-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.auth-page { display: grid; place-items: center; min-height: 100vh; padding: 24px; }
.auth-card { width: min(420px, 100%); }
.muted { color: var(--muted); }
.stack { display: grid; gap: 12px; }
input { width: 100%; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); }
.button { display: inline-block; padding: 10px 14px; border-radius: 8px; border: 0; background: var(--accent); color: #082f49; font-weight: 700; cursor: pointer; }
.button.secondary { margin-top: 12px; width: 100%; background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
.alert { background: #7f1d1d; color: #fecaca; border-radius: 8px; padding: 10px 12px; margin-bottom: 12px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px; border-bottom: 1px solid var(--border); }
.simple-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.user-card { margin-top: auto; padding-top: 16px; border-top: 1px solid var(--border); }
@media (max-width: 900px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; }
  .card-grid, .card-grid.two-up { grid-template-columns: 1fr; }
}