:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px;
  background: #111827;
  color: #d1d5db;
  padding: 20px 0;
  flex-shrink: 0;
}
.sidebar .brand {
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  padding: 0 20px 20px;
  border-bottom: 1px solid #1f2937;
  margin-bottom: 10px;
}
.sidebar a {
  display: block;
  padding: 10px 20px;
  color: #d1d5db;
  text-decoration: none;
  font-size: 14px;
}
.sidebar a:hover, .sidebar a.active { background: #1f2937; color: #fff; }
.main { flex: 1; padding: 28px 32px; }
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 24px;
}
.topbar h1 { font-size: 20px; margin: 0; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.stat-value { font-size: 26px; font-weight: 700; }
.stat-label { color: var(--muted); font-size: 13px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }
.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
}
.badge-success { background: #dcfce7; color: var(--success); }
.badge-danger { background: #fee2e2; color: var(--danger); }
.badge-warning { background: #fef3c7; color: var(--warning); }
.badge-muted { background: #e5e7eb; color: var(--muted); }
.btn {
  display: inline-block; padding: 8px 16px; border-radius: 8px; font-size: 14px;
  text-decoration: none; border: none; cursor: pointer; font-weight: 600;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: #fff; border: 1px solid var(--border); color: var(--text); }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px;
}
.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
}
.login-card { width: 360px; }
.alert { padding: 10px 14px; border-radius: 8px; font-size: 14px; margin-bottom: 16px; }
.alert-error { background: #fee2e2; color: var(--danger); }
.alert-success { background: #dcfce7; color: var(--success); }