:root {
  --primary: #6c3ef4;
  --primary-dark: #5126d9;
  --navy: #11285a;
  --bg: #f6f8fc;
  --card: #ffffff;
  --border: #e7ebf3;
  --green: #19c894;
  --red: #f05252;
  --muted: #6b7385;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: var(--bg);
  color: var(--navy);
}

a { color: inherit; text-decoration: none; }

.layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--navy);
  color: white;
  padding: 24px 16px;
}

.brand {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 32px;
}

.brand span { color: #a78bfa; }

.nav a {
  display: block;
  padding: 13px 14px;
  border-radius: 12px;
  margin-bottom: 8px;
  color: #dbe4ff;
}

.nav a:hover, .nav a.active {
  background: var(--primary);
  color: white;
}

.main { padding: 28px; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.grid {
  display: grid;
  gap: 18px;
}

.stats {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
}

.stat-number {
  font-size: 30px;
  font-weight: 900;
  margin-top: 8px;
}

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 13px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th { color: var(--muted); font-size: 13px; }

.btn {
  display: inline-block;
  border: 0;
  border-radius: 11px;
  padding: 11px 16px;
  background: var(--primary);
  color: white;
  cursor: pointer;
  font-weight: 700;
}

.btn:hover { background: var(--primary-dark); }

.btn-danger { background: var(--red); }

input, select, textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 11px;
  margin-top: 6px;
  margin-bottom: 14px;
}

label {
  font-size: 13px;
  color: var(--muted);
  font-weight: 700;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
  background: linear-gradient(135deg, var(--navy), var(--primary));
}

.login-card {
  width: min(430px, 100%);
  background: white;
  border-radius: 22px;
  padding: 30px;
}

.alert {
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 15px;
}

.alert-error { background: #fee2e2; color: #991b1b; }
.alert-success { background: #dcfce7; color: #166534; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .main { padding: 16px; }
  .stats { grid-template-columns: 1fr; }
}