:root {
  --admin-bg: #f4f6fb;
  --admin-card: #ffffff;
  --admin-text: #0f172a;
  --admin-muted: #64748b;
  --admin-primary: #0f4c81;
  --admin-accent: #ff7a00;
  --admin-border: #e2e8f0;
  --admin-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

body {
  background: var(--admin-bg);
  color: var(--admin-text);
}

.admin-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.admin-sidebar {
  background: #0b1f36;
  color: #e2e8f0;
  padding: 24px 18px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.admin-brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: #fff;
}

.admin-nav {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.admin-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #cbd5f5;
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 12px;
  transition: all 0.2s ease;
}

.admin-nav a.active,
.admin-nav a:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.admin-content {
  padding: 24px 28px 40px;
}

.admin-topbar {
  background: var(--admin-card);
  border-radius: 18px;
  padding: 14px 18px;
  box-shadow: var(--admin-shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}

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

.admin-page {
  margin-top: 18px;
}

.admin-card h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.admin-kpi {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.admin-kpi .value {
  font-size: 22px;
  font-weight: 700;
}

.admin-badge {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(15, 76, 129, 0.12);
  color: var(--admin-primary);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.admin-table th,
.admin-table td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--admin-border);
}

.admin-table th {
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--admin-muted);
}

.admin-btn {
  background: var(--admin-primary);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.admin-btn.secondary {
  background: #0b1f36;
}

.admin-muted {
  color: var(--admin-muted);
}

.admin-alert {
  padding: 12px 16px;
  border-radius: 12px;
  margin-bottom: 16px;
  border: 1px solid var(--admin-border);
  background: #fff;
}

.admin-alert.success {
  border-color: #86efac;
  background: #f0fdf4;
  color: #166534;
}

.admin-alert.error {
  border-color: #fecaca;
  background: #fef2f2;
  color: #991b1b;
}

.admin-form input,
.admin-form select,
.admin-form textarea {
  border-radius: 12px;
  border: 1px solid var(--admin-border);
  padding: 10px 12px;
  width: 100%;
}

.admin-form label {
  font-weight: 600;
  margin-bottom: 6px;
}

.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(40px, 1fr));
  gap: 6px;
  font-size: 12px;
}

.heatmap-cell {
  border-radius: 8px;
  padding: 10px 6px;
  text-align: center;
  color: #fff;
  font-weight: 600;
}

@media (max-width: 1100px) {
  .admin-shell {
    grid-template-columns: 1fr;
  }

  .admin-sidebar {
    position: relative;
    height: auto;
  }
}

@media (max-width: 768px) {
  .admin-content {
    padding: 18px;
  }
}