:root {
  --brand-red: #c1121f;
  --brand-red-dark: #8f0f19;
  --brand-white: #ffffff;
  --brand-gray: #f6f7fb;
  --text-dark: #1f2937;
  --text-muted: #6b7280;
}

body {
  font-family: "Montserrat", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #fff, var(--brand-gray) 45%);
  color: var(--text-dark);
}

.brand-nav {
  background: linear-gradient(90deg, var(--brand-red), var(--brand-red-dark));
  box-shadow: 0 6px 20px rgba(193, 18, 31, 0.2);
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: 0.3px;
}

.card {
  border: none;
  border-radius: 16px;
}

.card.shadow-sm {
  box-shadow: 0 16px 40px rgba(31, 41, 55, 0.08);
}

.btn-primary {
  background: var(--brand-red);
  border-color: var(--brand-red);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--brand-red-dark);
  border-color: var(--brand-red-dark);
}

.btn-outline-primary {
  color: var(--brand-red);
  border-color: var(--brand-red);
}

.btn-outline-primary:hover {
  background: var(--brand-red);
  border-color: var(--brand-red);
}

.stat-box {
  background: #fff5f5;
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  border: 1px solid rgba(193, 18, 31, 0.15);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--brand-red-dark);
}

.table td, .table th {
  vertical-align: middle;
}

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease-in-out;
  z-index: 1055;
}

.loading-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.loading-card {
  background: #ffffff;
  padding: 28px 32px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.2);
}

.spinner-ring {
  width: 48px;
  height: 48px;
  border: 4px solid #f2c7cb;
  border-top: 4px solid var(--brand-red);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 768px) {
  .navbar-brand {
    font-size: 1rem;
  }

  .card-body {
    padding: 1.25rem;
  }

  .stat-value {
    font-size: 1.3rem;
  }

  .table {
    font-size: 0.85rem;
  }
}