:root {
  --primary-color: #28a745;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --info-color: #17a2b8;
  --warning-color: #ffc107;
  --light-gray: #f8f9fa;
  --border-color: #dee2e6;
  --text-primary: #212529;
  --text-muted: #6c757d;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans",
    "Droid Sans", "Helvetica Neue", sans-serif;
  background-color: var(--light-gray);
}

body {
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

/* Header Styling */
header.navbar {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

header.navbar-brand {
  letter-spacing: 0.5px;
}

/* Form Styling */
.form-label {
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.form-control {
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

.form-control::placeholder {
  color: var(--text-muted);
}

/* Card Styling */
.card {
  border-radius: 0.75rem;
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1) !important;
}

/* Button Styling */
.btn {
  font-weight: 600;
  border-radius: 0.375rem;
  transition: all 0.3s;
}

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

.btn-success:hover {
  background-color: #218838;
  border-color: #218838;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(40, 167, 69, 0.3);
}

.btn-primary {
  background-color: #007bff;
  border-color: #007bff;
}

.btn-primary:hover {
  background-color: #0056b3;
  transform: translateY(-2px);
}

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

.btn-danger:hover {
  background-color: #c82333;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.875rem;
}

/* Alert Styling */
.alert {
  border-radius: 0.375rem;
  border: none;
  margin-bottom: 1.5rem;
}

.alert-success {
  background-color: #d4edda;
  color: #155724;
}

.alert-danger {
  background-color: #f8d7da;
  color: #721c24;
}

/* Invalid Feedback */
.invalid-feedback {
  display: block;
  color: var(--danger-color);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Table Styling */
.table {
  background-color: white;
  margin-bottom: 0;
}

.table thead {
  background-color: var(--primary-color);
  color: white;
}

.table thead th {
  border: none;
  font-weight: 600;
  padding: 1rem;
}

.table tbody td {
  padding: 1rem;
  vertical-align: middle;
  border-color: var(--border-color);
}

.table-hover tbody tr:hover {
  background-color: var(--light-gray);
}

/* Badge Styling */
.badge {
  padding: 0.5rem 0.75rem;
  font-weight: 600;
  border-radius: 0.25rem;
}

.bg-orange {
  background-color: var(--warning-color) !important;
}

/* Stats Cards */
.card.bg-primary .card-body,
.card.bg-success .card-body,
.card.bg-info .card-body,
.card.bg-warning .card-body {
  padding: 1.5rem;
}

.card.bg-primary h4,
.card.bg-success h4,
.card.bg-info h4,
.card.bg-warning h4 {
  font-size: 2rem;
  font-weight: 700;
}

.card.bg-primary h6,
.card.bg-success h6,
.card.bg-info h6,
.card.bg-warning h6 {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
  main.container {
    padding-top: 1.5rem !important;
    padding-bottom: 1.5rem !important;
  }

  .card {
    margin-bottom: 1rem;
  }

  .table {
    font-size: 0.875rem;
  }

  .table thead th,
  .table tbody td {
    padding: 0.75rem;
  }

  .btn-lg {
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
  }

  .d-flex.gap-3 {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .navbar-brand {
    font-size: 1.2rem;
  }

  main.container {
    padding-top: 1rem !important;
  }

  .row > div {
    margin-bottom: 1rem;
  }

  .table-responsive {
    font-size: 0.75rem;
  }

  .btn-sm {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }
}