/* Color Variables */
:root {
  --color-primary: #6366F1;
  --color-primary-hover: #4F46E5;
  --color-primary-active: #4338CA;
  --color-secondary: #8B5CF6;
  --color-success: #10B981;
  --color-danger: #EF4444;
  --color-warning: #F59E0B;
  --color-info: #3B82F6;
  --color-bg-light: #F9FAFB;
  --color-bg-card: #FFFFFF;
  --color-bg-dark: #1F2937;
  --color-text-primary: #111827;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-text-on-dark: #FFFFFF;
  --color-border: #E5E7EB;
  --color-border-medium: #D1D5DB;
}

/* Typography */
body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-light);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  color: white;
  padding: 5rem 1rem;
  margin-bottom: 3rem;
}

.hero-section h1 {
  font-size: 3.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

/* Cards */
.card {
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  transition: all 0.2s ease;
}

.card:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

/* Forms */
.form-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 1rem;
}

.form-label {
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Buttons */
.btn {
  border-radius: 0.5rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

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

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

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

/* Navbar */
.navbar-brand {
  font-weight: 700;
  font-size: 1.25rem;
}

.navbar-nav .nav-link {
  transition: color 0.2s ease;
}

/* Tables */
.table thead th {
  background-color: #F3F4F6;
  border-bottom: 2px solid var(--color-border);
  font-weight: 600;
  color: var(--color-text-primary);
}

.table td {
  vertical-align: middle;
}

/* Alert/Flash Messages */
.alert {
  border-radius: 0.5rem;
  border-left: 4px solid;
  border-top: none;
  border-right: none;
  border-bottom: none;
}

.alert-success {
  background-color: #D1FAE5;
  border-left-color: var(--color-success);
  color: #065F46;
}

.alert-danger {
  background-color: #FEE2E2;
  border-left-color: var(--color-danger);
  color: #7F1D1D;
}

.alert-error {
  background-color: #FEE2E2;
  border-left-color: #EF4444;
  color: #7F1D1D;
}

.alert-info {
  background-color: #DBEAFE;
  border-left-color: var(--color-info);
  color: #1E40AF;
}

/* List Group */
.list-group-item {
  border-color: var(--color-border);
}

.list-group-item:hover {
  background-color: var(--color-bg-light);
}

/* Form Check (Radio/Checkbox) */
.form-check-input:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-check-label {
  cursor: pointer;
  user-select: none;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-section h1 {
    font-size: 2.5rem;
  }
  
  .table {
    font-size: 0.8rem;
  }
}