/* Custom CSS Variables */
:root {
  --primary-color: #0066cc;
  --primary-hover: #0052a3;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  --light-bg: #f8f9fa;
  --dark-bg: #343a40;
  --border-radius: 8px;
  --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  --box-shadow-hover: 0 4px 8px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
}

html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem var(--primary-color);
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
  background-color: var(--light-bg);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Enhanced Layout */
.container {
  max-width: 1200px;
}

/* Enhanced Cards */
.card {
  border: none;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  margin-bottom: 1.5rem;
}

.card:hover {
  box-shadow: var(--box-shadow-hover);
  transform: translateY(-2px);
}

.card-header {
  background-color: white;
  border-bottom: 1px solid #e9ecef;
  border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
  padding: 1rem 1.5rem;
}

.card-body {
  padding: 1.5rem;
}

/* Enhanced Buttons */
.btn {
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition);
  padding: 0.5rem 1.2rem;
}

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

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
}

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

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

/* Enhanced Forms */
.form-control, .form-select {
  border-radius: var(--border-radius);
  border: 2px solid #e9ecef;
  transition: var(--transition);
  padding: 0.75rem 1rem;
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-label {
  font-weight: 600;
  color: var(--dark-bg);
  margin-bottom: 0.5rem;
}

/* Enhanced Tables */
.table {
  background-color: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
}

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

.table thead th {
  border: none;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}

.table tbody tr {
  transition: var(--transition);
}

.table tbody tr:hover {
  background-color: rgba(0, 102, 204, 0.05);
}

/* Enhanced Navigation */
.navbar {
  background-color: white !important;
  box-shadow: var(--box-shadow);
  padding: 1rem 0;
}

.navbar-brand {
  font-weight: 700;
  color: var(--primary-color) !important;
  font-size: 1.5rem;
}

.nav-link {
  font-weight: 500;
  color: var(--dark-bg) !important;
  transition: var(--transition);
  padding: 0.5rem 1rem !important;
  border-radius: var(--border-radius);
  margin: 0 0.2rem;
}

.nav-link:hover {
  background-color: var(--light-bg);
  color: var(--primary-color) !important;
}

/* Page Headers */
h1, h2, h3, h4, h5, h6 {
  color: var(--dark-bg);
  font-weight: 600;
}

.page-header {
  background-color: white;
  padding: 2rem 0;
  margin-bottom: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

/* Enhanced Alerts */
.alert {
  border: none;
  border-radius: var(--border-radius);
  font-weight: 500;
}

/* Contact Group Styling */
.group-selection {
  background-color: white;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: 1.5rem;
}

.form-check {
  padding: 0.75rem;
  margin: 0.5rem 0;
  background-color: #f8f9fa;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.form-check:hover {
  background-color: #e9ecef;
}

.form-check-input {
  margin-top: 0.25rem;
}

.form-check-label {
  font-weight: 500;
  color: var(--dark-bg);
}

/* Message Composition */
.compose-section {
  background-color: white;
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: 1.5rem;
}

/* Badges */
.badge {
  font-weight: 500;
  padding: 0.5rem 0.8rem;
  border-radius: 20px;
}

/* Action Buttons */
.btn-group .btn {
  margin-right: 0.5rem;
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .card-body {
    padding: 1rem;
  }
  
  .table-responsive {
    border-radius: var(--border-radius);
  }
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
  color: var(--bs-secondary-color);
  text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
  text-align: start;
}