/* ===== GLOBAL VARIABLES ===== */
:root {
  --primary-color: #3498db;
  --secondary-color: #2c3e50;
  --accent-color: #e74c3c;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --info-color: #17a2b8;
  --light-color: #ecf0f1;
  --dark-color: #2c3e50;
  --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  --border-radius: 10px;
  --transition: all 0.3s ease;
}

/* ===== RESET & BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== NAVBAR ===== */
.navbar {
  background: rgba(44, 62, 80, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--box-shadow);
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: white !important;
  text-decoration: none;
}

.navbar-nav .nav-link {
  color: rgba(255, 255, 255, 0.8) !important;
  font-weight: 500;
  padding: 0.5rem 1rem !important;
  border-radius: 5px;
  transition: var(--transition);
}

.navbar-nav .nav-link:hover {
  color: white !important;
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.dropdown-menu {
  background: rgba(44, 62, 80, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.dropdown-item {
  color: rgba(255, 255, 255, 0.8) !important;
  transition: var(--transition);
}

.dropdown-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white !important;
}

/* ===== CARDS ===== */
.card {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  border: none;
  margin-bottom: 2rem;
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-header {
  background: linear-gradient(135deg, var(--primary-color), #2980b9);
  color: white;
  border-bottom: none;
  padding: 1.5rem;
  font-weight: 600;
}

.card-body {
  padding: 2rem;
}

/* ===== FORMS ===== */
.form-control {
  border-radius: 5px;
  border: 2px solid #e6e6e6;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  transition: var(--transition);
  background-color: #ffffff !important;
  color: #333333 !important;
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.form-control[readonly] {
  background-color: #f8f9fa !important;
  color: #495057 !important;
}

.form-label {
  font-weight: 600;
  color: #333333 !important;
  margin-bottom: 8px;
  display: block;
}

.form-select {
  border-radius: 5px;
  border: 2px solid #e6e6e6;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  transition: var(--transition);
}

.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

/* ===== BUTTONS ===== */
.btn {
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), #2980b9);
  color: white;
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color), #219a52);
  color: white;
}

.btn-danger {
  background: linear-gradient(135deg, var(--accent-color), #c0392b);
  color: white;
}

.btn-warning {
  background: linear-gradient(135deg, var(--warning-color), #d68910);
  color: white;
}

.btn-info {
  background: linear-gradient(135deg, var(--info-color), #138496);
  color: white;
}

.btn-secondary {
  background: linear-gradient(135deg, #6c757d, #545b62);
  color: white;
}

.btn-outline-primary {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
}

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

.btn-outline-success {
  border: 2px solid var(--success-color);
  color: var(--success-color);
  background: transparent;
}

.btn-outline-success:hover {
  background: var(--success-color);
  color: white;
}

.btn-outline-secondary {
  border: 2px solid #6c757d;
  color: #6c757d;
  background: transparent;
}

.btn-outline-secondary:hover {
  background: #6c757d;
  color: white;
}

.btn-outline-info {
  border: 2px solid var(--info-color);
  color: var(--info-color);
  background: transparent;
}

.btn-outline-info:hover {
  background: var(--info-color);
  color: white;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* ===== ALERTS ===== */
.alert {
  border-radius: var(--border-radius);
  border: none;
  padding: 1rem 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--box-shadow);
}

.alert-danger {
  background: linear-gradient(135deg, #f8d7da, #f5c6cb);
  color: #721c24;
}

.alert-success {
  background: linear-gradient(135deg, #d4edda, #c3e6cb);
  color: #155724;
}

.alert-warning {
  background: linear-gradient(135deg, #fff3cd, #ffeaa7);
  color: #856404;
}

.alert-info {
  background: linear-gradient(135deg, #d1ecf1, #bee5eb);
  color: #0c5460;
}

/* ===== DASHBOARD ===== */
.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: white;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0.5rem 0;
  color: var(--primary-color);
}

.stat-label {
  font-size: 1rem;
  color: #7f8c8d;
}

/* ===== WEBCAM ===== */
.webcam-container {
  position: relative;
  width: 100%;
  height: 400px;
  background-color: #000;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 2rem;
  transition: all 0.3s ease;
}

.webcam-container.size-small {
  height: 200px;
}

.webcam-container.size-medium {
  height: 300px;
}

.webcam-container.size-large {
  height: 500px;
}

.webcam-container.size-xl {
  height: 600px;
}

/* Fullscreen mode */
.webcam-container.fullscreen {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 9999 !important;
  border-radius: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  background: #000 !important;
  transition: none !important;
  animation: none !important;
  transform: none !important;
}

.webcam-container.fullscreen .webcam-feed {
  width: 100% !important;
  height: 100% !important;
  object-fit: contain !important;
  transition: none !important;
  transform: none !important;
}

.webcam-container.fullscreen .camera-controls {
  top: 20px;
  right: 20px;
}

.webcam-container.fullscreen .resize-controls {
  bottom: 20px;
  right: 20px;
}

.webcam-feed {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
}

.camera-controls {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 1000;
  display: flex;
  gap: 5px;
}

.resize-controls {
  position: absolute;
  bottom: 10px;
  left: 10px;
  z-index: 1000;
  display: flex;
  gap: 5px;
}

.emotion-display {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 10px 15px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.emotion-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #28a745;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

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

.table th {
  background: linear-gradient(135deg, var(--secondary-color), #34495e);
  color: white;
  font-weight: 600;
  border: none;
  padding: 1rem;
}

.table td {
  padding: 1rem;
  border-bottom: 1px solid #eee;
  vertical-align: middle;
}

.table tbody tr:hover {
  background: #f8f9fa;
  transform: scale(1.01);
  transition: var(--transition);
}

/* ===== PROGRESS BARS ===== */
.progress {
  height: 8px;
  border-radius: 4px;
  background: #e9ecef;
  overflow: hidden;
}

.progress-bar {
  border-radius: 4px;
  transition: width 0.6s ease;
}

.progress-bar.bg-success {
  background: linear-gradient(135deg, var(--success-color), #219a52);
}

.progress-bar.bg-danger {
  background: linear-gradient(135deg, var(--accent-color), #c0392b);
}

.progress-bar.bg-warning {
  background: linear-gradient(135deg, var(--warning-color), #d68910);
}

/* ===== BADGES ===== */
.badge {
  padding: 0.5rem 0.75rem;
  border-radius: 50px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge.bg-success {
  background: linear-gradient(135deg, var(--success-color), #219a52);
}

.badge.bg-danger {
  background: linear-gradient(135deg, var(--accent-color), #c0392b);
}

.badge.bg-warning {
  background: linear-gradient(135deg, var(--warning-color), #d68910);
}

/* ===== FORM STYLING ===== */
.form-control, .form-select {
  border: 1px solid #ddd;
  border-radius: 5px;
  padding: 0.75rem;
  transition: var(--transition);
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.25);
  outline: none;
}

/* ===== TABS ===== */
.nav-tabs {
  border-bottom: 2px solid #dee2e6;
  margin-bottom: 1rem;
}

.nav-tabs .nav-link {
  border: none;
  background: transparent;
  color: #666;
  padding: 1rem 1.5rem;
  border-radius: 8px 8px 0 0;
  transition: var(--transition);
}

.nav-tabs .nav-link.active {
  background: linear-gradient(135deg, var(--primary-color), #2980b9);
  color: white;
  border-bottom: 2px solid var(--primary-color);
}

.nav-tabs .nav-link:hover:not(.active) {
  background: #f8f9fa;
  color: var(--primary-color);
}

/* ===== MODAL ===== */
.modal-content {
  border-radius: var(--border-radius);
  border: none;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.modal-header {
  background: linear-gradient(135deg, var(--primary-color), #2980b9);
  color: white;
  border-bottom: none;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

/* ===== SPINNER ===== */
.spinner-border {
  width: 1rem;
  height: 1rem;
  border-width: 2px;
}

/* ===== UTILITIES ===== */
.text-primary { color: var(--primary-color) !important; }
.text-success { color: var(--success-color) !important; }
.text-danger { color: var(--accent-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-info { color: var(--info-color) !important; }
.text-muted { color: #6c757d !important; }

.bg-primary { background: linear-gradient(135deg, var(--primary-color), #2980b9) !important; }
.bg-success { background: linear-gradient(135deg, var(--success-color), #219a52) !important; }
.bg-danger { background: linear-gradient(135deg, var(--accent-color), #c0392b) !important; }
.bg-warning { background: linear-gradient(135deg, var(--warning-color), #d68910) !important; }
.bg-info { background: linear-gradient(135deg, var(--info-color), #138496) !important; }

/* ===== FEATURE CARDS ===== */
.feature-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  border: none;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.feature-card i {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.feature-card h5 {
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

/* ===== CLASS CARDS ===== */
.class-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  border: none;
  margin-bottom: 1rem;
}

.class-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  background: transparent;
  padding: 0;
  margin-bottom: 1rem;
}

.breadcrumb-item a {
  color: var(--primary-color);
  text-decoration: none;
}

.breadcrumb-item.active {
  color: #6c757d;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .webcam-container {
    height: 250px;
  }
  
  .card-body {
    padding: 1rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }
  
  .dashboard-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 10px;
  }
  
  .webcam-container {
    height: 200px;
  }
  
  .camera-controls,
  .resize-controls {
    position: static;
    margin: 10px 0;
    justify-content: center;
  }
}

/* ===== LOADING STATES ===== */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid #f3f3f3;
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  border: none;
}

.toast-header {
  background: linear-gradient(135deg, var(--primary-color), #2980b9);
  color: white;
  border-bottom: none;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

/* ===== CUSTOM SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #2980b9;
}