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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #f8fafc;
  color: #334155;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header design matching the image */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: #0ea5e9;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

.header-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: #64748b;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.welcome-text {
  color: #64748b;
  font-size: 0.95rem;
}

.logout-btn {
  color: #ef4444;
  background: none;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 500;
}

.logout-btn:hover {
  text-decoration: underline;
}

/* Welcome section design */
.welcome-section {
  margin-bottom: 3rem;
}

.welcome-title {
  font-size: 2rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 0.5rem;
}

.welcome-subtitle {
  color: #64748b;
  font-size: 1rem;
}

/* Stats cards design matching the image */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.stat-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.stat-icon.blue {
  background: #dbeafe;
  color: #2563eb;
}

.stat-icon.orange {
  background: #fed7aa;
  color: #ea580c;
}

.stat-icon.yellow {
  background: #fef3c7;
  color: #d97706;
}

.stat-content h3 {
  font-size: 0.875rem;
  color: #64748b;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.stat-content .stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: #1e293b;
}

/* Section cards design */
.section-card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  margin-bottom: 2rem;
}

.section-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid #e2e8f0;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: #64748b;
  font-size: 0.875rem;
}

.section-content {
  padding: 2rem;
}

/* Form elements */
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  background: white;
  color: #374151;
  font-size: 0.875rem;
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: #0ea5e9;
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #374151;
  font-size: 0.875rem;
}

.form-input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.875rem;
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: #0ea5e9;
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.875rem;
}

.btn-primary {
  background: #0ea5e9;
  color: white;
}

.btn-primary:hover {
  background: #0284c7;
}

.btn-secondary {
  background: #f1f5f9;
  color: #64748b;
  border: 1px solid #e2e8f0;
}

.btn-secondary:hover {
  background: #e2e8f0;
}

.btn-success {
  background: #10b981;
  color: white;
}

.btn-success:hover {
  background: #059669;
}

.btn-danger {
  background: #ef4444;
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1e293b;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #64748b;
}

/* Camera and scanning */
.camera-container {
  position: relative;
  width: 100%;
  max-width: 400px;
  margin: 0 auto 1rem;
}

.camera-preview {
  width: 100%;
  height: 300px;
  background: #f1f5f9;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #64748b;
  font-size: 0.875rem;
}

.scan-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 200px;
  border: 2px solid #0ea5e9;
  border-radius: 8px;
  pointer-events: none;
}

.scan-overlay::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border: 2px solid #0ea5e9;
  border-radius: 8px;
  animation: pulse 2s infinite;
}

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

/* Tables */
.attendance-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.attendance-table th,
.attendance-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

.attendance-table th {
  background: #f8fafc;
  font-weight: 600;
  color: #374151;
}

.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.status-present {
  background: #dcfce7;
  color: #166534;
}

.status-absent {
  background: #fee2e2;
  color: #991b1b;
}

/* Lists */
.student-list {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  margin-top: 1rem;
}

.student-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  border-bottom: 1px solid #e2e8f0;
}

.student-item:last-child {
  border-bottom: none;
}

.attendance-controls {
  display: flex;
  gap: 0.5rem;
}

.export-buttons {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  .header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}