:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --success: #10b981;
  --success-light: #ecfdf5;
  --error: #ef4444;
  --error-light: #fee2e2;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --dark: #1f2937;
  --gray: #6b7280;
  --light-gray: #f3f4f6;
  --border: #e5e7eb;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: #f8fafc;
  color: var(--dark);
  line-height: 1.5;
  padding: 1rem;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.header {
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  color: var(--white);
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  position: relative;
}

.header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #f59e0b 0%, #ef4444 50%, #4f46e5 100%);
}

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

.logo {
  height: 3.5rem;
  width: auto;
  max-width: 200px;
  border-radius: var(--radius);
  object-fit: contain;
  border: 2px solid rgba(255, 255, 255, 0.2);
  background-color: var(--white);
  padding: 0.25rem;
  box-shadow: var(--shadow-sm);
}

.logo-fallback {
  height: 3.5rem;
  width: auto;
  max-width: 200px;
  border-radius: var(--radius);
  background-color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-sm);
}

.logo-fallback i {
  font-size: 1.5rem;
  color: var(--primary);
}

.school-info {
  text-align: left;
}

.school-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  letter-spacing: -0.5px;
}

.school-tagline {
  font-size: 0.875rem;
  opacity: 0.9;
  font-weight: 400;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.15);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  backdrop-filter: blur(5px);
}

.user-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.content {
  padding: 2rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--dark);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.form-row {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-col {
  flex: 1;
  min-width: 0;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--dark);
}

.input-wrapper {
  position: relative;
}

input, select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  transition: all 0.2s;
  background-color: var(--white);
  appearance: none;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.input-icon {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray);
  pointer-events: none;
}

.file-upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 1rem;
  background-color: var(--light-gray);
  position: relative;
  overflow: hidden;
}

.file-upload-area:hover {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.file-upload-area.active {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.file-upload-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.file-upload-text {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.file-upload-hint {
  color: var(--gray);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.file-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--dark);
  cursor: pointer;
  transition: all 0.2s;
}

.file-upload-btn:hover {
  background-color: var(--light-gray);
  border-color: var(--primary);
  color: var(--primary);
}

#fileInput {
  display: none;
}

.preview-section {
  margin-top: 2rem;
  background: var(--light-gray);
  padding: 1.5rem;
  border-radius: var(--radius);
}

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

.preview-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--dark);
}

.file-count {
  font-size: 0.875rem;
  color: var(--gray);
  font-weight: 500;
}

#preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.25rem;
}

.preview-item {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
  border: 1px solid var(--border);
  background: var(--white);
}

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

.preview-item img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  display: block;
}

.preview-item .file-info {
  padding: 0.75rem;
  background-color: var(--white);
}

.file-name {
  font-size: 0.8125rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.25rem;
  font-weight: 500;
}

.file-size {
  font-size: 0.75rem;
  color: var(--gray);
}

.preview-item .remove-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(239, 68, 68, 0.9);
  color: white;
  border: none;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s;
  font-size: 0.875rem;
}

.preview-item:hover .remove-btn {
  opacity: 1;
}

#status {
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: var(--radius-sm);
  display: none;
  font-size: 0.875rem;
}

.status-success {
  background: var(--success-light);
  color: var(--success);
  display: block;
  border-left: 4px solid var(--success);
}

.status-error {
  background: var(--error-light);
  color: var(--error);
  display: block;
  border-left: 4px solid var(--error);
}

.status-warning {
  background: var(--warning-light);
  color: var(--warning);
  display: block;
  border-left: 4px solid var(--warning);
}

.loading {
  display: none;
  text-align: center;
  margin: 1.5rem 0;
}

.spinner {
  border: 3px solid rgba(79, 70, 229, 0.1);
  border-radius: 50%;
  border-top: 3px solid var(--primary);
  width: 2.5rem;
  height: 2.5rem;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

.progress-container {
  width: 100%;
  background-color: var(--light-gray);
  border-radius: var(--radius);
  margin: 1.5rem 0;
  display: none;
  height: 0.75rem;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, #818cf8 100%);
  border-radius: var(--radius);
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.3) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.action-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 2rem;
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--dark);
  border-color: var(--border);
}

.btn-secondary:hover {
  background-color: var(--light-gray);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Login overlay styles */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.login-container {
  width: 100%;
  max-width: 400px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: fadeIn 0.3s ease;
}

.login-header {
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  color: var(--white);
  padding: 2rem;
  text-align: center;
}

.logo-container {
  display: flex;
  justify-content: center;
  margin-bottom: 1rem;
}

.login-logo {
  height: 4rem;
  width: auto;
  max-width: 200px;
  border-radius: var(--radius);
  object-fit: contain;
  border: 2px solid rgba(255, 255, 255, 0.2);
  background-color: var(--white);
  padding: 0.25rem;
}

.login-logo-fallback {
  height: 4rem;
  width: 4rem;
  border-radius: var(--radius);
  background-color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.login-logo-fallback i {
  font-size: 2rem;
  color: var(--primary);
}

.login-content {
  padding: 2rem;
}

.login-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--dark);
}

.login-btn {
  width: 100%;
  padding: 0.75rem 1.5rem;
  background-color: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.login-btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.login-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.status-message {
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  display: none;
}

.login-status-error {
  background-color: #fef2f2;
  color: var(--error);
  border: 1px solid #fecaca;
  display: block;
}

.login-status-success {
  background-color: #f0fdf4;
  color: var(--success);
  border: 1px solid #bbf7d0;
  display: block;
}

.login-loading {
  display: none;
  text-align: center;
  margin: 1rem 0;
}

.login-spinner {
  border: 2px solid rgba(79, 70, 229, 0.1);
  border-radius: 50%;
  border-top: 2px solid var(--primary);
  width: 1.25rem;
  height: 1.25rem;
  animation: spin 1s linear infinite;
  display: inline-block;
  margin-right: 0.5rem;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Tabs Navigation */
.tabs-navigation {
  display: flex;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

.tab-button {
  padding: 1rem 1.5rem;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
}

.tab-button:hover {
  color: var(--primary);
}

.tab-button.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background-color: var(--primary-light);
}

.tab-content {
  display: none;
  padding: 2rem;
}

.tab-content.active {
  display: block;
}

/* Folders Section */
.folders-section {
  margin-bottom: 2rem;
}

.folders-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.folders-controls select {
  flex: 1;
}

.view-folders-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
}

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

.links-container {
  margin-top: 1.5rem;
}

.links-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.links-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

.copy-all-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
}

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

.links-content {
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1rem;
  max-height: 400px;
  overflow-y: auto;
}

.links-content::-webkit-scrollbar {
  width: 6px;
}

.links-content::-webkit-scrollbar-track {
  background: var(--light-gray);
  border-radius: 3px;
}

.links-content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.links-content::-webkit-scrollbar-thumb:hover {
  background: var(--gray);
}

.folder-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  background: white;
  margin-bottom: 1rem;
}

.folder-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.folder-title h4 {
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.folder-subtitle {
  font-size: 0.875rem;
  color: var(--gray);
}

.folder-actions {
  display: flex;
  gap: 0.5rem;
}

.copy-folder-btn {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.75rem;
  background: var(--primary-light);
  color: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  text-decoration: none;
}

.copy-folder-btn:hover {
  background: #e0e7ff;
}

.event-header {
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  color: white;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.event-copy-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.75rem;
}

.event-copy-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.link-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  background: var(--light-gray);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.link-item-content {
  flex: 1;
  min-width: 0;
}

.link-header {
  font-size: 0.75rem;
  color: var(--gray);
  margin-bottom: 0.25rem;
}

.link-url {
  font-size: 0.875rem;
  word-break: break-all;
}

.link-actions {
  display: flex;
  gap: 0.25rem;
}

.link-action-btn {
  padding: 0.25rem;
  color: var(--primary);
  border: none;
  background: none;
  cursor: pointer;
  text-decoration: none;
}

.link-copy-btn {
  color: var(--success);
}

/* Copy notification */
.copy-notification {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--success);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 1000;
  animation: slideIn 0.3s ease, fadeOut 0.3s ease 1.7s;
  animation-fill-mode: forwards;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* Recent Folders Section */
.recent-folders-section {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

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

.section-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--dark);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.refresh-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

.recent-folders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.recent-folder-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  background: var(--white);
  transition: all 0.2s;
}

.recent-folder-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}

.recent-folder-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.recent-folder-info {
  flex: 1;
}

.recent-folder-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--dark);
}

.recent-folder-subtitle {
  font-size: 0.875rem;
  color: var(--gray);
}

.recent-folder-time {
  font-size: 0.75rem;
  color: var(--gray);
  background: var(--light-gray);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.recent-folder-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.recent-folder-url {
  flex: 1;
  font-size: 0.8125rem;
  color: var(--gray);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.recent-folder-btn {
  padding: 0.375rem 0.75rem;
  background: var(--primary-light);
  color: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.recent-folder-btn:hover {
  background: #e0e7ff;
}

.recent-folder-btn.copy {
  background: var(--success-light);
  color: var(--success);
}

.recent-folder-btn.copy:hover {
  background: #d1fae5;
}

.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--gray);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state p {
  margin-bottom: 0.5rem;
}

.loading-recent {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
}

.loading-recent .spinner {
  width: 2rem;
  height: 2rem;
  margin-bottom: 1rem;
}

/* Badge for recent tab */
.tab-button .badge {
  position: absolute;
  top: -5px;
  right: -5px;
  background: var(--success);
  color: white;
  font-size: 0.625rem;
  padding: 0.125rem 0.375rem;
  border-radius: 50%;
  min-width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Add animation for new items */
@keyframes highlightNew {
  0% { background-color: var(--success-light); }
  100% { background-color: transparent; }
}

.new-folder {
  animation: highlightNew 2s ease;
}

/* Watermark Toggle */
.watermark-toggle {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--light-gray);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.toggle-label {
  font-weight: 500;
  color: var(--dark);
  flex: 1;
}

.toggle-description {
  font-size: 0.875rem;
  color: var(--gray);
  margin-top: 0.25rem;
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 30px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--gray);
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(30px);
}

.watermark-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.watermark-on {
  color: var(--success);
}

.watermark-off {
  color: var(--error);
}

/* Delete Tab specific styles */
.delete-warning {
  background: #fef3c7;
  border: 1px solid #f59e0b;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.delete-warning-icon {
  color: #d97706;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.delete-warning-content h3 {
  color: #92400e;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.delete-warning-content p {
  color: #78350f;
  font-size: 0.875rem;
  line-height: 1.5;
}

.events-container {
  display: grid;
  gap: 1.5rem;
}

.event-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.event-card:hover {
  box-shadow: var(--shadow);
}

.event-header {
  background: var(--light-gray);
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.event-title {
  font-weight: 600;
  color: var(--dark);
  font-size: 1.125rem;
}

.event-info {
  display: flex;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--gray);
}

.event-info-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.event-actions {
  display: flex;
  gap: 0.5rem;
}

.delete-event-btn {
  padding: 0.5rem 1rem;
  background: var(--error);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.delete-event-btn:hover {
  background: #dc2626;
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.event-details {
  padding: 1.5rem;
}

.classes-list {
  display: grid;
  gap: 1rem;
}

.class-item {
  background: var(--light-gray);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.class-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.class-icon {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.class-details {
  flex: 1;
}

.class-name {
  font-weight: 500;
  color: var(--dark);
  margin-bottom: 0.25rem;
}

.class-stats {
  font-size: 0.75rem;
  color: var(--gray);
  display: flex;
  gap: 1rem;
}

.class-actions {
  display: flex;
  gap: 0.5rem;
}

.view-class-btn {
  padding: 0.5rem 1rem;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.view-class-btn:hover {
  background: #e0e7ff;
}

.delete-class-btn {
  padding: 0.5rem 1rem;
  background: var(--error-light);
  color: var(--error);
  border: 1px solid #fecaca;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.delete-class-btn:hover {
  background: #fee2e2;
}

.loading-delete {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem;
}

.loading-delete .spinner {
  width: 2rem;
  height: 2rem;
  margin-bottom: 1rem;
}

/* Confirmation Modal */
.confirmation-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 1rem;
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 500px;
  animation: fadeIn 0.3s ease;
}

.modal-header {
  background: var(--error);
  color: white;
  padding: 1.5rem;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.modal-body {
  padding: 2rem;
}

.modal-body p {
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.modal-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

.modal-cancel-btn {
  padding: 0.75rem 1.5rem;
  background: var(--white);
  color: var(--dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

.modal-cancel-btn:hover {
  background: var(--light-gray);
}

.modal-confirm-btn {
  padding: 0.75rem 1.5rem;
  background: var(--error);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

.modal-confirm-btn:hover {
  background: #dc2626;
}

/* WhatsApp tab improvements */
#whatsappPreview {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  white-space: pre-wrap;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  max-height: 300px;
  overflow-y: auto;
  color: var(--dark);
  background-color: #f8f9fa;
}

#whatsappPreview::before {
  content: '📱 WhatsApp Message Preview:';
  display: block;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.whatsapp-tips {
  background: linear-gradient(135deg, #25D36615 0%, #128C7E15 100%);
  border: 1px solid #25D36630;
  margin-top: 2rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  border-left: 4px solid var(--success);
}

.whatsapp-tips h4 {
  color: #128C7E;
  margin-bottom: 0.5rem;
}

#copyWhatsAppBtn:disabled,
#openWhatsAppBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#copyWhatsAppBtn:not(:disabled):hover {
  background-color: var(--success);
  color: white;
  border-color: var(--success);
}

@media (max-width: 768px) {
  .header {
    flex-direction: column;
    text-align: center;
  }
  
  .brand {
    justify-content: center;
  }
  
  .user-info {
    justify-content: center;
    width: 100%;
  }
  
  .form-row {
    flex-direction: column;
    gap: 1.25rem;
  }
  
  #preview {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  
  .action-buttons {
    flex-direction: column;
  }
  
  button {
    width: 100%;
  }
  
  .folders-controls {
    flex-direction: column;
  }
  
  .folders-controls select,
  .view-folders-btn {
    width: 100%;
  }
  
  .tabs-navigation {
    flex-direction: column;
  }
  
  .tab-button {
    justify-content: center;
    border-bottom: none;
    border-left: 3px solid transparent;
  }
  
  .tab-button.active {
    border-left-color: var(--primary);
    border-bottom-color: transparent;
  }
  
  .recent-folders-grid {
    grid-template-columns: 1fr;
  }
  
  .event-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .event-actions {
    width: 100%;
  }
  
  .delete-event-btn {
    width: 100%;
    justify-content: center;
  }
  
  .class-item {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  
  .class-actions {
    width: 100%;
  }
  
  .view-class-btn,
  .delete-class-btn {
    width: 100%;
    justify-content: center;
  }
  
  .modal-actions {
    flex-direction: column;
  }
  
  .modal-cancel-btn,
  .modal-confirm-btn {
    width: 100%;
  }

  .recent-folder-actions {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .recent-folder-url {
    width: 100%;
    text-align: center;
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
  }
  
  .recent-folder-btn {
    width: 100%;
    justify-content: center;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    min-height: 44px;
  }
  
  .recent-folder-btn.copy {
    width: 100%;
    background: var(--success-light);
    color: var(--success);
    border: 2px solid var(--success);
  }

  .recent-folder-card {
    padding: 1rem;
    margin-bottom: 1rem;
  }
}