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

:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #2a2a2a;
  --bg-hover: #3a3a3a;
  --text-primary: #ffffff;
  --text-secondary: #999999;
  --border-color: #333333;
  --accent-color: #4a9eff;
  --accent-hover: #3a8eef;
  --success-color: #4ade80;
  --danger-color: #ef4444;
  --warning-color: #fbbf24;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
}

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

/* Login page */
.login-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}

.login-container {
  width: 100%;
  max-width: 400px;
}

.login-card {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.login-header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.login-footer {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.login-footer p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Admin container */
.admin-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.admin-header {
  background: var(--bg-secondary);
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.header-logo {
  height: 50px;
  width: auto;
}

.header-titles {
  display: flex;
  flex-direction: column;
}

.header-left h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.header-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

/* Main content */
.admin-main {
  flex: 1;
  padding: 2rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

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

.stat-card {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: transform 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-color);
}

.stat-icon {
  font-size: 2.5rem;
}

.stat-content {
  flex: 1;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
}

/* Content sections */
.content-section {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 2rem;
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Form elements */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group small {
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.form-group input,
.form-group textarea {
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

.form-group textarea {
  resize: vertical;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

/* Upload area */
.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 1.5rem;
}

.upload-area:hover {
  border-color: var(--accent-color);
  background: var(--bg-tertiary);
}

.upload-area.dragover {
  border-color: var(--accent-color);
  background: var(--bg-tertiary);
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.upload-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.upload-hint {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* File info */
.file-info {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.file-info-content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.file-info-content span:first-child {
  font-weight: 500;
}

.file-info-content span:last-child {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Slug status */
.slug-status {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-weight: 500;
}

.slug-status.available {
  background: rgba(74, 222, 128, 0.2);
  color: var(--success-color);
}

.slug-status.unavailable {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger-color);
}

.slug-status.checking {
  color: var(--text-secondary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--accent-color);
}

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

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
  transform: translateY(-1px);
}

.btn-block {
  width: 100%;
}

.btn-icon {
  padding: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

/* Progress */
.upload-progress {
  margin-top: 1.5rem;
}

.progress-bar {
  background: var(--bg-tertiary);
  border-radius: 8px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  background: var(--accent-color);
  height: 100%;
  transition: width 0.3s;
}

.progress-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-align: center;
}

/* Loading and empty states */
.loading-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state p {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.empty-hint {
  font-size: 0.875rem;
}

.spinner {
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--accent-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

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

/* Flipbooks list */
.flipbooks-list {
  display: grid;
  gap: 1rem;
}

.flipbook-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: center;
  transition: border-color 0.2s;
}

.flipbook-item:hover {
  border-color: var(--accent-color);
}

.flipbook-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.flipbook-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.flipbook-meta span {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.flipbook-slug {
  display: inline-block;
  background: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  color: var(--accent-color);
}

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

.flipbook-actions button {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 2rem;
  max-width: 500px;
  width: 100%;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
}

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

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s;
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.modal-body {
  margin-bottom: 1.5rem;
}

.modal-body p {
  margin-bottom: 1rem;
}

.warning-text {
  color: var(--warning-color);
  font-weight: 500;
}

.delete-item-name {
  background: var(--bg-tertiary);
  padding: 0.75rem;
  border-radius: 6px;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

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

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s;
  z-index: 1000;
  max-width: 400px;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

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

.toast.error {
  border-color: var(--danger-color);
}

/* Error message */
.error-message {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger-color);
  padding: 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  border: 1px solid var(--danger-color);
}

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

  .admin-header {
    padding: 1rem;
  }

  .header-logo {
    height: 35px;
  }

  .header-left {
    gap: 0.75rem;
  }

  .header-left h1 {
    font-size: 1.25rem;
  }

  .header-subtitle {
    font-size: 0.75rem;
  }

  .content-section {
    padding: 1.5rem;
  }

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

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

  .flipbook-item {
    grid-template-columns: 1fr;
  }

  .flipbook-actions {
    justify-content: flex-start;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }

  .toast {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }
}