:root {
  /* Vanilla CSS Vars for Light Theme (Premium Vibe) */
  --bg-color: #f8fafc;
  --surface-color: #ffffff;
  --surface-hover: #f1f5f9;
  --border-color: #e2e8f0;

  --text-main: #0f172a;
  --text-muted: #64748b;

  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #eff6ff;

  --secondary-color: #10b981;
  --secondary-hover: #059669;

  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: #fef2f2;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.25s ease-in-out;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --surface-color: #1e293b;
  --surface-hover: #334155;
  --border-color: #334155;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;

  --primary-color: #3b82f6;
  /* Blue */
  --primary-hover: #60a5fa;
  --primary-light: #1e3a8a;

  --secondary-color: #10b981;
  --secondary-hover: #34d399;

  --danger-color: #ef4444;
  --danger-hover: #f87171;
  --danger-light: #7f1d1d;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2.5rem;
}

.header-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--primary-color);
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.025em;
}

.header-content p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

.theme-toggle {
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  background-color: var(--surface-hover);
  transform: scale(1.05);
}

/* Common Card Style */
.card {
  background-color: var(--surface-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
  background-color: var(--secondary-hover);
  transform: translateY(-1px);
}

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

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

.btn-text {
  background-color: transparent;
  color: var(--text-muted);
}

.btn-text:hover {
  color: var(--text-main);
  background-color: var(--surface-hover);
}

.btn-icon {
  padding: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-md);
  display: inline-flex;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background-color: var(--surface-hover);
  color: var(--text-main);
}

.btn-icon.delete:hover {
  color: var(--danger-color);
  background-color: var(--danger-light);
}

.btn-icon.edit:hover {
  color: var(--primary-color);
  background-color: var(--primary-light);
}

/* Utilities */
.hidden {
  display: none !important;
}

.hidden-input {
  display: none;
}

.mt-3 {
  margin-top: 1rem;
}

/* Upload Area */
.upload-area {
  padding: 4rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 2px dashed var(--border-color);
  background-color: transparent;
  box-shadow: none;
  transition: all var(--transition-normal);
}

.upload-area.dragover {
  border-color: var(--primary-color);
  background-color: var(--primary-light);
  transform: scale(1.01);
}

.upload-icon {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  opacity: 0.8;
}

.upload-area h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.upload-area p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.upload-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

/* Editor Section */
.editor-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.editor-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.editor-info h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.editor-controls {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.control-group label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.select-input,
.text-input-sm {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.select-input:focus,
.text-input-sm:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px var(--primary-light);
}

.highlight {
  color: var(--primary-color);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  background-color: var(--surface-hover);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  width: fit-content;
}

.editor-actions {
  display: flex;
  gap: 0.75rem;
}

/* Table */
.table-container {
  width: 100%;
}

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th,
td {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--surface-color);
  position: sticky;
  top: 0;
}

tbody tr {
  transition: background-color var(--transition-fast);
}

tbody tr:hover {
  background-color: var(--surface-hover);
}

.actions-col {
  width: 120px;
  text-align: right;
}

.table-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* Empty State */
.empty-state {
  padding: 4rem 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.empty-icon {
  color: var(--text-muted);
  opacity: 0.5;
  margin-bottom: 1rem;
}

.empty-state h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--text-muted);
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  opacity: 1;
  visibility: visible;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.modal-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  display: flex !important;
  /* Keep flex for transition to work, visibility hides it */
  pointer-events: none;
}

.modal {
  width: 100%;
  max-width: 500px;
  padding: 2rem;
  transform: translateY(0);
  transition: transform var(--transition-normal);
}

.modal-overlay.hidden .modal {
  transform: translateY(20px);
}

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

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-group.half {
  flex: 1;
}

.form-group {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

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

/* Responsive */
@media (max-width: 768px) {
  .editor-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .editor-actions {
    width: 100%;
    margin-top: 1rem;
  }

  .editor-actions .btn {
    flex: 1;
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }
}