:root {
  /* Colors */
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --accent-bg: rgba(56, 189, 248, 0.1);

  /* Neutrals */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border: #e2e8f0;
  --border-focus: #38bdf8;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  /* Status colors */
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;

  /* Border radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --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);

  /* Typography */
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'Space Mono', ui-monospace, Consolas, monospace;

  font-family: var(--font-body);
  line-height: 1.5;
  font-weight: 400;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
}

#root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Three-column layout */
.editor-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.sidebar {
  width: 320px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  overflow: auto;
  padding: 2rem;
}

.properties-panel {
  width: 280px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

button {
  font-family: inherit;
  cursor: pointer;
  outline: none;
}

button:focus-visible {
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent);
}

input, textarea, select {
  font-family: inherit;
}

/* App Layout - Three Column */
.app-layout {
  display: flex;
  min-height: 100vh;
  background: var(--bg-secondary);
}

.sidebar-container {
  width: 280px;
  background: var(--bg-primary);
  border-right: 1px solid var(--border);
  flex-shrink: 0;
  overflow-y: auto;
}

.canvas-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
  overflow-y: auto;
}

.properties-container {
  width: 260px;
  background: var(--bg-primary);
  border-left: 1px solid var(--border);
  flex-shrink: 0;
  overflow-y: auto;
}

.app-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  color: var(--text-primary);
}

.app-subtitle {
  color: var(--text-secondary);
  margin: 0;
  font-size: 0.875rem;
}

.canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  width: 100%;
  max-width: 400px;
}

.undo-redo-buttons {
  display: flex;
  gap: 0.5rem;
}

.icon-btn {
  padding: 0.5rem 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-secondary);
}

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

.icon-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.icon-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.canvas-wrapper {
  margin-bottom: 1rem;
}

.debug-info {
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  text-align: center;
}

.debug-info p {
  margin: 0.25rem 0;
}

.debug-info .tip {
  color: var(--text-muted);
  font-size: 12px;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
}

.sidebar-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.75rem 0.5rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.sidebar-tab:hover {
  background: var(--bg-primary);
}

.sidebar-tab.active {
  border-bottom-color: var(--accent);
  color: var(--text-primary);
}

.tab-icon {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.tab-label {
  font-size: 0.625rem;
}

.sidebar-content {
  padding: 1rem;
  flex: 1;
}

/* Upload Tab */
.upload-tab h3 {
  font-size: 0.875rem;
  margin: 0 0 1rem 0;
  color: var(--text-primary);
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-secondary);
}

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

.upload-zone.dragging {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.upload-zone.uploading {
  opacity: 0.7;
  pointer-events: none;
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.upload-zone p {
  margin: 0.25rem 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.upload-hint {
  font-size: 0.75rem !important;
  color: var(--text-muted) !important;
}

.uploading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Stickers Tab */
.stickers-tab h3 {
  font-size: 0.875rem;
  margin: 0 0 1rem 0;
}

.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.category-pill {
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.category-pill:hover {
  border-color: var(--accent);
}

.category-pill.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.sticker-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  max-height: 400px;
  overflow-y: auto;
}

.sticker-button {
  font-size: 1.5rem;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  cursor: pointer;
  transition: all 0.2s;
}

.sticker-button:hover {
  transform: scale(1.1);
  border-color: var(--accent);
}

/* Text Tab */
.text-tab h3 {
  font-size: 0.875rem;
  margin: 0 0 1rem 0;
}

.text-input-group {
  margin-bottom: 1rem;
}

.text-input-group label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.text-input,
.font-select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.text-input:focus,
.font-select:focus {
  outline: none;
  border-color: var(--accent);
}

.size-slider {
  width: 100%;
}

.color-picker-row {
  display: flex;
  gap: 0.5rem;
}

.color-picker {
  width: 40px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.color-input {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.add-text-btn {
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.add-text-btn:hover {
  background: var(--accent-hover);
}

.text-preview {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  text-align: center;
}

/* Templates Tab */
.templates-tab h3 {
  font-size: 0.875rem;
  margin: 0 0 1rem 0;
}

.templates-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  max-height: 400px;
  overflow-y: auto;
}

.template-card {
  display: flex;
  flex-direction: column;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.template-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.template-preview {
  height: 60px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  flex-wrap: wrap;
  padding: 0.25rem;
}

.template-preview-element {
  font-weight: 500;
}

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

.template-name {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-primary);
}

.template-category {
  font-size: 0.625rem;
  color: var(--text-muted);
}

/* Properties Panel */
.properties-panel {
  padding: 1rem;
}

.properties-panel h3 {
  font-size: 0.875rem;
  margin: 0 0 1rem 0;
  color: var(--text-primary);
}

.no-selection {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.element-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

.element-icon {
  font-size: 1.25rem;
}

.element-name {
  font-weight: 500;
  font-size: 0.875rem;
}

.property-group {
  margin-bottom: 1rem;
}

.property-group label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.property-row {
  display: flex;
  gap: 0.5rem;
}

.property-input {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.property-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 12px;
}

.property-input input {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  text-align: center;
}

.property-input input:focus {
  outline: none;
  border-color: var(--accent);
}

.rotation-slider {
  width: 100%;
}

.delete-btn {
  width: 100%;
  padding: 0.75rem;
  background: transparent;
  color: var(--error);
  border: 1px solid var(--error);
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.delete-btn:hover {
  background: var(--error);
  color: white;
}

.bg-removal-container {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.bg-removal-btn {
  width: 100%;
  padding: 0.75rem;
  background: linear-gradient(135deg, #8b5cf6, #ec4899);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.bg-removal-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.bg-removal-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.bg-removal-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin: 0.5rem 0 0 0;
  line-height: 1.4;
}

.spinner-small {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Filerobot Editor Overlay */
.filerobot-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.filerobot-container {
  width: 90%;
  height: 90%;
  background: #1e1e1e;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* Responsive */
@media (max-width: 900px) {
  .app-layout {
    flex-direction: column;
  }

  .sidebar-container,
  .properties-container {
    width: 100%;
    border: none;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-tabs {
    overflow-x: auto;
  }

  .sticker-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}