:root {
  --bg: #0f172a;
  --surface: #111827;
  --accent: #3b82f6;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
}

/* Layout */
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: #020617;
  color: var(--text);
  height: 100vh;
  display: flex;
}
.app {
  display: grid;
  grid-template-columns: 320px 1fr;
  width: 100%;
}

/* Sidebar */
.sidebar {
  background: #020617;
  border-right: 1px solid #1f2937;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
}
.title {
  margin: 0;
  font-size: 14px;
}
.sidebar-section {
  padding: 8px;
  border-radius: 10px;
  background: #020617;
  border: 1px solid #1f2937;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.section-title {
  font-size: 12px;
  font-weight: 600;
}
.section-subtitle {
  font-size: 11px;
  font-weight: 600;
  margin-top: 4px;
}

/* Inputs */
.input, .select, .textarea {
  width: 100%;
  border-radius: 8px;
  border: 1px solid #1f2937;
  background: #020617;
  color: var(--text);
  font-size: 12px;
  padding: 6px 8px;
  box-sizing: border-box;
}
.textarea {
  min-height: 80px;
  resize: vertical;
}

/* Buttons */
.btn {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid #1f2937;
  background: #0b1120;
  color: var(--text);
  cursor: pointer;
  font-size: 12px;
}
.btn-sm {
  font-size: 11px;
  padding: 4px 8px;
}
.btn-primary {
  background: var(--accent);
  color: #020617;
}
.btn-danger {
  background: #b91c1c;
  color: #f9fafb;
}

/* Palette list */
.palette-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 260px;
  overflow-y: auto;
}
.palette-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: 8px;
  background: #0b1120;
  border: 1px solid #1f2937;
  cursor: pointer;
}
.palette-item.active {
  border-color: var(--accent);
}
.palette-item.dragging {
  opacity: 0.4;
}
.palette-swatch {
  display: flex;
  gap: 2px;
}
.palette-swatch span {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}
.palette-name {
  font-size: 12px;
}
.palette-meta {
  font-size: 10px;
  color: var(--text-muted);
}

/* HSL Panel */
.hsl-panel {
  padding: 10px;
  border-radius: 12px;
  background: #0b1120;
  border: 1px solid #1f2937;
}
.hsl-panel h4 {
  margin: 0 0 4px;
  font-size: 12px;
}
.hsl-panel label {
  font-size: 11px;
  margin-top: 6px;
  display: block;
}
.hsl-panel input[type="range"] {
  width: 100%;
}

/* Main */
.main {
  background: var(--bg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
}
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.badge {
  padding: 2px 8px;
  border-radius: 999px;
  background: #0b1120;
  border: 1px solid #1f2937;
  font-size: 11px;
}
.top-actions {
  display: flex;
  gap: 6px;
}

/* Sections */
.section {
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid #1f2937;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.section-title {
  font-size: 13px;
  margin: 0;
}
.tag {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 999px;
  border: 1px solid #1f2937;
  color: var(--text-muted);
}

/* Palette preview row */
.palette-preview-row {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 10px;
}
.swatch-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.swatch-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
}
.swatch-color {
  width: 32px;
  height: 18px;
  border-radius: 6px;
  border: 1px solid #020617;
}
.swatch-label {
  min-width: 70px;
}
.swatch-code {
  color: var(--text-muted);
}

/* AI text */
.ai-text-block {
  border-radius: 10px;
  border: 1px solid #1f2937;
  background: #020617;
  padding: 8px;
  font-size: 11px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.ai-text {
  font-size: 11px;
  color: var(--text-muted);
}

/* Preview & templates */
.preview-layout {
  display: grid;
  grid-template-columns: 2fr 1.2fr;
  gap: 10px;
}
.template-switch {
  display: flex;
  gap: 6px;
}
.template-btn {
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid #1f2937;
  background: #0b1120;
  color: var(--text);
  cursor: pointer;
  font-size: 11px;
}
.template-btn.active {
  background: var(--accent);
  color: #020617;
}
.preview {
  background: var(--bg);
  border-radius: 10px;
  border: 1px solid #1f2937;
  padding: 12px;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 10px;
}
.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}
.preview-body {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 10px;
}
.preview-card,
.preview-side-card {
  background: var(--surface);
  border: 1px solid #1f2937;
  border-radius: 10px;
  padding: 10px;
  cursor: move;
  font-size: 11px;
}
.preview-card.drag-over,
.preview-side-card.drag-over {
  outline: 2px dashed var(--accent);
}
.template-editor {
  border-radius: 10px;
  border: 1px solid #1f2937;
  background: #020617;
  padding: 8px;
  font-size: 11px;
}
.hint {
  font-size: 10px;
  color: var(--text-muted);
}

/* Code block */
.code-block {
  background: #020617;
  border-radius: 8px;
  border: 1px solid #1f2937;
  padding: 6px;
  font-size: 10px;
  overflow-x: auto;
}

/* Contrast */
.contrast-layout {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 10px;
}
.heatmap-title {
  margin: 0 0 4px;
  font-size: 12px;
}
.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 4px;
}
.heat-cell {
  padding: 4px;
  border-radius: 6px;
  font-size: 10px;
  text-align: center;
  white-space: pre-line;
  color: #020617;
}

/* Responsive */
@media (max-width: 960px) {
  .app {
    grid-template-columns: 1fr;
  }
  .sidebar {
    max-height: 260px;
    overflow-y: auto;
  }
  .preview-layout,
  .palette-preview-row,
  .contrast-layout {
    grid-template-columns: 1fr;
  }
}