/* ============================================
   Design Tokens - Notion-like SaaS Style
   ============================================ */
   :root {
    --bg-primary: #ffffff;
    --bg-secondary: #f7f6f3;
    --bg-tertiary: #fbfbfa;
    --bg-hover: #efefef;
    --bg-active: #e8e7e4;
    --text-primary: #37352f;
    --text-secondary: #787774;
    --text-tertiary: #9b9a97;
    --border: #e3e2de;
    --border-light: #eeede9;
    --accent: #2eaadc;
    --accent-hover: #2496c4;
    --accent-light: #e8f4f8;
    --success: #4dab9a;
    --warning: #cb912f;
    --danger: #e03e3e;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
    --font-mono: "SF Mono", "Menlo", "Monaco", monospace;
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 14px;
    --font-size-md: 16px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --line-height: 1.6;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);
    --transition: 150ms ease;
  }
  
  /* ============================================
     Reset & Base
     ============================================ */
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: var(--line-height);
    min-height: 100vh;
  }
  
  /* ============================================
     App Shell
     ============================================ */
  .app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
  }
  
  .app-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-lg);
    height: 48px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    z-index: 10;
  }
  
  .app-logo {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    letter-spacing: -0.01em;
  }

  .app-version {
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--text-tertiary);
    margin-left: 4px;
  }
  
  /* ============================================
     Stepper
     ============================================ */
  .stepper {
    display: flex;
    align-items: center;
    gap: 0;
    flex: 1;
  }
  
  .step-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition);
    white-space: nowrap;
    user-select: none;
  }
  
  .step-indicator:hover {
    background: var(--bg-hover);
  }
  
  .step-indicator .step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    font-size: var(--font-size-xs);
    font-weight: 600;
    background: var(--bg-secondary);
    color: var(--text-tertiary);
    transition: all var(--transition);
  }
  
  .step-indicator .step-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: color var(--transition);
  }
  
  .step-indicator.active .step-number {
    background: var(--accent);
    color: #fff;
  }
  
  .step-indicator.active .step-label {
    color: var(--text-primary);
    font-weight: 500;
  }
  
  .step-indicator.completed .step-number {
    background: var(--success);
    color: #fff;
  }
  
  .step-indicator.completed .step-number::after {
    content: "✓";
    font-size: 11px;
  }
  
  .step-indicator.completed .step-number span {
    display: none;
  }
  
  .step-connector {
    width: 16px;
    height: 1px;
    background: var(--border);
    flex-shrink: 0;
  }
  
  /* ============================================
     Main Layout
     ============================================ */
  .main-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    flex: 1;
    overflow: hidden;
  }
  
  /* ============================================
     Input Panel
     ============================================ */
  .input-panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-primary);
  }
  
  .step-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl) var(--spacing-2xl);
  }
  
  .step-container[hidden] {
    display: none;
  }
  
  .step-nav {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-2xl);
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
    flex-shrink: 0;
  }
  
  /* ============================================
     Preview Panel
     ============================================ */
  .preview-panel {
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border);
    background: var(--bg-secondary);
    overflow: hidden;
  }
  
  .preview-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border);
    background: var(--bg-tertiary);
    flex-shrink: 0;
  }
  
  .preview-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
  }
  
  .preview-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
  }
  
  /* ============================================
     Buttons
     ============================================ */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    user-select: none;
    height: 36px;
    min-width: 80px;
  }
  
  .btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
  }
  
  .btn-primary {
    background: var(--accent);
    color: #fff;
  }
  
  .btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
  }
  
  .btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
  }
  
  .btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
  }
  
  .btn-danger {
    background: var(--bg-primary);
    color: var(--danger);
    border: 1px solid var(--border);
  }
  
  .btn-danger:hover:not(:disabled) {
    background: #fdf2f2;
  }
  
  .btn-ghost {
    background: transparent;
    color: var(--text-secondary);
  }
  
  .btn-ghost:hover:not(:disabled) {
    background: var(--bg-hover);
    color: var(--text-primary);
  }
  
  .btn-sm {
    height: 28px;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    min-width: auto;
  }
  
  .btn-lg {
    height: 44px;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-md);
  }
  
  /* ============================================
     Form Elements
     ============================================ */
  .form-group {
    margin-bottom: var(--spacing-lg);
  }
  
  .form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
  }
  
  .form-label .required {
    color: var(--danger);
    margin-left: 2px;
  }
  
  .form-input,
  .form-select,
  .form-textarea {
    width: 100%;
    padding: var(--spacing-sm) 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
  }
  
  .form-input:focus,
  .form-select:focus,
  .form-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
  }
  
  .form-input::placeholder,
  .form-textarea::placeholder {
    color: var(--text-tertiary);
  }
  
  .form-textarea {
    resize: vertical;
    min-height: 80px;
  }
  
  .form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23787774' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 32px;
    cursor: pointer;
  }
  
  .form-hint {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
  }
  
  .form-error {
    font-size: var(--font-size-xs);
    color: var(--danger);
    margin-top: var(--spacing-xs);
  }
  
  .form-row {
    display: flex;
    gap: var(--spacing-md);
  }
  
  .form-row > * {
    flex: 1;
  }
  
  .form-inline {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }
  
  /* ============================================
     Checkbox & Radio
     ============================================ */
  .form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    user-select: none;
  }
  
  .form-check input[type="checkbox"],
  .form-check input[type="radio"] {
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
    cursor: pointer;
  }
  
  /* ============================================
     Color Picker
     ============================================ */
  .color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }
  
  .color-picker-wrapper input[type="color"] {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 2px;
  }
  
  /* ============================================
     File Upload
     ============================================ */
  .file-upload {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg-tertiary);
  }
  
  .file-upload:hover {
    border-color: var(--accent);
    background: var(--accent-light);
  }
  
  .file-upload-icon {
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-tertiary);
  }
  
  .file-upload-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
  }
  
  .file-upload-hint {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
  }
  
  /* ============================================
     Section Headers
     ============================================ */
  .section-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
  }
  
  .section-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
  }
  
  .subsection-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-light);
  }
  
  /* ============================================
     Cards
     ============================================ */
  .card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    transition: box-shadow var(--transition);
  }
  
  .card:hover {
    box-shadow: var(--shadow-sm);
  }
  
  .card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
  }
  
  .card-title {
    font-size: var(--font-size-base);
    font-weight: 600;
  }
  
  /* ============================================
     Design Item (Step 1)
     ============================================ */
  .design-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    background: var(--bg-primary);
    position: relative;
  }
  
  .design-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
  }
  
  .design-item-number {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent);
  }
  
  .design-thumbnail {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: var(--radius-md);
    background: #fafafa;
    border: 1px solid var(--border-light);
    margin-bottom: var(--spacing-md);
  }
  
  /* ============================================
     Size Grid (Step 2)
     ============================================ */
  .size-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .size-chip {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 52px;
    height: 36px;
    padding: 0 var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    user-select: none;
  }
  
  .size-chip:hover {
    border-color: var(--accent);
  }
  
  .size-chip.selected {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
  }
  
  /* ============================================
     Tag Options (Step 3)
     ============================================ */
  .tag-option-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
  }
  
  .tag-option {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition);
  }
  
  .tag-option:hover {
    border-color: var(--accent);
  }
  
  .tag-option.selected {
    border-color: var(--accent);
    background: var(--accent-light);
  }
  
  /* ============================================
     Preview Styles
     ============================================ */
  .preview-spec {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    font-size: var(--font-size-sm);
  }
  
  /* Professional document header */
  .preview-doc-header {
    text-align: center;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid #2c2c2c;
    margin-bottom: var(--spacing-lg);
  }
  
  .preview-doc-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.15em;
    margin-bottom: 2px;
  }
  
  .preview-doc-subtitle {
    font-size: 10px;
    color: #888;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
  }
  
  .preview-header-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 11px;
    margin-top: var(--spacing-sm);
  }
  
  .preview-header-table th {
    text-align: left;
    font-weight: 500;
    color: #666;
    padding: 3px 8px;
    background: #f7f7f7;
    border: 1px solid #ddd;
    width: 80px;
    white-space: nowrap;
  }
  
  .preview-header-table td {
    padding: 3px 8px;
    border: 1px solid #ddd;
  }
  
  /* Legacy header (kept for compat) */
  .preview-spec-header {
    text-align: center;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--text-primary);
    margin-bottom: var(--spacing-lg);
  }
  
  .preview-spec-header h2 {
    font-size: var(--font-size-md);
    font-weight: 700;
    letter-spacing: 0.1em;
  }
  
  /* Design drafts grid */
  .preview-drafts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-sm);
  }
  
  .preview-draft-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #fafafa;
  }
  
  .preview-draft-image {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f0f0f0;
    padding: 4px;
  }
  
  .preview-draft-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
  }
  
  .preview-draft-info {
    padding: 6px 8px;
    border-top: 1px solid var(--border-light);
  }
  
  /* Print processing blocks */
  .preview-print-block {
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
  }
  
  .preview-print-block-header {
    font-size: 11px;
    font-weight: 600;
    padding: 4px 8px;
    background: #f0f4f8;
    border-bottom: 1px solid var(--border-light);
  }
  
  .preview-print-block .preview-row {
    padding: 3px 8px;
  }
  
  .preview-print-block .preview-row-label {
    width: 100px;
  }
  
  .preview-section {
    margin-bottom: var(--spacing-lg);
  }
  
  .preview-section-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
  }
  
  .preview-row {
    display: flex;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-light);
    font-size: var(--font-size-sm);
  }
  
  .preview-row-label {
    width: 120px;
    flex-shrink: 0;
    color: var(--text-secondary);
  }
  
  .preview-row-value {
    flex: 1;
    color: var(--text-primary);
  }
  
  .preview-body-diagram {
    width: 100%;
    background: #f5f5f5;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
  }
  
  .preview-body-image {
    width: 100%;
    height: auto;
    display: block;
    z-index: 1;
  }

  .preview-body-diagram svg {
    width: 100%;
    height: auto;
    display: block;
    z-index: 1;
  }
  
  .preview-design-marker {
    position: absolute;
    z-index: 2;
  }
  
  .preview-design-marker {
    transform-origin: center center;
  }

  .preview-design-marker img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
  }

  .rotate-handle:hover {
    transform: translateX(-50%) scale(1.2);
    background: #1a8fc0 !important;
  }
  
  .preview-tag-marker {
    position: absolute;
    z-index: 3;
  }
  
  .preview-tag-marker-label {
    max-width: 72px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  .preview-annotation {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    padding: var(--spacing-xs) 0;
    border-left: 2px solid var(--accent);
    padding-left: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
  }
  
  .preview-color-swatch {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 3px;
    border: 1px solid var(--border);
    vertical-align: middle;
    margin-right: var(--spacing-xs);
  }
  
  /* Tag placement markers on design map */
  .preview-tag-marker {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    pointer-events: auto;
    z-index: 2;
    white-space: nowrap;
    cursor: move;
    touch-action: none;
    transform: translate(-50%, -4px);
  }
  
  .preview-tag-marker-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #2eaadc;
    border: 1.5px solid #fff;
    box-shadow: 0 0 0 1px #2eaadc;
    flex-shrink: 0;
  }
  
  .preview-tag-marker-label {
    font-size: 7px;
    font-weight: 600;
    color: #fff;
    background: rgba(46, 170, 220, 0.85);
    padding: 1px 4px;
    border-radius: 2px;
    line-height: 1.3;
  }
  
  .preview-tag-marker-line {
    position: absolute;
    border-left: 1px dashed #2eaadc;
    pointer-events: none;
    z-index: 1;
  }
  
  /* ============================================
     Confirmation (Step 5)
     ============================================ */
  .confirm-section {
    margin-bottom: var(--spacing-lg);
  }
  
  .confirm-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
  }
  
  .confirm-edit-link {
    font-size: var(--font-size-xs);
    color: var(--accent);
    cursor: pointer;
    text-decoration: none;
  }
  
  .confirm-edit-link:hover {
    text-decoration: underline;
  }
  
  .confirm-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
  }
  
  .confirm-table th {
    text-align: left;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    width: 140px;
  }
  
  .confirm-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
  }
  
  /* ============================================
     PDF Export (Step 6)
     ============================================ */
  .export-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
  }
  
  .export-option {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    text-align: center;
    transition: all var(--transition);
  }
  
  .export-option:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
  }
  
  .export-option.selected {
    border-color: var(--accent);
    background: var(--accent-light);
  }
  
  .export-option-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-top: var(--spacing-sm);
  }
  
  .export-option-icon {
    font-size: 32px;
    color: var(--text-tertiary);
  }
  
  .export-progress {
    display: none;
    text-align: center;
    padding: var(--spacing-xl);
  }
  
  .export-progress.active {
    display: block;
  }
  
  .export-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--spacing-md);
  }
  
  @keyframes spin {
    to { transform: rotate(360deg); }
  }
  
  /* ============================================
     Warning & Validation
     ============================================ */
  .warning-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 2px var(--spacing-sm);
    background: #fef3cd;
    color: #856404;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
  }
  
  .validation-msg {
    padding: var(--spacing-sm) var(--spacing-md);
    background: #fdf2f2;
    border: 1px solid #f5c6c6;
    border-radius: var(--radius-md);
    color: var(--danger);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
  }
  
  /* ============================================
     Utilities
     ============================================ */
  .mt-sm { margin-top: var(--spacing-sm); }
  .mt-md { margin-top: var(--spacing-md); }
  .mt-lg { margin-top: var(--spacing-lg); }
  .mb-sm { margin-bottom: var(--spacing-sm); }
  .mb-md { margin-bottom: var(--spacing-md); }
  .mb-lg { margin-bottom: var(--spacing-lg); }
  .text-center { text-align: center; }
  .text-secondary { color: var(--text-secondary); }
  .text-danger { color: var(--danger); }
  .flex-between { display: flex; justify-content: space-between; align-items: center; }
  
  /* ============================================
     Scrollbar
     ============================================ */
  ::-webkit-scrollbar {
    width: 6px;
  }
  
  ::-webkit-scrollbar-track {
    background: transparent;
  }
  
  ::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
  }
  
  ::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
  }


/**
 * Design map grid — responsive 2-column layout.
 * Body diagram aspect-ratio is set by JS via image-utils.js
 * (never hardcode aspect-ratio here).
 */
.preview-design-map-grid {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 8px !important;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

@media print {
  .preview-design-map-grid {
    grid-template-columns: 1fr 1fr !important;
    max-width: 100%;
  }
}

  
  /* ============================================
     Responsive (Desktop only, but graceful)
     ============================================ */
  @media (max-width: 900px) {
    .main-layout {
      grid-template-columns: 1fr;
    }
    .preview-panel {
      display: none;
    }
  }

  /* ============================================
     Header Actions
     ============================================ */
  .header-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-left: auto;
    flex-shrink: 0;
  }

  /* ============================================
     Modal
     ============================================ */
  .modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
  }

  .modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 400px;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }

  .modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
  }

  .modal-header h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
  }

  .load-item:hover {
    background: var(--bg-hover);
  }

  /* ============================================
     Resize Handle
     ============================================ */
  .resize-handle:hover {
    background: var(--accent-hover, #2496c4) !important;
    transform: scale(1.3);
  }