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

body {
    font-family: 'JetBrains Mono', 'SF Mono', Monaco, 'Courier New', monospace;
    background: #f5f5f5;
    color: #1a1a1a;
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    margin-bottom: 24px;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 18px;
}

h1 {
    font-size: 26px;
    font-weight: 600;
    color: #F44336;
    margin-bottom: 5px;
}

.subtitle {
    font-size: 13px;
    color: #666;
}

/* Layout */
.builder-layout {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.builder-panel {
    flex: 1;
    min-width: 0;
}

.preview-panel {
    width: 340px;
    flex-shrink: 0;
    position: sticky;
    top: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Toolbar */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    background: #fff;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    padding: 12px 16px;
    margin-bottom: 14px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.toolbar-label {
    font-size: 12px;
    color: #888;
    font-weight: 500;
    margin-right: 4px;
}

.add-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 500;
    padding: 5px 12px;
    border-radius: 4px;
    border: 1px solid;
    cursor: pointer;
    transition: all 0.15s;
}

.add-text    { border-color: #94a3b8; color: #475569; background: #f8fafc; }
.add-text:hover    { background: #475569; color: #fff; }

.add-input   { border-color: #93c5fd; color: #2563eb; background: #eff6ff; }
.add-input:hover   { background: #2563eb; color: #fff; }

.add-calc    { border-color: #c4b5fd; color: #7c3aed; background: #f5f3ff; }
.add-calc:hover    { background: #7c3aed; color: #fff; }

.add-ref     { border-color: #6ee7b7; color: #047857; background: #ecfdf5; }
.add-ref:hover     { background: #047857; color: #fff; }

.add-newline { border-color: #d1d5db; color: #6b7280; background: #f9fafb; }
.add-newline:hover { background: #6b7280; color: #fff; }

/* Blocks Container */
.blocks-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 120px;
}

.empty-state {
    border: 2px dashed #d0d0d0;
    border-radius: 6px;
    padding: 40px 24px;
    text-align: center;
    color: #999;
}

.empty-title {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 10px;
    color: #777;
}

.empty-hint {
    font-size: 12px;
    line-height: 1.6;
    color: #999;
}

.empty-hint strong {
    color: #666;
}

/* Block Card */
.block {
    background: #fff;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    padding: 14px 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.block-type-badge {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 3px 9px;
    border-radius: 12px;
}

.badge-text    { background: #f1f5f9; color: #475569; border: 1px solid #cbd5e1; }
.badge-input   { background: #eff6ff; color: #2563eb; border: 1px solid #bfdbfe; }
.badge-calc    { background: #f5f3ff; color: #7c3aed; border: 1px solid #ddd6fe; }
.badge-ref     { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.badge-newline { background: #f9fafb; color: #6b7280; border: 1px solid #e5e7eb; }

.block-controls {
    display: flex;
    gap: 4px;
}

.block-controls button {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    width: 28px;
    height: 28px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    background: #fafafa;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.block-controls button:hover:not(:disabled) {
    border-color: #999;
    background: #f0f0f0;
}

.block-controls button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-delete:hover:not(:disabled) {
    border-color: #ef4444 !important;
    background: #fef2f2 !important;
    color: #ef4444;
}

/* Block Fields */
.block-fields {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.field-row {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.field-row-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.field-row label {
    font-size: 11px;
    color: #666;
    font-weight: 500;
}

.hint {
    font-size: 10px;
    color: #aaa;
    font-weight: 400;
}

.field-row input[type="text"],
.field-row input[type="number"],
.field-row select,
.field-row textarea {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    padding: 7px 10px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fff;
    color: #1a1a1a;
    transition: border-color 0.15s;
    width: 100%;
}

.field-row input:focus,
.field-row select:focus,
.field-row textarea:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 2px rgba(0,102,204,0.12);
}

.block-textarea {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    padding: 10px 12px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fafafa;
    color: #1a1a1a;
    width: 100%;
    min-height: 72px;
    resize: vertical;
    transition: border-color 0.15s;
    line-height: 1.5;
}

.block-textarea:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 2px rgba(0,102,204,0.12);
    background: #fff;
}

/* Variable chips */
.var-chips-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 2px;
}

.var-chips-row .hint {
    font-size: 11px;
    color: #999;
}

.var-chip {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    padding: 2px 8px;
    background: #f5f3ff;
    border: 1px solid #ddd6fe;
    border-radius: 10px;
    color: #7c3aed;
    cursor: pointer;
    transition: all 0.15s;
}

.var-chip:hover {
    background: #7c3aed;
    color: #fff;
    border-color: #7c3aed;
}

/* Block inline preview */
.block-output-preview {
    margin-top: 10px;
    padding: 7px 10px;
    background: #f8f8f8;
    border: 1px solid #e8e8e8;
    border-radius: 4px;
    font-size: 12px;
    color: #444;
    display: flex;
    align-items: center;
    gap: 6px;
}

.block-output-preview .arrow {
    color: #aaa;
    flex-shrink: 0;
}

.block-output-preview code {
    color: #7c3aed;
    word-break: break-all;
}

/* Newline visual */
.newline-visual {
    font-size: 12px;
    color: #9ca3af;
    padding: 4px 0;
    font-style: italic;
    display: flex;
    align-items: center;
    gap: 8px;
}

.newline-visual::before,
.newline-visual::after {
    content: '';
    flex: 1;
    height: 1px;
    background: #e5e7eb;
}

/* Preview Panel */
.preview-card,
.vars-card,
.ref-card {
    background: #fff;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid #e8e8e8;
    background: #fafafa;
}

.preview-title {
    font-size: 12px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.copy-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 500;
    padding: 4px 12px;
    border: 1px solid #c0c0c0;
    border-radius: 4px;
    background: #fff;
    color: #444;
    cursor: pointer;
    transition: all 0.15s;
}

.copy-btn:hover {
    border-color: #0066cc;
    color: #0066cc;
}

.copy-btn.copied {
    border-color: #16a34a;
    color: #16a34a;
    background: #f0fdf4;
}

.output-preview {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12.5px;
    padding: 14px;
    min-height: 120px;
    white-space: pre-wrap;
    word-break: break-all;
    color: #1a1a1a;
    line-height: 1.6;
    background: #fdfdfd;
}

.output-placeholder {
    color: #ccc;
    font-style: italic;
}

/* Variables card */
.vars-title,
.ref-title {
    font-size: 11px;
    font-weight: 600;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 8px 14px;
    border-bottom: 1px solid #f0f0f0;
    background: #fafafa;
}

.vars-list {
    padding: 10px 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.var-pill {
    font-size: 11px;
    padding: 3px 10px;
    background: #f5f3ff;
    border: 1px solid #ddd6fe;
    border-radius: 10px;
    color: #6d28d9;
    display: flex;
    gap: 6px;
    align-items: center;
    cursor: pointer;
    transition: filter 0.12s;
}
.var-pill:hover { filter: brightness(0.93); }

.var-pill-name {
    font-weight: 600;
}

.var-pill-label {
    color: #a78bfa;
    font-size: 10px;
}

/* Syntax reference */
.ref-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 11px;
    padding: 10px 14px;
    display: block;
}

.ref-table td {
    padding: 5px 14px;
    vertical-align: top;
    line-height: 1.4;
    border-bottom: 1px solid #f5f5f5;
    color: #555;
}

.ref-table tr:last-child td {
    border-bottom: none;
}

.ref-table td:first-child {
    white-space: nowrap;
    padding-right: 8px;
}

.ref-table code {
    font-size: 10.5px;
    color: #7c3aed;
    background: #f5f3ff;
    padding: 1px 4px;
    border-radius: 3px;
}

.ref-note {
    font-size: 11px;
    color: #999;
    padding: 8px 14px 12px;
    line-height: 1.5;
}

.ref-note code {
    font-size: 10.5px;
    color: #7c3aed;
    background: #f5f3ff;
    padding: 1px 4px;
    border-radius: 3px;
}

/* Block editor (contenteditable) */
.block-editor {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    padding: 10px 12px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fff;
    color: #1a1a1a;
    width: 100%;
    min-height: 72px;
    line-height: 2.2;
    word-break: break-word;
    white-space: pre-wrap;
    outline: none;
    cursor: text;
    transition: border-color 0.15s;
    position: relative;
}

.block-editor:focus {
    border-color: #0066cc;
    box-shadow: 0 0 0 2px rgba(0,102,204,0.12);
}

.block-editor.is-empty::before {
    content: attr(data-placeholder);
    color: #bbb;
    pointer-events: none;
    position: absolute;
    top: 10px;
    left: 12px;
    font-style: italic;
}

.ct-token {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 2px 10px;
    border-radius: 12px;
    border: 1px solid;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    line-height: 1.5;
    transition: all 0.12s;
    vertical-align: middle;
    margin: 0 2px;
    user-select: none;
}

.ct-input              { background: #eff6ff; border-color: #93c5fd; color: #1d4ed8; }
.ct-input:hover        { background: #2563eb; color: #fff; border-color: #2563eb; }

.ct-calc               { background: #f5f3ff; border-color: #c4b5fd; color: #6d28d9; }
.ct-calc:hover         { background: #7c3aed; color: #fff; border-color: #7c3aed; }

.ct-ref                { background: #ecfdf5; border-color: #6ee7b7; color: #065f46; }
.ct-ref:hover          { background: #047857; color: #fff; border-color: #047857; }

.ct-newline {
    display: inline-block;
    color: #d1d5db;
    font-size: 11px;
    vertical-align: middle;
    margin: 0 2px;
}

.ct-sub {
    font-size: 10px;
    opacity: 0.65;
    font-weight: 400;
}


/* Ref chip color variants matching var kind */
.ct-ref.ck-input     { background: #eff6ff; border-color: #93c5fd; color: #1d4ed8; }
.ct-ref.ck-input:hover { background: #2563eb; color: #fff; border-color: #2563eb; }
.ct-ref.ck-calc      { background: #f5f3ff; border-color: #c4b5fd; color: #6d28d9; }
.ct-ref.ck-calc:hover { background: #7c3aed; color: #fff; border-color: #7c3aed; }
.ct-ref.ck-checkbox  { background: #fffbeb; border-color: #fcd34d; color: #92400e; }
.ct-ref.ck-checkbox:hover { background: #d97706; color: #fff; border-color: #d97706; }
.ct-ref.ck-dropdown  { background: #ecfdf5; border-color: #6ee7b7; color: #065f46; }
.ct-ref.ck-dropdown:hover { background: #047857; color: #fff; border-color: #047857; }

/* Chip editing highlight */
.ct-token.editing {
    outline: 2px solid #2563eb;
    outline-offset: 1px;
}

/* Insert panel */
.insert-panel {
    margin-top: 8px;
    border: 1px solid #e8e8e8;
    border-radius: 5px;
    background: #fafafa;
    overflow: hidden;
}

.insert-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-bottom: 1px solid transparent;
}

.insert-row:has(+ .mini-form-wrap:not([style*="display:none"]):not(:empty)) {
    border-bottom-color: #e8e8e8;
}

.insert-chips {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 5px;
    flex: 1;
    min-width: 0;
    overflow-x: auto;
    /* hide scrollbar visually but keep functional */
    scrollbar-width: none;
}
.insert-chips::-webkit-scrollbar { display: none; }

.insert-label {
    font-size: 10px;
    color: #aaa;
    font-weight: 500;
    flex-shrink: 0;
}

.no-vars {
    font-size: 10px;
    color: #ccc;
    font-style: italic;
}

.insert-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    flex-shrink: 0;
}

.insert-action {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 500;
    padding: 3px 9px;
    border-radius: 4px;
    border: 1px solid;
    cursor: pointer;
    transition: all 0.15s;
    line-height: 1.4;
}

.ia-input    { border-color: #93c5fd; color: #2563eb; background: #eff6ff; }
.ia-input:hover,   .ia-input.active    { background: #2563eb; color: #fff; border-color: #2563eb; }

.ia-calc     { border-color: #c4b5fd; color: #7c3aed; background: #f5f3ff; }
.ia-calc:hover,    .ia-calc.active     { background: #7c3aed; color: #fff; border-color: #7c3aed; }

.ia-checkbox { border-color: #fcd34d; color: #92400e; background: #fffbeb; }
.ia-checkbox:hover, .ia-checkbox.active { background: #d97706; color: #fff; border-color: #d97706; }

.ia-dropdown { border-color: #6ee7b7; color: #047857; background: #ecfdf5; }
.ia-dropdown:hover, .ia-dropdown.active { background: #047857; color: #fff; border-color: #047857; }

/* Mini-form wrapper */
.mini-form-wrap {
    padding: 10px 12px 12px;
    background: #f5f5f5;
    border-top: 1px solid #e8e8e8;
}

.mini-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mini-form-title {
    font-size: 11px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mf-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.mf-field {
    display: flex;
    flex-direction: column;
    gap: 3px;
    flex: 1;
    min-width: 120px;
}

.mf-field-wide {
    flex: 2;
    min-width: 180px;
}

.mf-field-full {
    flex: 100;
    min-width: 100%;
}

.mf-field label {
    font-size: 10px;
    color: #888;
    font-weight: 500;
}

.mf-field input[type="text"],
.mf-field select {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 5px 8px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fff;
    color: #1a1a1a;
    width: 100%;
    transition: border-color 0.15s;
}

.mf-field input:focus,
.mf-field select:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 2px rgba(0,102,204,0.1);
}

.mf-actions {
    display: flex;
    gap: 6px;
    align-items: center;
    margin-top: 2px;
}

/* Inline "Define new variable" row inside calc form */
.mf-new-var {
    margin-top: 8px;
    padding: 8px 10px;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 4px;
}

.mf-new-var-label {
    font-size: 10px;
    font-weight: 600;
    color: #166534;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}

.mf-new-var-row {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.mf-new-var-row input {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 4px 8px;
    border: 1px solid #86efac;
    border-radius: 4px;
    background: #fff;
    color: #1a1a1a;
    flex: 1;
    min-width: 80px;
}

.mf-new-var-row input:focus {
    outline: none;
    border-color: #16a34a;
    box-shadow: 0 0 0 2px rgba(22,163,74,0.12);
}

.mf-nv-add {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border: 1px solid #16a34a;
    border-radius: 4px;
    background: #16a34a;
    color: #fff;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}

.mf-nv-add:hover { background: #15803d; border-color: #15803d; }

.mf-insert-btn, .mf-add-var-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 500;
    padding: 5px 14px;
    border: 1px solid #16a34a;
    border-radius: 4px;
    background: #f0fdf4;
    color: #16a34a;
    cursor: pointer;
    transition: all 0.15s;
}

.mf-insert-btn:hover, .mf-add-var-btn:hover {
    background: #16a34a;
    color: #fff;
}

.mf-cancel-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 5px 10px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    background: #fff;
    color: #888;
    cursor: pointer;
    transition: all 0.15s;
}

.mf-cancel-btn:hover {
    border-color: #aaa;
    color: #555;
}

/* Expression editor (contenteditable in calc form) */
.mf-expr-editor {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 5px 8px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fff;
    color: #1a1a1a;
    width: 100%;
    min-height: 30px;
    line-height: 2;
    word-break: break-word;
    white-space: pre-wrap;
    outline: none;
    cursor: text;
    transition: border-color 0.15s;
    position: relative;
}

.mf-expr-editor:focus {
    border-color: #0066cc;
    box-shadow: 0 0 0 2px rgba(0,102,204,0.1);
}

.mf-expr-editor.is-empty::before {
    content: attr(data-placeholder);
    color: #bbb;
    pointer-events: none;
    font-style: italic;
}

/* Inline variable chips inside expression editor */
.expr-var-chip {
    display: inline-flex;
    align-items: center;
    padding: 1px 7px;
    border-radius: 9px;
    border: 1px solid #93c5fd;
    background: #eff6ff;
    color: #1d4ed8;
    font-size: 11px;
    font-weight: 500;
    cursor: default;
    user-select: none;
    vertical-align: middle;
    margin: 0 1px;
}

.expr-var-chip[data-kind="calc"] {
    border-color: #c4b5fd;
    background: #f5f3ff;
    color: #6d28d9;
}

.expr-var-chip[data-kind="checkbox"] {
    border-color: #fcd34d;
    background: #fffbeb;
    color: #92400e;
}

.expr-var-chip[data-kind="dropdown"] {
    border-color: #6ee7b7;
    background: #ecfdf5;
    color: #065f46;
}

/* Result row: input + save button */
.mf-result-row {
    display: flex;
    gap: 5px;
    align-items: center;
}

.mf-result-row input {
    flex: 1;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 5px 8px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fff;
    color: #1a1a1a;
    min-width: 0;
    transition: border-color 0.15s;
}

.mf-result-row input:focus {
    outline: none;
    border-color: #7c3aed;
    box-shadow: 0 0 0 2px rgba(124,58,237,0.1);
}

.mf-result-save {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    font-weight: 600;
    width: 28px;
    height: 28px;
    border: 1px solid #c4b5fd;
    border-radius: 4px;
    background: #f5f3ff;
    color: #7c3aed;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.15s;
    padding: 0;
}

.mf-result-save:hover {
    background: #7c3aed;
    border-color: #7c3aed;
    color: #fff;
}

/* Variable chip color variants (inside insert panel) */
.var-chip.var-kind-input {
    background: #eff6ff;
    border-color: #93c5fd;
    color: #1d4ed8;
}
.var-chip.var-kind-input:hover {
    background: #2563eb;
    border-color: #2563eb;
    color: #fff;
}

.var-chip.var-kind-calc {
    background: #f5f3ff;
    border-color: #c4b5fd;
    color: #6d28d9;
}
.var-chip.var-kind-calc:hover {
    background: #7c3aed;
    border-color: #7c3aed;
    color: #fff;
}

.var-chip.var-kind-checkbox {
    background: #fffbeb;
    border-color: #fcd34d;
    color: #92400e;
}
.var-chip.var-kind-checkbox:hover {
    background: #d97706;
    border-color: #d97706;
    color: #fff;
}

.var-chip.var-kind-dropdown {
    background: #ecfdf5;
    border-color: #6ee7b7;
    color: #065f46;
}
.var-chip.var-kind-dropdown:hover {
    background: #047857;
    border-color: #047857;
    color: #fff;
}

/* Variable pill color variants (right-panel vars card) */
.var-pill.vp-input {
    background: #eff6ff;
    border-color: #93c5fd;
    color: #1d4ed8;
}
.var-pill.vp-input .var-pill-label { color: #60a5fa; }

.var-pill.vp-calc {
    background: #f5f3ff;
    border-color: #c4b5fd;
    color: #6d28d9;
}
.var-pill.vp-calc .var-pill-label { color: #a78bfa; }

.var-pill.vp-checkbox {
    background: #fffbeb;
    border-color: #fcd34d;
    color: #92400e;
}
.var-pill.vp-checkbox .var-pill-label { color: #d97706; }

.var-pill.vp-dropdown {
    background: #ecfdf5;
    border-color: #6ee7b7;
    color: #065f46;
}
.var-pill.vp-dropdown .var-pill-label { color: #059669; }

/* Brief flash when var is saved */
@keyframes field-saved-flash {
    0%   { background: #bbf7d0; border-color: #22c55e; }
    100% { background: #fff; border-color: #d0d0d0; }
}

.field-saved {
    animation: field-saved-flash 0.8s ease-out forwards;
}

/* ─── Preview Toggle Button ─────────────────────────────────────────────────── */
.preview-toggle-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 4px;
    border: 1px solid #F44336;
    background: #fff;
    color: #F44336;
    cursor: pointer;
    transition: all 0.15s;
    margin-left: auto;
}
.preview-toggle-btn:hover,
.preview-toggle-btn.preview-active {
    background: #F44336;
    color: #fff;
}

/* ─── Preview Mode Layout ────────────────────────────────────────────────────── */
.preview-section {
    margin-bottom: 24px;
}

.preview-layout {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

/* Form panel */
.pf-panel {
    flex: 1;
    min-width: 0;
    background: #fff;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.pf-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    border-bottom: 1px solid #e8e8e8;
    background: #fafafa;
}

.pf-title {
    font-size: 12px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pf-back-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    padding: 4px 10px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fff;
    color: #666;
    cursor: pointer;
    transition: all 0.15s;
}
.pf-back-btn:hover { border-color: #999; color: #333; }

.pf-fields {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pf-empty {
    font-size: 13px;
    color: #aaa;
    font-style: italic;
    text-align: center;
    padding: 20px 0;
}

.pf-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.pf-label {
    font-size: 12px;
    font-weight: 600;
    color: #444;
}

.pf-input,
.pf-select {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    padding: 8px 10px;
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    background: #fff;
    color: #1a1a1a;
    transition: border-color 0.15s;
    width: 100%;
}
.pf-input:focus, .pf-select:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 2px rgba(0,102,204,0.12);
}

.pf-field-check { flex-direction: column; gap: 4px; }
.pf-check-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.pf-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
    flex-shrink: 0;
}
.pf-check-text { font-size: 13px; color: #1a1a1a; }
.pf-check-hint { font-size: 10px; color: #aaa; margin-left: 24px; }

.pf-section-sep {
    height: 1px;
    background: #f0f0f0;
    margin: 4px 0;
}
.pf-section-label {
    font-size: 10px;
    font-weight: 600;
    color: #aaa;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.pf-calc-result {}
.pf-result {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    font-weight: 600;
    padding: 8px 10px;
    background: #f5f3ff;
    border: 1px solid #ddd6fe;
    border-radius: 4px;
    color: #6d28d9;
    min-height: 36px;
}

/* Mobile "Calculate →" button — hidden on desktop */
.pf-submit-btn {
    display: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 600;
    width: calc(100% - 32px);
    margin: 0 16px 16px;
    padding: 10px;
    border: none;
    border-radius: 4px;
    background: #F44336;
    color: #fff;
    cursor: pointer;
    transition: background 0.15s;
}
.pf-submit-btn:hover { background: #d32f2f; }

/* Output panel */
.po-panel {
    width: 340px;
    flex-shrink: 0;
    background: #fff;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: sticky;
    top: 20px;
}

.po-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid #e8e8e8;
    background: #fafafa;
}

.po-title {
    font-size: 12px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.po-output {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12.5px;
    padding: 14px;
    min-height: 160px;
    white-space: pre-wrap;
    word-break: break-word;
    color: #1a1a1a;
    line-height: 1.7;
    background: #fdfdfd;
}

/* Mobile preview layout */
@media (max-width: 768px) {
    .preview-layout {
        flex-direction: column;
    }
    .po-panel {
        width: 100%;
        position: static;
        display: none; /* hidden until Calculate is tapped */
    }
    .po-panel.visible {
        display: block;
    }
    .pf-submit-btn {
        display: block; /* show Calculate button on mobile */
    }
}

/* Back link */
.back-link {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
}

.back-link a {
    color: #0066cc;
    text-decoration: none;
    font-size: 13px;
}

.back-link a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 960px) {
    .builder-layout {
        flex-direction: column;
    }
    .preview-panel {
        width: 100%;
        position: static;
    }
}

@media (max-width: 600px) {
    body { padding: 12px; }
    h1 { font-size: 20px; }
    .toolbar { gap: 6px; }
    .add-btn { font-size: 11px; padding: 4px 8px; }
    .field-row-2col { grid-template-columns: 1fr; }
}