.ctg-section {
    --tool-accent: #8B5CF6;
    --tool-accent-rgb: 139, 92, 246;
}

/* ── Layout ──────────────────────────────────────────────────────────────── */
.ctg-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.ctg-controls {
    padding: 20px 0 20px 24px;
    min-width: 0;
}

.ctg-output-col {
    padding: 20px 24px 20px 0;
    min-width: 0;
}

/* ── Presets bar ─────────────────────────────────────────────────────────── */
.ctg-presets-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 20px 24px 20px;
    border-bottom: 1px solid var(--tool-border);
    flex-wrap: wrap;
}

.ctg-presets-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--tool-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    flex-shrink: 0;
}

.ctg-presets-list {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.ctg-preset-btn {
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--tool-border);
    background: var(--tool-surface);
    color: var(--tool-text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}

.ctg-preset-btn:hover {
    border-color: var(--tool-accent);
    color: var(--tool-accent);
    background: rgba(var(--tool-accent-rgb), 0.07);
}

.ctg-preset-btn--active {
    background: var(--tool-accent);
    border-color: var(--tool-accent);
    color: #fff;
}

.ctg-preset-btn--active:hover {
    background: rgba(var(--tool-accent-rgb), 0.82);
    border-color: rgba(var(--tool-accent-rgb), 0.82);
    color: #fff;
}

/* ── Groups ──────────────────────────────────────────────────────────────── */
.ctg-group {
    margin-bottom: 1.25rem;
}

.ctg-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.ctg-group-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--tool-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.5rem;
}

.ctg-group-header .ctg-group-label {
    margin-bottom: 0;
}

/* ── Scale lock toggle ───────────────────────────────────────────────────── */
.ctg-lock-label {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--tool-text-muted);
    user-select: none;
    transition: color 0.15s;
}

.ctg-lock-label input[type="checkbox"] {
    display: none;
}

.ctg-lock-label i {
    font-size: 0.875rem;
    transition: opacity 0.15s;
}

.ctg-lock-icon-on {
    display: none;
}

.ctg-lock-label input:checked~.ctg-lock-icon-off {
    display: none;
}

.ctg-lock-label input:checked~.ctg-lock-icon-on {
    display: inline;
    color: var(--tool-accent);
}

.ctg-lock-label:has(input:checked) {
    color: var(--tool-accent);
}

/* ── 3D mode toggle ──────────────────────────────────────────────────────── */
.ctg-3d-toggle-wrap {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    user-select: none;
}

.ctg-3d-toggle-wrap input[type="checkbox"] {
    display: none;
}

.ctg-3d-track {
    position: relative;
    width: 30px;
    height: 17px;
    border-radius: 999px;
    background: var(--tool-border);
    transition: background 0.2s;
    flex-shrink: 0;
}

.ctg-3d-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s;
}

.ctg-3d-toggle-wrap input:checked~.ctg-3d-track {
    background: var(--tool-accent);
}

.ctg-3d-toggle-wrap input:checked~.ctg-3d-track .ctg-3d-thumb {
    transform: translateX(13px);
}

.ctg-3d-text {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--tool-text-muted);
    transition: color 0.15s;
}

.ctg-3d-toggle-wrap:has(input:checked) .ctg-3d-text {
    color: var(--tool-accent);
}

/* ── 3D panel ────────────────────────────────────────────────────────────── */
.ctg-3d-panel {
    display: none;
    margin-top: 0.6rem;
    padding: 0.75rem 0.875rem;
    border: 1px solid rgba(var(--tool-accent-rgb), 0.25);
    border-radius: var(--tool-radius-sm, 6px);
    background: rgba(var(--tool-accent-rgb), 0.04);
}

.ctg-3d-panel--visible {
    display: block;
}

/* ── Unit select ─────────────────────────────────────────────────────────── */
.ctg-unit-select {
    font-size: 0.8125rem !important;
    padding: 0.2rem 0.45rem !important;
    height: auto !important;
    min-height: unset !important;
    border-radius: 5px !important;
    cursor: pointer;
}

/* ── Slider rows ─────────────────────────────────────────────────────────── */
.ctg-slider-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.45rem;
}

.ctg-prop-label {
    font-size: 0.875rem;
    color: var(--tool-text-secondary);
    min-width: 84px;
    flex-shrink: 0;
}

.ctg-val {
    font-size: 0.9375rem;
    font-family: var(--tool-font-mono);
    color: var(--tool-accent);
    font-weight: 600;
    min-width: 56px;
    text-align: right;
}

/* ── Origin grid ─────────────────────────────────────────────────────────── */
.ctg-origin-grid {
    display: grid;
    grid-template-columns: repeat(3, 32px);
    gap: 4px;
    margin-bottom: 0.4rem;
}

.ctg-origin-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--tool-border);
    border-radius: 4px;
    background: var(--tool-surface);
    color: var(--tool-text-secondary);
    cursor: pointer;
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.12s;
    padding: 0;
}

.ctg-origin-btn:hover {
    background: rgba(var(--tool-accent-rgb), 0.12);
    border-color: var(--tool-accent);
}

.ctg-origin-btn--active {
    background: var(--tool-accent);
    border-color: var(--tool-accent);
    color: #fff;
}

.ctg-origin-val {
    font-size: 0.875rem;
    font-family: var(--tool-font-mono);
    color: var(--tool-text-muted);
}

/* ── Preview bar ─────────────────────────────────────────────────────────── */
.ctg-preview-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.ctg-shape-tabs {
    display: flex;
    gap: 0.25rem;
}

.ctg-shape-tab {
    padding: 0.25rem 0.65rem;
    border-radius: 6px;
    border: 1px solid var(--tool-border);
    background: var(--tool-surface);
    color: var(--tool-text-muted);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.13s;
}

.ctg-shape-tab:hover {
    color: var(--tool-accent);
    border-color: var(--tool-accent);
}

.ctg-shape-tab--active {
    background: var(--tool-accent);
    border-color: var(--tool-accent);
    color: #fff;
}

.ctg-shape-tab--active:hover {
    background: rgba(var(--tool-accent-rgb), 0.82);
    border-color: rgba(var(--tool-accent-rgb), 0.82);
    color: #fff;
}

.ctg-bg-toggle {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 1px solid var(--tool-border);
    background: var(--tool-surface);
    color: var(--tool-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.13s;
}

.ctg-bg-toggle:hover {
    border-color: var(--tool-accent);
    color: var(--tool-accent);
}

/* ── Preview canvas ──────────────────────────────────────────────────────── */
.ctg-preview-canvas {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius-md);
    background: #f1f5f9;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: background 0.2s, border-color 0.2s;
}

.ctg-preview-canvas--dark {
    background: #0f172a;
    border-color: #1e293b;
}

/* ── Preview shape ───────────────────────────────────────────────────────── */
.ctg-preview-shape {
    width: 96px;
    height: 96px;
    background: var(--tool-accent);
    border-radius: 10px;
    transition: transform 0.08s linear, transform-origin 0.08s;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.ctg-preview-shape--circle {
    border-radius: 50%;
}

.ctg-preview-shape--text {
    background: transparent;
    width: auto;
    height: auto;
    border-radius: 0;
    overflow: visible;
}

.ctg-preview-shape--image {
    border-radius: 10px;
    background: linear-gradient(135deg,
            rgba(var(--tool-accent-rgb), 0.15) 0%,
            rgba(var(--tool-accent-rgb), 0.5) 100%);
    border: 2px dashed rgba(var(--tool-accent-rgb), 0.4);
}

/* shape inner content: hide by default */
.ctg-text-content,
.ctg-image-content {
    display: none;
}

.ctg-preview-shape--text .ctg-text-content {
    display: inline;
    font-size: 2.75rem;
    font-weight: 900;
    color: var(--tool-accent);
    line-height: 1;
    font-family: var(--tool-font-mono, monospace);
}

.ctg-preview-shape--image .ctg-image-content {
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(var(--tool-accent-rgb), 0.6);
    font-size: 2rem;
}

/* ── Prefix toggle ───────────────────────────────────────────────────────── */
.ctg-prefix-label {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    font-size: 0.8125rem;
    color: var(--tool-text-muted);
    user-select: none;
    font-weight: 500;
}

.ctg-prefix-label input[type="checkbox"] {
    accent-color: var(--tool-accent);
    width: 13px;
    height: 13px;
    cursor: pointer;
}

/* ── Output textarea ─────────────────────────────────────────────────────── */
.ctg-output-ta {
    font-family: var(--tool-font-mono);
    font-size: 0.9rem;
    min-height: 130px;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .ctg-layout {
        grid-template-columns: 1fr;
    }

    .ctg-controls {
        padding: 20px 16px 0;
    }

    .ctg-output-col {
        padding: 0 16px 20px;
    }

    .ctg-presets-bar {
        padding: 16px 16px 16px;
    }

    .ctg-preview-canvas {
        min-height: 220px !important;
    }
}

@media (max-width: 540px) {
    .ctg-presets-bar {
        gap: 0.5rem;
    }

    .ctg-preset-btn {
        font-size: 0.75rem;
        padding: 0.2rem 0.6rem;
    }

    .ctg-shape-tab {
        font-size: 0.75rem;
        padding: 0.2rem 0.5rem;
    }

    .ctg-section .tool-io-header {
        flex-wrap: wrap;
        gap: 8px;
        row-gap: 8px;
    }

    .ctg-section .tool-io-actions {
        flex-wrap: wrap;
        width: 100%;
        justify-content: flex-end;
    }
}