.vf-root {
        --vf-bg: #f9fafb;
        --vf-card: #fff;
        --vf-border: #e5e7eb;
        --vf-primary: #f40;
        --vf-secondary: #06c;
        --vf-accent: #0c9;
        --vf-text: #111827;
        --vf-text-muted: #6b7280;
        --vf-success: #0c9;

        display: flex;
        flex-direction: column;
        gap: 0;
        padding: 0;
        max-width: 1000px;
        margin: 2rem auto;
        background: var(--vf-bg);
        border: 1px solid var(--vf-border);
        border-radius: 12px;
        overflow: hidden;
        color: var(--vf-text);
    }

    .theme-dark .vf-root {
        --vf-bg: #111112;
        --vf-card: #1a1a1b;
        --vf-border: #333335;
        --vf-primary: #f40;
        --vf-secondary: #00d4ff;
        --vf-accent: #0fc;
        --vf-text: #fff;
        --vf-text-muted: #88888b;
    }

    .vf-tool-header {
        background: var(--vf-card);
        padding: 2rem;
        border-bottom: 1px solid var(--vf-border);
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .vf-tool-header h2 {
        margin: 0;
        font-size: 1.5rem;
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: 0.1em;
    }

    .vf-main-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0;
    }

    @media (max-width: 800px) {
        .vf-main-container {
            grid-template-columns: 1fr;
        }
    }

    .vf-sidebar {
        padding: 2rem;
        border-right: 1px solid var(--vf-border);
        background: var(--vf-bg);
    }

    .theme-dark .vf-sidebar {
        border-right-color: var(--vf-border);
    }

    .vf-content-area {
        padding: 2rem;
        background: var(--vf-card);
        display: flex;
        flex-direction: column;
        gap: 2rem;
    }

    .vf-subsection {
        margin-bottom: 2.5rem;
    }

    .vf-subsection-title {
        font-size: 0.75rem;
        font-weight: 800;
        color: var(--vf-text-muted);
        text-transform: uppercase;
        letter-spacing: 0.2em;
        margin-bottom: 1.5rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .vf-control-item {
        margin-bottom: 1.5rem;
    }

    .vf-control-label-row {
        display: flex;
        justify-content: space-between;
        margin-bottom: 0.8rem;
    }

    .vf-control-label-row label {
        font-size: 0.9rem;
        font-weight: 600;
        color: var(--vf-text);
    }

    .vf-control-value {
        font-weight: 700;
        color: var(--vf-secondary);
        font-size: 1rem;
    }

    .vf-flat-range {
        -webkit-appearance: none;
        appearance: none;
        width: 100%;
        height: 4px;
        background: var(--vf-border);
        outline: none;
        border-radius: 2px;
    }

    .vf-flat-range::-webkit-slider-thumb {
        -webkit-appearance: none;
        width: 20px;
        height: 20px;
        background: var(--vf-text);
        border: 3px solid var(--vf-primary);
        border-radius: 0;
        cursor: pointer;
    }

    .vf-flat-range::-moz-range-thumb {
        width: 20px;
        height: 20px;
        background: var(--vf-text);
        border: 3px solid var(--vf-primary);
        border-radius: 0;
        cursor: pointer;
    }

    .vf-preset-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .vf-flat-button {
        background: var(--vf-bg);
        border: 1px solid var(--vf-border);
        color: var(--vf-text);
        padding: 0.8rem;
        font-size: 0.8rem;
        font-weight: 700;
        text-align: left;
        cursor: pointer;
        transition: all 0.1s;
    }

    .vf-flat-button:hover {
        border-color: var(--vf-text-muted);
    }

    .vf-flat-button.vf-active {
        background: var(--vf-primary);
        border-color: var(--vf-primary);
        color: white;
    }

    .vf-hero-display {
        padding: 2rem;
        background: var(--vf-bg);
        border: 1px solid var(--vf-border);
        text-align: center;
        position: relative;
        transition: all 0.2s;
    }

    .vf-hero-label {
        font-size: 0.7rem;
        font-weight: 800;
        color: var(--vf-text-muted);
        text-transform: uppercase;
        letter-spacing: 0.2em;
    }

    .vf-hero-value {
        font-size: 4rem;
        font-weight: 900;
        margin: 0.5rem 0;
        color: var(--vf-text);
    }

    .vf-hero-unit {
        font-size: 0.9rem;
        font-weight: 700;
        opacity: 0.5;
    }

    .vf-limit-indicator {
        height: 4px;
        background: var(--vf-border);
        margin-top: 1.5rem;
        overflow: hidden;
    }

    .vf-limit-fill {
        height: 100%;
        width: 0;
        background: var(--vf-accent);
        transition: width 0.3s ease;
    }

    .vf-stats-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }

    .vf-stat-box {
        padding: 1rem;
        background: var(--vf-bg);
        border: 1px solid var(--vf-border);
        transition: all 0.2s;
    }

    .vf-stat-label-box {
        font-size: 0.65rem;
        color: var(--vf-text-muted);
        text-transform: uppercase;
        margin-bottom: 0.3rem;
    }

    .vf-stat-value-box {
        font-size: 1.2rem;
        font-weight: 800;
    }

    .vf-chart-area-flat {
        height: 200px;
        border: 1px solid var(--vf-border);
        background: var(--vf-bg);
        position: relative;
        padding: 1rem;
        transition: all 0.2s;
    }

    .vf-copy-action {
        background: var(--vf-primary);
        color: white;
        border: none;
        padding: 1.2rem;
        font-weight: 800;
        font-size: 1rem;
        text-transform: uppercase;
        letter-spacing: 0.1em;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 1rem;
        transition: background 0.2s;
    }

    .vf-copy-action:hover {
        background: #f52;
    }

    .vf-toggle-simple {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        cursor: pointer;
        font-size: 0.75rem;
        font-weight: 700;
        color: var(--vf-text-muted);
    }

    .vf-toggle-simple.vf-active {
        color: var(--vf-secondary);
    }

    .vf-toggle-box {
        width: 32px;
        height: 16px;
        background: var(--vf-border);
        position: relative;
    }

    .vf-toggle-knob {
        width: 12px;
        height: 12px;
        background: var(--vf-text);
        position: absolute;
        top: 2px;
        left: 2px;
        transition: transform 0.2s;
    }

    .vf-toggle-simple.vf-active .vf-toggle-knob {
        transform: translateX(16px);
        background: var(--vf-secondary);
    }

    .vf-material-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0.4rem;
        margin-top: 1rem;
    }

    .vf-chip-select {
        background: var(--vf-bg);
        border: 1px solid var(--vf-border);
        color: var(--vf-text-muted);
        padding: 0.6rem;
        font-size: 0.75rem;
        font-weight: 700;
        cursor: pointer;
        text-align: center;
        transition: all 0.1s;
    }

    .vf-chip-select:hover {
        border-color: var(--vf-text-muted);
    }

    .vf-chip-select.vf-active {
        border-color: var(--vf-secondary);
        color: var(--vf-secondary);
        background: rgba(0, 212, 255, 0.05);
    }

    .vf-reset-row {
        margin-top: 1rem;
        display: flex;
        justify-content: flex-end;
    }

    .vf-btn-outline {
        background: transparent;
        border: 1px solid var(--vf-border);
        color: var(--vf-text-muted);
        padding: 0.4rem 0.8rem;
        font-size: 0.65rem;
        font-weight: 800;
        cursor: pointer;
        text-transform: uppercase;
        letter-spacing: 0.1em;
        transition: all 0.1s;
    }

    .vf-btn-outline:hover {
        border-color: var(--vf-text);
        color: var(--vf-text);
    }

    .vf-tooltip-trigger {
        cursor: help;
        color: var(--vf-text-muted);
        margin-left: 0.4rem;
        display: inline-flex;
        align-items: center;
    }

    [data-tooltip] {
        position: relative;
    }

    [data-tooltip]::after {
        content: attr(data-tooltip);
        position: absolute;
        bottom: 150%;
        left: 50%;
        transform: translateX(-50%) translateY(10px);
        background: var(--vf-text);
        color: var(--vf-bg);
        padding: 0.6rem 1rem;
        border-radius: 4px;
        font-size: 0.75rem;
        font-weight: 600;
        line-height: 1.4;
        width: 220px;
        white-space: normal;
        text-align: center;
        visibility: hidden;
        opacity: 0;
        transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        z-index: 1000;
    }

    [data-tooltip]:hover::after {
        visibility: visible;
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }

    .vf-danger-state {
        animation: vf-danger-pulse 1s infinite alternate;
        border-color: var(--vf-primary);
    }

    .vf-danger-text {
        color: var(--vf-primary);
    }

    @keyframes vf-danger-pulse {
        from {
            box-shadow: 0 0 0 0 rgba(255, 68, 0, 0);
        }

        to {
            box-shadow: 0 0 0 4px rgba(255, 68, 0, 0.2);
        }
    }

    .vf-axis-label {
        font-size: 9px;
        font-weight: 800;
        fill: var(--vf-text-muted);
        text-transform: uppercase;
    }