.decomposition-tool {
    max-width: 1320px;
    margin: 0 auto;
    padding: 16px 18px 38px;
    text-align: left;
}

.decomposition-tool p {
    padding-inline: 0;
    letter-spacing: 0;
}

.tool-hero {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    margin-bottom: 14px;
    font-size: 1rem;
    text-align: left;
}

.tool-hero h1 {
    margin: 0 0 6px;
    color: var(--tool-text);
    font-size: clamp(1.65rem, 2.8vw, 2.35rem);
    line-height: 1.12;
}

.tool-hero p {
    max-width: 680px;
    margin: 0;
    color: var(--tool-text-muted);
    line-height: 1.45;
}

.related-link {
    flex: 0 0 auto;
    padding: 8px 12px;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius-md);
    background: var(--tool-surface-raised);
    color: var(--tool-text);
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
}

.mode-tabs {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius-md);
    background: var(--tool-surface-raised);
    padding: 8px;
}

.tool-math .mode-tab {
    display: grid;
    gap: 2px;
    width: 100%;
    min-height: 0;
    padding: 10px 12px !important;
    text-align: left;
    color: var(--tool-text) !important;
    background: transparent !important;
    border-color: var(--tool-border) !important;
}

.tool-math .mode-tab:hover {
    transform: none;
}

.tool-math .mode-tab strong,
.tool-math .mode-tab span {
    display: block;
}

.tool-math .mode-tab strong {
    color: inherit;
    font-size: 0.95rem;
    line-height: 1.15;
}

.tool-math .mode-tab span {
    color: var(--tool-text-muted);
    font-size: 0.78rem;
    font-weight: 700;
    line-height: 1.25;
}

.mode-tab.active {
    color: #fff !important;
    background: var(--tool-primary) !important;
    border-color: var(--tool-primary) !important;
}

.mode-tab.active span {
    color: rgba(255, 255, 255, 0.82);
}

.lab-layout {
    display: grid;
    grid-template-columns: minmax(320px, 380px) minmax(0, 1fr);
    gap: 14px;
    align-items: start;
}

.side-rail {
    display: grid;
    gap: 12px;
    min-width: 0;
}

.panel,
.concept-grid article {
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius-md);
    background: var(--tool-surface);
    box-shadow: var(--tool-shadow-sm);
}

.panel {
    padding: 14px;
}

.visual-panel {
    min-width: 0;
}

.panel-header {
    display: grid;
    gap: 4px;
    margin-bottom: 12px;
}

.panel-header h2 {
    margin: 0;
    color: var(--tool-text);
    font-size: 1rem;
}

.panel-header p {
    margin: 0;
    color: var(--tool-text-muted);
    font-size: 0.86rem;
    line-height: 1.4;
}

.matrix-editor {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    max-width: 260px;
    margin: 0 auto;
}

.matrix-cell-label {
    display: grid;
    gap: 4px;
    color: var(--tool-text-muted);
    font-size: 0.78rem;
    font-weight: 800;
}

.matrix-cell-label input {
    box-sizing: border-box;
    width: 100%;
    min-width: 0;
    min-height: 48px;
    text-align: center;
    color: var(--tool-text);
    background: var(--tool-surface-raised);
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius-md);
    font-size: 1rem;
    font-weight: 800;
}

.dataset-editor {
    display: grid;
    gap: 8px;
}

.dataset-editor label {
    color: var(--tool-text);
    font-weight: 800;
}

.dataset-editor textarea {
    min-height: 152px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    line-height: 1.45;
}

.is-hidden {
    display: none !important;
}

.preset-bar,
.actions-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.preset-bar {
    margin-top: 12px;
}

.actions-row {
    margin-top: 10px;
}

.decomposition-tool button {
    min-height: 38px;
    padding: 0.55rem 0.85rem;
    border-radius: var(--tool-radius-md);
}

.primary-button {
    background: var(--tool-primary) !important;
    border-color: var(--tool-primary) !important;
    color: #fff !important;
}

.secondary-button,
.ghost-button {
    color: var(--tool-text) !important;
    background: var(--tool-surface-raised) !important;
    border-color: var(--tool-border) !important;
}

.ghost-button {
    color: var(--tool-text-muted) !important;
}

.status-message {
    min-height: 1.35em;
    margin: 10px 0 0;
    color: var(--tool-text-muted);
    font-size: 0.86rem;
}

.status-message.is-error {
    color: var(--tool-danger);
    font-weight: 800;
}

.status-message.is-success {
    color: var(--tool-success);
    font-weight: 800;
}

#decomposition-canvas {
    display: block;
    width: 100%;
    max-width: 860px;
    height: auto;
    aspect-ratio: 16 / 10;
    margin: 0 auto;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius-md);
    background: var(--tool-surface-raised);
}

.legend-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 12px;
    margin-top: 12px;
    color: var(--tool-text-muted);
    font-size: 0.84rem;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.legend-swatch {
    width: 16px;
    height: 4px;
    border-radius: 999px;
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.result-card {
    padding: 12px;
    border: 1px solid var(--tool-border);
    border-radius: var(--tool-radius-md);
    background: var(--tool-surface-raised);
    min-width: 0;
}

.result-card h3 {
    margin: 0 0 8px;
    color: var(--tool-text);
    font-size: 0.9rem;
}

.result-card pre,
.result-card p {
    margin: 0;
    color: var(--tool-text-muted);
    line-height: 1.55;
}

.result-card pre {
    overflow-x: auto;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.82rem;
    white-space: pre-wrap;
}

.metric-list {
    display: grid;
    gap: 6px;
}

.metric-list div {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    border-bottom: 1px solid var(--tool-border);
    padding-bottom: 6px;
    color: var(--tool-text-muted);
}

.metric-list strong {
    color: var(--tool-text);
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
}

.concept-grid article {
    padding: 14px;
}

.concept-grid h2 {
    margin: 0 0 6px;
    color: var(--tool-text);
    font-size: 0.95rem;
}

.concept-grid p {
    margin: 0;
    color: var(--tool-text-muted);
    font-size: 0.88rem;
    line-height: 1.45;
}

@media (max-width: 980px) {
    .lab-layout,
    .concept-grid {
        grid-template-columns: 1fr;
    }

    .tool-hero {
        display: grid;
        align-items: start;
    }

    .side-rail {
        grid-template-columns: minmax(260px, 0.85fr) minmax(280px, 1fr);
        align-items: start;
    }

    .mode-tabs {
        grid-column: 1 / -1;
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    #decomposition-canvas {
        max-width: 100%;
    }
}

@media (max-width: 560px) {
    .decomposition-tool {
        padding-inline: 12px;
    }

    .side-rail,
    .mode-tabs,
    .preset-bar,
    .actions-row {
        display: grid;
        grid-template-columns: 1fr;
        width: 100%;
    }

    .mode-tabs {
        grid-column: auto;
    }

    .mode-tab,
    .decomposition-tool button {
        width: 100%;
    }

    .related-link {
        width: fit-content;
    }

    .matrix-editor {
        max-width: none;
    }
}