.mml-tool-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    min-height: 520px;
}

.mml-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-muted, #f9fafb);
}

.mml-toolbar-left { display: flex; align-items: center; gap: 8px; }

.mml-title {
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.mml-title i { color: #6366f1; }

.mml-badge {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 10px;
    background: rgba(99, 102, 241, 0.1);
    color: #6366f1;
}

.mml-toolbar-right { display: flex; gap: 6px; }

.mml-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    font-size: 0.78rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    cursor: pointer;
}

.mml-btn-primary {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    border-color: transparent;
    color: #fff !important;
}

.mml-canvas-wrap {
    padding: 24px;
    overflow: auto;
    background: #f8fafc;
}

.mml-board {
    position: relative;
    max-width: 960px;
    margin: 0 auto;
    min-height: 460px;
}

.mml-lines {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.mml-root-wrap,
.mml-level {
    position: relative;
    z-index: 1;
}

.mml-root-wrap {
    display: flex;
    justify-content: center;
    margin-bottom: 28px;
}

.mml-level-1 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.mml-branch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.mml-children {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

.mml-node {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    line-height: 1.45;
    text-align: center;
    border: 2px solid transparent;
    transition: box-shadow 0.15s;
}

.mml-node:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.mml-node-root {
    max-width: 420px;
    font-weight: 700;
    font-size: 0.95rem;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff;
    border-color: #4f46e5;
}

.mml-node-l1 {
    width: 100%;
    font-weight: 600;
    background: #eef2ff;
    color: #3730a3;
    border-color: #c7d2fe;
}

.mml-node-l2 {
    width: 100%;
    background: #fff;
    color: var(--text-secondary);
    border-color: #e2e8f0;
    font-size: 0.78rem;
    text-align: left;
}
@media (max-width: 768px) {
    .mml-level-1 { grid-template-columns: 1fr; }
}