/* Main Container (act as flex wrapper now) */
#prob-tree-app {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    font-family: 'Inter', sans-serif;
    /* Box styling removed as requested */
}

.pt-card {
    background: var(--mc-tool-surface);
    border: 1px solid var(--mc-tool-border);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.pt-header h3 {
    margin: 0 0 1rem 0;
    font-size: 1.25rem;
    color: var(--mc-tool-text);
}


/* Tree Editor Surface */
.tree-editor-wrapper {
    overflow-x: auto;
    padding: 2rem;
    background: var(--mc-tool-surface);
    border: 1px solid var(--mc-tool-border);
    border-radius: 4px;
    min-height: 400px;
    display: flex;
    align-items: center;
    /* Vertically center the whole tree */
    justify-content: flex-start;
    position: relative;
}

/* Tree Structure */
.t-node-wrapper {
    display: flex;
    align-items: center;
}

.t-children {
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin-left: 3rem;
    /* Space for edge lines */
    position: relative;
    gap: 1rem;
}

/* The visual Node */
.t-node {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.t-node-content {
    background: var(--mc-tool-surface);
    border: 2px solid var(--mc-tool-accent);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    min-width: 60px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.t-node-content:hover {
    border-color: var(--mc-tool-accent-strong);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.t-node-content.is-root {
    background: var(--mc-tool-accent-bg);
    border-color: #1d4ed8;
}

.t-node-controls {
    display: flex;
    gap: 0.25rem;
    margin-top: 0.25rem;
    opacity: 0;
    transition: opacity 0.2s;
}

.t-node:hover .t-node-controls {
    opacity: 1;
}

/* Buttons */
.btn-mini {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    color: white;
}

.btn-add {
    background: var(--mc-tool-success);
}

.btn-add:hover {
    background: var(--mc-tool-success-strong);
}

.btn-del {
    background: var(--mc-tool-danger);
}

.btn-del:hover {
    background: var(--mc-tool-danger-strong);
}

/* Edge Labels (floating) */
.t-edge-label {
    background: var(--mc-tool-surface);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--mc-tool-border-strong);
    font-size: 0.85rem;
    cursor: pointer;
    z-index: 5;
    white-space: nowrap;
}

.t-edge-label:hover {
    border-color: var(--mc-tool-accent);
    color: var(--mc-tool-accent);
}

/* SVG Line Layer */
#tree-svg-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

#tree-labels-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
    pointer-events: auto;
    /* Allow clicking labels */
}

/* Textarea Output */
#latex-output {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--mc-tool-border);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    background: var(--mc-tool-surface-alt);
    color: var(--mc-tool-text);
    resize: vertical;
}

/* Action Buttons */
.btn-action {
    padding: 0.5rem 1rem;
    background: var(--mc-tool-accent);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
}

.btn-action:hover {
    background: var(--mc-tool-accent-strong);
}

.btn-secondary {
    background: var(--mc-tool-surface-muted);
    color: var(--mc-tool-text);
    border: 1px solid var(--mc-tool-border-strong);
    border-radius: 6px;
}

.btn-secondary:hover {
    background: var(--mc-tool-border);
    color: var(--mc-tool-text-dark);
}

/* Bouton Afficher en SVG */
.btn-svg {
    background: var(--mc-tool-success-strong);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.btn-svg:hover {
    background: #047857;
}

.btn-svg:disabled {
    background: var(--mc-tool-text-muted);
    cursor: wait;
}

/* Zone de prévisualisation SVG */
#svg-preview-container {
    margin-top: 1rem;
    border: 1px solid var(--mc-tool-border);
    border-radius: 6px;
    overflow: hidden;
}

#svg-preview-content {
    padding: 1.5rem;
    background: white;
    text-align: center;
    overflow-x: auto;
}

#svg-preview-content svg {
    max-width: 100%;
    height: auto;
}