:root {
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-surface: #FFFBFE;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-error: #B3261E;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-tertiary-container: #FFD8E4;
}
body {
    font-family: 'Roboto', sans-serif;
    background-color: #F5F5F5;
    color: var(--md-sys-color-on-surface);
}
/* Material 3 Overrides for Bootstrap 4 */
.m3-card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
    background: var(--md-sys-color-surface);
}
.m3-title {
    font-weight: 700;
    color: var(--md-sys-color-on-surface);
}
.m3-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    margin-bottom: 0.25rem;
}
.m3-input {
    border-radius: 12px !important;
    border: 1px solid var(--md-sys-color-outline) !important;
    padding: 0.75rem 1rem !important;
    transition: border-color 0.2s;
}
.m3-input:focus {
    border-color: var(--md-sys-color-primary) !important;
    box-shadow: 0 0 0 1px var(--md-sys-color-primary) !important;
}
.m3-btn-primary {
    background-color: var(--md-sys-color-primary) !important;
    color: var(--md-sys-color-on-primary) !important;
    border-radius: 20px !important;
    padding: 0.5rem 1.5rem !important;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
    border: none !important;
    box-shadow: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15) !important;
}
.m3-btn-secondary {
    background-color: var(--md-sys-color-primary-container) !important;
    color: var(--md-sys-color-on-primary-container) !important;
    border-radius: 20px !important;
    padding: 0.5rem 1.5rem !important;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
    border: none !important;
}
.m3-btn-danger {
    background-color: var(--md-sys-color-error) !important;
    color: var(--md-sys-color-on-error) !important;
    border-radius: 20px !important;
    padding: 0.5rem 1.5rem !important;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
    border: none !important;
}
.m3-surface {
    background: var(--md-sys-color-surface);
    border-radius: 28px;
    border: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
}
.m3-list-item {
    border: none !important;
    border-radius: 12px !important;
    margin-bottom: 4px;
    padding: 12px !important;
}
.m3-list-item:hover {
    background-color: rgba(103, 80, 164, 0.08) !important;
}
/* Graph Canvas Styles */
#canvas-container {
    position: relative;
    width: 100%;
    height: 75vh;
    overflow: hidden;
    background-color: #F0EDF4;
    border-radius: 16px;
    border: 1px solid var(--md-sys-color-outline);
    cursor: grab;
}
#canvas-container:active {
    cursor: grabbing;
}
#canvas-inner {
    position: absolute;
    top: 0; left: 0;
    transform-origin: 0 0;
}
.graph-node {
    position: absolute;
    width: 220px;
    background: var(--md-sys-color-surface);
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
    padding: 16px;
    cursor: pointer;
    transition: box-shadow 0.2s, transform 0.1s;
    z-index: 2;
    border: 2px solid transparent;
    user-select: none;
}
.graph-node:hover { 
    box-shadow: 0 6px 14px rgba(0,0,0,0.15); 
}
.graph-node.start-node { 
    border-color: var(--md-sys-color-primary);
    background-color: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}
.graph-node.terminal-node { 
    background-color: var(--md-sys-color-tertiary-container); 
    border-color: var(--md-sys-color-tertiary);
}
.node-header {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.node-subheader {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-bottom: 12px;
}
.node-actions {
    display: flex;
    justify-content: space-between;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding-top: 8px;
}
.node-action-btn {
    background: none;
    border: none;
    color: var(--md-sys-color-primary);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 8px;
    cursor: pointer;
}
.node-action-btn:hover {
    background-color: rgba(103, 80, 164, 0.15);
}
/* SVG Edges */
#svg-edges {
    position: absolute;
    top: 0; left: 0;
    width: 10000px; 
    height: 10000px;
    z-index: 1;
    pointer-events: none;
}
.edge-path {
    fill: none;
    stroke: var(--md-sys-color-outline);
    stroke-width: 2;
    pointer-events: stroke;
    cursor: pointer;
}
.edge-path:hover { 
    stroke: var(--md-sys-color-primary); 
    stroke-width: 4; 
}
.edge-label {
    font-size: 11px; /* Чуть меньше шрифт */
    pointer-events: none;
    fill: var(--md-sys-color-on-surface);
    font-weight: 500;
    /* Добавляем обводку текста белым цветом для контраста на фоне линий */
    paint-order: stroke fill;
    stroke: #F0EDF4; /* Цвет фона канваса */
    stroke-width: 3px;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Увеличим отступы между уровнями в calculateLayout, если нужно больше места для маневра ребер */
/* В JS коде calculateLayout уже есть yGap = 150. Можно увеличить до 180 или 200, если ребра все еще налезают на узлы */
.linking-active .graph-node {
    border-color: var(--md-sys-color-primary) !important;
    animation: pulse 1.5s infinite;
}
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(103, 80, 164, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(103, 80, 164, 0); }
    100% { box-shadow: 0 0 0 0 rgba(103, 80, 164, 0); }
}