/* Teaching Graph Styles */
#mindmap-container {
    background-color: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

#mindmap-svg {
    border-radius: 8px;
    background: radial-gradient(circle at center, #ffffff 0%, #f8f9fa 100%);
}

/* Filter Controls */
.filter-controls .btn {
    margin: 0 5px 10px 5px;
    border-radius: 25px;
    padding: 8px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.filter-controls .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.filter-controls .btn.active {
    background-color: var(--rwth-petrol-100);
    border-color: var(--rwth-petrol-100);
    color: white;
}

/* Graph Node Styles */
.graph-node {
    cursor: pointer;
    transition: all 0.3s ease;
}

.graph-node:hover {
    filter: brightness(1.1);
    transform: scale(1.05);
}

/* Center Node (Rectangle) */
.graph-node.center-node rect {
    fill: var(--rwth-petrol-100);
    stroke: var(--rwth-petrol-75);
    stroke-width: 3px;
}

.graph-node.center-node text {
    font-family: 'Lato', sans-serif;
    font-weight: bold;
    text-anchor: middle;
    dominant-baseline: middle;
    fill: white;
    font-size: 14px;
    pointer-events: none;
}

/* Chair Nodes (Ellipses) */
.graph-node.chair-node ellipse {
    fill: var(--rwth-orange-100);
    stroke: var(--rwth-orange-75);
    stroke-width: 2px;
}

.graph-node.chair-node text {
    font-family: 'Lato', sans-serif;
    font-weight: 600;
    text-anchor: middle;
    dominant-baseline: middle;
    fill: white;
    font-size: 11px;
    pointer-events: none;
}

/* Course Nodes (Text with background) */
.graph-node.course-node .course-bg {
    fill: white;
    stroke: var(--rwth-schwarz-50);
    stroke-width: 1px;
    opacity: 0.9;
}

.graph-node.course-node.computer-science .course-bg {
    fill: var(--rwth-blau-25);
    stroke: var(--rwth-blau-75);
}

.graph-node.course-node.mathematics .course-bg {
    fill: var(--rwth-rot-25);
    stroke: var(--rwth-rot-75);
}

.graph-node.course-node.business .course-bg {
    fill: var(--rwth-orange-25);
    stroke: var(--rwth-orange-75);
}

.graph-node.course-node text {
    font-family: 'Lato', sans-serif;
    font-weight: 500;
    text-anchor: middle;
    dominant-baseline: middle;
    fill: var(--rwth-schwarz-100);
    font-size: 10px;
    pointer-events: none;
}

.graph-node.course-node text tspan {
    text-anchor: middle;
}

/* Graph Links */
.graph-link {
    fill: none;
    stroke: var(--rwth-schwarz-25);
    stroke-width: 2px;
    transition: all 0.3s ease;
}

.graph-link.chair-link {
    stroke: var(--rwth-petrol-50);
    stroke-width: 3px;
}

.graph-link.course-link {
    stroke: var(--rwth-orange-50);
    stroke-width: 1.5px;
}

.graph-link:hover {
    stroke-width: 4px;
    stroke: var(--rwth-petrol-100);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #mindmap-svg {
        height: 500px;
    }
    
    .filter-controls .btn {
        font-size: 12px;
        padding: 6px 15px;
        margin: 2px;
    }
    
    .graph-node.center-node text {
        font-size: 12px;
    }
    
    .graph-node.chair-node text {
        font-size: 9px;
    }
    
    .graph-node.course-node text {
        font-size: 8px;
    }
    
    .graph-node.center-node rect {
        transform: scale(0.8);
    }
    
    .graph-node.chair-node ellipse {
        transform: scale(0.8);
    }
}

/* Tooltip styles */
.graph-tooltip {
    position: absolute;
    padding: 10px;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    border-radius: 5px;
    pointer-events: none;
    font-size: 12px;
    max-width: 250px;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.graph-tooltip.show {
    opacity: 1;
}

/* Animation for node appearance */
.graph-node {
    opacity: 0;
    animation: fadeInNode 0.6s ease forwards;
}

@keyframes fadeInNode {
    from {
        opacity: 0;
        transform: scale(0.3);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.graph-node.hidden {
    opacity: 0.2;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.graph-link.hidden {
    opacity: 0.2;
    transition: opacity 0.4s ease;
}

/* Animation delays for staggered appearance */
.graph-node.center-node {
    animation-delay: 0.1s;
}

.graph-node.chair-node {
    animation-delay: 0.3s;
}

.graph-node.course-node {
    animation-delay: 0.5s;
}