html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
}

header {
    background-color: #9e70f3;
    color: white;
    padding: 0.4rem 1rem;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

header h1 {
    margin: 0;
    font-size: 1.3rem;
}

header p {
    margin: 0.2rem 0 0;
    opacity: 0.9;
    font-size: 0.95rem;
}

main {
    flex: 1;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.instructions {
    background-color: #e8f5e9;
    border: 1px solid #4CAF50;
    border-radius: 6px;
    padding: 0.2rem 0.7rem;
    margin-bottom: 0.3rem;
    text-align: center;
}

.instructions p {
    margin: 0;
    font-size: 0.85rem;
    color: #2e7d32;
}

.instructions strong {
    color: #1b5e20;
}

#mindmap {
    flex: 1;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    min-height: 600px;
    position: relative;
    overflow: auto;
}

#mindmap svg {
    position: absolute;
    min-width: 100%;
    min-height: 100%;
}

/* Customize scrollbars for webkit browsers */
#mindmap::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

#mindmap::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 8px;
}

#mindmap::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 8px;
    border: 3px solid #f1f1f1;
}

#mindmap::-webkit-scrollbar-thumb:hover {
    background: #666;
}

/* Customize scrollbars for Firefox */
#mindmap {
    scrollbar-width: thin;
    scrollbar-color: #888 #f1f1f1;
}

.controls {
    display: flex;
    justify-content: center;
    padding: 1rem 0;
}

.download-btn {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

.download-btn:hover {
    background-color: #45a049;
}

svg {
    cursor: grab;
}

svg:active {
    cursor: grabbing;
}

.node ellipse {
    fill: #fff;
    stroke: #4CAF50;
    stroke-width: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.node text {
    font-size: 14px;
    font-family: Arial, sans-serif;
    fill: #333;
    transition: all 0.3s ease;
    user-select: none;
}

.node-symbol {
    fill: #4CAF50;
    cursor: pointer;
    font-family: Arial, sans-serif;
    font-weight: bold;
}

.node-label {
    dominant-baseline: middle;
}

.node-collapsed .node-symbol {
    fill: #666;
}

.node:hover .node-symbol {
    fill: #2E7D32;
}

.link {
    fill: none;
    stroke: #ccc;
    stroke-width: 1.5px;
}

.node-expanded ellipse {
    fill: #E8F5E9;
}

.node:hover ellipse {
    fill: #E8F5E9;
    stroke-width: 3px;
}

.node-expanded:hover ellipse {
    fill: #C8E6C9;
}

.node:hover text.node-label {
    font-weight: bold;
}

.node-collapsed .node-children {
    display: none;
}

/* Add smooth transitions */
.node, .link {
    transition: all 0.3s ease;
}

.site-footer {
    background-color: #f3eaff;
    color: #6a4fb6;
    text-align: center;
    padding: 0 0;
    font-size: 0.85rem;
    border-top: 1px solid #e0d7fa;
    margin-top: 0;
}

.site-footer a {
    color: #7c4dff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.site-footer a:hover {
    color: #4a148c;
    text-decoration: underline;
}