* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Monaco', 'Courier New', monospace;
            background: linear-gradient(135deg, #1e1e2e 0%, #2d2d44 100%);
            overflow: hidden;
            color: #e0e0e0;
        }
        
        #canvas {
            display: block;
            cursor: grab;
        }
        
        #canvas:active {
            cursor: grabbing;
        }
        
        #sidebar {
            position: fixed;
            right: 0;
            top: 0;
            width: 350px;
            height: 100vh;
            background: rgba(20, 20, 30, 0.95);
            border-left: 2px solid #4a9eff;
            padding: 30px;
            overflow-y: auto;
            transition: transform 0.3s ease, width 0.1s;
            box-shadow: -5px 0 20px rgba(0, 0, 0, 0.5);
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            color: #4a9eff;
            margin-bottom: 10px;
            letter-spacing: 1px;
        }
        
        .subtitle {
            font-size: 12px;
            color: #888;
            margin-bottom: 30px;
            line-height: 1.6;
        }
        
        .section {
            margin-bottom: 25px;
            padding-bottom: 20px;
            border-bottom: 1px solid #333;
        }
        
        .section:last-child {
            border-bottom: none;
        }
        
        .section-title {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 12px;
            color: #4a9eff;
            font-weight: bold;
        }
        
        .section-content {
            font-size: 13px;
            line-height: 1.7;
            color: #ccc;
        }
        
        .node-info {
            background: rgba(74, 158, 255, 0.1);
            border-left: 3px solid #4a9eff;
            padding: 12px;
            margin-top: 12px;
            font-size: 12px;
        }
        
        .node-title {
            font-weight: bold;
            color: #4a9eff;
            margin-bottom: 5px;
        }
        
        .stat {
            display: flex;
            justify-content: space-between;
            margin: 5px 0;
            font-size: 12px;
        }
        
        .stat-label {
            color: #888;
        }
        
        .stat-value {
            color: #4a9eff;
            font-weight: bold;
        }
        
        #info {
            position: fixed;
            bottom: 20px;
            left: 20px;
            font-size: 11px;
            color: #888;
            background: rgba(20, 20, 30, 0.8);
            padding: 10px 15px;
            border-radius: 5px;
            border: 1px solid #333;
        }
        
        .legend {
            margin-top: 15px;
        }
        
        .legend-item {
            display: flex;
            align-items: center;
            margin: 8px 0;
            font-size: 11px;
        }
        
        .legend-shape {
            width: 20px;
            height: 20px;
            margin-right: 10px;
            border: 2px solid #4a9eff;
            background: transparent;
        }
        
        .legend-shape.circle {
            border-radius: 50%;
        }
        
        .legend-shape.square {
            border-radius: 2px;
        }
        
        .legend-shape.triangle {
            width: 0;
            height: 0;
            border: none;
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            border-bottom: 17px solid #4a9eff;
            background: transparent;
        }
        
        .legend-shape.center {
            background: #ff6b35;
            border-color: #ff6b35;
            border-radius: 50%;
        }
        
        .legend-shape.launch {
            background: linear-gradient(135deg, #00d4ff 0%, #0099ff 100%);
            border-color: #00d4ff;
            border-radius: 50%;
            box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
        }
        
        .app-highlight {
            background: rgba(0, 212, 255, 0.1);
            border-left: 3px solid #00d4ff;
            padding: 15px;
            margin-top: 15px;
            border-radius: 3px;
        }
        
        .app-highlight strong {
            color: #00d4ff;
        } 
        
        #sidebar.collapsed {
        transform: translateX(100%);
    }

    #resize-handle {
        position: absolute;
        left: 0;
        top: 0;
        width: 10px;
        height: 100%;
        cursor: ew-resize;
        background: transparent;
        transition: background 0.2s;
    }

    #resize-handle:hover {
        background: rgba(74, 158, 255, 0.3);
    }

    #resize-handle.dragging {
        background: rgba(74, 158, 255, 0.5);
    }

    #toggle-sidebar {
        position: fixed;
        right: 360px;
        top: 20px;
        background: rgba(20, 20, 30, 0.9);
        border: 2px solid #4a9eff;
        color: #4a9eff;
        padding: 10px 15px;
        cursor: pointer;
        font-family: 'Monaco', monospace;
        font-size: 11px;
        border-radius: 5px;
        transition: all 0.3s ease;
        z-index: 1000;
    }

    #toggle-sidebar:hover {
        background: rgba(74, 158, 255, 0.2);
    }

    #toggle-sidebar.collapsed {
        right: 20px;
    } #legend-box {
    position: fixed;
    top: 20px;
    left: 20px;
    background: rgba(20, 20, 30, 0.9);
    border: 2px solid #4a9eff;
    padding: 15px 20px;
    border-radius: 5px;
    z-index: 1000;
}

#legend-box .legend-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #4a9eff;
    font-weight: bold;
    margin-bottom: 10px;
}
        
        
        @keyframes pulse {
            0%, 100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.7;
                transform: scale(1.1);
            }
        }
        
        @media (max-width: 968px) {
    #sidebar {
        width: 100%;
        height: auto;
        max-height: 50vh;
        top: auto;
        bottom: 0;
        border-left: none;
        border-top: 2px solid #4a9eff;
        padding: 20px;
    }
    
    #sidebar.collapsed {
        transform: translateY(100%);  /* Slide down instead of right */
    }
    
    #toggle-sidebar {
        right: 20px;
        top: auto;
        bottom: 20px;
    }
    
    #toggle-sidebar.collapsed {
        right: 20px;
        bottom: 20px;
    }
    
    #legend-box {
        top: 10px;
        left: 10px;
        padding: 10px 15px;
        max-width: calc(100vw - 120px);  /* Leave space for toggle button */
    }
    
    #legend-box .legend-title {
        font-size: 10px;
        margin-bottom: 8px;
    }
    
    .legend-item {
        font-size: 10px;
        margin: 5px 0;
    }
    
    .legend-shape {
        width: 16px;
        height: 16px;
        margin-right: 8px;
    }
    
    .legend-shape.triangle {
        border-left: 8px solid transparent;
        border-right: 8px solid transparent;
        border-bottom: 14px solid #4a9eff;
    }
    
    #info {
        display: none;  /* Hide on mobile to reduce clutter */
    }
    
    #resize-handle {
        display: none;  /* No resizing on mobile */
    }
}

.modal-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}
.modal-content {
    background: #1e1e2e;
    padding: 30px;
    border-radius: 10px;
    border: 2px solid #4a9eff;
    width: 80%;
    max-width: 800px;
}
.modal-content h2 {
    margin-top: 0;
    color: #4a9eff;
}
.modal-close-btn {
    background: #ff6b35;
    border: none;
    color: white;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 20px;
}
#topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    max-height: 50vh;
    overflow-y: auto;
}
.topic-card {
    padding: 20px;
    background: rgba(74, 158, 255, 0.1);
    border: 1px solid #4a9eff;
    color: #fff;
    text-align: center;
    font-family: 'Monaco', monospace;
    cursor: pointer;
    border-radius: 5px;
    transition: background 0.2s;
}
.topic-card:hover {
    background: rgba(74, 158, 255, 0.3);
}

/* Search Bar Styles */
#search-form {
    display: flex;
    margin-bottom: 15px;
}
#search-input {
    flex-grow: 1;
    padding: 8px;
    background: #1e1e2e;
    border: 1px solid #4a9eff;
    color: #fff;
    font-family: 'Monaco', monospace;
    border-radius: 3px 0 0 3px;
}
#search-form button {
    padding: 8px 12px;
    background: #4a9eff;
    border: 1px solid #4a9eff;
    color: #fff;
    cursor: pointer;
    border-radius: 0 3px 3px 0;
}

/* Search Results Styles */
#search-results {
    max-height: 400px;
    overflow-y: auto;
}
.search-result-item {
    background: rgba(74, 158, 255, 0.1);
    border-left: 3px solid #4a9eff;
    padding: 10px;
    margin-bottom: 10px;
    font-size: 12px;
}
.search-result-item .title {
    font-weight: bold;
    color: #fff;
    display: block;
    margin-bottom: 5px;
}
.search-result-item .title a {
    color: #fff;
    text-decoration: none;
}
.search-result-item .title a:hover {
    text-decoration: underline;
}
.search-result-item .page {
    font-size: 11px;
    color: #4a9eff;
    margin-bottom: 5px;
}
.search-result-item .snippet {
    color: #ccc;
    line-height: 1.5;
}

/* --- Accordion Sidebar Styles --- */
.topic-header {
    font-size: 13px;
    font-weight: bold;
    color: #4a9eff;
    margin-top: 10px;
    padding: 5px 5px 5px 20px; /* Add padding for the icon */
    cursor: pointer;
    position: relative;
    border-radius: 3px;
    transition: background 0.2s;
}

.topic-header:hover {
    background: rgba(74, 158, 255, 0.1);
}

/* Style for topics with no books */
.topic-header.empty {
    color: #888;
    cursor: default;
}
.topic-header.empty:hover {
    background: none;
}

/* Add a '+' icon before the header */
.topic-header::before {
    content: '+';
    position: absolute;
    left: 5px;
    top: 5px;
    font-weight: bold;
    color: #4a9eff;
}

/* Change icon to a '−' (minus sign) when active */
.topic-header.active::before {
    content: '−';
}

/* Don't show an icon for empty topics */
.topic-header.empty::before {
    content: '';
}

/* Style for the book list */
.book-list {
    list-style: none; /* Removes bullets */
    margin: 5px 0 0 0;
}