body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f7f6;
    color: #333;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden; /* Prevent body scroll when sidebar is long */
}

header {
    background-color: #d9232d; /* McGill Red */
    color: white;
    padding: 15px 30px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0 0 10px 0;
    font-size: 1.8em;
}

.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.controls label {
    font-weight: 500;
}

.controls select,
.controls input[type="text"],
.controls button {
    padding: 8px 12px;
    border-radius: 5px;
    border: 1px solid #ccc;
    font-size: 0.9em;
}

.controls select {
    min-width: 200px;
}

.controls input[type="text"] {
    min-width: 250px;
}

.controls button {
    background-color: #ac1c24; /* Darker McGill Red */
    color: white;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s ease;
}

.controls button:hover {
    background-color: #8a161c;
}

main {
    display: flex;
    flex-grow: 1;
    position: relative; /* For sidebar positioning */
    overflow: hidden; /* Prevent main from overflowing */
}

#course-graph {
    flex-grow: 1;
    height: 100%;
    background-color: #ffffff;
}

#course-sidebar {
    width: 350px;
    min-width: 300px;
    max-width: 40%;
    background-color: #fff;
    border-left: 1px solid #ddd;
    box-shadow: -2px 0 5px rgba(0,0,0,0.1);
    position: fixed; /* Changed from absolute for better context */
    right: 0;
    top: 0; /* Align with top of viewport */
    bottom: 0; /* Align with bottom of viewport */
    height: 100vh; /* Full viewport height */
    padding: 20px;
    box-sizing: border-box;
    overflow-y: auto;
    transition: transform 0.3s ease-in-out;
    transform: translateX(100%); /* Start hidden off-screen */
    z-index: 1000;
}

#course-sidebar.visible {
    transform: translateX(0);
}

#course-sidebar.hidden {
    transform: translateX(100%);
}

#close-sidebar {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: #777;
}

#close-sidebar:hover {
    color: #333;
}

#sidebar-content h2 {
    margin-top: 10px;
    font-size: 1.4em;
    color: #d9232d;
}

#sidebar-content h3 {
    font-size: 1.1em;
    color: #333;
    margin-top: 15px;
    margin-bottom: 5px;
    border-bottom: 1px solid #eee;
    padding-bottom: 3px;
}

#sidebar-content p,
#sidebar-content ul {
    font-size: 0.9em;
    line-height: 1.6;
    color: #555;
}

#sidebar-content ul {
    padding-left: 20px;
    list-style-type: square;
}

#sidebar-content .raw-reqs {
    font-family: 'Courier New', Courier, monospace;
    background-color: #f0f0f0;
    padding: 8px;
    border-radius: 4px;
    font-size: 0.85em;
    white-space: pre-wrap; /* Preserve whitespace and wrap */
    word-break: break-all;
}

/* Common Search Container Styles */
.program-search-container,
.category-search-wrapper {
    position: relative; /* For positioning the suggestions box */
    display: inline-block; /* Or 'block' if you want it on its own line */
}

/* Program Search Specific Styles */


#program-search-input {
    color: #333333; /* Dark grey for typed text */
    /* Inherits styles from .controls input[type="text"] which is good */
    /* Add any specific overrides if needed, e.g., width */
    min-width: 220px; /* Adjust as needed */
}

.suggestions-container {
    display: none; /* Hidden by default */
    position: absolute;
    border: 1px solid #ddd;
    background-color: white;
    max-height: 200px;
    overflow-y: auto;
    z-index: 1001; /* Ensure it's above the graph but below modals if any */
}

.suggestions-container div {
    padding: 10px;
    cursor: pointer;
    border-bottom: 1px solid #eee;
    color: #333333; /* Ensure suggestion text is visible */
}

.suggestions-container div:last-child {
    border-bottom: none;
}

.suggestions-container div:hover {
    background-color: #f0f0f0;
}

#category-search-input {
    color: #333333; /* Dark grey for typed text */
    min-width: 180px; /* Adjust as needed */
}

#graph-container {
    position: relative; /* Needed for absolute positioning of the loading indicator */
    flex-grow: 1; /* Allow it to take available horizontal space in main */
    height: 100%; /* Allow it to take available vertical space in main */
    display: flex; /* To allow #course-graph to use flex-grow within it if needed */
}

#loading-indicator {
    position: absolute;
    display: flex; /* Use flex to align spinner and text */
    flex-direction: column; /* Stack spinner and text vertically */
    align-items: center; /* Center items horizontally */
    justify-content: center; /* Center items vertically */
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    z-index: 1000; /* Ensure it's on top */
    font-size: 1.2em;
    color: #333;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1); /* Lighter track for the spinner on a light background */
    border-left-color: #d9232d; /* McGill Red for the active part of the spinner */
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 10px; /* Space between spinner and text */
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Vis.js specific styling if needed */
.vis-network:focus {
    outline: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5em;
    }
    .controls {
        flex-direction: column;
        gap: 10px;
    }
    .controls select,
    .controls input[type="text"],
    .controls button {
        width: 90%;
        max-width: 300px;
    }
    #course-sidebar {
        width: 80%;
        max-width: none;
        border-left: none;
        box-shadow: 0 0 15px rgba(0,0,0,0.2);
    }
}