:root {
    --neo-font: 'Archivo', sans-serif; /* Primary UI font */
    --d3-font: 'Space Mono', monospace; /* Specific font for D3 elements */
    --neo-bg: #f0f0f0;
    --neo-text: #000000;
    --neo-border: #000000;
    --neo-accent-red: #ff3e3e;
    --neo-accent-blue: #4A90E2;
    --neo-accent-green: #2ecc71;
    --neo-accent-purple: #9b59b6;
    --neo-white: #ffffff;
    --neo-dark-bg: #2c3e50;
    --neo-light-text: #ecf0f1;

    --d3-color-course: var(--neo-accent-blue);
    --d3-border-course: #357ABD;
    --d3-color-uncategorized-bg: #97C2FC;
    --d3-color-uncategorized-border: #2B7CE9;
    --d3-link-tag-tag-color: #e74c3c; /* Lighter red for tag-tag links */
}

body {
    font-family: var(--neo-font);
    color: var(--neo-text);
    margin: 0;
    background-color: var(--neo-bg);
    line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--neo-font);
    color: var(--neo-text);
    text-transform: uppercase;
    margin-top: 1.2em;
    margin-bottom: 0.6em;
}

header h1 {
    color: var(--neo-text); 
    border-bottom: 3px solid var(--neo-border);
    padding-bottom: 10px;
    margin-bottom: 20px;
}


/* --- SIDEBAR STYLES (NEO-BRUTALIST) --- */
#sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 300px;
    background-color: var(--neo-white);
    color: var(--neo-text);
    padding: 20px;
    padding-top: 70px;
    box-sizing: border-box;
    border-right: 3px solid var(--neo-border);
    box-shadow: 5px 0px 0px rgba(0,0,0,0.3);
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    overflow-y: auto;
}
#sidebar.expanded { transform: translateX(0); }

#sidebarToggle {
    position: fixed; left: 15px; top: 15px; z-index: 101;
    background-color: var(--neo-accent-red);
    color: var(--neo-white);
    border: 2px solid var(--neo-border);
    width: 40px; height: 40px; font-size: 1.6em; line-height: 36px;
    text-align: center; font-weight: bold; cursor: pointer;
    border-radius: 0;
    box-shadow: 3px 3px 0px var(--neo-border);
    transition: all 0.1s ease;
}
#sidebarToggle:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px var(--neo-border);
}
#sidebarToggle:active {
    transform: translate(3px, 3px);
    box-shadow: none;
}

#main-controls { display: flex; flex-direction: column; gap: 20px; width: 100%; }

.control-section {
    background-color: var(--neo-bg);
    padding: 15px;
    border: 3px solid var(--neo-border);
    border-radius: 0;
}
.control-section h4 {
    margin-top: 0; margin-bottom: 15px; color: var(--neo-text);
    border-bottom: 2px solid var(--neo-border); padding-bottom: 10px;
    font-size: 1.1em;
    text-transform: capitalize;
}
.control-section h5 {
    margin-top: 18px;
    margin-bottom: 12px;
    color: var(--neo-text);
    font-size: 1em;
    border-top: 2px solid var(--neo-border);
    padding-top: 12px;
}
.control-section label {
    display: block; margin-bottom: 6px; font-size: 0.9em; color: var(--neo-text); font-weight: bold;
    text-transform: uppercase;
}

.control-section > input[type="text"], 
.control-section > input[type="number"],
.control-section > input[type="color"],
.control-section > textarea,
.control-section > select,
.control-section div > input[type="text"], 
.control-section div > input[type="number"],
.control-section div > input[type="color"],
.control-section div > textarea,
.control-section div > select {
    width: calc(100% - 10px);
    padding: 10px; margin-bottom: 12px;
    background-color: var(--neo-white);
    color: var(--neo-text);
    border: 2px solid var(--neo-border);
    border-radius: 0;
    box-sizing: border-box;
    font-family: var(--neo-font);
    font-size: 0.9em;
}
.control-section > input[type="color"],
.control-section div > input[type="color"] {
    height: 42px;
    padding: 4px;
}
.control-section > textarea,
.control-section div > textarea { min-height: 80px; }

.control-section > input::placeholder, .control-section > textarea::placeholder,
.control-section div > input::placeholder, .control-section div > textarea::placeholder {
    color: #777;
    font-family: var(--neo-font);
}

.control-section > input[type="number"]:disabled,
.control-section div > input[type="number"]:disabled {
    background-color: #ccc;
    color: #888;
    cursor: not-allowed;
    border-color: #aaa;
}

#sidebar .control-section > button,
#sidebar #import-tags-modal .modal-content button.control-button {
    background-color: var(--neo-accent-blue);
    color: var(--neo-white);
    border: 2px solid var(--neo-border);
    padding: 10px 15px;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.1s ease;
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 5px;
    font-family: var(--neo-font);
    font-weight: bold;
    text-transform: uppercase;
    font-size: 0.9em;
    box-shadow: 3px 3px 0px var(--neo-border);
}
#sidebar .control-section > button:hover,
#sidebar #import-tags-modal .modal-content button.control-button:hover {
    background-color: #357ABD;
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px var(--neo-border);
}
#sidebar .control-section > button:active,
#sidebar #import-tags-modal .modal-content button.control-button:active {
    transform: translate(3px, 3px);
    box-shadow: none;
}
#sidebar .control-section > button:disabled {
    background-color: #aaa;
    color: #ddd;
    border-color: #888;
    cursor: not-allowed;
    box-shadow: none;
}

/* Specific Sidebar Button Colors */
#sidebar #addTagButton { background-color: var(--neo-accent-purple); }
#sidebar #addTagButton:hover { background-color: #8e44ad; }
#sidebar #addNewCourseButton { background-color: var(--neo-accent-green); }
#sidebar #addNewCourseButton:hover { background-color: #27ae60; }


#sidebar .control-section div input[type="checkbox"] {
    vertical-align: middle;
    margin-right: 5px;
    margin-bottom: 10px;
    appearance: none;
    -webkit-appearance: none;
    background-color: var(--neo-white);
    border: 2px solid var(--neo-border);
    width: 18px;
    height: 18px;
    position: relative;
    cursor: pointer;
}
#sidebar .control-section div input[type="checkbox"]:checked {
    background-color: var(--neo-text);
}
#sidebar .control-section div input[type="checkbox"]:checked::after {
    content: '✔';
    font-size: 12px;
    color: var(--neo-white);
    position: absolute;
    left: 2px;
    top: -1px;
}

#sidebar .control-section div label[for^="graphDisablePhysics"],
#sidebar .control-section div label[for^="graphToggleTagToTagEdges"] {
    display: inline;
    margin-left: 5px;
    margin-bottom: 0;
    font-weight: normal;
    color: var(--neo-text);
    text-transform: none;
}

#sidebar .control-section button.small-confirm-button,
#sidebar .control-section button.small-cancel-button {
    background-color: var(--neo-accent-green);
    padding: 6px 12px;
    width: auto;
    font-size: 0.8em;
    margin-right: 8px;
}
#sidebar .control-section button.small-cancel-button {
    background-color: var(--neo-accent-red);
}
#sidebar .control-section button.small-confirm-button:hover {
    background-color: #27ae60;
}
#sidebar .control-section button.small-cancel-button:hover {
    background-color: #c0392b;
}

#sidebar #newTagCategoryPrompt {
    margin-top: 10px;
    padding: 10px;
    background-color: var(--neo-white);
    border: 2px solid var(--neo-border);
    border-radius: 0;
}
#sidebar #newTagCategoryPrompt label {
    font-size: 0.9em !important;
    margin-bottom: 5px !important;
}
#sidebar #newTagCategoryPrompt select {
    margin-bottom: 10px !important;
}


/* --- APP CONTAINER & HEADER (NEO-BRUTALIST) --- */
.app-container {
    margin: 25px 25px 25px 70px;
    padding: 25px;
    background-color: var(--neo-white);
    border: 3px solid var(--neo-border);
    box-shadow: 6px 6px 0px rgba(0,0,0,0.4);
    border-radius: 0;
    transition: margin-left 0.3s ease-in-out;
}
#sidebar.expanded + .app-container { margin-left: 330px; }

header {
    text-align: left;
    margin-bottom: 25px;
    padding-bottom: 0;
    border-bottom: none;
}
header p {
    font-size: 0.9em;
    color: #555;
    margin-top: -15px;
    margin-bottom: 20px;
}


/* --- CURRICULUM LAYOUT & CATEGORIES (NEO-BRUTALIST) --- */
#curriculum-layout { display: flex; gap: 20px; flex-wrap: wrap; align-items: flex-start; }

.category-zone {
    flex: 1 1 100%; max-width: 100%;
    background-color: var(--neo-bg);
    border: 3px solid var(--neo-border);
    border-radius: 0;
    padding: 15px;
    box-shadow: 4px 4px 0px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
}
.category-zone h2 { 
    margin-top: 0; font-size: 1.2em;
    padding-bottom: 10px; margin-bottom: 15px; text-align: center;
    border-bottom: 2px solid var(--neo-border);
}
.category-zone .course-list {
    display: flex; flex-direction: row; overflow-x: auto; overflow-y: hidden;
    gap: 10px;
    align-items: flex-start; padding-bottom: 15px;
    min-height: 160px;
}
.category-zone .course-list::-webkit-scrollbar { height: 12px; }
.category-zone .course-list::-webkit-scrollbar-track { background: #ccc; border-radius: 0; border: 1px solid var(--neo-border);}
.category-zone .course-list::-webkit-scrollbar-thumb { background: var(--neo-text); border-radius: 0; border: 1px solid var(--neo-border); }
.category-zone .course-list::-webkit-scrollbar-thumb:hover { background: #333; }

.semester-footer {
    margin-top: 15px; padding-top: 10px; border-top: 2px solid var(--neo-border);
    text-align: right; font-weight: bold; font-size: 0.95em; color: var(--neo-text);
    text-transform: uppercase;
}
.semester-footer .total-ects { color: var(--neo-accent-red); font-size: 1.1em; }


/* --- COURSE ITEMS (NEO-BRUTALIST) --- */
.course-item {
    width: 180px; min-width: 160px; max-width: 190px; min-height: 150px;
    padding: 10px;
    border: 2px solid var(--neo-border);
    border-radius: 0;
    background-color: var(--neo-white);
    cursor: grab;
    transition: transform 0.1s ease-out, box-shadow 0.1s;
    display: flex; flex-direction: column; justify-content: space-between;
    box-sizing: border-box; flex-grow: 0; flex-shrink: 0;
    flex-basis: 180px;
    box-shadow: 3px 3px 0px rgba(0,0,0,0.3);
}
.course-item:hover {
    box-shadow: 4px 4px 0px rgba(0,0,0,0.4);
    transform: translate(-1px, -1px);
}

.course-item h3 { 
    font-size: 0.95em; margin-top: 0; margin-bottom: 5px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    font-weight: bold;
}
.course-item p.course-name {
    font-size: 0.8em; margin-bottom: 6px; flex-grow: 1;
    color: #333;
    line-height: 1.4; max-height: 2.8em; overflow: hidden;
    text-transform: none;
}
.course-details { font-size: 0.75em; color: #444; margin-bottom: 6px; }
.course-details span { margin-right: 8px; display: block; }
.course-details strong { color: var(--neo-text); }
.course-details span.lecturer-info {
    font-style: normal;
    color: #555;
    margin-top: 4px;
    font-size: 0.9em; 
}

.course-tags { font-size: 0.7em; margin-top: auto; line-height: 1.5; }
.course-tags .tag {
    background-color: var(--neo-text);
    color: var(--neo-white);
    padding: 3px 6px;
    border-radius: 0;
    margin-right: 4px; margin-bottom: 4px; display: inline-block;
    padding-left: 6px;
    border-left: none;
    font-weight: bold;
    text-transform: lowercase;
}
.course-tags .tag .remove-tag {
    margin-left: 5px; cursor: pointer; font-weight: bold; opacity: 0.8;
    color: var(--neo-accent-red);
}
.course-tags .tag .remove-tag:hover { opacity: 1; }

.course-item.dragging {
    opacity: 0.7; cursor: grabbing;
    box-shadow: 6px 6px 0px var(--neo-accent-red) !important;
    transform: scale(1.03) rotate(2deg);
    border-color: var(--neo-accent-red);
}
.course-item.active-edit {
    border: 3px solid var(--neo-accent-blue);
    box-shadow: 0 0 0 3px var(--neo-accent-blue), 3px 3px 0px var(--neo-border);
}
.course-item.selected-compare {
    border: 3px solid var(--neo-accent-green);
    box-shadow: 0 0 0 3px var(--neo-accent-green), 3px 3px 0px var(--neo-border);
}

.drag-placeholder {
    background-color: rgba(0, 0, 0, 0.05);
    border: 3px dashed #888;
    height: 150px; flex-basis: 180px; min-width: 160px; width: 180px;
    margin-right: 10px; box-sizing: border-box; border-radius: 0;
    flex-shrink: 0; flex-grow: 0;
}


/* --- MODALS (NEO-BRUTALIST) --- */
.modal {
    display: none; position: fixed; z-index: 1010; left: 0; top: 0;
    width: 100%; height: 100%; overflow: auto;
    background-color: rgba(0,0,0,0.75);
}
.modal-content:not(.d3-modal-content) {
    background-color: var(--neo-white);
    margin: 5% auto;
    padding: 25px;
    border: 3px solid var(--neo-border);
    width: 60%; max-width: 750px;
    border-radius: 0;
    position: relative;
    box-shadow: 8px 8px 0px rgba(0,0,0,0.5);
    font-family: var(--neo-font);
}
.modal-content:not(.d3-modal-content).large {
    width: 85%; max-width: 1200px;
}
#neighbor-visualization-modal .modal-content.large,
#network-metrics-modal .modal-content.large { 
     width: 90%; max-width: 1400px;
     height: 85vh; 
     display: flex;
     flex-direction: column;
}


.modal-content:not(.d3-modal-content) .close-button {
    color: var(--neo-text);
    float: right; font-size: 36px;
    font-weight: bold; line-height: 0.8;
    cursor: pointer;
    position: absolute;
    top: 10px;
    right: 15px;
    padding: 5px;
}
.modal-content:not(.d3-modal-content) .close-button:hover,
.modal-content:not(.d3-modal-content) .close-button:focus {
    color: var(--neo-accent-red);
    text-decoration: none;
}

.modal-content:not(.d3-modal-content) h2 { 
    margin-top: 0;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--neo-border);
    font-size: 1.5em;
}

.modal-content:not(.d3-modal-content) label {
    display: block;
    margin-top: 15px; margin-bottom: 5px;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 0.9em;
}
.modal-content:not(.d3-modal-content) input[type="text"],
.modal-content:not(.d3-modal-content) input[type="number"],
.modal-content:not(.d3-modal-content) input[type="hidden"],
.modal-content:not(.d3-modal-content) textarea,
.modal-content:not(.d3-modal-content) select { 
    width: calc(100% - 10px);
    padding: 10px;
    margin-bottom: 15px;
    background-color: var(--neo-white);
    color: var(--neo-text);
    border: 2px solid var(--neo-border);
    border-radius: 0;
    box-sizing: border-box;
    font-family: var(--neo-font);
    font-size: 1em;
}
.modal-content:not(.d3-modal-content) textarea { min-height: 100px; }
.modal-content:not(.d3-modal-content) input::placeholder,
.modal-content:not(.d3-modal-content) textarea::placeholder {
    color: #777;
    font-family: var(--neo-font);
}

.modal-content:not(.d3-modal-content) button {
    background-color: var(--neo-accent-blue);
    color: var(--neo-white);
    border: 2px solid var(--neo-border);
    padding: 12px 20px;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.1s ease;
    width: auto;
    min-width: 150px;
    margin-top: 10px;
    margin-right: 10px;
    font-family: var(--neo-font);
    font-weight: bold;
    text-transform: uppercase;
    font-size: 1em;
    box-shadow: 3px 3px 0px var(--neo-border);
}
.modal-content:not(.d3-modal-content) button:hover {
    background-color: #357ABD;
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px var(--neo-border);
}
.modal-content:not(.d3-modal-content) button:active {
    transform: translate(3px, 3px);
    box-shadow: none;
}

#workload-table-container, #syllabus-comparison-area {
    max-height: 70vh; overflow-y: auto; margin-top: 20px;
    border: 2px solid var(--neo-border);
    padding: 10px;
}
#workload-table-container table {
    width: 100%; border-collapse: collapse; font-size: 0.9em;
    border: 2px solid var(--neo-border);
}
#workload-table-container th,
#workload-table-container td {
    border: 1px solid var(--neo-border);
    padding: 10px 12px;
    text-align: left;
}
#workload-table-container th {
    background-color: var(--neo-text);
    color: var(--neo-white);
    position: sticky; top: 0; z-index: 10;
    font-weight: bold;
    text-transform: uppercase;
}
#workload-table-container tr:nth-child(even) { background-color: #e0e0e0; }
#workload-table-container tr:nth-child(odd) { background-color: var(--neo-bg); }

#workload-table-container .lecturer-total-row td {
    font-weight: bold;
    background-color: #ccc;
    color: var(--neo-text);
    text-transform: uppercase;
}
#workload-table-container .lecturer-total-row td:first-child { text-align: right; }

#syllabus-comparison-area {
    display: flex; justify-content: space-between; gap: 20px;
    padding: 0;
    border: none;
}
.syllabus-column {
    flex: 1;
    border: 2px solid var(--neo-border);
    padding: 15px;
    border-radius: 0;
    background-color: var(--neo-bg);
    overflow-y: auto; max-height: 65vh;
}
.syllabus-column h4 { 
    margin-top: 0;
    border-bottom: 2px solid var(--neo-border);
    padding-bottom: 8px;
    font-size: 1.1em;
}
.syllabus-column pre {
    white-space: pre-wrap; word-wrap: break-word;
    font-size: 0.9em; color: #333;
    background-color: var(--neo-white);
    padding: 10px;
    border: 1px solid #ccc;
    margin-top: 10px;
}

#import-tags-modal .modal-content label {
    font-size: 0.9em;
}
#import-tags-modal .modal-content p {
    margin-bottom: 8px;
    font-size: 0.9em;
}
#import-tags-modal .modal-content p small {
    color: #555;
    font-size: 0.85em;
}
#import-tags-modal .modal-content input[type="file"] {
    width: 100%;
    padding: 8px;
    border: 2px solid var(--neo-border);
    background: var(--neo-white);
    margin-bottom: 15px;
    font-family: var(--neo-font);
}
#import-tags-modal .modal-content button.control-button {
    min-width: 180px;
    margin-top: 15px;
}
#importTagsStatus {
    margin-top: 20px;
    padding: 12px;
    background-color: var(--neo-bg);
    border: 2px solid var(--neo-border);
    max-height: 180px;
    overflow-y: auto;
    font-size: 0.85em;
    line-height: 1.6;
}


/* --- D3 Network Visualization Styles --- */
.d3-network-modal .d3-modal-content { 
    background-color: #f0f0f0; 
    margin: 1% auto;
    padding: 0;
    width: 95%;
    max-width: 1600px;
    height: 95vh;
    overflow: hidden;
    display: flex;
    border: 3px solid var(--neo-border);
    box-shadow: 8px 8px 0px rgba(0, 0, 0, 0.5);
    font-family: var(--d3-font);
}

.d3-visualization-area {
    flex: 1;
    display: flex;
    position: relative;
    overflow: hidden;
    background-color: var(--neo-bg); 
}

.d3-controls-panel {
    width: 280px;
    padding: 20px;
    background-color: var(--neo-white);
    border-right: 3px solid var(--neo-border);
    overflow-y: auto;
    z-index: 10;
    height: 100%;
    box-shadow: 5px 0px 0px rgba(0, 0, 0, 0.1);
    font-family: var(--d3-font);
    position: relative;
}
.d3-controls-panel .close-button#closeTagNetworkModalD3 {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 28px;
    color: #aaa;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    font-weight: bold;
}
.d3-controls-panel .close-button#closeTagNetworkModalD3:hover {
    color: var(--neo-text);
}


.d3-controls-panel h2 { 
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 18px;
    color: var(--neo-text);
    text-transform: uppercase;
    border-bottom: 3px solid var(--neo-border);
    padding-bottom: 8px;
}

.d3-search-container {
    display: flex;
    margin-bottom: 20px;
}
.d3-search-container input { 
    flex: 1;
    padding: 10px;
    border: 3px solid var(--neo-border);
    font-family: var(--neo-font);
    font-size: 14px;
    background-color: var(--neo-white);
    margin-right: -3px;
    width: auto; margin-bottom: 0; border-radius:0; 
}
.d3-search-container button { 
    padding: 10px 15px;
    background-color: var(--neo-accent-red);
    color: var(--neo-white);
    border: 3px solid var(--neo-border);
    cursor: pointer;
    font-family: var(--neo-font);
    font-weight: bold;
    font-size: 14px;
    text-transform: uppercase;
    box-shadow: 3px 3px 0px var(--neo-border);
    transition: all 0.1s ease;
    width: auto; margin-bottom: 0; border-radius:0; 
}
.d3-search-container button:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px var(--neo-border);
}
.d3-search-container button:active {
    transform: translate(3px, 3px);
    box-shadow: none;
}

.d3-control-parameters, .d3-tag-link-parameters { /* Grouped for common collapsible styles */
    background-color: var(--neo-white);
    margin-bottom: 20px;
    border: 3px solid var(--neo-border);
    overflow: hidden;
}
.d3-control-header { /* Applies to both collapsible sections */
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background-color: var(--neo-text);
    color: var(--neo-white);
    cursor: pointer;
}
.d3-control-header h3 { 
    margin: 0;
    font-size: 14px;
    text-transform: uppercase;
    color: var(--neo-white); 
    border-bottom: none; 
    padding-bottom: 0; 
}
.d3-toggle-button { /* Applies to both collapsible sections */
    background: none;
    border: none;
    font-size: 16px;
    color: var(--neo-white);
    cursor: pointer;
    transition: transform 0.3s ease;
}
.d3-control-content { /* Applies to both collapsible sections */
    padding: 15px;
    max-height: 0; /* Collapsed by default */
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.4s ease-out;
}
.d3-control-parameters.expanded .d3-control-content,
.d3-tag-link-parameters.expanded .d3-control-content { /* When expanded */
    max-height: 500px; /* Adjust as needed */
    padding: 15px;
}
.d3-control-parameters.expanded .d3-toggle-button,
.d3-tag-link-parameters.expanded .d3-toggle-button { /* Arrow direction */
    transform: rotate(180deg);
}

/* Specific for tag link controls if different content height is needed */
#d3-tag-links-control-content {
    max-height: 0; /* Collapsed by default if not .expanded */
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.4s ease-out;
}
.d3-tag-link-parameters.expanded #d3-tag-links-control-content {
     max-height: 200px; /* Or scrollHeight if dynamic */
     padding: 15px;
}


.d3-parameter-group {
    margin-bottom: 15px;
}
.d3-parameter-group label { 
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--neo-text);
    font-weight: bold;
    text-transform: uppercase;
}
/* Specific label styling for checkbox in D3 controls */
.d3-parameter-group label[for="d3-toggle-tag-links"] {
    display: inline; /* Keep label next to checkbox */
    font-weight: normal;
    text-transform: none;
    margin-left: 5px;
}
.d3-parameter-group input[type="checkbox"] { /* Style for checkbox */
    vertical-align: middle;
    margin-right: 0;
    appearance: none;
    -webkit-appearance: none;
    background-color: var(--neo-white);
    border: 2px solid var(--neo-border);
    width: 16px;
    height: 16px;
    position: relative;
    cursor: pointer;
}
.d3-parameter-group input[type="checkbox"]:checked {
    background-color: var(--neo-text);
}
.d3-parameter-group input[type="checkbox"]:checked::after {
    content: '✔';
    font-size: 11px;
    color: var(--neo-white);
    position: absolute;
    left: 1px;
    top: -1px;
}

.d3-parameter-group input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 10px;
    border-radius: 0;
    background: #ddd;
    border: 2px solid var(--neo-border);
    outline: none;
    padding: 0;
}
.d3-parameter-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 0;
    background: var(--neo-accent-red);
    cursor: pointer;
    border: 2px solid var(--neo-border);
}
.d3-parameter-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 0;
    background: var(--neo-accent-red);
    cursor: pointer;
    border: 2px solid var(--neo-border);
}
.d3-parameter-group input[type="number"] { /* For min co-occurrence */
    width: calc(100% - 12px); /* Match other inputs in controls */
    padding: 8px;
    margin-bottom: 0;
    background-color: var(--neo-white);
    color: var(--neo-text);
    border: 2px solid var(--neo-border);
    border-radius: 0;
    box-sizing: border-box;
    font-family: var(--neo-font);
    font-size: 0.9em;
}
.d3-parameter-group input[type="number"]:disabled {
    background-color: #e9e9e9;
    color: #aaa;
    cursor: not-allowed;
    border-color: #ccc;
}


.d3-category-filters {
    margin-top: 20px;
}
.d3-category-filters h3 { 
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--neo-text);
    text-transform: uppercase;
    border-bottom: 2px solid var(--neo-border);
    padding-bottom: 5px;
}
#d3-category-filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 10px;
}
.d3-category-button { 
    padding: 6px 10px;
    background-color: var(--neo-white);
    border: 2px solid var(--neo-border);
    font-family: var(--neo-font);
    font-size: 11px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 2px 2px 0px var(--neo-border);
    transition: all 0.1s ease;
    text-transform: capitalize;
    color: var(--neo-text);
    width: auto; margin-bottom: 0; border-radius:0; 
}
.d3-category-button:hover {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0px var(--neo-border);
}
.d3-category-button.active {
    background-color: var(--neo-accent-red); /* Default active, will be overridden by JS */
    color: var(--neo-white);
}

.d3-reset-button, .d3-control-button { 
    display: block;
    width: 100%;
    margin-top: 15px;
    padding: 10px;
    background-color: var(--neo-text);
    color: var(--neo-white);
    border: 2px solid var(--neo-border);
    font-family: var(--neo-font);
    font-size: 14px;
    font-weight: bold;
    text-transform: uppercase;
    cursor: pointer;
    box-shadow: 3px 3px 0px #666;
    transition: all 0.1s ease;
    margin-bottom: 0; border-radius:0; 
}
.d3-reset-button:hover, .d3-control-button:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px #666;
}
.d3-reset-button:active, .d3-control-button:active {
    transform: translate(3px, 3px);
    box-shadow: none;
}
.d3-control-button:disabled {
    background-color: #aaa;
    color: #ddd;
    border-color: #888;
    cursor: not-allowed;
    box-shadow: none;
}


#d3-tag-network-graph {
    flex: 1;
    background-color: var(--neo-bg);
    height: 100%;
    width: 100%;
    cursor: grab;
}
#d3-tag-network-graph.grabbing {
    cursor: grabbing;
}

/* D3 Node and Link Styles for MAIN graph */
#d3-tag-network-graph .d3-link.d3-link-course-tag { 
    stroke: #555;
    stroke-opacity: 0.6;
}
#d3-tag-network-graph .d3-link.d3-link-tag-tag {
    stroke: var(--d3-link-tag-tag-color); /* Use variable for tag-tag links */
    stroke-opacity: 0.5;
    stroke-dasharray: 3,3; /* Optional: dashed line for tag-tag */
}

#d3-tag-network-graph .d3-node circle { 
    stroke: var(--neo-white);
    stroke-width: 1.5px;
    transition: r 0.2s ease-out;
}
#d3-tag-network-graph .d3-node.highlight circle { 
    stroke: var(--neo-text);
    stroke-width: 2.5px;
}
#d3-tag-network-graph .d3-node text { 
    font-family: var(--neo-font); 
    font-size: 9px;
    pointer-events: none;
    fill: var(--neo-text);
    text-anchor: middle;
    dominant-baseline: central;
    paint-order: stroke;
    stroke: var(--neo-bg);
    stroke-width: 2.5px;
    stroke-linecap: butt;
    stroke-linejoin: miter;
    transition: font-size 0.2s ease-out;
}
#d3-tag-network-graph .d3-node.highlight text { 
    font-weight: bold;
}

#d3-tag-network-graph .d3-node.dimmed { opacity: 0.15; pointer-events: none; }
#d3-tag-network-graph .d3-link.dimmed { opacity: 0.05; }
#d3-tag-network-graph .d3-node.search-match circle {
    stroke: var(--neo-accent-red);
    stroke-width: 3px;
}
#d3-tag-network-graph .d3-node.search-match text {
    font-weight: bold;
    fill: var(--neo-accent-red);
}


.d3-legend-panel {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background-color: var(--neo-white);
    padding: 12px 15px;
    border: 3px solid var(--neo-border);
    box-shadow: 4px 4px 0px rgba(0, 0, 0, 0.7);
    z-index: 10;
    font-family: var(--neo-font);
    max-height: 35vh;
    overflow-y: auto;
}
.d3-legend-panel h3 { 
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--neo-text);
    text-transform: uppercase;
    border-bottom: 2px solid var(--neo-border);
    padding-bottom: 5px;
}
.d3-legend-item {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: bold;
    text-transform: capitalize;
    color: var(--neo-text);
}
.d3-legend-color {
    display: inline-block;
    width: 14px;
    height: 14px;
    margin-right: 10px;
    border: 2px solid var(--neo-border);
}

.d3-popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 420px;
    max-width: 90%;
    background-color: var(--neo-white);
    border: 3px solid var(--neo-border);
    box-shadow: 6px 6px 0px rgba(0, 0, 0, 0.7);
    z-index: 1020;
    font-family: var(--neo-font);
}
.d3-popup.visible { display: block; }

.d3-popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background-color: var(--neo-text);
    color: var(--neo-white);
}
.d3-popup-header h2 { 
    margin: 0;
    font-size: 16px;
    text-transform: uppercase;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--neo-white);
    border-bottom: none; 
    padding-bottom: 0; 
}
.d3-close-button {
    font-size: 22px;
    color: var(--neo-white);
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    line-height: 1;
    font-weight: bold;
}
.d3-close-button:hover { color: var(--neo-accent-red); }

.d3-popup-content {
    padding: 15px 20px;
    max-height: 70vh; 
    overflow-y: auto;
    font-size: 13px;
    color: var(--neo-text);
}
.d3-popup-content p {
    margin: 0 0 10px 0;
    line-height: 1.5;
}
.d3-popup-content strong { font-weight: bold; }
.d3-popup-content pre {
    white-space: pre-wrap; word-wrap: break-word;
    background-color: #f8f8f8;
    padding: 10px;
    border: 1px solid #eee;
    font-size: 0.9em;
    max-height: 200px;
    overflow-y: auto;
    margin-top: 5px;
    margin-bottom: 10px;
    color: #333;
}
#d3-popup-connections h3 { 
    margin-top: 15px;
    margin-bottom: 8px;
    font-size: 14px;
    text-transform: uppercase;
    border-bottom: 2px solid var(--neo-border);
    padding-bottom: 4px;
    color: var(--neo-text);
}
#d3-connections-list {
    margin: 0;
    padding-left: 0;
    list-style: none;
}
#d3-connections-list li {
    margin-bottom: 6px;
    padding: 4px 0;
}
#d3-popup-details div { margin-bottom: 6px; }


.d3-info-button { 
    position: absolute;
    bottom: 20px;
    left: 20px;
    width: 36px;
    height: 36px;
    background-color: var(--neo-text);
    color: var(--neo-white);
    border: 2px solid var(--neo-border);
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 3px 3px 0px rgba(0, 0, 0, 0.5);
    transition: all 0.1s ease;
    z-index: 10;
    margin-top:0; margin-bottom: 0; border-radius:0; text-transform: none;
}
.d3-info-button:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.5);
}
.d3-info-button:active {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0px rgba(0,0,0,0.5);
}

.d3-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75);
    z-index: 1015;
    font-family: var(--neo-font);
}
.d3-modal-overlay.visible { display: flex; align-items: center; justify-content: center; }

.d3-info-modal-content {
    width: 550px;
    max-width: 90%;
    max-height: 85vh;
    background-color: var(--neo-white);
    border: 3px solid var(--neo-border);
    box-shadow: 8px 8px 0px rgba(0, 0, 0, 0.7);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    font-family: var(--neo-font);
}
.d3-info-modal-content .d3-modal-header {
    padding: 12px 15px;
    background-color: var(--neo-text);
    color: var(--neo-white);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}
.d3-info-modal-content .d3-modal-header h2 { 
    margin: 0;
    font-size: 16px;
    text-transform: uppercase;
    color: var(--neo-white);
    border-bottom: none; 
    padding-bottom: 0; 
}
.d3-info-modal-content .d3-modal-body {
    padding: 20px 25px;
    line-height: 1.6;
    overflow-y: auto;
    font-size: 13px;
    flex-grow: 1;
    color: var(--neo-text);
}
.d3-info-modal-content .d3-modal-body h3 { 
    margin-top: 15px;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--neo-text);
    text-transform: uppercase;
    border-bottom: 2px solid var(--neo-border);
    padding-bottom: 5px;
}
.d3-info-modal-content .d3-modal-body ul {
    padding-left: 20px;
    margin-bottom: 15px;
}
.d3-info-modal-content .d3-modal-body li {
    margin-bottom: 8px;
}

/* Neighbor Visualization Styles */
#neighbor-vis-svg-container {
    cursor: grab; /* For network layout panning */
}
#neighbor-vis-svg-container.grabbing {
    cursor: grabbing;
}

#neighbor-vis-svg-container svg text {
    font-family: var(--d3-font); 
    fill: var(--neo-text);
    text-anchor: middle;
    dominant-baseline: central;
    paint-order: stroke;
    stroke: var(--neo-bg); 
    stroke-width: 2.5px; 
    stroke-linecap: butt;
    stroke-linejoin: miter;
    pointer-events: none; 
}

#neighbor-vis-svg-container svg circle {
     transition: r 0.1s ease-out; 
}

/* Styles for the new checkbox in neighbor vis modal controls */
#neighbor-vis-controls input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
    appearance: none;
    -webkit-appearance: none;
    background-color: var(--neo-white);
    border: 2px solid var(--neo-border);
    position: relative;
    cursor: pointer;
    vertical-align: middle; /* Align with label */
}
#neighbor-vis-controls input[type="checkbox"]:checked {
    background-color: var(--neo-text);
}
#neighbor-vis-controls input[type="checkbox"]:checked::after {
    content: '✔';
    font-size: 12px;
    color: var(--neo-white);
    position: absolute;
    left: 2px;
    top: -1px;
}
#neighbor-vis-controls label[for="neighbor-vis-network-layout-toggle"] {
    font-weight: normal;
    text-transform: none;
    font-size: 0.9em;
    cursor: pointer;
    vertical-align: middle; /* Align with checkbox */
}

/* Styles for neighbor vis modal filters */
.neighbor-vis-filters-section {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #ddd; /* Light separator */
}

#neighbor-vis-filter-buttons-container .d3-category-button { /* Re-use existing class for consistency */
    padding: 5px 8px;
    font-size: 10px; /* Slightly smaller */
}

#neighbor-vis-reset-filters-button {
    background-color: var(--neo-text) !important; 
    color: var(--neo-white) !important;
    border: 2px solid var(--neo-border) !important;
    box-shadow: 2px 2px 0px #666 !important;
}
#neighbor-vis-reset-filters-button:hover {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0px #666 !important;
}
 #neighbor-vis-reset-filters-button:active {
    transform: translate(2px, 2px);
    box-shadow: none !important;
}


/* Network Metrics Table Modal Styles */
#metrics-table-container table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85em; 
}
#metrics-table-container th,
#metrics-table-container td {
    border: 1px solid var(--neo-border);
    padding: 8px 10px;
    text-align: left;
    word-break: break-word;
}
#metrics-table-container th {
    background-color: var(--neo-text);
    color: var(--neo-white);
    position: sticky;
    top: 0;
    z-index: 1; 
    cursor: pointer;
    text-transform: uppercase;
}
#metrics-table-container th:hover {
    background-color: #333;
}
#metrics-table-container th .sort-arrow {
    margin-left: 5px;
    font-size: 0.8em;
}
#metrics-table-container tr:nth-child(even) { background-color: #e0e0e0; }
#metrics-table-container tr:nth-child(odd) { background-color: var(--neo-bg); }