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linxy
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RamseyGraph

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Graph Machine Learning
Languages:
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🎉 [add index.html] Update Ramsey(5,5) challenge with dynamic year calculation
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<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Ramsey Graph Visualizer</title>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/7.8.5/d3.min.js"></script>
 <link rel="preconnect" href="https://fonts.googleapis.com">
 <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
 <link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Fraunces:opsz,wght@9..144,300;9..144,600&display=swap" rel="stylesheet">
 <style>
 :root {
 --bg-primary: #0a0a0a;
 --bg-secondary: #1a1a1a;
 --border-color: #2a2a2a;
 --text-primary: #e8e8e8;
 --text-secondary: #888888;
 --accent-red: #ff3366;
 --accent-blue: #00d4ff;
 --accent-green: #00ff88;
 --mono: 'JetBrains Mono', monospace;
 --serif: 'Fraunces', serif;
 }
 * { margin: 0; padding: 0; box-sizing: border-box; }
 html, body {
 height: 100%;
 overflow: hidden;
 }
 body {
 background: var(--bg-primary);
 color: var(--text-primary);
 font-family: var(--mono);
 font-size: 13px;
 display: flex;
 flex-direction: column;
 }
 body::before {
 content: '';
 position: fixed;
 top: 0; left: 0;
 width: 100%; height: 100%;
 background-image:
 linear-gradient(rgba(255, 51, 102, 0.03) 1px, transparent 1px),
 linear-gradient(90deg, rgba(255, 51, 102, 0.03) 1px, transparent 1px);
 background-size: 40px 40px;
 pointer-events: none;
 z-index: 0;
 animation: gridPulse 8s ease-in-out infinite;
 }
 @keyframes gridPulse {
 0%, 100% { opacity: 0.3; }
 50% { opacity: 0.6; }
 }
 .app {
 position: relative;
 z-index: 1;
 display: flex;
 flex-direction: column;
 height: 100vh;
 padding: 16px 24px;
 gap: 12px;
 }
 header {
 display: flex;
 justify-content: space-between;
 align-items: center;
 padding-bottom: 12px;
 border-bottom: 1px solid var(--border-color);
 flex-shrink: 0;
 }
 .title-area {
 display: flex;
 align-items: baseline;
 gap: 16px;
 }
 h1 {
 font-family: var(--serif);
 font-size: 28px;
 font-weight: 600;
 background: linear-gradient(135deg, var(--text-primary), var(--accent-red));
 -webkit-background-clip: text;
 -webkit-text-fill-color: transparent;
 background-clip: text;
 }
 .subtitle {
 font-size: 11px;
 color: var(--text-secondary);
 text-transform: uppercase;
 letter-spacing: 0.1em;
 }
 .header-actions {
 display: flex;
 align-items: center;
 gap: 12px;
 }
 .action-btn {
 display: flex;
 align-items: center;
 gap: 6px;
 padding: 8px 14px;
 font-size: 12px;
 border: 1px solid var(--border-color);
 background: transparent;
 color: var(--text-secondary);
 cursor: pointer;
 font-family: var(--mono);
 transition: all 0.2s ease;
 }
 .action-btn:hover {
 border-color: var(--accent-green);
 color: var(--accent-green);
 }
 .btn-icon {
 width: 16px;
 height: 16px;
 flex-shrink: 0;
 }
 .lang-toggle {
 display: flex;
 gap: 4px;
 }
 .lang-btn {
 display: flex;
 align-items: center;
 gap: 6px;
 padding: 6px 12px;
 font-size: 12px;
 border: 1px solid var(--border-color);
 background: transparent;
 color: var(--text-secondary);
 cursor: pointer;
 font-family: var(--mono);
 transition: all 0.2s ease;
 }
 .lang-icon {
 width: 14px;
 height: 14px;
 flex-shrink: 0;
 }
 .lang-btn.active {
 border-color: var(--accent-blue);
 background: var(--accent-blue);
 color: var(--bg-primary);
 }
 .lang-btn:hover:not(.active) {
 border-color: var(--accent-blue);
 color: var(--accent-blue);
 }
 .main-content {
 display: flex;
 gap: 16px;
 flex: 1;
 min-height: 0;
 }
 .sidebar {
 width: 280px;
 flex-shrink: 0;
 display: flex;
 flex-direction: column;
 gap: 12px;
 }
 .panel {
 background: var(--bg-secondary);
 border: 1px solid var(--border-color);
 padding: 16px;
 }
 .panel-title {
 font-size: 10px;
 text-transform: uppercase;
 letter-spacing: 0.15em;
 color: var(--text-secondary);
 margin-bottom: 12px;
 display: flex;
 align-items: center;
 gap: 8px;
 }
 .panel-title::before {
 content: '';
 width: 8px;
 height: 8px;
 background: var(--accent-red);
 }
 .selector-grid {
 display: grid;
 grid-template-columns: 1fr 1fr 1fr;
 gap: 8px;
 margin-bottom: 12px;
 }
 .selector-item label {
 display: block;
 font-size: 10px;
 color: var(--text-secondary);
 margin-bottom: 4px;
 text-transform: uppercase;
 letter-spacing: 0.1em;
 }
 select {
 width: 100%;
 background: var(--bg-primary);
 border: 1px solid var(--border-color);
 color: var(--text-primary);
 padding: 8px;
 font-family: var(--mono);
 font-size: 13px;
 cursor: pointer;
 }
 select:focus {
 outline: none;
 border-color: var(--accent-red);
 }
 select:disabled {
 opacity: 0.5;
 cursor: not-allowed;
 }
 .btn {
 width: 100%;
 padding: 10px;
 font-family: var(--mono);
 font-size: 11px;
 text-transform: uppercase;
 letter-spacing: 0.1em;
 border: 1px solid var(--border-color);
 background: var(--bg-primary);
 color: var(--text-primary);
 cursor: pointer;
 transition: all 0.2s ease;
 }
 .btn:hover:not(:disabled) {
 border-color: var(--accent-red);
 background: var(--accent-red);
 color: var(--bg-primary);
 }
 .btn:disabled {
 opacity: 0.4;
 cursor: not-allowed;
 }
 .btn-primary {
 border-color: var(--accent-red);
 background: rgba(255, 51, 102, 0.1);
 }
 .input-row {
 display: flex;
 gap: 8px;
 margin-bottom: 8px;
 }
 input[type="text"] {
 flex: 1;
 background: var(--bg-primary);
 border: 1px solid var(--border-color);
 color: var(--text-primary);
 padding: 8px 10px;
 font-family: var(--mono);
 font-size: 12px;
 }
 input[type="text"]:focus {
 outline: none;
 border-color: var(--accent-red);
 }
 input[type="file"] {
 display: none;
 }
 .file-label {
 display: block;
 padding: 10px;
 text-align: center;
 border: 1px dashed var(--border-color);
 color: var(--text-secondary);
 cursor: pointer;
 font-size: 11px;
 transition: all 0.2s ease;
 }
 .file-label:hover {
 border-color: var(--accent-red);
 color: var(--accent-red);
 }
 .file-label.has-file {
 border-style: solid;
 border-color: var(--accent-green);
 color: var(--accent-green);
 }
 .divider {
 text-align: center;
 color: var(--text-secondary);
 font-size: 10px;
 margin: 8px 0;
 position: relative;
 }
 .divider::before, .divider::after {
 content: '';
 position: absolute;
 top: 50%;
 width: 40%;
 height: 1px;
 background: var(--border-color);
 }
 .divider::before { left: 0; }
 .divider::after { right: 0; }
 .status {
 padding: 8px 10px;
 font-size: 11px;
 border-left: 3px solid var(--accent-blue);
 background: rgba(0, 212, 255, 0.05);
 display: none;
 }
 .status.show { display: block; }
 .status.error {
 border-color: var(--accent-red);
 background: rgba(255, 51, 102, 0.05);
 color: var(--accent-red);
 }
 .status.success {
 border-color: var(--accent-green);
 background: rgba(0, 255, 136, 0.05);
 color: var(--accent-green);
 }
 .canvas-area {
 flex: 1;
 display: flex;
 flex-direction: column;
 background: var(--bg-secondary);
 border: 1px solid var(--border-color);
 min-width: 0;
 }
 .canvas-header {
 display: flex;
 justify-content: space-between;
 align-items: center;
 padding: 12px 16px;
 border-bottom: 1px solid var(--border-color);
 flex-shrink: 0;
 flex-wrap: wrap;
 gap: 12px;
 }
 .header-left {
 display: flex;
 align-items: center;
 gap: 20px;
 }
 .header-right {
 display: flex;
 align-items: center;
 gap: 16px;
 }
 .graph-info {
 display: flex;
 gap: 20px;
 }
 .info-item {
 text-align: center;
 }
 .info-value {
 font-size: 18px;
 font-weight: 700;
 color: var(--accent-red);
 }
 .info-label {
 font-size: 9px;
 text-transform: uppercase;
 letter-spacing: 0.1em;
 color: var(--text-secondary);
 }
 .toggle-group {
 display: flex;
 gap: 4px;
 }
 .toggle-btn {
 padding: 6px 12px;
 font-size: 10px;
 text-transform: uppercase;
 border: 1px solid var(--border-color);
 background: transparent;
 color: var(--text-secondary);
 cursor: pointer;
 font-family: var(--mono);
 }
 .toggle-btn.active {
 border-color: var(--accent-red);
 background: var(--accent-red);
 color: var(--bg-primary);
 }
 .toggle-btn:hover:not(.active) {
 border-color: var(--accent-red);
 color: var(--accent-red);
 }
 #canvas {
 flex: 1;
 position: relative;
 overflow: hidden;
 }
 #canvas svg {
 width: 100%;
 height: 100%;
 }
 .empty-state {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
 text-align: center;
 color: var(--text-secondary);
 }
 .empty-icon {
 font-size: 48px;
 opacity: 0.3;
 margin-bottom: 8px;
 font-family: var(--serif);
 }
 .pagination {
 display: flex;
 align-items: center;
 justify-content: center;
 gap: 8px;
 padding: 10px;
 border-top: 1px solid var(--border-color);
 flex-shrink: 0;
 }
 .pagination button {
 padding: 6px 12px;
 font-family: var(--mono);
 font-size: 11px;
 border: 1px solid var(--border-color);
 background: transparent;
 color: var(--text-secondary);
 cursor: pointer;
 }
 .pagination button:hover:not(:disabled) {
 border-color: var(--accent-red);
 color: var(--accent-red);
 }
 .pagination button:disabled {
 opacity: 0.3;
 cursor: not-allowed;
 }
 .page-info {
 min-width: 100px;
 text-align: center;
 color: var(--text-secondary);
 font-size: 12px;
 }
 .page-info span {
 color: var(--accent-red);
 font-weight: 700;
 }
 .node { cursor: pointer; }
 .node:hover { filter: brightness(1.3); }
 .link { stroke-opacity: 0.6; }
 .node-label {
 font-family: var(--mono);
 font-size: 10px;
 fill: var(--text-primary);
 text-anchor: middle;
 pointer-events: none;
 }
 .legend {
 display: flex;
 gap: 16px;
 font-size: 10px;
 color: var(--text-secondary);
 }
 .legend-item {
 display: flex;
 align-items: center;
 gap: 6px;
 }
 .legend-dot {
 width: 10px;
 height: 10px;
 border-radius: 50%;
 }
 .legend-dot.red { background: var(--accent-red); }
 .legend-dot.blue { background: var(--accent-blue); }
 .loading {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
 color: var(--text-secondary);
 }
 .loading::after {
 content: '';
 display: inline-block;
 width: 16px;
 height: 16px;
 border: 2px solid var(--border-color);
 border-top-color: var(--accent-red);
 border-radius: 50%;
 animation: spin 0.8s linear infinite;
 margin-left: 8px;
 vertical-align: middle;
 }
 @keyframes spin {
 to { transform: rotate(360deg); }
 }
 /* Matrix styles */
 .matrix-container {
 position: absolute;
 top: 0;
 left: 0;
 right: 0;
 bottom: 0;
 display: flex;
 align-items: center;
 justify-content: center;
 overflow: auto;
 padding: 20px;
 }
 .matrix-wrapper {
 display: flex;
 flex-direction: column;
 align-items: center;
 }
 .matrix-labels-top {
 display: flex;
 margin-left: 30px;
 }
 .matrix-label {
 width: var(--cell-size, 24px);
 height: 20px;
 display: flex;
 align-items: center;
 justify-content: center;
 font-size: 10px;
 color: var(--text-secondary);
 }
 .matrix-row {
 display: flex;
 align-items: center;
 }
 .matrix-row-label {
 width: 30px;
 height: var(--cell-size, 24px);
 display: flex;
 align-items: center;
 justify-content: center;
 font-size: 10px;
 color: var(--text-secondary);
 }
 .matrix-cell {
 width: var(--cell-size, 24px);
 height: var(--cell-size, 24px);
 border: 1px solid var(--border-color);
 display: flex;
 align-items: center;
 justify-content: center;
 font-size: 10px;
 transition: all 0.15s ease;
 }
 .matrix-cell.edge {
 background: var(--accent-red);
 color: var(--bg-primary);
 font-weight: 700;
 }
 .matrix-cell.complement {
 background: var(--accent-blue);
 color: var(--bg-primary);
 font-weight: 700;
 }
 .matrix-cell.diagonal {
 background: var(--bg-primary);
 color: var(--text-secondary);
 }
 .matrix-cell.empty {
 background: transparent;
 color: var(--text-secondary);
 }
 .matrix-cell:hover:not(.diagonal) {
 transform: scale(1.1);
 z-index: 10;
 box-shadow: 0 0 10px rgba(255, 51, 102, 0.5);
 }
 /* Modal styles */
 .modal {
 display: none;
 position: fixed;
 top: 0;
 left: 0;
 right: 0;
 bottom: 0;
 z-index: 1000;
 align-items: center;
 justify-content: center;
 }
 .modal.show {
 display: flex;
 }
 .modal-overlay {
 position: absolute;
 top: 0;
 left: 0;
 right: 0;
 bottom: 0;
 background: rgba(0, 0, 0, 0.8);
 }
 .modal-content {
 position: relative;
 background: var(--bg-secondary);
 border: 1px solid var(--border-color);
 max-width: 600px;
 max-height: 80vh;
 width: 90%;
 display: flex;
 flex-direction: column;
 }
 .modal-content.modal-large {
 max-width: 900px;
 }
 .modal-header {
 display: flex;
 justify-content: space-between;
 align-items: center;
 padding: 16px 20px;
 border-bottom: 1px solid var(--border-color);
 }
 .modal-header h2 {
 font-family: var(--serif);
 font-size: 20px;
 font-weight: 600;
 color: var(--text-primary);
 }
 .modal-close {
 width: 32px;
 height: 32px;
 display: flex;
 align-items: center;
 justify-content: center;
 border: 1px solid var(--border-color);
 background: transparent;
 color: var(--text-secondary);
 font-size: 20px;
 cursor: pointer;
 transition: all 0.2s ease;
 }
 .modal-close:hover {
 border-color: var(--accent-red);
 color: var(--accent-red);
 }
 .modal-body {
 padding: 20px;
 overflow-y: auto;
 font-size: 13px;
 line-height: 1.7;
 color: var(--text-secondary);
 }
 .modal-body p {
 margin-bottom: 12px;
 }
 .modal-body strong {
 color: var(--text-primary);
 }
 .modal-body .highlight {
 color: var(--accent-red);
 font-weight: 700;
 }
 .modal-body .challenge {
 padding: 16px;
 margin: 16px 0;
 background: rgba(255, 51, 102, 0.1);
 border-left: 3px solid var(--accent-red);
 }
 .modal-body .significance {
 padding: 16px;
 margin: 16px 0;
 background: rgba(0, 212, 255, 0.1);
 border-left: 3px solid var(--accent-blue);
 }
 /* Progress table */
 .ramsey-table {
 width: 100%;
 border-collapse: collapse;
 font-size: 11px;
 margin-top: 12px;
 }
 .ramsey-table th,
 .ramsey-table td {
 padding: 8px 6px;
 border: 1px solid var(--border-color);
 text-align: center;
 }
 .ramsey-table th {
 background: var(--bg-primary);
 color: var(--accent-red);
 font-weight: 700;
 }
 .ramsey-table td.exact {
 background: rgba(0, 255, 136, 0.1);
 color: var(--accent-green);
 }
 .ramsey-table td.range {
 background: rgba(0, 212, 255, 0.1);
 color: var(--accent-blue);
 }
 .ramsey-table td.trivial {
 color: var(--text-secondary);
 }
 .table-legend {
 display: flex;
 gap: 20px;
 margin-top: 16px;
 font-size: 11px;
 }
 .table-legend-item {
 display: flex;
 align-items: center;
 gap: 8px;
 }
 .legend-box {
 width: 16px;
 height: 16px;
 }
 .legend-box.exact {
 background: rgba(0, 255, 136, 0.1);
 border: 1px solid var(--accent-green);
 }
 .legend-box.range {
 background: rgba(0, 212, 255, 0.1);
 border: 1px solid var(--accent-blue);
 }
 /* Links panel */
 .panel-links {
 margin-top: auto;
 }
 .link-list {
 display: flex;
 flex-direction: column;
 gap: 6px;
 }
 .link-list a {
 display: flex;
 align-items: center;
 gap: 10px;
 padding: 8px 10px;
 background: var(--bg-primary);
 border: 1px solid var(--border-color);
 color: var(--text-secondary);
 text-decoration: none;
 font-size: 11px;
 transition: all 0.2s ease;
 }
 .link-list a:hover {
 border-color: var(--accent-red);
 color: var(--text-primary);
 }
 .link-icon {
 width: 28px;
 height: 28px;
 display: flex;
 align-items: center;
 justify-content: center;
 background: var(--border-color);
 color: var(--text-primary);
 flex-shrink: 0;
 padding: 5px;
 }
 .link-icon svg {
 width: 100%;
 height: 100%;
 }
 .link-list a:hover .link-icon {
 background: var(--accent-red);
 color: var(--bg-primary);
 }
 .link-text {
 overflow: hidden;
 text-overflow: ellipsis;
 white-space: nowrap;
 }
 @media (max-width: 900px) {
 .main-content {
 flex-direction: column;
 }
 .sidebar {
 width: 100%;
 flex-direction: row;
 flex-wrap: wrap;
 }
 .sidebar .panel {
 flex: 1;
 min-width: 200px;
 }
 .panel-links {
 margin-top: 0;
 }
 .canvas-header {
 flex-direction: column;
 align-items: flex-start;
 }
 }
 </style>
</head>
<body>
 <div class="app">
 <header>
 <div class="title-area">
 <h1>Ramsey Graph</h1>
 <span class="subtitle" data-i18n="subtitle">Interactive Visualizer</span>
 </div>
 <div class="header-actions">
 <button class="action-btn" id="introBtn">
 <svg class="btn-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
 <path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"></path>
 <path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"></path>
 </svg>
 <span data-i18n="introduction">Introduction</span>
 </button>
 <button class="action-btn" id="progressBtn">
 <svg class="btn-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
 <path d="M18 20V10"></path>
 <path d="M12 20V4"></path>
 <path d="M6 20v-6"></path>
 </svg>
 <span data-i18n="progress">Progress</span>
 </button>
 <div class="lang-toggle">
 <button class="lang-btn active" data-lang="en">
 <svg class="lang-icon" viewBox="0 0 24 24" fill="currentColor">
 <circle cx="12" cy="12" r="10" fill="none" stroke="currentColor" stroke-width="1.5"/>
 <path d="M2 12h20M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z" fill="none" stroke="currentColor" stroke-width="1.5"/>
 </svg>
 EN
 </button>
 <button class="lang-btn" data-lang="zh">
 <svg class="lang-icon" viewBox="0 0 24 24" fill="currentColor">
 <circle cx="12" cy="12" r="10" fill="none" stroke="currentColor" stroke-width="1.5"/>
 <path d="M2 12h20M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z" fill="none" stroke="currentColor" stroke-width="1.5"/>
 </svg>
 中文
 </button>
 </div>
 </div>
 </header>
<div class="main-content">
 <div class="sidebar">
 <div class="panel">
 <div class="panel-title" data-i18n="selectDataset">Select Dataset</div>
 <div class="selector-grid">
 <div class="selector-item">
 <label>s</label>
 <select id="selectS"></select>
 </div>
 <div class="selector-item">
 <label>t</label>
 <select id="selectT"></select>
 </div>
 <div class="selector-item">
 <label>n</label>
 <select id="selectN"></select>
 </div>
 </div>
 <button class="btn btn-primary" id="loadDatasetBtn" data-i18n="loadDataset">Load Ramsey(s,t,n)</button>
 <div id="datasetInfo" style="margin-top: 8px; font-size: 10px; color: var(--text-secondary);"></div>
 </div>
<div class="panel">
 <div class="panel-title" data-i18n="customSource">Custom Source</div>
 <div class="input-row">
 <input type="text" id="urlInput" data-i18n-placeholder="urlPlaceholder" placeholder="Enter .g6 file URL...">
 </div>
 <button class="btn" id="loadUrlBtn" data-i18n="loadUrl">Load URL</button>
 <div class="divider" data-i18n="or">or</div>
 <input type="file" id="fileInput" accept=".g6">
 <label class="file-label" id="fileLabel" for="fileInput" data-i18n="uploadFile">
 Drop or click to upload .g6 file
 </label>
 </div>
<div id="status" class="status"></div>
<div class="panel panel-links">
 <div class="panel-title" data-i18n="links">Links</div>
 <div class="link-list">
 <a href="https://huggingface.co/datasets/linxy/RamseyGraph" target="_blank">
 <span class="link-icon">
 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
 <path d="M21 16V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.73l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z"></path>
 <polyline points="3.27 6.96 12 12.01 20.73 6.96"></polyline>
 <line x1="12" y1="22.08" x2="12" y2="12"></line>
 </svg>
 </span>
 <span class="link-text" data-i18n="hfDataset">HuggingFace Dataset</span>
 </a>
 <a href="https://github.com/LinXueyuanStdio/RamseyGraph" target="_blank">
 <span class="link-icon">
 <svg viewBox="0 0 24 24" fill="currentColor">
 <path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z"/>
 </svg>
 </span>
 <span class="link-text" data-i18n="ghRepo">GitHub Repository</span>
 </a>
 <a href="https://users.cecs.anu.edu.au/~bdm/data/ramsey.html" target="_blank">
 <span class="link-icon">
 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
 <ellipse cx="12" cy="5" rx="9" ry="3"></ellipse>
 <path d="M21 12c0 1.66-4 3-9 3s-9-1.34-9-3"></path>
 <path d="M3 5v14c0 1.66 4 3 9 3s9-1.34 9-3V5"></path>
 </svg>
 </span>
 <span class="link-text" data-i18n="originDb">Origin Database</span>
 </a>
 <a href="mailto:linxy59@mail2.sysu.edu.cn">
 <span class="link-icon">
 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
 <path d="M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z"></path>
 <polyline points="22,6 12,13 2,6"></polyline>
 </svg>
 </span>
 <span class="link-text" data-i18n="contact">Contact</span>
 </a>
 <a href="https://www.combinatorics.org" target="_blank">
 <span class="link-icon">
 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
 <path d="M2 3h6a4 4 0 0 1 4 4v14a3 3 0 0 0-3-3H2z"></path>
 <path d="M22 3h-6a4 4 0 0 0-4 4v14a3 3 0 0 1 3-3h7z"></path>
 </svg>
 </span>
 <span class="link-text" data-i18n="wiki">E-JC Survey</span>
 </a>
 <a href="https://en.wikipedia.org/wiki/Ramsey%27s_theorem" target="_blank" id="wikiLink">
 <span class="link-icon">
 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
 <circle cx="12" cy="12" r="10"></circle>
 <path d="M12 16v-4"></path>
 <path d="M12 8h.01"></path>
 </svg>
 </span>
 <span class="link-text" data-i18n="wikiLink">Wikipedia</span>
 </a>
 </div>
 </div>
 </div>
<div class="canvas-area">
 <div class="canvas-header">
 <div class="header-left">
 <div class="graph-info">
 <div class="info-item">
 <div class="info-value" id="nodeCount">-</div>
 <div class="info-label" data-i18n="nodes">Nodes</div>
 </div>
 <div class="info-item">
 <div class="info-value" id="edgeCount">-</div>
 <div class="info-label" data-i18n="edges">Edges</div>
 </div>
 </div>
 <div class="legend">
 <div class="legend-item"><div class="legend-dot red"></div><span data-i18n="graphG">Graph G</span></div>
 <div class="legend-item"><div class="legend-dot blue"></div><span data-i18n="complement">Complement</span></div>
 </div>
 </div>
 <div class="header-right">
 <div class="toggle-group" id="displayToggle">
 <button class="toggle-btn active" data-display="force" data-i18n="force">Force</button>
 <button class="toggle-btn" data-display="matrix" data-i18n="matrix">Matrix</button>
 </div>
 <div class="toggle-group" id="viewToggle">
 <button class="toggle-btn active" data-mode="graph">G</button>
 <button class="toggle-btn" data-mode="complement">G'</button>
 <button class="toggle-btn" data-mode="both" data-i18n="both">Both</button>
 </div>
 </div>
 </div>
 <div id="canvas">
 <div class="empty-state">
 <div class="empty-icon">R</div>
 <div data-i18n="emptyState">Select a dataset or upload a file</div>
 </div>
 </div>
 <div class="pagination" id="pagination" style="display: none;">
 <button id="prevBtn" data-i18n="prev">&lt; Prev</button>
 <div class="page-info">
 <span data-i18n="graph">Graph</span> <span id="currentPage">1</span> / <span id="totalPages">1</span>
 </div>
 <button id="nextBtn" data-i18n="next">Next &gt;</button>
 </div>
 </div>
 </div>
<!-- Introduction Modal -->
 <div class="modal" id="introModal">
 <div class="modal-overlay"></div>
 <div class="modal-content">
 <div class="modal-header">
 <h2 data-i18n="introTitle">What is a Ramsey Graph?</h2>
 <button class="modal-close">&times;</button>
 </div>
 <div class="modal-body" id="introBody">
 </div>
 </div>
 </div>
<!-- Progress Modal -->
 <div class="modal" id="progressModal">
 <div class="modal-overlay"></div>
 <div class="modal-content modal-large">
 <div class="modal-header">
 <h2 data-i18n="progressTitle">Known Ramsey Numbers</h2>
 <button class="modal-close">&times;</button>
 </div>
 <div class="modal-body" id="progressBody">
 </div>
 </div>
 </div>
</div>
<script>
 // i18n translations
 const i18n = {
 en: {
 subtitle: 'Interactive Visualizer',
 selectDataset: 'Select Dataset',
 loadDataset: 'Load Ramsey(s,t,n)',
 customSource: 'Custom Source',
 urlPlaceholder: 'Enter .g6 file URL...',
 loadUrl: 'Load URL',
 or: 'or',
 uploadFile: 'Drop or click to upload .g6 file',
 links: 'Links',
 hfDataset: 'HuggingFace Dataset',
 ghRepo: 'GitHub Repository',
 originDb: 'Origin Database',
 contact: 'Contact',
 wiki: 'E-JC Survey',
 nodes: 'Nodes',
 edges: 'Edges',
 graphG: 'Graph G',
 complement: 'Complement',
 force: 'Force',
 matrix: 'Matrix',
 both: 'Both',
 emptyState: 'Select a dataset or upload a file',
 prev: '< Prev',
 next: 'Next >',
 graph: 'Graph',
 loading: 'Loading',
 loadedGraphs: 'Loaded {0} graph(s)',
 noValidGraphs: 'No valid graphs found',
 errorLoading: 'Error: {0}',
 failedToLoad: 'Failed to load',
 graphCount: '{0} graph(s)',
 compressed: '(compressed)',
 introduction: 'Introduction',
 progress: 'Progress',
 introTitle: 'What is a Ramsey Graph?',
 progressTitle: 'Known Ramsey Numbers',
 exactValue: 'Exact value known',
 rangeValue: 'Only bounds known',
 wikiLink: 'Wikipedia'
 },
 zh: {
 subtitle: '交互式可视化工具',
 selectDataset: '选择数据集',
 loadDataset: '加载 Ramsey(s,t,n)',
 customSource: '自定义来源',
 urlPlaceholder: '输入 .g6 文件 URL...',
 loadUrl: '加载 URL',
 or: '或',
 uploadFile: '拖放或点击上传 .g6 文件',
 links: '链接',
 hfDataset: 'HuggingFace 数据集',
 ghRepo: 'GitHub 仓库',
 originDb: '原始数据库',
 contact: '联系方式',
 wiki: '电子组合学期刊',
 nodes: '节点',
 edges: '边',
 graphG: '图 G',
 complement: '补图',
 force: '力导向',
 matrix: '矩阵',
 both: '两者',
 emptyState: '选择数据集或上传文件',
 prev: '< 上一个',
 next: '下一个 >',
 graph: '图',
 loading: '加载中',
 loadedGraphs: '已加载 {0} 个图',
 noValidGraphs: '未找到有效的图',
 errorLoading: '错误: {0}',
 failedToLoad: '加载失败',
 graphCount: '{0} 个图',
 compressed: '(压缩)',
 introduction: '介绍',
 progress: '进展',
 introTitle: '什么是拉姆齐图？',
 progressTitle: '已知拉姆齐数',
 exactValue: '精确值已知',
 rangeValue: '仅知道上下界',
 wikiLink: '维基百科'
 }
 };
 const wikiUrls = {
 en: 'https://en.wikipedia.org/wiki/Ramsey%27s_theorem',
 zh: 'https://zh.wikipedia.org/wiki/%E6%8B%89%E5%A7%86%E9%BD%90%E5%AE%9A%E7%90%86'
 };
 let currentLang = localStorage.getItem('lang') || 'en';
 function t(key, ...args) {
 let text = i18n[currentLang][key] || i18n['en'][key] || key;
 args.forEach((arg, i) => {
 text = text.replace(`{${i}}`, arg);
 });
 return text;
 }
 function applyLanguage() {
 document.querySelectorAll('[data-i18n]').forEach(el => {
 const key = el.getAttribute('data-i18n');
 el.textContent = t(key);
 });
 document.querySelectorAll('[data-i18n-placeholder]').forEach(el => {
 const key = el.getAttribute('data-i18n-placeholder');
 el.placeholder = t(key);
 });
 // Update wiki link URL based on language
 const wikiLink = document.getElementById('wikiLink');
 if (wikiLink) {
 wikiLink.href = wikiUrls[currentLang] || wikiUrls.en;
 }
 // Update dataset info if loaded
 if (selectS.value) updateDatasetInfo();
 }
 function setLanguage(lang) {
 currentLang = lang;
 localStorage.setItem('lang', lang);
 document.querySelectorAll('.lang-btn').forEach(btn => {
 btn.classList.toggle('active', btn.dataset.lang === lang);
 });
 applyLanguage();
 }
 // Dataset configuration based on data/ folder
 const DATASETS = {
 '3,4': [1,2,3,4,5,6,7,8],
 '3,5': [1,2,3,4,5,6,7,8,9,10,11,12,13],
 '3,6': [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17],
 '3,7': [21,22],
 '3,8': [27],
 '3,9': [35],
 '4,4': [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17],
 '4,5': [24],
 '4,6': [35],
 '5,5': [42]
 };
 // Files that are compressed (gzipped)
 const COMPRESSED = new Set([
 'r36_11', 'r36_12', 'r36_13', 'r36_14', 'r36_15', 'r36_16',
 'r37_21', 'r38_27',
 'r44_10', 'r44_11', 'r44_12', 'r44_13', 'r44_14'
 ]);
 // Approximate graph counts for info display
 const GRAPH_COUNTS = {
 'r34_1':1,'r34_2':2,'r34_3':3,'r34_4':6,'r34_5':9,'r34_6':15,'r34_7':9,'r34_8':3,
 'r35_1':1,'r35_2':2,'r35_3':3,'r35_4':7,'r35_5':13,'r35_6':32,'r35_7':71,'r35_8':179,'r35_9':290,'r35_10':313,'r35_11':105,'r35_12':12,'r35_13':1,
 'r36_1':1,'r36_2':2,'r36_3':3,'r36_4':7,'r36_5':14,'r36_6':37,'r36_7':100,'r36_8':356,'r36_9':1407,'r36_10':6657,'r36_11':30395,'r36_12':116792,'r36_13':275086,'r36_14':263520,'r36_15':64732,'r36_16':2576,'r36_17':7,
 'r37_21':1118436,'r37_22':191,
 'r38_27':477142,
 'r39_35':1,
 'r44_1':1,'r44_2':2,'r44_3':4,'r44_4':9,'r44_5':24,'r44_6':84,'r44_7':362,'r44_8':2079,'r44_9':14701,'r44_10':103706,'r44_11':546356,'r44_12':1449166,'r44_13':1184231,'r44_14':130816,'r44_15':640,'r44_16':2,'r44_17':1,
 'r45_24':352366,
 'r46_35some':37,
 'r55_42some':328
 };
 // State
 let graphs = [];
 let currentIndex = 0;
 let viewMode = 'graph';
 let displayMode = 'force';
 let simulation = null;
 // DOM
 const selectS = document.getElementById('selectS');
 const selectT = document.getElementById('selectT');
 const selectN = document.getElementById('selectN');
 const loadDatasetBtn = document.getElementById('loadDatasetBtn');
 const datasetInfo = document.getElementById('datasetInfo');
 const urlInput = document.getElementById('urlInput');
 const loadUrlBtn = document.getElementById('loadUrlBtn');
 const fileInput = document.getElementById('fileInput');
 const fileLabel = document.getElementById('fileLabel');
 const status = document.getElementById('status');
 const canvas = document.getElementById('canvas');
 const pagination = document.getElementById('pagination');
 const prevBtn = document.getElementById('prevBtn');
 const nextBtn = document.getElementById('nextBtn');
 const currentPage = document.getElementById('currentPage');
 const totalPages = document.getElementById('totalPages');
 const nodeCount = document.getElementById('nodeCount');
 const edgeCount = document.getElementById('edgeCount');
 // Initialize selectors
 function initSelectors() {
 const sValues = [...new Set(Object.keys(DATASETS).map(k => k.split(',')[0]))].sort((a,b) => a-b);
 selectS.innerHTML = sValues.map(s => `<option value="${s}">${s}</option>`).join('');
 updateTOptions();
 }
 function updateTOptions() {
 const s = selectS.value;
 const tValues = [...new Set(Object.keys(DATASETS).filter(k => k.startsWith(s+',')).map(k => k.split(',')[1]))].sort((a,b) => a-b);
 selectT.innerHTML = tValues.map(t => `<option value="${t}">${t}</option>`).join('');
 updateNOptions();
 }
 function updateNOptions() {
 const key = `${selectS.value},${selectT.value}`;
 const nValues = DATASETS[key] || [];
 selectN.innerHTML = nValues.map(n => `<option value="${n}">${n}</option>`).join('');
 updateDatasetInfo();
 }
 function updateDatasetInfo() {
 const s = selectS.value, tVal = selectT.value, n = selectN.value;
 const fileKey = `r${s}${tVal}_${n}`;
 const count = GRAPH_COUNTS[fileKey] || GRAPH_COUNTS[fileKey + 'some'] || '?';
 const isCompressed = COMPRESSED.has(fileKey);
 const countText = t('graphCount', count.toLocaleString());
 datasetInfo.innerHTML = `${countText}${isCompressed ? ` <span style="color:var(--accent-blue)">${t('compressed')}</span>` : ''}`;
 }
 function getDatasetUrl() {
 const s = selectS.value, t = selectT.value, n = selectN.value;
 let fileKey = `r${s}${t}_${n}`;
 if (['4,6', '5,5'].includes(`${s},${t}`)) {
 fileKey += 'some';
 }
 const ext = COMPRESSED.has(fileKey.replace('some','')) ? '.g6.gz' : '.g6';
 return `https://huggingface.co/datasets/linxy/RamseyGraph/resolve/main/data/${fileKey}${ext}?download=true`;
 }
 selectS.addEventListener('change', updateTOptions);
 selectT.addEventListener('change', updateNOptions);
 selectN.addEventListener('change', updateDatasetInfo);
 // Status helper
 function showStatus(msg, type = 'info') {
 status.textContent = msg;
 status.className = `status show ${type}`;
 if (type !== 'error') {
 setTimeout(() => status.className = 'status', 3000);
 }
 }
 // Parse graph6
 function parseGraph6(line) {
 line = line.trim();
 if (!line) return null;
 let pos = 0;
 let n;
 const firstByte = line.charCodeAt(pos) - 63;
 if (firstByte < 63) {
 n = firstByte;
 pos++;
 } else if (line.charCodeAt(pos + 1) - 63 < 63) {
 n = ((line.charCodeAt(pos + 1) - 63) << 12) |
 ((line.charCodeAt(pos + 2) - 63) << 6) |
 (line.charCodeAt(pos + 3) - 63);
 pos += 4;
 } else {
 n = ((line.charCodeAt(pos + 2) - 63) << 30) |
 ((line.charCodeAt(pos + 3) - 63) << 24) |
 ((line.charCodeAt(pos + 4) - 63) << 18) |
 ((line.charCodeAt(pos + 5) - 63) << 12) |
 ((line.charCodeAt(pos + 6) - 63) << 6) |
 (line.charCodeAt(pos + 7) - 63);
 pos += 8;
 }
 const edges = [];
 let bitPos = 0;
 let currentByte = 0;
 for (let j = 1; j < n; j++) {
 for (let i = 0; i < j; i++) {
 if (bitPos === 0) {
 if (pos >= line.length) break;
 currentByte = line.charCodeAt(pos) - 63;
 pos++;
 }
 const bit = (currentByte >> (5 - bitPos)) & 1;
 bitPos = (bitPos + 1) % 6;
 if (bit === 1) edges.push([i, j]);
 }
 }
 return { nodes: n, edges };
 }
 // Load functions
 async function loadFromUrl(url) {
 showStatus(t('loading') + '...', 'info');
 canvas.innerHTML = `<div class="loading">${t('loading')}</div>`;
 try {
 const response = await fetch(url);
 if (!response.ok) throw new Error(`HTTP ${response.status}`);
 let text;
 if (url.includes('.gz')) {
 const buffer = await response.arrayBuffer();
 const decompressed = await decompress(buffer);
 text = new TextDecoder().decode(decompressed);
 } else {
 text = await response.text();
 }
 parseAndDisplay(text);
 showStatus(t('loadedGraphs', graphs.length), 'success');
 } catch (err) {
 showStatus(t('errorLoading', err.message), 'error');
 canvas.innerHTML = `<div class="empty-state"><div class="empty-icon">!</div><div>${t('failedToLoad')}</div></div>`;
 }
 }
 async function decompress(buffer) {
 const ds = new DecompressionStream('gzip');
 const decompressedStream = new Response(new Blob([buffer]).stream().pipeThrough(ds)).arrayBuffer();
 return new Uint8Array(await decompressedStream);
 }
 function loadFromFile(file) {
 showStatus(t('loading') + '...', 'info');
 const reader = new FileReader();
 reader.onload = async (e) => {
 let text;
 if (file.name.endsWith('.gz')) {
 const decompressed = await decompress(e.target.result);
 text = new TextDecoder().decode(decompressed);
 } else {
 text = e.target.result;
 }
 parseAndDisplay(text);
 showStatus(t('loadedGraphs', graphs.length), 'success');
 };
 reader.onerror = () => showStatus(t('errorLoading', 'File read error'), 'error');
 if (file.name.endsWith('.gz')) {
 reader.readAsArrayBuffer(file);
 } else {
 reader.readAsText(file);
 }
 }
 function parseAndDisplay(text) {
 graphs = [];
 const lines = text.split('\n');
 for (const line of lines) {
 const g = parseGraph6(line);
 if (g) graphs.push(g);
 }
 if (graphs.length > 0) {
 currentIndex = 0;
 updatePagination();
 visualize(0);
 } else {
 showStatus(t('noValidGraphs'), 'error');
 }
 }
 function updatePagination() {
 pagination.style.display = graphs.length > 1 ? 'flex' : 'none';
 currentPage.textContent = currentIndex + 1;
 totalPages.textContent = graphs.length;
 prevBtn.disabled = currentIndex === 0;
 nextBtn.disabled = currentIndex === graphs.length - 1;
 }
 function getComplement(n, edges) {
 const set = new Set(edges.map(e => `${e[0]}-${e[1]}`));
 const comp = [];
 for (let i = 0; i < n; i++) {
 for (let j = i + 1; j < n; j++) {
 if (!set.has(`${i}-${j}`)) comp.push([i, j]);
 }
 }
 return comp;
 }
 // Build adjacency matrix
 function buildAdjMatrix(n, edges) {
 const matrix = Array.from({ length: n }, () => Array(n).fill(0));
 for (const [i, j] of edges) {
 matrix[i][j] = 1;
 matrix[j][i] = 1;
 }
 return matrix;
 }
 // Main visualization dispatcher
 function visualize(index) {
 if (index < 0 || index >= graphs.length) return;
 currentIndex = index;
 const g = graphs[index];
 nodeCount.textContent = g.nodes;
 edgeCount.textContent = g.edges.length;
 updatePagination();
 if (displayMode === 'force') {
 visualizeForce(g);
 } else {
 visualizeMatrix(g);
 }
 }
 // Force-directed graph visualization
 function visualizeForce(g) {
 canvas.innerHTML = '';
 const nodes = Array.from({ length: g.nodes }, (_, i) => ({ id: i }));
 let links = [];
 if (viewMode === 'graph') {
 links = g.edges.map(e => ({ source: e[0], target: e[1], type: 'graph' }));
 } else if (viewMode === 'complement') {
 links = getComplement(g.nodes, g.edges).map(e => ({ source: e[0], target: e[1], type: 'complement' }));
 } else {
 links = g.edges.map(e => ({ source: e[0], target: e[1], type: 'graph' }));
 links = links.concat(getComplement(g.nodes, g.edges).map(e => ({ source: e[0], target: e[1], type: 'complement' })));
 }
 const rect = canvas.getBoundingClientRect();
 const width = rect.width;
 const height = rect.height;
 const svg = d3.select('#canvas').append('svg').attr('width', width).attr('height', height);
 simulation = d3.forceSimulation(nodes)
 .force('link', d3.forceLink(links).id(d => d.id).distance(60))
 .force('charge', d3.forceManyBody().strength(-150))
 .force('center', d3.forceCenter(width / 2, height / 2))
 .force('collision', d3.forceCollide().radius(16));
 const link = svg.append('g')
 .selectAll('line')
 .data(links)
 .join('line')
 .attr('class', 'link')
 .attr('stroke', d => d.type === 'graph' ? '#ff3366' : '#00d4ff')
 .attr('stroke-width', 2);
 const node = svg.append('g')
 .selectAll('circle')
 .data(nodes)
 .join('circle')
 .attr('class', 'node')
 .attr('r', 8)
 .attr('fill', '#e8e8e8')
 .call(drag(simulation));
 const label = svg.append('g')
 .selectAll('text')
 .data(nodes)
 .join('text')
 .attr('class', 'node-label')
 .text(d => d.id);
 simulation.on('tick', () => {
 link.attr('x1', d => d.source.x).attr('y1', d => d.source.y)
 .attr('x2', d => d.target.x).attr('y2', d => d.target.y);
 node.attr('cx', d => d.x).attr('cy', d => d.y);
 label.attr('x', d => d.x).attr('y', d => d.y + 20);
 });
 }
 // Matrix visualization
 function visualizeMatrix(g) {
 canvas.innerHTML = '';
 const n = g.nodes;
 const edgeMatrix = buildAdjMatrix(n, g.edges);
 const compMatrix = buildAdjMatrix(n, getComplement(n, g.edges));
 // Calculate cell size based on available space
 const rect = canvas.getBoundingClientRect();
 const availableSize = Math.min(rect.width - 80, rect.height - 60);
 const cellSize = Math.max(16, Math.min(32, Math.floor(availableSize / n)));
 const container = document.createElement('div');
 container.className = 'matrix-container';
 const wrapper = document.createElement('div');
 wrapper.className = 'matrix-wrapper';
 wrapper.style.setProperty('--cell-size', `${cellSize}px`);
 // Top labels
 const topLabels = document.createElement('div');
 topLabels.className = 'matrix-labels-top';
 for (let j = 0; j < n; j++) {
 const label = document.createElement('div');
 label.className = 'matrix-label';
 label.textContent = j;
 topLabels.appendChild(label);
 }
 wrapper.appendChild(topLabels);
 // Matrix rows
 for (let i = 0; i < n; i++) {
 const row = document.createElement('div');
 row.className = 'matrix-row';
 // Row label
 const rowLabel = document.createElement('div');
 rowLabel.className = 'matrix-row-label';
 rowLabel.textContent = i;
 row.appendChild(rowLabel);
 // Cells
 for (let j = 0; j < n; j++) {
 const cell = document.createElement('div');
 cell.className = 'matrix-cell';
 if (i === j) {
 cell.classList.add('diagonal');
 cell.textContent = '-';
 } else {
 const isEdge = edgeMatrix[i][j] === 1;
 const isComp = compMatrix[i][j] === 1;
 if (viewMode === 'graph') {
 if (isEdge) {
 cell.classList.add('edge');
 cell.textContent = '1';
 } else {
 cell.classList.add('empty');
 cell.textContent = '0';
 }
 } else if (viewMode === 'complement') {
 if (isComp) {
 cell.classList.add('complement');
 cell.textContent = '1';
 } else {
 cell.classList.add('empty');
 cell.textContent = '0';
 }
 } else { // both
 if (isEdge) {
 cell.classList.add('edge');
 cell.textContent = '1';
 } else if (isComp) {
 cell.classList.add('complement');
 cell.textContent = '1';
 } else {
 cell.classList.add('empty');
 cell.textContent = '0';
 }
 }
 }
 cell.title = `(${i}, ${j})`;
 row.appendChild(cell);
 }
 wrapper.appendChild(row);
 }
 container.appendChild(wrapper);
 canvas.appendChild(container);
 }
 function drag(sim) {
 return d3.drag()
 .on('start', e => { if (!e.active) sim.alphaTarget(0.3).restart(); e.subject.fx = e.subject.x; e.subject.fy = e.subject.y; })
 .on('drag', e => { e.subject.fx = e.x; e.subject.fy = e.y; })
 .on('end', e => { if (!e.active) sim.alphaTarget(0); e.subject.fx = null; e.subject.fy = null; });
 }
 // Event listeners
 loadDatasetBtn.addEventListener('click', () => loadFromUrl(getDatasetUrl()));
 loadUrlBtn.addEventListener('click', () => {
 const url = urlInput.value.trim();
 if (url) loadFromUrl(url);
 });
 urlInput.addEventListener('keypress', e => {
 if (e.key === 'Enter') loadUrlBtn.click();
 });
 fileInput.addEventListener('change', e => {
 if (e.target.files[0]) {
 fileLabel.textContent = e.target.files[0].name;
 fileLabel.classList.add('has-file');
 loadFromFile(e.target.files[0]);
 }
 });
 prevBtn.addEventListener('click', () => { if (currentIndex > 0) visualize(currentIndex - 1); });
 nextBtn.addEventListener('click', () => { if (currentIndex < graphs.length - 1) visualize(currentIndex + 1); });
 // Display mode toggle (Force / Matrix)
 document.querySelectorAll('#displayToggle .toggle-btn').forEach(btn => {
 btn.addEventListener('click', e => {
 document.querySelectorAll('#displayToggle .toggle-btn').forEach(b => b.classList.remove('active'));
 e.target.classList.add('active');
 displayMode = e.target.dataset.display;
 if (graphs.length > 0) visualize(currentIndex);
 });
 });
 // View mode toggle (G / G' / Both)
 document.querySelectorAll('#viewToggle .toggle-btn').forEach(btn => {
 btn.addEventListener('click', e => {
 document.querySelectorAll('#viewToggle .toggle-btn').forEach(b => b.classList.remove('active'));
 e.target.classList.add('active');
 viewMode = e.target.dataset.mode;
 if (graphs.length > 0) visualize(currentIndex);
 });
 });
 // Keyboard navigation
 document.addEventListener('keydown', e => {
 if (graphs.length === 0) return;
 if (e.key === 'ArrowLeft' || e.key === 'a') prevBtn.click();
 if (e.key === 'ArrowRight' || e.key === 'd') nextBtn.click();
 if (e.key === 'm') {
 displayMode = displayMode === 'force' ? 'matrix' : 'force';
 document.querySelectorAll('#displayToggle .toggle-btn').forEach(b => {
 b.classList.toggle('active', b.dataset.display === displayMode);
 });
 visualize(currentIndex);
 }
 });
 // Language toggle
 document.querySelectorAll('.lang-btn').forEach(btn => {
 btn.addEventListener('click', () => setLanguage(btn.dataset.lang));
 });
 // Modal content
 const trophyIcon = '<svg style="width:16px;height:16px;vertical-align:middle;margin-right:4px;" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M6 9H4.5a2.5 2.5 0 0 1 0-5H6"></path><path d="M18 9h1.5a2.5 2.5 0 0 0 0-5H18"></path><path d="M4 22h16"></path><path d="M10 14.66V17c0 .55-.47.98-.97 1.21C7.85 18.75 7 20.24 7 22"></path><path d="M14 14.66V17c0 .55.47.98.97 1.21C16.15 18.75 17 20.24 17 22"></path><path d="M18 2H6v7a6 6 0 0 0 12 0V2Z"></path></svg>';
 const lightbulbIcon = '<svg style="width:16px;height:16px;vertical-align:middle;margin-right:4px;" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M15 14c.2-1 .7-1.7 1.5-2.5 1-.9 1.5-2.2 1.5-3.5A6 6 0 0 0 6 8c0 1 .2 2.2 1.5 3.5.7.7 1.3 1.5 1.5 2.5"></path><path d="M9 18h6"></path><path d="M10 22h4"></path></svg>';
 const introContent = {
 en: `
 <p><strong>A Ramsey(s,t,n) graph</strong> is a graph with <span class="highlight">n vertices</span> that contains no clique of size s and no independent set of size t.</p>
 <p>The <strong>Ramsey Theorem</strong> states that for given s and t, the number of Ramsey(s,t) graphs is finite. The minimum number of vertices for which no such graph exists is called the <strong>Ramsey Number R(s,t)</strong>.</p>
 <p>For given s and t, as the number of vertices n increases, there exists a <span class="highlight">critical threshold</span>—once n exceeds this threshold, a clique of size s or an independent set of size t <strong>must</strong> exist in any graph. Finding Ramsey graphs means finding this critical vertex count: the exact point where we can still find at least one special graph that contains neither a clique of size s nor an independent set of size t.</p>
 <div class="significance">
 <strong>${lightbulbIcon}Why It Matters:</strong> If we had an algorithm to determine the exact Ramsey number in advance, we would know precisely when certain substructures <strong>must</strong> appear in a system. This knowledge could help avoid maintaining excess nodes, potentially saving significant costs in network design, distributed systems, and other applications.
 </div>
 <p>Finding all such graphs, or even determining the maximum n for which they exist, is a famous problem in combinatorics. Most Ramsey numbers are still unknown—we only know upper and lower bounds.</p>
 <div class="challenge">
 <strong>${trophyIcon}Open Challenge:</strong> Find a <span class="highlight">Ramsey(5,5) graph with 43 vertices</span>!<br><br>
 All 42-vertex Ramsey(5,5) graphs have been found, but it's unknown if a 43-vertex one exists. The lower bound of R(5,5) hasn't been improved since <strong>1989</strong>. Finding just one such graph would be a major breakthrough—${new Date().getFullYear() - 1989} years in the making!
 </div>
 <p>For the latest research on Ramsey graphs, see <strong>Radziszowski's</strong> dynamic survey published in the <a href="https://www.combinatorics.org" target="_blank" style="color: var(--accent-blue);">Electronic Journal of Combinatorics</a>.</p>
 `,
 zh: `
 <p><strong>Ramsey(s,t,n) 图</strong>是具有 <span class="highlight">n 个顶点</span>的图，它不包含大小为 s 的团，也不包含大小为 t 的独立集。</p>
 <p><strong>拉姆齐定理</strong>表明，对于给定的 s 和 t，Ramsey(s,t) 图的数量是有限的。满足这种图存在的最小顶点数称为<strong>拉姆齐数 R(s,t)</strong>。</p>
 <p>对于给定的 s 和 t，当节点数量 n 增加时，存在一个<span class="highlight">临界数量</span>——一旦节点数超过这个临界值，大小为 s 的团或大小为 t 的独立集就<strong>一定</strong>存在于任意图中。寻找 Ramsey 图就是在寻找这个临界节点数：在这个节点数量下，我们恰好至少能找到一个很特殊的图，它既不包含大小为 s 的团，也不包含大小为 t 的独立集。</p>
 <div class="significance">
 <strong>${lightbulbIcon}重要意义：</strong>如果我们能有一种算法提前知道拉姆齐数的具体值，就相当于知道系统中某种子结构在什么时候<strong>必然</strong>开始存在。这样就不用保持过量的节点，从而在网络设计、分布式系统等应用中节省成本。
 </div>
 <p>找到所有这样的图，甚至确定它们存在的最大 n，都是组合数学中的著名难题。大多数拉姆齐数仍然未知——我们只知道它们的上界和下界。</p>
 <div class="challenge">
 <strong>${trophyIcon}开放挑战：</strong>找到一个 <span class="highlight">43 顶点的 Ramsey(5,5) 图</span>！<br><br>
 目前所有 42 顶点的 Ramsey(5,5) 图都已被找到，但不确定是否存在 43 顶点的图。R(5,5) 的下界自 <strong>1989 年</strong>以来就没有被改进过。只要找到一个这样的图，就是这个领域 ${new Date().getFullYear() - 1989} 年来的重大突破！
 </div>
 <p>有关 Ramsey 图的最新研究，请参见 <strong>Radziszowski</strong> 的动态综述，持续更新刊登于<a href="https://www.combinatorics.org" target="_blank" style="color: var(--accent-blue);">电子组合学期刊</a>。</p>
 `
 };
 const ramseyTable = [
 ['s\\t', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10'],
 ['1', '1', '1', '1', '1', '1', '1', '1', '1', '1', '1'],
 ['2', '-', '2', '3', '4', '5', '6', '7', '8', '9', '10'],
 ['3', '-', '-', '6', '9', '14', '18', '23', '28', '36', '40-41'],
 ['4', '-', '-', '-', '18', '25', '36-40', '49-58', '59-79', '73-106', '92-136'],
 ['5', '-', '-', '-', '-', '43-48', '59-85', '80-133', '101-194', '133-282', '149-381'],
 ['6', '-', '-', '-', '-', '-', '102-161', '115-273', '134-427', '183-656', '204-949'],
 ['7', '-', '-', '-', '-', '-', '-', '205-497', '219-840', '252-1379', '292-2134'],
 ['8', '-', '-', '-', '-', '-', '-', '-', '282-1532', '329-2683', '343-4432'],
 ['9', '-', '-', '-', '-', '-', '-', '-', '-', '565-5366', '581-9797'],
 ['10', '-', '-', '-', '-', '-', '-', '-', '-', '-', '798-17730']
 ];
 function generateProgressTable() {
 let html = '<table class="ramsey-table"><thead><tr>';
 ramseyTable[0].forEach(h => html += `<th>${h}</th>`);
 html += '</tr></thead><tbody>';
 for (let i = 1; i < ramseyTable.length; i++) {
 html += '<tr>';
 ramseyTable[i].forEach((cell, j) => {
 if (j === 0) {
 html += `<th>${cell}</th>`;
 } else if (cell === '-') {
 html += `<td class="trivial">-</td>`;
 } else if (cell.includes('-')) {
 html += `<td class="range">${cell}</td>`;
 } else {
 html += `<td class="exact">${cell}</td>`;
 }
 });
 html += '</tr>';
 }
 html += '</tbody></table>';
 html += `<div class="table-legend">
 <div class="table-legend-item"><div class="legend-box exact"></div><span data-i18n="exactValue">${t('exactValue')}</span></div>
 <div class="table-legend-item"><div class="legend-box range"></div><span data-i18n="rangeValue">${t('rangeValue')}</span></div>
 </div>`;
 return html;
 }
 function openModal(modalId) {
 const modal = document.getElementById(modalId);
 if (modalId === 'introModal') {
 document.getElementById('introBody').innerHTML = introContent[currentLang];
 } else if (modalId === 'progressModal') {
 document.getElementById('progressBody').innerHTML = generateProgressTable();
 }
 modal.classList.add('show');
 }
 function closeModal(modal) {
 modal.classList.remove('show');
 }
 // Modal event listeners
 document.getElementById('introBtn').addEventListener('click', () => openModal('introModal'));
 document.getElementById('progressBtn').addEventListener('click', () => openModal('progressModal'));
 document.querySelectorAll('.modal-overlay, .modal-close').forEach(el => {
 el.addEventListener('click', (e) => {
 const modal = e.target.closest('.modal');
 if (modal) closeModal(modal);
 });
 });
 document.addEventListener('keydown', e => {
 if (e.key === 'Escape') {
 document.querySelectorAll('.modal.show').forEach(m => closeModal(m));
 }
 });
 // Init
 initSelectors();
 // Apply saved language
 setLanguage(currentLang);
 </script>
</body>
</html>