<!DOCTYPE html>
        <html lang="zh-CN">
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
            <title>网址导航</title>
            <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css">
            <link href="https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;700&family=Exo+2:wght@300;400;500;600&display=swap" rel="stylesheet">
            <style>
            * {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }
            
            :root {
                --primary-color: #00d4ff;
                --secondary-color: #0099ff;
                --dark-bg: #0a0e17;
                --darker-bg: #050811;
                --light-text: #ffffff;
                --gray-text: #a0aec0;
                --card-bg: rgba(16, 23, 41, 0.8);
                --border-color: rgba(0, 212, 255, 0.2);
                --success-color: #00ff9d;
                --warning-color: #ffb300;
                --danger-color: #ff4757;
            }
            
            .light-theme {
                --primary-color: #0066ff;
                --secondary-color: #0044cc;
                --dark-bg: #f5f7fa;
                --darker-bg: #e4e9f2;
                --light-text: #1a202c;
                --gray-text: #4a5568;
                --card-bg: rgba(255, 255, 255, 0.9);
                --border-color: rgba(0, 102, 255, 0.2);
            }
            
            .blue-theme {
                --primary-color: #3b82f6;
                --secondary-color: #1d4ed8;
                --dark-bg: #0f172a;
                --darker-bg: #1e293b;
                --light-text: #f8fafc;
                --gray-text: #94a3b8;
                --card-bg: rgba(30, 41, 59, 0.9);
                --border-color: rgba(59, 130, 246, 0.3);
            }
            
            body {
                font-family: "Exo 2", sans-serif;
                background-color: var(--dark-bg);
                color: var(--light-text);
                min-height: 100vh;
                background-image: 
                    radial-gradient(circle at 10% 20%, rgba(0, 212, 255, 0.05) 0%, transparent 20%),
                    radial-gradient(circle at 90% 80%, rgba(0, 153, 255, 0.05) 0%, transparent 20%);
                transition: background-color 0.3s, color 0.3s;
            }
            
            body.dark-theme {
                /* 应用主题 */
            }
            
            .container {
                max-width: 1400px;
                margin: 0 auto;
                padding: 20px;
            }
            
            /* 顶部栏样式 */
            .top-bar {
                display: flex;
                justify-content: space-between;
                align-items: center;
                margin-bottom: 30px;
                padding: 20px;
                background: var(--card-bg);
                border-radius: 16px;
                border: 1px solid var(--border-color);
                box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
                backdrop-filter: blur(10px);
            }
            
            .site-title {
                font-family: "Orbitron", sans-serif;
                font-weight: 700;
                font-size: 2.2rem;
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
            }
            
            .search-box {
                display: flex;
                flex-grow: 0.4;
                max-width: 400px;
            }
            
            .search-box input {
                flex-grow: 1;
                padding: 12px 20px;
                background: rgba(255, 255, 255, 0.1);
                border: 1px solid var(--border-color);
                border-radius: 50px 0 0 50px;
                color: var(--light-text);
                font-size: 16px;
                outline: none;
                transition: all 0.3s;
            }
            
            .search-box input:focus {
                border-color: var(--primary-color);
                box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
            }
            
            .search-box button {
                padding: 12px 25px;
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                border: none;
                border-radius: 0 50px 50px 0;
                color: white;
                cursor: pointer;
                font-size: 16px;
                transition: all 0.3s;
            }
            
            .search-box button:hover {
                transform: translateY(-2px);
                box-shadow: 0 5px 15px rgba(0, 212, 255, 0.4);
            }
            
            .view-controls {
                display: flex;
                gap: 10px;
            }
            
            .view-btn, .admin-btn, .logout-btn, .login-btn {
                padding: 10px 20px;
                background: rgba(255, 255, 255, 0.1);
                border: 1px solid var(--border-color);
                border-radius: 8px;
                color: var(--light-text);
                cursor: pointer;
                transition: all 0.3s;
                text-decoration: none;
                display: inline-flex;
                align-items: center;
                gap: 8px;
                font-family: "Exo 2", sans-serif;
            }
            
            .view-btn:hover, .admin-btn:hover, .logout-btn:hover, .login-btn:hover {
                background: rgba(0, 212, 255, 0.2);
                border-color: var(--primary-color);
                transform: translateY(-2px);
            }
            
            .view-btn.active {
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                color: white;
            }
            
            /* 分类样式 */
            .categories {
                display: flex;
                flex-wrap: wrap;
                gap: 10px;
                margin-bottom: 30px;
                padding: 15px;
                background: var(--card-bg);
                border-radius: 12px;
                border: 1px solid var(--border-color);
            }
            
            .category {
                padding: 8px 20px;
                background: rgba(255, 255, 255, 0.05);
                border: 1px solid var(--border-color);
                border-radius: 50px;
                color: var(--light-text);
                text-decoration: none;
                transition: all 0.3s;
            }
            
            .category:hover {
                background: rgba(0, 212, 255, 0.2);
                border-color: var(--primary-color);
                transform: translateY(-2px);
            }
            
            .category.active {
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                color: white;
            }
            
            /* 网址展示样式 */
            .sites-container {
                display: grid;
                gap: 20px;
                margin-bottom: 40px;
            }
            
            .grid-view {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            }
            
            .list-view {
                grid-template-columns: 1fr;
            }
            
            .card-view {
                grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            }
            
            .site-item {
                background: var(--card-bg);
                border-radius: 12px;
                border: 1px solid var(--border-color);
                padding: 20px;
                transition: all 0.3s;
                position: relative;
                overflow: hidden;
            }
            
            .site-item:hover {
                transform: translateY(-5px);
                border-color: var(--primary-color);
                box-shadow: 0 10px 25px rgba(0, 212, 255, 0.2);
            }
            
            .site-item::before {
                content: "";
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 3px;
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                transform: scaleX(0);
                transition: transform 0.3s;
            }
            
            .site-item:hover::before {
                transform: scaleX(1);
            }
            
            .site-logo {
                width: 60px;
                height: 60px;
                border-radius: 12px;
                overflow: hidden;
                margin-bottom: 15px;
                display: flex;
                align-items: center;
                justify-content: center;
                background: rgba(0, 212, 255, 0.1);
                border: 1px solid var(--border-color);
            }
            
            .site-logo img {
                width: 100%;
                height: 100%;
                object-fit: cover;
            }
            
            .logo-placeholder {
                width: 100%;
                height: 100%;
                display: flex;
                align-items: center;
                justify-content: center;
                font-size: 24px;
                font-weight: bold;
                background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
                color: white;
            }
            
            .site-info h3 {
                margin-bottom: 10px;
                font-size: 18px;
            }
            
            .site-info h3 a {
                color: var(--light-text);
                text-decoration: none;
                transition: color 0.3s;
            }
            
            .site-info h3 a:hover {
                color: var(--primary-color);
            }
            
            .site-description {
                color: var(--gray-text);
                font-size: 14px;
                line-height: 1.5;
                margin-bottom: 10px;
            }
            
            .site-tags {
                display: flex;
                flex-wrap: wrap;
                gap: 5px;
                margin-bottom: 15px;
            }
            
            .tag {
                padding: 3px 10px;
                background: rgba(0, 212, 255, 0.1);
                border-radius: 50px;
                font-size: 12px;
                color: var(--primary-color);
            }
            
            .site-meta {
                display: flex;
                justify-content: space-between;
                align-items: center;
                padding-top: 10px;
                border-top: 1px solid rgba(255, 255, 255, 0.05);
            }
            
            .site-meta .category {
                font-size: 12px;
                padding: 3px 10px;
                background: rgba(0, 212, 255, 0.1);
                border-radius: 50px;
                color: var(--primary-color);
            }
            
            .site-meta .actions {
                display: flex;
                gap: 8px;
            }
            
            .site-meta .actions a {
                color: var(--gray-text);
                transition: color 0.3s;
            }
            
            .site-meta .actions a:hover {
                color: var(--primary-color);
            }
            
            .empty-state {
                grid-column: 1 / -1;
                text-align: center;
                padding: 60px 20px;
            }
            
            .empty-state i {
                font-size: 60px;
                color: var(--primary-color);
                margin-bottom: 20px;
            }
            
            .empty-state h3 {
                font-size: 24px;
                margin-bottom: 10px;
            }
            
            .empty-state p {
                color: var(--gray-text);
            }
            
            /* 分页样式 */
            .pagination {
                display: flex;
                justify-content: center;
                gap: 5px;
                margin-bottom: 40px;
            }
            
            .pagination a {
                padding: 8px 15px;
                background: rgba(255, 255, 255, 0.05);
                border: 1px solid var(--border-color);
                border-radius: 6px;
                color: var(--light-text);
                text-decoration: none;
                transition: all 0.3s;
            }
            
            .pagination a:hover {
                background: rgba(0, 212, 255, 0.2);
                border-color: var(--primary-color);
            }
            
            .pagination a.active {
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                color: white;
                cursor: default;
            }
            
            /* 添加网址按钮 */
            .add-site-btn-container {
                text-align: center;
                margin-bottom: 30px;
            }
            
            .add-site-btn {
                display: inline-flex;
                align-items: center;
                gap: 10px;
                padding: 15px 30px;
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                border-radius: 50px;
                color: white;
                text-decoration: none;
                font-size: 16px;
                font-weight: 600;
                transition: all 0.3s;
                box-shadow: 0 5px 20px rgba(0, 212, 255, 0.3);
            }
            
            .add-site-btn:hover {
                transform: translateY(-3px);
                box-shadow: 0 10px 30px rgba(0, 212, 255, 0.4);
            }
            
            /* 登录页面样式 */
            .login-container {
                display: flex;
                justify-content: center;
                align-items: center;
                min-height: 100vh;
                padding: 20px;
                background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
            }
            
            .login-box {
                width: 100%;
                max-width: 400px;
                background: var(--card-bg);
                border-radius: 20px;
                border: 1px solid var(--border-color);
                padding: 40px;
                box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
                backdrop-filter: blur(10px);
            }
            
            .login-header {
                text-align: center;
                margin-bottom: 30px;
            }
            
            .login-header h2 {
                font-family: "Orbitron", sans-serif;
                font-size: 28px;
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                margin-bottom: 10px;
            }
            
            .login-header p {
                color: var(--gray-text);
                font-size: 14px;
            }
            
            .login-form .form-group {
                margin-bottom: 20px;
            }
            
            .login-form label {
                display: block;
                margin-bottom: 8px;
                color: var(--light-text);
                font-weight: 500;
            }
            
            .login-form input {
                width: 100%;
                padding: 12px 20px;
                background: rgba(255, 255, 255, 0.05);
                border: 1px solid var(--border-color);
                border-radius: 8px;
                color: var(--light-text);
                font-size: 16px;
                outline: none;
                transition: all 0.3s;
            }
            
            .login-form input:focus {
                border-color: var(--primary-color);
                box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
            }
            
            .btn-login {
                width: 100%;
                padding: 14px;
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                border: none;
                border-radius: 8px;
                color: white;
                font-size: 16px;
                font-weight: 600;
                cursor: pointer;
                transition: all 0.3s;
                margin-top: 10px;
            }
            
            .btn-login:hover {
                transform: translateY(-2px);
                box-shadow: 0 10px 25px rgba(0, 212, 255, 0.3);
            }
            
            .login-footer {
                text-align: center;
                margin-top: 30px;
                padding-top: 20px;
                border-top: 1px solid rgba(255, 255, 255, 0.05);
                color: var(--gray-text);
                font-size: 14px;
            }
            
            .alert {
                padding: 12px 20px;
                border-radius: 8px;
                margin-bottom: 20px;
                display: flex;
                align-items: center;
                gap: 10px;
            }
            
            .alert-error {
                background: rgba(255, 71, 87, 0.1);
                border: 1px solid rgba(255, 71, 87, 0.3);
                color: var(--danger-color);
            }
            
            /* 管理页面样式 */
            .admin-container {
                display: flex;
                min-height: 100vh;
            }
            
            .admin-sidebar {
                width: 250px;
                background: var(--card-bg);
                border-right: 1px solid var(--border-color);
                padding: 20px;
            }
            
            .admin-sidebar h3 {
                font-family: "Orbitron", sans-serif;
                margin-bottom: 30px;
                color: var(--primary-color);
                font-size: 18px;
            }
            
            .admin-sidebar ul {
                list-style: none;
            }
            
            .admin-sidebar li {
                margin-bottom: 10px;
            }
            
            .admin-sidebar a {
                display: block;
                padding: 12px 15px;
                color: var(--light-text);
                text-decoration: none;
                border-radius: 8px;
                transition: all 0.3s;
                display: flex;
                align-items: center;
                gap: 10px;
            }
            
            .admin-sidebar a:hover, .admin-sidebar a.active {
                background: rgba(0, 212, 255, 0.1);
                color: var(--primary-color);
            }
            
            .admin-content {
                flex-grow: 1;
                padding: 30px;
            }
            
            .admin-section {
                display: none;
            }
            
            .admin-section.active {
                display: block;
            }
            
            .admin-section h3 {
                font-family: "Orbitron", sans-serif;
                font-size: 24px;
                margin-bottom: 25px;
                color: var(--primary-color);
                display: flex;
                align-items: center;
                gap: 10px;
            }
            
            .table-container {
                overflow-x: auto;
                margin-bottom: 25px;
                background: var(--card-bg);
                border-radius: 12px;
                border: 1px solid var(--border-color);
            }
            
            .admin-table {
                width: 100%;
                border-collapse: collapse;
            }
            
            .admin-table th {
                text-align: left;
                padding: 15px;
                background: rgba(0, 0, 0, 0.2);
                color: var(--primary-color);
                font-weight: 600;
                border-bottom: 1px solid var(--border-color);
            }
            
            .admin-table td {
                padding: 15px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            }
            
            .admin-table tr:hover {
                background: rgba(0, 212, 255, 0.05);
            }
            
            .admin-table .actions {
                display: flex;
                gap: 10px;
            }
            
            .btn-edit, .btn-delete, .btn-add, .btn-save, .btn-cancel, .btn-sync, .btn-clear {
                padding: 8px 15px;
                border-radius: 6px;
                border: none;
                font-family: "Exo 2", sans-serif;
                font-size: 14px;
                cursor: pointer;
                transition: all 0.3s;
                text-decoration: none;
                display: inline-flex;
                align-items: center;
                gap: 5px;
            }
            
            .btn-edit {
                background: rgba(0, 212, 255, 0.1);
                color: var(--primary-color);
                border: 1px solid rgba(0, 212, 255, 0.3);
            }
            
            .btn-edit:hover {
                background: rgba(0, 212, 255, 0.2);
            }
            
            .btn-delete {
                background: rgba(255, 71, 87, 0.1);
                color: var(--danger-color);
                border: 1px solid rgba(255, 71, 87, 0.3);
            }
            
            .btn-delete:hover {
                background: rgba(255, 71, 87, 0.2);
            }
            
            .btn-add {
                background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
                color: white;
                border: none;
            }
            
            .btn-add:hover {
                transform: translateY(-2px);
                box-shadow: 0 5px 15px rgba(0, 212, 255, 0.3);
            }
            
            .btn-save {
                background: linear-gradient(90deg, var(--success-color), #00cc88);
                color: white;
                border: none;
            }
            
            .btn-save:hover {
                transform: translateY(-2px);
                box-shadow: 0 5px 15px rgba(0, 255, 157, 0.3);
            }
            
            .btn-cancel {
                background: rgba(255, 255, 255, 0.05);
                color: var(--light-text);
                border: 1px solid var(--border-color);
            }
            
            .btn-cancel:hover {
                background: rgba(255, 255, 255, 0.1);
            }
            
            .btn-sync {
                background: linear-gradient(90deg, #ffb300, #ff9500);
                color: white;
                margin-right: 10px;
                margin-bottom: 10px;
            }
            
            .btn-sync:hover {
                transform: translateY(-2px);
                box-shadow: 0 5px 15px rgba(255, 179, 0, 0.3);
            }
            
            .btn-clear {
                background: rgba(255, 71, 87, 0.1);
                color: var(--danger-color);
                border: 1px solid rgba(255, 71, 87, 0.3);
                margin-top: 10px;
            }
            
            .btn-clear:hover {
                background: rgba(255, 71, 87, 0.2);
            }
            
            .btn-delete-small {
                padding: 5px 10px;
                background: rgba(255, 71, 87, 0.1);
                color: var(--danger-color);
                border-radius: 4px;
                text-decoration: none;
                font-size: 12px;
                margin-left: 10px;
            }
            
            .form-group {
                margin-bottom: 20px;
            }
            
            .form-group label {
                display: block;
                margin-bottom: 8px;
                color: var(--light-text);
                font-weight: 500;
            }
            
            .form-group input, .form-group select, .form-group textarea {
                width: 100%;
                padding: 12px 15px;
                background: rgba(255, 255, 255, 0.05);
                border: 1px solid var(--border-color);
                border-radius: 8px;
                color: var(--light-text);
                font-family: "Exo 2", sans-serif;
                font-size: 16px;
                outline: none;
                transition: all 0.3s;
            }
            
            .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
                border-color: var(--primary-color);
                box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
            }
            
            .form-group textarea {
                min-height: 100px;
                resize: vertical;
            }
            
            .checkbox-group {
                display: flex;
                align-items: center;
                gap: 10px;
            }
            
            .checkbox-group input {
                width: auto;
            }
            
            .checkbox-group label {
                margin-bottom: 0;
            }
            
            .sync-urls ul {
                list-style: none;
                background: rgba(0, 0, 0, 0.2);
                border-radius: 8px;
                padding: 15px;
                margin-bottom: 25px;
            }
            
            .sync-urls li {
                padding: 10px 15px;
                background: rgba(255, 255, 255, 0.05);
                border-radius: 6px;
                margin-bottom: 10px;
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            
            .sync-urls li:last-child {
                margin-bottom: 0;
            }
            
            .sync-actions {
                margin-bottom: 30px;
            }
            
            .sync-log {
                background: rgba(0, 0, 0, 0.3);
                border-radius: 8px;
                padding: 20px;
                margin-top: 30px;
            }
            
            .sync-log pre {
                white-space: pre-wrap;
                font-family: monospace;
                font-size: 12px;
                color: var(--gray-text);
                max-height: 300px;
                overflow-y: auto;
                padding: 15px;
                background: rgba(0, 0, 0, 0.2);
                border-radius: 6px;
            }
            
            .sync-log h4 {
                margin-bottom: 15px;
                color: var(--primary-color);
            }
            
            .no-data {
                text-align: center;
                padding: 30px;
                color: var(--gray-text);
                font-style: italic;
            }
            
            .current-user {
                color: var(--primary-color);
                font-size: 12px;
            }
            
            /* 编辑页面样式 */
            .edit-container {
                max-width: 800px;
                margin: 0 auto;
                padding: 30px;
            }
            
            .edit-container h2 {
                font-family: "Orbitron", sans-serif;
                font-size: 28px;
                margin-bottom: 30px;
                color: var(--primary-color);
                display: flex;
                align-items: center;
                gap: 10px;
            }
            
            .edit-form {
                background: var(--card-bg);
                border-radius: 16px;
                border: 1px solid var(--border-color);
                padding: 30px;
                box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
            }
            
            .edit-form .form-group {
                margin-bottom: 25px;
            }
            
            .edit-form small {
                display: block;
                margin-top: 5px;
                color: var(--gray-text);
                font-size: 12px;
            }
            
            .form-actions {
                display: flex;
                gap: 15px;
                margin-top: 30px;
                padding-top: 20px;
                border-top: 1px solid rgba(255, 255, 255, 0.05);
            }
            
            /* 模态框样式 */
            .modal {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background: rgba(0, 0, 0, 0.8);
                display: flex;
                justify-content: center;
                align-items: center;
                z-index: 1000;
                backdrop-filter: blur(5px);
            }
            
            .modal-content {
                background: var(--card-bg);
                border-radius: 16px;
                border: 1px solid var(--border-color);
                padding: 30px;
                width: 90%;
                max-width: 500px;
                max-height: 90vh;
                overflow-y: auto;
            }
            
            .modal-content h3 {
                font-family: "Orbitron", sans-serif;
                font-size: 22px;
                margin-bottom: 25px;
                color: var(--primary-color);
                display: flex;
                align-items: center;
                gap: 10px;
            }
            
            /* 响应式设计 */
            @media (max-width: 992px) {
                .top-bar {
                    flex-direction: column;
                    gap: 20px;
                    text-align: center;
                }
                
                .search-box {
                    max-width: 100%;
                    width: 100%;
                }
                
                .admin-container {
                    flex-direction: column;
                }
                
                .admin-sidebar {
                    width: 100%;
                    border-right: none;
                    border-bottom: 1px solid var(--border-color);
                }
            }
            
            @media (max-width: 768px) {
                .container {
                    padding: 10px;
                }
                
                .site-title {
                    font-size: 1.8rem;
                }
                
                .grid-view, .card-view {
                    grid-template-columns: 1fr;
                }
                
                .admin-content {
                    padding: 15px;
                }
                
                .edit-container {
                    padding: 15px;
                }
            }
            
            @media (max-width: 480px) {
                .view-controls {
                    flex-wrap: wrap;
                    justify-content: center;
                }
                
                .categories {
                    justify-content: center;
                }
                
                .pagination {
                    flex-wrap: wrap;
                }
                
                .form-actions {
                    flex-direction: column;
                }
            }
            </style>
        </head>
        <body class="dark-theme"><br />
<b>Warning</b>:  Undefined array key "sites" in <b>/mnt/sda1/www/simple_nav.php</b> on line <b>178</b><br />
<br />
<b>Fatal error</b>:  Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /mnt/sda1/www/simple_nav.php:196
Stack trace:
#0 /mnt/sda1/www/simple_nav.php(158): NavSystem-&gt;showMainPage()
#1 /mnt/sda1/www/simple_nav.php(38): NavSystem-&gt;handleRequest()
#2 /mnt/sda1/www/simple_nav.php(2426): NavSystem-&gt;__construct()
#3 {main}
  thrown in <b>/mnt/sda1/www/simple_nav.php</b> on line <b>196</b><br />