:root {
            --primary-color: #2c3e50;
            --secondary-color: #34495e;
            --accent-color: #7f8c8d;
            --light-color: #ecf0f1;
            --dark-color: #1a1a1a;
            --text-color: #333;
            --border-color: #ddd;
        }

        body {
            background-color: #f8f9fa;
            color: var(--text-color);
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        .profile-header {
            background: linear-gradient(rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.2)),
                url('http://www.qinguanling.com/img/bj.png');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 60px 0 30px;
            border-radius: 10px 10px 0 0;
        }

        .profile-avatar {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            border: 5px solid white;
            object-fit: cover;
            margin-bottom: 20px;
        }

        .stats-container {
            display: flex;
            justify-content: space-around;
            text-align: center;
            margin: 0 0 30px 0;
            background-color: white;
            padding: 20px;
            border-radius: 0 0 10px 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
        }

        .stat-item {
            padding: 0 15px;
        }

        .stat-number {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
        }

        .stat-label {
            font-size: 14px;
            color: var(--accent-color);
        }

        .tab-content {
            margin-top: 30px;
        }

        .nav-tabs .nav-link {
            color: var(--accent-color);
            font-weight: 500;
            border: none;
            padding: 12px 25px;
        }

        .nav-tabs .nav-link.active {
            color: var(--primary-color);
            border-bottom: 3px solid var(--primary-color);
            background-color: transparent;
        }

        .profile-btn {
            padding: 8px 20px;
            border-radius: 15px;
            transition: all 0.3s ease;
            font-weight: 500;
            border: none;
        }

        .follow-btn {
            background-color: var(--primary-color);
            color: white;
        }

        .follow-btn.following {
            background-color: var(--accent-color);
        }

        .message-btn {
            background-color: var(--primary-color);
            color: white;
        }


        .collection-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 20px;
        }

        .collection-item {
            background-color: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .collection-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }

        .collection-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .collection-info {
            padding: 10px;
        }

   
        .collection-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
        }

        .collection-name {
            font-weight: bold;
            font-size: 16px;
            color: var(--primary-color);
        }

        .collection-value {
            color: #e74c3c;
            font-weight: 600;
        }

        .collection-date {
            font-size: 14px;
            color: #95a5a6;
            text-align: left;
        }

        @media (max-width: 1024px) {
            .collection-container {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            .profile-avatar {
                width: 120px;
                height: 120px;
            }

            .stats-container {
                gap: 15px;
            }

            .stat-item {
                padding: 10px 0;
            }

            .collection-container {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .collection-container {
                grid-template-columns: repeat(2, 1fr);
                gap: 15px;
            }
        }