/* 新增美化样式 - 优化居中布局 */
    .tools-section {
        background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
        padding: 80px 0;
    }
    
    .section-header {
        text-align: center;
        margin-bottom: 60px;
        width: 100%;
    }
    
    .section-header .heading {
        font-size: 3.2rem;
        font-weight: 700;
        color: #2c3e50;
        margin-bottom: 15px;
        position: relative;
        display: inline-block;
    }
    
    .section-header .heading::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background: linear-gradient(90deg, #3498db, #2ecc71);
        border-radius: 2px;
    }
    
    .section-header .subheading {
        font-size: 1.2rem;
        color: #7f8c8d;
        max-width: 600px;
        margin: 25px auto 0;
        line-height: 1.6;
    }
    
    .download-card {
        background: white;
        border-radius: 16px;
        padding: 30px;
        margin: 0 auto 30px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
        border: 1px solid rgba(255, 255, 255, 0.2);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        position: relative;
        overflow: hidden;
        width: 100%;
    }
    
    .download-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: linear-gradient(180deg, #3498db, #2ecc71);
    }
    
    .download-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
    }
    
    .card-header {
        display: flex;
        align-items: center;
        margin-bottom: 25px;
        padding-bottom: 15px;
        border-bottom: 2px solid #f8f9fa;
        width: 100%;
    }
    
    .card-icon {
        width: 56px;
        height: 56px;
        border-radius: 14px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-right: 20px;
        font-size: 24px;
        color: white;
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        flex-shrink: 0;
    }
    
    .icon-mobile { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
    .icon-desktop { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
    .icon-cloud { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
    
    .card-header h4 {
        font-size: 1.8rem;
        font-weight: 600;
        color: #2c3e50;
        margin: 0;
    }
    
    .card-subtitle {
        font-size: 0.95rem;
        color: #7f8c8d;
        margin-top: 5px;
    }
    
    .download-content {
        width: 100%;
    }
    
    .download-content h5 {
        font-size: 1.5rem;
        color: #34495e;
        margin-bottom: 12px;
        font-weight: 600;
    }
    
    .item-description {
        color: #5d6d7e;
        font-size: 1.05rem;
        line-height: 1.6;
        margin-bottom: 20px;
        width: 100%;
    }
    
    .meta-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        margin-bottom: 25px;
        width: 100%;
    }
    
    .tag {
        padding: 8px 16px;
        border-radius: 20px;
        font-size: 0.9rem;
        font-weight: 500;
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }
    
    .platform-tag { background: #e8f4fc; color: #2980b9; }
    .version-tag { background: #f0f7f0; color: #27ae60; }
    .size-tag { background: #f9f3e9; color: #d35400; }
    .access-tag { background: #e8f6f3; color: #16a085; }
    
    .download-buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 15px;
        margin-top: 25px;
        width: 100%;
    }
    
    .btn-download {
        padding: 14px 32px;
        border-radius: 12px;
        font-weight: 600;
        font-size: 1.05rem;
        border: none;
        transition: all 0.3s ease;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        text-decoration: none;
        cursor: pointer;
        text-align: center;
    }
    
    .btn-primary {
        background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
        color: white;
        box-shadow: 0 6px 15px rgba(52, 152, 219, 0.3);
    }
    
    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 20px rgba(52, 152, 219, 0.4);
        color: white;
        text-decoration: none;
    }
    
    .btn-secondary {
        background: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
        color: white;
        box-shadow: 0 6px 15px rgba(149, 165, 166, 0.3);
    }
    
    .btn-success {
        background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
        color: white;
        box-shadow: 0 6px 15px rgba(46, 204, 113, 0.3);
    }
    
    .windows-options {
        background: #f8f9fa;
        border-radius: 12px;
        padding: 25px;
        margin: 20px 0;
        width: 100%;
    }
    
    .option-card {
        background: white;
        border-radius: 10px;
        padding: 20px;
        margin-bottom: 15px;
        border: 1px solid #eaeaea;
        transition: transform 0.3s ease;
        width: 100%;
    }
    
    .option-card:hover {
        transform: translateX(5px);
        border-color: #3498db;
    }
    
    .system-req {
        background: #f9f9f9;
        padding: 15px 20px;
        border-radius: 10px;
        margin-top: 20px;
        border-left: 4px solid #3498db;
        width: 100%;
    }
    
    .security-card {
        background: linear-gradient(135deg, #fff9e6 0%, #fff3cd 100%);
        border-radius: 12px;
        padding: 25px;
        margin: 40px auto 0;
        border: 1px solid #ffeaa7;
        width: 100%;
        max-width: 900px;
    }
    
    .security-header {
        display: flex;
        align-items: center;
        gap: 15px;
        margin-bottom: 20px;
    }
    
    .security-header i {
        color: #f39c12;
        font-size: 28px;
    }
    
    .security-list {
        list-style: none;
        padding: 0;
        margin: 0;
        width: 100%;
    }
    
    .security-list li {
        padding: 8px 0;
        color: #5d6d7e;
        position: relative;
        padding-left: 25px;
    }
    
    .security-list li::before {
        content: '✓';
        position: absolute;
        left: 0;
        color: #27ae60;
        font-weight: bold;
    }
    
    .action-grid {
        display: flex;
        justify-content: center;
        gap: 20px;
        margin: 40px auto 0;
        flex-wrap: wrap;
        width: 100%;
        max-width: 900px;
    }
    
    .action-btn {
        padding: 16px 40px;
        border-radius: 50px;
        font-weight: 600;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 12px;
        transition: all 0.3s ease;
        font-size: 1.1rem;
        text-align: center;
    }
    
    .btn-wechat {
        background: linear-gradient(135deg, #09bb07 0%, #0a8c08 100%);
        color: white;
        box-shadow: 0 8px 20px rgba(9, 187, 7, 0.3);
    }
    
    .btn-apply {
        background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
        color: white;
        box-shadow: 0 8px 20px rgba(231, 76, 60, 0.3);
    }
    
    .action-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 12px 25px rgba(0, 0, 0, 0.2);
        color: white;
        text-decoration: none;
    }
    
    /* 新增居中布局样式 */
    .about_right {
        width: 100%;
        max-width: 900px;
        margin: 0 auto;
        float: none;
        padding: 0;
    }
    
    .container {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 15px;
    }
    
    .row.justify-content-center {
        display: flex;
        justify-content: center;
        margin: 0;
    }
    
    @media (max-width: 768px) {
        .tools-section {
            padding: 50px 0;
        }
        
        .section-header .heading {
            font-size: 2.5rem;
        }
        
        .download-card {
            padding: 20px;
            margin: 0 auto 20px;
            width: 95%;
        }
        
        .download-buttons {
            flex-direction: column;
        }
        
        .btn-download {
            width: 100%;
            justify-content: center;
        }
        
        .action-grid {
            flex-direction: column;
            align-items: center;
        }
        
        .action-btn {
            width: 100%;
            max-width: 300px;
            justify-content: center;
        }
        
        .container {
            padding: 0 10px;
        }
        
        .security-card {
            margin: 30px auto 0;
            width: 95%;
        }
    }