/* 1. 基础容器 */
    .ai-portfolio-section {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        background-color: #ffffff;
        padding: 80px 20px;
        max-width: 1240px;
        margin: 0 auto;
        color: #0f172a;
    }

    /* 顶部标题区域 */
    .ai-portfolio-header {
        text-align: center;
        margin-bottom: 60px;
    }

    .ai-portfolio-header h2 {
        font-size: 38px;
        font-weight: 800;
        margin-bottom: 15px;
        letter-spacing: -0.02em;
    }

    .ai-portfolio-header p {
        font-size: 17px;
        color: #64748b;
        max-width: 800px;
        margin: 0 auto;
        line-height: 1.6;
    }

    /* 2. 网格布局 - 4列 */
    .ai-portfolio-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 25px;
    }

    /* 3. 单个卡片样式 */
    .ai-capability-card {
        background: #ffffff;
        border: 1px solid #f1f5f9;
        border-radius: 32px; /* 维持超大圆角 */
        padding: 45px 30px;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.03);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        display: flex;
        flex-direction: column;
    }

    .ai-capability-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 25px 50px rgba(86, 184, 184, 0.12);
        border-color: rgba(86, 184, 184, 0.2);
    }

    /* 图标盒子 (淡色背景) */
    .cap-icon-box {
        width: 54px;
        height: 54px;
        background-color: #f0fafa; 
        color: #56B8B8; /* 您的主色调 */
        border-radius: 14px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 30px;
    }

    /* 卡片大标题 */
    .ai-capability-card h3 {
        font-size: 22px;
        font-weight: 800;
        margin: 0 0 25px 0;
        color: #0f172a;
    }

    /* 小标题标签 */
    .cap-label {
        font-size: 11px;
        font-weight: 800;
        color: #56B8B8; 
        text-transform: uppercase;
        letter-spacing: 1px;
        margin-bottom: 12px;
        display: block;
    }

    /* 描述文字 */
    .cap-desc {
        font-size: 15px;
        line-height: 1.6;
        color: #334155;
        margin-bottom: 25px;
        font-weight: 500;
    }

    /* 利益点 (斜体还原) */
    .cap-benefits {
        font-size: 14px;
        line-height: 1.5;
        color: #64748b;
        font-style: italic;
        margin: 0;
    }

    /* 4. 响应式适配 */
    @media (max-width: 1024px) {
        .ai-portfolio-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 640px) {
        .ai-portfolio-grid { grid-template-columns: 1fr; }
        .ai-portfolio-header h2 { font-size: 30px; }
        .ai-capability-card { padding: 35px 25px; }
    }