body {
    font-family: "Microsoft Yahei",sans-serif;
    color: #333;
}

.navbar {
    background: #fff;
    border: none;
    box-shadow: 0 1px 5px rgba(0,0,0,0.08);
}

.navbar-brand {
    font-size: 22px;
    font-weight: bold;
    color: #2b57d8 !important;
}

.btn-blue {
    background: #2b68f0;
    color: #fff;
    border: none;
}

    .btn-blue:hover {
        background: #1f53cc;
        color: #fff;
    }

.btn-outline-blue {
    border: 1px solid #2b68f0;
    color: #2b68f0;
    background: #fff;
}

    .btn-outline-blue:hover {
        background: #2b68f0;
        color: #fff;
    }
/* Hero首屏 */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg,#f4f7ff,#ffffff);
}

    .hero h1 {
        font-size: 36px;
        margin-bottom: 20px;
    }

    .hero p {
        font-size: 18px;
        color: #666;
        margin-bottom: 30px;
    }

.section {
    padding: 70px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

    .section-title h2 {
        font-size: 30px;
    }

.feature-item {
    text-align: center;
    padding: 20px 10px;
}

    .feature-item .icon-circle {
        width: 80px;
        height: 80px;
        border-radius: 50%;
        background: #2b78f0;
        margin: 0 auto 15px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 32px;
    }

.case-item {
    padding: 12px;
    text-align: center;
    border: 1px solid #eee;
    margin-bottom: 15px;
}

footer {
    background: #222938;
    color: #ccc;
    padding: 40px 0;
}


#stage {
    position: relative;
    width: 600px;
    height: 400px;
}

    #stage img {
        position: absolute; /* 两张图叠在一起 */
        top: 40px;
        left: 70px; 
        opacity: 0; /* 默认透明 */
        transition: opacity 0.6s ease; /* 渐入渐出时长 */
        width: 450px;
        width: 400px;
        border-radius: 10px;
    }

        #stage img.active {
            opacity: 1; /* 当前这张显示 */
  }