body {
    padding-top: 50px;
    padding-bottom: 40px;
    color: #5a5a5a;
}


/* 轮播广告 */

.carousel {
    height: 500px;
    margin-bottom: 60px;
}

.carousel .item {
    height: 500px;
    background-color: #000;
}

.carousel .item img {
    width: 100%;
}

.carousel-caption {
    z-index: 10;
}

.carousel-caption p {
    margin-bottom: 20px;
    font-size: 20px;
    line-height: 1.8;
}


/* 简介 */

.summary {
    padding-right: 15px;
    padding-left: 15px;
}

.summary .col-md-4 {
    margin-bottom: 20px;
    text-align: center;
}


/* 特性 */

.feature-divider {
    margin: 40px 0;
}

.feature {
    padding: 30px 0;
}

.feature-heading {
    font-size: 50px;
    color: #2a6496;
}

.feature-heading .text-muted {
    font-size: 28px;
}

h3,
section {
    margin: 0;
}

h3 {
    padding: 0;
    text-align: center;
    background: #B0C4DE;
    font-size: 1.5em;
    line-height: 1.7;
    color: #000080;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, .5);
}

.demo {
    width: 700px;
    border: 2px solid #6495ED;
    margin: 20px auto;
}

.uploadchoose {
    padding: 10px;
    border-bottom: 1px solid #4169E1;
}

#dragarea {
    width: 500px;
    display: inline-block;
    border: 1px dashed #4169E1;
    text-align: center;
    height: 200px;
    line-height: 200px;
    background: #E0FFFF;
}

#preview {
    padding: 10px;
}


/* 响应式布局 */


/* 超小屏幕 手机 (<768px) */

@media (max-width: 768px) {
    .summary {
        padding-right: 3px;
        padding-left: 3px;
    }
    .carousel {
        height: 300px;
        margin-bottom: 30px;
    }
    .carousel .item {
        height: 300px;
    }
    .carousel img {
        min-height: 300px;
    }
    .carousel-caption p {
        font-size: 16px;
        line-height: 1.4;
    }
    .feature-heading {
        font-size: 34px;
    }
    .feature-heading .text-muted {
        font-size: 22px;
    }
}


/* 中等屏幕（桌面显示器，大于等于 992px） */

@media (min-width: 992px) {
    .feature-heading {
        margin-top: 120px;
    }
}