/* 自定义样式 */
body {
    font-family: Arial, sans-serif;
    padding-top: 56px; /* 导航栏高度 */
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Banner 模块样式 */
.banner {
    background: url('media/banner.png') no-repeat center center/cover;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
    position: relative;
   
}

.banner-overlay {
    background: rgba(0, 0, 0, 0.5); /* 半透明黑色遮罩 */
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner h1 {
    font-size: 4rem;
    font-weight: bold;
    margin-bottom: 20px;
}

.banner .lead {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.banner-description {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 30px;
}

.banner .btn {
    font-size: 1.2rem;
    padding: 10px 30px;
    border-radius: 25px;
}

/* 动画效果 */
.animate__animated {
    animation-duration: 1s;
}

.animate__fadeInDown {
    animation-name: fadeInDown;
}

.animate__fadeInUp {
    animation-name: fadeInUp;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}