.bg-under {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 1;
}

.bg-under .section-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.bg-under .section-background.active {
    opacity: 1;
}

.bg-bove {
    position: relative;
    z-index: 2;
    background: transparent;
}

/* 为英雄区域添加背景图片支持 */
.hero-section .section-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.hero-section .section-background.loaded {
    opacity: 1;
}

.hero-section .section-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

/* 白色背景样式 */
.white-bg {
    background-color: #fff;
}

.white-overlay {
    background-color: rgba(255, 255, 255, 0.95);
}

/* 透明背景样式 */
.transparent-bg {
    background-color: transparent;
}

.transparent-overlay {
    background-color: rgba(0, 0, 0, 0.6); /* 可以根据需要调整透明度 */
}

/* 白色背景下所有内容的颜色设置 */
.white-bg .section-title,
.white-bg h2,
.white-bg h3,
.white-bg h4,
.white-bg p,
.white-bg .section-content,
.white-bg .advantage-number,
.white-bg .advantage-content h3,
.white-bg .advantage-content p,
.white-bg .tech-category h3,
.white-bg .tech-icon span {
    color: #333; /* 深色文字适合白色背景 */
}

/* 确保白色背景下的图标也是深色的 */
.white-bg .service-icon i,
.white-bg .tech-category i,
.white-bg .feature i {
    color: #333;
}

/* 透明背景下的文字颜色 */
.transparent-bg .section-title,
.transparent-bg h2,
.transparent-bg h3,
.transparent-bg h4,
.transparent-bg p,
.transparent-bg .section-content,
.transparent-bg .tabs-nav button,
.transparent-bg .solution-text p,
.transparent-bg .solution-features .feature span,
.transparent-bg .case-content h3,
.transparent-bg .case-content p {
    color: #fff; /* 白色文字适合透明黑色背景 */
}

/* 核心优势区块基础样式 */
#advantages.white-bg {
    background-color: #f8f9fa;
    padding: 30px 0;
}

#advantages.white-bg .section-overlay.white-overlay {
    background: rgba(255, 255, 255, 0.92);
}

#advantages.white-bg .section-title {
    display: block;
}

#advantages.white-bg .section-title:after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background: #0066cc;
    margin: 10px auto 0;
}

/* 优势容器布局 */
#advantages .advantages-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 优势项样式 */
#advantages .advantage-item {
    display: flex;
    background: white;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    position: relative;
}

#advantages .advantage-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}


/* 内容样式 */
#advantages .advantage-content {
    padding: 15px 20px;
    flex: 1;
}

#advantages .advantage-content h3 {
    color: #333;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 5px;
    font-size: 1.15rem;
}

#advantages .advantage-content p {
    color: #555;
    line-height: 1.4;
    margin-bottom: 0;
    font-size: 0.88rem;
}

/* 响应式调整 */
@media (max-width: 992px) {
    #advantages .advantages-container {
        grid-template-columns: 1fr;
        max-width: 100%;
    }
    
    #advantages .advantage-item {
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 576px) {
    #advantages.white-bg {
        padding: 25px 0;
    }
    
    #advantages.white-bg .section-title {
        font-size: 1.6rem;
        margin-bottom: 20px;
    }
    
    #advantages .advantage-number {
        min-width: 45px;
        font-size: 1.6rem;
    }
    
    #advantages .advantage-content {
        padding: 12px 15px;
    }
}