.section-banner {
    position: relative;
    height: 600px;
    overflow: hidden;
    background: #f5f7fa; /* 改为浅灰色背景，适配黑色文字 */
}

.banner-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease;
}

.banner-slide.active {
    opacity: 1;
    visibility: visible;
    z-index: 1;
}

.banner-bg {
    width: 100%;
    height: 100%;
}

.banner-bg-img,
.banner-bg-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent; /* 移除灰色蒙版 */
}

.banner-gradient {
    width: 100%;
    height: 100%;
    background: #f5f7fa;
}

/* 容器布局 */
.banner-container {
    height: 100%;
    position: relative;
    z-index: 10;
}

.banner-content-wrapper {
    display: flex;
    height: 100%;
    align-items: center;
}

/* 左侧导航列表 */
.banner-nav-container {
    width: 300px;
    height: auto;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 20;
    background: transparent;
}

/* 竖线分隔：高度随导航内容变化，略高一点 */
.banner-nav-container::after {
    content: '';
    position: absolute;
    right: 0;
    top: -10px;
    bottom: -10px;
    width: 1px;
    background: rgba(0, 0, 0, 0.1); /* 改为深色半透明 */
}

.banner-nav-wrapper {
    width: 100%;
    display: block;
}

.banner-nav-list {
    width: 100%;
}

.banner-nav-item {
    cursor: pointer;
    padding: 1.25rem 2rem 1.25rem 4rem; /* 增加左边距，为标签预留空间 */
    transition: all 0.3s ease;
    position: relative;
}

.banner-nav-item:hover {
    background: rgba(0, 0, 0, 0.03); /* 改为浅灰色悬浮 */
}

.banner-nav-item.active {
    background: transparent;
}

.banner-nav-content {
    display: flex;
    flex-direction: row;
    align-items: center;
    position: relative;
}

.banner-nav-tag {
    position: absolute;
    left: -3rem; /* 绝对定位到文字左侧，不占用文字空间 */
    top: 50%;
    transform: translateY(-50%);
    padding: 1px 6px;
    background: var(--color-primary-light);
    color: #fff;
    font-size: 0.7rem;
    border-radius: 3px;
    white-space: nowrap;
}

.banner-nav-text {
    color: #333; /* 改为黑色/深灰色 */
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.banner-nav-item.active .banner-nav-text {
    color: #000; /* 激活状态纯黑 */
}

.banner-nav-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: rgba(0, 0, 0, 0.05); /* 改为浅色背景 */
}

.banner-nav-progress-bar {
    width: 0;
    height: 100%;
    background: var(--color-primary-light);
}

/* 右侧文字切换区域 */
.banner-text-slider {
    flex: 1;
    height: 100%;
    position: relative;
}

.banner-text-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-left: 5rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.6s ease;
}

.banner-text-item.active {
    opacity: 1;
    visibility: visible;
}

.banner-text-area {
    color: #000; /* 字体换成黑色 */
    max-width: 800px;
    text-align: left; /* 居左 */
}

.banner-text-item.active .banner-text-area {
    animation: fadeInUp 0.8s ease forwards;
}

.banner-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: #000; /* 标题加深为纯黑 */
    text-shadow: none; /* 移除投影，适配亮色背景 */
}

.banner-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 3rem;
    color: #666; /* 描述文字深灰色 */
}

/* 按钮样式 */
.btn-banner {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 2rem;
    height: 38px; /* 再次降低高度 */
    background: var(--color-primary-light);
    color: #fff !important; /* 强制保持白色，防止被全局样式覆盖 */
    text-decoration: none;
    border-radius: 3px; /* 圆角 3px */
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-banner:hover {
    background: var(--color-primary);
    color: #fff !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 992px) {
    .banner-nav-container {
        display: none;
    }
    
    .banner-text-item {
        padding-left: 0;
    }
    
    .banner-text-area {
        text-align: center;
    }
    
    .banner-title {
        font-size: 2.25rem;
    }
}