/* 双块交互控件样式 */
.dual-block-interactive {
    position: relative;
    display: flex;
    width: 100%;
    height: 600px;
    overflow: hidden;
    
    --overlay-width: 32%;
    --content-padding: 40px;
    gap: 1%;
}

/* 单个块样式 */
.dual-block-item {
    position: relative;
    flex: 0.4;
    display: flex;
    align-items: center;
    overflow: hidden;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}


/* 背景图片 */
.dual-block-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    object-fit: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 展开状态下的背景图片模糊效果 */
.dual-block-item.expanded .dual-block-bg {
    filter: blur(5px);
}

/* 叠加层 */
.dual-block-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 1;
}

/* 展开状态下的叠加层样式 */
.dual-block-item.expanded .dual-block-overlay {
    background: linear-gradient(180deg, #3A87AF 0%, #50A1CC 100%);
    opacity: 0.8; /* 增加一点透明度 */
}

/* 缩小状态下的叠加层完全透明 */
.dual-block-item .dual-block-overlay {
    background: transparent;
}


/* 展开状态的块菜单变成33.33%宽度 */
.dual-block-item.expanded .dual-block-menu {
    width: calc(100%);
    max-width: calc(100%);
}

/* 缩小状态的块菜单变成100%宽度 */
.dual-block-item .dual-block-menu {
    width: calc(100%) !important;
    max-width: calc(100%) !important;
}



/* 内容区域 */
.dual-block-content {
    position: relative;
    z-index: 10;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: white;
}

/* 标题区域 */
.dual-block-header {
    margin-bottom: 30px;
    padding-left: 40px;
    padding-top: 40px;
    transition: opacity 0.4s ease;
}

/* 展开状态下隐藏标题区域 */
.dual-block-item.expanded .dual-block-header {
    opacity: 0;
    visibility: hidden;
    height: 0;
    margin: 0;
    padding: 0;
}

/* 缩小状态下显示标题区域 */
.dual-block-item .dual-block-header {
    opacity: 1;
    visibility: visible;
    height: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    margin: 0;
    padding: 20px;
}

.dual-block-title {
    color: #fff;
    font-size: 1.6rem;
    font-weight: 700;
    margin: 0 0 10px 0;
    transform: translateY(20px);
    opacity: 0;
    animation: slideInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s forwards;
}

.dual-block-subtitle {
    color: #fff;
    font-size: 1rem;
    font-weight: 400;
    margin: 0;
    opacity: 0.9;
    letter-spacing: 1px;
    transform: translateY(20px);
    opacity: 0;
    animation: slideInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

.dual-block-subtitle p {
    margin: 0 0 8px 0;
}

.dual-block-subtitle p:last-child {
    margin-bottom: 0;
}

/* 菜单区域 */
.dual-block-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: calc(100% - 80px);
    max-width: calc(100% - 80px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: auto; /* 将菜单推到底部 */
    padding-bottom: 40px; /* 底部间距 */
}

/* 菜单标题 */
.dual-block-menu-title {
    border-bottom: 1px solid rgba(254, 255, 255, 0.2);
    padding-bottom: 20px;
    font-size: 1.7rem;
    font-weight: 600;
    margin: 0 0 20px 40px;
    color: white;
    opacity: 0;
    transform: translateY(20px);
    animation: slideInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.2s forwards;
}

/* 展开状态下菜单区域占据整个高度并显示 */
.dual-block-item.expanded .dual-block-menu {
    margin-top: 0;
    padding-top: 40px;
    height: 100%;
    /* justify-content: center; */
    opacity: 1;
    visibility: visible;
}

/* 缩小状态下隐藏菜单区域 */
.dual-block-item .dual-block-menu {
    opacity: 0;
    visibility: hidden;
    height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
}



/* 菜单项 */
.dual-block-menu-item {
    position: relative;
    transform: translateX(-30px);
    opacity: 0;
    animation: slideInLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.dual-block-menu-item:nth-child(1) { animation-delay: 0.6s; }
.dual-block-menu-item:nth-child(2) { animation-delay: 0.7s; }
.dual-block-menu-item:nth-child(3) { animation-delay: 0.8s; }
.dual-block-menu-item:nth-child(4) { animation-delay: 0.9s; }
.dual-block-menu-item:nth-child(5) { animation-delay: 1s; }

.dual-block-menu-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 40px;
    color: white;
    text-decoration: none;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    font-weight: 500;
}

.dual-block-menu-link:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white; 
    text-decoration: none;
}

.dual-block-menu-item.hover .dual-block-menu-link,
.dual-block-menu-item.active .dual-block-menu-link {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
}

.dual-block-menu-text {
    font-size: 1rem;
    font-weight: 500;
}

.dual-block-menu-link i {
    font-size: 0.8rem;
    opacity: 0.7;
    transition: all 0.2s ease;
}

.dual-block-menu-link:hover i {
    opacity: 1;
    /* transform: translateX(5px); */
}

/* 子菜单样式 */
.dual-block-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
}

.dual-block-menu-item.has-submenu.active .dual-block-submenu {
    max-height: 300px; /* 足够高以容纳子菜单项 */
}

.dual-block-submenu-item {
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    transition-delay: 0.1s;
}

.dual-block-menu-item.has-submenu.active .dual-block-submenu-item {
    opacity: 1;
    transform: translateY(0);
}

.dual-block-submenu-item:nth-child(2) { transition-delay: 0.15s; }
.dual-block-submenu-item:nth-child(3) { transition-delay: 0.2s; }
.dual-block-submenu-item:nth-child(4) { transition-delay: 0.25s; }
.dual-block-submenu-item:nth-child(5) { transition-delay: 0.3s; }

.dual-block-submenu-link {
    display: block;
    padding: 8px 15px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    border-radius: 4px;
}

.dual-block-submenu-item a{

    padding-left: 20px;
    margin-left: 40px;
}
.dual-block-submenu-item:hover{ 
    background: rgba(255, 255, 255, 0.15);
}

.dual-block-submenu-link:hover {
    color: white;
    text-decoration: none;
}

.dual-block-menu-item.has-submenu .dual-block-menu-link i {
    transform: rotate(0);
    transition: transform 0.3s ease;
}

.dual-block-menu-item.has-submenu.active .dual-block-menu-link i {
    transform: rotate(180deg);
}

/* 展开状态的块 */
.dual-block-item.expanded {
    flex: 1 !important;
}



/* 右侧块的菜单对齐 */
.dual-block-right .dual-block-menu {
    align-self: flex-end;
    margin-left:auto;
}

.dual-block-right .dual-block-menu-item {
    transform: translateX(30px);
}
.dual-block-right .dual-block-overlay{
    right:0;
    left: auto;
}
.dual-block-right .dual-block-header{

    width: calc(var(--overlay-width));
    max-width: calc(var(--overlay-width));
    align-self: flex-end;
    margin-left:auto;
}
.dual-block-right .dual-block-header{
    width: calc(100%);
    max-width: calc(100%);
}

/* 动画定义 */
@keyframes slideInUp {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideInLeft {
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 响应式设计 */
@media (max-width: 1280px) {
    .dual-block-interactive {
        zoom: 0.9;
    }
}
@media (max-width:1180px) {
    /* .dual-block-interactive {
        zoom: 0.88;
    } */
    .dual-block-menu{zoom: 0.92;}
    .dual-block-title {
        font-size: 1.2rem;
    }
}
@media (max-width: 992px) {
    .dual-block-interactive {
        zoom: 0.85;
        flex-direction: column;
        height: auto !important;
        min-height: 600px;
        gap: 20px;
    }
    
    .dual-block-item {
        min-height: 500px;
    }
    
    .dual-block-item.expanded {
        flex: 2 !important;
    }
    
    .dual-block-content {
        padding: 30px 20px;
    }
    
    .dual-block-title {
        font-size: 1.2rem;
    }
    
    .dual-block-menu {
        max-width: 100% !important;
        width: 100% !important;
    }
   
    
    /* 移动设备上叠加层恢复100%宽度 */
    .dual-block-overlay {
        width: 100% !important;
        left: 0 !important;
        right: auto !important;
    }
}

@media (max-width: 480px) {
    .dual-block-content {
        padding: 20px 15px;
    }
    
    .dual-block-title {
        font-size: 1.5rem;
    }
    
    .dual-block-subtitle {
        font-size: 0.9rem;
    }
    .dual-block-header{
        padding-left: 15px;
    }
    
    .dual-block-menu-link {
        padding: 12px 15px;
        font-size: 0.9rem;
    }
}