/* 合作单位页面样式 */

/* 栏目图区域响应式适配 */
.about-banner-section {
    width: 100%;
}

.about-banner-image {
    width: 100%;
    height: 400px;
    overflow: hidden;
    position: relative;
}

.about-banner-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

/* 主要内容区域 */
.cooperation-main {
    padding: 60px 0;
    background-color: #f8f9fa;
    min-height: 60vh;
}

/* 合作单位展示区域 */
.cooperation-section {
    margin-bottom: 40px;
}

/* 合作单位网格布局 */
.cooperation-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 合作单位项目 */
.cooperation-item {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    border-radius: 12px;
    padding: 30px 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    min-height: 120px;
}

.cooperation-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* 合作单位logo */
.cooperation-logo {
    max-width: 228px;
    max-height: 61px;
    width: auto;
    height: auto;
    object-fit: contain;
    transition: all 0.3s ease;
}

.cooperation-item:hover .cooperation-logo {
    transform: scale(1.05);
}

/* 平板端适配 (768px - 1024px) */
@media (max-width: 1024px) {
    /* 栏目图区域平板适配 */
    .about-banner-image {
        height: 300px;
    }
    .cooperation-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px 25px;
        padding: 0 15px;
    }
    
    .cooperation-item {
        padding: 25px 15px;
        min-height: 100px;
    }
    
    .cooperation-logo {
        max-width: 200px;
        max-height: 55px;
    }
}

/* 超小屏手机端适配 (最大360px) */
@media (max-width: 360px) {
    /* 栏目图区域超小屏适配 */
    .about-banner-image {
        height: 180px;
    }
    
    .cooperation-main {
        padding: 25px 0;
    }
    
    .cooperation-grid {
        padding: 0 10px;
        gap: 12px;
    }
    
    .cooperation-item {
        padding: 20px 10px;
        min-height: 75px;
    }
    
    .cooperation-logo {
        max-width: 180px;
        max-height: 50px;
    }
}

/* 手机端适配 (最大768px) */
@media (max-width: 768px) {
    /* 栏目图区域手机端适配 */
    .about-banner-image {
        height: 250px;
    }
    
    .cooperation-main {
        padding: 40px 0;
    }
    
    .cooperation-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px 15px;
        padding: 0 10px;
    }
    
    .cooperation-item {
        padding: 20px 10px;
        min-height: 80px;
        border-radius: 8px;
    }
    
    .cooperation-logo {
        max-width: 160px;
        max-height: 45px;
    }
}

/* 小屏手机端适配 (最大480px) */
@media (max-width: 480px) {
    /* 栏目图区域小屏手机适配 */
    .about-banner-image {
        height: 200px;
    }
    
    .cooperation-main {
        padding: 30px 0;
    }
    
    .cooperation-grid {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 0 15px;
    }
    
    .cooperation-item {
        padding: 25px 15px;
        min-height: 90px;
    }
    
    .cooperation-logo {
        max-width: 200px;
        max-height: 55px;
    }
}

/* 超小屏手机端适配 (最大360px) */
@media (max-width: 360px) {
    /* 栏目图区域超小屏适配 */
    .about-banner-image {
        height: 180px;
    }
    
    .cooperation-main {
        padding: 25px 0;
    }
    
    .cooperation-grid {
        padding: 0 10px;
        gap: 12px;
    }
    
    .cooperation-item {
        padding: 20px 10px;
        min-height: 75px;
    }
    
    .cooperation-logo {
        max-width: 180px;
        max-height: 50px;
    }
}

/* 加载动画效果 */
.cooperation-item {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.cooperation-item:nth-child(1) { animation-delay: 0.1s; }
.cooperation-item:nth-child(2) { animation-delay: 0.2s; }
.cooperation-item:nth-child(3) { animation-delay: 0.3s; }
.cooperation-item:nth-child(4) { animation-delay: 0.4s; }
.cooperation-item:nth-child(5) { animation-delay: 0.5s; }
.cooperation-item:nth-child(6) { animation-delay: 0.6s; }
.cooperation-item:nth-child(7) { animation-delay: 0.7s; }
.cooperation-item:nth-child(8) { animation-delay: 0.8s; }
.cooperation-item:nth-child(9) { animation-delay: 0.9s; }
.cooperation-item:nth-child(10) { animation-delay: 1.0s; }
.cooperation-item:nth-child(11) { animation-delay: 1.1s; }
.cooperation-item:nth-child(12) { animation-delay: 1.2s; }

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