/*
@header.php  头部与首页资料区样式分离
包含首页资料区、头部、logo、返回顶部按钮等样式，原本内联于header.php。
详细注释每一部分，便于维护和定位。
*/

.site-content .homepage-materials-section {
    margin: 40px 0;
    padding: 5px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.site-content .homepage-materials-section .section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}
.site-content .homepage-materials-section .section-title {
    font-size: 24px;
    color: #333;
    margin: 0;
    position: relative;
    padding-left: 12px;
}
.site-content .homepage-materials-section .section-title:before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    height: 24px;
    width: 4px;
    background: #3976cb;
    border-radius: 2px;
}
.site-content .homepage-materials-section .view-all-btn {
    display: flex;
    align-items: center;
    color: #3976cb;
    font-size: 14px;
    text-decoration: none;
    transition: color 0.2s;
}
.site-content .homepage-materials-section .view-all-btn svg {
    margin-left: 6px;
    transition: transform 0.2s;
}
.site-content .homepage-materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}
.site-content .homepage-material-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.05);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid #f0f0f0;
}
.site-content .homepage-material-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}
.site-content .homepage-material-card .material-card-header {
    padding: 20px 20px 5px 20px;
    position: relative;
}
.site-content .homepage-material-card .material-card-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin: 0 0 8px 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}
.site-content .homepage-material-card .material-card-label {
    display: inline-block;
    background: #f5f5f5;
    color: #666;
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 12px;
    margin-bottom: 10px;
}
.site-content .homepage-material-card .material-card-content {
    flex: 1;
    padding: 0 20px 15px 20px;
}
.site-content .homepage-material-card .material-card-preview {
    border-top: 1px solid #f0f0f0;
    padding-top: 15px;
}
.site-content .homepage-material-card .preview-item {
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
}
.site-content .homepage-material-card .preview-label {
    color: #888;
    font-size: 13px;
    margin-bottom: 3px;
}
.site-content .homepage-material-card .preview-value {
    color: #333;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.site-content .homepage-material-card .material-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #f9f9f9;
    border-top: 1px solid #f0f0f0;
}
.site-content .homepage-material-card .material-card-link {
    display: flex;
    align-items: center;
    color: #3976cb;
    font-size: 14px;
    text-decoration: none;
    transition: color 0.2s;
}
.site-content .homepage-material-card .material-card-link svg {
    width: 14px;
    height: 14px;
    margin-left: 5px;
    transition: transform 0.2s;
}
.site-content .homepage-material-card .material-card-link:hover {
    color: #2c5c9c;
}
.site-content .homepage-material-card .material-card-link:hover svg {
    transform: translateX(3px);
}
.site-content .homepage-material-card .material-card-date {
    font-size: 12px;
    color: #999;
}
@media (max-width: 768px) {
    .site-content .homepage-materials-grid {
        grid-template-columns: 1fr;
    }
    .site-content . .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .site-content .homepage-materials-section .view-all-btn {
        margin-top: 10px;
    }
}
/* 返回顶部按钮样式 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background-color: #e74c3c;
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    transition: opacity 0.3s, transform 0.3s;
    opacity: 0;
    transform: translateY(20px);
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

.back-to-top:hover {
    background-color: #c0392b;
}

@media (max-width: 767px) {
    .back-to-top {
        bottom: 10px;
        right: 20px;
        width: 35px;
        height: 35px;
    }
    .back-to-top svg {
        width: 16px;
        height: 16px;
    }
}
/* 站点头部样式 */
.site-header-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    text-align: center;
}
.site-branding {
    display: flex;
    align-items: center;
    width: 100%;
    justify-content: center;
}
.site-logo {
    margin-right: 15px;
}
.site-branding img {
    max-width: 100%;
    height: auto;
    max-height: 180px;
    width: auto;
    transition: all 0.3s ease;
}
.site-title {
    font-size: 22px;
    margin: 0;
}
.site-title a {
    color: var(--text-primary);
    text-decoration: none;
}
@media (max-width: 1200px) {
    .site-branding img {
        max-height: 150px;
    }
}
@media (max-width: 992px) {
    .site-branding img {
        max-height: 130px;
    }
}
@media (max-width: 768px) {
    .site-header-inner {
        justify-content: center;
    }
    .site-branding img {
        max-height: 100px;
    }
}
@media (max-width: 576px) {
    .site-branding img {
        max-height: 80px;
    }
}