/* ================================================================
     1. 全局变量_单独放在了index的页面中。其它样式都在这里。
     ================================================================ */

/* ================================================================
     2. main 容器
     ================================================================ */
body>main {
    padding: 5px 0 48px !important;
}

main {
    display: block;
    padding: 5px 0 48px;
    font-family: -apple-system, 'PingFang SC', 'Noto Sans SC', 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
}

main .container {
    max-width: 100%;
    padding: 0 20px;
}

@media (min-width: 1200px) {
    main .container {
        max-width: 1400px;
        padding: 0 32px;
    }
}

@media (min-width: 1600px) {
    main .container {
        min-width: 1400px;
        max-width: 1560px;
        padding: 0 40px;
    }
}

@media (max-width: 768px) {
    main .container {
        padding: 0 12px;
    }
}

@media (max-width: 480px) {
    main {
        padding: 5px 0 32px;
    }

    main .container {
        padding: 0 8px;
    }
}

/* ================================================================
     3. 通用卡片
     ================================================================ */
main .card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.25s ease;
    overflow: hidden;
    margin-bottom: 6px;
}

main .card:hover {
    box-shadow: var(--shadow-md);
}

main .card-header {
    padding: 12px 18px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #fafbfc;
}

main .card-header .title {
    font-size: var(--font-base);
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

main .card-header .title i {
    color: var(--primary);
    font-size: var(--font-base);
}

main .card-header .more {
    font-size: var(--font-xs);
    color: var(--text-muted);
    font-weight: 500;
    transition: 0.2s;
    text-decoration: none;
}

main .card-header .more:hover {
    color: var(--primary);
    text-decoration: none;
}

main .card-body {
    padding: 14px 18px;
}

/* ================================================================
     4. HERO 区域 - 三列
     ================================================================ */
main .hero-section {
    display: grid;
    grid-template-columns: 1fr 2.2fr 1fr;
    gap: 8px;
    min-height: 400px;
    margin-bottom: 10px;
}

/* 4-a. 左侧banner */
main .hero-left {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 4px 0;
    height: 100%;
}

main .hero-left .banner-item {
    background: #fff;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
    overflow: hidden;
    cursor: pointer;
    transition: 0.25s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 0;
}

main .hero-left .banner-item:hover {
    box-shadow: var(--shadow-md);
}

main .hero-left .banner-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 4-b. 中部推荐文章 */
main .hero-middle {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    padding: 14px 18px 12px;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

main .hero-middle .hero-middle-title {
    font-size: var(--font-md);
    font-weight: 700;
    color: var(--primary-dark);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-light);
    margin-bottom: 8px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

main .hero-middle .hero-middle-title i {
    color: #f1c40f;
}

main .hero-middle .article-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1px;
}

main .hero-middle .article-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 3px 0;
    border-bottom: 1px solid #f5f8f6;
    font-size: var(--font-base);
    color: var(--text-primary);
    text-decoration: none;
    transition: 0.2s;
    min-width: 0;
}

main .hero-middle .article-item:last-child {
    border-bottom: none;
}

/* 第一篇特殊样式 - 高亮 */
main .hero-middle .article-item:first-child {
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    margin-bottom: 2px;
}

main .hero-middle .article-item:first-child .link {
    font-weight: 700;
    color: var(--primary-dark);
}

/* 序号样式 - 由JS控制 */
main .hero-middle .article-item .marker {
    font-size: var(--font-xs);
    font-weight: 700;
    flex-shrink: 0;
    width: 22px;
    text-align: center;
    color: var(--text-muted);
}

main .hero-middle .article-item:first-child .marker {
    color: #e67e22;
}

main .hero-middle .article-item .link {
    flex: 1;
    color: var(--text-primary);
    text-decoration: none;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 450;
    transition: 0.2s;
    font-size: var(--font-base);
}

main .hero-middle .article-item .link:hover {
    color: var(--primary);
}

main .hero-middle .article-item .date {
    font-size: var(--font-xs);
    color: var(--text-muted);
    flex-shrink: 0;
}

/* 4-c. 右侧推荐课程 */
main .hero-right {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    padding: 14px 18px 12px;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

main .hero-right .hero-right-title {
    font-size: var(--font-md);
    font-weight: 700;
    color: var(--primary-dark);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-light);
    margin-bottom: 8px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

main .hero-right .hero-right-title i {
    color: #e67e22;
}

main .hero-right .rank-list {
    flex: 1;
    display: flex;
    flex-direction: column;
}

main .hero-right .rank-item {
    display: flex;
    align-items: center;
    padding: 4px 0;
    border-bottom: 1px solid #f0f3f6;
    gap: 10px;
    min-width: 0;
}

main .hero-right .rank-item:last-child {
    border-bottom: none;
}

main .hero-right .rank-item .rank-marker {
    font-size: var(--font-xs);
    font-weight: 600;
    flex-shrink: 0;
    width: 22px;
    text-align: center;
    color: var(--text-muted);
}

main .hero-right .rank-item a {
    flex: 1;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

main .hero-right .rank-item a:hover {
    color: var(--primary);
}

/* ================================================================
     5. 最新文章列表
     ================================================================ */
main .article-entry {
    display: flex;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid #f0f3f6;
    gap: 10px;
    min-width: 0;
}

main .article-entry:last-child {
    border-bottom: none;
}

main .article-entry .link {
    flex: 1;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: 0.2s;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

main .article-entry .link:hover {
    color: var(--primary);
}

main .article-entry .meta {
    font-size: var(--font-xs);
    color: var(--text-muted);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

main .article-entry .meta i {
    font-size: var(--font-xs);
}

/* ================================================================
     6. 热门排行 (底部)
     ================================================================ */
main .rank-list .rank-item {
    display: flex;
    align-items: center;
    padding: 7px 0;
    border-bottom: 1px solid #f0f3f6;
    gap: 10px;
    min-width: 0;
}

main .rank-list .rank-item:last-child {
    border-bottom: none;
}

main .rank-list .rank-item .rank-marker {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-xs);
    font-weight: 700;
    flex-shrink: 0;
    background: #f0f2f5;
    color: var(--text-secondary);
}

main .rank-list .rank-item:nth-child(1) .rank-marker {
    background: #e67e22;
    color: #fff;
}

main .rank-list .rank-item:nth-child(2) .rank-marker {
    background: #f39c12;
    color: #fff;
}

main .rank-list .rank-item:nth-child(3) .rank-marker {
    background: #f1c40f;
    color: #333;
}

main .rank-list .rank-item a {
    flex: 1;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

main .rank-list .rank-item a:hover {
    color: var(--primary);
}

main .rank-list .rank-item .views {
    font-size: var(--font-xs);
    color: var(--text-muted);
    flex-shrink: 0;
}

/* ================================================================
     7. 主内容双栏 Grid (2.5:1)
     ================================================================ */
main .main-content-grid {
    display: grid;
    grid-template-columns: 2.5fr 1fr;
    gap: 6px;
    margin-bottom: 4px;
}

main .main-content-grid .left-col {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

main .main-content-grid .right-col {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

/* ================================================================
     8. 专栏卡片 (两列)
     ================================================================ */
main .column-grid-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

main .column-card {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    padding: 14px 16px 12px;
    transition: 0.25s;
    box-shadow: var(--shadow-sm);
    min-width: 0;
}

main .column-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

main .column-card .col-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-light);
}

main .column-card .col-head .icon-wrap {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

main .column-card .col-head .icon-wrap i {
    font-size: 15px;
    color: #fff;
}

main .column-card .col-head .col-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

main .column-card .col-head .col-info h4 {
    font-size: var(--font-md);
    font-weight: 700;
    margin: 0;
    color: var(--text-primary);
    flex-shrink: 0;
}

main .column-card .col-head .col-more {
    font-size: var(--font-xs);
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    margin-left: auto;
    padding: 2px 12px;
    border-radius: 30px;
    background: var(--bg-body);
    transition: 0.2s;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

main .column-card .col-head .col-more:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
}

main .column-card .col-head .col-more i {
    font-size: 9px;
    transition: 0.2s;
}

main .column-card .col-head .col-more:hover i {
    transform: translateX(2px);
}

main .column-card .col-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

main .column-card .col-list li {
    padding: 4px 0;
    border-bottom: 1px solid #f0f3f6;
    font-size: var(--font-base);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-width: 0;
    gap: 8px;
}

main .column-card .col-list li:last-child {
    border-bottom: none;
}

main .column-card .col-list li a {
    color: var(--text-primary);
    text-decoration: none;
    transition: 0.2s;
    font-weight: 450;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: var(--font-base);
}

main .column-card .col-list li a:hover {
    color: var(--primary);
}

main .column-card .col-list li .date {
    font-size: var(--font-xs);
    color: var(--text-muted);
    flex-shrink: 0;
}

/* ================================================================
     9. 课程专栏
     ================================================================ */
main .course-grid-2col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

main .course-item {
    cursor: pointer;
    transition: 0.25s;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: #fff;
    border: 1px solid var(--border-light);
}

main .course-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

main .course-item img {
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
    background: var(--primary-light);
}

main .course-item .course-title {
    padding: 8px 12px 10px;
    font-size: var(--font-sm);
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 44px;
}

/* ================================================================
     10. 资料下载 - 使用原有的 pv-tab 样式
     ================================================================ */
main .pv-tab {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 0;
    margin: 0 0 10px 0;
    list-style: none;
    border-bottom: 1px solid var(--border-light);
}

main .pv-tab li {
    display: inline-block;
    margin-bottom: -1px;
}

main .pv-tab li a {
    display: block;
    padding: 6px 18px;
    font-size: var(--font-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    border-bottom: none;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    text-decoration: none;
    transition: 0.2s;
    cursor: pointer;
}

main .pv-tab li a:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
}

main .pv-tab li.pv-active a {
    color: var(--primary-dark);
    background: #fff;
    border-color: var(--border-light);
    border-bottom-color: #fff;
    font-weight: 600;
}

main .pv-content .pv-pane {
    display: none;
}

main .pv-content .pv-pane.pv-active {
    display: block;
}

main .pv-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

main .pv-list li {
    display: flex;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid #f0f3f6;
    gap: 10px;
    min-width: 0;
}

main .pv-list li:last-child {
    border-bottom: none;
}

main .pv-list li .pv-link {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 0;
    color: var(--text-primary);
    text-decoration: none;
    transition: 0.2s;
}

main .pv-list li .pv-link:hover {
    color: var(--primary);
}

main .pv-list li .pv-link .pv-text {
    flex: 1;
    font-size: var(--font-base);
    font-weight: 450;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

main .pv-list li .pv-link .pv-badge {
    font-size: var(--font-xs);
    font-weight: 600;
    padding: 1px 10px;
    border-radius: 30px;
    flex-shrink: 0;
    background: var(--primary-light);
    color: var(--primary-dark);
}

main .pv-list li .pv-link .pv-badge-orange {
    background: #fef0e8;
    color: #c0392b;
}

/* 机制电价特殊样式 */
main .pv-list li .pv-link .pv-badge-price {
    background: #e8f0fe;
    color: #1a5f7a;
    font-weight: 700;
}

main .pv-list li .pv-link .pv-badge-type {
    background: #fef9e7;
    color: #b7950b;
}

main .pv-list li .pv-link .pv-badge-solar {
    background: #e8f5ee;
    color: #1a6845;
}

/* ================================================================
     11. 区块标题 H3
     ================================================================ */
main .section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 6px;
}

main .section-title h3 {
    font-weight: 700;
    font-size: var(--font-md);
    margin: 0;
    color: var(--text-primary);
}

main .section-title h3 i {
    color: var(--primary);
    margin-right: 8px;
}

main .section-title .more-link {
    font-size: var(--font-sm);
    color: var(--text-muted);
    font-weight: 500;
    text-decoration: none;
}

main .section-title .more-link:hover {
    color: var(--primary);
}

/* ================================================================
     12. 响应式
     ================================================================ */
@media (max-width: 992px) {
    main .hero-section {
        grid-template-columns: 1fr;
        height: auto;
        gap: 8px;
    }

    main .hero-left {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
        height: auto;
        padding: 0;
    }

    main .hero-left .banner-item {
        min-height: 60px;
    }

    main .hero-middle {
        height: auto;
        padding: 12px 14px;
    }

    main .hero-right {
        height: auto;
        padding: 12px 14px;
    }

    main .hero-right .rank-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0 16px;
    }

    main .main-content-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }

    main .column-grid-2col {
        grid-template-columns: 1fr 1fr;
        gap: 6px;
    }

    main .course-grid-2col {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
}

@media (max-width: 768px) {
    main {
        --font-xs: 11px;
        --font-sm: 13px;
        --font-base: 13px;
        --font-md: 15px;
        --font-lg: 17px;
    }

    /* 精选推荐文章字体 13px */
    main .hero-middle .article-item {
        font-size: var(--font-base);
        padding: 3px 0;
    }

    main .hero-middle .article-item .link {
        font-size: var(--font-base);
    }

    /* 推荐课程字体 13px */
    main .hero-right .rank-item a {
        font-size: var(--font-base);
    }

    /* 最新文章字体 13px */
    main .article-entry .link {
        font-size: var(--font-base);
    }

    /* 专题字体 13px */
    main .column-card .col-list li {
        font-size: var(--font-base);
    }

    main .column-card .col-list li a {
        font-size: var(--font-base);
    }

    /* 热门排行字体 13px */
    main .rank-list .rank-item a {
        font-size: var(--font-base);
    }

    /* 资料下载字体 13px */
    main .pv-list li .pv-link .pv-text {
        font-size: var(--font-base);
    }

    /* 资料下载移动端不分行 */
    main .pv-list li .pv-link .pv-text {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    main .hero-left {
        grid-template-columns: repeat(2, 1fr);
    }

    main .hero-left .banner-item {
        min-height: 50px;
    }

    main .hero-right .rank-list {
        grid-template-columns: 1fr;
    }

    main .hero-right .rank-item {
        padding: 4px 0;
    }

    main .column-grid-2col {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    main .column-card {
        padding: 12px 14px 10px;
    }

    main .column-card .col-head .icon-wrap {
        width: 28px;
        height: 28px;
    }

    main .column-card .col-head .icon-wrap i {
        font-size: 13px;
    }

    main .column-card .col-head .col-info h4 {
        font-size: var(--font-base);
    }

    main .course-grid-2col {
        grid-template-columns: 1fr 1fr;
        gap: 6px;
    }

    main .course-item .course-title {
        font-size: var(--font-xs);
        padding: 6px 10px 8px;
        min-height: 34px;
    }

    /* 文章条目移动端换行 */
    main .article-entry {
        flex-wrap: wrap;
        gap: 4px 8px;
        padding: 6px 0;
    }

    main .article-entry .link {
        white-space: normal;
        flex-basis: 100%;
        order: 1;
        font-size: var(--font-base);
    }

    main .article-entry .meta {
        order: 2;
        font-size: var(--font-xs);
    }

    main .card-header {
        padding: 10px 14px;
    }

    main .card-header .title {
        font-size: var(--font-base);
    }

    main .card-body {
        padding: 10px 14px;
    }

    /* 下载列表移动端 */
    main .pv-list li {
        flex-wrap: nowrap;
        gap: 6px;
    }

    main .pv-list li .pv-link .pv-badge {
        font-size: var(--font-xs);
        flex-shrink: 0;
    }

    main .pv-tab li a {
        font-size: var(--font-xs);
        padding: 4px 12px;
    }
}

@media (max-width: 480px) {
    main .hero-left {
        grid-template-columns: repeat(2, 1fr);
        gap: 4px;
    }

    main .hero-left .banner-item {
        min-height: 40px;
    }

    main .hero-middle {
        padding: 10px 12px;
    }

    main .hero-middle .hero-middle-title {
        font-size: var(--font-sm);
        margin-bottom: 6px;
        padding-bottom: 6px;
    }

    main .hero-middle .article-item {
        font-size: var(--font-sm);
        padding: 2px 0;
    }

    main .hero-middle .article-item .link {
        font-size: var(--font-sm);
    }

    main .hero-right {
        padding: 10px 12px;
    }

    main .hero-right .hero-right-title {
        font-size: var(--font-sm);
        margin-bottom: 6px;
        padding-bottom: 6px;
    }

    main .hero-right .rank-item a {
        font-size: var(--font-xs);
    }

    main .course-grid-2col {
        grid-template-columns: 1fr 1fr;
        gap: 6px;
    }

    main .course-item .course-title {
        font-size: 10px;
        padding: 4px 8px 6px;
        min-height: 28px;
    }

    main .pv-tab li a {
        font-size: var(--font-xs);
        padding: 2px 10px;
    }

    main .pv-list li .pv-link .pv-text {
        font-size: var(--font-sm);
    }

    main .column-card .col-list li {
        font-size: var(--font-sm);
    }

    main .column-card .col-list li a {
        font-size: var(--font-sm);
    }
}

/* ================================================================
     13. 图片切换
     ================================================================ */
.kctp1,
.kctp2 {
    display: none;
}

@media (min-width: 1600px) {
    .kctp1 {
        display: block;
    }
}

@media (max-width: 1599px) {
    .kctp2 {
        display: block;
    }
}

/* ================================================================
     14. 视觉隐藏
     ================================================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}