/* ============================================
   3列文章展示组件
   缩略图3级兜底：特色图 → 内容第一张图 → 默认图
   分类标签：缩略图右上角，蓝色背景白色字体，不可单独点击
   ============================================ */
:root {
    --cx1-bg: var(--bg-card, #ffffff);
    --cx1-bg-alt: var(--bg-card-alt, rgba(0,0,0,0.03));
    --cx1-bg-hover: var(--bg-card-hover, rgba(79, 70, 229, 0.06));
    --cx1-bg-active: var(--bg-card-active, rgba(79, 70, 229, 0.05));
    --cx1-text: var(--text-color, var(--bg-card));
    --cx1-caption: var(--caption-color, var(--bg-card));
    --cx1-text-secondary: var(--text-secondary, rgba(0,0,0,0.55));
    --cx1-text-meta: var(--text-secondary, rgba(0,0,0,0.4));
    --cx1-border: var(--border-color, rgba(0,0,0,0.08));
    --cx1-primary: var(--primary-color, #4f46e5);
    --cx1-primary-light: var(--primary-color, #4f46e5);
    --cx1-primary-hover: var(--primary-color, #4f46e5);
    --cx1-shadow: var(--box-shadow, 0 2px 12px rgba(0,0,0,0.06));
    --cx1-text-on-primary: var(--text-on-primary, #ffffff);
}
@media (prefers-color-scheme: dark) {
    :root {
        --cx1-bg: var(--bg-card, var(--bg-card));
        --cx1-bg-alt: var(--bg-card-alt, rgba(255,255,255,0.05));
        --cx1-bg-hover: var(--bg-card-hover, rgba(129, 140, 248, 0.08));
        --cx1-bg-active: var(--bg-card-active, rgba(129, 140, 248, 0.08));
        --cx1-text: var(--text-color, #ffffff);
        --cx1-caption: var(--caption-color, #ffffff);
        --cx1-text-secondary: var(--text-secondary, rgba(255,255,255,0.6));
        --cx1-text-meta: var(--text-secondary, rgba(255,255,255,0.4));
        --cx1-border: var(--border-color, rgba(255,255,255,0.08));
        --cx1-primary: var(--primary-color, #818cf8);
        --cx1-primary-light: var(--primary-color, #818cf8);
        --cx1-primary-hover: var(--primary-color, #a5b4fc);
        --cx1-shadow: var(--box-shadow, 0 2px 12px rgba(0,0,0,0.2));
    }
}
[data-theme="dark"] .three-column-posts-component,
[data-mode="dark"] .three-column-posts-component,
.dark .three-column-posts-component,
.theme-dark .three-column-posts-component {
    --cx1-bg: var(--bg-card, var(--bg-card));
    --cx1-bg-alt: var(--bg-card-alt, rgba(255,255,255,0.05));
    --cx1-bg-hover: var(--bg-card-hover, rgba(129, 140, 248, 0.08));
    --cx1-bg-active: var(--bg-card-active, rgba(129, 140, 248, 0.08));
    --cx1-text: var(--text-color, #ffffff);
    --cx1-caption: var(--caption-color, #ffffff);
    --cx1-text-secondary: var(--text-secondary, rgba(255,255,255,0.6));
    --cx1-text-meta: var(--text-secondary, rgba(255,255,255,0.4));
    --cx1-border: var(--border-color, rgba(255,255,255,0.08));
    --cx1-primary: var(--primary-color, #818cf8);
    --cx1-primary-light: var(--primary-color, #818cf8);
    --cx1-primary-hover: var(--primary-color, #a5b4fc);
    --cx1-shadow: var(--box-shadow, 0 2px 12px rgba(0,0,0,0.2));
    --cx1-text-on-primary: var(--text-on-primary, #ffffff);
}
/* 组件样式 */
.three-column-posts-component {
    padding: 24px;
    background: var(--cx1-bg);
    border-radius: var(--border-radius, 16px);
    border: 1px solid var(--cx1-border);
    box-shadow: var(--cx1-shadow);
}
.three-column-posts-component .component-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--cx1-caption);
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--cx1-primary);
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.three-column-posts-component .component-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 22px;
    background: var(--cx1-primary);
    border-radius: 2px;
    flex-shrink: 0;
}
.three-column-posts-component .posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.three-column-posts-component .post-card {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    border-radius: 12px;
    overflow: hidden;
    background: var(--cx1-bg-alt);
    border: 1px solid var(--cx1-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.three-column-posts-component .post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}
/* 缩略图区域 - 永远显示（3级兜底保证有图） */
.three-column-posts-component .post-thumbnail {
    width: 100%;
    padding-top: 56.25%;
    position: relative;
    overflow: hidden;
    background: var(--cx1-bg-alt);
}
.three-column-posts-component .post-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.three-column-posts-component .post-card:hover .post-thumbnail img {
    transform: scale(1.08);
}
/* 分类标签 - 缩略图右上角，蓝色背景白色字体，不可单独点击 */
.three-column-posts-component .post-category {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    height: 24px;
    padding: 0 12px;
    font-size: 11px;
    font-weight: 700;
    color: var(--cx1-text-on-primary, #ffffff);
    background: var(--cx1-primary, #4f46e5);
    border-radius: 4px;
    letter-spacing: 0.5px;
    line-height: 1;
    cursor: default;
    pointer-events: none;
}
@media (prefers-color-scheme: dark) {
    .three-column-posts-component .post-category {
        background: var(--cx1-primary, #818cf8);
    }
}
[data-theme="dark"] .three-column-posts-component .post-category,
[data-mode="dark"] .three-column-posts-component .post-category,
.dark .three-column-posts-component .post-category,
.theme-dark .three-column-posts-component .post-category {
    background: var(--cx1-primary, #818cf8);
}
.three-column-posts-component .post-content {
    padding: 16px 14px 14px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.three-column-posts-component .post-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--cx1-text);
    margin: 0 0 8px 0;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}
.three-column-posts-component .post-card:hover .post-title {
    color: var(--cx1-primary-hover);
}
.three-column-posts-component .post-excerpt {
    font-size: 13px;
    color: var(--cx1-text-secondary);
    margin: 0 0 10px 0;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.three-column-posts-component .post-meta {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--cx1-text-meta);
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid var(--cx1-border);
}
.three-column-posts-component .post-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}
.three-column-posts-component .post-meta i {
    font-size: 14px;
    color: var(--cx1-primary);
    opacity: 0.6;
}
.three-column-posts-component .post-card.is-pinned {
    background: var(--cx1-bg-active);
    border-color: var(--cx1-primary);
    border-width: 1.5px;
}
.three-column-posts-component .post-card.is-pinned .post-title::before {
    content: '📌 ';
    font-size: 14px;
}
.three-column-posts-component .pinned-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    height: 24px;
    padding: 0 12px;
    font-size: 11px;
    font-weight: 700;
    color: var(--cx1-text-on-primary, #ffffff);
    background: var(--cx1-primary);
    border-radius: 4px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.three-column-posts-component .load-more-wrapper {
    text-align: center;
    margin-top: 28px;
}
.three-column-posts-component .load-more-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 180px;
    height: 44px;
    padding: 0 32px;
    font-size: 14px;
    font-weight: 600;
    color: var(--cx1-primary);
    background: var(--cx1-bg);
    border: 1.5px solid var(--cx1-primary);
    border-radius: 22px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 2px;
    opacity: 1;
}
.three-column-posts-component .load-more-btn:hover:not(:disabled) {
    color: var(--cx1-primary-hover);
    border-color: var(--cx1-primary);
    background: var(--cx1-bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.12);
}
.three-column-posts-component .load-more-btn:disabled {
    cursor: not-allowed;
}
.three-column-posts-component .load-more-btn.is-finished {
    color: var(--cx1-text-meta);
    background: transparent;
    border-color: var(--cx1-border);
    opacity: 0.6;
}
.three-column-posts-component .btn-loading {
    color: var(--cx1-text-meta);
}
.three-column-posts-component .btn-loading::after {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    margin-left: 8px;
    border: 2px solid var(--cx1-border);
    border-top-color: var(--cx1-primary);
    border-radius: 50%;
    animation: cx1-spin 0.6s linear infinite;
    vertical-align: middle;
}
@keyframes cx1-spin {
    to { transform: rotate(360deg); }
}
/* 响应式 */
@media (max-width: 1024px) {
    .three-column-posts-component .posts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .three-column-posts-component {
        padding: 20px;
    }
}
@media (max-width: 768px) {
    .three-column-posts-component .posts-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .three-column-posts-component {
        padding: 16px;
        border-radius: 12px;
    }
    .three-column-posts-component .post-content {
        padding: 14px 12px 12px;
    }
    .three-column-posts-component .post-title {
        font-size: 14px;
    }
    .three-column-posts-component .post-excerpt {
        font-size: 12px;
    }
    .three-column-posts-component .post-category {
        font-size: 10px;
        padding: 0 8px;
        height: 20px;
        top: 8px;
        right: 8px;
    }
    .three-column-posts-component .component-title {
        font-size: 17px;
    }
    .three-column-posts-component .load-more-btn {
        min-width: 140px;
        height: 40px;
        font-size: 13px;
    }
}