/**
 * 子分类目录导航样式
 * 用于 AI 技术等含子目录的分类页与文章页
 */

/* 面包屑 */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1.5rem;
    padding: 0.75rem 1rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.breadcrumb a {
    color: #667eea;
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb-sep {
    color: #bbb;
}

.breadcrumb-current {
    color: #333;
    font-weight: 500;
}

/* 子分类导航卡片 */
.subcategory-nav {
    margin: 2rem 0;
    padding: 1.5rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid #e8ecf4;
}

.subcategory-nav-title {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
    color: #333;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #667eea;
}

.subcategory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
}

.subcategory-card {
    display: block;
    padding: 1.25rem;
    background: linear-gradient(135deg, #f8f9ff 0%, #fff 100%);
    border: 1px solid #e0e6f5;
    border-radius: 10px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.subcategory-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
    border-color: #667eea;
}

.subcategory-card-icon {
    font-size: 1.75rem;
    display: block;
    margin-bottom: 0.5rem;
}

.subcategory-card h3 {
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.subcategory-card p {
    font-size: 0.875rem;
    color: #666;
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.subcategory-card-meta {
    display: inline-block;
    font-size: 0.8rem;
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    margin-bottom: 0.5rem;
}

.subcategory-card-link {
    display: block;
    font-size: 0.85rem;
    color: #667eea;
    font-weight: 500;
}

/* 分类页子分组 */
.subcategory-section {
    margin: 2.5rem 0;
    padding: 1.5rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.subcategory-section > h2 {
    font-size: 1.35rem;
    color: #333;
    margin-bottom: 0.5rem;
    padding-left: 0.75rem;
    border-left: 4px solid #667eea;
}

.subcategory-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.subcategory-section-link {
    font-size: 0.9rem;
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.subcategory-section-link:hover {
    text-decoration: underline;
}

/* 文章页双栏布局 */
.post-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 2rem;
    align-items: start;
}

.post-sidebar {
    position: sticky;
    top: 1.5rem;
    background: #fff;
    border-radius: 10px;
    padding: 1.25rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border: 1px solid #e8ecf4;
}

.post-sidebar-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #667eea;
}

.series-nav {
    list-style: none;
    margin: 0;
    padding: 0;
}

.series-nav li {
    margin-bottom: 0.35rem;
}

.series-nav a {
    display: block;
    padding: 0.45rem 0.6rem;
    font-size: 0.85rem;
    color: #555;
    text-decoration: none;
    border-radius: 6px;
    line-height: 1.4;
    transition: background 0.2s, color 0.2s;
}

.series-nav a:hover {
    background: #f0f3ff;
    color: #667eea;
}

.series-nav a.is-current {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    font-weight: 500;
}

.post-main {
    min-width: 0;
}

/* 子分类索引页 */
.subcategory-index .subcategory-desc {
    font-size: 1.05rem;
    color: #666;
    margin-bottom: 1.5rem;
}

@media (max-width: 900px) {
    .post-layout {
        grid-template-columns: 1fr;
    }

    .post-sidebar {
        position: static;
        order: -1;
    }

    .subcategory-grid {
        grid-template-columns: 1fr;
    }
}

@media (prefers-color-scheme: dark) {
    .breadcrumb,
    .subcategory-nav,
    .subcategory-section,
    .post-sidebar,
    .subcategory-card {
        background: #2d2d2d;
        border-color: #444;
        color: #e0e0e0;
    }

    .breadcrumb-current,
    .subcategory-card h3,
    .subcategory-section > h2,
    .post-sidebar-title {
        color: #e0e0e0;
    }

    .subcategory-card {
        background: linear-gradient(135deg, #2a2a3a 0%, #2d2d2d 100%);
    }

    .subcategory-card p,
    .breadcrumb {
        color: #aaa;
    }

    .series-nav a {
        color: #ccc;
    }

    .series-nav a:hover {
        background: #3a3a4a;
        color: #a0b0ff;
    }
}