/* =========================================================
   blog.css · 博客列表页与详情页
   依赖：theme.css（深浅 token）+ app.css（顶栏/按钮/chip）
   ========================================================= */

.blog-wrap {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

/* ===== 列表页头部 ===== */
.blog-hero {
    max-width: 760px;
    margin-bottom: 2.5rem;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 1px;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
}

.blog-hero h1 {
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    line-height: 1.3;
    color: var(--text-primary);
    margin: 0 0 0.85rem;
}

.blog-hero p {
    color: var(--text-secondary);
    line-height: 1.85;
    margin: 0;
}

/* ===== 列表卡片 ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
}

.blog-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.4rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.blog-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
}

.blog-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.blog-card-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.blog-card-title {
    font-size: 1.12rem;
    line-height: 1.5;
    margin: 0;
}

.blog-card-title a {
    color: var(--text-primary);
    text-decoration: none;
}

.blog-card-title a:hover {
    color: var(--accent-primary);
}

.blog-card-summary {
    flex: 1;
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-secondary);
    /* 摘要最多 4 行，保持卡片高度整齐 */
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
}

.blog-card-tool {
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.blog-card-more {
    color: var(--accent-primary);
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}

.blog-card-more:hover {
    text-decoration: underline;
}

/* ===== 面包屑 ===== */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 1.5rem;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--accent-primary);
}

.breadcrumb-current {
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 22ch;
}

/* ===== 文章 ===== */
.article {
    max-width: 780px;
    margin: 0 auto;
}

.article-head {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.article-head h1 {
    font-size: clamp(1.5rem, 4.2vw, 2.05rem);
    line-height: 1.4;
    color: var(--text-primary);
    margin: 0 0 1rem;
    letter-spacing: -0.2px;
}

.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.article-meta .dot {
    opacity: 0.6;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

/* ===== 正文排版 ===== */
.article-body {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.9;
}

.article-body h2 {
    font-size: 1.32rem;
    line-height: 1.5;
    color: var(--text-primary);
    margin: 2.4rem 0 1rem;
    padding-left: 0.75rem;
    border-left: 3px solid var(--accent-primary);
}

.article-body h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 1.8rem 0 0.75rem;
}

.article-body p {
    margin: 1rem 0;
}

.article-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.article-body a {
    color: var(--accent-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--accent-line, rgba(37, 99, 235, 0.35));
}

.article-body a:hover {
    border-bottom-color: currentColor;
}

.article-body ul,
.article-body ol {
    padding-left: 1.4rem;
    margin: 1rem 0;
}

.article-body li {
    margin: 0.5rem 0;
}

.article-body li > ul,
.article-body li > ol {
    margin: 0.4rem 0;
}

.article-body code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    padding: 0.15em 0.4em;
    border-radius: 5px;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.article-body pre {
    margin: 1.4rem 0;
    padding: 1rem 1.1rem;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.article-body pre code {
    padding: 0;
    border: none;
    background: none;
    font-size: 0.86em;
    line-height: 1.7;
}

.article-body blockquote {
    margin: 1.4rem 0;
    padding: 0.7rem 1.1rem;
    border-left: 3px solid var(--border-strong);
    background: var(--bg-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
}

.article-body hr {
    margin: 2rem 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

.article-body img {
    max-width: 100%;
    border-radius: var(--radius-md);
}

/* FAQ：原生 details/summary */
.article-body details {
    margin: 1rem 0;
    padding: 0.9rem 1.1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
}

.article-body details:hover {
    border-color: var(--border-strong);
}

.article-body details[open] {
    background: var(--bg-secondary);
}

.article-body summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.7;
    list-style: none;
}

.article-body summary::-webkit-details-marker {
    display: none;
}

.article-body summary::before {
    content: "＋";
    display: inline-block;
    width: 1.1em;
    color: var(--accent-primary);
    font-weight: 700;
}

.article-body details[open] summary::before {
    content: "－";
}

.article-body details > p {
    margin: 0.75rem 0 0.15rem;
    font-size: 0.94rem;
    line-height: 1.85;
}

/* ===== 文末 CTA ===== */
.post-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.25rem;
    max-width: 780px;
    margin: 3rem auto 0;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.post-cta-title {
    margin: 0 0 0.35rem;
    font-weight: 700;
    color: var(--text-primary);
}

.post-cta-desc {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.post-cta-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

/* ===== 上下篇 ===== */
.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    max-width: 780px;
    margin: 1.5rem auto 0;
}

.post-nav-item {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding: 1rem 1.15rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.post-nav-item:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
}

.post-nav-item.next {
    text-align: right;
}

.post-nav-dir {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.post-nav-title {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== 页脚 ===== */
.blog-footer {
    padding: 2rem 1.5rem 3rem;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

.blog-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

.blog-footer a:hover {
    color: var(--accent-primary);
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .blog-wrap {
        padding: 1.75rem 1.15rem 3rem;
    }

    .blog-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .post-nav {
        grid-template-columns: 1fr;
    }

    .post-nav-item.next {
        text-align: left;
    }

    .post-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .post-cta-actions .btn {
        flex: 1;
    }

    .breadcrumb-current {
        max-width: 14ch;
    }
}