.page-header {
    background: var(--primary);
    padding: 132px 0 40px;
    margin-top: -72px;
    text-align: center;
}
.page-title {
    font-size: 24px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}
.breadcrumb-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
}
.article-breadcrumb-a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
}
.article-breadcrumb-a:hover { color: #fff; }
.article-breadcrumb-sep { color: rgba(255,255,255,0.5); }
.article-breadcrumb-current { color: rgba(255,255,255,0.9); }

.article-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 32px;
    align-items: start;
}
@media (max-width: 900px) {
    .article-layout { grid-template-columns: 1fr; }
    .article-sidebar { display: none; }
}
@media (max-width: 768px) {
    .page-header { display: none; }
}

.article-main {
    min-width: 0;
    background: #fff;
    border-radius: 16px;
    padding: 16px 20px;
    box-shadow: var(--shadow);
}

.article-detail-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--gray-200);
}
.article-detail-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 13px;
    font-weight: 500;
    border-radius: 4px;
    margin-bottom: 14px;
}
.article-detail-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.4;
    margin-bottom: 16px;
}
.article-detail-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 14px;
    color: var(--gray-500);
}
.article-detail-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-detail-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-700);
}
.article-detail-content h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--gray-900);
    margin: 36px 0 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-light);
}
.article-detail-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin: 28px 0 12px;
}
.article-detail-content p { margin-bottom: 18px; }
.article-detail-content ul,
.article-detail-content ol {
    margin-bottom: 18px;
    padding-left: 24px;
}
.article-detail-content li { margin-bottom: 6px; }
.article-detail-content pre {
    background: var(--gray-900);
    color: #fff;
    padding: 20px;
    border-radius: 12px;
    overflow-x: auto;
    margin-bottom: 20px;
}
.article-detail-content code {
    font-family: 'SF Mono', Monaco, Consolas, monospace;
    font-size: 14px;
}
.article-detail-content :not(pre) > code {
    background: var(--gray-100);
    color: var(--primary);
    padding: 2px 6px;
    border-radius: 4px;
}
.article-detail-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 20px 0;
}
.article-detail-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 12px 20px;
    margin: 20px 0;
    background: var(--primary-light);
    border-radius: 0 8px 8px 0;
    color: var(--gray-600);
}

.article-nav {
    display: flex;
    gap: 16px;
    margin: 40px 0 24px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}
.article-nav-item {
    flex: 1;
    padding: 16px;
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    text-decoration: none;
    transition: var(--transition);
}
.article-nav-item:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}
.article-nav-label {
    font-size: 12px;
    color: var(--gray-400);
    margin-bottom: 6px;
}
.article-nav-title {
    font-size: 14px;
    color: var(--gray-700);
    font-weight: 500;
}

.article-detail-more { margin-top: 8px; }

/* 侧边栏 */
.article-sidebar { position: sticky; top: 90px; }
.sidebar-card {
    background: #fff;
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow);
}
.sidebar-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
}
.article-toc a {
    display: block;
    font-size: 13px;
    color: var(--gray-600);
    text-decoration: none;
    padding: 5px 0;
    border-bottom: 1px solid var(--gray-100);
    transition: color 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.article-toc a:hover { color: var(--primary); }
.article-toc a.toc-h3 { padding-left: 12px; font-size: 12px; }
.sidebar-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 9px 14px;
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-fast);
}
.sidebar-action-primary {
    background: var(--primary);
    color: #fff;
}
.sidebar-action-primary:hover { background: var(--primary-hover); color: #fff; }
.sidebar-action-ghost {
    background: var(--gray-50);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}
.sidebar-action-ghost:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.sidebar-related-item {
    display: block;
    font-size: 13px;
    color: var(--gray-700);
    text-decoration: none;
    padding: 7px 0;
    border-bottom: 1px solid var(--gray-100);
    line-height: 1.5;
    transition: color 0.2s;
}
.sidebar-related-item:last-child { border-bottom: none; }
.sidebar-related-item:hover { color: var(--primary); }

.loading-placeholder {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }