/* ============================================================
   QuickQ 文章详情页 · 现代化重设计（1920px 大气布局）
   文件：static/css/article.css
   ============================================================ */

html { background: #04060d; }
body { margin: 0; }

.page-shell {
    width: 100%;
    max-width: 1920px;
    margin: 0 auto;
    background: #080c17;
    position: relative;
    overflow-x: clip;
    box-shadow: 0 0 120px rgba(0, 0, 0, 0.6);
}

.main-article {
    --at-bg-base:    #080c17;
    --at-bg-dark:    #0b1220;
    --at-bg-card:    #0f1830;
    --at-border:        rgba(255, 255, 255, 0.07);
    --at-border-strong: rgba(255, 255, 255, 0.12);
    --at-primary:      #4f7cff;
    --at-primary-dark: #2c58d9;
    --at-accent:       #6b9bff;
    --at-cyan:         #22d3ee;
    --at-green:        #4ade80;
    --at-gold:         #f5a623;
    --at-text:       #e6ecf7;
    --at-text-muted: #98a4bc;
    --at-text-dim:   #5f6c85;
    --at-radius:    18px;
    --at-radius-sm: 10px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---------- 三层容器 ---------- */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 2.5rem;
    padding-right: 2.5rem;
    box-sizing: border-box;
}
.container-wide   { max-width: 1680px; }
.container-base   { max-width: 1360px; }
.container-narrow { max-width: 1000px; }

@media (max-width: 1440px) {
    .container-wide { max-width: 1440px; }
    .container-base { max-width: 1280px; }
}
@media (max-width: 1024px) {
    .container { padding-left: 1.5rem; padding-right: 1.5rem; }
    .container-wide,
    .container-base,
    .container-narrow { max-width: 100%; }
}
@media (max-width: 520px) {
    .container { padding-left: 1rem; padding-right: 1rem; }
}

.main-article .gradient-text {
    background: linear-gradient(135deg, #6b9bff 0%, #22d3ee 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 4px 24px rgba(79, 124, 255, 0.25));
}

/* ============================================================
   1. 阅读进度条
   ============================================================ */
.reading-progress {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: rgba(255, 255, 255, 0.05);
    z-index: 9999;
    pointer-events: none;
}
.reading-progress-bar {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--at-primary), var(--at-cyan));
    box-shadow: 0 0 12px rgba(79, 124, 255, 0.6);
    transition: width 0.1s linear;
}

/* ============================================================
   2. 面包屑
   ============================================================ */
.main-article .breadcrumb-nav {
    background: var(--at-bg-base);
    border-bottom: 1px solid var(--at-border);
    padding: 1rem 0;
    font-size: 0.82rem;
}
.main-article .breadcrumb-list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
    color: var(--at-text-dim);
}
.main-article .breadcrumb-list a {
    color: var(--at-text-muted);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: color 0.2s;
}
.main-article .breadcrumb-list a:hover { color: var(--at-accent); }
.main-article .breadcrumb-list a i { font-size: 0.7rem; }
.main-article .breadcrumb-list .sep {
    color: #334155;
    font-size: 0.6rem;
}
.main-article .breadcrumb-list li[aria-current="page"] {
    color: #fff;
    font-weight: 500;
    max-width: 420px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ============================================================
   3. 文章布局（侧栏 TOC + 正文）
   ============================================================ */
.main-article .article-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 4rem;
    padding-top: 5rem;
    padding-bottom: 5rem;
    align-items: stretch;          /* ★ 关键修复：从 start 改为 stretch，
                                      让侧栏高度撑满整个网格行，sticky 才有足够范围 */
}
@media (max-width: 1024px) {
    .main-article .article-layout {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        padding-top: 3rem;
        padding-bottom: 3rem;
    }
}

/* ---------- 侧栏 TOC ---------- */
.main-article .article-aside {
    position: relative;
    height: 100%;                  /* ★ 撑满 grid 行高 */
    min-height: 0;
}
.main-article .toc-sticky {
    position: sticky;
    top: 90px;                     /* 距顶 90px（配合 header 高度） */
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-height: calc(100vh - 110px);   /* ★ 一屏内滚动 */
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(79, 124, 255, 0.35) transparent;
    /* 平滑滚动视觉效果 */
    scroll-behavior: smooth;
    padding-right: 4px;            /* 给滚动条留位置 */
}
.main-article .toc-sticky::-webkit-scrollbar {
    width: 4px;
}
.main-article .toc-sticky::-webkit-scrollbar-track {
    background: transparent;
}
.main-article .toc-sticky::-webkit-scrollbar-thumb {
    background: rgba(79, 124, 255, 0.35);
    border-radius: 2px;
}
.main-article .toc-sticky::-webkit-scrollbar-thumb:hover {
    background: rgba(79, 124, 255, 0.55);
}

/* ---------- TOC 导航卡片 ---------- */
.main-article .toc-nav {
    background: linear-gradient(180deg, rgba(15, 24, 48, 0.75) 0%, rgba(15, 24, 48, 0.45) 100%);
    border: 1px solid var(--at-border-strong);
    border-radius: var(--at-radius);
    padding: 1.5rem 1.3rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}
.main-article .toc-title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 0.82rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid var(--at-border);
    letter-spacing: 0.3px;
}
.main-article .toc-title i {
    color: var(--at-accent);
    font-size: 0.85rem;
}
.main-article .toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.main-article .toc-list li { list-style: none; }
.main-article .toc-list a {
    display: block;
    padding: 0.5rem 0.75rem 0.5rem 1.1rem;
    color: var(--at-text-muted);
    font-size: 0.82rem;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
    line-height: 1.45;
    position: relative;
}
.main-article .toc-list a::before {
    content: '';
    position: absolute;
    left: 0.35rem;
    top: 0.85rem;
    width: 4px; height: 4px;
    border-radius: 50%;
    background: #46536b;
    transition: all 0.2s;
}
.main-article .toc-list a:hover {
    color: #fff;
    background: rgba(79, 124, 255, 0.08);
}
.main-article .toc-list a:hover::before {
    background: var(--at-accent);
    box-shadow: 0 0 8px var(--at-accent);
}
.main-article .toc-list a.active {
    color: #fff;
    background: linear-gradient(90deg, rgba(79, 124, 255, 0.18) 0%, rgba(79, 124, 255, 0.04) 100%);
    font-weight: 600;
}
.main-article .toc-list a.active::before {
    background: var(--at-accent);
    box-shadow: 0 0 8px var(--at-accent);
    width: 5px; height: 5px;
    top: 0.8rem;
}
/* 三级目录缩进 */
.main-article .toc-list a.toc-h3 { padding-left: 2rem; font-size: 0.78rem; }
.main-article .toc-list a.toc-h3::before { left: 1.25rem; width: 3px; height: 3px; }

/* ---------- 侧栏 CTA 卡片 ---------- */
.main-article .aside-card {
    background: linear-gradient(135deg, rgba(79, 124, 255, 0.12) 0%, rgba(34, 211, 238, 0.05) 100%);
    border: 1px solid rgba(79, 124, 255, 0.25);
    border-radius: var(--at-radius);
    padding: 1.5rem 1.3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;              /* ★ 不被压缩 */
}
.main-article .aside-card::before {
    content: '';
    position: absolute;
    top: -40%; right: -30%;
    width: 200px; height: 200px;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.15), transparent 70%);
    pointer-events: none;
}
.main-article .aside-icon {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px; height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(79, 124, 255, 0.28), rgba(34, 211, 238, 0.18));
    border: 1px solid rgba(79, 124, 255, 0.30);
    color: #a3c2ff;
    font-size: 1.2rem;
    margin-bottom: 0.9rem;
    box-shadow: 0 8px 24px rgba(79, 124, 255, 0.30);
}
.main-article .aside-title {
    position: relative;
    font-size: 0.92rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.3rem;
}
.main-article .aside-desc {
    position: relative;
    font-size: 0.72rem;
    color: var(--at-text-dim);
    line-height: 1.5;
    margin-bottom: 1rem;
}
.main-article .aside-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 100%;
    padding: 0.65rem 1.2rem;
    background: linear-gradient(135deg, var(--at-primary), var(--at-primary-dark));
    color: #fff;
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 999px;
    transition: all 0.3s;
    box-shadow: 0 6px 20px rgba(79, 124, 255, 0.30);
}
.main-article .aside-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(79, 124, 255, 0.45);
}



/* ---------- 正文 ---------- */
.main-article .article-main {
    min-width: 0;
    max-width: 900px;
}
@media (max-width: 1024px) {
    .main-article .article-main { max-width: 100%; }
}

/* 文章头 */
.main-article .article-head {
    padding-bottom: 2.2rem;
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--at-border);
}
.main-article .article-cat {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--at-accent);
    background: rgba(79, 124, 255, 0.12);
    padding: 0.35rem 0.95rem;
    border-radius: 999px;
    border: 1px solid rgba(79, 124, 255, 0.20);
    margin-bottom: 1.3rem;
    letter-spacing: 0.3px;
}
.main-article .article-cat i { font-size: 0.65rem; }

.main-article .article-title {
    font-size: clamp(1.8rem, 3.4vw, 2.8rem);
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    letter-spacing: -0.025em;
    margin: 0 0 1.4rem;
}

.main-article .article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem 2rem;
    align-items: center;
    font-size: 0.85rem;
    color: var(--at-text-dim);
    margin-bottom: 1.5rem;
}
.main-article .meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.main-article .meta-item i {
    color: var(--at-accent);
    font-size: 0.85rem;
}

.main-article .article-summary {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--at-text-muted);
    padding: 1.2rem 1.5rem;
    background: linear-gradient(135deg, rgba(79, 124, 255, 0.06), rgba(34, 211, 238, 0.03));
    border-left: 3px solid var(--at-primary);
    border-radius: 0 10px 10px 0;
    margin: 0;
    font-style: italic;
}

/* 封面 */
.main-article .article-cover {
    width: 100%;
    margin: 0 0 3rem;
    border-radius: var(--at-radius);
    overflow: hidden;
    border: 1px solid var(--at-border-strong);
    background: var(--at-bg-card);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}
.main-article .article-cover img {
    width: 100%;
    height: auto;
    display: block;
}

/* ============================================================
   4. 正文排版（阅读体验）
   ============================================================ */
.main-article .article-content {
    font-size: 1.05rem;
    line-height: 1.9;
    color: #d6dce8;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* 段落 */
.main-article .article-content p {
    margin: 0 0 1.4rem;
}

/* 标题 */
.main-article .article-content h2 {
    font-size: 1.65rem;
    font-weight: 800;
    color: #fff;
    margin: 3.5rem 0 1.4rem;
    letter-spacing: -0.02em;
    line-height: 1.35;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--at-border);
    position: relative;
}
.main-article .article-content h2::before {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--at-primary), var(--at-cyan));
    border-radius: 3px;
}
.main-article .article-content h3 {
    font-size: 1.28rem;
    font-weight: 700;
    color: #fff;
    margin: 2.4rem 0 1rem;
    letter-spacing: -0.01em;
    line-height: 1.4;
    padding-left: 0.9rem;
    border-left: 3px solid rgba(79, 124, 255, 0.5);
}
.main-article .article-content h4 {
    font-size: 1.08rem;
    font-weight: 700;
    color: #eaf0ff;
    margin: 1.8rem 0 0.8rem;
    line-height: 1.4;
}

/* 列表 */
.main-article .article-content ul,
.main-article .article-content ol {
    padding-left: 1.5rem;
    margin: 0 0 1.4rem;
}
.main-article .article-content li {
    margin: 0.5rem 0;
    line-height: 1.85;
}
.main-article .article-content ul li::marker {
    color: var(--at-accent);
}
.main-article .article-content ol li::marker {
    color: var(--at-accent);
    font-weight: 700;
}

/* 链接 */
.main-article .article-content a {
    color: var(--at-accent);
    text-decoration: none;
    border-bottom: 1px dashed rgba(79, 124, 255, 0.5);
    transition: all 0.2s;
    font-weight: 500;
}
.main-article .article-content a:hover {
    color: #fff;
    border-bottom-style: solid;
    border-bottom-color: #fff;
}

/* 图片 / 视频 */
.main-article .article-content img,
.main-article .article-content video {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 1.5rem 0;
    display: block;
    border: 1px solid var(--at-border);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

/* 引用 */
.main-article .article-content blockquote {
    position: relative;
    border-left: 3px solid var(--at-primary);
    background: linear-gradient(135deg, rgba(79, 124, 255, 0.08) 0%, rgba(79, 124, 255, 0.02) 100%);
    padding: 1.2rem 1.5rem 1.2rem 1.8rem;
    margin: 1.8rem 0;
    color: var(--at-text-muted);
    border-radius: 0 12px 12px 0;
    font-style: italic;
    font-size: 1rem;
    line-height: 1.85;
}
.main-article .article-content blockquote::before {
    content: '\201C';
    position: absolute;
    top: 0.3rem;
    left: 0.5rem;
    font-family: Georgia, serif;
    font-size: 3rem;
    line-height: 1;
    color: rgba(79, 124, 255, 0.25);
}
.main-article .article-content blockquote p:last-child { margin-bottom: 0; }

/* 代码 */
.main-article .article-content code {
    background: rgba(79, 124, 255, 0.10);
    color: #8ab4ff;
    padding: 2px 7px;
    border-radius: 5px;
    font-size: 0.9em;
    font-family: 'SF Mono', 'Menlo', 'Consolas', monospace;
    border: 1px solid rgba(79, 124, 255, 0.15);
}
.main-article .article-content pre {
    background: #0d1729;
    border: 1px solid var(--at-border-strong);
    color: #d6dce8;
    padding: 1.2rem 1.5rem;
    border-radius: 12px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    line-height: 1.7;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}
.main-article .article-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    border: none;
}

/* 表格 */
.main-article .article-content table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 1.8rem 0;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--at-border-strong);
    font-size: 0.92rem;
}
.main-article .article-content th,
.main-article .article-content td {
    padding: 0.85rem 1.2rem;
    text-align: left;
    border-bottom: 1px solid var(--at-border);
}
.main-article .article-content th {
    background: rgba(15, 24, 48, 0.75);
    color: #fff;
    font-weight: 700;
    font-size: 0.88rem;
}
.main-article .article-content tr:last-child td {
    border-bottom: none;
}
.main-article .article-content tbody tr:hover td {
    background: rgba(79, 124, 255, 0.04);
}

/* 分隔线 */
.main-article .article-content hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--at-border-strong), transparent);
    margin: 3rem 0;
}

/* ============================================================
   5. 分享 & 导航
   ============================================================ */
.main-article .article-share {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 3.5rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--at-border);
    border-bottom: 1px solid var(--at-border);
}
.main-article .share-label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--at-text-muted);
}
.main-article .share-buttons {
    display: flex;
    gap: 0.6rem;
}
.main-article .share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(15, 24, 48, 0.6);
    border: 1px solid var(--at-border-strong);
    color: var(--at-text-muted);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.25s;
    text-decoration: none;
    font-family: inherit;
}
.main-article .share-btn:hover {
    transform: translateY(-3px);
    color: #fff;
}
.main-article .share-btn.twitter:hover { background: #1da1f2; border-color: #1da1f2; }
.main-article .share-btn.facebook:hover { background: #1877f2; border-color: #1877f2; }
.main-article .share-btn.weibo:hover { background: #e6162d; border-color: #e6162d; }
.main-article .share-btn.copy:hover { background: var(--at-primary); border-color: var(--at-primary); }

.main-article .article-nav {
    display: flex;
    justify-content: center;
    margin-top: 2.5rem;
}
.main-article .back-to-list {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 2rem;
    background: rgba(15, 24, 48, 0.6);
    border: 1px solid var(--at-border-strong);
    color: var(--at-text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 999px;
    transition: all 0.3s;
}
.main-article .back-to-list:hover {
    color: #fff;
    border-color: var(--at-primary);
    background: rgba(79, 124, 255, 0.10);
    transform: translateX(-4px);
}

/* ============================================================
   6. 相关文章
   ============================================================ */
.main-article .related-section {
    background: var(--at-bg-dark);
    padding: 6rem 0;
    border-top: 1px solid var(--at-border);
}
.main-article .related-header {
    text-align: center;
    margin-bottom: 3rem;
}
.main-article .section-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    background: rgba(79, 124, 255, 0.10);
    border: 1px solid rgba(79, 124, 255, 0.22);
    border-radius: 999px;
    padding: 0.4rem 1.15rem;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--at-accent);
    letter-spacing: 0.6px;
    margin-bottom: 1.2rem;
}
.main-article .related-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.025em;
    margin: 0;
    line-height: 1.15;
}
.main-article .related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
}
@media (max-width: 1024px) { .main-article .related-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .main-article .related-grid { grid-template-columns: 1fr; } }

.main-article .related-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, rgba(15, 24, 48, 0.75) 0%, rgba(15, 24, 48, 0.35) 100%);
    backdrop-filter: blur(8px);
    border: 1px solid var(--at-border-strong);
    border-radius: var(--at-radius);
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.34, 1.3, 0.64, 1);
}
.main-article .related-card:hover {
    transform: translateY(-8px);
    border-color: rgba(79, 124, 255, 0.45);
    box-shadow: 0 28px 64px rgba(0, 0, 0, 0.5);
}
.main-article .related-img {
    position: relative;
    height: 180px;
    overflow: hidden;
    background: #0f1a30;
}
.main-article .related-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(6, 11, 24, 0.7) 0%, transparent 55%);
    pointer-events: none;
}
.main-article .related-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s cubic-bezier(0.34, 1.3, 0.64, 1);
}
.main-article .related-card:hover .related-img img { transform: scale(1.08); }

.main-article .related-body {
    display: flex;
    flex-direction: column;
    padding: 1.3rem 1.4rem 1.2rem;
    flex: 1;
}
.main-article .related-body .tag {
    display: inline-flex;
    align-self: flex-start;
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--at-accent);
    background: rgba(79, 124, 255, 0.10);
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    border: 1px solid rgba(79, 124, 255, 0.18);
    margin-bottom: 0.7rem;
}
.main-article .related-body h3 {
    margin: 0 0 0.5rem;
    font-size: 0.98rem;
    line-height: 1.45;
    font-weight: 700;
}
.main-article .related-body h3 a {
    color: #fff;
    text-decoration: none;
    transition: color 0.2s;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.main-article .related-body h3 a:hover { color: var(--at-accent); }
.main-article .related-body p {
    color: var(--at-text-muted);
    font-size: 0.85rem;
    line-height: 1.7;
    flex: 1;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.main-article .related-loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 1rem;
    color: var(--at-text-dim);
    font-size: 0.95rem;
}
.main-article .related-loading i {
    color: var(--at-accent);
    margin-right: 0.5rem;
}

/* ============================================================
   7. CTA
   ============================================================ */
.main-article .article-cta {
    background: var(--at-bg-base);
    padding: 6rem 0 7rem;
    position: relative;
    overflow: hidden;
    isolation: isolate;
}
.main-article .article-cta .glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(130px);
    pointer-events: none;
    z-index: 0;
}
.main-article .article-cta .glow-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(79, 124, 255, 0.28), transparent 70%);
    top: -100px; left: 10%;
    animation: atFloatGlow 14s ease-in-out infinite;
}
.main-article .article-cta .glow-2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.15), transparent 70%);
    bottom: -100px; right: 10%;
    animation: atFloatGlow 16s ease-in-out infinite reverse;
}
@keyframes atFloatGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50%      { transform: translate(30px, -20px) scale(1.08); }
}
.main-article .cta-box {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 3.5rem 2rem;
    background: linear-gradient(180deg, rgba(15, 24, 48, 0.75), rgba(15, 24, 48, 0.45));
    border: 1px solid var(--at-border-strong);
    border-radius: 22px;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}
.main-article .cta-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px; height: 64px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(79, 124, 255, 0.25), rgba(34, 211, 238, 0.15));
    border: 1px solid rgba(79, 124, 255, 0.30);
    color: #a3c2ff;
    font-size: 1.7rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 12px 40px rgba(79, 124, 255, 0.30);
}
.main-article .cta-box h3 {
    font-size: clamp(1.4rem, 2.6vw, 1.9rem);
    font-weight: 800;
    color: #fff;
    margin: 0 0 0.8rem;
    letter-spacing: -0.02em;
}
.main-article .cta-box p {
    color: var(--at-text-muted);
    font-size: 0.98rem;
    margin: 0 0 2rem;
    line-height: 1.8;
}
.main-article .btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--at-primary), var(--at-primary-dark));
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    padding: 0.95rem 2.4rem;
    border-radius: 999px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 10px 32px rgba(79, 124, 255, 0.35);
    letter-spacing: 0.3px;
}
.main-article .btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 48px rgba(79, 124, 255, 0.55);
}

/* ============================================================
   8. 响应式
   ============================================================ */
@media (max-width: 1024px) {
    .main-article .article-aside { display: none; }
    .main-article .article-main {
        max-width: 900px;
        margin: 0 auto;
    }
}

@media (max-width: 820px) {
    .main-article .article-layout {
        padding-top: 2.5rem;
        padding-bottom: 2.5rem;
    }
    .main-article .article-head { padding-bottom: 1.8rem; margin-bottom: 2rem; }
    .main-article .article-title { font-size: 1.6rem; }
    .main-article .article-summary { padding: 1rem 1.2rem; font-size: 0.94rem; }
    .main-article .article-cover { margin-bottom: 2rem; }
    .main-article .article-content { font-size: 1rem; }
    .main-article .article-content h2 { font-size: 1.4rem; margin-top: 2.5rem; }
    .main-article .article-content h3 { font-size: 1.15rem; margin-top: 2rem; }
    .main-article .related-section { padding: 4rem 0; }
    .main-article .article-cta { padding: 4rem 0 4.5rem; }
    .main-article .cta-box { padding: 2.5rem 1.5rem; }
}

@media (max-width: 520px) {
    .main-article .breadcrumb-nav { font-size: 0.72rem; }
    .main-article .article-title { font-size: 1.4rem; }
    .main-article .article-meta { gap: 0.8rem 1.3rem; font-size: 0.78rem; }
    .main-article .article-summary { font-size: 0.88rem; padding: 0.9rem 1rem; }
    .main-article .article-content {
        font-size: 0.95rem;
        line-height: 1.85;
    }
    .main-article .article-content h2 { font-size: 1.25rem; margin: 2rem 0 1rem; }
    .main-article .article-content h3 { font-size: 1.05rem; margin: 1.6rem 0 0.8rem; }
    .main-article .article-content pre { padding: 1rem; font-size: 0.82rem; }
    .main-article .article-content blockquote { padding: 1rem 1.2rem 1rem 1.5rem; font-size: 0.92rem; }
    .main-article .article-content table { font-size: 0.82rem; }
    .main-article .article-content th,
    .main-article .article-content td { padding: 0.65rem 0.8rem; }
    .main-article .article-share { padding: 1.2rem 0; }
    .main-article .share-btn { width: 36px; height: 36px; font-size: 0.85rem; }
    .main-article .related-section { padding: 3rem 0; }
    .main-article .related-img { height: 160px; }
    .main-article .cta-box { padding: 2rem 1.3rem; }
    .main-article .cta-icon { width: 54px; height: 54px; font-size: 1.4rem; }
    .main-article .btn-cta { padding: 0.85rem 2rem; font-size: 0.92rem; }
}

/* 打印 */
@media print {
    .main-article .article-aside,
    .main-article .reading-progress,
    .main-article .article-share,
    .main-article .article-cta,
    .main-article .related-section,
    .main-article .breadcrumb-nav,
    .main-article .backfab { display: none !important; }
    .main-article .article-layout { grid-template-columns: 1fr; }
    .main-article .article-title { color: #000; }
    .main-article .article-content { color: #333; }
}