/* ==========================================================================
   Business School Page (Design B - Tab + Waterfall)
   依赖: style.css (基础重置)
   设计令牌: 继承首页 desktop.css 的 --navy / --blue / --blue-dark / --cyan 等
   ========================================================================== */

/* ==========================================================================
   1. CSS Variables — 对齐首页设计令牌
   同时作用于 .bs-page（列表页）和 .bs-detail（详情页），
   确保详情页也有完整的变量定义，不会变成无样式白板。
   ========================================================================== */
.bs-page, .bs-detail {
    --bs-primary: var(--blue, #1266e3);
    --bs-primary-dark: var(--blue-dark, #0b4ab2);
    --bs-navy: var(--navy, #071a3a);
    --bs-cyan: var(--cyan, #22c7e8);
    --bs-gold: var(--gold, #f5b84b);
    --bs-bg: var(--soft, #f5f8fc);
    --bs-card: #ffffff;
    --bs-text: var(--text, #10213f);
    --bs-muted: var(--muted, #65728a);
    --bs-line: var(--line, #e6edf7);
    --bs-shadow: var(--shadow, 0 18px 45px rgba(17, 48, 96, .10));
    --bs-radius: 8px;
    --bs-max: 1180px;
    background: var(--bs-bg);
    color: var(--bs-text);
    font-family: inherit;
}

/* ==========================================================================
   2. Hero — 顶部英雄区域
   ========================================================================== */
.bs-hero {
    background:
        radial-gradient(circle at 90% 0%, rgba(18, 102, 227, .08), transparent 50%),
        radial-gradient(circle at 0% 100%, rgba(34, 199, 232, .06), transparent 50%),
        linear-gradient(180deg, #ffffff 0%, var(--bs-bg) 100%);
    padding: 110px 0 60px;
    border-bottom: 1px solid var(--bs-line);
}
.bs-hero .container {
    width: min(var(--bs-max), calc(100% - 48px));
    margin: 0 auto;
    padding: 0;
}

.bs-eyebrow {
    display: inline-block;
    font-size: 12px;
    letter-spacing: 2px;
    font-weight: 700;
    color: var(--bs-primary);
    background: rgba(18, 102, 227, .08);
    padding: 6px 14px;
    border-radius: 99px;
    margin-bottom: 20px;
}
.bs-title {
    font-size: 48px;
    line-height: 1.2;
    font-weight: 800;
    margin: 0 0 16px;
    letter-spacing: -.02em;
    color: var(--bs-navy);
}
.bs-subtitle {
    font-size: 17px;
    line-height: 1.65;
    color: var(--bs-muted);
    margin: 0 0 36px;
    max-width: 720px;
}

/* ==========================================================================
   3. Search — 搜索框
   ========================================================================== */
.bs-search {
    position: relative;
    max-width: 680px;
    background: #fff;
    border: 1px solid var(--bs-line);
    border-radius: var(--bs-radius);
    display: flex;
    align-items: center;
    padding: 6px 6px 6px 18px;
    box-shadow: 0 12px 30px -18px rgba(17, 48, 96, .15);
    margin-bottom: 0;
}
.bs-search-icon {
    width: 18px; height: 18px;
    color: var(--bs-muted);
    flex-shrink: 0;
}
.bs-search input {
    flex: 1;
    border: 0;
    outline: 0;
    padding: 14px 12px;
    font-size: 15px;
    background: transparent;
    color: var(--bs-text);
    font-family: inherit;
}
.bs-search input::placeholder { color: #9CA3AF; }
.bs-search-btn {
    border: 0;
    background: linear-gradient(135deg, var(--bs-primary), var(--bs-primary-dark));
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    padding: 12px 26px;
    border-radius: 6px;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease;
    font-family: inherit;
    box-shadow: 0 14px 28px rgba(18, 102, 227, .22);
}
.bs-search-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 32px rgba(18, 102, 227, .30);
}

/* ==========================================================================
   4. Content — 主内容区
   ========================================================================== */
.bs-content { padding: 60px 0 100px; }
.bs-content .container {
    width: min(var(--bs-max), calc(100% - 48px));
    margin: 0 auto;
    padding: 0;
}

/* ==========================================================================
   5. Tabs — 内容类型切换
   ========================================================================== */
.bs-tabs {
    display: flex;
    gap: 4px;
    background: #fff;
    border: 1px solid var(--bs-line);
    padding: 6px;
    border-radius: var(--bs-radius);
    margin-bottom: 24px;
    overflow-x: auto;
    scrollbar-width: none;
    box-shadow: 0 6px 20px -12px rgba(17, 48, 96, .08);
}
.bs-tabs::-webkit-scrollbar { display: none; }
.bs-tab {
    border: 0;
    background: transparent;
    padding: 12px 22px;
    font-size: 15px;
    font-weight: 700;
    color: var(--bs-muted);
    border-radius: 6px;
    cursor: pointer;
    transition: all .2s ease;
    white-space: nowrap;
    font-family: inherit;
}
.bs-tab:hover {
    color: var(--bs-primary);
    background: rgba(18, 102, 227, .04);
}
.bs-tab.is-active {
    background: linear-gradient(135deg, var(--bs-primary), var(--bs-primary-dark));
    color: #fff;
    box-shadow: 0 8px 20px -8px rgba(18, 102, 227, .45);
}

/* ==========================================================================
   6. Filters — 平台 + 行业筛选
   ========================================================================== */
.bs-filters {
    background: #fff;
    border: 1px solid var(--bs-line);
    border-radius: var(--bs-radius);
    padding: 22px 24px;
    margin-bottom: 36px;
    box-shadow: 0 6px 20px -12px rgba(17, 48, 96, .08);
}
.bs-filter-row {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 16px;
}
.bs-filter-row:last-child { margin-bottom: 0; }
.bs-filter-row.bs-filter-industry { align-items: flex-start; }

.bs-filter-label {
    display: flex; align-items: center; gap: 6px;
    flex-shrink: 0;
    width: 60px;
    font-size: 13px;
    font-weight: 700;
    color: var(--bs-text);
    padding-top: 8px;
}
.bs-filter-label i { width: 16px; height: 16px; }

.bs-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    flex: 1;
}
.bs-pill {
    border: 1px solid var(--bs-line);
    background: #fff;
    color: var(--bs-muted);
    font-size: 13px;
    font-weight: 600;
    padding: 7px 16px;
    border-radius: 99px;
    cursor: pointer;
    transition: all .18s ease;
    font-family: inherit;
}
.bs-pill:hover {
    color: var(--bs-primary);
    border-color: rgba(18, 102, 227, .35);
    background: rgba(18, 102, 227, .03);
}
.bs-pill.is-active {
    background: linear-gradient(135deg, var(--bs-primary), var(--bs-primary-dark));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 6px 16px -6px rgba(18, 102, 227, .40);
}
.bs-pill-parent { font-weight: 700; }
.bs-pill-child  { font-size: 12px; padding: 5px 12px; }
.bs-pill-arrow {
    width: 14px; height: 14px; margin-left: 4px;
    transition: transform .2s ease;
}
.bs-pill-parent.is-expanded .bs-pill-arrow { transform: rotate(180deg); }

/* 行业筛选区 — 两级布局 */
.bs-industry-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0;
}
.bs-industry-main {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}
.bs-industry-main .bs-pill {
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
}
.bs-industry-sub {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    padding: 10px 14px;
    margin-top: 8px;
    background: var(--bs-bg);
    border: 1px solid var(--bs-line);
    border-radius: 6px;
    animation: bs-sub-slide .25s ease;
}
@keyframes bs-sub-slide {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.bs-industry-sub-label {
    font-size: 12px;
    color: var(--bs-muted);
    white-space: nowrap;
    margin-right: 4px;
}
.bs-industry-sub-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    flex: 1;
}
.bs-industry-sub-list .bs-pill {
    font-size: 13px;
    padding: 5px 14px;
    background: #fff;
    border: 1px solid var(--bs-line);
    color: var(--bs-muted);
    border-radius: 99px;
    cursor: pointer;
    transition: all .15s ease;
}
.bs-industry-sub-list .bs-pill:hover {
    border-color: var(--bs-primary);
    color: var(--bs-primary);
    background: rgba(18, 102, 227, .03);
}
.bs-industry-sub-list .bs-pill.is-active {
    background: var(--bs-primary);
    color: #fff;
    border-color: transparent;
}

/* ==========================================================================
   7. Grid — 瀑布流卡片列表
   ========================================================================== */
.bs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.bs-card {
    break-inside: avoid;
    margin-bottom: 24px;
    background: var(--bs-card);
    border: 1px solid var(--bs-line);
    border-radius: var(--bs-radius);
    overflow: hidden;
    display: block;
    width: 100%;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    box-shadow: 0 6px 20px -12px rgba(17, 48, 96, .06);
}
.bs-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--bs-shadow);
    border-color: rgba(18, 102, 227, .20);
}
.bs-card[hidden] { display: none; }

/* 卡片入场动画 */
.bs-card-enter {
    animation: bs-card-fade-in .5s ease forwards;
    opacity: 0;
}
@keyframes bs-card-fade-in {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.bs-card-thumb {
    position: relative;
    display: block;
    overflow: hidden;
    background: var(--bs-bg);
    aspect-ratio: 16/9;        /* 新增：固定16:9 */
}
.bs-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .35s ease;
}
.bs-card:hover .bs-card-thumb img { transform: scale(1.04); }
.bs-card-thumb-placeholder {
    aspect-ratio: 16/9;
    display: flex; align-items: center; justify-content: center;
    color: #C5CAD6;
    background: linear-gradient(135deg, var(--bs-bg), #eef2f8);
}
.bs-card-thumb-placeholder i { width: 48px; height: 48px; }
.bs-card-type {
    position: absolute;
    top: 12px; left: 12px;
    background: var(--accent, var(--bs-primary));
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 99px;
    box-shadow: 0 4px 12px -4px rgba(17, 48, 96, .30);
}

.bs-card-body { padding: 20px 22px 22px; }

.bs-card-meta {
    display: flex; align-items: center; gap: 10px;
    margin-bottom: 10px;
    color: var(--bs-muted);
    font-size: 12px;
}
.bs-meta-duration, .bs-meta-level {
    display: inline-flex; align-items: center; gap: 4px;
}
.bs-meta-duration i { width: 13px; height: 13px; }
.bs-meta-level {
    background: rgba(18, 102, 227, .08);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--bs-primary);
    font-weight: 600;
}
.bs-meta-level.bs-level-入门 { background: #E6F7EE; color: #16A34A; }
.bs-meta-level.bs-level-基础 { background: rgba(18, 102, 227, .08); color: var(--bs-primary); }
.bs-meta-level.bs-level-进阶 { background: #FEF3E2; color: #D97706; }
.bs-meta-level.bs-level-高级 { background: #FEE2E2; color: #DC2626; }

.bs-card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.45;
    margin: 0 0 10px;
    color: var(--bs-navy);
}
.bs-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color .15s ease;
}
.bs-card-title a:hover { color: var(--bs-primary); }

.bs-card-excerpt {
    font-size: 13.5px;
    line-height: 1.7;
    color: var(--bs-muted);
    margin: 0 0 14px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.bs-card-tags {
    display: flex; flex-wrap: wrap; gap: 6px;
    margin-bottom: 14px;
}
.bs-tag {
    font-size: 11.5px;
    padding: 3px 10px;
    background: var(--bs-bg);
    color: var(--bs-muted);
    border-radius: 4px;
    font-weight: 500;
}
.bs-tag-platform {
    background: rgba(18, 102, 227, .08);
    color: var(--bs-primary);
}

.bs-card-footer {
    display: flex; align-items: center; justify-content: space-between;
    padding-top: 14px;
    border-top: 1px dashed var(--bs-line);
    font-size: 12px;
    color: var(--bs-muted);
}
.bs-read-more {
    display: inline-flex; align-items: center; gap: 4px;
    color: var(--bs-primary);
    font-weight: 700;
    text-decoration: none;
    font-size: 13px;
    transition: gap .15s ease;
}
.bs-read-more i { width: 14px; height: 14px; }
.bs-read-more:hover { gap: 8px; }

/* ==========================================================================
   8. Empty State — 空状态
   ========================================================================== */
.bs-empty {
    column-span: all;
    text-align: center;
    padding: 80px 24px;
    background: #fff;
    border: 1px dashed var(--bs-line);
    border-radius: var(--bs-radius);
    color: var(--bs-muted);
}
.bs-empty i { width: 48px; height: 48px; color: #C5CAD6; margin-bottom: 12px; }
.bs-empty p { font-size: 15px; margin: 0; }

/* ==========================================================================
   9. Load More — 加载更多按钮
   ========================================================================== */
.bs-load-more { text-align: center; margin-top: 40px; }
.bs-btn-load {
    border: 1px solid var(--bs-line);
    background: #fff;
    color: var(--bs-primary);
    font-size: 14px;
    font-weight: 700;
    padding: 14px 42px;
    border-radius: 99px;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    font-family: inherit;
}
.bs-btn-load:hover {
    background: linear-gradient(135deg, var(--bs-primary), var(--bs-primary-dark));
    color: #fff;
    border-color: transparent;
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(18, 102, 227, .22);
}
.bs-btn-load[disabled] { opacity: .6; cursor: not-allowed; transform: none; box-shadow: none; }

/* ==========================================================================
   10. Scroll Animation — 滚动入场动画（对齐首页）
   渐进增强策略：默认所有 data-reveal 元素完全可见（避免 JS 异常/未加载时空白），
   只有当 JS 主动添加 .bs-reveal-init 类后，元素才进入"待显现"状态。
   这样无论 JS 是否执行成功，内容始终对用户可见。
   ========================================================================== */
.bs-page [data-reveal] {
    /* 默认完全可见，确保空白页问题不再发生 */
    opacity: 1;
    transform: none;
}
/* JS 启用滚动动画后，元素默认隐藏，等 IntersectionObserver 触发后再显示 */
.bs-page.bs-reveal-init [data-reveal]:not(.is-visible) {
    opacity: 0;
    transform: translateY(34px);
    transition: opacity .75s ease, transform .75s cubic-bezier(.2, .7, .2, 1);
}
.bs-page [data-reveal].is-visible {
    opacity: 1 !important;
    transform: none !important;
}
/* 兜底：JS 异常时 4 秒后强制所有未显示元素可见 */
@keyframes bs-reveal-fallback {
    to { opacity: 1; transform: none; }
}
.bs-page.bs-reveal-init [data-reveal]:not(.is-visible) {
    animation: bs-reveal-fallback 0s 4s forwards;
}

@media (prefers-reduced-motion: reduce) {
    .bs-page [data-reveal],
    .bs-page.bs-reveal-init [data-reveal]:not(.is-visible) {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
        animation: none !important;
    }
    .bs-card-enter {
        animation: none;
        opacity: 1;
    }
    .bs-industry-sub {
        animation: none;
    }
}

/* ==========================================================================
   11. Responsive — 响应式
   ========================================================================== */
@media (max-width: 1100px) {
    .bs-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
    .bs-hero { padding: 80px 0 40px; }
    .bs-hero .container, .bs-content .container { width: calc(100% - 36px); }
    .bs-title { font-size: 32px; }
    .bs-subtitle { font-size: 15px; }
    .bs-content { padding: 40px 0 60px; }
    .bs-grid { grid-template-columns: 1fr; }
    .bs-filter-row { flex-direction: column; gap: 8px; }
    .bs-filter-label { width: auto; padding-top: 0; }
    .bs-tab { padding: 10px 16px; font-size: 14px; }
    .bs-filters { padding: 18px 16px; }
    .bs-industry-sub { padding: 8px 10px; }
    .bs-industry-sub-label { display: block; width: 100%; margin-bottom: 4px; }
}

/* ==========================================================================
   12. Single Lesson Detail Page — 课程详情页
   ========================================================================== */
.bs-detail { background: var(--bs-bg); padding-top: 82px; padding-bottom: 80px; }
.bs-detail .container {
    width: min(var(--bs-max), calc(100% - 48px));
    margin: 0 auto;
    padding: 0;
}

.bs-detail-bread {
    padding: 24px 0;
    border-bottom: 1px solid var(--bs-line);
    background: #fff;
}
.bs-detail-bread a { color: var(--bs-muted); text-decoration: none; transition: color .15s ease; }
.bs-detail-bread a:hover { color: var(--bs-primary); }
.bs-detail-bread .current { color: var(--bs-text); font-weight: 600; }

.bs-detail-main { padding: 48px 0; }
.bs-detail-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: flex-start;
}

.bs-detail-content {
    background: #fff;
    border: 1px solid var(--bs-line);
    border-radius: var(--bs-radius);
    padding: 40px 48px;
    box-shadow: 0 6px 20px -12px rgba(17, 48, 96, .06);
    max-width: 820px;
    margin: 0 auto;
}

.bs-detail-meta {
    display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
    margin-bottom: 18px;
    font-size: 13px;
    color: var(--bs-muted);
}
.bs-tag-type {
    background: var(--bs-primary);
    color: #fff;
    padding: 4px 12px;
    border-radius: 99px;
    font-weight: 700;
    font-size: 12px;
}
.bs-meta-duration, .bs-meta-level, .bs-meta-time {
    display: inline-flex; align-items: center; gap: 4px;
}
.bs-meta-duration i { width: 13px; height: 13px; }
.bs-meta-level {
    background: rgba(18, 102, 227, .08);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--bs-primary);
    font-weight: 600;
}

.bs-detail-title {
    font-size: 36px;
    line-height: 1.32;
    font-weight: 800;
    color: var(--bs-navy);
    margin: 0 0 28px;
    letter-spacing: -.01em;
}

.bs-detail-hero {
    margin: 0 0 32px;
    border-radius: var(--bs-radius);
    overflow: hidden;
}
.bs-detail-hero img { width: 100%; height: auto; display: block; }

.bs-detail-body {
    font-size: 16px;
    line-height: 1.85;
    color: #2A2F3C;
}
.bs-detail-body h2 { font-size: 26px; font-weight: 700; margin: 36px 0 16px; color: var(--bs-navy); }
.bs-detail-body h3 { font-size: 20px; font-weight: 700; margin: 28px 0 12px; color: var(--bs-navy); }
.bs-detail-body p  { margin: 0 0 16px; }
.bs-detail-body ul, .bs-detail-body ol { padding-left: 24px; margin: 0 0 16px; }
.bs-detail-body li { margin-bottom: 6px; }
.bs-detail-body blockquote {
    border-left: 4px solid var(--bs-primary);
    background: rgba(18, 102, 227, .04);
    padding: 16px 20px;
    margin: 24px 0;
    color: #455066;
    border-radius: 0 6px 6px 0;
}
.bs-detail-body img { max-width: 100% !important; width: auto !important; height: auto; border-radius: 6px; margin: 16px 0; }
.bs-detail-body figure,
.bs-detail-body .wp-block-image { margin: 16px 0; width: fit-content !important; max-width: 100%; display: table; }
.bs-detail-body figure img,
.bs-detail-body .wp-block-image img { width: auto !important; max-width: 100% !important; }
.bs-detail-body .aligncenter,
.bs-detail-body .aligncenter img { margin-left: auto; margin-right: auto; }
.bs-detail-body code {
    background: var(--bs-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 14px;
    color: #C7254E;
}
.bs-detail-body pre {
    background: var(--bs-navy);
    color: #E2E8F0;
    padding: 16px 20px;
    border-radius: 6px;
    overflow-x: auto;
}
.bs-detail-body pre code { background: transparent; color: inherit; padding: 0; }
.bs-detail-body a { color: var(--bs-primary); text-decoration: underline; text-underline-offset: 3px; }

.bs-detail-tags {
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px dashed var(--bs-line);
    display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
    font-size: 13px;
}
.bs-detail-tags-label { color: var(--bs-muted); margin-right: 4px; }

.bs-detail-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--bs-line);
}
.bs-pager-prev, .bs-pager-next { min-height: 1px; }
.bs-detail-pager a {
    display: flex; flex-direction: column;
    gap: 6px;
    padding: 14px 18px;
    background: var(--bs-bg);
    border: 1px solid var(--bs-line);
    border-radius: 6px;
    text-decoration: none;
    transition: all .15s ease;
}
.bs-pager-prev a:hover, .bs-pager-next a:hover {
    background: #fff;
    border-color: var(--bs-primary);
    box-shadow: 0 6px 16px -8px rgba(18, 102, 227, .20);
}
.bs-pager-next a { text-align: right; }
.bs-detail-pager span { font-size: 12px; color: var(--bs-muted); }
.bs-detail-pager strong { font-size: 14px; color: var(--bs-text); font-weight: 600; line-height: 1.5; }

/* ==========================================================================
   13. Sidebar — 详情页侧边栏
   ========================================================================== */
.bs-detail-aside { display: flex; flex-direction: column; gap: 18px; max-width: 820px; margin: 0 auto; width: 100%; }
.bs-aside-card {
    background: #fff;
    border: 1px solid var(--bs-line);
    border-radius: var(--bs-radius);
    padding: 24px;
    box-shadow: 0 6px 20px -12px rgba(17, 48, 96, .06);
}
/* 桌面端：隐藏 CTA 板块（用户不需要右侧推广卡片） */
.bs-aside-cta {
    display: none;
}
.bs-aside-cta h3 { font-size: 20px; font-weight: 700; margin: 0 0 10px; line-height: 1.4; }
.bs-aside-cta p { font-size: 13.5px; line-height: 1.6; opacity: .9; margin: 0 0 18px; }
.bs-aside-btn {
    display: inline-block;
    background: #fff;
    color: var(--bs-primary);
    padding: 10px 22px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 14px;
    text-decoration: none;
    transition: transform .15s ease;
}
.bs-aside-btn:hover { transform: translateY(-1px); }

.bs-aside-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--bs-navy);
    margin: 0 0 14px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--bs-line);
}
.bs-aside-related { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.bs-aside-related a {
    display: flex; gap: 12px;
    padding: 14px;
    border: 1px solid var(--bs-line);
    border-radius: 8px;
    background: #fff;
    text-decoration: none;
    color: var(--bs-text);
    transition: all .15s ease;
}
.bs-aside-related a:hover { border-color: var(--bs-primary); box-shadow: 0 6px 16px -8px rgba(18,102,227,.15); }
.bs-aside-related a:hover strong { color: var(--bs-primary); }
.bs-aside-thumb {
    flex-shrink: 0;
    width: 64px; height: 64px;
    border-radius: 6px;
    overflow: hidden;
    background: var(--bs-bg);
}
.bs-aside-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.bs-aside-info { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.bs-aside-info strong {
    font-size: 13.5px; font-weight: 600; line-height: 1.5;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.bs-aside-info small {
    font-size: 12px; color: var(--bs-muted); line-height: 1.5;
    display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}

/* ==========================================================================
   14. 回到顶部按钮
   ========================================================================== */
.bs-back-top {
    position: fixed;
    right: 32px;
    bottom: 48px;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--bs-primary, #1266e3);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(18, 102, 227, .30);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity .25s ease, transform .25s ease, visibility .25s;
    z-index: 999;
}
.bs-back-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.bs-back-top:hover {
    background: var(--bs-primary-dark, #0b4ab2);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(18, 102, 227, .40);
}
.bs-back-top i { width: 20px; height: 20px; }

@media (max-width: 980px) {
    .bs-back-top { right: 16px; bottom: calc(80px + env(safe-area-inset-bottom)); width: 40px; height: 40px; }
    .bs-back-top i { width: 18px; height: 18px; }
}

@media (max-width: 980px) {
    .bs-detail-layout { grid-template-columns: 1fr; gap: 24px; }
    .bs-detail-content { padding: 24px 20px; max-width: 100%; }
    .bs-detail-aside { max-width: 100%; position: static; }
    .bs-aside-related { grid-template-columns: 1fr; }
    .bs-detail-title { font-size: 24px; margin-bottom: 20px; }

    /* === 移动端 CTA 板块：显示并添加边框和底色 === */
    .bs-aside-cta {
        display: block;
        background: linear-gradient(135deg, #071a3a, #0b4ab2);
        border: 1px solid rgba(18, 102, 227, .15);
        border-radius: 10px;
        padding: 20px 22px;
        margin-top: 8px;
        color: #fff;
        box-shadow: 0 6px 20px -8px rgba(7, 26, 58, .25);
    }
    .bs-aside-cta h3 { font-size: 17px; margin-bottom: 8px; color: #fff; }
    .bs-aside-cta p { font-size: 13px; margin-bottom: 14px; opacity: .88; }
    .bs-aside-btn {
        padding: 9px 20px;
        font-size: 13px;
    }

    /* === 移动端正文排版优化（参考飞书文档阅读体验） === */
    .bs-detail-body {
        font-size: 15px;
        line-height: 1.8;
        color: #1f2329;
        word-break: break-word;
        overflow-wrap: break-word;
    }
    .bs-detail-body h2 {
        font-size: 20px;
        font-weight: 700;
        margin: 28px 0 12px;
        line-height: 1.4;
    }
    .bs-detail-body h3 {
        font-size: 17px;
        font-weight: 700;
        margin: 22px 0 10px;
        line-height: 1.4;
    }
    .bs-detail-body p {
        margin: 0 0 14px;
    }
    .bs-detail-body ul,
    .bs-detail-body ol {
        padding-left: 20px;
        margin: 0 0 14px;
    }
    .bs-detail-body li {
        margin-bottom: 6px;
        line-height: 1.75;
    }
    .bs-detail-body blockquote {
        margin: 16px 0;
        padding: 12px 16px;
        font-size: 14px;
    }
    .bs-detail-body img {
        max-width: 100% !important;
        width: auto !important;
        height: auto;
        border-radius: 6px;
        margin: 12px 0;
    }
    .bs-detail-body code {
        font-size: 13px;
        padding: 1px 5px;
        word-break: break-all;
    }
    .bs-detail-body pre {
        font-size: 13px;
        padding: 12px 14px;
        border-radius: 6px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .bs-detail-body table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
    }

    /* 移动端面包屑和分页优化 */
    .bs-detail-bread { font-size: 12px; flex-wrap: wrap; padding: 0 0 12px; margin-bottom: 16px; }
    .bs-detail-main { padding: 28px 0; }
    .bs-detail-pager {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .bs-pager-next a { text-align: left; }
    .bs-detail-pager a { padding: 12px 14px; }
    .bs-detail-pager strong { font-size: 13px; }

    /* 移动端详情页 meta 区域 */
    .bs-detail-meta { gap: 8px; font-size: 12px; margin-bottom: 14px; }
    .bs-detail-tags { margin-top: 24px; padding-top: 18px; gap: 6px; }
}