/* ── Learn 知识库 ── */

/* ── 首页 Hero ───────────────────────────────────────────────── */
.learn-hero {
    background: linear-gradient(135deg, #fff7f4 0%, #fff 100%);
    padding: 60px 0 48px;
    text-align: center;
    border-bottom: 1px solid #f0f0f0;
}
.learn-hero-title {
    font-size: 36px;
    font-weight: 700;
    color: #101828;
    margin-bottom: 8px;
}
.learn-hero-sub {
    font-size: 16px;
    color: #667085;
    margin-bottom: 32px;
}

/* ── 首页分类卡片 ────────────────────────────────────────────── */
.learn-page { background: #fafafa; min-height: 100vh; }
.learn-container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

.learn-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 48px 0 60px;
}
.learn-category-card {
    background: #fff;
    border: 1px solid #e8e8e8;
    border-radius: 12px;
    padding: 28px 24px;
    text-decoration: none;
    display: block;
    transition: box-shadow .2s, border-color .2s, transform .2s;
    cursor: pointer;
}
.learn-category-card:hover {
    box-shadow: 0 8px 24px rgba(0,0,0,.08);
    border-color: #FF7744;
    transform: translateY(-2px);
    text-decoration: none;
}
.learn-cat-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: #fff7f4;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 22px;
}
.learn-cat-name {
    font-size: 16px;
    font-weight: 600;
    color: #101828;
    margin-bottom: 6px;
}
.learn-cat-desc {
    font-size: 13px;
    color: #667085;
    line-height: 1.6;
    margin-bottom: 16px;
}
.learn-cat-count {
    font-size: 12px;
    color: #FF7744;
    font-weight: 500;
}

/* ── 文章页布局 ──────────────────────────────────────────────── */
.learn-article-page {
    display: flex;
    align-items: flex-start;
    max-width: 1080px;
    margin: 0 auto;
    padding: 40px 24px 80px;
    gap: 48px;
}

/* 左侧导航 */
.learn-sidebar {
    width: 220px;
    flex-shrink: 0;
    position: sticky;
    top: 20px;
}
.learn-sidebar-back {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: #667085;
    text-decoration: none;
    margin-bottom: 20px;
    padding: 0 4px;
}
.learn-sidebar-back:hover { color: #FF7744; text-decoration: none; }
.learn-sidebar-cat-title {
    font-size: 11px;
    font-weight: 600;
    color: #aaa;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
    padding: 0 8px;
}
.learn-sidebar-list {
    list-style: none;
    padding: 0;
    margin: 0 0 28px;
}
.learn-sidebar-list li a {
    display: block;
    padding: 8px 12px;
    font-size: 13px;
    color: #444;
    border-radius: 6px;
    text-decoration: none;
    transition: background .15s, color .15s;
    line-height: 1.5;
}
.learn-sidebar-list li a:hover { background: #fff7f4; color: #FF7744; text-decoration: none; }
.learn-sidebar-list li a.active { background: #fff7f4; color: #FF7744; font-weight: 600; }

.learn-sidebar-divider { border: none; border-top: 1px solid #eee; margin: 16px 0; }

.learn-all-cats-title {
    font-size: 11px;
    font-weight: 600;
    color: #aaa;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
    padding: 0 8px;
}
.learn-all-cats-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.learn-all-cats-list li a {
    display: block;
    padding: 6px 12px;
    font-size: 12px;
    color: #667085;
    border-radius: 6px;
    text-decoration: none;
    transition: background .15s, color .15s;
}
.learn-all-cats-list li a:hover { background: #f7f7f7; color: #333; text-decoration: none; }
.learn-all-cats-list li a.active-cat { color: #FF7744; font-weight: 600; }

/* 文章主体 */
.learn-content { flex: 1; min-width: 0; }

.learn-breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: #999;
    margin-bottom: 28px;
    flex-wrap: wrap;
}
.learn-breadcrumb a { color: #999; text-decoration: none; }
.learn-breadcrumb a:hover { color: #FF7744; }
.learn-breadcrumb span { color: #ccc; }

.learn-article-title {
    font-size: 28px;
    font-weight: 700;
    color: #101828;
    margin-bottom: 24px;
    line-height: 1.3;
}
.learn-article-body {
    font-size: 15px;
    color: #344054;
    line-height: 1.8;
}
.learn-article-body h2 {
    font-size: 20px;
    font-weight: 600;
    color: #101828;
    margin: 36px 0 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid #f0f0f0;
}
.learn-article-body h3 {
    font-size: 16px;
    font-weight: 600;
    color: #1d2939;
    margin: 24px 0 10px;
}
.learn-article-body p { margin-bottom: 16px; }
.learn-article-body ul, .learn-article-body ol {
    padding-left: 20px;
    margin-bottom: 16px;
}
.learn-article-body li { margin-bottom: 6px; }
.learn-article-body strong { color: #101828; }
.learn-article-body a { color: #FF7744; text-decoration: none; }
.learn-article-body a:hover { text-decoration: underline; }
.learn-article-body blockquote {
    border-left: 3px solid #FF7744;
    padding: 12px 16px;
    background: #fff7f4;
    border-radius: 0 6px 6px 0;
    margin: 20px 0;
    color: #555;
}
.learn-highlight-box {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 8px;
    padding: 16px 20px;
    margin: 20px 0;
    font-size: 14px;
    color: #0369a1;
}
.learn-tip-box {
    background: #fff7f4;
    border: 1px solid #fed7c3;
    border-radius: 8px;
    padding: 16px 20px;
    margin: 20px 0;
    font-size: 14px;
    color: #c2410c;
}

/* 文章底部 CTA */
.learn-article-footer {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid #f0f0f0;
}
.learn-cta-btn {
    display: inline-block;
    padding: 12px 28px;
    background: #FF7744;
    color: #fff;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: background .15s;
}
.learn-cta-btn:hover { background: #e5622e; color: #fff; text-decoration: none; }

/* 相关文章 */
.learn-related { margin-top: 40px; }
.learn-related-title { font-size: 16px; font-weight: 600; color: #101828; margin-bottom: 16px; }
.learn-related-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.learn-related-list li a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: #fafafa;
    border: 1px solid #f0f0f0;
    border-radius: 8px;
    font-size: 14px;
    color: #344054;
    text-decoration: none;
    transition: border-color .15s, color .15s;
}
.learn-related-list li a:hover { border-color: #FF7744; color: #FF7744; text-decoration: none; }
.learn-related-list li a::before { content: "→"; color: #FF7744; flex-shrink: 0; }

/* 响应式 */
@media (max-width: 900px) {
    .learn-categories { grid-template-columns: repeat(2, 1fr); }
    .learn-article-page { flex-direction: column; gap: 24px; padding: 24px 16px 60px; }
    .learn-sidebar { width: 100%; position: static; }
    .learn-hero-title { font-size: 26px; }
}
@media (max-width: 500px) {
    .learn-categories { grid-template-columns: 1fr; }
    .learn-article-title { font-size: 22px; }
}