/* ============ AI 全能导航（knowledge）========= */
.kb-section { background: var(--color-bg, #F5F3F0); padding: 32px 0 80px; min-height: 60vh; }
.kb-toolbar { display: flex; gap: 12px; align-items: center; margin-bottom: 20px; max-width: 1200px; margin-left: auto; margin-right: auto; padding: 0 20px; }
.kb-toolbar input { flex: 1; padding: 10px 14px; border: 1px solid var(--color-border, #E8E7E3); border-radius: 10px; background: var(--color-surface, #FFFFFF); font: inherit; color: var(--color-text, #2C2A28); }
.kb-toolbar input:focus { outline: none; border-color: var(--color-primary, #3A5A8F); }
.kb-count { font-size: 13px; color: var(--color-text-muted, #8A857C); white-space: nowrap; }

.kb-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 20px; max-width: 1200px; margin: 0 auto; padding: 0 20px; align-items: start; }

.kb-sidebar { position: sticky; top: 96px; background: var(--color-surface, #FFFFFF); border: 1px solid var(--color-border, #E8E7E3); border-radius: 14px; padding: 14px 12px; }
.kb-sidebar-title { margin: 0 0 10px; font-size: 14px; color: var(--color-text-muted, #8A857C); }
.kb-sidebar-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.kb-sidebar-btn { display: flex; align-items: center; gap: 8px; width: 100%; padding: 8px 10px; border: 0; background: transparent; border-radius: 8px; font: inherit; font-size: 14px; color: var(--color-text-secondary, #57534C); cursor: pointer; text-align: left; transition: background .15s ease, color .15s ease; }
.kb-sidebar-btn:hover { background: var(--color-bg-muted, #ECE9E4); }
.kb-sidebar-item.is-active .kb-sidebar-btn { background: var(--color-primary-subtle, #E8EEF4); color: var(--color-primary, #3A5A8F); font-weight: 600; }
.kb-sidebar-icon { font-size: 14px; }
.kb-sidebar-count { margin-left: auto; font-size: 12px; color: var(--color-text-muted, #8A857C); }

.kb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.kb-card { position: relative; background: var(--color-surface, #FFFFFF); border: 1px solid var(--color-border, #E8E7E3); border-radius: 12px; transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
.kb-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.06); border-color: var(--color-primary-glow, #B3C3DA); }
.kb-card-link { display: block; padding: 16px; color: inherit; text-decoration: none; }
.kb-card-head { display: flex; gap: 12px; margin-bottom: 10px; }
.kb-card-icon { width: 36px; height: 36px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: var(--color-bg-muted, #ECE9E4); border-radius: 8px; overflow: hidden; }
.kb-card-icon img { width: 100%; height: 100%; object-fit: contain; }
.kb-letter-icon { display: inline-flex; align-items: center; justify-content: center; background: var(--color-primary-subtle, #E8EEF4); color: var(--color-primary, #3A5A8F); border-radius: 8px; font-weight: 700; }
.kb-card-meta { min-width: 0; flex: 1; }
.kb-card-title { margin: 0 0 6px; font-size: 15px; font-weight: 600; color: var(--color-text, #2C2A28); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kb-card-chips { display: flex; gap: 4px; flex-wrap: wrap; }
.kb-kind { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; }
.kb-kind-tool { background: #E8EEF4; color: #3A5A8F; }
.kb-kind-mine { background: #E8F5EC; color: #2C6A45; }
.kb-pricing { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px; }
.kb-pricing-free { background: #E8F5EC; color: #2C6A45; }
.kb-pricing-freemium { background: #FFF6E5; color: #8A6A0E; }
.kb-pricing-paid { background: #FCE9E6; color: #842C20; }
.kb-card-desc { margin: 0 0 10px; color: var(--color-text-secondary, #57534C); font-size: 13px; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.kb-card-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.kb-tag { display: inline-block; padding: 1px 8px; border-radius: 999px; background: var(--color-bg-muted, #ECE9E4); color: var(--color-text-secondary, #57534C); font-size: 11px; }
.kb-card-visit { position: absolute; top: 14px; right: 14px; padding: 2px 8px; font-size: 11px; color: var(--color-text-muted, #8A857C); text-decoration: none; border-radius: 4px; opacity: 0; transition: opacity .15s ease, color .15s ease; }
.kb-card:hover .kb-card-visit { opacity: 1; }
.kb-card-visit:hover { color: var(--color-primary, #3A5A8F); }

.kb-empty { text-align: center; color: var(--color-text-muted, #8A857C); padding: 60px 0; }

/* 详情页 */
.kb-breadcrumb { font-size: 13px; color: var(--color-text-muted, #8A857C); margin-bottom: 12px; }
.kb-breadcrumb a { color: var(--color-primary, #3A5A8F); text-decoration: none; }
.kb-detail-head { display: flex; gap: 18px; align-items: center; }
.kb-detail-icon { width: 56px; height: 56px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: var(--color-bg-muted, #ECE9E4); border-radius: 12px; overflow: hidden; }
.kb-detail-icon img { width: 100%; height: 100%; object-fit: contain; }
.kb-detail-name-en { margin: 4px 0 6px; color: var(--color-text-muted, #8A857C); font-size: 14px; }
.kb-detail-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.kb-detail-body { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 24px; }
.kb-detail-main h2 { margin: 20px 0 8px; font-size: 18px; }
.kb-detail-main h2:first-child { margin-top: 0; }
.kb-detail-side { display: flex; flex-direction: column; gap: 12px; }
.kb-detail-actions { display: flex; flex-direction: column; gap: 8px; }
.kb-meta-card { padding: 14px; background: var(--color-bg-subtle, #F5F3F0); border: 1px solid var(--color-border, #E8E7E3); border-radius: 12px; display: flex; flex-direction: column; gap: 8px; }
.kb-meta-row { display: flex; gap: 8px; font-size: 13px; }
.kb-meta-key { color: var(--color-text-muted, #8A857C); min-width: 48px; }
.kb-meta-val { color: var(--color-text, #2C2A28); }
.kb-related { margin-top: 40px; }
.kb-related h2 { font-size: 18px; margin-bottom: 14px; }

@media (max-width: 900px) {
  .kb-layout { grid-template-columns: 1fr; }
  .kb-sidebar { position: static; }
  .kb-detail-body { grid-template-columns: 1fr; }
}
/* Hero 三联数据 */
.kb-hero { text-align: center; }
.kb-stats { display: flex; gap: 24px; justify-content: center; margin: 22px 0; flex-wrap: wrap; }
.kb-stat { display: flex; flex-direction: column; align-items: center; min-width: 80px; }
.kb-stat-num { font-size: 32px; font-weight: 700; color: var(--color-primary, #3A5A8F); font-variant-numeric: tabular-nums; }
.kb-stat-label { font-size: 13px; color: var(--color-text-muted, #8A857C); margin-top: 2px; }

/* 大类段（取代原单页混排） */
.kb-cat-section { margin-bottom: 40px; }
.kb-cat-section:last-child { margin-bottom: 0; }
.kb-cat-head { margin-bottom: 16px; padding: 0 20px; max-width: 1200px; margin-left: auto; margin-right: auto; }
.kb-cat-title { display: flex; align-items: center; gap: 8px; margin: 0 0 6px; font-size: 20px; font-weight: 700; color: var(--color-text, #2C2A28); }
.kb-cat-icon { font-size: 22px; }
.kb-cat-count { font-size: 13px; font-weight: 500; color: var(--color-text-muted, #8A857C); padding: 2px 8px; background: var(--color-bg-muted, #ECE9E4); border-radius: 999px; margin-left: 4px; }
.kb-cat-desc { margin: 0 0 10px; color: var(--color-text-muted, #8A857C); font-size: 13px; }
.kb-sub-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.kb-sub-chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 999px; background: var(--color-bg, #FFFFFF); border: 1px solid var(--color-border, #E8E7E3); color: var(--color-text-secondary, #57534C); font-size: 12px; text-decoration: none; transition: border-color .15s ease, color .15s ease, background .15s ease; }
.kb-sub-chip:hover { border-color: var(--color-primary, #3A5A8F); color: var(--color-primary, #3A5A8F); }
.kb-sub-count { padding: 1px 6px; background: var(--color-bg-muted, #ECE9E4); border-radius: 999px; font-size: 11px; }
.kb-sub-chip:hover .kb-sub-count { background: var(--color-primary-subtle, #E8EEF4); }

/* 旧版 sidebar 保持兼容 */
.kb-content > .kb-cat-section .kb-grid { max-width: 1200px; margin: 0 auto; }