/* ============================================
   产品知识系列页面样式
   ============================================ */

/* 面包屑导航 */
.breadcrumb {
  font-size: 0.85rem;
  color: #888;
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { color: #bbb; }

/* 知识详情页主区域 */
.knowledge-section { padding: 48px 0; }

/* 封面大图 */
.knowledge-cover {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 40px;
  max-height: 400px;
}
.knowledge-cover img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  display: block;
}
.cover-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 60px 32px 28px;
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
  color: #fff;
}
.cover-badge {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
}
.cover-overlay h2 {
  font-size: 1.6rem;
  color: #fff;
  margin: 0 0 6px;
}
.cover-sub { font-size: 0.95rem; color: rgba(255,255,255,0.88); margin: 0; }

/* 正文区域 */
.knowledge-body {
  max-width: 780px;
  margin: 0 auto 40px;
  line-height: 1.85;
  font-size: 1.02rem;
  color: #333;
}
.knowledge-body p { margin: 0 0 28px; }
.tag-row {
  background: var(--bg-alt);
  border-left: 4px solid var(--primary);
  padding: 10px 16px;
  border-radius: 0 6px 6px 0;
  margin: 20px 0;
  font-size: 0.95rem;
  color: var(--primary-dark);
  font-weight: 600;
}

/* 上一篇/下一篇导航 */
.knowledge-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  border-top: 1px solid #eee;
  border-bottom: 1px solid #eee;
  max-width: 780px;
  margin: 0 auto;
}
.knowledge-nav a {
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 0.9rem;
  text-decoration: none;
  color: #fff;
  background: var(--primary);
  transition: background 0.2s;
}
.knowledge-nav a:hover { background: var(--primary-dark); }
.knowledge-nav .nav-list {
  background: #f0f0f0;
  color: var(--primary-dark);
}
.knowledge-nav .nav-list:hover { background: #e0e0e0; }

/* 目录页列表 */
.knowledge-list { max-width: 860px; margin: 0 auto; }
.knowledge-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  margin-bottom: 14px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.knowledge-item:hover {
  box-shadow: 0 4px 18px rgba(0,0,0,0.1);
  transform: translateY(-2px);
}
.ki-badge {
  flex-shrink: 0;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  text-align: center;
  line-height: 1.2;
}
.ki-body { flex: 1; min-width: 0; }
.ki-body h3 { font-size: 1.05rem; color: var(--primary-dark); margin: 0 0 4px; }
.ki-body p { font-size: 0.88rem; color: #666; margin: 0; }
.ki-read {
  flex-shrink: 0;
  padding: 7px 16px;
  border-radius: 20px;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  text-decoration: none;
  transition: background 0.2s;
}
.ki-read:hover { background: var(--accent-dark, #b5651d); }

/* 目录页章节头部 */
.knowledge-section-header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--primary);
}


/* ===== 知识系列横幅（news.html 入口） ===== */
.knowledge-banner {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 36px;
  max-height: 260px;
}
.knowledge-banner img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
}
.kb-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(24,80,50,0.88) 0%, rgba(12,50,30,0.72) 100%);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 28px 40px;
  color: #fff;
}
.kb-tag {
  display: inline-block;
  background: rgba(255,255,255,0.25);
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 20px;
  padding: 2px 12px;
  font-size: 0.78rem;
  margin-bottom: 10px;
}
.kb-overlay h2 { margin: 0 0 8px; font-size: 1.5rem; color: #fff; }
.kb-overlay p { margin: 0 0 16px; font-size: 0.95rem; opacity: 0.9; }
.kb-btn {
  display: inline-block;
  background: #fff;
  color: var(--primary-dark);
  padding: 9px 24px;
  border-radius: 22px;
  font-weight: 700;
  text-decoration: none;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.kb-btn:hover { background: var(--bg-alt); }