* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        /* BANNER 全屏 + IMG标签 + 左右顶格铺满 */
        
/* ========== PC 端 Banner ========== */
.lk-banner {
  width: 100%;
  height: 380px;
  overflow: hidden;
  position: relative;
  margin: 78px auto;
}
.lk-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

/* ========== 移动端：只显示图片左侧 ========== */
@media (max-width: 768px) {
  .lk-banner {
    height: 220px; /* 美观高度，不矮 */
  }
  .lk-banner img {
    object-position: left top !important; /* 强制显示图片左边 */
  }
}

        /* 主体 1600px 居中 */
        .lk-container {
            max-width: 1600px;
            width: 100%;
            margin: 0 auto;
            padding: 0 20px;
            font-family: "Microsoft YaHei", Arial, sans-serif;
            color: #333;
            line-height: 1.6;
        }

        /* 面包屑 */
        .lk-bread {
            padding: 18px 0;
            font-size: 14px;
            color: #666;
            border-bottom: 1px solid #eee;
            margin-bottom: 35px;
        }
        .lk-bread a {
            color: #666;
            text-decoration: none;
        }
        .lk-bread a:hover {
            color: #0066cc;
        }
        .lk-bread span {
            margin: 0 8px;
            color: #999;
        }

        /* 标题 */
        .lk-title {
            font-size: 28px;
            text-align: center;
            margin-bottom: 40px;
        }
        .lk-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background: #0066cc;
            margin: 15px auto 0;
        }

        /* 产品网格 */
        .lk-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            padding-bottom: 50px;
        }

        /* 卡片整块可点击 */
        .lk-item a {
            display: block;
            background: #f9f9f9;
            border: 1px solid #eee;
            border-radius: 8px;
            text-align: center;
            text-decoration: none;
            color: #333;
            transition: 0.3s;
            overflow: hidden;
        }
        .lk-item a:hover {
            transform: translateY(-8px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            border-color: #0066cc;
            color: #0066cc;
        }

        /* 产品图片：完整显示、不变形 */
        .lk-item-img {
            display: block;
            width: 100%;
            height: auto;
        }

        .lk-item-name {
            padding: 20px 15px;
            font-size: 18px;
            font-weight: 500;
        }

        /* 响应式 */
        @media (max-width: 1200px) {
            .lk-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .lk-grid { grid-template-columns: 1fr; }
        }