/* 基础重置 */
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Helvetica Neue', Arial, sans-serif; }
body { background-color: #f4f6f8; padding: 20px 0; color: #333; }
.container { max-width: 1200px; margin: 0 auto; background-color: #ffffff; box-shadow: 0 4px 10px rgba(0,0,0,0.05); border-radius: 8px; overflow: hidden; }

/* 顶部导航栏 */
header { display: flex; justify-content: space-between; align-items: center; padding: 20px 40px; border-bottom: 1px solid #eee; background: #fff;}
.logo { color: #d32f2f; font-size: 24px; font-weight: bold; }
nav { display: flex; gap: 30px; }
nav a { text-decoration: none; color: #333; font-weight: 500; font-size: 15px; transition: color 0.3s; }
nav a:hover, nav a.active { color: #d32f2f; }

/* 1. 主视觉图 (修改为 16:9 比例) */
.hero-banner { 
    width: 100%; 
    aspect-ratio: 16 / 9; /* 这里控制了 16:9 比例 */
    background-color: #e0e0e0; 
    overflow: hidden; 
}
.hero-banner img { width: 100%; height: 100%; object-fit: cover; }

/* 商店主区域布局 (左右分栏) */
.shop-layout { display: flex; padding: 30px 40px; gap: 30px; }

/* 左侧边栏 - 分类过滤 */
.sidebar { width: 220px; flex-shrink: 0; }
.sidebar-box { border: 1px solid #eee; background: #fff; padding: 15px 0; border-radius: 4px; }
.sidebar-title { font-size: 16px; font-weight: bold; padding: 0 20px 15px 20px; border-bottom: 1px solid #eee; margin-bottom: 10px; }
.category-list { list-style: none; }
.category-list li { padding: 10px 20px; cursor: pointer; color: #555; transition: all 0.2s; font-size: 14px; }
.category-list li:hover { color: #0088cc; }
.category-list li.active { background-color: #e6f7ff; color: #0077b3; border-left: 3px solid #0077b3; font-weight: bold; }

/* 右侧产品展示区 */
.main-content { flex-grow: 1; }

/* 搜索框 */
.search-bar { display: flex; margin-bottom: 20px; border: 1px solid #ccc; border-radius: 4px; overflow: hidden; }
.search-bar input { flex-grow: 1; padding: 12px 15px; border: none; outline: none; font-size: 14px; }
.search-bar button { padding: 0 25px; background-color: #fca311; border: none; font-weight: bold; cursor: pointer; transition: background 0.3s; color: #fff;}
.search-bar button:hover { background-color: #e59400; }

/* 产品网格 */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }

/* 单个产品卡片 */
.product-card { border: 1px solid #eee; background: #fff; border-radius: 6px; padding: 15px; text-align: center; transition: box-shadow 0.3s; display: flex; flex-direction: column; }
.product-card:hover { box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
.product-img { width: 100%; height: 180px; object-fit: contain; margin-bottom: 15px; }
.product-tag { background-color: #f0f0f0; color: #888; font-size: 12px; padding: 3px 8px; border-radius: 3px; display: inline-block; margin-bottom: 8px; align-self: flex-start; }
.product-title { font-size: 16px; font-weight: bold; color: #0088cc; margin-bottom: 10px; text-align: left; line-height: 1.3; }
.product-desc { font-size: 12px; color: #666; text-align: left; margin-bottom: 15px; flex-grow: 1; }

/* 无结果提示 */
.no-results { grid-column: 1 / -1; text-align: center; padding: 50px; color: #888; }

/* 手机端适配 */
@media (max-width: 768px) { 
    .shop-layout { flex-direction: column; padding: 20px; } 
    .sidebar { width: 100%; } 
}