:root {
  --primary-color: #385675;
  --secondary-color: #7ca6be;
  --accent-color: #ff9900;
  --text-color: #444747;
  --light-bg: #ffffff;
  --dark-bg: #ffffff;
}

/* 基本響應式設置 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  background-color: var(--dark-bg);
  color: var(--text-color);
}

img, object, embed, video {
  max-width: 100%;
  height: auto;
}

/* 主要容器 */
.container {
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 15px;
}

/* 頂部導航 */
.header {
  background-color: var(--primary-color);
  color: white;
  padding: 15px 0;
}

.logo {
  display: block;
  max-width: 250px;
  margin: 0 auto;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding: 10px 0;
}

.nav a {
  color: white;
  text-decoration: none;
  padding: 10px 15px;
  margin: 5px;
  transition: all 0.3s ease;
}

.nav a:hover {
  color: var(--accent-color);
}

/* 內容區域 */
.content {
  display: flex;
  flex-wrap: wrap;
  background-color: white;
  padding: 15px 0;
}

.sidebar {
  width: 100%;
  padding: 15px;
  background-color: var(--light-bg);
}

.main-content {
  width: 100%;
  padding: 15px;
}

/* 產品列表 */
.product-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.product-item {
  width: 100%;
  margin-bottom: 20px;
  padding: 15px;
  background-color: var(--light-bg);
  border-radius: 5px;
}

/* 頁腳 */
.footer {
  background-color: var(--primary-color);
  color: white;
  padding: 15px 0;
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 10px;
}

.footer-nav a {
  color: white;
  text-decoration: none;
  padding: 5px 10px;
  margin: 5px;
}

/* 媒體查詢 - 平板 */
@media (min-width: 768px) {
  .sidebar {
    width: 30%;
  }
  
  .main-content {
    width: 70%;
  }
  
  .product-item {
    width: 48%;
  }
}

/* 媒體查詢 - 桌面 */
@media (min-width: 992px) {
  .product-item {
    width: 31%;
  }
}

/* 漢堡菜單 */
.menu-toggle {
  display: block;
  cursor: pointer;
  padding: 10px;
  text-align: center;
  background-color: var(--primary-color);
  color: white;
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
  
  .nav {
    display: flex !important;
  }
}

@media (max-width: 767px) {
  .nav {
    display: none;
  }
  
  .nav.active {
    display: flex;
    flex-direction: column;
  }
}