/* --- 全局樣式 (設計與前一個頁面完全相同，僅更換主色調) --- */
        :root {
            --primary-color: #27ae60; /* 品牌主色調 - 健康綠色 */
            --dark-color: #333;
            --light-color: #fff;
            --grey-bg: #f7f9fa;
            --text-color: #555;
			--header-height-desktop: 80px; /* 【新增】定義桌面版 header 高度 */
            --header-height-mobile: 140px;
        }
        html {
            scroll-behavior: smooth; /* 讓頁面內跳轉更平滑 */
            scroll-padding-top: var(--header-height-desktop); /* 【新增】修正錨點跳轉位置 */
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            margin: 0;
            padding: 0;
            color: var(--text-color);
            line-height: 1.6;
            background-color: var(--light-color);
			padding-top: var(--header-height-desktop);
        }

        .container {
            max-width: 960px;
            margin: 0 auto;
            padding: 0 20px;
        }

        section {
            padding: 60px 0;
        }

        h1, h2, h3 {
            color: var(--dark-color);
            text-align: center;
        }

        h1 {
            font-size: 2.8em;
            margin-bottom: 10px;
        }

        h2 {
            font-size: 2.2em;
            margin-bottom: 40px;
        }
        
        h3 {
            font-size: 1.5em;
        }

        p {
            font-size: 1.1em;
            text-align: center;
        }

        img {
            max-width: 100%;
            height: auto;
        }

        /* --- 按鈕樣式 --- */
        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: var(--light-color);
            padding: 15px 35px;
            font-size: 1.2em;
            font-weight: bold;
            text-decoration: none;
            border-radius: 50px;
            transition: background-color 0.3s ease, transform 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .cta-button:hover {
            background-color: #229954;
            transform: translateY(-2px);
        }

        /* --- Header / Nav --- */
        .header {
			 padding: 15px 0;
            /* 【以下為主要修改】 */
            position: fixed; /* 設定為固定位置 */
            top: 0;
            left: 0;
            width: 100%;
            background-color: var(--light-color); /* 確保有背景色 */
            z-index: 1000; /* 確保在最上層 */
            box-shadow: 0 2px 10px rgba(0,0,0,0.1); /* 增加立體感陰影 */
			font-size: 1em;
        }
        .header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .headerindex {
            padding: 10px 0;
            border-bottom: 1px solid #eee;
			 position: fixed;
			top: 0;
            left: 0;
            width: 100%;
            background-color: var(--light-color); /* 確保有背景色 */
            z-index: 1000; /* 確保在最上層 */
            box-shadow: 0 2px 10px rgba(0,0,0,0.1); /* 增加立體感陰影 */
			font-size: 1em;
        }
        .headerindex .containerindex {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-weight: bold;
            font-size: 1.5em;
            color: var(--dark-color);
        }

        /* --- 英雄區 --- */
        .hero {
            text-align: center;
            padding: 80px 0;
        }
        .hero h1 {
            line-height: 1.2;
        }
        .hero .subtitle {
            font-size: 1.3em;
            max-width: 700px;
            margin: 20px auto 30px auto;
        }
        .hero-image {
            max-width: 300px;
            margin-bottom: 30px;
        }
        
        /* --- 功效區 --- */
        .benefits {
            background-color: var(--grey-bg);
        }
        .benefits-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            text-align: left;
        }
        .benefit-card {
            background-color: var(--light-color);
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        }
        .benefit-card h3 {
            text-align: left;
            margin-top: 0;
        }
        .benefit-card p {
            text-align: left;
            font-size: 1em;
        }
        
        /* --- 臨床實證區 --- */
        .proof {
            text-align: center;
        }
        .proof-content {
            display: flex;
            align-items: center;
            flex-wrap: wrap-reverse;
            gap: 40px;
            text-align: left;
        }
        .proof-text, .proof-image {
            flex: 1;
            min-width: 300px;
        }
        .proof-text h3 {
            text-align: left;
        }
        .proof-text p {
            text-align: left;
        }
        .proof-image img {
            border-radius: 10px;
        }
        .proof-stats {
            list-style: none;
            padding: 0;
            margin-top: 20px;
        }
        .proof-stats li {
            font-size: 1.1em;
            margin-bottom: 10px;
            position: relative;
            padding-left: 25px;
        }
        .proof-stats li::before {
            content: '✓';
            color: var(--primary-color);
            font-weight: bold;
            position: absolute;
            left: 0;
        }

        /* --- 科學原理區 --- */
        .science {
             background-color: var(--grey-bg);
        }
        
        /* --- FAQ 區 --- */
        .faq details {
            background: #fff;
            border: 1px solid #eee;
            border-radius: 8px;
            margin-bottom: 10px;
            padding: 15px 20px;
        }
        .faq summary {
            font-weight: bold;
            font-size: 1.2em;
            cursor: pointer;
            list-style: none;
        }
        .faq summary::-webkit-details-marker { display: none; }
        .faq summary::after {
            content: '+';
            float: right;
            font-size: 1.5em;
            line-height: 1;
        }
        .faq details[open] summary::after {
            content: '−';
        }
        .faq details p {
            text-align: left;
            padding-top: 10px;
            margin: 0;
        }

        /* --- 購買區 --- */
        .purchase {
            background-color: var(--dark-color);
            color: var(--light-color);
            text-align: center;
        }
        .purchase h2, .purchase h3 {
            color: var(--light-color);
        }
        .price {
            font-size: 2.5em;
            font-weight: bold;
            color: var(--primary-color);
            margin: 20px 0;
        }
        .trust-badges {
            margin-top: 30px;
            display: flex;
            justify-content: center;
            gap: 20px;
            font-size: 0.9em;
        }
        .testimonial-images {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
        }
        .testimonial-images div {
            flex-basis: 300px;
            text-align: center;
        }
        .testimonial-images img {
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        .testimonial-images p {
            margin-top: 10px;
            font-weight: bold;
        }
        /* --- Footer --- */
        .footer {
            text-align: center;
            padding: 20px 0;
            background-color: #f1f1f1;
            font-size: 0.9em;
            color: #777;
        }
        .science {
             background-color: var(--grey-bg);
        }
        .science-content {
            display: flex;
            gap: 40px;
            align-items: center;
            flex-wrap: wrap;
        }
        .science-text, .science-image {
            flex: 1;
            min-width: 300px;
        }
        .science-text p, .science-text ul {
            text-align: left;
        }
        .science-text li {
            margin-bottom: 10px;
        }
        .science-image img {
            border-radius: 10px;
        }
        /* --- 響應式設計 --- */
        @media (max-width: 768px) {
            h1 { font-size: 2.2em; }
            h2 { font-size: 1.8em; }
			.logo { font-size: 1.5em;}
        }
		@media (max-width: 480px) {
		  .logo {
			font-size: 0.9em;
		  }
			.cta-button {
				font-size: 1.1em;
				padding: 10px 25px;
			}
		}
.side-nav{
		  height:100%;
		  width:0;
		  position:fixed;
		  z-index:1;
		  top:140;
		  left:0;
		  background-color:#111;
		  opacity:0.9;
		  overflow-x:hidden;
		  padding-top:60px;
		  transition:0.5s;
		  overflow: scroll;
		}
		.dropdown{
		  height:90%;
		  width:0;
		  position:fixed;
		  z-index:1;
		  top:0;
		  left:0;
		  background-color:#FFF;
		  opacity:0.9;
		  overflow-x:hidden;
		  padding-top:60px;
		  transition:0.5s;
		  overflow: scroll;
		}

		.side-nav a{
		  padding:10px 10px 10px 30px;
		  text-decoration:none;
		  font-size:22px;
		  color:#ccc;
		  display:block;
		  transition:0.3s;
		}

		.side-nav a:hover{
		  color:#fff;
		}

		.side-nav .btn-close{
		  position:absolute;
		  top:0;
		  right:22px;
		  font-size:36px;
		  margin-left:50px;
		}
.side_expand {
	display:none;
	color:#888888;
	opacity:0.8;	
}
/* --- Product-specific Button Colors --- */
        .product-card .btn-metabolic { background-color: #27ae60; }
        .product-card .btn-metabolic:hover { background-color: #229954; }

        .product-card .btn-hella { background-color: #f39c12; }
        .product-card .btn-hella:hover { background-color: #e68a00; }

        .product-card .btn-immuno { background-color: #3498db; }
        .product-card .btn-immuno:hover { background-color: #2980b9; }
/* --- Products Section --- */
        .products {
            padding: 60px 0;
        }
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            text-align: center;
        }
        .product-card {
            background-color: var(--light-color);
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.07);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
        }
        .product-card-content {
             flex-grow: 1;
        }
        .product-card img {
            max-width: 150px;
            margin-bottom: 20px;
            border-radius: 8px;
        }
        .product-card p {
            text-align: center;
            font-size: 1em;
            margin-bottom: 25px;
        }
        .product-card .cta-button {
            width: 100%;
            font-size: 1.1em;
            padding: 12px 20px;
        }
/* --- Product Image Gallery --- */
.product-gallery {
    margin-bottom: 30px;
    max-width: 400px; /* Controls the max size of the gallery */
    margin-left: auto;
    margin-right: auto;
}

.main-image-container {
    margin-bottom: 15px;
    border: 1px solid #eee;
    border-radius: 10px;
    overflow: hidden; /* Ensures the image stays within the rounded corners */
    background-color: #fff;
}

.thumbnail-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap; /* Allows thumbnails to wrap on smaller screens */
}

.thumbnail {
    width: 65px;
    height: 65px;
    object-fit: cover; /* Ensures the image covers the area without distortion */

    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s ease, border-color 0.3s ease;
}

.thumbnail:hover {
    opacity: 1;
}

.thumbnail.active {
    border-color: var(--primary-color); /* Uses the existing primary color */
    opacity: 1;
}

/* --- Adjust original hero image style --- */
.hero-image {
    width: 100%; /* Make image responsive within its container */
    margin-bottom: 0; /* Remove original margin */
}
.buy_option{
	justify-content:center;
}