/* Nav 永遠白底固定，加黃線 */
        .nav {
            
            position: sticky;
            top: 0;
            left: 0;
            width: 100%;
            background-color: white;
            padding: 10px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 1000;
            border-bottom: 5px solid #ffc709; /* 黃線，5px */
            box-shadow: 0 5px 0 0 #4adbed;
            box-sizing: border-box;
            
        }

        /* Nav 左邊圖片容器（一直顯示） */
        .nav-logo {
            display: flex;
            flex-direction: row;
            justify-content: center;
            align-items: center;
            gap: 10px;
            
        }

        .nav-logo img {
            height: 30px; /* 調圖片大小 */
            width: auto;
        }

        /* Nav 右邊菜單文字 */
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 20px;
        }

        .nav-menu a {
            color: #4adbed; /* 正常藍字 */
            text-decoration: none;
            padding: 8px 12px;
            border-radius: 4px;
            transition: background-color 0.3s ease, color 0.3s ease;
            font-weight: bold;
        }

        .nav-menu a:hover {
            background-color: #4adbed; /* hover 藍底 */
            color: white; /* 白字 */
        }

        /* 手機響應式 */
        @media (max-width: 768px) {
            .nav-menu {
                gap: 10px;
            }
            .nav-logo img {
                height: 20px; /* 調圖片大小 */
                width: auto;
            }
        }