body {
            font-family: 'Roboto', 'Noto Sans TC', sans-serif;
            color: #333333;
            background-color: #fcfcfc;
            overflow-x: hidden; /* 防止左右進場動畫造成水平滾動條 */
        }
        
        /* Theme Colors */
        :root {
            --logo-color: #ed6c00; /* 橘色 */
            --primary-color: #0d47a1; /* 經典工業深藍 */
            --secondary-color: #f57c00; /* 活力橘色/緊固件亮點 */
            --dark-color: #212529;
            --light-bg: #f8f9fa;
        }
        
        .t1-1 {
            font-family: 'Roboto', 'Noto Sans TC';
            font-weight: 600;
        }

        .text-primary-theme {
            color: var(--primary-color);
        }
        
        .bg-primary-theme {
            background-color: var(--primary-color);
        }
        
        .bg-logo-theme {
            background-color: var(--logo-color);
        }

        /* Top bar info */
        .top-bar {
            background-color: var(--dark-color);
            color: #cccccc;
            font-size: 0.85rem;
            padding: 6px 0;
        }
        
        .top-bar a {
            color: #cccccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .top-bar a:hover {
            color: #ffffff;
        }

        /* Navbar Customization */
        .navbar {
            padding: 15px 0;
            box-shadow: 0 2px 15px rgba(0,0,0,0.06);
            background-color: rgba(255, 255, 255, 0.98) !important;
        }
        
        .navbar-brand img {
            max-height: 45px;
        }
        
        .navbar-brand span {
            font-weight: 800;
            letter-spacing: 1px;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        
        .logo-theme {
            color: #ed6c00;
            font-weight: 600;
        }
        .navbar-brand .sub {
            font-size: 0.8rem;
            display: block;
            color: #777;
            font-weight: 500;
            letter-spacing: 0px;
        }
        
        .nav-link {
            font-weight: 500;
            color: #444444 !important;
            padding: 8px 16px !important;
            transition: all 0.3s ease;
        }
        
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        
        /* Hero Carousel */
        .hero-carousel .carousel-item {
            height: 650px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        
        .hero-carousel .carousel-item::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(rgba(0,0,0,0.65), rgba(0,0,0,0.3));
        }
        
        .carousel-caption {
            top: 30%;
            bottom: auto;
            text-align: left;
            z-index: 2;
        }
        
        .carousel-caption h2 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        
        .carousel-caption p {
            font-size: 1.25rem;
            margin-bottom: 30px;
            max-width: 700px;
            font-weight: 300;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }

        .btn-theme {
            background-color: var(--primary-color);
            color: white;
            font-weight: 500;
            padding: 12px 30px;
            border-radius: 4px;
            transition: all 0.3s;
            border: none;
        }

        .btn-theme:hover {
            background-color: #0a3578;
            color: white;
            box-shadow: 0 4px 15px rgba(13, 71, 161, 0.4);
        }

        .btn-outline-theme {
            border: 2px solid #ffffff;
            color: white;
            font-weight: 500;
            padding: 10px 28px;
            border-radius: 4px;
            transition: all 0.3s;
            background: transparent;
        }

        .btn-outline-theme:hover {
            background-color: #ffffff;
            color: var(--primary-color);
        }
        
        /* Scroll Reveal Utility Classes (Initial state before JavaScript triggers) */
        .reveal-left {
            opacity: 0;
            transform: translateX(-50px);
            transition: all 1.2s cubic-bezier(0.25, 1, 0.5, 1);
        }

        .reveal-right {
            opacity: 0;
            transform: translateX(50px);
            transition: all 1.2s cubic-bezier(0.25, 1, 0.5, 1);
        }

        .reveal-active {
            opacity: 1;
            transform: translateX(0);
        }
        
        /* Feature Cards */
        .feature-card {
            background: #ffffff;
            border: none;
            border-radius: 8px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s, border-bottom 0.3s;
            overflow: hidden;
            border-bottom: 4px solid transparent;
        }
        
        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            border-bottom: 4px solid var(--primary-color);
        }
        
        .icon-box {
            width: 70px;
            height: 70px;
            background: rgba(13, 71, 161, 0.08);
            color: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            margin-bottom: 20px;
        }
        
        /* Product Categories */
        .section-title {
            position: relative;
            margin-bottom: 50px;
            font-weight: 800;
            color: var(--dark-color);
        }
        
        .section-title::after {
            content: "";
            width: 60px;
            height: 4px;
            background: var(--primary-color);
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
        }
        

        /* Quality Certification */
        .bg-certified {
            background: linear-gradient(rgba(13, 71, 161, 0.9), rgba(13, 71, 161, 0.95)), url('images/index-01.jpg');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            padding: 100px 0;
        }

        /* Test Process Section */
        .step-num {
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.25rem;
            margin: 0 auto 20px;
            transition: transform 0.3s ease;
        }

        .step-col:hover .step-num {
            transform: scale(1.2) rotate(360deg); /* 圓圈旋轉放大 */
        }

        /* Industry Applications Grid */
        .app-card {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .app-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.1) !important;
        }
        .app-card i {
            transition: transform 0.4s ease;
        }
        .app-card:hover i {
            transform: scale(1.2); /* 懸停時 icon 放大 */
        }

        /* Product Cards (圖片版) */
        .product-card {
            border: none;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            background: #fff;
            height: 100%;
        }

        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.12);
        }

        .product-img-wrapper1 {
            height: 220px;
            overflow: hidden;
            background-color: #f1f3f5;
            position: relative;
        }

        .product-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .product-card:hover .product-img {
            transform: scale(1.08); /* 懸停時圖片放大 */
        }

        /* Footer */
        footer {
            background-color: #1a1e21;
            color: #bdc4c9;
            font-size: 0.95rem;
        }

        footer h5 {
            color: white;
            font-weight: 700;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }

        footer h5::after {
            content: "";
            width: 30px;
            height: 2px;
            background: var(--primary-color);
            position: absolute;
            bottom: 0;
            left: 0;
        }

        footer a {
            color: #bdc4c9;
            text-decoration: none;
            transition: color 0.3s, padding-left 0.3s;
        }

        footer a:hover {
            color: white;
            padding-left: 5px;
        }

        .contact-info-list li {
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
        }

        .contact-info-list i {
            margin-right: 12px;
            color: var(--primary-color);
            font-size: 1.1rem;
            margin-top: 3px;
        }

        .copyright-bar {
            background-color: #111416;
            padding: 20px 0;
            font-size: 0.85rem;
        }

        /* Hero Banner 區塊 */
.about-hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.65)), url('../images/banner.jpg') center/cover no-repeat;
    color: #ffffff;
    padding: 90px 0;
}

/* 區塊標題下劃線裝飾 */
.shandi-section-title {
    position: relative;
    padding-bottom: 12px;
    margin-bottom: 30px;
    font-weight: 700;
}

.shandi-section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 3px;
    background-color: #d97706; /* 企業識別橘黃色調 */
}

/* 特色卡片 hover 懸浮效果 */
.shandi-card {
    border: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.shandi-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

/* 淺灰色背景區塊 */
.bg-shandi-light {
    background-color: #f8f9fa;
}

/* 產品卡片容器 */
.product-card {
    border: none;
    border-radius: 10px;
    overflow: hidden;
    background-color: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 圖片外框（溢出隱藏以達成縮放效果） */
.product-img-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4 / 3; /* 統一圖片比例 */
    background-color: #f1f3f5;
}

/* 產品圖片縮放動畫 */
.product-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

/* Hover 時卡片向上浮動與陰影加深 */
.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

/* Hover 時圖片放大 */
.product-card:hover .product-img-wrapper img {
    transform: scale(1.08);
}

/* 標題 hover 變色 */
.product-card:hover .product-title {
    color: #fff; /* 尚迪主題橘黃色 */
}

.product-title {
    transition: color 0.3s ease;
    font-size: 1.1rem;
    font-weight: 700;
}

.esg-img {
    margin-bottom: 50px;
    margin-top: 50px;
}

@media screen and (max-width: 768px) and (min-width: 479px) {
    .carousel-caption {
            top: 15%;
            bottom: auto;
            text-align: left;
            z-index: 2;
        }
}