:root {
            --dark-blue: #0a0e4e;
            --deep-blue: #00022e;
            --red-accent: #d62839;
            --light-red: #ff4d5a;
            --gradient-blue: linear-gradient(135deg, var(--deep-blue) 0%, var(--dark-blue) 100%);
            --gradient-red: linear-gradient(135deg, #8a0a15 0%, var(--red-accent) 100%);
            --gradient-mix: linear-gradient(135deg, var(--deep-blue) 0%, var(--dark-blue) 50%, var(--red-accent) 100%);
            --text-light: #f8f9fa;
            --text-dark: #212529;
            --card-bg: rgba(255, 255, 255, 0.98);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            --base-font-size: clamp(14px, 2vw, 16px);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Poppins', 'Segoe UI', sans-serif;
        }

        html {
            font-size: var(--base-font-size);
            scroll-behavior: smooth;
        }

        body {
            background-color: #f9f9f9;
            color: var(--text-dark);
            line-height: 1.7;
            overflow-x: hidden;
            -webkit-text-size-adjust: 100%;
            -webkit-tap-highlight-color: transparent;
        }

        /* Floating Controls - Improved for mobile */
        .top-controls {
            position: fixed;
            top: 10px;
            right: 10px;
            z-index: 1000;
            display: flex;
            gap: 8px;
        }

        .home-btn, .lang-toggle {
            background: rgba(255, 255, 255, 0.95);
            border: none;
            border-radius: 50px;
            padding: 0.8rem 1.2rem;
            cursor: pointer;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 500;
            font-size: 0.9rem;
            min-height: 44px; /* Minimum touch target size */
        }

        .home-btn:hover, .lang-toggle:hover {
            background: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }

        .lang-menu {
            position: absolute;
            top: 100%;
            right: 0;
            background: white;
            border-radius: 8px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
            overflow: hidden;
            max-height: 0;
            transition: max-height 0.3s ease-out;
            width: 160px;
        }

        .lang-menu.open {
            max-height: 200px;
        }

        .lang-option {
            padding: 0.8rem 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: background 0.2s;
            min-height: 44px; /* Minimum touch target size */
        }

        .lang-option:hover {
            background: #f5f5f5;
        }

        .lang-flag {
            width: 20px;
            height: 15px;
            object-fit: cover;
            border-radius: 2px;
        }

        /* Banner - Improved aspect ratio */
        .hero-banner {
            width: 100%;
            height: 65vh;
            min-height: 450px;
            background: url('https://ptqiaoxingindustry.id/wp-mg-conten/content-fictur/web-banner-thermocouple.webp') center/cover no-repeat;
            position: relative;
            display: flex;
            align-items: flex-end;
        }

        /* About Section - More fluid */
        .about-section {
            background: var(--card-bg);
            border-radius: 12px;
            padding: clamp(1.5rem, 5vw, 3rem);
            margin: -50px auto 0;
            width: 90%;
            max-width: min(1000px, 95vw);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            position: relative;
            z-index: 2;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        .about-section h2 {
            color: var(--dark-blue);
            font-size: clamp(1.5rem, 5vw, 2.2rem);
            margin-bottom: 1.2rem;
            position: relative;
            padding-bottom: 0.8rem;
            background: var(--gradient-mix);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.3;
        }

        .about-section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 70px;
            height: 4px;
            background: var(--gradient-red);
            border-radius: 2px;
        }

        .about-section p {
            margin-bottom: 1.2rem;
            font-size: clamp(1rem, 3vw, 1.1rem);
            color: #444;
        }

        .features-list {
            list-style: none;
            margin: 1.5rem 0;
            padding-left: 0;
        }

        .features-list li {
            margin-bottom: 0.8rem;
            padding-left: 2rem;
            position: relative;
            color: #555;
            font-size: clamp(0.95rem, 3vw, 1rem);
        }

        .features-list li i {
            color: var(--red-accent);
            position: absolute;
            left: 0;
            top: 0.2rem;
            font-size: 1.2rem;
        }

        /* Main Container - More fluid */
        .main-container {
            max-width: 1200px;
            margin: 3rem auto;
            padding: 0 clamp(1rem, 4vw, 2rem);
            width: 100%;
        }

        /* Product Section - Improved stacking */
        .product-section {
            display: flex;
            flex-wrap: wrap;
            gap: clamp(1.5rem, 4vw, 3rem);
            margin: 3rem 0;
        }

        .product-info {
            flex: 1 1 100%;
            min-width: 0; /* Fix flexbox overflow */
            background: var(--card-bg);
            border-radius: 12px;
            padding: clamp(1.5rem, 4vw, 2.5rem);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        @media (min-width: 768px) {
            .product-info {
                flex: 1 1 calc(50% - 1.5rem);
            }
        }

        .product-info:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }

        .product-info h2 {
            color: var(--dark-blue);
            margin-bottom: 1.5rem;
            font-size: clamp(1.4rem, 4vw, 1.9rem);
            position: relative;
            padding-bottom: 0.8rem;
            line-height: 1.3;
        }

        .product-info h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 4px;
            background: var(--gradient-red);
            border-radius: 2px;
        }

        .product-info ul {
            list-style: none;
            margin-top: 1.5rem;
        }

        .product-info ul li {
            margin-bottom: 1rem;
            padding-left: 2rem;
            position: relative;
            color: #555;
            font-size: clamp(0.95rem, 3vw, 1rem);
        }

        .product-info ul li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            color: var(--red-accent);
            font-size: 1.1rem;
        }

        /* Enhanced Gallery Section - Improved thumbnails */
        .product-gallery {
            flex: 1 1 100%;
            min-width: 0;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        @media (min-width: 768px) {
            .product-gallery {
                flex: 1 1 calc(50% - 1.5rem);
            }
        }

        .main-image-container {
            width: 100%;
            height: clamp(250px, 40vw, 400px);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            cursor: pointer;
            position: relative;
            border: 1px solid rgba(0, 0, 0, 0.08);
        }

        .main-image-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .main-image-container:hover img {
            transform: scale(1.03);
        }

        .thumbnail-scroller {
            display: flex;
            gap: 0.8rem;
            padding: 0.8rem 0.5rem;
            overflow-x: auto;
            scrollbar-width: thin;
            scrollbar-color: var(--red-accent) #f1f1f1;
            -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
        }

        .thumbnail-scroller::-webkit-scrollbar {
            height: 6px;
        }

        .thumbnail-scroller::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }

        .thumbnail-scroller::-webkit-scrollbar-thumb {
            background: var(--gradient-red);
            border-radius: 10px;
        }

        .thumbnail-item {
            flex: 0 0 auto;
            width: clamp(70px, 15vw, 90px);
            height: clamp(70px, 15vw, 90px);
            min-width: 70px; /* Prevent shrinking */
            min-height: 70px;
            border-radius: 8px;
            overflow: hidden;
            cursor: pointer;
            border: 2px solid transparent;
            transition: var(--transition);
            position: relative;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
        }

        .thumbnail-item.active {
            border-color: var(--red-accent);
            transform: scale(1.08);
            box-shadow: 0 5px 15px rgba(214, 40, 57, 0.3);
        }

        .thumbnail-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .thumbnail-item:hover {
            border-color: var(--dark-blue);
        }

        /* Buttons - Better touch targets */
        .buttons {
            display: flex;
            gap: 1rem;
            margin-top: 2rem;
            flex-wrap: wrap;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--gradient-red);
            color: white;
            padding: 0.9rem 1.8rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            font-size: 1rem;
            box-shadow: 0 4px 15px rgba(214, 40, 57, 0.3);
            min-height: 50px; /* Better touch target */
            flex: 1 1 auto;
            min-width: 150px; /* Prevent buttons from becoming too narrow */
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(214, 40, 57, 0.4);
        }

        .cta-button.secondary {
            background: var(--gradient-blue);
            box-shadow: 0 4px 15px rgba(10, 14, 78, 0.3);
        }

        .cta-button.secondary:hover {
            box-shadow: 0 8px 20px rgba(10, 14, 78, 0.4);
        }

        .cta-button i {
            margin-right: 0.7rem;
            font-size: 1.1rem;
        }

        /* Features Section - Better spacing */
        .features-section {
            background: var(--gradient-mix);
            color: var(--text-light);
            padding: clamp(3rem, 6vw, 5rem) clamp(1rem, 4vw, 2rem);
            margin: 4rem 0 3rem;
            position: relative;
            overflow: hidden;
        }

        .features-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1518770660439-4636190af475?ixlib=rb-4.0.3&auto=format&fit=crop&w=1470&q=80') center/cover no-repeat;
            opacity: 0.08;
        }

        .features-content {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .features-content h2 {
            font-size: clamp(1.8rem, 5vw, 2.4rem);
            margin-bottom: clamp(2rem, 5vw, 3rem);
            text-align: center;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
            line-height: 1.3;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
            gap: clamp(1.5rem, 3vw, 2.5rem);
        }

        .feature-card {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(10px);
            border-radius: 12px;
            padding: clamp(1.5rem, 4vw, 2.5rem);
            transition: var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .feature-card:hover {
            transform: translateY(-8px);
            background: rgba(255, 255, 255, 0.18);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
        }

        .feature-card h3 {
            font-size: clamp(1.2rem, 3vw, 1.4rem);
            margin-bottom: 1.2rem;
            color: white;
            display: flex;
            align-items: center;
            line-height: 1.4;
        }

        .feature-card h3 i {
            margin-right: 1rem;
            color: var(--light-red);
            font-size: clamp(1.4rem, 3vw, 1.6rem);
        }

        .feature-card p {
            opacity: 0.9;
            font-size: clamp(0.95rem, 3vw, 1.05rem);
        }

        /* Modal - Better mobile experience */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.95);
            overflow: auto;
            touch-action: manipulation;
        }

        .modal-content {
            margin: auto;
            display: block;
            max-width: 95%;
            max-height: 95%;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: zoom 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
            border-radius: 8px;
            box-shadow: 0 0 40px rgba(214, 40, 57, 0.3);
            -webkit-user-select: none;
            user-select: none;
        }

        @keyframes zoom {
            from {transform: translate(-50%, -50%) scale(0.9); opacity: 0;}
            to {transform: translate(-50%, -50%) scale(1); opacity: 1;}
        }

        .close {
            position: absolute;
            top: 20px;
            right: 20px;
            color: white;
            font-size: 2rem;
            font-weight: bold;
            cursor: pointer;
            transition: var(--transition);
            text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .close:hover {
            color: var(--light-red);
            transform: rotate(90deg);
        }

        /* Improved mobile navigation */
        @media (max-width: 767px) {
            .top-controls {
                top: 5px;
                right: 5px;
            }
            
            .home-btn, .lang-toggle {
                padding: 0.6rem 1rem;
                font-size: 0.8rem;
            }
            
            .lang-menu {
                width: 140px;
            }
            
            .hero-banner {
              display: none !important;
            }
            
            .buttons {
                flex-direction: column;
            }
            
            .cta-button {
                width: 100%;
            }
            
            .thumbnail-scroller {
                padding-bottom: 1rem; /* More space for scroll */
            }
        }

        /* Very small screens */
        @media (max-width: 480px) {
            .about-section {
                width: 95%;
                margin-top: -30px;
            }
            
            .feature-card {
                padding: 1.5rem;
            }
            
            .close {
                top: 10px;
                right: 10px;
                font-size: 1.8rem;
            }
        }

        /* Animations */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .animated {
            opacity: 0;
            animation: fadeInUp 0.8s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
        }

        .delay-1 { animation-delay: 0.2s; }
        .delay-2 { animation-delay: 0.4s; }
        .delay-3 { animation-delay: 0.6s; }