:root {
            --primary: #0056b3;
            --primary-dark: #003d80;
            --primary-light: #e8f0fe;
            --accent: #f28c28;
            --accent-dark: #d4740e;
            --text-dark: #1a1a2e;
            --text-body: #444;
            --text-light: #666;
            --bg-white: #ffffff;
            --bg-light: #f8f9fc;
            --bg-dark: #0a1628;
            --border: #e2e8f0;
            --shadow: 0 4px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
            --radius: 12px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            color: var(--text-body);
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }

        .header.scrolled {
            box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        }

        .nav-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

        .logo-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            object-fit: contain;
        }

        .logo-text {
            display: flex;
            flex-direction: column;
        }

        .logo-text .cn {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.2;
        }

        .logo-text .en {
            font-size: 10px;
            color: var(--text-light);
            font-weight: 500;
            letter-spacing: 0.5px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            list-style: none;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-body);
            font-size: 14px;
            font-weight: 500;
            position: relative;
            padding: 4px 0;
            transition: var(--transition);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: var(--transition);
        }

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

        .nav-links a:hover::after {
            width: 100%;
        }

        .lang-switch {
            display: flex;
            align-items: center;
            background: var(--bg-light);
            border-radius: 20px;
            padding: 3px;
            gap: 2px;
        }

        .lang-btn {
            padding: 5px 14px;
            border: none;
            background: transparent;
            border-radius: 18px;
            cursor: pointer;
            font-size: 12px;
            font-weight: 600;
            color: var(--text-light);
            transition: var(--transition);
        }

        .lang-btn.active {
            background: var(--primary);
            color: white;
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
        }

        .mobile-toggle span {
            width: 24px;
            height: 2px;
            background: var(--text-dark);
            transition: var(--transition);
        }

        /* ===== Hero Section ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding-top: 72px;
            background: #001a3a;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
        }

        .hero-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0,26,58,0.88) 0%, rgba(0,51,102,0.82) 40%, rgba(0,86,179,0.75) 100%);
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 80%;
            height: 200%;
            background: radial-gradient(ellipse, rgba(242,140,40,0.12) 0%, transparent 60%);
            animation: heroGlow 8s ease-in-out infinite alternate;
            z-index: 1;
        }

        @keyframes heroGlow {
            0% { transform: translate(0, 0) scale(1); }
            100% { transform: translate(-5%, 5%) scale(1.1); }
        }

        .hero-pattern {
            position: absolute;
            inset: 0;
            background-image:
                radial-gradient(circle at 20% 80%, rgba(255,255,255,0.03) 1px, transparent 1px),
                radial-gradient(circle at 80% 20%, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 60px 60px;
            z-index: 1;
        }

        .hero-content {
            max-width: 1280px;
            margin: 0 auto;
            padding: 4rem 2rem;
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }

        .hero-left h1 {
            font-size: clamp(2.5rem, 5vw, 3.8rem);
            color: white;
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 1.5rem;
        }

        .hero-left h1 .accent {
            color: var(--accent);
        }

        .hero-left p {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.8);
            margin-bottom: 2.5rem;
            max-width: 500px;
            line-height: 1.8;
        }

        .hero-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .btn-primary {
            background: var(--accent);
            color: white;
            box-shadow: 0 4px 20px rgba(242,140,40,0.4);
        }

        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(242,140,40,0.5);
        }

        .btn-outline {
            background: transparent;
            color: white;
            border: 2px solid rgba(255,255,255,0.4);
        }

        .btn-outline:hover {
            background: white;
            color: var(--primary-dark);
            border-color: white;
        }

        .hero-right {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }

        .stat-card {
            background: rgba(255,255,255,0.08);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.12);
            border-radius: var(--radius);
            padding: 2rem 1.5rem;
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            background: rgba(255,255,255,0.12);
            transform: translateY(-4px);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1;
            margin-bottom: 8px;
        }

        .stat-label {
            font-size: 13px;
            color: rgba(255,255,255,0.7);
            font-weight: 500;
        }

        /* ===== Section Common ===== */
        .section {
            padding: 6rem 2rem;
        }

        .section-container {
            max-width: 1280px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-tag {
            display: inline-block;
            padding: 6px 18px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        .section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            color: var(--text-dark);
            font-weight: 800;
            margin-bottom: 1rem;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 650px;
            margin: 0 auto;
        }

        /* ===== About Section ===== */
        .about {
            background: var(--bg-light);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }

        .about-gallery {
            display: grid;
            grid-template-columns: 1fr 1fr;
            grid-template-rows: 1fr 1fr;
            gap: 12px;
            border-radius: var(--radius);
            overflow: hidden;
            aspect-ratio: 4/3;
        }

        .about-gallery-item {
            position: relative;
            overflow: hidden;
            border-radius: 8px;
        }

        .about-gallery-item:first-child {
            grid-row: 1 / 3;
        }

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

        .about-gallery-item:hover img {
            transform: scale(1.05);
        }

        .about-gallery-item .gallery-label {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 8px 12px;
            background: linear-gradient(transparent, rgba(0,0,0,0.6));
            color: white;
            font-size: 12px;
            font-weight: 600;
        }

        .about-text h3 {
            font-size: 1.8rem;
            color: var(--text-dark);
            font-weight: 700;
            margin-bottom: 1.5rem;
        }

        .about-text p {
            margin-bottom: 1.2rem;
            color: var(--text-body);
        }

        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-top: 2rem;
        }

        .about-feature {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 16px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }

        .about-feature-icon {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .about-feature span {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-dark);
        }

        /* ===== Products Section ===== */
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
        }

        .product-card {
            background: white;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border);
        }

        .product-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }

        .product-card-img {
            height: 220px;
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #f0f4f8, #dce4ed);
        }

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

        .product-card:hover .product-card-img img {
            transform: scale(1.08);
        }

        .product-card-body {
            padding: 1.5rem;
        }

        .product-card-body h4 {
            font-size: 1.1rem;
            color: var(--text-dark);
            font-weight: 700;
            margin-bottom: 0.5rem;
        }

        .product-card-body p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }

        .product-card-tag {
            display: inline-block;
            padding: 4px 10px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 4px;
            font-size: 11px;
            font-weight: 600;
            margin-top: 0.8rem;
        }

        /* ===== Product Structure Banner ===== */
        .product-structure-banner {
            margin-top: 3rem;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .product-structure-banner img {
            width: 100%;
            display: block;
        }

        /* ===== Workshop & Equipment Section ===== */
        .workshop {
            background: var(--bg-light);
        }

        .workshop-hero {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            margin-bottom: 2rem;
            aspect-ratio: 21/9;
        }

        .workshop-hero img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .workshop-hero-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 2rem 2.5rem;
            background: linear-gradient(transparent, rgba(0,0,0,0.7));
            color: white;
        }

        .workshop-hero-overlay h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 0.3rem;
        }

        .workshop-hero-overlay p {
            font-size: 14px;
            opacity: 0.85;
        }

        .workshop-gallery {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }

        .workshop-gallery-item {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            aspect-ratio: 4/3;
            box-shadow: var(--shadow);
        }

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

        .workshop-gallery-item:hover img {
            transform: scale(1.05);
        }

        .workshop-gallery-item .gallery-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 10px 16px;
            background: linear-gradient(transparent, rgba(0,0,0,0.65));
            color: white;
            font-size: 13px;
            font-weight: 600;
        }

        /* ===== Quality Control Section ===== */
        .qc-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }

        .qc-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            aspect-ratio: 4/3;
            box-shadow: var(--shadow);
            background: white;
        }

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

        .qc-card:hover img {
            transform: scale(1.05);
        }

        .qc-card-label {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 10px 16px;
            background: linear-gradient(transparent, rgba(0,10,30,0.75));
            color: white;
            font-size: 13px;
            font-weight: 600;
        }

        /* ===== Certifications Section ===== */
        .certifications {
            background: var(--bg-light);
        }

        .cert-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            max-width: 900px;
            margin: 0 auto;
        }

        .cert-item {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: white;
            transition: var(--transition);
        }

        .cert-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .cert-item img {
            width: 100%;
            display: block;
        }

        /* ===== Advantages Section ===== */
        .advantages {
            background: var(--bg-dark);
            color: white;
        }

        .advantages .section-title {
            color: white;
        }

        .advantages .section-desc {
            color: rgba(255,255,255,0.6);
        }

        .advantages .section-tag {
            background: rgba(242,140,40,0.15);
            color: var(--accent);
        }

        .adv-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }

        .adv-card {
            padding: 2.5rem 2rem;
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: var(--radius);
            transition: var(--transition);
        }

        .adv-card:hover {
            background: rgba(255,255,255,0.08);
            border-color: rgba(242,140,40,0.3);
            transform: translateY(-4px);
        }

        .adv-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
        }

        .adv-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: white;
        }

        .adv-card p {
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            line-height: 1.7;
        }

        /* ===== Process Section ===== */
        .process-section {
            background: var(--bg-light);
        }

        .process-banner {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            margin-bottom: 3rem;
        }

        .process-banner img {
            width: 100%;
            display: block;
        }

        .process-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
        }

        .process-step {
            text-align: center;
            padding: 2rem 1.5rem;
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            position: relative;
            transition: var(--transition);
        }

        .process-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .process-step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            margin: 0 auto 1rem;
        }

        .process-step h4 {
            font-size: 1rem;
            color: var(--text-dark);
            font-weight: 700;
            margin-bottom: 0.5rem;
        }

        .process-step p {
            font-size: 13px;
            color: var(--text-light);
        }

        /* ===== FAQ Section ===== */
        .faq {
            background: var(--bg-white);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: white;
            border-radius: var(--radius);
            margin-bottom: 1rem;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
            border: 1px solid var(--border);
        }

        .faq-question {
            padding: 1.5rem 2rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--text-dark);
            transition: var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-arrow {
            transition: var(--transition);
            flex-shrink: 0;
            margin-left: 1rem;
        }

        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-answer-inner {
            padding: 0 2rem 1.5rem;
            color: var(--text-body);
            font-size: 15px;
            line-height: 1.8;
        }

        .faq-item.active .faq-answer {
            max-height: 500px;
        }

        /* ===== Contact Section ===== */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }

        .contact-item {
            display: flex;
            gap: 1rem;
            align-items: flex-start;
        }

        .contact-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .contact-item h4 {
            font-size: 14px;
            color: var(--text-dark);
            font-weight: 700;
            margin-bottom: 4px;
        }

        .contact-item p {
            font-size: 14px;
            color: var(--text-light);
        }

        .contact-form {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        .contact-form h3 {
            font-size: 1.4rem;
            color: var(--text-dark);
            font-weight: 700;
            margin-bottom: 1.5rem;
        }

        .form-group {
            margin-bottom: 1.2rem;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 6px;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 14px;
            font-family: inherit;
            transition: var(--transition);
            outline: none;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0,86,179,0.1);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        .btn-submit {
            width: 100%;
            padding: 14px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-submit:hover {
            background: var(--primary-dark);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.6);
            padding: 4rem 2rem 2rem;
        }

        .footer-grid {
            max-width: 1280px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-brand p {
            font-size: 14px;
            margin-top: 1rem;
            line-height: 1.8;
        }

        .footer h5 {
            color: white;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 1.2rem;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.6rem;
        }

        .footer-links a {
            color: rgba(255,255,255,0.5);
            text-decoration: none;
            font-size: 14px;
            transition: var(--transition);
        }

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

        .footer-bottom {
            max-width: 1280px;
            margin: 0 auto;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.08);
            text-align: center;
            font-size: 13px;
        }

        /* ===== Scroll to Top ===== */
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(0,86,179,0.3);
            z-index: 999;
            border: none;
        }

        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .scroll-top:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
        }

        /* ===== Image Lightbox Overlay (for cert clicks) ===== */
        .lightbox {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.9);
            z-index: 2000;
            display: none;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        .lightbox.active {
            display: flex;
        }

        .lightbox img {
            max-width: 90%;
            max-height: 90vh;
            border-radius: 8px;
            box-shadow: 0 0 60px rgba(0,0,0,0.5);
        }

        .lightbox-close {
            position: absolute;
            top: 2rem;
            right: 2rem;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(255,255,255,0.15);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            border: none;
            font-size: 24px;
            transition: var(--transition);
        }

        .lightbox-close:hover {
            background: rgba(255,255,255,0.3);
        }

        /* ===== Mobile Responsive ===== */
        @media (max-width: 1024px) {
            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-left p { margin: 0 auto 2.5rem; }
            .hero-buttons { justify-content: center; }
            .hero-stats { max-width: 400px; margin: 0 auto; }
            .about-grid { grid-template-columns: 1fr; }
            .contact-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .qc-grid { grid-template-columns: 1fr 1fr; }
            .workshop-gallery { grid-template-columns: 1fr 1fr; }
            .nav-links { gap: 1rem; }
            .nav-links a { font-size: 13px; }
        }

        @media (max-width: 768px) {
            .nav-links { display: none; }
            .mobile-toggle { display: flex; }
            .nav-links.active {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: white;
                padding: 2rem;
                box-shadow: var(--shadow-lg);
                gap: 1.5rem;
            }
            .section { padding: 4rem 1.5rem; }
            .hero-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }
            .stat-card { padding: 1.5rem 1rem; }
            .about-features { grid-template-columns: 1fr; }
            .about-gallery { grid-template-columns: 1fr; grid-template-rows: auto; aspect-ratio: auto; }
            .about-gallery-item:first-child { grid-row: auto; }
            .about-gallery-item { aspect-ratio: 16/9; }
            .form-row { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
            .process-steps { grid-template-columns: 1fr 1fr; }
            .qc-grid { grid-template-columns: 1fr; }
            .workshop-gallery { grid-template-columns: 1fr; }
            .cert-grid { grid-template-columns: 1fr; }
            .workshop-hero { aspect-ratio: 16/9; }
        }

        @media (max-width: 480px) {
            .hero-stats { grid-template-columns: 1fr; }
            .process-steps { grid-template-columns: 1fr; }
            .products-grid { grid-template-columns: 1fr; }
        }

        /* ===== Animations ===== */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .fade-in-delay-1 { transition-delay: 0.1s; }
        .fade-in-delay-2 { transition-delay: 0.2s; }
        .fade-in-delay-3 { transition-delay: 0.3s; }
        .fade-in-delay-4 { transition-delay: 0.4s; }

/* ===== Breadcrumb Navigation ===== */
.breadcrumb {
    background: var(--bg-light);
    padding: 1rem 0;
    margin-top: 72px;
    border-bottom: 1px solid var(--border);
}

.breadcrumb-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    font-size: 0.9rem;
    color: var(--text-light);
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-list a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb-list a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.breadcrumb-list .separator {
    color: var(--text-light);
    font-size: 0.8rem;
}

.breadcrumb-list .current {
    color: var(--text-body);
    font-weight: 500;
}

/* ===== FAQ Page Styles ===== */
.faq-page {
    padding: 3rem 0 4rem;
}

.faq-page .section-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

.faq-page .faq-header {
    text-align: center;
    margin-bottom: 3rem;
}

.faq-page .faq-header h1 {
    font-size: 2.2rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-weight: 700;
}

.faq-page .faq-header p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
}

.faq-category {
    margin-bottom: 2.5rem;
}

.faq-category-title {
    font-size: 1.4rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
    font-weight: 600;
}

.faq-category-title svg {
    vertical-align: middle;
    margin-right: 0.5rem;
}

/* ===== Product Detail Page Styles ===== */
.product-detail {
    padding: 2rem 0 4rem;
}

.product-detail .section-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

.product-detail-header {
    margin-bottom: 2rem;
}

.product-detail-header h1 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.product-detail-header .product-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.product-detail-images {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.product-detail-images .main-image {
    width: 100%;
    border-radius: var(--radius);
    aspect-ratio: 4/3;
    object-fit: cover;
    cursor: pointer;
    transition: var(--transition);
}

.product-detail-images .main-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.product-detail-images .thumbnail-row {
    display: flex;
    gap: 0.75rem;
}

.product-detail-images .thumbnail {
    width: 100px;
    height: 75px;
    border-radius: 8px;
    object-fit: cover;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
}

.product-detail-images .thumbnail:hover,
.product-detail-images .thumbnail.active {
    border-color: var(--primary);
}

.product-detail-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.product-detail-info .description {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-body);
}

.product-detail-info .description p {
    margin-bottom: 1rem;
}

.product-features-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.product-features-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: var(--text-body);
}

.product-features-list li::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    background: var(--primary-light);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 2px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%230056b3' stroke-width='3'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

/* ===== Specifications Table ===== */
.specs-section {
    margin: 3rem 0;
}

.specs-section h2 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.specs-table thead {
    background: var(--primary);
    color: white;
}

.specs-table th {
    padding: 1rem 1.5rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
}

.specs-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-body);
}

.specs-table tbody tr:last-child td {
    border-bottom: none;
}

.specs-table tbody tr:hover {
    background: var(--bg-light);
}

.specs-table .param-name {
    font-weight: 500;
    color: var(--text-dark);
    width: 30%;
}

/* ===== Application Scenarios ===== */
.applications-section {
    margin: 3rem 0;
}

.applications-section h2 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.application-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.application-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-4px);
}

.application-card .app-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.application-card h4 {
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.application-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== CTA Section ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius);
    padding: 3rem;
    text-align: center;
    color: white;
    margin: 3rem 0;
}

.cta-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.cta-section p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-buttons .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.cta-buttons .btn-white {
    background: white;
    color: var(--primary);
}

.cta-buttons .btn-white:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
}

.cta-buttons .btn-outline-white {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.5);
}

.cta-buttons .btn-outline-white:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
}

/* ===== Back to Products Link ===== */
.back-to-products {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.back-to-products:hover {
    color: var(--primary-dark);
    gap: 0.75rem;
}

.back-to-products svg {
    transition: transform 0.3s ease;
}

.back-to-products:hover svg {
    transform: translateX(-4px);
}

/* ===== Product FAQ Section ===== */
.product-faq-section {
    margin: 3rem 0;
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 2.5rem;
}

.product-faq-section h2 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

/* ===== Page Header (for standalone pages) ===== */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
    margin-top: 72px;
}

.page-header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
}

.page-header .section-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===== Additional Responsive Styles ===== */
@media (max-width: 1024px) {
    .product-detail-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .product-detail-images {
        order: -1;
    }
}

@media (max-width: 768px) {
    .breadcrumb-list {
        font-size: 0.85rem;
        flex-wrap: wrap;
    }
    
    .faq-page .faq-header h1,
    .page-header h1 {
        font-size: 1.75rem;
    }
    
    .product-detail-header h1 {
        font-size: 1.6rem;
    }
    
    .specs-table {
        font-size: 0.9rem;
    }
    
    .specs-table th,
    .specs-table td {
        padding: 0.75rem 1rem;
    }
    
    .cta-section {
        padding: 2rem 1.5rem;
    }
    
    .cta-section h2 {
        font-size: 1.4rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .applications-grid {
        grid-template-columns: 1fr;
    }
    
    .product-faq-section {
        padding: 1.5rem;
    }
    
    .product-detail-images .thumbnail-row {
        flex-wrap: wrap;
    }
    
    .product-detail-images .thumbnail {
        width: 80px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .faq-question {
        padding: 1rem;
        font-size: 0.95rem;
    }
    
    .faq-answer-inner {
        padding: 0 1rem 1rem;
    }
    
    .product-detail {
        padding: 1rem 0 2rem;
    }
    
    .specs-table th,
    .specs-table td {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
}