/* 
         * ===========================================
         * B2B Style - Light Theme with Orange #ff770f
         * ===========================================
         */
        :root {
            /* Primary Orange - B2B Enterprise */
            --primary-orange: #ff770f;
            --primary-orange-dark: #e66a00;
            --primary-orange-light: #ff9640;
            
            /* Light Theme Colors */
            --bg-white: #ffffff;
            --bg-light: #f8f9fa;
            --bg-light-gray: #f0f2f5;
            --bg-card: #ffffff;
            --bg-card-hover: #f5f5f5;
            
            /* Text Colors */
            --text-dark: #1a1a1a;
            --text-gray: #666666;
            --text-light: #e0e0e0;
            --text-muted: #999999;
            
            /* Borders */
            --border-color: #e5e7eb;
            --border-light: #f0f0f0;
            
            /* Accent */
            --accent-green: #10b981;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* ===========================================
         * Hero Section - Bold & Powerful
         * ===========================================
         */
      .hero {
    padding: 44px 80px 0;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.94) 0%, rgba(255, 255, 255, 0.84) 48%, rgba(240, 242, 245, 0.52) 100%),
                url('//ueeshop.ly200-cdn.com/u_file/UPBI/UPBI407/2605/18/photo/SolutionsforEverySector-IndustrialLighting.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    overflow: hidden;
}

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(255, 119, 15, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-color), transparent);
        }

        .hero-content {
            max-width: 1400px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .hero-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 360px;
            gap: 56px;
            align-items: center;
            min-height: 480px;
            padding-bottom: 28px;
        }

        .hero-main {
            max-width: 780px;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(255, 119, 15, 0.1);
            border: 1px solid var(--primary-orange);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary-orange-light);
            margin-bottom: 24px;
            text-transform: uppercase;
            letter-spacing: 2px;
        }

        .hero h1 {
            font-size: 56px;
            font-weight: 800;
            line-height: 1.06;
            margin-bottom: 20px;
            color: var(--text-dark);
            max-width: 900px;
        }

        .hero h1 span {
            color: var(--primary-orange-light);
        }

        .hero-description {
            font-size: 18px;
            color: var(--text-gray);
            max-width: 700px;
            margin-bottom: 30px;
            line-height: 1.7;
            font-weight: 400;
        }

        .hero-actions {
            display: flex;
            gap: 20px;
            margin-bottom: 0;
        }

        .hero-proof {
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(229, 231, 235, 0.95);
            border-radius: 12px;
            box-shadow: 0 18px 48px rgba(16, 24, 40, 0.12);
            overflow: hidden;
            backdrop-filter: blur(10px);
        }

        .proof-head {
            padding: 22px 24px;
            border-bottom: 1px solid var(--border-color);
        }

        .proof-head strong {
            display: block;
            color: var(--text-dark);
            font-size: 18px;
            line-height: 1.3;
        }

        .proof-head span {
            display: block;
            margin-top: 6px;
            color: var(--text-gray);
            font-size: 13px;
        }

        .proof-list {
            list-style: none;
            padding: 8px 24px 22px;
        }

        .proof-list li {
            display: flex;
            gap: 10px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
            color: var(--text-gray);
            font-size: 14px;
        }

        .proof-list li:last-child {
            border-bottom: 0;
        }

        .proof-list b {
            flex: 0 0 auto;
            color: var(--primary-orange);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 16px 32px;
            background: var(--primary-orange);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(255, 119, 15, 0.3);
        }

        .btn-primary:hover {
            background: var(--primary-orange-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 119, 15, 0.4);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 16px 32px;
            background: transparent;
            color: var(--text-dark);
            text-decoration: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            border: 2px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .btn-secondary:hover {
            border-color: var(--primary-orange);
            color: var(--primary-orange);
            background: rgba(255, 119, 15, 0.05);
        }

        /* Stats Bar */
        .stats-section {
            padding: 0 80px;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0;
            background: var(--bg-white);
        }

        .stat-item {
            position: relative;
            padding: 28px 30px;
            border-right: 1px solid var(--border-color);
        }

        .stat-item::after {
            display: none;
        }

        .stat-item:last-child {
            border-right: 0;
        }

        .stat-number {
            font-size: 38px;
            font-weight: 800;
            color: var(--text-dark);
            line-height: 1;
            margin-bottom: 8px;
        }

        .stat-number span {
            color: var(--primary-orange);
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* ===========================================
         * Solutions Section
         * ===========================================
         */
        .solutions-section {
            padding: 84px 80px;
            background: var(--bg-white);
        }

        .section-container {
            max-width: 1400px;
            margin: 0 auto;
        }

        .section-header {
            margin-bottom: 42px;
            max-width: 760px;
        }

        .section-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--primary-orange);
            text-transform: uppercase;
            letter-spacing: 3px;
            margin-bottom: 16px;
        }

        .section-title {
            font-size: 42px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
            line-height: 1.2;
        }

        .section-description {
            font-size: 18px;
            color: var(--text-gray);
            max-width: 600px;
            line-height: 1.8;
        }

        /* ===========================================
         * Industry Grid - Large Cards
         * ===========================================
         */
        .industry-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
            margin-bottom: 80px;
        }

        .solution-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 10px;
            overflow: hidden;
            transition: all 0.4s ease;
            cursor: pointer;
        }

        .solution-card:hover {
            border-color: var(--primary-orange);
            transform: translateY(-3px);
            box-shadow: 0 18px 36px rgba(16, 24, 40, 0.1);
        }

        .card-image {
            height: 300px;
            background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
            position: relative;
            overflow: hidden;
        }

        .card-image::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 50%;
            background: linear-gradient(to top, var(--bg-card), transparent);
        }

        /* Image placeholder */
        .card-image.image-1 {
            background-image: url('//ueeshop.ly200-cdn.com/u_file/UPBI/UPBI407/2605/18/photo/SolutionsforEverySector-IndustrialLighting2.png');
            background-size: cover;
            background-position: center;
        }

        .card-image.image-2 {
            background-image: url('//ueeshop.ly200-cdn.com/u_file/UPBI/UPBI407/2605/18/photo/SolutionsforEverySector-CommercialLighting.png');
            background-size: cover;
            background-position: center;
        }

        .card-icon {
            position: absolute;
            top: 24px;
            right: 24px;
            width: 56px;
            height: 56px;
            background: rgba(255, 119, 15, 0.9);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            z-index: 2;
        }

        .card-content {
            padding: 32px;
        }

        .card-category {
            font-size: 12px;
            font-weight: 600;
            color: var(--primary-orange);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 12px;
        }

        .card-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
        }

        .card-description {
            font-size: 15px;
            color: var(--text-gray);
            margin-bottom: 20px;
            line-height: 1.7;
        }

        .card-features {
            display: flex;
            gap: 24px;
            margin-bottom: 24px;
            padding: 20px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .feature-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-gray);
        }

        .feature-item svg {
            color: var(--accent-green);
        }

        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary-orange);
            text-decoration: none;
            font-weight: 600;
            font-size: 14px;
            transition: gap 0.3s ease;
        }

        .card-link:hover {
            gap: 12px;
            color: var(--primary-orange-dark);
        }

        /* ===========================================
         * Application Grid - Compact Cards
         * ===========================================
         */
        .application-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .app-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 26px;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .app-card:hover {
            border-color: var(--primary-orange);
            background: var(--bg-card);
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(255, 119, 15, 0.1);
        }

        .app-icon {
            width: 48px;
            height: 48px;
            background: rgba(255, 119, 15, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-orange);
            margin-bottom: 20px;
        }

        .app-title {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
        }

        .app-description {
            font-size: 14px;
            color: var(--text-gray);
            margin-bottom: 16px;
            line-height: 1.6;
        }

        .app-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary-orange);
            text-decoration: none;
            font-size: 13px;
            font-weight: 600;
        }

        .app-link:hover {
            color: var(--primary-orange-dark);
        }

        /* ===========================================
         * Trust Bar - B2B Credibility
         * ===========================================
         */
        .trust-section {
            padding: 64px 80px;
            background: var(--bg-white);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .trust-content {
            max-width: 1400px;
            margin: 0 auto;
            text-align: center;
        }

        .trust-title {
            font-size: 16px;
            color: var(--text-gray);
            text-transform: uppercase;
            letter-spacing: 3px;
            margin-bottom: 40px;
            font-weight: 600;
        }

        /* 选项1：使用认证图标网格 */
        .trust-logos {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 24px;
            margin-bottom: 40px;
        }

        .trust-logo-item {
            background: var(--bg-light);
            border: 2px solid var(--border-color);
            border-radius: 12px;
            padding: 24px 16px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            cursor: pointer;
            min-height: 100px;
        }

        .trust-logo-item:hover {
            border-color: var(--primary-orange);
            transform: translateY(-4px);
            box-shadow: 0 8px 20px rgba(255, 119, 15, 0.1);
        }

        .trust-logo-icon {
            width: 40px;
            height: 40px;
            margin-bottom: 12px;
            color: #2c2c2c;
        }

        .trust-logo-text {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-gray);
            text-transform: uppercase;
            letter-spacing: 1px;
            text-align: center;
        }

        /* 选项2：使用客户案例图片网格 */
        .trust-gallery {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .trust-gallery-item {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
            cursor: pointer;
            aspect-ratio: 16/9;
            background: var(--bg-light);
            border: 2px solid var(--border-color);
        }

        .trust-gallery-item:hover {
            border-color: var(--primary-orange);
            transform: scale(1.02);
        }

        .trust-gallery-item::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60%;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
            pointer-events: none;
        }

        .trust-gallery-label {
            position: absolute;
            bottom: 16px;
            left: 16px;
            right: 16px;
            z-index: 2;
            font-size: 14px;
            font-weight: 600;
            color: white;
            text-align: left;
        }

        /* 选项3：使用图标 + 文字行 */
        .trust-badges {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 48px;
            flex-wrap: wrap;
        }

        .trust-badge-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 24px;
            background: var(--bg-light);
            border: 2px solid var(--border-color);
            border-radius: 12px;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .trust-badge-item:hover {
            border-color: var(--primary-orange);
            background: var(--bg-white);
        }

        .trust-badge-icon {
            width: 32px;
            height: 32px;
            color: var(--primary-orange);
        }

        .trust-badge-text {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-dark);
        }

        /* ===========================================
         * CTA Section
         * ===========================================
         */
        .cta-section {
            padding: 84px 80px;
            background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light-gray) 100%);
            text-align: center;
        }

        .cta-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .cta-title {
            font-size: 48px;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 20px;
        }

        .cta-description {
            font-size: 18px;
            color: var(--text-gray);
            margin-bottom: 40px;
        }

        .cta-button {
            display: inline-block;
            padding: 18px 48px;
            background: var(--primary-orange);
            color: white;
            text-decoration: none;
            border-radius: 10px;
            font-weight: 700;
            font-size: 16px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 16px rgba(255, 119, 15, 0.35);
        }

        .cta-button:hover {
            background: var(--primary-orange-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(255, 119, 15, 0.45);
        }

        /* ===========================================
         * Responsive Design - 移动端适配
         * ===========================================
         */
        
        /* 超大屏幕 (1400px以上) */
        @media (min-width: 1400px) {
            .hero h1 {
                font-size: 60px;
            }
            
            .hero-description {
                font-size: 18px;
            }
            
            .section-title {
                font-size: 48px;
            }
        }

        /* 大屏幕 (1200px - 1399px) */
        @media (max-width: 1200px) {
            .hero-layout {
                grid-template-columns: minmax(0, 1fr) 330px;
                gap: 36px;
            }

            .hero h1 {
                font-size: 50px;
            }
            
            .hero-description {
                font-size: 17px;
            }
            
            .section-title {
                font-size: 40px;
            }
            
            .industry-grid {
                gap: 24px;
            }
            
            .application-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .trust-logos {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        /* 平板 (992px - 1199px) */
        @media (max-width: 992px) {
            .hero {
                padding: 48px 40px 0;
            }

            .hero-layout {
                grid-template-columns: 1fr;
                gap: 24px;
                min-height: auto;
                padding-bottom: 34px;
            }
            
            .hero h1 {
                font-size: 42px;
            }
            
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 0;
            }
            
            .stat-item {
                min-width: 200px;
                border-bottom: 1px solid var(--border-color);
            }

            .stat-item:nth-child(2n) {
                border-right: 0;
            }

            .stat-item:nth-last-child(-n + 2) {
                border-bottom: 0;
            }

            .stats-section {
                padding: 0 40px;
            }
            
            .industry-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            
            .card-image {
                height: 250px;
            }
            
            .solutions-section {
                padding: 80px 40px;
            }
            
            .application-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            
            .app-card {
                padding: 24px;
            }
            
            .trust-section,
            .cta-section {
                padding: 80px 40px;
            }
            
            .trust-logos {
                grid-template-columns: repeat(3, 1fr);
                gap: 16px;
            }
            
            .trust-logo-item {
                padding: 20px 12px;
                min-height: 80px;
            }
            
            .trust-logo-icon {
                width: 32px;
                height: 32px;
            }
            
            .trust-logo-text {
                font-size: 11px;
            }
            
            .cta-title {
                font-size: 40px;
            }
            
            .cta-description {
                font-size: 17px;
            }
        }

        /* 大手机 (768px - 991px) */
        @media (max-width: 768px) {
            .hero {
                padding: 40px 30px 0;
                background-position: 62% center;
            }

            .hero-proof {
                display: none;
            }
            
            .hero h1 {
                font-size: 34px;
                line-height: 1.08;
            }
            
            .hero-description {
                font-size: 16px;
                margin-bottom: 24px;
            }
            
            .hero-badge {
                font-size: 11px;
                padding: 5px 12px;
            }
            
            .hero-actions {
                flex-direction: column;
                gap: 12px;
                margin-bottom: 0;
            }
            
            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
                padding: 16px 24px;
            }
            
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 0;
            }
            
            .stat-item {
                text-align: center;
                min-width: 0;
                padding: 20px 12px;
            }

            .stat-number {
                font-size: 32px;
            }

            .stat-label {
                font-size: 11px;
                line-height: 1.35;
            }

            .stats-section {
                padding: 0 30px;
            }
            
            .section-title {
                font-size: 32px;
            }
            
            .section-description {
                font-size: 16px;
            }

            .solutions-section,
            .trust-section,
            .cta-section {
                padding-top: 64px;
                padding-bottom: 64px;
            }
            
            .application-grid {
                grid-template-columns: 1fr;
            }
            
            .trust-logos {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .cta-title {
                font-size: 32px;
            }
            
            .cta-description {
                font-size: 16px;
            }
            
            .cta-button {
                padding: 16px 32px;
                font-size: 15px;
            }
        }

        /* 手机 (480px - 767px) */
        @media (max-width: 480px) {
            .hero {
                padding: 34px 20px 0;
            }
            
            .hero h1 {
                font-size: 30px;
            }
            
            .hero-description {
                font-size: 15px;
                line-height: 1.65;
            }

            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 0;
            }
            
            .stat-number {
                font-size: 28px;
            }
            
            .stat-label {
                font-size: 12px;
            }
            
            .card-content {
                padding: 22px;
            }
            
            .card-title {
                font-size: 22px;
            }
            
            .card-description {
                font-size: 14px;
            }
            
            .card-features {
                flex-direction: column;
                gap: 12px;
                padding: 16px 0;
            }

            .solutions-section,
            .trust-section,
            .cta-section {
                padding-left: 20px;
                padding-right: 20px;
                padding-top: 56px;
                padding-bottom: 56px;
            }

            .section-header {
                margin-bottom: 28px;
            }

            .industry-grid {
                gap: 18px;
                margin-bottom: 52px;
            }

            .card-image {
                height: 190px;
            }

            .stats-section {
                padding: 0 20px;
            }
            
            .app-card {
                padding: 20px;
            }
            
            .app-title {
                font-size: 17px;
            }
            
            .app-description {
                font-size: 13px;
            }
            
            .trust-title {
                font-size: 14px;
            }
            
            .trust-logos {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            
            .trust-logo-item {
                padding: 16px 10px;
                min-height: 70px;
            }
            
            .trust-logo-icon {
                width: 28px;
                height: 28px;
            }
            
            .trust-logo-text {
                font-size: 10px;
            }
            
            .cta-title {
                font-size: 28px;
            }
            
            .cta-description {
                font-size: 15px;
            }
            
            .cta-button {
                width: 100%;
                padding: 16px 24px;
            }
        }

        /* 小屏幕优化 (320px - 479px) */
        @media (max-width: 320px) {
            .hero h1 {
                font-size: 26px;
            }
            
            .hero-description {
                font-size: 15px;
            }
            
            .section-title {
                font-size: 28px;
            }
            
            .card-image {
                height: 200px;
            }
            
            .trust-logo-item {
                padding: 12px 8px;
            }
            
            .trust-logo-text {
                font-size: 9px;
            }
        }

        /* Animations */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 0.8s ease forwards;
        }

        @keyframes fadeInUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

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