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

        html, body {
            height: 100%;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f9f9f9;
        }

        .bh040-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Navigation */
        .bh040-navbar {
            background: linear-gradient(135deg, #0088cc 0%, #005fa3 100%);
            padding: 0;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .bh040-navbar-wrapper {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .bh040-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: white;
            font-size: 20px;
            font-weight: bold;
            transition: opacity 0.3s;
        }

        .bh040-logo:hover {
            opacity: 0.8;
        }

        .bh040-logo img {
            height: 45px;
            width: auto;
        }

        .bh040-nav-menu {
            display: flex;
            gap: 0;
            list-style: none;
        }

        .bh040-nav-item {
            margin: 0;
        }

        .bh040-nav-link {
            display: block;
            color: white;
            text-decoration: none;
            padding: 10px 20px;
            transition: background-color 0.3s, color 0.3s;
            font-size: 14px;
            font-weight: 500;
        }

        .bh040-nav-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            color: #fff;
        }

        /* Hero Section */
        .bh040-hero {
            background: linear-gradient(135deg, #0088cc 0%, #005fa3 100%);
            color: white;
            padding: 80px 20px;
            text-align: center;
        }

        .bh040-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .bh040-hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            font-weight: 700;
            line-height: 1.2;
        }

        .bh040-hero-subtitle {
            font-size: 20px;
            margin-bottom: 30px;
            opacity: 0.95;
            line-height: 1.5;
        }

        .bh040-hero-buttons {
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .bh040-btn-primary {
            background-color: #fff;
            color: #0088cc;
            padding: 16px 40px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            display: inline-block;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .bh040-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
        }

        .bh040-btn-secondary {
            background-color: transparent;
            color: white;
            padding: 16px 40px;
            border: 2px solid white;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            display: inline-block;
        }

        .bh040-btn-secondary:hover {
            background-color: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        /* Features Section */
        .bh040-features {
            padding: 80px 20px;
            background-color: white;
        }

        .bh040-section-title {
            font-size: 36px;
            text-align: center;
            margin-bottom: 50px;
            color: #333;
            font-weight: 700;
        }

        .bh040-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .bh040-feature-card {
            background: white;
            padding: 30px;
            border-radius: 12px;
            border: 1px solid #e0e0e0;
            transition: all 0.3s;
            text-align: center;
        }

        .bh040-feature-card:hover {
            box-shadow: 0 8px 24px rgba(0, 136, 204, 0.15);
            transform: translateY(-5px);
            border-color: #0088cc;
        }

        .bh040-feature-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #0088cc 0%, #005fa3 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 28px;
        }

        .bh040-feature-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: #333;
        }

        .bh040-feature-desc {
            font-size: 14px;
            color: #666;
            line-height: 1.6;
        }

        /* Platform Info Section */
        .bh040-platform {
            padding: 80px 20px;
            background-color: #f5f7fa;
        }

        .bh040-platform-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .bh040-platform-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .bh040-platform-content h2 {
            font-size: 32px;
            margin-bottom: 20px;
            color: #333;
            font-weight: 700;
        }

        .bh040-platform-list {
            list-style: none;
            margin-bottom: 30px;
        }

        .bh040-platform-item {
            padding: 12px 0;
            border-bottom: 1px solid #e0e0e0;
            font-size: 15px;
            color: #555;
            display: flex;
            align-items: center;
        }

        .bh040-platform-item:last-child {
            border-bottom: none;
        }

        .bh040-platform-item::before {
            content: "✓";
            color: #0088cc;
            font-weight: bold;
            margin-right: 12px;
            font-size: 18px;
        }

        .bh040-platform-image {
            text-align: center;
        }

        .bh040-platform-image img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
        }

        /* Installation Guide */
        .bh040-guide {
            padding: 80px 20px;
            background-color: white;
        }

        .bh040-guide-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .bh040-guide-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .bh040-step-card {
            background: #f9f9f9;
            padding: 30px;
            border-radius: 12px;
            border-left: 4px solid #0088cc;
        }

        .bh040-step-number {
            background: linear-gradient(135deg, #0088cc 0%, #005fa3 100%);
            color: white;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 18px;
            margin-bottom: 15px;
        }

        .bh040-step-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
            color: #333;
        }

        .bh040-step-desc {
            font-size: 14px;
            color: #666;
            line-height: 1.6;
        }

        /* Compatibility Section */
        .bh040-compatibility {
            padding: 80px 20px;
            background-color: #f5f7fa;
        }

        .bh040-compat-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .bh040-compat-table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            margin-top: 30px;
        }

        .bh040-compat-table th {
            background: linear-gradient(135deg, #0088cc 0%, #005fa3 100%);
            color: white;
            padding: 18px;
            text-align: left;
            font-weight: 600;
            font-size: 15px;
        }

        .bh040-compat-table td {
            padding: 16px 18px;
            border-bottom: 1px solid #e0e0e0;
            font-size: 14px;
            color: #555;
        }

        .bh040-compat-table tr:last-child td {
            border-bottom: none;
        }

        .bh040-compat-table tr:hover {
            background-color: #f9f9f9;
        }

        .bh040-compat-check {
            color: #27ae60;
            font-weight: 600;
        }

        /* CTA Section */
        .bh040-cta {
            background: linear-gradient(135deg, #0088cc 0%, #005fa3 100%);
            color: white;
            padding: 60px 20px;
            text-align: center;
        }

        .bh040-cta-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .bh040-cta-title {
            font-size: 36px;
            margin-bottom: 20px;
            font-weight: 700;
        }

        .bh040-cta-desc {
            font-size: 18px;
            margin-bottom: 30px;
            opacity: 0.95;
            line-height: 1.5;
        }

        .bh040-cta-buttons {
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .bh040-btn-cta {
            background-color: white;
            color: #0088cc;
            padding: 16px 40px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            text-decoration: none;
            display: inline-block;
        }

        .bh040-btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
        }

        /* Footer */
        .bh040-footer {
            background-color: #1a1a1a;
            color: #999;
            padding: 50px 20px 20px;
        }

        .bh040-footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .bh040-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .bh040-footer-section h3 {
            color: white;
            margin-bottom: 15px;
            font-size: 16px;
        }

        .bh040-footer-links {
            list-style: none;
        }

        .bh040-footer-link {
            margin-bottom: 10px;
        }

        .bh040-footer-link a {
            color: #999;
            text-decoration: none;
            transition: color 0.3s;
            font-size: 14px;
        }

        .bh040-footer-link a:hover {
            color: #0088cc;
        }

        .bh040-footer-bottom {
            border-top: 1px solid #333;
            padding-top: 30px;
            text-align: center;
            color: #666;
            font-size: 13px;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .bh040-navbar-wrapper {
                flex-direction: column;
                height: auto;
                padding: 15px 20px;
            }

            .bh040-logo {
                margin-bottom: 15px;
            }

            .bh040-nav-menu {
                flex-direction: column;
                width: 100%;
                gap: 0;
            }

            .bh040-nav-link {
                padding: 12px 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }

            .bh040-hero h1 {
                font-size: 32px;
            }

            .bh040-hero-subtitle {
                font-size: 16px;
            }

            .bh040-hero-buttons {
                flex-direction: column;
                align-items: center;
            }

            .bh040-btn-primary, .bh040-btn-secondary {
                width: 100%;
                max-width: 300px;
            }

            .bh040-section-title {
                font-size: 28px;
            }

            .bh040-platform-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .bh040-cta-title {
                font-size: 28px;
            }

            .bh040-cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .bh040-btn-cta {
                width: 100%;
                max-width: 300px;
            }

            .bh040-guide-steps {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            .bh040-hero {
                padding: 50px 20px;
            }

            .bh040-hero h1 {
                font-size: 24px;
            }

            .bh040-features {
                padding: 50px 20px;
            }

            .bh040-platform {
                padding: 50px 20px;
            }

            .bh040-guide {
                padding: 50px 20px;
            }

            .bh040-compatibility {
                padding: 50px 20px;
            }

            .bh040-cta {
                padding: 40px 20px;
            }

            .bh040-section-title {
                font-size: 22px;
            }

            .bh040-compat-table th,
            .bh040-compat-table td {
                padding: 12px;
                font-size: 13px;
            }
        }