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

        html, body {
            height: 100%;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            color: #333;
            line-height: 1.6;
            background-color: #f8f9fa;
        }

        .eb31-header-wrapper {
            background-color: #ffffff;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .eb31-header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .eb31-logo-section {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

        .eb31-logo-img {
            width: 40px;
            height: 40px;
        }

        .eb31-logo-text {
            font-size: 18px;
            font-weight: 600;
            color: #0066cc;
            text-decoration: none;
        }

        .eb31-nav-menu {
            display: flex;
            gap: 30px;
            list-style: none;
        }

        .eb31-nav-link {
            color: #333;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
            padding: 8px 0;
            border-bottom: 2px solid transparent;
        }

        .eb31-nav-link:hover {
            color: #0066cc;
            border-bottom-color: #0066cc;
        }

        .eb31-main-content {
            flex: 1;
        }

        .eb31-hero-section {
            background: linear-gradient(135deg, #0066cc 0%, #0052a3 100%);
            color: white;
            padding: 80px 20px;
            text-align: center;
        }

        .eb31-hero-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .eb31-hero-title {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        .eb31-hero-subtitle {
            font-size: 20px;
            font-weight: 300;
            margin-bottom: 40px;
            opacity: 0.95;
        }

        .eb31-download-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .eb31-btn-primary {
            background-color: #ff6b35;
            color: white;
            padding: 16px 40px;
            font-size: 16px;
            font-weight: 600;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            text-decoration: none;
            display: inline-block;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
        }

        .eb31-btn-primary:hover {
            background-color: #ff5520;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(255, 107, 53, 0.5);
        }

        .eb31-btn-secondary {
            background-color: transparent;
            color: white;
            padding: 16px 40px;
            font-size: 16px;
            font-weight: 600;
            border: 2px solid white;
            border-radius: 6px;
            cursor: pointer;
            text-decoration: none;
            display: inline-block;
            transition: all 0.3s ease;
        }

        .eb31-btn-secondary:hover {
            background-color: rgba(255, 255, 255, 0.1);
            transform: translateY(-2px);
        }

        .eb31-version-info {
            font-size: 14px;
            opacity: 0.9;
            margin-top: 20px;
        }

        .eb31-features-section {
            max-width: 1200px;
            margin: 0 auto;
            padding: 80px 20px;
        }

        .eb31-section-title {
            font-size: 36px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 50px;
            color: #333;
        }

        .eb31-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 60px;
        }

        .eb31-feature-card {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            text-align: center;
            transition: all 0.3s ease;
        }

        .eb31-feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }

        .eb31-feature-icon {
            font-size: 48px;
            margin-bottom: 20px;
            display: inline-block;
        }

        .eb31-feature-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 15px;
            color: #333;
        }

        .eb31-feature-desc {
            font-size: 14px;
            color: #666;
            line-height: 1.8;
        }

        .eb31-download-section {
            background-color: #f0f4f9;
            padding: 80px 20px;
        }

        .eb31-download-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .eb31-platforms-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .eb31-platform-card {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
            text-align: center;
        }

        .eb31-platform-icon {
            font-size: 40px;
            margin-bottom: 15px;
        }

        .eb31-platform-name {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 10px;
            color: #333;
        }

        .eb31-platform-info {
            font-size: 12px;
            color: #999;
            margin-bottom: 15px;
        }

        .eb31-platform-btn {
            background-color: #0066cc;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            text-decoration: none;
            display: inline-block;
            transition: all 0.3s ease;
        }

        .eb31-platform-btn:hover {
            background-color: #0052a3;
            transform: translateY(-2px);
        }

        .eb31-requirements-section {
            background: white;
            padding: 40px;
            border-radius: 8px;
            margin-bottom: 40px;
        }

        .eb31-requirements-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 25px;
            color: #333;
        }

        .eb31-requirements-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .eb31-requirement-item {
            padding: 20px;
            background: #f8f9fa;
            border-radius: 6px;
        }

        .eb31-requirement-label {
            font-weight: 600;
            color: #0066cc;
            margin-bottom: 8px;
            font-size: 14px;
        }

        .eb31-requirement-value {
            color: #666;
            font-size: 14px;
        }

        .eb31-faq-section {
            max-width: 1200px;
            margin: 0 auto;
            padding: 80px 20px;
        }

        .eb31-faq-list {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        }

        .eb31-faq-item {
            border-bottom: 1px solid #eee;
            padding: 0;
        }

        .eb31-faq-item:last-child {
            border-bottom: none;
        }

        .eb31-faq-question {
            padding: 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: #333;
            transition: background-color 0.3s ease;
            user-select: none;
        }

        .eb31-faq-question:hover {
            background-color: #f8f9fa;
        }

        .eb31-faq-arrow {
            font-size: 20px;
            transition: transform 0.3s ease;
        }

        .eb31-faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s ease;
            color: #666;
            line-height: 1.8;
        }

        .eb31-faq-item.eb31-active .eb31-faq-answer {
            padding: 20px;
            max-height: 500px;
        }

        .eb31-faq-item.eb31-active .eb31-faq-arrow {
            transform: rotate(180deg);
        }

        .eb31-cta-section {
            background: linear-gradient(135deg, #0066cc 0%, #0052a3 100%);
            color: white;
            padding: 60px 20px;
            text-align: center;
        }

        .eb31-cta-title {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .eb31-cta-subtitle {
            font-size: 18px;
            margin-bottom: 40px;
            opacity: 0.95;
        }

        .eb31-footer {
            background-color: #1a1a1a;
            color: #999;
            padding: 50px 20px 30px;
            font-size: 14px;
        }

        .eb31-footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .eb31-footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 30px;
        }

        .eb31-footer-column {
            line-height: 2;
        }

        .eb31-footer-title {
            color: white;
            font-weight: 600;
            margin-bottom: 15px;
            font-size: 15px;
        }

        .eb31-footer-link {
            color: #999;
            text-decoration: none;
            transition: color 0.3s ease;
            display: block;
        }

        .eb31-footer-link:hover {
            color: #0066cc;
        }

        .eb31-footer-divider {
            border-top: 1px solid #333;
            margin: 30px 0;
            padding-top: 30px;
        }

        .eb31-footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .eb31-copyright {
            color: #666;
            font-size: 13px;
        }

        .eb31-social-links {
            display: flex;
            gap: 20px;
        }

        .eb31-social-link {
            color: #999;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .eb31-social-link:hover {
            color: #0066cc;
        }

        @media (max-width: 768px) {
            .eb31-nav-menu {
                display: none;
            }

            .eb31-hero-title {
                font-size: 32px;
            }

            .eb31-hero-subtitle {
                font-size: 16px;
            }

            .eb31-download-buttons {
                flex-direction: column;
            }

            .eb31-btn-primary, .eb31-btn-secondary {
                width: 100%;
            }

            .eb31-section-title {
                font-size: 28px;
            }

            .eb31-cta-title {
                font-size: 28px;
            }

            .eb31-features-grid {
                grid-template-columns: 1fr;
            }

            .eb31-platforms-grid {
                grid-template-columns: 1fr;
            }

            .eb31-footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 480px) {
            .eb31-header-container {
                height: 60px;
            }

            .eb31-logo-text {
                display: none;
            }

            .eb31-hero-section {
                padding: 50px 15px;
            }

            .eb31-hero-title {
                font-size: 24px;
            }

            .eb31-features-section, .eb31-faq-section {
                padding: 40px 15px;
            }

            .eb31-section-title {
                font-size: 22px;
                margin-bottom: 30px;
            }
        }