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

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

    .header {
        background: #000;
        text-align: center;
        padding: 1rem 1rem;
        position: relative;
        overflow: hidden;
    }

    .header::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 100px;
        background: linear-gradient(to bottom, transparent, #000);
        pointer-events: none;
    }

    .logo {
        width: 500px;
        max-width: 90%;
        height: auto;
        margin: 0 auto;
        display: block;
        animation: fadeInUp 1s ease-out;
    }

    .container {
        max-width: 1400px;
        margin: 0 auto;
        padding: 2rem 1rem;
    }

    .intro {
        text-align: center;
        max-width: 800px;
        margin: 4rem auto;
        padding: 0 1rem;
        animation: fadeIn 1s ease-out;
    }

    .intro h2 {
        font-size: 2.5rem;
        margin-bottom: 1.5rem;
        color: #000;
    }

    .intro p {
        font-size: 1.2rem;
        color: #666;
        margin-bottom: 2rem;
    }

    .features {
        display: flex;
        flex-direction: column;
        gap: 6rem;
        margin: 4rem 0;
    }

    .feature {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
        align-items: center;
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.6s ease-out;
    }

    .feature.visible {
        opacity: 1;
        transform: translateY(0);
    }

    .feature:nth-child(even) {
        direction: rtl;
    }

    .feature-content {
        direction: ltr;
        padding: 2rem;
    }

    .feature-content h2 {
        font-size: 2.2rem;
        margin-bottom: 1.5rem;
        color: #000;
    }

    .feature-content p {
        font-size: 1.1rem;
        color: #666;
        line-height: 1.8;
    }

    .feature img {
        width: 100%;
        height: auto;
        border-radius: 16px;
        box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
        transition: all 0.5s ease;
    }

    .feature:hover img {
        transform: scale(1.02) translateY(-5px);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    }

    .downloads {
        text-align: center;
        margin: 6rem 0;
        padding: 6rem;
        background: linear-gradient(to bottom, #f8f8f8, #fff);
        border-radius: 24px;
        animation: fadeIn 1s ease-out;
    }

    .downloads h2 {
        font-size: 2.5rem;
        margin-bottom: 1.5rem;
        color: #000;
    }

    .downloads p {
        font-size: 1.2rem;
        color: #666;
        margin-bottom: 3rem;
    }

    .download-btn {
        display: inline-block;
        background: #000;
        color: white;
        padding: 1.2rem 3rem;
        margin: 1rem;
        border-radius: 12px;
        text-decoration: none;
        font-size: 1.2rem;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .download-btn::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(255, 255, 255, 0.1);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .download-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    }

    .download-btn:hover::after {
        transform: translateX(0);
    }

    .mobile-notice {
        display: none;
        text-align: center;
        background: #f8f8f8;
        padding: 2rem;
        border-radius: 12px;
        margin: 2rem 0;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(40px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @media (max-width: 1024px) {
        .feature {
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        .feature:nth-child(even) {
            direction: ltr;
        }

        .feature-content {
            padding: 1rem;
        }

        .downloads {
            padding: 3rem 1.5rem;
        }
    }

    @media (max-width: 768px) {
        .header {
            padding: 4rem 1rem;
        }

        .intro h2 {
            font-size: 2rem;
        }

        .feature-content h2 {
            font-size: 1.8rem;
        }

        .downloads {
            display: none;
        }

        .mobile-notice {
            display: block;
        }
    }


    .logo-container {
        text-align: center;
        color: white;
        padding: 2rem;
        opacity: 0;
        animation: fadeIn 1s ease-out forwards;
    }

    .logo-title {
        display: inline-block;
        font-size: 3.5rem;
        font-weight: 300;
        letter-spacing: 2px;
        padding: 1rem 2rem;
        border: 2px solid rgba(255, 255, 255, 0.9);
        position: relative;
        margin-bottom: 1rem;
        animation: borderGlow 2s ease-in-out infinite;
    }

    .logo-subtitle-en {
        font-size: 1.2rem;
        font-weight: 300;
        letter-spacing: 1px;
        margin-bottom: 0.5rem;
        opacity: 0.9;
    }

    .logo-subtitle-cn {
        font-size: 1.1rem;
        font-weight: 300;
        opacity: 0.8;
    }


    .ai-badge {
        position: absolute;
        top: 28px;
        right: 20px;
        width: 20px;
        height: 20px;
        background: transparent;
        border: 2px solid #2ecc40;
        color: #2ecc40;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 10px;
        font-weight: bold;
        z-index: 2;
        box-shadow: none;
        letter-spacing: 0.5px;
        pointer-events: none;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes borderGlow {
        0%, 100% {
            box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
        }
        50% {
            box-shadow: 0 0 20px rgba(255, 255, 255, 0.4);
        }
    }

    @media (max-width: 768px) {
        .logo-title {
            font-size: 2.5rem;
            padding: 0.8rem 1.5rem;
        }
        
        .logo-subtitle-en {
            font-size: 1rem;
        }
        
        .logo-subtitle-cn {
            font-size: 0.9rem;
        }
    }