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

body {
    font-family: "Arial", sans-serif;
    background: #f0f0f0;
    min-height: 100vh;
    color: #ffffff;
    overflow-x: hidden;
    position: relative;
}

.tech-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 25% 25%, #087DD722 0%, transparent 50%), radial-gradient(circle at 75% 75%, #ff006622 0%, transparent 50%);
    animation: techPulse 4s ease-in-out infinite alternate;
    z-index: -1;
}

@keyframes techPulse {
    0% {
        opacity: 0.3;
    }
    100% {
        opacity: 0.7;
    }
}

.grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(0, 212, 255, 0.1) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 212, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -1;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
    position: relative;
    z-index: 10;
}

.header {
    margin: 40px 0 60px 0;
}

.logo {
    width: 120px;
    height: 120px;
    margin: 0 auto 30px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: white;
}

.logo img {
    max-width: 60%;
}

.title {
    font-size: 2.5em;
    font-weight: bold;
    margin-bottom: 15px;
    background: linear-gradient(45deg, #087DD7, #23A9EB);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.2em;
    color: #8e8d8d;
    margin-bottom: 50px;
}

.download-section {
    margin: 60px 0;
}

.download-btn {
    background: linear-gradient(45deg, #087DD7, #23A9EB);
    border: none;
    padding: 18px 40px;
    font-size: 1.3em;
    font-weight: bold;
    color: white;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
    text-decoration: none;
    display: inline-block;
    position: relative;
    overflow: hidden;
    text-decoration: none;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 212, 255, 0.5);
}

.download-btn:before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.download-btn:hover:before {
    left: 100%;
}

.qr-section {
    display: none;
    margin: 60px 0;
}

.qr-tips {
    color: #ff3333;
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 0 0 10px rgba(255, 51, 51, 0.5);
}

.qr-code {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    border: 3px solid #087DD7;
    border-radius: 15px;
    background: white;
    padding: 10px;
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 60px 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid #23A9EB;
    border-radius: 15px;
    padding: 30px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: #087DD7;
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.1);
}

.feature-icon {
    font-size: 2.5em;
    margin-bottom: 15px;
    color: #087DD7;
}

.feature-title {
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 10px;
    color: #333333;
}

.feature-desc {
    color: #8e8d8d;
    line-height: 1.6;
}

#down_tips {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.tips-content {
    background: rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 20px;
    border: 2px solid #087DD7;
    max-width: 350px;
    backdrop-filter: blur(10px);
}

.tips-title {
    font-size: 1.5em;
    color: #ff3333;
    margin-bottom: 20px;
}

.tips-text {
    color: #ffffff;
    margin-bottom: 30px;
    line-height: 1.6;
}

.tips-btn {
    background: #087DD7;
    border: none;
    padding: 12px 30px;
    color: white;
    border-radius: 25px;
    cursor: pointer;
    font-weight: bold;
}

#imgtips {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    display: none;
    justify-content: center;
    align-items: center;
}

#qrcode img {
    width: 100%;
    height: 100%;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .title {
        font-size: 2em;
    }

    .logo {
        width: 100px;
        height: 100px;
        font-size: 50px;
    }

    .download-btn {
        padding: 15px 30px;
        font-size: 1.1em;
    }

    .features {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}