body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #2c3e50, #2980b9);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    flex-direction: column;
    text-align: center;
    position: relative;
}

.container {
    width: 90%;
    max-width: 420px;
    z-index: 2;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.button {
    background-color: #00bcd4;
    color: white;
    border: none;
    padding: 15px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 1.4rem;
    margin: 10px;
    cursor: pointer;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.button:hover {
    transform: scale(1.05);
}

.android {
    background-color: #3ddc84;
}

.ios {
    background-color: #007aff;
}

.footer {
    margin-top: 30px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer a {
    color: #ffffff;
    text-decoration: none;
    font-weight: bold;
}

.footer a:hover {
    text-decoration: underline;
}

.background-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://www.transparenttextures.com/patterns/45-degree-fabric-light.png') repeat;
    opacity: 0.1;
    z-index: -1;
}

/* logo 专属样式 */
.container img {
    width: 100px;
    height: 100px;
    border-radius: 20px;
    background: #fff;
    padding: 9px;
    margin: 0 auto 32px auto;
    box-shadow: 0 4px 18px 0 rgba(34, 98, 212, 0.16), 0 2px 8px 2px rgba(96,186,255,0.09);
    object-fit: contain;
    display: block;
}