/* 让页面全屏并居中 */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

/* 用 flex 居中整个页面 */
body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(120deg, #83a4d4, #b6fbff);
    font-family: "Helvetica Neue", Arial, sans-serif;
}

/* 内容容器 */
.container {
    text-align: center;
    background: white;
    padding: 40px 60px;
    border-radius: 20px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    max-width: 400px;
    width: 90%;
    box-sizing: border-box;
}

.logo {
    width: 100px;
    margin-bottom: 16px;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

p {
    color: #555;
    margin-bottom: 20px;
    font-size: 14px;
}

/* 二维码部分 */
.qrcode-section {
    margin: 20px 0;
}

.qrcode {
    width: 160px;
    height: 160px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* 按钮部分 */
.button-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 20px;
}

button {
    background: #0078ff;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #005fcc;
}

#androidBtn {
    background: #00b894;
}

#androidBtn:hover {
    background: #009874;
}

/* 手机端优化 */
@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }
    .qrcode {
        width: 140px;
        height: 140px;
    }
    h1 {
        font-size: 20px;
    }
}