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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

h1 {
    margin-bottom: 30px;
    color: #1e88e5;
    font-size: 24px;
}

.scan-area {
    position: relative;
    width: 100%;
    height: 300px;
    margin-bottom: 20px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    background-color: #f9f9f9;
}

#camera-container {
    width: 100%;
    height: 100%;
}

#video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#scan-placeholder {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
}

#scan-placeholder img {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
}

.btn {
    background-color: #1e88e5;
    color: white;
    border: none;
    border-radius: 5px;
    padding: 12px 20px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
    width: 100%;
    margin-top: 10px;
}

.btn:hover {
    background-color: #1976d2;
}

#stop-button {
    background-color: #e53935;
}

#stop-button:hover {
    background-color: #d32f2f;
}

#scan-result {
    padding: 20px;
    text-align: center;
}

#result-content {
    margin-top: 10px;
    word-break: break-all;
    font-size: 14px;
    color: #1e88e5;
}