body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 450px;
    text-align: center;
}

h1 {
    margin-bottom: 25px;
    font-size: 24px;
    color: #007bff;
}

.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 25px;
}

.tab-button {
    padding: 12px 24px;
    border: none;
    background-color: #e9ecef;
    cursor: pointer;
    margin: 0 8px;
    border-radius: 6px;
    font-size: 14px;
    color: #495057;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.tab-button.active {
    background-color: #007bff;
    color: #fff;
}

.tab-button:hover {
    background-color: #0056b3;
    color: #fff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: #495057;
}

input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

input:focus, select:focus {
    border-color: #007bff;
    outline: none;
}

button {
    padding: 12px 24px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

#qrcode-output, #decode-output {
    margin-top: 25px;
}

#qrcode-output img {
    margin: auto;
    max-width: 100%;
    height: auto;
}

.radio-group {
    display: flex;
    flex-direction: row;
    justify-content: center;
    margin-bottom: 20px;
    gap: 20px;
}

.radio-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: #495057;
}

.radio-group input[type="radio"] {
    margin-right: 8px;
}

#decode {
    border: 2px dashed #ced4da;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    transition: border-color 0.3s ease;
}

#decode.dragover {
    border-color: #007bff;
}

#decode-hint {
    margin-top: 20px;
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

#decode-hint p {
    margin: 5px 0;
}