:root {
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #bb86fc;
    --on-surface-color: #e0e0e0;
    --on-background-color: #e0e0e0;
    --border-color: #333;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--on-background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.container {
    width: 100%;
    max-width: 400px;
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

h1 {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--on-surface-color);
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--on-surface-color);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(187, 134, 252, 0.3);
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 0.5rem;
    width: 1.15em;
    height: 1.15em;
    cursor: pointer;
}
.checkbox-group label {
    margin-bottom: 0;
    cursor: pointer;
}


button[type="submit"] {
    width: 100%;
    padding: 0.85rem;
    background-color: var(--primary-color);
    color: #000;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
}

button[type="submit"]:hover {
    background-color: #a763fa;
}

#qrcode-container {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    background-color: #fff;
    min-height: 150px;
    border-radius: 8px;
}

#qrcode {
    display: flex;
    justify-content: center;
    align-items: center;
}

#qrcode canvas,
#qrcode img {
    max-width: 100%;
    height: auto;
}