body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #1a1a1a;
    color: #f0f0f0;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 800px;
    background-color: #2c2c2c;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0,0,0,0.5);
}

h1, h2 {
    text-align: center;
    color: #00aaff;
}

h2 {
    border-bottom: 2px solid #00aaff;
    padding-bottom: 10px;
    margin-top: 40px;
}

.password-section {
    margin-bottom: 30px;
}

.option-group {
    text-align: center;
    margin-bottom: 20px;
}

.option-group label {
    font-size: 1.2em;
}

input[type="range"] {
    width: 80%;
    margin-top: 10px;
}

.password-block {
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
}

.password-block.light {
    background-color: #3a3a3a;
}

.password-block.dark {
    background-color: #252525;
}

.password-block h3 {
    margin-top: 0;
    color: #f0f0f0;
}

.result-box {
    display: flex;
    align-items: center;
}

.result-box input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #555;
    background-color: #444;
    color: #f0f0f0;
    border-radius: 4px;
    font-size: 1.1em;
    margin-right: 10px;
}

.result-box button {
    padding: 10px 15px;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

.result-box button.qr-btn {
    background-color: #5c6bc0;
    margin-left: 5px;
}

.result-box button.qr-btn:hover {
    background-color: #3949ab;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.7);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 300px;
    text-align: center;
    position: relative;
    border-radius: 8px;
}

.modal-content #qrcode {
    padding: 10px;
    display: inline-block;
}

.close-btn {
    color: #aaa;
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-btn:hover,
.close-btn:focus {
    color: black;
    text-decoration: none;
}