* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #1a1a1a;
    color: #ffffff;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: #2d2d2d;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 500px;
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #4a9eff;
}

.input-section {
    margin-bottom: 2rem;
}

select, input, button {
    width: 100%;
    padding: 0.8rem;
    margin: 0.5rem 0;
    border: none;
    border-radius: 0.5rem;
    background-color: #3d3d3d;
    color: #ffffff;
    font-size: 1rem;
}

input::placeholder {
    color: #888;
}

button {
    background-color: #4a9eff;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #3a7fd9;
}

.qr-output {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

#qr-code {
    background-color: #ffffff;
    padding: 1rem;
    border-radius: 0.5rem;
}

.hidden {
    display: none;
}

#download-btn {
    background-color: #45a049;
}

#download-btn:hover {
    background-color: #3d8b41;
}