body {
    font-family: system-ui, sans-serif;
    background: linear-gradient(45deg, #09203F, #537895);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #2b2b2b;
    padding: 2rem;
}
@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
.container {
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(15px);
    border-radius: 12px;
    padding: 2rem;
    width: min(900px, 94vw);
}
input[type="text"], select {
    width: 100%;
    padding: .6rem;
    margin: .5rem 0;
    border-radius: 6px;
    border: none;
}
.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.qr-preview {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 2rem;
    position: relative;
}
#qr-container canvas {
    transition: border-radius 0.3s ease;
    display: block;
}
#logo-overlay {
    position: absolute;
    display: none;
    pointer-events: none;
}
.slider-group {
    display: flex;
    flex-direction: column;
}
.slider-group label {
    font-size: 0.9rem;
    margin-bottom: .25rem;
}