body {
    background-color: #f8f9fa;
    min-height: 100vh;
    padding: 20px 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif;
}

.container {
    max-width: 600px;
}

.card {
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.section {
    margin: 20px auto;
    max-width: 500px;
}

.form-control {
    border-radius: 10px;
    padding: 12px;
    font-size: 16px;
}

.btn {
    border-radius: 10px;
    padding: 12px;
    font-size: 16px;
}

.list-group {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 10px;
}

.list-group-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
}

.progress {
    height: 10px;
    border-radius: 5px;
}

#pin {
    font-size: 24px;
    letter-spacing: 5px;
    text-align: center;
}

/* Mobile-specific styles */
@media (max-width: 576px) {
    .container {
        padding: 10px;
    }
    
    .card {
        margin: 10px 0;
    }
    
    .btn {
        padding: 10px;
    }
}