.header {
    background-color: #2c3e50;
    color: white;
    padding: 20px 0;
}
.form-control {
    border-radius: 0;
}
.btn-primary {
    background-color: #3498db;
    border-color: #3498db;
    border-radius: 0;
}
.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
}
#results {
    margin-top: 20px;
}
.entry-row {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}
.entry-row input {
    flex: 1;
}
.variant-label {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    background-color: #3498db;
}
#add-entry {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 24px;
    line-height: 1;
    padding: 0;
    background-color: #6c757d;
    color: white;
    border: none;
}
#calculate-btn {
    background-color: #17a2b8;
    border-color: #17a2b8;
    font-size: 1.2rem;
    padding: 10px 20px;
}
.remove-entry {
    width: 30px;
    height: 30px;
    padding: 0;
    line-height: 1;
}
#chart-container {
    width: 100%;
    height: 400px;
}
#results-container, #chart-container, #density-chart-container {
    display: none;
    transition: all 0.3s ease;
}

#results-container.show, #chart-container.show, #density-chart-container.show {
    display: block;
}