form {
    max-width: 700px;
    margin-top: 2rem;
}

fieldset,
#results {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-card);
}

legend,
label {
    font-weight: bold;
}

legend {
    padding: 0 0.5rem;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 1rem;
}

label {
    display: block;
    margin-bottom: 0.4rem;
}

input {
    width: 100%;
    padding: 0.7rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font: inherit;
}

button {
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: 4px;
    background-color: var(--color-primary);
    color: #11100f;
    font: inherit;
    font-weight: bold;
    cursor: pointer;
}

button:hover {
    background-color: var(--color-primary-hover);
}

.equation {
    font-size: 1.25rem;
    font-weight: bold;
}

#errorMessage {
    min-height: 1.2rem;
    color: #ff8a80;
    font-weight: bold;
}

.chart-container {
    position: relative;
    height: 420px;
    padding: 1rem;
    border-radius: 4px;
    background-color: #ffffff;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 0.65rem;
    border: 1px solid var(--color-border);
    text-align: right;
}

th {
    background-color: var(--color-surface);
}

@media (max-width: 600px) {
    nav {
        flex-wrap: wrap;
        gap: 1rem;
    }

    .input-grid {
        grid-template-columns: 1fr;
    }

    .chart-container {
        height: 320px;
        padding: 0.25rem;
    }
}