.btn {
    border: none;
    cursor: pointer;
    font: inherit;
    padding: 1rem;
    margin: 0;
    background-color: var(--color-primary);
    color: var(--color-on-primary);
    border-radius: 0.5rem;
    box-shadow: 0 1px 0.5rem 0 rgba(0, 0, 102, 0.5);
    transition: transform 100ms ease, box-shadow 200ms ease, opacity 200ms ease;
}

.btn:not(:disabled):hover:not(:active) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 102, 0.3);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn:not(:disabled):active {
    transform: translateY(0);
}

.nav__icon, 
.nav__cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 150ms ease, box-shadow 150ms ease, opacity 150ms ease;
}

.nav__icon:hover {
    transform: translateY(-2px);
    opacity: 0.85;
}

.nav__icon:active {
    transform: translateY(0);
}

.nav__cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.nav__cta:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}