/* Bottoni: il petrolio è riservato all'azione principale */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    padding: 0.85em 1.5em;
    border-radius: var(--radius-md);
    border: 1.5px solid transparent;
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 1rem;
    line-height: 1.1;
    letter-spacing: 0.005em;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition:
        background-color var(--dur-fast) var(--ease-out),
        border-color var(--dur-fast) var(--ease-out),
        color var(--dur-fast) var(--ease-out);
}

.btn .icon {
    font-size: 1.15em;
}

.btn-primary {
    background-color: var(--color-petrol);
    border-color: var(--color-petrol);
    color: var(--color-white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background-color: var(--color-petrol-deep);
    border-color: var(--color-petrol-deep);
    color: var(--color-white);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--color-hair-strong);
    color: var(--color-ink);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
    border-color: var(--color-ink);
    background-color: var(--color-ink);
    color: var(--color-white);
}

/* Su fondo scuro o petrolio */
.btn-light {
    background-color: var(--color-white);
    border-color: var(--color-white);
    color: var(--color-petrol);
}

.btn-light:hover,
.btn-light:focus-visible {
    background-color: var(--color-porcelain);
    border-color: var(--color-porcelain);
    color: var(--color-petrol-deep);
}

.btn-outline-light {
    background-color: transparent;
    border-color: rgba(255, 255, 255, 0.55);
    color: var(--color-white);
}

.btn-outline-light:hover,
.btn-outline-light:focus-visible {
    border-color: var(--color-white);
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
}

.btn-sm {
    padding: 0.65em 1.1em;
    font-size: 0.95rem;
}

.btn-lg {
    padding: 1em 1.8em;
    font-size: 1.05rem;
}

.btn-block {
    width: 100%;
}

.btn[disabled],
.btn[aria-busy="true"] {
    opacity: 0.7;
    cursor: progress;
}

/* Gruppo di azioni */
.actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    align-items: center;
}

/* Alias legacy */
.btn-outline {
    background-color: transparent;
    border-color: var(--color-hair-strong);
    color: var(--color-ink);
}

.btn-primary-small {
    padding: 0.65em 1.1em;
    font-size: 0.95rem;
    background-color: var(--color-petrol);
    border-color: var(--color-petrol);
    color: var(--color-white);
}