/* ===========================
   BUTTONS
   =========================== */
.btn {
    display: inline-block;
    padding: 15px 40px;
    border: none;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-slow);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.15), transparent);
    transform: translateX(-100%);
    transition: transform 0.4s ease;
}

.btn:hover::before {
    transform: translateX(100%);
}

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

.btn-primary:hover {
    background: var(--color-primary-light);
    box-shadow: 0 6px 25px rgba(92, 64, 51, 0.25);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 6px 25px rgba(92, 64, 51, 0.3);
    transform: translateY(-2px);
}

.btn-outline-light {
    background: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

.btn-outline-light:hover {
    background: var(--color-white);
    color: var(--color-primary);
    box-shadow: 0 6px 25px rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.btn-text {
    background: transparent;
    color: var(--color-primary);
    padding: 10px 0;
    box-shadow: none;
    position: relative;
}

.btn-text::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--color-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.btn-text:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.btn-text:hover {
    transform: translateX(5px);
}

/* --- Responsive (fusionat de _responsive-480 — F3.4, 2026-06-23).
   2026-07-10 (BLOC A responsive): font-size 0.8rem (12.8px) -> 0.875rem (14px), terra
   tipografic de mobil. El CTA del hero manté el seu override propi (0.9rem @600,
   sprint64-proporcions.css) i els botons de testimonis el seu (0.92rem). */
@media (max-width: 480px) {
    .btn {
        padding: 12px 30px;
        font-size: 0.875rem;
    }
}