/* ===== SITE HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--navy);
  display: flex;
  align-items: center;
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.site-header__inner {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--s3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--s1);
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.site-logo__icon {
  width: 36px;
  height: 36px;
  background: var(--orange);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  font-weight: 900;
  color: #fff;
}

.site-logo:hover {
  color: #CBD5E1;
}

/* Navegació */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--s3);
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: var(--s1);
}

.site-nav__link {
  color: #CBD5E1;
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: var(--r-md);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition);
}

.site-nav__link:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
}

/* Botó hamburguesa */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: #fff;
}

.menu-toggle__line {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: all var(--transition);
}

/* Menú mòbil */
@media (max-width: 768px) {
  .menu-toggle { display: flex; }

  .site-nav__links {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--navy-dark);
    flex-direction: column;
    padding: var(--s2);
    gap: 0.25rem;
    border-top: 1px solid rgba(255,255,255,0.1);
  }

  .site-nav__links.open {
    display: flex;
  }

  .site-nav__link {
    padding: 0.75rem 1rem;
    border-radius: var(--r-md);
    font-size: var(--text-md);
  }

  .site-nav .btn {
    display: none;
  }
}

/* ===== SITE FOOTER ===== */
.site-footer {
  background: var(--navy-dark);
  color: #CBD5E1;
  padding-block: var(--s8);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--s6);
  margin-bottom: var(--s6);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--s2);
}

.site-footer__brand p {
  font-size: var(--text-sm);
  color: #94A3B8;
  max-width: 36ch;
}

.site-footer__heading {
  font-size: var(--text-sm);
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--s2);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--s1);
}

.site-footer__links a {
  color: #94A3B8;
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition);
}

.site-footer__links a:hover {
  color: #fff;
}

.site-footer__bottom {
  padding-top: var(--s4);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s2);
  flex-wrap: wrap;
  font-size: var(--text-sm);
  color: #64748B;
}

@media (max-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--s4);
  }
}

/* ===== BACK TO TOP ===== */
#back-top {
  position: fixed;
  bottom: var(--s4);
  right: var(--s4);
  width: 44px;
  height: 44px;
  background: var(--navy);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(12px);
  transition: all var(--transition);
  pointer-events: none;
  cursor: pointer;
  border: none;
  text-decoration: none;
}

#back-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#back-top:hover {
  background: var(--navy-dark);
}