/* ============================================================
   SELLOS MECÁNICOS LERMA — responsive.css
   Mobile-first breakpoints: 640px | 1024px | 1280px
   ============================================================ */

/* ── BASE (mobile < 640px) ───────────────────────────────── */

.nav__links { display: none; }
.nav__hamburger { display: flex; }

.nav__mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--color-base-dark);
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  z-index: 99;
  border-top: 2px solid var(--color-accent);
  padding: 0.5rem 0;
}

.nav__mobile-menu.open { display: flex; }

.nav__mobile-menu a {
  padding: 0.85rem var(--container-pad);
  color: #cccccc;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition), color var(--transition);
}

.nav__mobile-menu a:hover,
.nav__mobile-menu a[aria-current="page"] {
  background: rgba(248,210,23,0.08);
  color: var(--color-accent);
}

.nav__mobile-menu .nav__cta {
  margin: 0.75rem var(--container-pad);
  text-align: center;
  border-radius: var(--radius-sm);
  border-bottom: none;
  background: var(--color-accent);
  color: var(--color-base-dark) !important;
  font-weight: 700 !important;
}

.hero { min-height: calc(80vh - var(--nav-height)); }
.hero__actions { flex-direction: column; align-items: flex-start; }
.hero__actions .btn { width: 100%; max-width: 320px; }

.grid--2,
.grid--3,
.grid--4 { grid-template-columns: 1fr; }

.filter-bar { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 0.5rem; -webkit-overflow-scrolling: touch; }

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

.whatsapp-float { width: 52px; height: 52px; bottom: 1.25rem; right: 1.25rem; }
.whatsapp-float svg { width: 27px; height: 27px; }
.whatsapp-float::before { display: none; }

.map-embed { height: 260px; }

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

.brand-tabs-nav { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.brand-tab-btn  { white-space: nowrap; padding: 0.75rem 1.25rem; font-size: 0.9rem; }

.brand-section { grid-template-columns: 1fr; }

.article-hero-img { aspect-ratio: 16/9; }

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

.stat-card__number { font-size: 2.2rem; }

/* ── TABLET (≥ 640px) ────────────────────────────────────── */
@media (min-width: 640px) {

  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }

  .filter-bar { flex-wrap: wrap; overflow-x: visible; }

  .footer-grid { grid-template-columns: repeat(2, 1fr); }

  .blog-grid { grid-template-columns: repeat(2, 1fr); }

  .hero__actions { flex-direction: row; }
  .hero__actions .btn { width: auto; }

  .map-embed { height: 320px; }

  .brand-section { grid-template-columns: 1fr 1fr; }
}

/* ── DESKTOP (≥ 1024px) ──────────────────────────────────── */
@media (min-width: 1024px) {

  /* Nav: switch to horizontal */
  .nav__links    { display: flex; }
  .nav__hamburger { display: none; }
  .nav__mobile-menu { display: none !important; }

  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }

  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }

  .contact-grid { grid-template-columns: 3fr 2fr; }

  .blog-grid { grid-template-columns: repeat(3, 1fr); }

  .map-embed { height: 400px; }

  .brand-section {
    grid-template-columns: 1fr 2fr;
    align-items: start;
  }

  .whatsapp-float::before { display: block; }

  .hero { min-height: calc(85vh - var(--nav-height)); }

  .article-hero-img { aspect-ratio: 16/6; }
}

/* ── WIDE (≥ 1280px) ─────────────────────────────────────── */
@media (min-width: 1280px) {

  .grid--4 { grid-template-columns: repeat(4, 1fr); }

  .section { padding-block: calc(var(--space-lg) * 1.25); }
}

/* ── PRINT ───────────────────────────────────────────────── */
@media print {
  .site-header,
  .whatsapp-float,
  .nav__hamburger,
  .cta-banner,
  .site-footer { display: none; }

  body { color: #000; background: #fff; }
  a    { text-decoration: underline; }

  .container { max-width: 100%; padding: 0; }
}