/* ============================================
   東光化学 WordPress Theme - Responsive
   Mobile-first responsive breakpoints
   ============================================ */

/* ── Tablet (max-width: 1024px) ── */
@media (max-width: 1024px) {
  :root {
    --text-6xl: 2.75rem;
    --text-5xl: 2.25rem;
    --text-4xl: 2rem;
  }

  .header__nav {
    display: none;
  }

  .header__menu-toggle {
    display: flex;
  }

  .hero {
    height: auto;
    min-height: 500px;
    max-height: none;
  }

  .hero__slide-inner {
    flex-direction: column;
    text-align: center;
    padding: var(--space-12) var(--space-6);
    gap: var(--space-8);
  }

  .hero__slide-content {
    max-width: 100%;
  }

  .hero__slide-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__slide-actions {
    justify-content: center;
  }

  .hero__slide-image {
    max-width: 400px;
  }

  .hero__arrow {
    display: none;
  }

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

  .promo-card {
    min-height: 280px;
  }

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

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

  .campaign-grid {
    grid-template-columns: 1fr;
    max-width: 600px;
    margin: 0 auto;
  }

  .news-section__inner {
    grid-template-columns: 1fr;
  }

  .news-section__header {
    position: static;
  }

  .footer__top {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .footer__brand {
    grid-column: 1 / -1;
  }

  .tabs {
    overflow-x: auto;
    justify-content: flex-start;
    width: 100%;
    -webkit-overflow-scrolling: touch;
  }
}

/* ── Mobile (max-width: 768px) ── */
@media (max-width: 768px) {
  :root {
    --text-6xl: 2.25rem;
    --text-5xl: 1.875rem;
    --text-4xl: 1.5rem;
    --text-3xl: 1.25rem;
  }

  .container {
    padding: 0 var(--space-4);
  }

  .hero {
    min-height: 450px;
  }

  .hero__slide-inner {
    padding: var(--space-8) var(--space-4);
  }

  .hero__slide-label {
    font-size: 10px;
  }

  .hero__slide-image {
    max-width: 280px;
  }

  .hero__slide-image img {
    max-height: 250px;
  }

  .promo-card {
    flex-direction: column;
    min-height: auto;
  }

  .promo-card__content {
    padding: var(--space-6);
  }

  .promo-card__title {
    font-size: var(--text-2xl);
  }

  .promo-card__image {
    padding: var(--space-4);
  }

  .promo-card__image img {
    max-height: 200px;
  }

  .product-showcase__grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }

  .features-row__grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .section-title__heading {
    font-size: var(--text-2xl);
  }

  .cta-banner__heading {
    font-size: var(--text-2xl);
  }

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

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .news-card {
    flex-direction: column;
    gap: var(--space-2);
  }

  .news-card__date {
    min-width: auto;
  }

  .btn--lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
  }

  .tabs {
    border-radius: var(--radius-lg);
  }

  .tab-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
  }
}

/* ── Small Mobile (max-width: 480px) ── */
@media (max-width: 480px) {
  .hero__slide-heading {
    font-size: 1.75rem;
  }

  .hero__slide-desc {
    font-size: var(--text-sm);
  }

  .hero__slide-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero__slide-actions .btn {
    width: 100%;
  }

  .header__contact-btn {
    display: none;
  }

  .promo-card__content {
    padding: var(--space-5);
  }

  .section-title__label::before,
  .section-title__label::after {
    display: none;
  }
}

/* ── Mobile Navigation Overlay ── */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 320px;
  max-width: 85vw;
  height: 100%;
  background: var(--white);
  padding: var(--space-8) var(--space-6);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
  overflow-y: auto;
}

.mobile-nav.open .mobile-nav__panel {
  transform: translateX(0);
}

.mobile-nav__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: var(--text-2xl);
  color: var(--text-dark);
}

.mobile-nav__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-12);
}

.mobile-nav__link {
  padding: var(--space-4) var(--space-4);
  font-size: var(--text-lg);
  font-weight: var(--fw-medium);
  color: var(--text-dark);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  background: var(--bg-light);
  color: var(--accent);
}

.mobile-nav__contact {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-light);
}

.mobile-nav__contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-muted);
}