/* ==========================================================================
   IRIS OHYAMA - Responsive Styles
   Media Queries for Desktop / Tablet / Mobile
   ========================================================================== */

/* Tablet (768px - 1024px)
   ========================================================================== */
@media screen and (max-width: 1024px) {
  :root {
    --header-height: 70px;
  }

  .main-content {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  /* Page Layout: sidebar becomes tabs */
  .page-layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .sidebar-nav {
    position: static;
    border-radius: var(--radius-md);
  }

  .sidebar-nav__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
  }

  .sidebar-nav__item {
    border-bottom: none;
  }

  .sidebar-nav__link {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    font-size: var(--font-size-xs);
  }

  .sidebar-nav__link--active {
    border-left: none;
    border-color: var(--color-primary);
    background-color: rgba(230, 0, 18, 0.05);
  }

  /* Footer */
  .footer__inner {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }

  /* Product Grid */
  .product-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-md);
  }

  /* Navigation */
  .nav__link {
    padding: 0 var(--spacing-sm);
    font-size: var(--font-size-xs);
  }
}

/* Mobile (< 768px)
   ========================================================================== */
@media screen and (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  /* Typography */
  h1 {
    font-size: var(--font-size-2xl);
  }
  h2 {
    font-size: var(--font-size-xl);
  }
  h3 {
    font-size: var(--font-size-lg);
  }

  /* Header */
  .header {
    padding: 0 var(--spacing-md);
  }

  .header__logo-img {
    height: 36px;
  }

  .header__logo-sub {
    display: none;
  }

  /* Hamburger Menu */
  .hamburger {
    display: flex;
  }

  /* Mobile Navigation */
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: var(--spacing-md);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    z-index: 999;
  }

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

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__item {
    height: auto;
    flex-direction: column;
    align-items: stretch;
    border-bottom: 1px solid var(--color-border-light);
  }

  .nav__link {
    padding: var(--spacing-md);
    height: auto;
    font-size: var(--font-size-base);
  }

  .nav__link::after {
    display: none;
  }

  /* Mobile Submenu */
  .nav__submenu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background-color: var(--color-bg-alt);
    border-radius: 0;
    display: none;
    padding: var(--spacing-xs) 0;
    border: none;
    min-width: 0;
  }

  .nav__submenu::before {
    display: none;
  }

  .nav__item--has-submenu.nav__item--expanded .nav__submenu {
    display: block;
  }

  .nav__item--has-submenu > .nav__link::before {
    margin-left: auto;
    border-top: 5px solid currentColor;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    transition: transform var(--transition-fast);
  }

  .nav__item--has-submenu.nav__item--expanded > .nav__link::before {
    transform: rotate(180deg);
  }

  /* Language Switcher in mobile */
  .language-switcher {
    margin-top: var(--spacing-md);
    justify-content: center;
  }

  /* Main Content */
  .main-content {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  /* Footer */
  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  /* Product Grid */
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .product-grid__image {
    height: 160px;
  }

  .product-grid__info {
    padding: var(--spacing-sm);
  }

  .product-grid__name {
    font-size: var(--font-size-sm);
  }

  /* Carousel */
  .carousel__btn {
    width: 36px;
    height: 36px;
    font-size: var(--font-size-base);
  }

  .carousel__btn--prev {
    left: var(--spacing-sm);
  }

  .carousel__btn--next {
    right: var(--spacing-sm);
  }

  /* Form */
  .form {
    max-width: 100%;
  }

  /* Tabs */
  .tabs__nav {
    gap: 0;
  }

  .tabs__tab {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
  }

  /* Section */
  .section {
    padding-top: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
  }

  .section__title {
    font-size: var(--font-size-xl);
  }

  /* FAB Message */
  .fab-message {
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    font-size: 20px;
  }

  .fab-message__tooltip {
    display: none;
  }

  /* FAB WeCom */
  .fab-wecom {
    bottom: 80px;
    right: 20px;
    width: 48px;
    height: 48px;
    font-size: 20px;
  }

  .fab-wecom__tooltip {
    display: none;
  }
}

/* Small Mobile (< 480px)
   ========================================================================== */
@media screen and (max-width: 480px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .language-switcher__btn {
    padding: var(--spacing-xs) 6px;
    font-size: 11px;
  }
}