/* ==========================================================================
   Yumei Lumina — Responsive Styles
   ========================================================================== */

@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__content {
    max-width: 100%;
    margin: 0 auto;
  }

  .hero__actions { justify-content: center; }

  .hero__visual {
    max-width: 560px;
    margin: 0 auto;
  }

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

@media (max-width: 768px) {
  :root { --header-height: 64px; }

  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(5, 5, 5, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 1.5rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    border-top: 1px solid var(--border-subtle);
  }

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

  .site-nav__link {
    padding: 1rem;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--border-subtle);
  }

  .site-nav__link--active::after { display: none; }

  .nav-dropdown { width: 100%; }

  .nav-dropdown__toggle {
    width: 100%;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 0.95rem;
  }

  .nav-dropdown__menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0;
    display: none;
    min-width: 100%;
  }

  .nav-dropdown.is-open .nav-dropdown__menu { display: block; }

  .nav-dropdown__item {
    padding: 0.85rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .section { padding: 3.5rem 0; }

  .hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + 2rem);
    padding-bottom: 3rem;
  }

  .hero__title { font-size: 1.85rem; }
  .hero__tagline { font-size: 1.05rem; }
  .hero__description { font-size: 0.95rem; }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn { width: 100%; }

  .hero__beam,
  .hero__circuit { display: none; }

  .product-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .overview-stats { grid-template-columns: 1fr; }
  .site-footer__grid { grid-template-columns: 1fr; gap: 2rem; }

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

  .cta-section { padding: 3.5rem 1.5rem; }
  .page-main { padding-top: calc(var(--header-height) + 2rem); }

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

  .nav-submenu__label {
    cursor: pointer;
  }

  .nav-submenu__flyout {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    box-shadow: none;
    border: none;
    border-left: 2px solid rgba(214, 0, 0, 0.35);
    margin: 0.25rem 0 0.5rem 0.75rem;
    padding: 0.25rem 0;
    display: none;
    background: transparent;
  }

  .nav-submenu.is-open > .nav-submenu__flyout {
    display: block;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }

  .site-logo {
    font-size: 0.85rem;
    letter-spacing: 0.08em;
  }

  .site-logo__mark {
    width: 32px;
    height: 32px;
  }

  .section__title { font-size: 1.5rem; }
  .brand-statement__title { font-size: 1.35rem; }
  .product-card__body { padding: 1.25rem; }
}