/************************************************************/
/*  NABIRA SITE-PACKAGE - RESPONSIVE & MOBILE STYLESHEET    */
/************************************************************/

/* =========================================================
   TABLET & MOBILE BREAKPOINT (< 992px)
   ========================================================= */
@media screen and (max-width: 991px) {

  /* Layout & Container */
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .main-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .content-card {
    padding: 1.5rem 1.25rem;
    border-radius: var(--radius-md);
  }

  .site-main {
    padding-top: 1.25rem;
    padding-bottom: 2.5rem;
  }

  /* Header Top Utility Bar */
  .header-top-inner {
    justify-content: center;
    padding-top: 0.35rem;
    padding-bottom: 0.35rem;
  }

  .nav-utility-list {
    gap: 1rem;
    font-size: 0.8125rem;
  }

  /* Main Header & Branding */
  .header-main-inner {
    position: relative;
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .brand-logo {
    width: 160px;
  }

  .brand-tagline {
    padding-left: 0.5rem;
  }

  .tagline-title {
    font-size: 0.95rem;
  }

  .tagline-subtitle {
    font-size: 0.75rem;
  }

  /* Mobile Navigation Toggle Button */
  .nav-toggle {
    display: inline-flex;
    z-index: 101;
  }

  /* Mobile Accordion Navigation Drawer */
  .nav-main {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    background-color: var(--color-surface);
    border-bottom: 2px solid var(--color-primary);
    box-shadow: var(--shadow-lg);
    padding: 1rem;
    z-index: 999;
  }

  .nav-main.is-open {
    display: block;
    animation: navSlideDown 0.2s ease-out;
  }

  @keyframes navSlideDown {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    width: 100%;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }

  .nav-link {
    display: block;
    flex: 1;
    padding: 0.75rem 0.5rem;
    font-size: 1.05rem;
    border-radius: var(--radius-sm);
  }

  /* Submenu Chevron Button */
  .nav-sub-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
  }

  .nav-sub-toggle:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
  }

  .nav-sub-toggle .chevron {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--transition-fast);
    margin-bottom: 2px;
  }

  .nav-sub-toggle[aria-expanded="true"] .chevron {
    transform: rotate(-135deg);
    margin-bottom: -2px;
  }

  /* Submenu Accordion Behavior */
  .nav-sub-list {
    display: none;
    position: static;
    width: 100%;
    min-width: 0;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--color-primary-light);
    border-radius: 0;
    padding: 0.25rem 0 0.5rem 1rem;
    background-color: transparent;
  }

  .nav-sub-list.is-open {
    display: block;
  }

  .nav-item:hover > .nav-sub-list,
  .nav-item:focus-within > .nav-sub-list {
    display: none; /* Disable hover opening on touch devices in favor of tap toggle */
  }

  .nav-item > .nav-sub-list.is-open {
    display: block;
  }

  .nav-sub-link {
    padding: 0.6rem 0.5rem;
    font-size: 0.95rem;
  }

  /* Level 3 Sub-sub List on Mobile */
  .nav-sub-sub-list {
    display: none;
    position: static;
    width: 100%;
    min-width: 0;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--color-primary-light);
    padding: 0.25rem 0 0.5rem 1rem;
    background-color: transparent;
  }

  .nav-sub-sub-list.is-open {
    display: block;
  }

  .nav-sub-item:hover > .nav-sub-sub-list,
  .nav-sub-item:focus-within > .nav-sub-sub-list {
    display: none;
  }

  .nav-sub-item > .nav-sub-sub-list.is-open {
    display: block;
  }

  /* Footer on Tablet/Mobile */
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .footer-content {
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* =========================================================
   PHONE BREAKPOINT (< 640px)
   ========================================================= */
@media screen and (max-width: 639px) {

  /* Brand adjustments */
  .brand-logo {
    width: 145px;
  }

  .brand-tagline {
    display: none; /* Hide subtitle only on tiny mobile to keep header clean */
  }

  /* Multi-column units stack vertically */
  .content-grid-two {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  /* Headings on mobile */
  h1,
  .main-content h1,
  .content-card h1,
  .column1 h1,
  .column2 h1 {
    font-size: 1.5rem;
  }

  h2,
  .main-content h2,
  .content-card h2 {
    font-size: 1.25rem;
  }

  /* In-text media unfloated on small screens */
  .ce-textpic.ce-right .ce-gallery,
  .ce-intext.ce-right .ce-gallery,
  .ce-textpic.ce-left .ce-gallery,
  .ce-intext.ce-left .ce-gallery {
    float: none;
    margin: 0 auto 1.25rem auto;
    text-align: center;
  }

  .ce-gallery figure {
    width: 100%;
  }

  .ce-gallery img {
    margin: 0 auto;
  }

  /* Responsive Tables */
  .main-content table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Breadcrumbs wrapping */
  .breadcrumb-list {
    font-size: 0.8125rem;
  }
}