/* ==========================================================================
   IACBT — Primary Navigation
   Two-tier on desktop/laptop (>=1200px): a slim brand+CTA row, then a
   full-width secondary row that holds the section links -- this gives
   every link room to breathe instead of competing with the logo and
   CTA button for space in one row.
   Below 1200px (tablets -- iPad mini/Air/Pro portrait -- and phones) the
   secondary row's links become a fixed touch-friendly drawer instead.
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

/* ---- Utility strip (partner logos / journal link) ---- */
/* .utility-bar {
  background: var(--color-primary-dark);
  overflow: hidden;
  transition: max-height var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
  max-height: 40px;
}

.is-scrolled .utility-bar {
  max-height: 0;
  opacity: 0;
} */

/* .utility-bar {
  background: var(--color-primary-dark);
  overflow: hidden;
  transform-origin: top;
  transition:
    transform var(--dur-base) var(--ease-out),
    opacity var(--dur-base) var(--ease-out);
}

.is-scrolled .utility-bar {
  transform: scaleY(0);
  opacity: 0;
  pointer-events: none;
} */

.utility-bar {
    background: var(--color-primary-dark);
    height: 40px;
    overflow: hidden;
    transition:
        margin-top .3s ease,
        opacity .3s ease;
}

.is-scrolled .utility-bar {
    margin-top: -40px;
    opacity: 0;
}

.utility-bar__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-3xs) var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-lg);
}

.utility-bar__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3xs);
  font-size: var(--fs-small);
  color: rgba(255, 255, 255, 0.85);
  padding-block: var(--space-2xs);
  transition: color var(--dur-fast) var(--ease-out);
}

.utility-bar__link:hover {
  color: #fff;
}

.utility-bar__logos {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.utility-bar__logos img {
  height: 22px;
  width: auto;
  border-radius: 4px;
  background: #fff;
  padding: 2px;
}

/* ---- Row 1: brand + CTA + toggle ---- */
.navbar {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  height: var(--nav-height);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-md);
  transition: height var(--dur-base) var(--ease-out);
}

/* .is-scrolled .navbar {
  height: var(--nav-height-scrolled);
} */

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-shrink: 0;
  min-width: 0;
}

.navbar__brand img {
  height: 68px;
  width: auto;
  max-width: 320px;
  object-fit: contain;
  flex-shrink: 0;
  transition: height var(--dur-base) var(--ease-out);
}

/* .is-scrolled .navbar__brand img {
  height: 56px;
} */

.navbar__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  white-space: nowrap;
}

.navbar__brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-primary);
}

.navbar__brand-sub {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

/* ---- Row 1 center: quick contact (fills the space between brand and CTA) ---- */
.navbar__contact {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

.navbar__contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  white-space: nowrap;
}

.navbar__contact-item i {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.navbar__contact-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.navbar__contact-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
}

.navbar__contact-value {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text-dark);
  transition: color var(--dur-fast) var(--ease-out);
}

.navbar__contact-item a:hover .navbar__contact-value {
  color: var(--color-primary);
}

.navbar__right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* ---- Row 2: the full-width secondary link bar (desktop/laptop) ---- */
.nav-secondary {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.nav-secondary__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  justify-content: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex-wrap: nowrap;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0.9rem 0.7rem;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-dark);
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link[aria-expanded="true"] {
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.14);
}

.nav-link .chevron {
  width: 9px;
  height: 9px;
  flex-shrink: 0;
  transition: transform var(--dur-fast) var(--ease-out);
}

.nav-link[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.nav-item.current>.nav-link {
  color: var(--color-primary);
}

.nav-item.current>.nav-link::after {
  content: '';
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 5px;
  height: 2px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
}

/* ---- Dropdown ---- */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 250px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out),
    visibility var(--dur-base);
  z-index: var(--z-dropdown);
}

.nav-item.is-open .nav-dropdown,
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown__link {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text-body);
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), padding-left var(--dur-fast) var(--ease-out);
}

.nav-dropdown__link i {
  color: var(--color-secondary);
  width: 16px;
  text-align: center;
  font-size: 0.85em;
}

.nav-dropdown__link:hover {
  background: var(--color-bg);
  color: var(--color-primary);
  padding-left: var(--space-md);
}

/* ---- Hamburger ---- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  position: relative;
  z-index: calc(var(--z-nav) + 20);
}

.nav-toggle:hover {
  background: var(--color-bg);
}

.nav-toggle__bar {
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   Tablet & below (iPad mini / Air / Pro portrait, and phones): <=1199px
   The secondary row visually disappears -- its only job at this size is
   to host the fixed drawer, which is pulled out of flow anyway.
   ========================================================================== */
@media (max-width: 575px) {
  .navbar__cta-persistent {
    display: none;
  }

  .navbar__brand img {
    height: 54px;
    max-width: 240px;
  }
}

@media (max-width: 1199px) {
  .navbar {
    grid-template-columns: auto 1fr;
  }

  .navbar__brand img {
    height: 56px;
    max-width: 240px;
  }

  .navbar__contact {
    display: none;
  }

  .navbar__right {
    justify-self: end;
  }

  .utility-bar__link span {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-secondary {
    border-top: none;
    background: transparent;
  }

  .nav-secondary__inner {
    padding: 0;
  }

  .nav-menu {
    position: fixed;
    inset: 0 0 0 auto;
    top: 0;
    height: 100vh;
    z-index: calc(var(--z-nav) + 10);
    width: min(340px, 86vw);
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: calc(var(--nav-height-scrolled) + var(--space-md)) var(--space-md) var(--space-md);
    transform: translateX(100%);
    transition: transform var(--dur-slow) var(--ease-in-out);
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-xs);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
    font-size: 0.9375rem;
  }

  .nav-link .chevron {
    width: 10px;
    height: 10px;
  }

  .nav-item.current>.nav-link::after {
    display: none;
  }

  .nav-dropdown {
    position: static;
    box-shadow: none;
    border: none;
    border-radius: 0;
    background: var(--color-bg);
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
    padding: var(--space-2xs) 0 var(--space-2xs) var(--space-md);
    transition: none;
  }

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

  .navbar__cta {
    margin-top: var(--space-md);
    width: 100%;
  }

  .navbar__cta .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ---- Comfortable spacing once there's real laptop/desktop width ---- */
@media (min-width: 1200px) and (max-width: 1339px) {
  .nav-link {
    padding-inline: 0.55rem;
    font-size: 0.8125rem;
  }

  .nav-menu {
    gap: 0;
  }
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-out), visibility var(--dur-base);
  z-index: calc(var(--z-nav) - 1);
}

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

@media (max-width: 380px) {
  .navbar__brand {
    gap: 0.45rem;
  }

  .navbar__brand img {
    height: 46px;
    max-width: 180px;
  }

  .navbar__brand-name {
    font-size: 1.15rem;
  }

  .navbar__brand-sub {
    font-size: 0.62rem;
    line-height: 1.15;
  }
}

@media (max-width: 340px) {
  .navbar__brand-name {
    font-size: 1rem;
  }

  .navbar__brand-sub {
    font-size: 0.56rem;
  }

  .navbar__brand img {
    height: 42px;
    max-width: 165px;
  }
}