/* ============================================================
   HEADER.CSS — Sticky Navigation
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-header);
  transition: background-color var(--transition-base),
    box-shadow var(--transition-base),
    backdrop-filter var(--transition-base);
}

/* Transparent state (on hero) */
.site-header--transparent {
  background-color: transparent;
}

/* Solid state (after scroll) */
.site-header--solid {
  background-color: var(--color-deep);
  box-shadow: 0 1px 0 rgba(253, 252, 248, 0.08);
  backdrop-filter: blur(12px);
}

/* Non-home pages always solid */
.site-header--always-solid {
  background-color: var(--color-deep);
  box-shadow: 0 1px 0 rgba(253, 252, 248, 0.08);
}

/* ——— Inner layout — 3-column grid ——— */
.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 100%;
  padding-inline: var(--container-px);
  max-width: var(--container-max);
  margin-inline: auto;
  gap: 1rem;
}

/* ——— Logo Strip ——— */
.site-header__logos {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
}

.site-header__logo-img {
  width: auto;
  max-width: 250px;
  object-fit: contain;
  object-position: center;
  vertical-align: middle;
}

.site-header__logo-img[src*="uwo"] {
  height: 25px;
  margin-right: 20px;
  /* Western logo is wide/tall, visually shrink it slightly */
}

.site-header__logo-img[src*="waterloo"] {
  height: 56px;
  /* Waterloo logo is mostly padding/wide, visually scale it up */
}

.site-header__logo-sep {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: rgba(253, 252, 248, 0.4);
  user-select: none;
}

/* ——— Wordmark (centre column) ——— */
.site-header__wordmark {
  font-family: var(--font-heading);
  font-size: var(--text-small);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(253, 252, 248, 0.75);
  white-space: nowrap;
  pointer-events: none;
  text-align: center;
  /* No position:absolute — sits naturally in centre grid column */
}

/* ——— Navigation (right column) ——— */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.25rem;
}

.site-nav__link {
  font-family: var(--font-heading);
  font-size: var(--text-small);
  font-weight: 500;
  color: rgba(253, 252, 248, 0.75);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-white);
  background-color: var(--color-white-10);
}

.site-nav__cta {
  margin-left: 0.5rem;
  padding: 0.5rem 1.1rem;
  background-color: var(--color-forest);
  color: var(--color-white) !important;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-small);
  font-family: var(--font-heading);
  white-space: nowrap;
  transition: background-color var(--transition-base), transform var(--transition-fast);
}

.site-nav__cta:hover {
  background-color: #245c42;
  transform: translateY(-1px);
  color: var(--color-white);
  background-color: #245c42 !important;
}

.site-nav__cta--secondary {
  background-color: var(--color-sand) !important;
  color: var(--color-deep) !important;
  border: 1px solid var(--color-deep-10);
}

.site-nav__cta--secondary:hover {
  background-color: #e5d8c3 !important;
  color: var(--color-deep) !important;
}

/* ——— Hamburger (mobile) ——— */
.site-header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.site-header__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

.site-header__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

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

/* ——— Mobile Drawer ——— */
.site-nav__mobile {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-deep);
  border-top: 1px solid rgba(253, 252, 248, 0.08);
  padding: 1.5rem var(--container-px) 2rem;
  z-index: calc(var(--z-header) - 1);
  animation: fadeIn 0.2s ease;
}

.site-nav__mobile.is-open {
  display: block;
}

.site-nav__mobile-link {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 500;
  color: rgba(253, 252, 248, 0.8);
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(253, 252, 248, 0.06);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-nav__mobile-link:hover,
.site-nav__mobile-link[aria-current="page"] {
  color: var(--color-sage);
}

.site-nav__mobile-cta {
  display: inline-block;
  margin-top: 1.25rem;
  background-color: var(--color-forest);
  color: var(--color-white);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition-base);
}

.site-nav__mobile-cta:hover {
  background-color: #245c42;
}

.site-nav__mobile-cta--secondary {
  background-color: var(--color-sand) !important;
  color: var(--color-deep) !important;
  margin-left: 0.5rem;
}

.site-nav__mobile-cta--secondary:hover {
  background-color: #e5d8c3 !important;
}

/* ——— Responsive ——— */
@media (max-width: 1150px) {
  .site-header__inner {
    grid-template-columns: 1fr auto;
    /* logos | hamburger */
  }

  .site-nav {
    display: none;
  }

  .site-header__hamburger {
    display: flex;
  }

  .site-header__wordmark {
    display: none;
  }
}

@media (max-width: 480px) {
  .site-header__logo-img[src*="uwo"] {
    height: 20px;
    margin-right: 10px;
  }

  .site-header__logo-img[src*="waterloo"] {
    height: 42px;
  }
}