/*
 * Shared site header.
 * Self-contained (literal colors, no external custom properties) and
 * scoped under .site-header so it renders identically on pages that also
 * load ecosystem.css / student-refresh.css / blog.css.
 * Mirrors the header rules in css/styles.css; keep the two in sync.
 */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  isolation: isolate;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 24px;
  padding: 16px clamp(20px, 5vw, 72px);
  line-height: normal;
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid #e2e8ee;
  box-shadow: 0 1px 0 rgba(16, 24, 32, 0.03);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.site-header .brand {
  grid-column: 1;
  grid-row: 1;
  justify-self: start;
  position: static;
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #2f7ab8;
  font-weight: 850;
  font-size: clamp(18px, 2vw, 26px);
  letter-spacing: 0.02em;
  line-height: 1;
  text-decoration: none;
}

.site-header .brand-logo-full {
  display: block;
  width: 132px;
  height: 34px;
  object-fit: cover;
  object-position: center;
}

.site-header .nav-links {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 26px;
  margin: 0;
  padding: 0;
  color: #57646f;
  font-size: 14px;
  font-weight: 700;
}

.site-header .nav-links a {
  white-space: nowrap;
  color: inherit;
  text-decoration: none;
}

.site-header .nav-links a:hover,
.site-header .nav-links a[aria-current="page"],
.site-header .mobile-nav-links a:hover,
.site-header .mobile-nav-links a[aria-current="page"] {
  color: #2f7ab8;
}

.site-header .mobile-menu {
  display: none;
  position: static;
  margin: 0;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr 44px;
    gap: 12px;
    padding: 14px 20px;
  }

  .site-header .nav-links {
    display: none;
  }

  .site-header .mobile-menu {
    grid-column: 2;
    justify-self: end;
    display: block;
    z-index: 1001;
  }

  .site-header .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    flex-direction: column;
    gap: 6px;
    border: 0;
    border-radius: 0;
    background: transparent;
    cursor: pointer;
    list-style: none;
  }

  .site-header .menu-toggle::-webkit-details-marker {
    display: none;
  }

  .site-header .menu-toggle span {
    width: 28px;
    height: 3px;
    border-radius: 999px;
    background: #71b2e1;
  }

  .site-header .mobile-nav-links {
    position: absolute;
    top: calc(100% + 1px);
    left: 20px;
    right: 20px;
    width: auto;
    z-index: 1002;
    display: grid;
    gap: 4px !important;
    margin: 0 !important;
    padding: 12px;
    border: 1px solid #e2e8ee;
    border-radius: 0 0 14px 14px;
    background: #ffffff;
    box-shadow: 0 22px 44px rgba(16, 24, 32, 0.12);
    pointer-events: auto;
  }

  .site-header .mobile-nav-links a {
    padding: 12px 14px;
    border-radius: 10px;
    color: #16202b;
    font-size: 14px;
    font-weight: 800;
    text-decoration: none;
  }

  .site-header .mobile-nav-links a:hover,
  .site-header .mobile-nav-links a[aria-current="page"] {
    background: rgba(113, 178, 225, 0.12);
  }
}