/**
 * Shared site header + #main-nav — single source of truth (templates/index.html).
 * Pages should define :root tokens: --light-gray (or --dark-gray), --text-light, --light-purple.
 */
header,
.site-header {
  background-color: var(--light-gray, var(--dark-gray, #020202));
  padding: 1rem 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/*
 * Bootstrap 5 applies `nav { display: flex; flex-wrap: wrap; … }` to every <nav>.
 * Lab Metrics pages load Bootstrap before this file; without a display here, that rule
 * wins and shifts logo/link alignment vs the rest of the site (index, about, etc.).
 */
#main-nav {
  display: block;
  margin-bottom: 0;
  padding-left: 0;
  list-style: none;
}

header .logo,
.site-header .logo {
  display: flex;
  align-items: center;
  gap: 15px;
}

header .logo a,
.site-header .logo a {
  display: flex;
  align-items: center;
  line-height: 0;
  text-decoration: none;
}

header .navbar-logo,
.site-header .navbar-logo {
  display: block;
  height: 64px;
  width: auto;
  object-fit: contain;
}

@media (max-width: 768px) {
  header .navbar-logo,
  .site-header .navbar-logo {
    height: 52px;
  }
}

#main-nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

#main-nav a {
  color: var(--text-light, #f8f9fa);
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.5px;
  font-family: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  transition: color 0.2s;
}

#main-nav a:hover {
  color: var(--light-purple, #6c5cff);
}

#main-nav a.active {
  color: var(--light-purple, #6c5cff);
}

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light, #f8f9fa);
  padding-right: 15px;
}

.mobile-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

@media (max-width: 768px) {
  header,
  .site-header {
    padding: 0.75rem 0;
  }

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

  .mobile-toggle {
    display: block;
  }

  #main-nav {
    display: none;
    width: 100%;
    padding-top: 1rem;
  }

  #main-nav.active {
    display: block;
  }

  #main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  #main-nav ul li {
    width: 100%;
    text-align: center;
  }

  #main-nav ul li a {
    display: block;
    padding: 0.5rem;
  }
}