/* Site-wide navbar, markup in _includes/masthead.html.
   Sizes are in px because the theme changes the root font size by screen width. */

html {
  scroll-padding-top: 76px;
}

/* Keep the theme's sticky author sidebar clear of the navbar */
.sidebar.sticky {
  top: 84px;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.62);
  border-bottom: 1px solid rgba(20, 22, 43, 0.1);
  -webkit-backdrop-filter: blur(20px) saturate(170%);
  backdrop-filter: blur(20px) saturate(170%);
  color: #14162b;
  font-family: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* Without backdrop blur, a more opaque bar keeps the text readable */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-nav {
    background: rgba(255, 255, 255, 0.92);
  }
}

.site-nav__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
  max-width: 1360px;
  min-height: 64px;
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}

.site-nav a,
.site-nav a:visited,
.site-nav a:hover {
  color: #14162b;
  text-decoration: none;
}

.site-nav__identity {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.site-nav__duke {
  display: flex;
  align-items: center;
  flex: none;
  min-height: 44px;
}

.site-nav__duke img {
  display: block;
  width: auto;
  height: 40px;
}

.site-nav__divider {
  flex: none;
  width: 1px;
  height: 36px;
  background: rgba(20, 22, 43, 0.28);
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  min-height: 64px;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.025em;
  white-space: nowrap;
}

.site-nav__links {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__links li {
  margin: 0;
}

.site-nav__links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.15s ease;
}

.site-nav__links a:hover,
.site-nav__links a[aria-current="page"] {
  background: rgba(20, 22, 43, 0.08);
}

.site-nav a:focus-visible,
.site-nav__toggle:focus-visible {
  outline: 2px solid #14162b;
  outline-offset: 2px;
}

.site-nav__toggle {
  display: none;
}

/* Dropdown menu (Research) */
.site-nav__has-sub {
  position: relative;
}

.site-nav .site-nav__sub-toggle,
.site-nav .site-nav__sub-toggle.hidden {
  display: flex !important;
  visibility: visible !important;
  align-items: center;
  gap: 6px;
  width: auto;
  min-height: 44px;
  margin: 0;
  padding: 0 14px;
  background: transparent;
  border: 0;
  border-radius: 10px;
  box-shadow: none;
  color: #14162b;
  font: 600 15px "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.site-nav .site-nav__sub-toggle:hover,
.site-nav .site-nav__sub-toggle.is-active,
.site-nav__has-sub.is-open .site-nav__sub-toggle {
  background: rgba(20, 22, 43, 0.08);
}

.site-nav .site-nav__sub-toggle:focus-visible {
  outline: 2px solid #14162b;
  outline-offset: 2px;
}

.site-nav__sub {
  display: none;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 768px) {
  .site-nav__sub {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 60;
    width: 300px;
    padding: 6px;
    background: #ffffff;
    border: 1px solid rgba(20, 22, 43, 0.1);
    border-radius: 14px;
    box-shadow: 0 16px 40px rgba(40, 30, 80, 0.16);
  }

  /* Opens on hover, or on click for touch screens and keyboards */
  .site-nav__has-sub:hover .site-nav__sub,
  .site-nav__has-sub.is-open .site-nav__sub {
    display: block;
  }

  .site-nav__sub a {
    min-height: 44px;
    padding: 8px 12px;
    line-height: 1.35;
  }
}

/* Keep the Duke logo, lab name and menu button on one line on phones */
@media (max-width: 480px) {
  .site-nav__identity {
    gap: 9px;
  }

  .site-nav__duke img {
    height: 30px;
  }

  .site-nav__divider {
    height: 28px;
  }

  .site-nav__brand {
    font-size: 17px;
  }
}

@media (max-width: 767px) {
  /* Only collapse when the script is running, so the links stay reachable without it */
  .site-nav.has-js .site-nav__toggle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    margin: 0 -8px 0 0;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 10px;
    box-shadow: none;
    cursor: pointer;
  }

  /* The theme's greedy-navigation script adds .hidden to any button in #site-nav on inner pages.
     It needs that id to exist or it crashes, so override the class here. */
  .site-nav.has-js .site-nav__toggle.hidden {
    display: flex !important;
    visibility: visible !important;
  }

  .site-nav__bar {
    display: block;
    width: 22px;
    height: 2px;
    border-radius: 2px;
    background: #14162b;
  }

  .site-nav.is-open .site-nav__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .site-nav.is-open .site-nav__bar:nth-child(2) {
    opacity: 0;
  }

  .site-nav.is-open .site-nav__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav__collapse {
    display: block;
    flex: 1 0 100%;
  }

  .site-nav.has-js .site-nav__collapse {
    display: none;
  }

  .site-nav.has-js.is-open .site-nav__collapse {
    display: block;
  }

  .site-nav__links {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 12px;
  }

  .site-nav__links a {
    min-height: 48px;
    font-size: 16px;
  }

  /* In the phone menu, Research is a label with its three pages listed under it */
  .site-nav .site-nav__sub-toggle,
  .site-nav .site-nav__sub-toggle.hidden {
    min-height: 48px;
    font-size: 16px;
    pointer-events: none;
  }

  .site-nav .site-nav__sub-toggle.is-active {
    background: transparent;
  }

  .site-nav__sub {
    display: block;
    padding-left: 14px;
  }

  .site-nav__sub a {
    padding-top: 8px;
    padding-bottom: 8px;
    font-size: 15px;
    line-height: 1.35;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav * {
    transition: none !important;
  }
}

@media print {
  .site-nav {
    display: none;
  }
}