/* See ./header.md for design notes and rationale. */

header .nav-wrapper {
  background-color: var(--background-color);
  inline-size: 100%;
  z-index: 2;
  position: fixed;
}

header .nav-wrapper nav {
  box-sizing: border-box;
  display: grid;
  grid-template:
    'hamburger brand tools' var(--nav-height)
    'sections sections sections' 1fr / auto 1fr auto;
  align-items: center;
  gap: 0 24px;
  margin: auto;
  max-inline-size: 1248px;
  block-size: var(--nav-height);
  padding: 0 24px;
  font-family: var(--body-font-family);
}

header .nav-wrapper nav[aria-expanded='true'] {
  grid-template:
    'hamburger brand' var(--nav-height)
    'sections sections' 1fr
    'tools tools' var(--nav-height) / auto 1fr;
  overflow-block: auto;
  min-block-size: 100dvh;
}

@media (width >= 900px) {
  header .nav-wrapper {
    position: relative;
  }

  header .nav-wrapper nav {
    display: flex;
    justify-content: space-between;
    gap: 0 32px;
    max-inline-size: 1264px;
    padding: 0 32px;
  }

  header .nav-wrapper nav[aria-expanded='true'] {
    min-block-size: 0;
    overflow: visible;
  }
}

header .nav-wrapper nav p {
  margin: 0;
  line-height: 1;
}

header .nav-wrapper nav a:any-link {
  color: currentcolor;
}

/* hamburger */
header .nav-wrapper nav .nav-hamburger {
  grid-area: hamburger;
  block-size: 22px;
  display: flex;
  align-items: center;
}

header .nav-wrapper nav .nav-hamburger button {
  block-size: 22px;
  margin: 0;
  border: 0;
  border-radius: 0;
  padding: 0;
  background-color: var(--background-color);
  color: inherit;
  overflow: initial;
  text-overflow: initial;
  white-space: initial;
}

header .nav-wrapper nav .nav-hamburger-icon,
header .nav-wrapper nav .nav-hamburger-icon::before,
header .nav-wrapper nav .nav-hamburger-icon::after {
  box-sizing: border-box;
  display: block;
  position: relative;
  inline-size: 20px;
}

header .nav-wrapper nav .nav-hamburger-icon::before,
header .nav-wrapper nav .nav-hamburger-icon::after {
  content: '';
  position: absolute;
  background: currentcolor;
}

header .nav-wrapper nav[aria-expanded='false'] .nav-hamburger-icon,
header .nav-wrapper nav[aria-expanded='false'] .nav-hamburger-icon::before,
header .nav-wrapper nav[aria-expanded='false'] .nav-hamburger-icon::after {
  block-size: 2px;
  border-radius: 2px;
  background: currentcolor;
}

header .nav-wrapper nav[aria-expanded='false'] .nav-hamburger-icon::before {
  inset-block-start: -6px;
}

header .nav-wrapper nav[aria-expanded='false'] .nav-hamburger-icon::after {
  inset-block-start: 6px;
}

header .nav-wrapper nav[aria-expanded='true'] .nav-hamburger-icon {
  block-size: 22px;
}

header .nav-wrapper nav[aria-expanded='true'] .nav-hamburger-icon::before,
header .nav-wrapper nav[aria-expanded='true'] .nav-hamburger-icon::after {
  inset-block-start: 3px;
  inset-inline-start: 1px;
  transform: rotate(45deg);
  transform-origin: 2px 1px;
  inline-size: 24px;
  block-size: 2px;
  border-radius: 2px;
}

header .nav-wrapper nav[aria-expanded='true'] .nav-hamburger-icon::after {
  inset-block-start: unset;
  inset-block-end: 3px;
  transform: rotate(-45deg);
}

@media (width >= 900px) {
  header .nav-wrapper nav .nav-hamburger {
    display: none;
    visibility: hidden;
  }
}

/* brand */
header .nav-brand {
  grid-area: brand;
  flex-basis: 128px;
  font-size: var(--heading-font-size-s);
  font-weight: 700;
  line-height: 1;
}

header .nav-wrapper nav .nav-brand img {
  inline-size: 128px;
  block-size: auto;
}

/* sections */
header .nav-wrapper nav .nav-sections {
  grid-area: sections;
  flex: 1 1 auto;
  display: none;
  visibility: hidden;
}

header .nav-wrapper nav[aria-expanded='true'] .nav-sections {
  display: block;
  visibility: visible;
  align-self: start;
}

header .nav-wrapper nav .nav-sections ul {
  list-style: none;
  padding-inline-start: 0;
  font-size: var(--body-font-size-s);
}

header .nav-wrapper nav .nav-sections ul > li {
  font-weight: 500;
}

header .nav-wrapper nav .nav-sections ul > li > ul {
  margin-block-start: 0;
}

header .nav-wrapper nav .nav-sections ul > li > ul > li {
  font-weight: 400;
}

@media (width >= 900px) {
  header .nav-wrapper nav .nav-sections {
    display: block;
    visibility: visible;
    white-space: nowrap;
  }

  header .nav-wrapper nav[aria-expanded='true'] .nav-sections {
    align-self: unset;
  }

  header .nav-wrapper nav .nav-sections .nav-drop {
    position: relative;
    padding-inline-end: 16px;
    cursor: pointer;
  }

  header .nav-wrapper nav .nav-sections .nav-drop::after {
    content: '';
    display: inline-block;
    position: absolute;
    inset-block-start: 8px;
    inset-inline-end: 2px;
    transform: rotate(135deg);
    inline-size: 6px;
    block-size: 6px;
    border: 2px solid currentcolor;
    border-start-end-radius: 1px;
    border-block-start-width: 2px;
    border-inline-end-width: 2px;
    border-block-end-width: 0;
    border-inline-start-width: 0;
  }

  header .nav-wrapper nav .nav-sections .nav-drop[aria-expanded='true']::after {
    inset-block-start: unset;
    inset-block-end: 8px;
    transform: rotate(315deg);
  }

  header .nav-wrapper nav .nav-sections ul {
    display: flex;
    gap: 24px;
    margin: 0;
  }

  header .nav-wrapper nav .nav-sections .default-content-wrapper > ul > li {
    flex: 0 1 auto;
    position: relative;
  }

  header .nav-wrapper nav .nav-sections .default-content-wrapper > ul > li > ul {
    display: none;
    position: relative;
  }

  header .nav-wrapper nav .nav-sections .default-content-wrapper > ul > li[aria-expanded='true'] > ul {
    display: block;
    position: absolute;
    inset-inline-start: -24px;
    inline-size: 200px;
    inset-block-start: 150%;
    padding: 16px;
    background-color: var(--light-color);
    white-space: initial;
  }

  header .nav-wrapper nav .nav-sections .default-content-wrapper > ul > li > ul::before {
    content: '';
    position: absolute;
    inset-block-start: -8px;
    inset-inline-start: 16px;
    inline-size: 0;
    block-size: 0;
    border-inline-start: 8px solid transparent;
    border-inline-end: 8px solid transparent;
    border-block-end: 8px solid var(--light-color);
  }

  header .nav-wrapper nav .nav-sections .default-content-wrapper > ul > li > ul > li {
    padding: 8px 0;
  }
}

/* tools */
header .nav-wrapper nav .nav-tools {
  grid-area: tools;
}