/* Layout behind opm/layout.html.j2, modelled on the jinks base layout.

   Regions: header and hero across the page; before-top / content-top /
   after-top above before / content / after; footer across the page. A region
   the template leaves empty is not rendered, and its column takes no room.

   A theme adjusts it through custom properties rather than by overriding
   these rules:
     --opm-layout-before-width, --opm-layout-after-width   sidebar columns
     --opm-layout-content-max   widest the content column grows (default: all)
     --opm-layout-gap           space between a sidebar and the content
     --opm-layout-gutter        least space at the page edges
     --opm-layout-sticky-top    how far below the viewport top sticky sidebars
                                stop, e.g. the height of a sticky header

   Page chrome (the menubar and toolbar layout.html.j2 writes):
     --opm-background-color, --opm-color, --opm-color-muted,
     --opm-color-rule, --opm-color-accent
     --opm-background-color-drawer  background of a sidebar opened as a drawer
     --opm-font-body, --opm-font-ui
     --opm-menubar-max          widest the menubar's content grows
*/

:root {
  --opm-background-color: Canvas;
  --opm-color: CanvasText;
  --opm-color-muted: color-mix(in srgb, CanvasText 65%, Canvas);
  --opm-color-rule: color-mix(in srgb, CanvasText 18%, Canvas);
  --opm-color-accent: LinkText;
  --opm-font-body: system-ui, -apple-system, "Segoe UI", sans-serif;
  --opm-font-ui: var(--opm-font-body);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

:where(body) {
  margin: 0;
  background: var(--opm-background-color);
  color: var(--opm-color);
  font-family: var(--opm-font-body);
  line-height: 1.5;
}

/* Menubar: the logo and menu links on the left, the template's controls and
   the drawer triggers on the right. Each side is a list, as in jinks. */
.page-header {
  background: var(--opm-background-color);
  border-bottom: 1px solid var(--opm-color-rule);
}

.menubar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  max-width: var(--opm-menubar-max, 76rem);
  min-height: 3.5rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  font-family: var(--opm-font-ui);
}

.menubar ul,
.toolbar ul {
  display: flex;
  align-items: center;
  gap: 0.5rem 1rem;
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.menubar > ul:last-child {
  flex: none;
}

.menubar a {
  color: inherit;
  text-decoration: none;
}

.menubar a:hover {
  color: var(--opm-color-accent);
}

.menubar .logo {
  min-width: 0;
}

.menubar .logo a {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  min-width: 0;
  color: var(--opm-color);
}

.logo__image {
  flex: none;
  align-self: center;
  height: 2rem;
  width: auto;
}

.logo__title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--opm-font-body);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.menubar .logo a:hover .logo__title {
  color: var(--opm-color-accent);
}

/* Toolbar: breadcrumbs on the left, controls and page links on the right. */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding-block: 0.75rem;
  font-family: var(--opm-font-ui);
  font-size: 0.85rem;
}

.toolbar .breadcrumb {
  min-width: 0;
}

.toolbar .breadcrumb :is(ul, ol) {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}

.toolbar .breadcrumb li:not(:last-child)::after {
  content: "›";
  margin: 0 0.5rem;
  color: var(--opm-color-muted);
}

.toolbar a {
  color: inherit;
}

.toolbar__navigation {
  display: flex;
  gap: 1rem;
}

.opm-layout {
  --opm-layout-before-track: 0px;
  --opm-layout-after-track: 0px;
  display: grid;
  min-height: 100vh;
  grid-template-columns:
    minmax(var(--opm-layout-gutter, 1rem), 1fr)
    var(--opm-layout-before-track)
    minmax(0, var(--opm-layout-content-max, 100%))
    var(--opm-layout-after-track)
    minmax(var(--opm-layout-gutter, 1rem), 1fr);
  grid-template-rows: auto auto auto 1fr auto;
  grid-template-areas:
    "header header     header      header    header"
    "hero   hero       hero        hero      hero"
    ".      before-top content-top after-top ."
    ".      before     content     after     ."
    "footer footer     footer      footer    footer";
}

.opm-layout.has-before {
  --opm-layout-before-track: var(--opm-layout-before-width, 18rem);
}

.opm-layout.has-after {
  --opm-layout-after-track: var(--opm-layout-after-width, 18rem);
}

.opm-layout > .page-header {
  grid-area: header;
  position: sticky;
  top: 0;
  z-index: 10;
}

.opm-layout > .hero {
  grid-area: hero;
}

.opm-layout > .before-top {
  grid-area: before-top;
  padding-inline-end: var(--opm-layout-gap, 2rem);
}

.opm-layout > .content-top {
  grid-area: content-top;
  min-width: 0;
}

.opm-layout > .after-top {
  grid-area: after-top;
  padding-inline-start: var(--opm-layout-gap, 2rem);
}

.opm-layout > .opm-main {
  grid-area: content;
  min-width: 0;
}

.opm-layout > .before,
.opm-layout > .after {
  align-self: start;
  position: sticky;
  top: var(--opm-layout-sticky-top, 0px);
  max-height: calc(100vh - var(--opm-layout-sticky-top, 0px));
  overflow-y: auto;
  overscroll-behavior: contain;
  min-width: 0;
}

.opm-layout > .before {
  grid-area: before;
  padding-inline-end: var(--opm-layout-gap, 2rem);
}

.opm-layout > .after {
  grid-area: after;
  padding-inline-start: var(--opm-layout-gap, 2rem);
}

.opm-layout > .page-footer {
  grid-area: footer;
}

/* Visible only when focused from the keyboard. */
.opm-skip {
  position: absolute;
  left: -9999px;
  z-index: 40;
}

.opm-skip:focus {
  left: 1rem;
  top: 1rem;
  padding: 0.5rem 0.75rem;
  background: Canvas;
  color: CanvasText;
}

/* Drawers: only on narrow screens. The checkbox keeps them working without
   JavaScript; the labels that open and close them are hidden on wide screens. */
.opm-drawer__toggle {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.trigger,
.opm-drawer__head,
.opm-drawer__backdrop {
  display: none;
}

@media (max-width: 64em) {
  .opm-layout {
    grid-template-columns:
      minmax(var(--opm-layout-gutter, 1rem), 1fr)
      minmax(0, var(--opm-layout-content-max, 100%))
      minmax(var(--opm-layout-gutter, 1rem), 1fr);
    grid-template-rows: auto auto auto 1fr auto auto auto;
    grid-template-areas:
      "header header      header"
      "hero   hero        hero"
      ".      content-top ."
      ".      content     ."
      ".      before      ."
      ".      after       ."
      "footer footer      footer";
  }

  .opm-layout > .before-top,
  .opm-layout > .after-top {
    display: none;
  }

  /* A sidebar shown below the content. */
  .opm-layout > :is(.before, .after) {
    position: static;
    max-height: none;
    overflow: visible;
    padding-inline: 0;
  }

  .trigger {
    display: list-item;
  }

  .opm-drawer__open,
  .opm-drawer__close {
    cursor: pointer;
  }

  /* A sidebar that slides in over the page. */
  .opm-before--drawer > .before,
  .opm-after--drawer > .after {
    position: fixed;
    top: 0;
    bottom: 0;
    /* A positioned grid item aligned to start would shrink to its content
       instead of spanning top to bottom. */
    align-self: stretch;
    z-index: 30;
    width: min(85vw, 22rem);
    max-height: none;
    padding: 1rem;
    overflow-y: auto;
    background: var(--opm-background-color-drawer, Canvas);
    box-shadow: 0 0 1.5rem rgba(0, 0, 0, 0.25);
    visibility: hidden;
    transition: transform 0.25s ease, visibility 0.25s;
  }

  .opm-before--drawer > .before {
    left: 0;
    transform: translateX(-100%);
  }

  .opm-after--drawer > .after {
    right: 0;
    transform: translateX(100%);
  }

  #opm-before-toggle:checked ~ .before,
  #opm-after-toggle:checked ~ .after {
    transform: none;
    visibility: visible;
  }

  /* The drawer's own head: its label and the link that closes it. */
  .opm-drawer__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
  }

  .opm-drawer__backdrop {
    position: fixed;
    inset: 0;
    z-index: 20;
    background: rgba(0, 0, 0, 0.35);
  }

  .opm-drawer__backdrop label {
    position: absolute;
    inset: 0;
    display: none;
  }

  #opm-before-toggle:checked ~ .opm-drawer__backdrop,
  #opm-after-toggle:checked ~ .opm-drawer__backdrop {
    display: block;
  }

  #opm-before-toggle:checked ~ .opm-drawer__backdrop label[for="opm-before-toggle"],
  #opm-after-toggle:checked ~ .opm-drawer__backdrop label[for="opm-after-toggle"] {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .opm-before--drawer > .before,
  .opm-after--drawer > .after {
    transition: none;
  }
}

@media print {
  .opm-layout {
    display: block;
    min-height: 0;
  }

  .opm-layout > :is(.page-header, .before, .before-top, .after-top),
  .toolbar {
    display: none;
  }

  .opm-layout > .after {
    position: static;
    max-height: none;
    overflow: visible;
  }
}