/* ==========================================================================
   Project principles ticker

   Framework neutral:
   - PyData Sphinx Theme
   - Furo
   - plain Sphinx
   - MkDocs
   - Hugo
   - other static HTML documentation systems

   Public configuration:
   - --sp-principles-speed
   - --sp-principles-separator-gap
   - data-sp-menu-placement="up|down"
   ========================================================================== */

.sp-principles {
  --sp-principles-speed: 28s;
  --sp-principles-separator-gap: 0.9rem;

  position: relative;

  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.55rem;

  width: 100%;
  min-width: 0;

  margin-top: auto;
  margin-bottom: auto;

  font-size: 1.2rem;
  font-weight: 500;

  color: currentColor;
}


/* --------------------------------------------------------------------------
   Sliding region
   -------------------------------------------------------------------------- */

.sp-principles__viewport {
  min-width: 0;
  width: 100%;

  overflow: hidden;
  white-space: nowrap;

  -webkit-mask-image:
    linear-gradient(
      to right,
      transparent 0%,
      black 3%,
      black 97%,
      transparent 100%
    );

  mask-image:
    linear-gradient(
      to right,
      transparent 0%,
      black 3%,
      black 97%,
      transparent 100%
    );
}


.sp-principles__track {
  display: flex;
  width: max-content;

  will-change: transform;

  animation:
    sp-principles-scroll
    var(--sp-principles-speed)
    linear
    infinite;
}


.sp-principles__group {
  display: flex;
  flex-shrink: 0;
  align-items: center;

  white-space: nowrap;
}


.sp-principles__item {
  display: inline-flex;
  align-items: center;

  white-space: nowrap;
}


.sp-principles__item::before {
  content: "|";

  margin-inline:
    var(--sp-principles-separator-gap);

  opacity: 0.4;
  font-weight: 400;
}


.sp-principles__group::after {
  content: "|";

  margin-inline:
    var(--sp-principles-separator-gap);

  opacity: 0.4;
  font-weight: 400;
}


/* --------------------------------------------------------------------------
   Infinite animation
   -------------------------------------------------------------------------- */

@keyframes sp-principles-scroll {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    transform: translate3d(-50%, 0, 0);
  }
}


/* --------------------------------------------------------------------------
   Runtime state
   -------------------------------------------------------------------------- */

.sp-principles__track[data-paused="true"] {
  animation-play-state: paused;
}


.sp-principles__track[data-reverse="true"] {
  animation-direction: reverse;
}


/* --------------------------------------------------------------------------
   Compact hamburger menu
   -------------------------------------------------------------------------- */

.sp-principles__menu {
  position: relative;

  flex-shrink: 0;

  margin: 0;
  padding: 0;
}


.sp-principles__menu-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 36px;
  height: 36px;

  padding: 0;

  border:
    1px solid
    rgba(128, 128, 128, 0.35);

  border-radius: 0.45rem;

  background:
    rgba(128, 128, 128, 0.05);

  color: inherit;

  cursor: pointer;
  list-style: none;
}


.sp-principles__menu-trigger::-webkit-details-marker {
  display: none;
}


.sp-principles__menu-trigger::marker {
  content: "";
}


/* Dependency-free three-line menu icon. */
.sp-principles__menu-icon,
.sp-principles__menu-icon::before,
.sp-principles__menu-icon::after {
  display: block;

  width: 15px;
  height: 1.5px;

  border-radius: 999px;

  background: currentColor;
}


.sp-principles__menu-icon {
  position: relative;
}


.sp-principles__menu-icon::before,
.sp-principles__menu-icon::after {
  position: absolute;
  left: 0;

  content: "";
}


.sp-principles__menu-icon::before {
  top: -5px;
}


.sp-principles__menu-icon::after {
  top: 5px;
}


@media (hover: hover) and (pointer: fine) {
  .sp-principles__menu-trigger:hover {
    background:
      rgba(128, 128, 128, 0.11);
  }
}


.sp-principles__menu-trigger:focus-visible {
  outline:
    2px solid currentColor;

  outline-offset: 2px;
}


.sp-principles__menu[open]
.sp-principles__menu-trigger {
  background:
    rgba(128, 128, 128, 0.16);

  border-color: currentColor;
}


/*
 * Footer-friendly default: open upward.
 */
.sp-principles__menu-panel {
  position: absolute;
  right: 0;
  bottom: calc(100% + 0.45rem);
  z-index: 40;

  display: grid;
  gap: 0.3rem;

  width: max-content;
  min-width: 240px;
  max-width: min(280px, calc(100vw - 1.5rem));

  padding: 0.4rem;

  border:
    1px solid
    var(
      --bd-border-color,
      rgba(128, 128, 128, 0.4)
    );

  border-radius: 0.6rem;

  background:
    var(--bd-content-bg, Canvas);

  color:
    var(--bd-text-color, CanvasText);

  box-shadow:
    0 8px 24px
    rgba(0, 0, 0, 0.14);

  font-size: 0.78rem;
  font-weight: 400;
}


/*
 * Optional top-of-page placement.
 */
.sp-principles[data-sp-menu-placement="down"]
.sp-principles__menu-panel {
  top: calc(100% + 0.45rem);
  bottom: auto;
}


/* --------------------------------------------------------------------------
   Menu content
   -------------------------------------------------------------------------- */

.sp-principles__menu-section {
  display: grid;
  gap: 0.2rem;
}


.sp-principles__menu-heading {
  padding:
    0.25rem
    0.55rem
    0.15rem;

  font-size: 0.66rem;
  font-weight: 700;

  letter-spacing: 0.06em;
  text-transform: uppercase;

  opacity: 0.62;
}


.sp-principles__menu-button {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.1rem;

  width: 100%;
  min-height: 44px;

  padding:
    0.45rem
    0.6rem;

  border:
    1px solid
    transparent;

  border-radius: 0.42rem;

  background: transparent;
  color: inherit;

  text-align: left;

  font: inherit;

  cursor: pointer;
}


.sp-principles__menu-button-title {
  font-size: 0.8rem;
  font-weight: 650;
  line-height: 1.2;
}


.sp-principles__menu-button-desc {
  font-size: 0.68rem;
  font-weight: 400;
  line-height: 1.25;

  opacity: 0.72;
}


@media (hover: hover) and (pointer: fine) {
  .sp-principles__menu-button:hover,
  .sp-principles__speed-button:hover {
    background:
      rgba(128, 128, 128, 0.09);
  }
}


.sp-principles__menu-button:focus-visible,
.sp-principles__speed-button:focus-visible {
  outline:
    2px solid currentColor;

  outline-offset: 1px;
}


.sp-principles__menu-button[aria-pressed="true"] {
  border-color:
    rgba(128, 128, 128, 0.35);

  background:
    rgba(128, 128, 128, 0.14);
}


.sp-principles__menu-button[aria-pressed="true"]
.sp-principles__menu-button-title::before {
  content: "✓";

  margin-right: 0.4rem;
}


/* --------------------------------------------------------------------------
   Speed presets
   -------------------------------------------------------------------------- */

.sp-principles__speed-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.25rem;

  padding:
    0
    0.35rem
    0.2rem;
}


.sp-principles__speed-button {
  min-width: 0;
  min-height: 36px;

  padding:
    0.35rem
    0.45rem;

  border:
    1px solid
    rgba(128, 128, 128, 0.28);

  border-radius: 0.38rem;

  background: transparent;
  color: inherit;

  font: inherit;
  font-size: 0.7rem;
  font-weight: 550;

  cursor: pointer;
}


.sp-principles__speed-button[aria-pressed="true"] {
  border-color: currentColor;

  background:
    rgba(128, 128, 128, 0.14);

  font-weight: 700;
}


.sp-principles__menu-separator {
  height: 1px;

  margin:
    0.1rem
    0.25rem;

  background:
    rgba(128, 128, 128, 0.25);
}


/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 700px) {
  .sp-principles {
    gap: 0.35rem;

    font-size: 1rem;
  }


  .sp-principles__menu-trigger {
    width: 34px;
    height: 34px;
  }


  .sp-principles__menu-panel {
    max-width:
      min(
        260px,
        calc(100vw - 1rem)
      );
  }
}


/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .sp-principles__track {
    animation: none;
  }


  .sp-principles__viewport {
    overflow-x: auto;

    -webkit-mask-image: none;
    mask-image: none;
  }


  .sp-principles__group[aria-hidden="true"] {
    display: none;
  }
}