$mobileBreakpoint: 576px;
$mediumBreakpoint: 800px;

:root {
  --color-gray-50: hsl(60, 9%, 98%);
  --color-gray-100: hsl(60, 5%, 96%);
  --color-gray-200: hsl(20, 6%, 90%);
  --color-gray-300: hsl(24, 6%, 83%);
  --color-gray-400: hsl(24, 5%, 64%);
  --color-gray-500: hsl(25, 5%, 45%);
  --color-gray-600: hsl(33, 5%, 32%);
  --color-gray-700: hsl(30, 6%, 25%);
  --color-gray-800: hsl(12, 6%, 15%);
  --color-gray-900: hsl(24, 10%, 10%);
  --color-gray-950: hsl(20, 14%, 4%);


  --bg: var(--color-gray-50);
  --text: var(--color-gray-950);
  --text-secondary: var(--color-gray-700);
  --nav-bg: hsl(210, 60%, 50%);
  --nav-bg-hover: hsl(210, 60%, 30%);
  --nav-bg-visited: hsl(250, 60%, 50%);
  --nav-text-visited: hsl(250, 60%, 93%);
  --nav-text: hsl(210, 60%, 93%);
  --link: hsl(210, 60%, 30%);
  --link-hover: hsl(210, 60%, 10%);
  --link-visited: hsl(250, 60%, 30%);
  --station-bg: var(--color-gray-50);
  --station-bg-hover: var(--color-gray-400);
  --station-border: var(--color-gray-400);
  --station-border-hover: var(--color-gray-600);
  --elevator-bg: var(--color-gray-100);

  @media (prefers-color-scheme: dark) {
    --bg: var(--color-gray-950);
    --text: var(--color-gray-50);
    --text-secondary: var(--color-gray-400);
    --nav-bg: hsl(210, 60%, 30%);
    --nav-bg-hover: hsl(210, 60%, 10%);
    --nav-bg-visited: hsl(250, 60%, 30%);
    --link: hsl(210, 60%, 60%);
    --link-hover: hsl(210, 60%, 60%);
    --link-visited: hsl(250, 60%, 70%);
    --station-bg: var(--color-gray-950);
    --station-bg-hover: var(--color-gray-600);
    --station-border: var(--color-gray-600);
    --station-border-hover: var(--color-gray-400);
    --elevator-bg: var(--color-gray-900);
  }

  --elevator-list-gap: 3rem;
  --item-radius: 1.5rem;
  --btn-radius: 0.8rem;
  --type-icon-size: 3.2rem;
  --space-s: 0.25rem;
  --space-m: 0.5rem;
  --space-l: 1rem;
  --space-xl: 2rem;
}

.hidden {
  display: none;
}

.text-red {
  color: #e32d2d;
}

.text-orange {
  color: #cc6300;
}

.text-green {
  color: #19942e;
}

body {
  font-family: system-ui, ui-sans-serif, sans-serif;
  font-size: 1.2rem;

  // colors
  background-color: var(--bg);
  color: var(--text);
}

h1 {
  text-align: center;
}

a {
  color: var(--link);
  text-decoration: none;

  &:hover {
    text-decoration: underline;
    color: var(--link-hover);
  }

  &:visited {
    color: var(--link-visited);
  }
}

nav {
  ul {
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--space-m);

    li {
      a {
        font-weight: bold;
        color: var(--nav-text);
        text-decoration: none;

        background-color: var(--nav-bg);
        padding: var(--space-m) var(--space-l);
        cursor: pointer;

        &:hover {
          text-decoration: underline;
          background-color: var(--nav-bg-hover);
        }

        &:visited {
          color: var(--nav-text-visited);
          background-color: var(--nav-bg-visited);
        }
      }
    }
  }
}

main {
  margin: 4em auto;
  max-width: 960px;
}

button, input {
  background-color: var(--station-bg);
  color: var(--text);
  padding: var(--space-m) var(--space-l);
  border-radius: var(--item-radius);
  border: solid 2px var(--station-border);
}

button {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-m);

  &:hover {
    background-color: var(--station-bg-hover);
    border-color: var(--station-border-hover);
  }
}

div.filters {
  display: flex;
  gap: var(--space-m);
  justify-items: stretch;

  button, input {
    font-size: 1.5rem;
  }
}

ul#stationList {
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-m);

  > li.station {
    background-color: var(--station-bg);
    border-radius: var(--item-radius);
    border: solid 0.2rem var(--station-border);
    overflow: hidden;
    position: relative;
    padding: var(--space-m);

    > div.stationSummary {
      display: flex;
      gap: var(--space-m);

      div.typeList {
        flex-shrink: 0;
      }


      div.stationTitle {
        align-self: stretch;
        flex-grow: 1;

        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;

        > h3 {
          font-size: 1.5rem;
          line-height: var(--type-icon-size);
          margin: 0;

          width: 100%;

          @media screen and (min-width: $mobileBreakpoint) {
            width: auto;
          }
        }

        > div.elevator-preview {
          flex-shrink: 0;

          display: flex;
          flex-wrap: wrap;
          justify-content: start;
          width: 100%;

          @media screen and (min-width: $mobileBreakpoint) {
            max-width: calc(2rem * 5);
            justify-content: end;
            width: auto;
          }
        }
      }
    }

    > details {
      width: 100%;

      summary {
        list-style: none;
        border: solid 2px var(--station-border);
        display: inline-flex;
        padding: var(--space-m) var(--space-l);
        border-radius: var(--btn-radius);
        cursor: pointer;
        margin-left: calc(var(--space-m) + var(--type-icon-size));

        &:hover {
          background-color: var(--station-bg-hover);
          border-color: var(--station-border-hover);
        }

        &::after {
          position: absolute;
          top: 0;
          right: 0;
          bottom: 0;
          left: 0;
          z-index: 1;
          pointer-events: auto;
          content: "";
          background-color: rgba(0, 0, 0, 0);
        }

        @media (prefers-reduced-motion: no-preference) {
          transition: margin 150ms ease-out;
        }
      }

      &[open] summary {
        margin-bottom: 1rem;
      }

      > ul {
        padding: 0;
        list-style: none;
        display: flex;
        flex-direction: column;
        gap: var(--elevator-list-gap);
        overflow: hidden;
        position: relative;
        z-index: 20;

        > li.elevator {
          display: flex;
          align-items: start;
          flex-wrap: nowrap;
          padding: var(--space-m);
          gap: var(--space-m);
          position: relative;

          margin: 0 1rem 1rem;
          @media screen and (min-width: $mobileBreakpoint) {
            margin: 0 3rem 1rem;
          }

          // elevator icon
          > span {
            flex-shrink: 0;
          }

          // divider between elevators
          &:not(:first-child):before {
            content: "";
            position: absolute;
            left: 0;
            top: calc(var(--elevator-list-gap) / -2);
            height: 2px;
            width: 100%;
            background: var(--station-border);
          }

          > div.elevatorData {
            width: 100%;
            display: grid;
            flex-direction: column;
            gap: var(--space-l);
            align-items: start;

            grid-template-columns: 1fr;
            @media screen and (min-width: $mediumBreakpoint) {
              grid-template-columns: 1fr 1fr;
            }

            .elevatorInfo {
              font-weight: bold;
              grid-column: 1 / -1;
            }

            .lineList {
              display: flex;
              gap: var(--space-m);
              align-items: center;
              grid-column: 1 / -1;
            }

            .osm {
              grid-column: 1 / -1;
              color: var(--text-secondary);

              dl {
                div {
                  dt {
                    min-width: 18ch;
                  }
                }
              }
            }

            ol.levelList {
              --dot-size: 0.8rem;
              --line-width: 0.3rem;
              --left-space: 1.4rem;

              list-style: none;
              padding-left: var(--left-space);

              > li {
                position: relative;
                //font-size: 1.8rem;
                line-height: 1.8em;

                &:before {
                  background-color: currentColor;
                  width: var(--line-width);
                  content: '';
                  position: absolute;
                  top: 0;
                  bottom: 0;
                  left: calc(var(--left-space) * -1 + var(--dot-size) / 2 - var(--line-width) / 2);
                }

                &:first-child {
                  &:before {
                    top: 0.5lh;
                  }
                }

                &:last-child {
                  &:before {
                    bottom: calc(100% - 0.5lh);
                  }
                }

                &:after {
                  background-color: currentColor;
                  width: var(--dot-size);
                  height: var(--dot-size);
                  border-radius: 100%;
                  content: '';
                  position: absolute;
                  top: calc(0.5lh - (var(--dot-size) / 2));
                  left: calc(var(--left-space) * -1);
                }
              }
            }

            dl {
              display: flex;
              flex-direction: column;
              width: 100%;
              gap: 0.2rem;

              div {
                display: flex;
                align-items: center;
                flex-wrap: wrap;

                dt {
                  flex-shrink: 0;
                  display: flex;
                  gap: var(--space-m);
                  align-items: center;
                  font-weight: bold;
                  min-width: 15ch;

                  @media (max-width: $mobileBreakpoint) {
                    width: 100%;
                  }
                }

                dd {
                  flex-shrink: 0;
                  margin-left: 3rem;

                  @media screen and (min-width: $mobileBreakpoint) {
                    margin-left: 1rem;
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

span.lineChip, span.typeChip {
  font-weight: bold;
  font-size: 0.8em;
  text-align: center;
  box-sizing: border-box;

  &[data-type="U"] {
    background-color: #006ab3;
    color: #ffffff;

    &[data-line="U1"] {
      background-color: #006ab3;
    }

    &[data-line="U2"] {
      background-color: #e2001a;
    }

    &[data-line="U3"] {
      background-color: #ffdd00;
      color: #000000;
    }

    &[data-line="U4"] {
      background-color: #0098a1;
    }
  }

  &[data-type="S"] {
    background-color: #1a962b;
    color: #ffffff;

    &[data-line="S1"] {
      background-color: #1a962b;
    }

    &[data-line="S2"] {
      background-color: #b51143;
    }

    &[data-line="S3"] {
      background-color: #622181;
    }

    &[data-line="S4"] {
      background-color: #be148e;
    }

    &[data-line="S5"] {
      background-color: #0089bb;
    }

    &[data-line="S6"] {
      background-color: #d3da00;
      color: #000000;
    }
  }

  &[data-type="A"] {
    background-color: #f39100;
    color: #ffffff;
  }

  &[data-type="R"] {
    background-color: #000000;
    color: #ffffff;

    @media (prefers-color-scheme: dark) {
      border: solid 2px #ffffff;
    }
  }
}

span.lineChip {
  padding: 0.3em 0.6em;
  min-width: 4ch;

  &[data-type="U"] {
    padding: 0.3em 0.1em;
  }

  &[data-type="S"] {
    border-radius: 2em;
    min-width: 6ch;
  }

  &[data-type="A"] {
    padding: 0.3em 0.1em;
    border-radius: 2em;
  }
}

.typeList {
  width: var(--type-icon-size);
  height: var(--type-icon-size);
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
  align-items: center;
  justify-content: center;
}

span.typeChip {

  --chip-size: 1.5;

  &:only-child {
    --chip-size: 3;
  }

  width: calc(1rem * var(--chip-size));
  min-width: calc(1rem * var(--chip-size));
  height: calc(1rem * var(--chip-size));
  font-size: calc(0.5rem * var(--chip-size));
  display: inline-flex;
  align-items: center;
  justify-content: center;

  &[data-type="U"],
  &[data-type="A"],
  &[data-type="R"],
  &[data-type="S"] {
    border-radius: 100%;
    padding: 0;
  }


}

span[data-icon] {
  display: inline-block;
  vertical-align: top;
  width: 1em;
  height: 1em;
  mask-size: contain;
  mask-position: center;
  mask-repeat: no-repeat;
  background-color: currentColor;
  flex-shrink: 0;

  &.size-s {
    font-size: 1rem
  }

  &.size-m {
    font-size: 1.5rem
  }

  &.size-l {
    font-size: 2rem
  }

  &.size-xl {
    font-size: 3rem
  }

  &[data-icon="location"] {
    mask-image: url(/md_icons/location.svg);
  }

  &[data-icon="elevator"] {
    mask-image: url(/md_icons/elevator.svg);
  }

  &[data-icon="elevator-slash"] {
    mask-image: url(/md_icons/elevator-slash.svg);
  }

  &[data-icon="fit-width"] {
    mask-image: url(/md_icons/fit_width.svg);
  }

  &[data-icon="width"] {
    mask-image: url(/md_icons/width.svg);
  }

  &[data-icon="length"] {
    mask-image: url(/md_icons/height.svg);
  }

  &[data-icon="braille"] {
    mask-image: url(/md_icons/braille.svg);
  }

  &[data-icon="speaker"] {
    mask-image: url(/md_icons/speaker.svg);
  }

  &[data-icon="wheelchair"] {
    mask-image: url(/md_icons/wheelchair.svg);
  }

  &[data-icon="bicycle"] {
    mask-image: url(/md_icons/bicycle.svg);
  }

  &[data-icon="info"] {
    mask-image: url(/md_icons/info.svg);
  }

  &[data-icon="up-down"] {
    mask-image: url(/md_icons/up-down.svg);
  }

  &[data-icon="location-searching"] {
    mask-image: url(/md_icons/location-searching.svg);
  }
}