fizzy/app/assets/stylesheets/trays.css

@layer components {
  /* Container
  /* ------------------------------------------------------------------------ */

  .tray {
    --tray-duration: 350ms;
    --tray-margin: 0.5rem;
    --tray-radius: 0.25rem;
    --tray-item-height: 76px; /* FIXME: Magic number */

    align-items: end;
    block-size: var(--footer-height);
    display: grid;
    inset-block: auto env(safe-area-inset-bottom);
    inline-size: var(--tray-size);
    position: fixed;
    transition: inset var(--tray-duration) var(--ease-out-overshoot-subtle);
    z-index: var(--z-tray);

    /* Make the dialog, expander, and actions inhabit the same space */
    > * {
      grid-column-start: 1;
      grid-row-start: 1;
    }

    @media (max-width: 799px) {
      &:has(.tray__dialog[open]) {
        background-color: var(--color-terminal-bg);
        inline-size: calc(100% - var(--tray-margin) * 2);
        inset-inline-start: var(--tray-margin);
        z-index: calc(var(--z-tray) + 2);
      }
    }
  }

  /* Dialog
  /* ------------------------------------------------------------------------ */

  .tray__dialog {
    background-color: transparent;
    display: flex;
    flex-direction: column-reverse;
    inline-size: auto;
    inset: auto 0 0 0;
    position: absolute;
    transition: var(--tray-duration) var(--ease-out-overshoot-subtle);
    transition-property: background-color, box-shadow, inset-block-end;

    &[open] {
      border-radius: var(--tray-radius);
      box-shadow:
        0 0 0 1px var(--color-ink-lighter),
        0 0 16px oklch(var(--lch-black) / 33%);
      inset-block-end: calc(var(--footer-height) - 0.75ch);
    }

    &:not([open]) {
      block-size: var(--footer-height);
      pointer-events: none;

      /* On desktop, when there aren't items, tweak the hat so it doesn't look
         like it's coming from the bottom of the viewport */
      @media (min-width: 800px) {
        &:not(:has(.tray__item--notification)) {
          .tray__item--hat {
            margin-block-end: 0;
            opacity: 0;
          }
        }
      }
    }
  }

  /* Expander
  /* ------------------------------------------------------------------------ */

  .tray__toggle {
    align-self: stretch;
    background: none;
    border: 0;
    display: block;
    padding: 0;
    transition: opacity 100ms ease-out;

    .icon {
      color: var(--color-ink);
      display: none;
    }

    .tray__toggle-text {
      display: contents;
    }

    @media (max-width: 799px) {
      /* When collapsed on mobile, make it small */
      .tray__dialog:not([open]) ~ & {
        inline-size: var(--footer-height);

        .tray__toggle-btn {
          border: 0;
        }

        .icon {
          display: block;
        }

        .tray__toggle-text {
          display: none;
        }
      }

      /* Show a red dot if there are items to show */
      .tray__dialog:not([open]):has(.tray__item--notification) ~ &:after {
        background: oklch(var(--lch-red-medium));
        block-size: 1ch;
        border-radius: 50%;
        content: "";
        inline-size: 1ch;
        inset: 25% 25% auto auto;
        position: absolute;
      }
    }

    /* On desktop… */
    @media (min-width: 800px) {
      .tray__dialog:not([open]):has(.tray__item:not(.tray__item--hat)) ~ & {
        block-size: var(--tray-item-height);
        translate: 0 -1.85rem;
      }

      /* Hide the UI when collapsed, but only if there are items */
      .tray__dialog:not([open]):has(.tray__item--notification) ~ & {
        opacity: 0;
      }
    }
  }


  .tray__toggle-btn {
    --btn-background: transparent;
    --btn-border-size: 0;
    --btn-color: var(--color-ink);

    inline-size: 100%;
    opacity: 0.66;
  }

  /* Item
  /* ------------------------------------------------------------------------ */

  .tray__item {
    --tray-item-delay: calc((var(--tray-item-index) - 1) * 20ms);
    --tray-item-index: 1;
    --tray-item-margin: calc(-1 * var(--tray-item-height) + var(--tray-item-offset));
    --tray-item-offset: var(--block-space-half); /* The amount they overlap */
    --tray-item-scale: calc(1 - (var(--tray-item-index) - 1) / 30);
    --tray-item-z: calc(6 - var(--tray-item-index));

    position: relative;

    .tray__dialog & {
      font-size: 10px;
      margin-block-end: var(--tray-item-margin);
      transition: var(--tray-duration) var(--ease-out-overshoot-subtle);
      transition-delay: var(--tray-item-delay);
      transition-property: margin, opacity, scale;


      &:not(.tray__item--hat) {
        z-index: var(--tray-item-z);
      }

      &:has(*:focus-visible) {
        z-index: calc(var(--tray-item-z) + 1);
      }

      &:first-child {
        --tray-item-margin: var(--tray-margin);
      }

      &:not(:first-child) {
        scale: var(--tray-item-scale);
      }

      &:nth-child(1) { --tray-item-index: 1; }
      &:nth-child(2) { --tray-item-index: 2; }
      &:nth-child(3) { --tray-item-index: 3; }
      &:nth-child(4) { --tray-item-index: 4; }
      &:nth-child(5) { --tray-item-index: 5; }
      &:nth-child(6) { --tray-item-index: 6; }
      &:nth-child(7) { --tray-item-index: 7; }
      &:nth-child(8) { --tray-item-index: 8; }
      &:nth-child(9) { --tray-item-index: 9; }
      &:nth-child(10) { --tray-item-index: 10; }
    }

    .tray__dialog[open] & {
      --tray-item-margin: 0;
      --tray-item-scale: 1;
    }

    .tray__dialog:not([open]) & {
      @media (max-width: 799px) {
        opacity: 0;
      }
    }

    .bubble {
      display: none;
    }
  }

  .tray__item--hat {
    --tray-hat-bg: var(--color-canvas);
    --tray-item-scale: 1;

    background-color: var(--tray-hat-bg);
    border-block-end: 1px solid var(--color-ink-lighter);
    border-radius: var(--tray-radius) var(--tray-radius) 0 0;
    block-size: var(--tray-item-height);
    display: flex;
    opacity: 0;
    padding: 0.5ch;

    .btn {
      --btn-background: var(--tray-hat-bg);
      --btn-border-radius: 0.5ch;
      --btn-padding: 1.25ch 0.5ch 1ch;

      block-size: 100%;
      display: flex;
      flex-direction: column;
      font-weight: normal;
      gap: 0.25ch;
      inline-size: 100%;

      &:focus-visible {
        z-index: 1;
      }

      @media (max-width: 1060px) {
        > span:not(.icon) {
          font-size: 12px;
        }
      }

      .tray__dialog:not([open]) & {
        pointer-events: none;
      }
    }

    > *:is(:first-child, :last-child) {
      inline-size: 128px;
    }

    .tray__dialog[open] & {
      opacity: 1;
    }

    .tray__new-notifications {
      display: none;
      position: relative;
    }

    .tray__dialog:has(.tray__item:nth-child(1n + 7)) & {
      .tray__old-notifications { display: none; }
      .tray__new-notifications { display: flex; }

      .btn:has(.tray__new-notifications) { /* Red dot */
        &:after {
          background-color: oklch(var(--lch-red-medium));
          block-size: 1ch;
          border-radius: 50%;
          box-shadow: 0 0 0 1px var(--tray-hat-bg);
          content: "";
          inline-size: 1ch;
          inset: 25% auto auto 50%;
          position: absolute;
          translate: 25% -75%;
        }
      }
    }
  }

  /* Tray cards
  /* ------------------------------------------------------------------------ */

  .tray {
    .card {
      --card-padding-block: 1.5ch;
      --card-padding-inline: 1.5ch;
      --text-xx-large: 2em;

      block-size: var(--tray-item-height);
      view-transition-name: unset !important;

      [open] & {
        box-shadow: 0 0 0 1px var(--color-ink-lighter);
        border: 0;
        border-radius: 0;
      }

      @media (prefers-color-scheme: dark) {
        box-shadow: 0 0 0 1px var(--color-ink-lighter);
      }
    }

    .card__background {
      display: none;
    }

    .card__body {
      margin-block-start: 0.2em;
      padding-block-end: 0;
    }

    .card__board {
      padding-block: 0.25ch;
    }

    .card__title {
      --lines: 1;

      font-size: var(--text-small);
      font-weight: bold;
      min-block-size: 0;
    }
  }

  /* Pin-specific styles
  /* ------------------------------------------------------------------------ */

  .tray--pins {
    inset-inline: var(--tray-margin) auto;
    view-transition-name: tray-pins;

    #footer:has(.bar__placeholder[hidden]) & {
      inset-inline-start: -100%;
    }

    .tray__item {
      --tray-item-z: calc(10 - var(--tray-item-index));

      position: relative;

      [open] &[aria-selected] {
        outline: 0;
        z-index: calc(var(--tray-item-z) + 2);

        .card__link {
          border-radius: 0.25ch;
          outline: var(--focus-ring-size) solid var(--focus-ring-color);
          outline-offset: var(--focus-ring-offset);
          z-index: 1;
        }
      }

      /* Show 6 max items on smallest devices */
      @media (max-height: 578px) {
        &:nth-child(1n + 7) { display: none; }
      }

      /* 7 max */
      @media (min-height: 578px) and (max-height: 656px) {
        &:nth-child(1n + 8) { display: none; }
      }

      /* 8 max */
      @media (min-height: 656px) and (max-height: 734px) {
        &:nth-child(1n + 9) { display: none; }
      }

      /* 9 max */
      @media (min-height: 734px) and (max-height: 812px) {
        &:nth-child(1n + 10) { display: none; }
      }

      /* 10 max on larger screens */
      @media (min-height: 812px) {
        &:nth-child(1n + 11) { display: none; }
      }

      &:not([aria-selected]) .card__link:focus-visible,
      .tray__dialog:not([open]) & .card__link:focus-visible {
        --focus-ring-size: 0;
      }
    }

    .tray__remove-pin-btn {
      --btn-icon-size: 1.25em;
      --btn-size: 2em;

      background-color: var(--card-bg-color);
      inset: 0 0 auto auto;
      opacity: 0;
      pointer-events: none;
      position: absolute;
      z-index: 1;

      .tray__dialog[open] & {
        opacity: 0.66;
        pointer-events: unset;

        &:hover {
          opacity: 1;
        }
      }
    }

    .avatar,
    .card__tags,
    .card__meta .btn,
    .card__meta-text:not(.card__meta-text--updated),
    .card__stages,
    .card__steps,
    .card__closed {
      display: none;
    }

    .card__header {
      margin-block-start: calc(var(--card-padding-block) * -1.1);
      margin-inline: calc(-1 * var(--card-padding-inline));
      max-inline-size: unset;
    }

    .card__body {
      display: block;
      margin-block-start: 0.3em;
    }

    .card__column-name--current {
      --btn-padding: 0.1em 0.5em;

      background: none !important;
      border: 1px solid currentColor;
      color: var(--color-ink);
      display: inline-flex;
      flex: 0 1 auto;
      inline-size: fit-content;
      margin: 0 0 0 auto;
      transition: translate 150ms ease-out;

      [open] & {
        translate: -2em;
      }
    }

    .card__link {
      z-index: 1;
    }

    .card__footer {
      margin-block: -0.2em 2em;

      .icon { display: none; }
    }

    .card__meta {
      grid-template-areas: "text-updated";
      grid-template-columns: 1fr;
    }

    .card__meta-text {
      line-height: 1.5;
    }

    .card__meta-text--updated {
      border: 0;
      font-size: var(--text-x-small);
      opacity: 0.66;
      padding: 0;
      text-transform: none;

      .local-time-value {
        font-weight: inherit;
      }
    }

    .card__bubble {
      display: none;
    }

    /* Disable the expander if there aren't items to show */
    .tray__dialog:not(:has(.tray__item)) ~ .tray__toggle {
      opacity: 0.5;

      &, .tray__toggle-btn {
        pointer-events: none;
      }
    }

    /* Add a border on mobile */
    @media (max-width: 799px) {
      .tray__dialog:not([open]) ~ .tray__toggle {
        border-inline-end: 1px dashed var(--color-ink-light);
        translate: calc(-1 * var(--tray-margin)) 0;
      }

    }
  }

  ::view-transition-group(tray-pins) {
    z-index: 100;
  }

  /* Notification-specific styles
  /* ------------------------------------------------------------------------ */

  .tray--notifications {
    inset-inline: auto var(--tray-margin);
    view-transition-name: tray-notifications;

    #footer:has(.bar__placeholder[hidden]) & {
      inset-inline-end: -100%;
    }

    .tray__item,
    [data-navigable-list-target~=item] {
      [open] &[aria-selected] {
        outline: 0;
        z-index: calc(var(--tray-item-z) + 2);

        .card,
        .tray__item--hat & .btn {
          border-radius: 0.25ch;
          outline: var(--focus-ring-size) solid var(--focus-ring-color);
          outline-offset: var(--focus-ring-offset);
        }
      }

      &:nth-child(1n + 7) {
        display: none;
        pointer-events: none;
        visibility: hidden;
      }

      &:not([aria-selected]) .card:focus-visible,
      .tray__dialog:not([open]) & .card:focus-visible {
        --focus-ring-size: 0;
      }

      .btn:focus-visible {
        outline: 0;
      }
    }

    &:not(:has(.card--notification)) {
      .tray__notification-read-action {
        visibility: hidden;
      }
    }

    .card__notification-unread-indicator {
      --btn-icon-size: 1.25em;
      --btn-size: 2em;
    }

    /* On mobile… */
    @media (max-width: 799px) {
      /* …add a border */
      .tray__dialog:not([open]) ~ .tray__toggle {
        border-inline-start: 1px dashed var(--color-ink-light);
        translate: var(--tray-margin) 0;
      }
    }
  }

  ::view-transition-group(tray-notifications) {
    z-index: 100;
  }
}