theme.css

/*
 * The react-brackets default theme.
 *
 * Every rule sits inside :where() in the `components` cascade layer, so any
 * class of yours wins: plain CSS because it is unlayered, and Tailwind
 * utilities because their layer comes later. Override the --rb-* variables for
 * quick changes, or add `unstyled` to a <Bracket> to opt it out entirely.
 */

/*
 * Lightning CSS, used by Vite and Tailwind v4 builds, rewrites light-dark() for
 * older browsers into variables that only exist where the page sets
 * `color-scheme`. Without one, every colour below would be invalid and the
 * bracket would lose its lines, borders and text colour. This sets them to
 * light at the lowest priority, so any `color-scheme` the page sets still wins.
 */
@layer base {
  :where(:root) {
    --lightningcss-light: initial;
    --lightningcss-dark: ;
  }
}

@layer components {
  :where([data-scope="bracket"][data-part="root"]:not([data-unstyled])) {
    --rb-font: inherit;
    --rb-text: light-dark(#18181b, #fafafa);
    --rb-text-muted: light-dark(#71717a, #a1a1aa);
    --rb-surface: light-dark(#ffffff, #18181b);
    --rb-surface-hover: light-dark(#f4f4f5, #27272a);
    --rb-border: light-dark(#e4e4e7, #3f3f46);
    --rb-accent: light-dark(#2563eb, #60a5fa);
    --rb-accent-soft: color-mix(in srgb, var(--rb-accent) 14%, transparent);
    --rb-live: light-dark(#dc2626, #f87171);
    --rb-line: light-dark(#d4d4d8, #52525b);
    --rb-line-width: 1.5px;
    --rb-radius: 10px;
    --rb-shadow: 0 1px 2px rgb(0 0 0 / 0.06);
    --rb-match-width: 13.5rem;
    --rb-match-gap: 0.75rem;
    --rb-column-gap: 3rem;
    --rb-duration: 160ms;

    color: var(--rb-text);
    font-family: var(--rb-font);
    font-size: 0.875rem;

    &,
    & :where([data-scope="bracket"]) {
      box-sizing: border-box;
    }

    & + :where([data-part="root"]) {
      margin-top: 2rem;
    }

    &:where([data-view="paged"]) {
      --rb-column-gap: 1.5rem;
    }

    @media (prefers-reduced-motion: reduce) {
      --rb-duration: 0ms;
    }

    /* Layout */

    & :where([data-part="group-title"]) {
      margin: 0 0 1rem;
      font-size: 1rem;
      font-weight: 600;
    }

    /* A little room inside the clipped edge, so card shadows and focus rings at the edges show whole. */
    & :where([data-part="viewport"]:not([data-mode="fit"], [data-mode="pan-zoom"])) {
      padding: 0.25rem 0.25rem 0.5rem;
    }

    & :where([data-part="viewport"][data-mode="pan-zoom"]) {
      border: 1px solid var(--rb-border);
      border-radius: var(--rb-radius);

      &:active {
        cursor: grabbing;
      }
    }

    /* The bracket starts clear of the frame, and keeps that margin when it is fitted. */
    & :where([data-part="viewport"][data-mode="pan-zoom"] > [data-part="content"]) {
      padding: 1rem;
    }

    & :where([data-part="content"][data-grid]) {
      column-gap: var(--rb-column-gap);
    }

    & :where([data-part="round-title"]) {
      padding-bottom: 0.75rem;
      color: var(--rb-text-muted);
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.04em;
      text-align: center;
      text-transform: uppercase;
    }

    & :where([data-part="cell"]) {
      padding-block: calc(var(--rb-match-gap) / 2);
    }

    & :where([data-part="cell"][data-status="skipped"]),
    & :where([data-part="connector"][data-status="skipped"]) {
      visibility: hidden;
    }

    &:where([data-compact="list"]) :where([data-part="round"]) {
      padding-inline: 0.25rem;
    }

    &:where([data-compact="list"]) :where([data-part="matches"]) {
      display: flex;
      flex-direction: column;
      gap: var(--rb-match-gap);
    }

    /* Matches */

    & :where([data-part="match"]) {
      width: var(--rb-match-width);
      /* Never wider than its round's column, so the gap between rounds holds on narrow screens. */
      max-width: 100%;
      overflow: hidden;
      border: 1px solid var(--rb-border);
      border-radius: var(--rb-radius);
      background: var(--rb-surface);
      box-shadow: var(--rb-shadow);
      transition: border-color var(--rb-duration);

      &:where([role="button"]) {
        cursor: pointer;
      }

      &:where([role="button"]:hover) {
        background: var(--rb-surface-hover);
      }

      &:focus-visible {
        outline: 2px solid var(--rb-accent);
        outline-offset: 2px;
      }

      &:where([data-status="live"]) {
        border-color: var(--rb-live);
      }

      &:where([data-highlighted]) {
        border-color: var(--rb-accent);
      }

      &:where([data-updated]) {
        animation: rb-updated calc(var(--rb-duration) * 4) ease-out;
      }
    }

    &:where([data-view="paged"]) :where([data-part="match"]) {
      width: 100%;
    }

    /* Participants */

    & :where([data-part="participant"]) {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.75rem;
      padding: 0.5rem 0.75rem;
      transition: background-color var(--rb-duration);

      & + :where([data-part="participant"]) {
        border-top: 1px solid var(--rb-border);
      }

      &:where([data-winner]) {
        font-weight: 600;
      }

      &:where([data-loser], [data-empty], [data-bye]) {
        color: var(--rb-text-muted);
      }

      &:where([data-bye]) {
        font-style: italic;
      }

      &:where([data-highlighted]) {
        background: var(--rb-accent-soft);
      }

      &:where([data-entered]) {
        animation: rb-entered calc(var(--rb-duration) * 6) ease-out;
      }
    }

    & :where([data-part="participant-name"]) {
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    & :where([data-part="participant-score"]) {
      font-variant-numeric: tabular-nums;
    }

    & :where([data-part="participant"][data-winner] [data-part="participant-score"]) {
      color: var(--rb-accent);
    }

    /* Connectors */

    & :where([data-part="connector"]) {
      stroke: var(--rb-line);
      stroke-width: var(--rb-line-width);
      transition: stroke var(--rb-duration);

      &:where([data-highlighted]) {
        stroke: var(--rb-accent);
        stroke-width: calc(var(--rb-line-width) + 0.5px);
      }
    }

    /* Controls */

    & :where([data-part="pagination"]) {
      position: relative;
      isolation: isolate;
      display: flex;
      align-items: center;
      gap: 0.25rem;
      margin-top: 0.75rem;
      overflow-x: auto;
      scrollbar-width: none;
    }

    /* Zoom out, the level and zoom in share one pill; fitting sits apart, as its own round button. */
    & :where([data-part="zoom-controls"]) {
      display: flex;
      align-items: center;
      gap: 0.375rem;
    }

    & :where([data-part="zoom-steps"]) {
      border: 1px solid var(--rb-border);
      background: var(--rb-surface);
      box-shadow: var(--rb-shadow);
      display: inline-flex;
      align-items: center;
      border-radius: 999px;
      padding: 0.125rem;
    }

    & :where([data-part="zoom-level"]) {
      min-width: 3.25rem;
      padding-inline: 0.25rem;
      color: var(--rb-text);
      font-size: 0.75rem;
      font-weight: 600;
      font-variant-numeric: tabular-nums;
      text-align: center;
    }

    & :where([data-part="pagination"], [data-part="zoom-controls"]) :where(button) {
      border: 1px solid transparent;
      background: transparent;
      color: var(--rb-text-muted);
      font: inherit;
      cursor: pointer;
      transition:
        background-color var(--rb-duration),
        color var(--rb-duration),
        opacity var(--rb-duration);

      &:hover:not(:disabled) {
        background: var(--rb-surface-hover);
        color: var(--rb-text);
      }

      &:focus-visible {
        outline: 2px solid var(--rb-accent);
        outline-offset: 1px;
      }

      &:disabled {
        opacity: 0.35;
        cursor: default;
      }
    }

    & :where([data-part="pagination"]) :where(button) {
      position: relative;
      flex: none;
      padding: 0.375rem 0.75rem;
      border-radius: 999px;
      font-size: 0.75rem;
    }

    & :where([data-part="zoom-controls"]) :where(button) {
      display: inline-grid;
      place-items: center;
      width: 2rem;
      height: 2rem;
      padding: 0;
      border-radius: 999px;
      font-size: 1rem;
    }

    /* After the shared button reset, so the fit button keeps its own round surface. */
    & :where([data-part="zoom-reset"]) {
      width: 2.25rem;
      height: 2.25rem;
      border-color: var(--rb-border);
      background: var(--rb-surface);
      box-shadow: var(--rb-shadow);
    }

    & :where([data-part="page"][data-active]) {
      border-color: var(--rb-border);
      background: var(--rb-surface);
      color: var(--rb-text);
      font-weight: 600;
    }

    /* An opt-in mark that slides under the round in focus, drawn behind the buttons. */
    & :where([data-part="page-indicator"]) {
      top: 0;
      bottom: 0;
      z-index: -1;
      border-radius: 999px;
      background: var(--rb-accent-soft);
    }

    & :where([data-part="page-previous"], [data-part="page-next"]):dir(rtl) {
      transform: scaleX(-1);
    }
  }

  @keyframes rb-updated {
    from {
      box-shadow: 0 0 0 4px var(--rb-accent-soft);
    }
  }

  @keyframes rb-entered {
    from {
      background: var(--rb-accent-soft);
    }
  }
}