/* Steps pure CSS styling following pattern/Button.css architecture
   - Local CSS variables (--r-steps-*) declared on the list; steps inherit them
   - Each step maps its status to --r-step-* locals
   - Modifier classes rebind local variables
   - Component styles strictly consume local variables
   A step is its marker and text (`__main`) followed by the connector to the
   next step: across in a row, down in a column.
*/

/* ─────────────────────────────────────────────────────────────────────────
   1. Local Variable Definitions & Modifier Overrides
   ───────────────────────────────────────────────────────────────────────── */

.r-steps {
  /* The Design System's marks: 20px squares with the number in Space Mono,
     joined by a short seam line. Upcoming is a seam outline on the surface,
     the current step a yellow sticker (ink edge, ink number), a finished step
     solid ink with a paper check. A failed step is a problem, so it is the
     orange sticker. One size: `sm` keeps the marks. */
  --r-steps-indicator-size: 20px;
  --r-steps-indicator-font-size: 12px;
  --r-steps-icon-size: 14px;
  --r-steps-title-font-size: 13px;
  --r-steps-description-font-size: 12px;
  --r-steps-line-height: calc(18 / 13);
  --r-steps-gap: 8px;
  --r-steps-connector-gap: 8px;
  --r-steps-connector-min-width: 16px;
  --r-steps-vertical-item-gap: 16px;
  --r-steps-indicator-font-family: var(--font-mono);
  --r-steps-indicator-font-weight: 700;
  --r-steps-indicator-border-width: 1px;
  --r-steps-indicator-radius: var(--radius-sticker, 4px);
  --r-steps-title-font-family: var(--font-sans);
  --r-steps-title-font-weight: 600;
  --r-steps-connector-width: 1px;
  --r-steps-connector-color: var(--line-seam);
  --r-steps-connector-color-finish: var(--line-seam);
  --r-steps-focus-radius: var(--radius-sticker, 4px);
  --r-steps-focus-outline: 2px solid var(--line-strong);
  --r-steps-duration: 160ms;
  --r-steps-easing: ease-out;

  --r-steps-indicator-color-wait: var(--layer-card);
  --r-steps-indicator-color-process: var(--primary-400);
  --r-steps-indicator-color-finish: var(--foreground);
  --r-steps-indicator-color-error: var(--warning);
  --r-steps-indicator-border-color-wait: var(--line-seam);
  --r-steps-indicator-border-color-process: var(--sticker-ink);
  --r-steps-indicator-border-color-finish: var(--foreground);
  --r-steps-indicator-border-color-error: var(--sticker-ink);
  --r-steps-indicator-border-color-hover: var(--line-strong);
  --r-steps-indicator-text-color-wait: var(--foreground-hint);
  --r-steps-indicator-text-color-process: var(--sticker-ink);
  --r-steps-indicator-text-color-finish: var(--layer-canvas);
  --r-steps-indicator-text-color-error: var(--sticker-ink);
  --r-steps-indicator-shadow-process: none;
  --r-steps-indicator-shadow-hover: none;
  --r-steps-title-color-wait: var(--foreground-hint);
  --r-steps-title-color-process: var(--foreground);
  --r-steps-title-color-finish: var(--foreground-muted);
  --r-steps-title-color-error: var(--foreground);
  --r-steps-title-color-hover: var(--foreground);
  --r-steps-title-color-disabled: var(--foreground-disabled);
}

.r-step {
  /* `wait`: ahead of the current step. */
  --r-step-indicator-color: var(--r-steps-indicator-color-wait);
  --r-step-indicator-border-color: var(--r-steps-indicator-border-color-wait);
  --r-step-indicator-text-color: var(--r-steps-indicator-text-color-wait);
  --r-step-indicator-shadow: none;
  --r-step-title-color: var(--r-steps-title-color-wait);
  --r-step-description-color: var(--foreground-hint);
  --r-step-connector-color: var(--r-steps-connector-color);

  &.r-step--process {
    --r-step-indicator-color: var(--r-steps-indicator-color-process);
    --r-step-indicator-border-color: var(--r-steps-indicator-border-color-process);
    --r-step-indicator-text-color: var(--r-steps-indicator-text-color-process);
    --r-step-indicator-shadow: var(--r-steps-indicator-shadow-process);
    --r-step-title-color: var(--r-steps-title-color-process);
    --r-step-description-color: var(--foreground-muted);
  }
  &.r-step--finish {
    --r-step-indicator-color: var(--r-steps-indicator-color-finish);
    --r-step-indicator-border-color: var(--r-steps-indicator-border-color-finish);
    --r-step-indicator-text-color: var(--r-steps-indicator-text-color-finish);
    --r-step-title-color: var(--r-steps-title-color-finish);
    --r-step-connector-color: var(--r-steps-connector-color-finish);
  }
  &.r-step--error {
    --r-step-indicator-color: var(--r-steps-indicator-color-error);
    --r-step-indicator-border-color: var(--r-steps-indicator-border-color-error);
    --r-step-indicator-text-color: var(--r-steps-indicator-text-color-error);
    --r-step-title-color: var(--r-steps-title-color-error);
    --r-step-description-color: var(--foreground-muted);
  }
  /* A clickable step under the pointer: the title takes the hover color, a
     waiting marker its hover border, and a settled marker the hover shadow. */
  @media (hover: hover) {
    &.r-step--clickable:hover {
      --r-step-title-color: var(--r-steps-title-color-hover);
    }
    &.r-step--clickable.r-step--wait:hover {
      --r-step-indicator-border-color: var(--r-steps-indicator-border-color-hover);
    }
    &.r-step--clickable:not(.r-step--process):hover {
      --r-step-indicator-shadow: var(--r-steps-indicator-shadow-hover);
    }
  }
  &.r-step--disabled {
    --r-step-title-color: var(--r-steps-title-color-disabled);
  }
}

/* Stickers take the 1.5px ink edge; only the upcoming outline stays a 1px seam. */
.r-steps > .r-step:is(.r-step--process, .r-step--finish, .r-step--error) {
  --r-steps-indicator-border-width: 1.5px;
}

/* ─────────────────────────────────────────────────────────────────────────
   2. Component Styles
   ───────────────────────────────────────────────────────────────────────── */

.r-steps {
  display: flex;
  line-height: var(--r-steps-line-height);
  list-style: none;
  margin: 0;
  padding: 0;
}

.r-step {
  display: flex;
  margin: 0;
  min-width: 0;
  padding: 0;
  position: relative;
}

/* The marker and the text; the hit area of a clickable step is drawn over it. */
.r-step__main {
  display: flex;
  gap: var(--r-steps-gap);
  position: relative;
}

.r-step__indicator {
  align-items: center;
  background: var(--r-step-indicator-color);
  border: var(--r-steps-indicator-border-width) solid var(--r-step-indicator-border-color);
  border-radius: var(--r-steps-indicator-radius);
  box-shadow: var(--r-step-indicator-shadow);
  box-sizing: border-box;
  color: var(--r-step-indicator-text-color);
  display: flex;
  flex: none;
  font-family: var(--r-steps-indicator-font-family);
  font-size: var(--r-steps-indicator-font-size);
  font-variant-numeric: tabular-nums;
  font-weight: var(--r-steps-indicator-font-weight);
  height: var(--r-steps-indicator-size);
  justify-content: center;
  line-height: 1;
  transition:
    background-color var(--r-steps-duration) var(--r-steps-easing),
    border-color var(--r-steps-duration) var(--r-steps-easing),
    box-shadow var(--r-steps-duration) var(--r-steps-easing),
    color var(--r-steps-duration) var(--r-steps-easing);
  width: var(--r-steps-indicator-size);

  & > svg {
    flex: none;
    height: var(--r-steps-icon-size);
    width: var(--r-steps-icon-size);
  }
}

/* The title's first line is centered on the marker. */
.r-step__content {
  min-width: 0;
  padding-top: calc(
    (var(--r-steps-indicator-size) - var(--r-steps-title-font-size) * var(--r-steps-line-height)) /
      2
  );
}

.r-step__title {
  color: var(--r-step-title-color);
  display: block;
  font-family: var(--r-steps-title-font-family);
  font-size: var(--r-steps-title-font-size);
  font-weight: var(--r-steps-title-font-weight);
  transition: color var(--r-steps-duration) var(--r-steps-easing);
  white-space: nowrap;
}

.r-step__description {
  color: var(--r-step-description-color);
  font-size: var(--r-steps-description-font-size);
  margin-top: 2px;
}

/* Read out after the title: the marker's check or cross says it only by look. */
.r-step__status {
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

/* A clickable step's title is a button whose hit area (`::after`) stretches
   over the marker and the description; the focus ring is drawn around it. */
.r-step__button {
  appearance: none;
  background: none;
  border: 0;
  cursor: pointer;
  line-height: inherit;
  margin: 0;
  padding: 0;
  text-align: start;

  &::after {
    border-radius: var(--r-steps-focus-radius);
    content: "";
    inset: -4px;
    position: absolute;
  }
  &:focus-visible {
    outline: none;
  }
  &:focus-visible::after {
    outline: var(--r-steps-focus-outline);
  }
  &:disabled {
    cursor: not-allowed;
  }
}

.r-step__connector {
  border-color: var(--r-step-connector-color);
  border-style: solid;
  border-width: 0;
  transition: border-color var(--r-steps-duration) var(--r-steps-easing);
}

.r-step:last-child > .r-step__connector {
  display: none;
}

/* A row, as the Design System's steps: the title sits beside its marker and
   the connector, a 16px seam line, follows the title on the same line into
   the next step; the description goes on the line below, under the title and
   the connector. The steps keep their own width and the row wraps. */
.r-steps--horizontal > .r-step {
  align-content: start;
  display: grid;
  flex: none;
  /* The connector's column holds its line and the gap on each side. */
  grid-template-columns:
    var(--r-steps-indicator-size) auto
    calc(var(--r-steps-connector-min-width) + 2 * var(--r-steps-connector-gap));

  &:last-child {
    grid-template-columns: var(--r-steps-indicator-size) auto;
  }
  & > .r-step__main,
  & > .r-step__main > .r-step__content {
    display: contents;
  }
  & > .r-step__main > .r-step__indicator {
    grid-column: 1;
    grid-row: 1;
  }
  & > .r-step__main > .r-step__content > .r-step__title {
    align-self: center;
    grid-column: 2;
    grid-row: 1;
    margin-inline-start: var(--r-steps-gap);
  }
  & > .r-step__main > .r-step__content > .r-step__description {
    grid-column: 2 / -1;
    grid-row: 2;
    margin-inline-start: var(--r-steps-gap);
  }
  & > .r-step__connector {
    align-self: center;
    border-top-width: var(--r-steps-connector-width);
    grid-column: 3;
    grid-row: 1;
    margin-inline: var(--r-steps-connector-gap);
  }
}

@media (width >= 40rem) {
  .r-steps--horizontal {
    flex-wrap: wrap;
    row-gap: 8px;
  }
}

/* Narrow screens: a row of titles beside their markers overflows a phone, so
   the steps share the width and each stacks its text under the marker, the
   titles wrapping. The marker and the connector share the top line; the text
   spans the step below. */
@media (width < 40rem) {
  .r-steps--horizontal > .r-step {
    --r-steps-connector-gap: 6px;
    --r-steps-connector-min-width: 8px;
    flex: 1 1 0;
    grid-template-columns: var(--r-steps-indicator-size) minmax(0, 1fr);

    &:last-child {
      grid-template-columns: var(--r-steps-indicator-size) minmax(0, 1fr);
    }
    & > .r-step__main > .r-step__content {
      display: block;
      grid-column: 1 / -1;
      grid-row: 2;
      padding-inline-end: var(--r-steps-connector-gap);
      padding-top: 6px;
    }
    & > .r-step__main > .r-step__content > .r-step__title,
    & > .r-step__main > .r-step__content > .r-step__description {
      margin-inline-start: 0;
    }
    & > .r-step__main > .r-step__content > .r-step__title {
      overflow-wrap: anywhere;
      white-space: normal;
    }
    & > .r-step__connector {
      grid-column: 2;
    }
  }
}

/* A column: the connector runs down from under each marker to just above the next. */
.r-steps--vertical {
  flex-direction: column;
}

.r-steps--vertical > .r-step {
  padding-bottom: var(--r-steps-vertical-item-gap);

  &:last-child {
    padding-bottom: 0;
  }
  & > .r-step__connector {
    border-inline-start-width: var(--r-steps-connector-width);
    bottom: 4px;
    inset-inline-start: calc((var(--r-steps-indicator-size) - var(--r-steps-connector-width)) / 2);
    position: absolute;
    top: calc(var(--r-steps-indicator-size) + 4px);
  }
  & > .r-step__main > .r-step__content > .r-step__title {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .r-step__indicator,
  .r-step__title,
  .r-step__connector {
    transition: none;
  }
}