/* ============================================================================
   BUTTON  -  figma frame 14:487 (Variant x Size x State)
   ----------------------------------------------------------------------------
   Only TIER-2 semantic tokens are referenced here. The `--sh-btn-*` custom
   properties are component-local plumbing: each variant block binds them to a
   tier-2 token once, and the state rules below read them, so the whole 5x3x3
   matrix is expressed as five small blocks instead of forty-five selectors.

   Everything lives in @layer components so a Tailwind utility passed through
   `className` (`w-full`, `mt-lg`, `text-text-secondary`, ...) still wins.
   The layer statement is a defensive no-op when app.css has already declared
   the same order, and makes this file correct on its own if it ever loads first.

   HEIGHTS. Figma draws the stroke *inside* the frame, so a Secondary button is
   the same height as a Primary one. Borders are therefore subtracted from the
   padding, which lands every size on its designed box:
     sm  6.5*2 + 20 + 1.5*2 = 36    md  10.5*2 + 24 + 1.5*2 = 48
     lg 10.5*2 + 28 + 1.5*2 = 52
   The 20/24/28 line-heights come from the type role the component puts on the
   element (body-sm-bold / body-md-bold / body-lg-bold).

   DEVIATIONS FROM FIGMA, deliberate:
   * Focus-visible is not drawn in Figma at all. WCAG 2.4.7 requires it, so the
     semantic focus ring is applied here; filled variants switch to the inverse
     ring colour because a green ring on a green fill is invisible.
   * "Ghost / Large / Default" is the one cell in the matrix with no padding
     while its own Hover and Disabled cells have it - an authoring slip that
     would make the button jump on hover. Padding is kept on all ghost states.
   * Disabled uses the opaque `-bg-disabled` / `-fg-disabled` tokens rather than
     Figma's 40% opacity, so the page never shows through a disabled control.
     `--control-opacity-disabled` still holds the 0.4 if that is ever wanted.
   ========================================================================= */

@layer theme, base, components, utilities;

@layer components {
  /* ---------------------------------------------------------------------
     Base - shared by every variant and size.
     A one-cell grid stacks the label and the loading spinner without either
     transforms or absolute offsets, so it stays correct under dir="rtl".
     ------------------------------------------------------------------ */
  .sh-btn {
    display: inline-grid;
    grid-template-areas: "sh-btn-stack";
    place-items: center;
    border-style: solid;
    border-width: var(--control-border-width);
    border-radius: var(--radius-control);
    background-color: var(--sh-btn-bg);
    color: var(--sh-btn-fg);
    border-color: var(--sh-btn-border);
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    transition:
      background-color var(--motion-duration-fast) var(--motion-ease-standard),
      border-color var(--motion-duration-fast) var(--motion-ease-standard),
      color var(--motion-duration-fast) var(--motion-ease-standard),
      transform var(--motion-duration-base) var(--motion-ease-entrance);
  }

  /* The Claude Design drafts lift a button 3px under the pointer and set it
     back down on press. Pointer devices only - a touch "hover" would leave the
     control raised after the tap - and never while disabled or busy, where the
     control must not look live. app.css collapses the transition under
     prefers-reduced-motion, so the lift becomes an instant, harmless offset.

     The drafts also put a coloured glow behind the lifted button; that is
     deliberately not shipped (client decision). */
  @media (hover: hover) {
    .sh-btn:hover:not(:disabled):not([aria-disabled="true"]):not([data-loading]) {
      transform: translateY(-3px);
    }
  }

  .sh-btn:active:not(:disabled):not([aria-disabled="true"]):not([data-loading]) {
    transform: none;
  }

  .sh-btn--block {
    display: grid;
    inline-size: 100%;
  }

  .sh-btn__content {
    grid-area: sh-btn-stack;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--control-gap);
    transition: opacity var(--motion-duration-fast) var(--motion-ease-standard);
  }

  /* The 24px box the icon is drawn inside in Figma. Kept on the slot rather
     than on the icon so a consumer's own glyph inherits the same geometry. */
  .sh-btn__icon {
    display: inline-flex;
    flex: none;
    align-items: center;
    justify-content: center;
    inline-size: var(--control-icon-size);
    block-size: var(--control-icon-size);
  }

  /* ---------------------------------------------------------------------
     Sizes - Figma: sm 16/8 (space.md/space.xs), md + lg 24/12 (space.lg/sm)
     ------------------------------------------------------------------ */
  .sh-btn[data-size="sm"] {
    padding-inline: calc(var(--control-padding-inline-sm) - var(--control-border-width));
    padding-block: calc(var(--control-padding-block-sm) - var(--control-border-width));
  }

  .sh-btn[data-size="md"] {
    padding-inline: calc(var(--control-padding-inline-md) - var(--control-border-width));
    padding-block: calc(var(--control-padding-block-md) - var(--control-border-width));
  }

  .sh-btn[data-size="lg"] {
    padding-inline: calc(var(--control-padding-inline-lg) - var(--control-border-width));
    padding-block: calc(var(--control-padding-block-lg) - var(--control-border-width));
  }

  /* ---------------------------------------------------------------------
     Variants - the only place a token name appears twice.
     ------------------------------------------------------------------ */
  .sh-btn[data-variant="primary"] {
    --sh-btn-bg: var(--interactive-primary-bg);
    --sh-btn-bg-hover: var(--interactive-primary-bg-hover);
    --sh-btn-bg-active: var(--interactive-primary-bg-active);
    --sh-btn-bg-disabled: var(--interactive-primary-bg-disabled);
    --sh-btn-fg: var(--interactive-primary-fg);
    --sh-btn-fg-hover: var(--interactive-primary-fg-hover);
    --sh-btn-fg-disabled: var(--interactive-primary-fg-disabled);
    --sh-btn-border: var(--interactive-primary-border);
    --sh-btn-border-hover: var(--interactive-primary-border-hover);
    --sh-btn-border-disabled: var(--interactive-primary-border-disabled);
  }

  .sh-btn[data-variant="secondary"] {
    --sh-btn-bg: var(--interactive-secondary-bg);
    --sh-btn-bg-hover: var(--interactive-secondary-bg-hover);
    --sh-btn-bg-active: var(--interactive-secondary-bg-active);
    --sh-btn-bg-disabled: var(--interactive-secondary-bg-disabled);
    --sh-btn-fg: var(--interactive-secondary-fg);
    --sh-btn-fg-hover: var(--interactive-secondary-fg-hover);
    --sh-btn-fg-disabled: var(--interactive-secondary-fg-disabled);
    --sh-btn-border: var(--interactive-secondary-border);
    --sh-btn-border-hover: var(--interactive-secondary-border-hover);
    --sh-btn-border-disabled: var(--interactive-secondary-border-disabled);
  }

  .sh-btn[data-variant="dark"] {
    --sh-btn-bg: var(--interactive-dark-bg);
    --sh-btn-bg-hover: var(--interactive-dark-bg-hover);
    --sh-btn-bg-active: var(--interactive-dark-bg-active);
    --sh-btn-bg-disabled: var(--interactive-dark-bg-disabled);
    --sh-btn-fg: var(--interactive-dark-fg);
    --sh-btn-fg-hover: var(--interactive-dark-fg-hover);
    --sh-btn-fg-disabled: var(--interactive-dark-fg-disabled);
    --sh-btn-border: var(--interactive-dark-border);
    --sh-btn-border-hover: var(--interactive-dark-border-hover);
    --sh-btn-border-disabled: var(--interactive-dark-border-disabled);
  }

  .sh-btn[data-variant="danger"] {
    --sh-btn-bg: var(--interactive-danger-bg);
    --sh-btn-bg-hover: var(--interactive-danger-bg-hover);
    --sh-btn-bg-active: var(--interactive-danger-bg-active);
    --sh-btn-bg-disabled: var(--interactive-danger-bg-disabled);
    --sh-btn-fg: var(--interactive-danger-fg);
    --sh-btn-fg-hover: var(--interactive-danger-fg-hover);
    --sh-btn-fg-disabled: var(--interactive-danger-fg-disabled);
    --sh-btn-border: var(--interactive-danger-border);
    --sh-btn-border-hover: var(--interactive-danger-border-hover);
    --sh-btn-border-disabled: var(--interactive-danger-border-disabled);
  }

  .sh-btn[data-variant="ghost"] {
    --sh-btn-bg: var(--interactive-ghost-bg);
    --sh-btn-bg-hover: var(--interactive-ghost-bg-hover);
    --sh-btn-bg-active: var(--interactive-ghost-bg-active);
    --sh-btn-bg-disabled: var(--interactive-ghost-bg-disabled);
    --sh-btn-fg: var(--interactive-ghost-fg);
    --sh-btn-fg-hover: var(--interactive-ghost-fg-hover);
    --sh-btn-fg-disabled: var(--interactive-ghost-fg-disabled);
    --sh-btn-border: var(--interactive-ghost-border);
    --sh-btn-border-hover: var(--interactive-ghost-border-hover);
    --sh-btn-border-disabled: var(--interactive-ghost-border-disabled);
  }

  /* Figma gives the ghost md/lg cells radius.md while every other cell uses
     radius.sm - reproduced rather than normalised. */
  .sh-btn[data-variant="ghost"][data-size="md"],
  .sh-btn[data-variant="ghost"][data-size="lg"] {
    border-radius: var(--radius-control-lg);
  }

  /* ---------------------------------------------------------------------
     States
     ------------------------------------------------------------------ */
  @media (hover: hover) {
    .sh-btn:hover:not(:disabled, [aria-disabled="true"]) {
      background-color: var(--sh-btn-bg-hover);
      color: var(--sh-btn-fg-hover);
      border-color: var(--sh-btn-border-hover);
    }
  }

  /* No `-fg-active` / `-border-active` exists in the token contract, so the
     pressed state deepens the fill only. */
  .sh-btn:active:not(:disabled, [aria-disabled="true"]) {
    background-color: var(--sh-btn-bg-active);
  }

  .sh-btn:focus-visible {
    outline: var(--focus-ring-width) solid var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
  }

  /* A green ring on a green (or red, or near-black) fill reads as nothing. */
  .sh-btn[data-variant="primary"]:focus-visible,
  .sh-btn[data-variant="danger"]:focus-visible,
  .sh-btn[data-variant="dark"]:focus-visible {
    outline-color: var(--focus-ring-color-inverse);
  }

  .sh-btn:disabled,
  .sh-btn[aria-disabled="true"] {
    background-color: var(--sh-btn-bg-disabled);
    color: var(--sh-btn-fg-disabled);
    border-color: var(--sh-btn-border-disabled);
    cursor: not-allowed;
  }

  /* ---------------------------------------------------------------------
     Loading - the label keeps its box (no reflow) and stays in the
     accessibility tree, which `visibility: hidden` would not allow.
     ------------------------------------------------------------------ */
  .sh-btn[data-loading="true"] {
    cursor: progress;
  }

  .sh-btn[data-loading="true"] .sh-btn__content {
    opacity: 0;
  }

  .sh-btn__spinner {
    grid-area: sh-btn-stack;
    inline-size: 1em;
    block-size: 1em;
    border: var(--control-border-width) solid currentColor;
    border-block-start-color: transparent;
    border-radius: var(--radius-pill);
    /* The contract publishes fast/base/slow only; two slows is the ~640ms a
       spinner wants without inventing a duration token. */
    animation: sh-btn-spin calc(var(--motion-duration-slow) * 2) linear infinite;
  }
}

@keyframes sh-btn-spin {
  to {
    rotate: 1turn;
  }
}