/* =========================================================================
   Blora Design 2.0 - Button component
   Spec §17.1: Native <button> with stable class, data-variant, data-size
   ========================================================================= */

.blora-button {
  --blora-button-bg: var(--blora-color-surface-default);
  --blora-button-fg: var(--blora-color-text-secondary);
  --blora-button-bd: var(--blora-color-border-subtle);

  /* Vertical size lives entirely in padding; line-height stays 1 so flex
     centers the glyph box (not a tall line-box with ink stuck near the top —
     the usual mobile CJK “text too high” failure mode).
     pad-y = 0.75em keeps total height ≈ old 0.55em + line-height 1.4. */
  --blora-button-pad-y: 0.75em;
  --blora-button-pad-x: 1.1em;
  --blora-button-height: calc(1em + 2 * var(--blora-button-pad-y) + 2px);

  /* `auto` honors SVG width/height attributes (createBloraIcon). Components
     override this token for circular / chrome controls. Do not default to 1em
     — that crushed navbar, speed-dial, and other intended rem/px icons. */
  --blora-button-icon-size: auto;
  --blora-button-radius: var(--blora-radius-lg);
  --blora-button-corner: superellipse(1.2);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--blora-space-2);
  box-sizing: border-box;

  /* Never stretch to fill a grid/flex track — that produced "exploded" tall
     pills (e.g. sidebar toggle in a min-height layout). Grow only when the
     consumer sets width/flex explicitly (dialog footer full-width).
     Floor the inline size at the content-box height so an icon-only control
     can collapse to a square, never a vertical rectangle.
     Height is a closed box: pad-y + 1em type + 1px border × 2. Children
     (icons, images, custom nodes) cannot raise it — max-height locks the
     used size, min-height: 0 defeats flex-item min-height: auto. */
  width: max-content;
  min-inline-size: var(--blora-button-height);
  max-width: 100%;
  height: var(--blora-button-height);
  min-height: 0;
  max-height: var(--blora-button-height);
  align-self: flex-start;
  flex: 0 0 auto;
  padding: var(--blora-button-pad-y) var(--blora-button-pad-x);
  font-family: var(--blora-font-sans);
  font-size: var(--blora-text-sm);
  font-weight: 500;
  line-height: 1;

  /*
   * Standard CSS (not UA-sniff): trim half-leading so flex centers ink metrics,
   * not the full em-box. Fixes real-device system fonts (PingFang / Noto / SF)
   * sitting high while desktop emulation (often different fonts) looks fine.
   * Chrome 133+, Safari 18.2+, Edge 133+ — ignored elsewhere, flex+lh1 remains.
   */
  text-box: trim-both cap alphabetic;
  text-box-trim: trim-both;
  text-box-edge: cap alphabetic;
  writing-mode: horizontal-tb;
  color: var(--blora-button-fg);
  background: var(--blora-button-bg);
  border: 1px solid var(--blora-button-bd);
  border-radius: var(--blora-button-radius);
  cursor: pointer;
  white-space: nowrap;
  transition:
    background var(--blora-duration-base) var(--blora-easing-standard),
    border-color var(--blora-duration-base) var(--blora-easing-standard),
    box-shadow var(--blora-duration-base) var(--blora-easing-standard),
    transform var(--blora-duration-fast) var(--blora-easing-standard);
  position: relative;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* Buttons keep the v1 external focus treatment. They are not clipped
   navigation items and must not inherit the foundation's inset fallback. */
.blora-button:focus-visible {
  outline: var(--blora-focus-ring-width) solid var(--blora-color-action-primary-default);
  outline-offset: var(--blora-focus-ring-offset);
}

/* Opt-in block / full-row button */
.blora-button[data-block],
.blora-button[data-full-width] {
  width: 100%;
  align-self: stretch;
}

.blora-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--blora-shadow-2);
}

.blora-button:active {
  transform: translateY(0);
  box-shadow: var(--blora-shadow-1);
}

.blora-button:disabled,
.blora-button[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* -- Primary variant -- */
.blora-button[data-variant="primary"] {
  --blora-button-bg: var(--blora-color-action-primary-default);
  --blora-button-fg: var(--blora-color-text-on-accent);
  --blora-button-bd: var(--blora-color-action-primary-default);

  font-weight: 600;
  box-shadow: var(--blora-shadow-primary);
}

.blora-button[data-variant="primary"]:hover {
  --blora-button-bg: var(--blora-color-action-primary-hover);
  --blora-button-bd: var(--blora-color-action-primary-hover);
}

/* -- Secondary variant (default) -- */
.blora-button[data-variant="secondary"] {
  --blora-button-bg: var(--blora-color-text-secondary);
  --blora-button-fg: var(--blora-color-text-on-accent);
  --blora-button-bd: var(--blora-color-text-secondary);

  font-weight: 600;
}

.blora-button[data-variant="secondary"]:hover {
  --blora-button-bg: var(--blora-color-text-primary);
  --blora-button-bd: var(--blora-color-text-primary);
}

/* -- Danger variant -- */
.blora-button[data-variant="danger"] {
  --blora-button-bg: var(--blora-color-status-danger);
  --blora-button-fg: var(--blora-color-text-on-accent);
  --blora-button-bd: var(--blora-color-status-danger);

  font-weight: 600;
}

.blora-button[data-variant="danger"]:hover {
  --blora-button-bg: color-mix(
    in srgb,
    var(--blora-color-status-danger) 85%,
    var(--blora-color-text-primary)
  );
  --blora-button-bd: color-mix(
    in srgb,
    var(--blora-color-status-danger) 85%,
    var(--blora-color-text-primary)
  );
}

/* -- Ghost variant -- */
.blora-button[data-variant="ghost"] {
  --blora-button-bg: transparent;
  --blora-button-bd: transparent;
}

.blora-button[data-variant="ghost"]:hover {
  --blora-button-bg: var(--blora-color-surface-raised);

  box-shadow: none;
  transform: none;
}

/* -- Outline variant -- */
.blora-button[data-variant="outline"] {
  --blora-button-bg: transparent;
  --blora-button-bd: var(--blora-color-text-subtle);
}

.blora-button[data-variant="outline"]:hover {
  --blora-button-bd: var(--blora-color-text-emphasis);
  --blora-button-bg: var(--blora-color-surface-raised);
}

/* -- Text variant -- */
.blora-button[data-variant="text"] {
  --blora-button-bg: transparent;
  --blora-button-bd: transparent;
  --blora-button-pad-x: 0.4em;

  color: var(--blora-color-action-primary-default);
  padding: var(--blora-button-pad-y) var(--blora-button-pad-x);
}

.blora-button[data-variant="text"]:hover {
  color: var(--blora-color-action-primary-hover);
  background: none;
  box-shadow: none;
  transform: none;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* -- Sizes (pad-y compensated for line-height: 1 vs legacy 1.4) -- */
.blora-button[data-size="xs"] {
  --blora-button-pad-y: 0.5em;
  --blora-button-pad-x: 0.7em;

  font-size: var(--blora-text-xs);
  padding: var(--blora-button-pad-y) var(--blora-button-pad-x);
}

.blora-button[data-size="sm"] {
  --blora-button-pad-y: 0.6em;
  --blora-button-pad-x: 0.9em;

  font-size: var(--blora-text-sm);
  padding: var(--blora-button-pad-y) var(--blora-button-pad-x);
}

.blora-button[data-size="md"] {
  --blora-button-pad-y: 0.75em;
  --blora-button-pad-x: 1.1em;

  font-size: var(--blora-text-sm);
  padding: var(--blora-button-pad-y) var(--blora-button-pad-x);
}

.blora-button[data-size="lg"] {
  --blora-button-pad-y: 0.9em;
  --blora-button-pad-x: 1.4em;

  font-size: var(--blora-text-lg);
  padding: var(--blora-button-pad-y) var(--blora-button-pad-x);
}

.blora-button[data-size="xl"] {
  --blora-button-pad-y: 1em;
  --blora-button-pad-x: 1.6em;

  font-size: var(--blora-text-xl);
  padding: var(--blora-button-pad-y) var(--blora-button-pad-x);
  font-family: var(--blora-font-heading);
}

/* -- Icon-only button -- */
.blora-button[data-size="icon"] {
  --blora-button-pad-y: 0.75em;
  --blora-button-pad-x: 0.75em;
  --blora-button-radius: 50%;
  --blora-button-corner: round;
  --blora-button-icon-size: 1.125rem;

  padding: var(--blora-button-pad-y);
  aspect-ratio: 1;
  flex: none;
}

.blora-button[data-size="icon"][data-shape="square"] {
  --blora-button-radius: var(--blora-radius-lg);
  --blora-button-corner: superellipse(1.2);
}

.blora-button[data-size="icon"][data-shape="circle"] {
  --blora-button-radius: 50%;
  --blora-button-corner: round;
}

/* Height is already a closed box — children cannot raise it. Do not also
   clamp descendants to 1em: that is smaller than Lucide's 16–18px defaults
   and smaller than circular chrome (navbar, speed-dial, dock). */
.blora-button > * {
  flex: none;
}

.blora-button :is(svg, img, canvas, video, object, embed) {
  display: block;
  flex: none;
  inline-size: var(--blora-button-icon-size);
  block-size: var(--blora-button-icon-size);
  object-fit: contain;
}

/* -- Button group -- */
.blora-button-group {
  display: inline-flex;
  max-width: 100%;
  padding: calc(var(--blora-focus-ring-width) + var(--blora-focus-ring-offset));
  margin: calc(-1 * (var(--blora-focus-ring-width) + var(--blora-focus-ring-offset)));
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

/* Shared with .blora-join: weld adjacent controls, lift on focus */
.blora-button-group > .blora-button,
.blora-join > .blora-button {
  border-radius: 0;
  margin-inline-start: -1px;
  align-self: stretch;
  height: auto;
  min-height: var(--blora-join-height, var(--blora-button-height));
  max-height: none;
}

.blora-button-group > .blora-button:first-child,
.blora-join > .blora-button:first-child {
  margin-inline-start: 0;
  border-start-start-radius: var(--blora-button-radius);
  border-end-start-radius: var(--blora-button-radius);
}

.blora-button-group > .blora-button:last-child,
.blora-join > .blora-button:last-child {
  border-start-end-radius: var(--blora-button-radius);
  border-end-end-radius: var(--blora-button-radius);
}

.blora-button-group > .blora-button:only-child,
.blora-join > .blora-button:only-child {
  border-radius: var(--blora-button-radius);
}

.blora-join[data-orientation="vertical"] > .blora-button {
  margin-inline-start: 0;
  margin-block-start: -1px;
}

.blora-join[data-orientation="vertical"] > .blora-button:first-child {
  margin-block-start: 0;
  border-radius: var(--blora-button-radius) var(--blora-button-radius) 0 0;
}

.blora-join[data-orientation="vertical"] > .blora-button:last-child {
  border-radius: 0 0 var(--blora-button-radius) var(--blora-button-radius);
}

.blora-join[data-orientation="vertical"] > .blora-button:only-child {
  border-radius: var(--blora-button-radius);
}

@supports (corner-shape: superellipse(1.2)) {
  .blora-button {
    corner-shape: var(--blora-button-corner);
  }

  .blora-button-group > .blora-button,
  .blora-join > .blora-button {
    corner-shape: square;
  }

  .blora-button-group > .blora-button:first-child,
  .blora-join > .blora-button:first-child {
    corner-shape: var(--blora-button-corner) square square var(--blora-button-corner);
  }

  .blora-button-group > .blora-button:last-child,
  .blora-join > .blora-button:last-child {
    corner-shape: square var(--blora-button-corner) var(--blora-button-corner) square;
  }

  .blora-button-group > .blora-button:only-child,
  .blora-join > .blora-button:only-child {
    corner-shape: var(--blora-button-corner);
  }

  .blora-join[data-orientation="vertical"] > .blora-button:first-child {
    corner-shape: var(--blora-button-corner) var(--blora-button-corner) square square;
  }

  .blora-join[data-orientation="vertical"] > .blora-button:last-child {
    corner-shape: square square var(--blora-button-corner) var(--blora-button-corner);
  }
}

.blora-button-group > .blora-button:hover,
.blora-button-group > .blora-button:active,
.blora-join > .blora-button:hover,
.blora-join > .blora-button:active {
  transform: none;
  box-shadow: none;
}

.blora-button-group > .blora-button:focus-visible,
.blora-join > .blora-button:focus-visible {
  z-index: var(--blora-z-sticky);
}

/* -- Loading state (§17.1: aria-busy + data-loading) -- */
.blora-button[data-loading] {
  pointer-events: none;
}

.blora-button[data-loading]::before {
  content: "";
  width: 1em;
  height: 1em;
  flex: none;
  border: 2px solid currentcolor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: blora-button-spin 0.7s linear infinite;
}

.blora-button[data-loading][data-size="icon"] > svg {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

@keyframes blora-button-spin {
  to {
    transform: rotate(360deg);
  }
}

/* -- Loading in reduced motion -- */
@media (prefers-reduced-motion: reduce) {
  .blora-button[data-loading]::before {
    animation-duration: 1.5s;
  }
}

/* -- FAB (Floating Action Button) -- */
.blora-fab {
  position: fixed;
  inset-inline-end: max(var(--blora-space-5), env(safe-area-inset-inline-end, 0px));
  bottom: max(var(--blora-space-5), env(safe-area-inset-bottom, 0px));
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--blora-color-action-primary-default);
  color: var(--blora-color-text-on-accent);
  display: grid;
  place-items: center;
  border: none;
  cursor: pointer;
  box-shadow: var(--blora-shadow-4), var(--blora-shadow-primary);
  z-index: var(--blora-z-sticky);
  transition:
    transform var(--blora-duration-base) var(--blora-easing-overshoot),
    opacity var(--blora-duration-base) var(--blora-easing-standard);
}

.blora-fab:hover {
  transform: scale(1.12);
}

.blora-fab[data-variant="surface"] {
  background: var(--blora-color-surface-default);
  color: var(--blora-color-text-primary);
  border: 1px solid var(--blora-color-border-subtle);
  box-shadow: var(--blora-shadow-3);
}

.blora-fab[data-hidden] {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.86);
}

/* Static FAB for docs/preview */
.blora-fab--static {
  position: relative;
  inset: auto;
  z-index: auto;
  flex: none;
}

.blora-fab--static[data-hidden] {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

@media (max-width: 560px) {
  .blora-fab:not(.blora-fab--static) {
    inset-inline-end: max(var(--blora-space-4), env(safe-area-inset-inline-end, 0px));
    bottom: max(var(--blora-space-4), env(safe-area-inset-bottom, 0px));
    width: 3rem;
    height: 3rem;
  }
}