/* ============================================================
   button.css — design system v0 — composant button
   Owner: xilrian-agent (XA) · 2026-05-08
   ============================================================
   Variantes : .ds-button (primary par défaut), .ds-button--secondary,
   .ds-button--ghost. Tailles : .ds-button--sm, default, .ds-button--lg.
   ============================================================ */

.ds-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ds-space-2);
  padding: var(--ds-space-2) var(--ds-space-4);
  border: var(--ds-border-width-1) solid transparent;
  border-radius: var(--ds-radius-base);
  font-family: inherit;
  font-size: var(--ds-font-size-base);
  font-weight: var(--ds-font-weight-medium);
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--ds-transition-fast),
              border-color var(--ds-transition-fast),
              color var(--ds-transition-fast),
              transform var(--ds-transition-fast);
  user-select: none;
  white-space: nowrap;

  /* Primary par défaut — agents fournissent --surface-color-primary* */
  background-color: var(--surface-color-primary, #1a1a1a);
  color: var(--surface-color-primary-contrast, #fff);
  border-color: var(--surface-color-primary, #1a1a1a);
}

.ds-button:hover {
  background-color: var(--surface-color-primary-hover, var(--surface-color-primary, #333));
  border-color: var(--surface-color-primary-hover, var(--surface-color-primary, #333));
}

.ds-button:active {
  transform: translateY(1px);
}

.ds-button:disabled,
.ds-button[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ----- Variants ----- */
.ds-button--secondary {
  background-color: transparent;
  color: var(--surface-color-primary, #1a1a1a);
  border-color: var(--surface-color-primary, #1a1a1a);
}

.ds-button--secondary:hover {
  background-color: var(--surface-color-primary, #1a1a1a);
  color: var(--surface-color-primary-contrast, #fff);
}

.ds-button--ghost {
  background-color: transparent;
  color: var(--surface-color-text, currentColor);
  border-color: transparent;
}

.ds-button--ghost:hover {
  background-color: var(--surface-color-hover-bg, rgba(0, 0, 0, 0.06));
  border-color: transparent;
  color: var(--surface-color-text, currentColor);
}

/* ----- Sizes ----- */
.ds-button--sm {
  padding: var(--ds-space-1) var(--ds-space-3);
  font-size: var(--ds-font-size-sm);
}

.ds-button--lg {
  padding: var(--ds-space-3) var(--ds-space-5);
  font-size: var(--ds-font-size-lg);
}

/* ----- Modifiers ----- */
.ds-button--full-width {
  width: 100%;
}

.ds-button--icon-only {
  padding: var(--ds-space-2);
  aspect-ratio: 1;
}