/* =============================================================================
 * SERIGRAPHIE-BOUTIQUE — Buttons v0.2.0
 * =============================================================================
 * Dépendance : tokens.css (charger avant)
 *
 * Variantes : primary, secondary, ghost, icon
 * Tailles : sm, md (default), lg
 * États : hover, active, focus, disabled
 *
 * Accessibilité :
 * - Focus ring visible au clavier (pas à la souris)
 * - Taille min 44x44px sur mobile (touch target)
 * - Disabled respecte aria-disabled + opacity
 * - Transitions respectent prefers-reduced-motion
 * ============================================================================= */

.sb-btn {
  /* Base — partagée par toutes les variantes */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sb-sp-2);
  padding: var(--sb-sp-3) var(--sb-sp-5);
  min-height: 44px;                   /* Touch target mobile */

  font-family: var(--sb-font-sans);
  font-size: var(--sb-fs-sm);
  font-weight: var(--sb-fw-medium);
  line-height: 1;
  letter-spacing: var(--sb-ls-normal);
  white-space: nowrap;
  text-decoration: none;
  text-align: center;

  border: 1.5px solid transparent;
  border-radius: var(--sb-radius-sm);
  cursor: pointer;
  user-select: none;

  transition:
    background-color var(--sb-duration-fast) var(--sb-ease-out),
    border-color var(--sb-duration-fast) var(--sb-ease-out),
    color var(--sb-duration-fast) var(--sb-ease-out),
    transform var(--sb-duration-fast) var(--sb-ease-out);
}

.sb-btn:focus-visible {
  outline: none;
  box-shadow: var(--sb-shadow-focus);
}

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

.sb-btn:active:not(:disabled) {
  transform: translateY(1px);
}

/* ---------------------------------------------------------------------------
 * Variante PRIMARY — CTA dominant (Orange sur Encre)
 * ------------------------------------------------------------------------- */
.sb-btn--primary {
  background-color: var(--sb-color-accent);
  color: var(--sb-text-on-accent);
  border-color: var(--sb-color-accent);
}

.sb-btn--primary:hover:not(:disabled) {
  background-color: var(--sb-color-accent-hover);
  border-color: var(--sb-color-accent-hover);
}

.sb-btn--primary:active:not(:disabled) {
  background-color: var(--sb-color-accent-darker);
  border-color: var(--sb-color-accent-darker);
}

/* ---------------------------------------------------------------------------
 * Variante SECONDARY — contour Encre, fond transparent
 * ------------------------------------------------------------------------- */
.sb-btn--secondary {
  background-color: transparent;
  color: var(--sb-text-primary);
  border-color: var(--sb-color-ink);
}

.sb-btn--secondary:hover:not(:disabled) {
  background-color: var(--sb-color-ink);
  color: var(--sb-text-on-ink);
}

/* ---------------------------------------------------------------------------
 * Variante GHOST — juste du texte, pas de bordure
 * ------------------------------------------------------------------------- */
.sb-btn--ghost {
  background-color: transparent;
  color: var(--sb-text-primary);
  border-color: transparent;
  padding-left: var(--sb-sp-3);
  padding-right: var(--sb-sp-3);
}

.sb-btn--ghost:hover:not(:disabled) {
  background-color: var(--sb-color-cendre-soft);
}

/* ---------------------------------------------------------------------------
 * Variante INVERTED — sur fond sombre (footer, hero sombre)
 * ------------------------------------------------------------------------- */
.sb-btn--inverted {
  background-color: var(--sb-color-paper);
  color: var(--sb-text-primary);
  border-color: var(--sb-color-paper);
}

.sb-btn--inverted:hover:not(:disabled) {
  background-color: var(--sb-color-accent);
  border-color: var(--sb-color-accent);
  color: var(--sb-text-on-accent);
}

/* ---------------------------------------------------------------------------
 * Variante DANGER — actions destructives (rare)
 * ------------------------------------------------------------------------- */
.sb-btn--danger {
  background-color: var(--sb-color-danger);
  color: var(--sb-color-paper);
  border-color: var(--sb-color-danger);
}

.sb-btn--danger:hover:not(:disabled) {
  filter: brightness(0.92);
}

/* ---------------------------------------------------------------------------
 * Tailles
 * ------------------------------------------------------------------------- */
.sb-btn--sm {
  padding: var(--sb-sp-2) var(--sb-sp-3);
  font-size: var(--sb-fs-xs);
  min-height: 32px;
}

.sb-btn--lg {
  padding: var(--sb-sp-4) var(--sb-sp-8);
  font-size: var(--sb-fs-base);
  min-height: 52px;
}

/* ---------------------------------------------------------------------------
 * Bouton icon-only — carré, pour icônes seules
 * ------------------------------------------------------------------------- */
.sb-btn--icon {
  padding: var(--sb-sp-3);
  min-width: 44px;
  width: 44px;
  aspect-ratio: 1;
}

.sb-btn--icon.sb-btn--sm {
  padding: var(--sb-sp-2);
  min-width: 32px;
  width: 32px;
}

/* Icône à l'intérieur d'un bouton — taille cohérente */
.sb-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.sb-btn--lg svg {
  width: 20px;
  height: 20px;
}

/* ---------------------------------------------------------------------------
 * Modifier : full-width (mobile, formulaires)
 * ------------------------------------------------------------------------- */
.sb-btn--block {
  display: flex;
  width: 100%;
}

/* ---------------------------------------------------------------------------
 * Reduced motion — pas de transform/transition
 * ------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .sb-btn {
    transition: none;
  }
  .sb-btn:active:not(:disabled) {
    transform: none;
  }
}