/* ============================================================
   BUTTONS — Système de boutons unifié
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  min-height: 48px;
  user-select: none;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn:hover { text-decoration: none; }

.btn:focus-visible {
  outline: 3px solid var(--color-primary-600);
  outline-offset: 2px;
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

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

/* Primaire — vert institutionnel */
.btn-primary {
  background-color: var(--color-primary-600);
  color: var(--color-white);
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(0, 92, 46, 0.3);
}

/* Secondaire — contour vert */
.btn-secondary {
  background-color: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}
.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary-100);
}

/* Gold — CTA diplôme uniquement */
.btn-gold {
  background-color: var(--color-gold);
  color: var(--color-white);
}
.btn-gold:hover:not(:disabled) {
  background-color: #B8690E;
  box-shadow: 0 4px 14px rgba(212, 128, 26, 0.35);
}

/* Danger */
.btn-danger {
  background-color: var(--color-danger);
  color: var(--color-white);
}
.btn-danger:hover:not(:disabled) { background-color: #A93226; }

/* Ghost — neutre */
.btn-ghost {
  background-color: transparent;
  color: var(--color-neutral-600);
  border-color: var(--color-neutral-200);
}
.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-900);
}

/* Tailles */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
  min-height: 56px;
}

.btn-block { width: 100%; }

/* État chargement */
.btn.is-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}
.btn.is-loading::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: var(--color-white);
  border-radius: 50%;
  animation: btn-spin 0.65s linear infinite;
}
.btn.is-loading.btn-secondary::after,
.btn.is-loading.btn-ghost::after {
  border-color: rgba(0,0,0,0.15);
  border-top-color: var(--color-primary);
}

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