/* ============================================================
   SAE-CL Components — Buttons
   Clases sae-btn-* para no conflictar con Bootstrap btn-*
   ============================================================ */

.sae-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  line-height: 1.4;
}

/* ── Principal ─────────────────────────────────────────────── */
.sae-btn--primary {
  background: var(--accent-primary);
  color: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,0.2), var(--shadow-glow-primary);
}

.sae-btn--primary:hover {
  background: var(--accent-primary-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35), var(--shadow-glow-primary);
}

.sae-btn--primary:active {
  transform: translateY(0);
}

/* Shimmer en hover */
.sae-btn--primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.18), transparent);
  transition: left 500ms;
  pointer-events: none;
}

.sae-btn--primary:hover::after {
  left: 100%;
}

/* ── Secundario ─────────────────────────────────────────────── */
.sae-btn--secondary {
  background: var(--surface-elevated-2);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.sae-btn--secondary:hover {
  background: var(--surface-elevated-3);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.12);
}

/* ── Ghost ──────────────────────────────────────────────────── */
.sae-btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.sae-btn--ghost:hover {
  color: var(--text-primary);
  background: var(--surface-elevated-1);
}

/* ── Tamaños ────────────────────────────────────────────────── */
.sae-btn--sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.sae-btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

/* ── Estado loading (CSS puro, sin JS extra) ────────────────── */
.sae-btn.is-loading {
  pointer-events: none;
  opacity: 0.75;
}

.sae-btn.is-loading .sae-btn__text {
  opacity: 0;
}

.sae-btn.is-loading::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: sae-spin 600ms linear infinite;
}

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