/**
 * Buttons — Sistema Global de Botões
 * Fonte única de verdade para todos os botões do app.
 * Incluir após toast.css em todas as páginas.
 */

.btn {
  height: 36px;
  padding: 0 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  transition: background .15s, color .15s, border-color .15s, opacity .15s;
}

.btn:disabled,
.btn.loading {
  opacity: .55;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Tipos ── */

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0c0c10;
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--bg-overlay);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--bg-overlay);
  color: var(--text);
}

.btn-destructive {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 25%, transparent);
}
.btn-destructive:hover:not(:disabled) {
  background: color-mix(in srgb, var(--danger) 20%, transparent);
}

/* ── Tamanhos ── */

.btn-sm {
  height: 30px;
  padding: 0 12px;
  font-size: 12px;
}

.btn-lg {
  height: 42px;
  padding: 0 22px;
  font-size: 14px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
}

.btn-icon.btn-sm {
  width: 30px;
  height: 30px;
}

/* ── Loading state ── */

.btn.loading::before {
  content: '';
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: btn-spin .6s linear infinite;
}

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