/* =========================================
   COMPONENT — Buttons
   ========================================= */

/* --- Base --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75em 1.5em;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  line-height: 1;
  white-space: nowrap;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color            var(--duration-fast) var(--ease-out),
    border-color     var(--duration-fast) var(--ease-out),
    box-shadow       var(--duration-fast) var(--ease-out),
    transform        var(--duration-fast) var(--ease-out),
    opacity          var(--duration-fast) var(--ease-out);
  user-select: none;
}

.btn:hover  { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* --- Variantes --- */
.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: 0 4px 16px rgba(193, 77, 74, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(193, 77, 74, 0.55);
}

.btn-secondary {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}

.btn-secondary:hover {
  background: var(--color-bg-card);
  border-color: var(--color-text-muted);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

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

.btn-warm {
  background: var(--gradient-warm);
  color: #1a0a00;
  font-weight: var(--weight-bold);
}

.btn-warm:hover {
  box-shadow: 0 6px 24px rgba(244, 196, 114, 0.4);
}

/* --- Tamanhos --- */
.btn-sm {
  padding: 0.5em 1em;
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 1em 2em;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn-xl {
  padding: 1.125em 2.5em;
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

/* --- Full width --- */
.btn-full { width: 100%; }

/* --- Pill --- */
.btn-pill { border-radius: var(--radius-full); }

/* --- Icon only --- */
.btn-icon {
  padding: 0.65em;
  aspect-ratio: 1;
}

/* --- Loading state --- */
.btn.is-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn.is-loading::after {
  content: '';
  position: absolute;
  width: 1em;
  height: 1em;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}