/* ============================================
   Buttons
   Variants: primary, secondary, ghost, emergency
   Sizes: default, sm, lg
   ============================================ */

/* --- Base button --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-fast),
    box-shadow var(--transition-base);
  white-space: nowrap;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  /* Minimum touch target */
  min-height: 44px;
}

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

.btn:active {
  transform: scale(0.98);
}

/* Disabled state */
.btn:disabled,
.btn[aria-disabled='true'] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* --- Primary (filled accent) --- */

.btn--primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

/* --- Secondary (outlined) --- */

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

.btn--secondary:hover {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

/* --- Ghost (text only) --- */

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: transparent;
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}

.btn--ghost:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-accent);
}

/* --- Emergency CTA (accent + pulse) --- */

.btn--emergency {
  background-color: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
  font-size: var(--fs-base);
  font-weight: 700;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  animation: pulse-emergency 2.5s ease-in-out infinite;
}

.btn--emergency:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  animation: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

@keyframes pulse-emergency {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(200, 81, 43, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(200, 81, 43, 0);
  }
}

/* --- Sizes --- */

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

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

/* --- Button with icon --- */

.btn svg,
.btn img {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

/* --- Full width variant --- */

.btn--full {
  width: 100%;
}

/* --- On dark backgrounds --- */

.section--primary .btn--secondary {
  color: var(--color-text-inverse);
  border-color: var(--color-text-inverse);
}

.section--primary .btn--secondary:hover {
  background-color: var(--color-text-inverse);
  color: var(--color-primary);
}

.section--primary .btn--ghost {
  color: var(--color-text-inverse);
}

.section--primary .btn--ghost:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* --- Reduced motion --- */

@media (prefers-reduced-motion: reduce) {
  .btn--emergency {
    animation: none;
  }
}