/**
 * AVENIX Venture - Button System
 * Touch-optimized with 48px baseline tap target for mobile priority
 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 var(--space-5);
  font-family: var(--font-heading);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  text-align: center;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
  touch-action: manipulation;
  text-decoration: none;
  position: relative;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

.btn:active {
  transform: translateY(1px) scale(0.98);
  opacity: 1 !important;
  -webkit-tap-highlight-color: transparent;
}

/* Button Variants */
.btn--primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 8px var(--color-primary-glow);
}

.btn--primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 6px 20px var(--color-primary-glow);
  transform: translateY(-1px);
  color: #FFFFFF;
}

.btn--secondary {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border-color: var(--color-border);
  box-shadow: var(--color-shadow-sm);
}

.btn--secondary:hover {
  background-color: var(--color-bg-alt);
  border-color: var(--color-text-muted);
  color: var(--color-text-primary);
  transform: translateY(-1px);
}

.btn--ai {
  background: var(--grad-primary);
  color: #FFFFFF;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 3px 12px var(--color-primary-glow);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn--ai:hover {
  filter: brightness(1.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 6px 22px var(--color-primary-glow);
  transform: translateY(-1px);
  color: #FFFFFF;
}

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

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

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
  min-height: 40px;
  padding: 0 var(--space-3);
}

.btn--ghost:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-alpha);
}

/* Button Sizes */
.btn--sm {
  min-height: 40px;
  padding: 0 var(--space-3);
  font-size: var(--fs-caption);
}

.btn--lg {
  min-height: 52px;
  padding: 0 var(--space-6);
  font-size: var(--fs-body);
  border-radius: var(--radius-full);
}

@media (max-width: 480px) {
  .btn--lg {
    min-height: 48px;
    padding: 0 var(--space-3);
    font-size: var(--fs-body-sm);
  }
}

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

.btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  transition: transform var(--transition-fast);
}

.btn:hover svg.icon-arrow-right {
  transform: translateX(4px);
}