/* Components: Buttons — shared button styles */

/* --- Base Button --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: var(--text-base);
  font-family: inherit;
  text-decoration: none;
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: var(--gradient);
  box-shadow: var(--shadow);
  min-height: 48px;
  min-width: 44px;
  transition: var(--transition);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* Shimmer overlay (shared across main + store) */
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  opacity: 0;
  transform: translateX(-100%);
  transition: transform var(--transition-slow) var(--easing), opacity var(--transition-medium) var(--easing);
}

@media (hover: hover) {
  .btn:hover::before {
    opacity: 1;
    transform: translateX(100%);
  }
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

/* --- Variant: Primary --- */

.btn-primary {
  background: var(--primary-gradient);
  color: var(--primary-text);
  box-shadow: var(--primary-shadow-sm), 0 1px 3px var(--tint-black-6);
}

@media (hover: hover) {
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--primary-shadow-hover);
    color: var(--white);
  }
}

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

/* --- Variant: Secondary --- */

.btn-secondary {
  background: var(--white);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

@media (hover: hover) {
  .btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-border-hover);
    color: var(--text-primary);
  }
}

/* --- Variant: Outline --- */

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
}

@media (hover: hover) {
  .btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-bg-subtle);
    transform: translateY(-2px);
  }
}

/* --- Variant: Confirm (success action) --- */

.btn-confirm {
  background: linear-gradient(135deg, var(--success-color) 0%, var(--success-light) 100%);
  color: #064e3b;
  box-shadow: var(--success-shadow-sm);
}

@media (hover: hover) {
  .btn-confirm:hover {
    box-shadow: var(--success-shadow-lg);
  }
}

/* --- Size Modifiers --- */

.btn-large {
  padding: var(--space-5) var(--space-8);
  font-size: var(--text-lg);
  min-height: 60px;
}

.btn-full {
  width: 100%;
}

/* --- Button Sub-elements --- */

.btn span,
.btn i {
  color: inherit;
  font-weight: inherit;
  pointer-events: none;
}

.btn-subtitle {
  display: block;
  font-size: var(--text-xs);
  font-weight: 400;
  margin-top: var(--space-1);
  opacity: 0.8;
}

/* --- Disabled State --- */

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  filter: grayscale(30%);
}

/* --- Focus & Accessibility --- */

.btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  box-shadow: var(--primary-focus-ring);
}

/* --- Dark-Theme Overrides --- */

[data-theme="dark"] .btn-secondary {
  background: var(--dark-surface-bg);
  color: var(--text-dark-body);
  border-color: var(--dark-border);
}

[data-theme="dark"] .btn-secondary:hover {
  background: var(--bg-dark-elevated);
  border-color: color-mix(in oklch, var(--primary-color) 30%, transparent);
}

[data-theme="dark"] .btn-outline {
  border-color: var(--dark-border);
  color: var(--text-muted);
}

[data-theme="dark"] .btn-outline:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  background: color-mix(in oklch, var(--primary-color) 8%, transparent);
}

[data-theme="dark"] .btn {
  color: var(--primary-text);
}

[data-theme="dark"] .btn-primary {
  box-shadow: var(--shadow-primary);
}

[data-theme="dark"] .btn-primary:hover {
  box-shadow: var(--primary-shadow-hover);
  color: var(--primary-text);
}

[data-theme="dark"] .btn-confirm {
  color: var(--primary-text);
  box-shadow: var(--success-shadow-sm);
}

[data-theme="dark"] .btn-confirm:hover {
  box-shadow: var(--success-shadow-lg);
}

/* --- Reduced-Motion --- */

@media (prefers-reduced-motion: reduce) {
  .btn,
  .btn::before {
    transition-duration: 0.01ms !important;
  }
}