body {
  min-height: 100vh;
  padding-bottom: calc(var(--tab-bar-height) + var(--safe-area-bottom) + 8px);
}

#app {
  min-height: 100vh;
}

.page {
  min-height: 100vh;
  padding-bottom: var(--space-xl);
}

.page-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-title);
  padding: var(--space-lg);
}

.section {
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  margin: var(--space-sm) var(--space-md);
  padding: var(--space-lg);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-title);
}

.price {
  color: var(--color-price);
  font-weight: 600;
}

.price::before {
  content: '¥';
  font-size: 0.8em;
}

.price-original {
  color: var(--color-price-original);
  text-decoration: line-through;
  font-size: var(--font-size-sm);
  margin-left: var(--space-xs);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  height: 44px;
  padding: 0 18px;
  border-radius: var(--radius-round);
  font-size: var(--font-size-base);
  font-weight: 700;
  transition: opacity 0.18s ease, transform 0.18s ease;
  user-select: none;
}

.btn:active {
  opacity: 0.7;
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-white);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text-body);
}

.btn-outline {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-small {
  min-height: 40px;
  height: 40px;
  padding: 0 14px;
  font-size: var(--font-size-sm);
}

.btn-large {
  height: 44px;
  padding: 0 var(--space-xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-disabled {
  opacity: 0.5;
  pointer-events: none;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px var(--space-xl);
  color: var(--color-text-secondary);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--space-lg);
  opacity: 0.4;
}

.empty-state-text {
  font-size: var(--font-size-base);
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

body.low-performance .section,
body.low-performance .product-card,
body.low-performance .user-menu,
body.low-performance .knowledge-output,
body.low-performance .modal {
  box-shadow: none;
}

.tag-primary {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.tag-virtual {
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-secondary);
}