/**
 * 用户已购买内容页面样式
 * 遵循 ui-style-rules.md 规范
 */

/* ========== 页面布局 ========== */
.user-purchased-page {
  max-width: 75rem;
  margin: 0 auto;
  padding: var(--spacing-6) var(--spacing-4);
}

/* ========== 页面头部 ========== */
.page-header {
  margin-bottom: var(--spacing-6);
}

.page-header h1 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-2) 0;
}

.page-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: 0;
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========== 旧版页面头部（兼容） ========== */
.purchased-header {
  margin-bottom: var(--spacing-6);
}

.purchased-header__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-2) 0;
}

.purchased-header__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ========== 工具栏 ========== */
.purchased-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-4);
  padding: var(--spacing-3) var(--spacing-4);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
}

.purchased-toolbar__filters {
  display: flex;
  gap: var(--spacing-3);
  align-items: center;
}

.purchased-toolbar__select {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  min-width: 7.5rem;
}

.purchased-toolbar__select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-alpha-20);
}

.purchased-toolbar__count {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ========== 列表区域 ========== */
.purchased-list-section {
  margin-bottom: var(--spacing-6);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-4);
  flex-wrap: wrap;
  gap: var(--spacing-3);
}

.section-actions {
  display: flex;
  gap: var(--spacing-3);
}

.filter-select {
  appearance: none;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-2) var(--spacing-8) var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-2) center;
}

.filter-select:hover {
  border-color: var(--color-border-hover);
}

.filter-select:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 2px var(--color-brand-bg);
}

/* ========== 内容列表 ========== */
.purchased-list {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.purchased-list__skeleton {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-4);
  padding: var(--spacing-4);
}

.purchased-item-skeleton {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
}

.skeleton {
  background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-secondary) 50%, var(--color-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

.skeleton--cover {
  width: 100%;
  height: 7.5rem;
  margin-bottom: var(--spacing-3);
}

.skeleton--title {
  width: 80%;
  height: 1.25rem;
  margin-bottom: var(--spacing-2);
}

.skeleton--text {
  width: 60%;
  height: 1rem;
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.purchased-list__content {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17.5rem, 1fr));
  gap: var(--spacing-4);
  padding: var(--spacing-4);
}

.purchased-list__empty,
.purchased-list__error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
  padding: var(--spacing-12);
  text-align: center;
}

.empty-icon,
.error-icon {
  font-size: var(--font-size-3xl);
}

.empty-message,
.error-message {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ========== 内容卡片 ========== */
.purchased-item {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.purchased-item:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
}

.purchased-item__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.purchased-item__cover {
  width: 100%;
  height: 8.75rem;
  background-size: cover;
  background-position: center;
  background-color: var(--color-bg-tertiary);
}

.purchased-item__body {
  padding: var(--spacing-4);
}

.purchased-item__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-2) 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.purchased-item__author {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--spacing-3) 0;
}

.purchased-item__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.purchased-item__price {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warning);
}

.purchased-item__date {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* ========== 旧版内容卡片（兼容） ========== */
.purchased-card {
  display: flex;
  gap: var(--spacing-4);
  padding: var(--spacing-4);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.purchased-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
}

.purchased-card__cover {
  flex-shrink: 0;
  width: 10rem;
  height: 6.25rem;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.purchased-card__cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.purchased-card__cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-tertiary);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-2xl);
}

.purchased-card__body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.purchased-card__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-2) 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.purchased-card__title:hover {
  color: var(--color-primary);
}

.purchased-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.purchased-card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
}

.purchased-card__meta-icon {
  font-size: var(--font-size-base);
  opacity: 0.7;
}

.purchased-card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.purchased-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-3);
  padding-top: var(--spacing-3);
  border-top: 1px solid var(--color-border-secondary);
}

.purchased-card__price {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warning);
}

.purchased-card__actions {
  display: flex;
  gap: var(--spacing-2);
}

.purchased-card__btn {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.purchased-card__btn--primary {
  color: var(--color-text-on-primary);
  background: var(--color-primary);
  border: none;
}

.purchased-card__btn--primary:hover {
  background: var(--color-primary-hover);
}

.purchased-card__btn--secondary {
  color: var(--color-text-secondary);
  background: transparent;
  border: 1px solid var(--color-border-primary);
}

.purchased-card__btn--secondary:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-hover);
  background: var(--color-bg-secondary);
}

/* ========== 状态样式 ========== */
/* 加载态 */
.purchased-card--skeleton {
  pointer-events: none;
}

.purchased-card--skeleton .purchased-card__cover {
  background: var(--color-bg-tertiary);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.purchased-card--skeleton .purchased-card__title,
.purchased-card--skeleton .purchased-card__meta,
.purchased-card--skeleton .purchased-card__desc {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  color: transparent;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.purchased-card--skeleton .purchased-card__title {
  width: 70%;
  height: 20px;
}

.purchased-card--skeleton .purchased-card__meta {
  width: 50%;
  height: 16px;
}

.purchased-card--skeleton .purchased-card__desc {
  width: 90%;
  height: 32px;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* 空态 */
.purchased-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-12) var(--spacing-4);
  text-align: center;
}

.purchased-empty__icon {
  font-size: var(--font-size-5xl);
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-4);
}

.purchased-empty__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-2) 0;
}

.purchased-empty__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--spacing-6) 0;
}

.purchased-empty__btn {
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-on-primary);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.purchased-empty__btn:hover {
  background: var(--color-primary-hover);
}

/* 错误态 */
.purchased-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-12) var(--spacing-4);
  text-align: center;
}

.purchased-error__icon {
  font-size: var(--font-size-5xl);
  color: var(--color-error);
  margin-bottom: var(--spacing-4);
}

.purchased-error__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-2) 0;
}

.purchased-error__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--spacing-6) 0;
}

.purchased-error__btn {
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-on-primary);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.purchased-error__btn:hover {
  background: var(--color-primary-hover);
}

/* ========== 分页 ========== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-4);
  margin-top: var(--spacing-4);
}

.pagination__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination__btn:hover:not(:disabled) {
  border-color: var(--color-border-hover);
  background: var(--color-bg-hover);
}

.pagination__btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination__info {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ========== 按钮样式（请使用组件层） ========== */
/* Use component button styles from `components/_buttons.css`. Page-specific small variant may be implemented via `.btn--sm` modifier in components if needed; avoid redefining `.btn` in page styles. */

/* ========== 旧版分页（兼容） ========== */
.purchased-pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-2);
  margin-top: var(--spacing-6);
  padding-top: var(--spacing-6);
  border-top: 1px solid var(--color-border-secondary);
}

.purchased-pagination__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: var(--spacing-9);
  height: var(--spacing-9);
  padding: 0 var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.purchased-pagination__btn:hover:not(:disabled) {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.purchased-pagination__btn--active {
  color: var(--color-text-on-primary);
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.purchased-pagination__btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .purchased-toolbar {
    flex-direction: column;
    gap: var(--spacing-3);
    align-items: stretch;
  }

  .purchased-toolbar__filters {
    flex-wrap: wrap;
  }

  .purchased-card {
    flex-direction: column;
  }

  .purchased-card__cover {
    width: 100%;
    height: 11.25rem;
  }

  .purchased-card__footer {
    flex-direction: column;
    gap: var(--spacing-3);
    align-items: stretch;
  }

  .purchased-card__actions {
    justify-content: stretch;
  }

  .purchased-card__btn {
    flex: 1;
    text-align: center;
  }
}