.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
}

.skill-tags span {
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-line);
  font-size: 13px;
  color: var(--color-ink-3);
}

.timeline {
  max-width: 560px;
  margin: 40px auto 0;
  padding-left: 20px;
  border-left: 2px solid var(--color-line);
}

.timeline__item {
  position: relative;
  padding: 0 0 24px 20px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: var(--radius-avatar);
  background: var(--color-primary);
  border: 2px solid var(--surface-page);
}

.friends-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .friends-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.friend-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  padding: 20px;
  text-align: center;
  background: var(--surface-2);
  transition: transform 0.25s, box-shadow 0.25s;
  color: inherit;
  text-decoration: none;
  display: block;
}

.friend-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  color: inherit;
}

.friend-card img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: var(--radius-btn);
  margin-bottom: 12px;
}

.friend-card h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}

.friend-card p {
  font-size: 12px;
  color: var(--color-ink-3);
  margin: 0;
  line-height: 1.5;
}

.error-hero {
  text-align: center;
  padding: 80px 20px 60px;
  max-width: 720px;
  margin: 0 auto;
}

.error-hero__icon {
  font-size: 4rem;
  margin: 0 0 8px;
  color: var(--color-primary);
}

.error-hero__code {
  font-size: clamp(4rem, 12vw, 7rem);
  font-weight: 800;
  color: var(--color-ink-4, var(--color-ink-3));
  line-height: 1;
  margin-bottom: 8px;
}

.error-hero__title {
  font: 700 clamp(20px, 3vw, 28px)/1.3 var(--font-display);
  margin: 0 0 12px;
  color: var(--color-ink);
}

.error-hero__desc {
  color: var(--color-ink-2);
  max-width: 480px;
  margin: 0 auto 28px;
  line-height: 1.65;
}

.error-hero__search {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 480px;
  margin: 0 auto 24px;
  padding: 6px 6px 6px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--surface-1);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.error-hero__search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(240, 68, 148, 0.15);
}

.error-hero__search-icon {
  color: var(--color-ink-3);
  display: inline-flex;
}

.error-hero__search input[type="search"] {
  flex: 1 1 auto;
  border: 0;
  background: transparent;
  outline: none;
  font: 500 14px/1 var(--font-ui);
  color: var(--color-ink);
  padding: 8px 0;
}

.error-hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.error-section {
  max-width: 720px;
  margin: 40px auto;
  padding: 24px;
  background: var(--surface-1);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.error-section__title {
  font: 600 16px/1.2 var(--font-ui);
  margin: 0 0 16px;
  color: var(--color-ink);
}

.error-section__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.error-section__chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--color-ink-2);
  text-decoration: none;
  font: 500 13px/1 var(--font-ui);
  transition: background .18s ease, color .18s ease;
}

.error-section__chip:hover {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.error-section__chip span {
  opacity: .7;
  font-variant-numeric: tabular-nums;
}

.error-section__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.error-section__list li + li {
  border-top: 1px dashed var(--color-line);
}

.error-section__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  color: var(--color-ink);
  text-decoration: none;
  transition: color .18s ease;
}

.error-section__list a:hover .error-section__list-title {
  color: var(--color-primary);
}

.error-section__list-title {
  flex: 1 1 auto;
  font: 500 14px/1.4 var(--font-ui);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.error-section__list-meta {
  flex: 0 0 auto;
  color: var(--color-ink-3);
  font: 500 12px/1 var(--font-ui);
  font-variant-numeric: tabular-nums;
}

/* ============================================================
 * 首页分类推荐模块
 * ============================================================ */
.category-recommend {
  max-width: var(--container);
  margin: 40px auto;
  padding: 0 20px;
}

.category-recommend__header {
  margin-bottom: 24px;
}

.category-recommend__title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-ink);
  position: relative;
  padding-left: 16px;
  margin: 0;
}

.category-recommend__title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background: var(--color-primary);
}

.category-recommend__grid {
  display: grid;
  grid-template-columns: repeat(var(--cr-columns, 2), 1fr);
  gap: 20px;
}

.category-recommend-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--surface-2);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

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

.category-recommend-card__hero {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--surface-3);
}

.category-recommend-card__hero a {
  display: block;
  width: 100%;
  height: 100%;
}

.category-recommend-card__cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.category-recommend-card:hover .category-recommend-card__cover {
  transform: scale(1.02);
}

.category-recommend-card__badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  backdrop-filter: blur(4px);
  pointer-events: none;
}

.category-recommend-card__meta {
  padding: 16px 16px 12px;
}

.category-recommend-card__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
}

.category-recommend-card__name a {
  color: var(--color-ink);
}

.category-recommend-card__name a:hover {
  color: var(--color-primary);
}

.category-recommend-card__desc {
  margin: 0;
  font-size: 14px;
  color: var(--color-ink-3);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.category-recommend-card__posts {
  list-style: none;
  margin: 0;
  padding: 0 16px;
  border-top: 1px solid var(--color-line);
}

.category-recommend-card__post-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-line);
}

.category-recommend-card__post-item:last-child {
  border-bottom: none;
}

.category-recommend-card__post-title {
  flex: 1;
  font-size: 14px;
  color: var(--color-ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}