.collection-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.collection-hero {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 0;
  margin-bottom: 8px;
}

.collection-back-btn {
  flex-shrink: 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.2s;
}

.collection-back-btn:hover {
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  border-color: var(--brand-primary);
}

.collection-hero-inner {
  flex: 1;
  min-width: 0;
}

.collection-hero-avatars {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}

.collection-hero-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--surface);
  margin-left: -8px;
}

.collection-hero-avatar:first-child {
  margin-left: 0;
}

.collection-hero-avatar-fallback {
  background: var(--bg-tertiary);
}

.collection-hero-title {
  font-size: 24px;
  font-weight: 800;
  margin: 0 0 4px 0;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.collection-hero-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.collection-hero-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-muted);
}

.collection-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
}

.collection-tab {
  flex: 1;
  padding: 14px 16px;
  border: none;
  background: none;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  color: var(--text-muted);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

.collection-tab:hover {
  color: var(--text-primary);
}

.collection-tab.active {
  color: var(--brand-primary);
  border-bottom-color: var(--brand-primary);
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  grid-auto-rows: 8px;
  column-gap: 24px;
  row-gap: 0;
}

.leaderboard-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 12px;
  transition: all 0.2s;
}

.leaderboard-row:hover {
  border-color: var(--brand-primary);
  background: rgba(99, 102, 241, 0.04);
}

.leaderboard-rank {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-muted);
  min-width: 32px;
  text-align: center;
}

.leaderboard-row:nth-child(1) .leaderboard-rank { color: #F59E0B; }
.leaderboard-row:nth-child(2) .leaderboard-rank { color: #9CA3AF; }
.leaderboard-row:nth-child(3) .leaderboard-rank { color: #B45309; }

.leaderboard-avatar {
  flex-shrink: 0;
}

.leaderboard-info {
  flex: 1;
  min-width: 0;
}

.leaderboard-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.leaderboard-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.leaderboard-views {
  font-size: 14px;
  font-weight: 700;
  color: var(--brand-primary);
  white-space: nowrap;
}

@media (max-width: 768px) {
  .collection-layout {
    padding: 0 16px 80px;
  }

  .collection-hero {
    padding: 20px 0;
  }

  .collection-hero-title {
    font-size: 20px;
  }

  .collection-grid {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 12px;
  }
  .collection-grid > .blog-card,
  .collection-grid > .bundle-card {
    grid-column: 1 / -1;
  }

  .leaderboard-row {
    padding: 12px;
    gap: 12px;
  }

  .leaderboard-views {
    font-size: 13px;
  }
}