/* ===========================
   Timeline Page Styles
   =========================== */

.timeline-page-header {
  padding: 1.5rem 2rem 0.5rem;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}
.timeline-page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.25rem 0;
}
.timeline-page-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Filter Tabs --- */
.timeline-filter-bar {
  position: sticky;
  top: var(--topbar-height);
  z-index: 5;
  background: var(--body-bg);
  padding: 0.75rem 2rem;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}
.timeline-filter-tabs {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.timeline-filter-tabs::-webkit-scrollbar { display: none; }
.timeline-filter-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
  text-decoration: none;
}
.timeline-filter-tab:hover {
  border-color: rgba(var(--accent-rgb), 0.3);
  color: var(--accent);
  text-decoration: none;
}
.timeline-filter-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.timeline-filter-tab.active:hover {
  text-decoration: none;
  color: #fff;
}
.timeline-filter-tab i {
  font-size: 0.85rem;
}
.timeline-filter-count {
  font-size: 0.7rem;
  opacity: 0.7;
  margin-left: 0.125rem;
}

/* --- Feed Container --- */
.timeline-feed {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0.5rem 2rem 2rem;
}

/* --- Feed Card (Base) --- */
.timeline-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: box-shadow 0.2s, opacity 0.3s ease;
}
.timeline-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.timeline-card.timeline-card-hidden {
  opacity: 0;
  display: none;
}

/* --- Card Header (User + Action + Time) --- */
.timeline-card-header {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1rem 0.625rem;
}
.timeline-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
}
.timeline-avatar-img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.timeline-card-user-info {
  flex: 1;
  min-width: 0;
}
.timeline-card-action-text {
  font-size: 0.85rem;
  color: var(--text-primary);
  line-height: 1.4;
}
.timeline-card-action-text strong {
  font-weight: 600;
}
.timeline-card-action-text .action-verb {
  color: var(--text-secondary);
}
.timeline-card-time {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: 2px;
}

/* --- Action Type Icon --- */
.timeline-action-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}
.action-icon-create {
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
}
.action-icon-achieve {
  background: rgba(255, 183, 0, 0.12);
  color: #d4960a;
}
.action-icon-comment {
  background: rgba(42, 74, 122, 0.12);
  color: #2a4a7a;
}
.action-icon-clear {
  background: rgba(34, 197, 94, 0.12);
  color: #16a34a;
}
.action-icon-milestone {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
}
.timeline-milestone-banner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.08));
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 8px;
  color: #b45309;
  font-weight: 600;
  font-size: 0.95rem;
}
.timeline-milestone-banner i {
  font-size: 1.25rem;
  color: #d97706;
}

/* --- Card Content: Featured (Song Creation) --- */
.timeline-card-featured {
  border-left: 3px solid var(--accent);
}
.timeline-card-content {
  padding: 0 1rem 0.875rem;
}

/* --- Thumbnail Row --- */
.timeline-thumbnail-row {
  display: flex;
  gap: 0.875rem;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.timeline-thumbnail-row:hover .timeline-song-title {
  color: var(--accent);
}
.timeline-thumbnail-container {
  position: relative;
  width: 200px;
  min-width: 200px;
  aspect-ratio: 16/9;
  border-radius: 6px;
  overflow: hidden;
  background: var(--input-bg, rgba(128,128,128,0.1));
}
.timeline-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.timeline-thumbnail-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 2rem;
  opacity: 0.4;
}
.timeline-thumb-badge {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(0,0,0,0.78);
  color: #f0f0f0;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 3px;
}
.timeline-thumb-channel {
  position: absolute;
  top: 6px;
  left: 6px;
  background: rgba(0,0,0,0.78);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #f0f0f0;
  font-size: 0.68rem;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 3px;
  max-width: calc(100% - 12px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Song Info (beside thumbnail) --- */
.timeline-song-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.timeline-song-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.375rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.2s;
}
.timeline-song-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}
.timeline-stat {
  display: flex;
  align-items: center;
  gap: 3px;
}
.timeline-stat i {
  font-size: 0.8rem;
}
.timeline-level-stars .active {
  color: #ffb700;
  text-shadow: 0 0 2px rgba(255,183,0,0.5);
}

/* --- Pending/New Badge --- */
.timeline-badge-new {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  padding: 1px 6px;
  border-radius: 3px;
  margin-left: 0.375rem;
  vertical-align: middle;
  letter-spacing: 0.03em;
}
.timeline-badge-pending {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.6rem;
  font-weight: 600;
  background: rgba(255,183,0,0.12);
  color: #b8860b;
  padding: 2px 8px;
  border-radius: 3px;
  margin-left: 0.375rem;
  vertical-align: middle;
}

/* --- Achievement Stats Row --- */
.timeline-achieve-stats {
  display: flex;
  gap: 1rem;
  padding: 0.5rem 1rem 0.75rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  margin-top: 0.5rem;
}
.achieve-stat {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.achieve-stat-value {
  font-weight: 700;
  color: var(--text-primary);
}

/* --- Card Footer (Interactions) --- */
.timeline-card-footer {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  border-top: 1px solid var(--border-color);
}
.timeline-card-footer-btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.5rem;
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
  border-radius: 6px;
  border: none;
  background: none;
  color: var(--text-secondary);
  font-size: 0.78rem;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
  text-decoration: none;
}
.timeline-card-footer-btn:hover {
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
}
.timeline-card-footer-btn i {
  font-size: 0.9rem;
}

/* --- Compact Card (for likes/comments - smaller) --- */
.timeline-card-compact .timeline-thumbnail-container {
  width: 120px;
  min-width: 120px;
}
.timeline-card-compact .timeline-song-title {
  font-size: 0.85rem;
  -webkit-line-clamp: 1;
}

/* --- Guest CTA (inline, between cards) --- */
.timeline-guest-cta {
  display: none;
}

/* --- User Profile Link --- */
.timeline-user-link {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s;
}
.timeline-user-link:hover {
  color: var(--accent);
}

/* --- Live Activity Indicator --- */
.timeline-live-indicator {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  padding: 0.375rem 0;
}
.timeline-live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* --- Load More --- */
.timeline-load-more {
  text-align: center;
  padding: 1.5rem 0;
}
.timeline-load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 2rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.timeline-load-more-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* --- Empty State --- */
.timeline-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}
.timeline-empty i {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  display: block;
  opacity: 0.4;
}
.timeline-empty-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.375rem;
}
.timeline-empty-text {
  font-size: 0.85rem;
}

/* --- Utemita (打ってみた) Card Styles --- */
.action-icon-utemita {
  background: linear-gradient(135deg, #6c63ff, #a855f7);
  color: #fff;
}

.timeline-utemita-row {
  text-decoration: none;
  color: inherit;
}

.timeline-utemita-platform {
  position: absolute;
  bottom: 6px;
  right: 6px;
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  backdrop-filter: blur(4px);
}

.timeline-utemita-origin {
  font-size: 0.75rem;
  color: var(--text-muted, #888);
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
  .timeline-page-header {
    padding: 1.25rem 1.25rem 0.375rem;
  }
  .timeline-page-title {
    font-size: 1.5rem;
  }
  .timeline-filter-bar {
    padding: 0.625rem 1.25rem;
  }
  .timeline-feed {
    padding: 0.5rem 1.25rem 2rem;
  }
  .timeline-thumbnail-container {
    width: 160px;
    min-width: 160px;
  }
  .timeline-card-compact .timeline-thumbnail-container {
    width: 100px;
    min-width: 100px;
  }
}

@media (max-width: 480px) {
  .timeline-page-header {
    padding: 1rem 1rem 0.25rem;
  }
  .timeline-page-title {
    font-size: 1.35rem;
  }
  .timeline-filter-bar {
    padding: 0.5rem 1rem;
  }
  .timeline-filter-tab {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
  }
  .timeline-feed {
    padding: 0.25rem 0.75rem 2rem;
  }
  .timeline-card {
    margin-bottom: 0.75rem;
  }
  .timeline-thumbnail-row {
    flex-direction: column;
    gap: 0.625rem;
  }
  .timeline-thumbnail-container {
    width: 100%;
    min-width: 100%;
  }
  .timeline-card-compact .timeline-thumbnail-container {
    width: 100%;
    min-width: 100%;
  }
  .timeline-card-compact .timeline-song-title {
    -webkit-line-clamp: 2;
  }
  .timeline-card-header {
    padding: 0.75rem 0.75rem 0.5rem;
  }
  .timeline-card-content {
    padding: 0 0.75rem 0.75rem;
  }
  .timeline-card-footer {
    padding: 0.4rem 0.75rem;
  }
  .timeline-achieve-stats {
    padding: 0.4rem 0.75rem 0.625rem;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
}