.viewer-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: linear-gradient(135deg, #f7fafc 0%, #eef3f6 100%);
}

/* ─ Header ─ */
.viewer-header {
  flex-shrink: 0;
  background: rgba(255,255,255,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 52px;
  z-index: 20;
}

.viewer-brand {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.viewer-brand-icon {
  width: 22px;
  height: 22px;
  background: var(--text-primary);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer-brand-icon svg {
  width: 13px;
  height: 13px;
  fill: white;
}

.viewer-header-spacer {
  flex: 1;
}

.viewer-header-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

.viewer-header-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.viewer-logout-btn {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 5px 12px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.15s;
}

.viewer-logout-btn:hover {
  background: var(--surface-bg);
  color: var(--text-primary);
}

/* ─ Body layout ─ */
.viewer-body {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ─ Sidebar ─ */
.viewer-sidebar {
  width: 220px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: rgba(255,255,255,0.70);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 16px 12px;
  gap: 4px;
}

.viewer-sidebar-title {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 8px 8px;
}

.viewer-source-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: background 0.12s;
  color: var(--text-primary);
}

.viewer-source-btn:hover {
  background: rgba(0,0,0,0.05);
}

.viewer-source-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.viewer-source-btn.active .viewer-source-screen {
  color: var(--accent);
  opacity: 0.75;
}

.viewer-source-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--surface-bg);
  flex-shrink: 0;
}

.viewer-source-avatar-placeholder {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

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

.viewer-source-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.viewer-source-screen {
  font-size: 11px;
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ─ Main feed area ─ */
.viewer-main {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
}

.viewer-feed {
  max-width: 680px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

/* ─ Tweet card ─ */
.viewer-card {
  background: white;
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 2px 12px rgba(15,20,25,0.06);
  border: 1px solid rgba(235,238,240,0.8);
  transition: box-shadow 0.2s, transform 0.15s;
}

.viewer-card:hover {
  box-shadow: 0 6px 24px rgba(15,20,25,0.10);
  transform: translateY(-1px);
}

.viewer-card-author {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.viewer-card-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--surface-bg);
  flex-shrink: 0;
}

.viewer-card-avatar-placeholder {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.viewer-card-author-info {
  flex: 1;
  min-width: 0;
}

.viewer-card-author-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.viewer-card-author-handle {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.viewer-card-date {
  font-size: 11px;
  color: var(--text-tertiary);
  white-space: nowrap;
  flex-shrink: 0;
}

.viewer-card-text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 12px;
}

.viewer-card-images {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
  border-radius: 12px;
  overflow: hidden;
}

.viewer-card-images.count-1 { grid-template-columns: 1fr; }
.viewer-card-images.count-2 { grid-template-columns: 1fr 1fr; }
.viewer-card-images.count-3 { grid-template-columns: 1fr 1fr; }
.viewer-card-images.count-3 .viewer-card-img:first-child { grid-column: 1 / -1; }
.viewer-card-images.count-4 { grid-template-columns: 1fr 1fr; }

.viewer-card-img-wrap {
  overflow: hidden;
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  background: var(--surface-bg);
}

.viewer-card-img-wrap::after {
  content: '';
  display: block;
  padding-bottom: 60%;
}

.viewer-card-images.count-1 .viewer-card-img-wrap::after { padding-bottom: 55%; }

.viewer-card-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.viewer-card-img.is-loaded { opacity: 1; }

.viewer-card-img:hover { opacity: 0.9; }

/* Single image: render at its true aspect ratio (no crop), with a height cap */
.viewer-card-images.count-1 {
  display: block;
}
.viewer-card-images.count-1 .viewer-card-img-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100px;
}
.viewer-card-images.count-1 .viewer-card-img-wrap::after {
  content: none;
}
.viewer-card-images.count-1 .viewer-card-img {
  position: static;
  inset: auto;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 560px;
  object-fit: contain;
}

.viewer-card-video-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.viewer-card-video-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
}

.viewer-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 10px;
  border-top: 1px solid var(--border-light);
}

.viewer-card-metrics {
  display: flex;
  gap: 14px;
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
}

.viewer-card-metric {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.viewer-card-link {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}

.viewer-card-link:hover {
  text-decoration: underline;
}

/* ─ States ─ */
.viewer-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 48px 24px;
  color: var(--text-tertiary);
  font-size: 14px;
}

.viewer-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: viewer-spin 0.6s linear infinite;
}

@keyframes viewer-spin { to { transform: rotate(360deg); } }

.viewer-empty {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-tertiary);
}

.viewer-empty-icon {
  font-size: 36px;
  margin-bottom: 12px;
  opacity: 0.5;
}

.viewer-empty-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.viewer-empty-sub {
  font-size: 13px;
}

.viewer-load-more-wrap {
  display: flex;
  justify-content: center;
  padding: 20px 0;
}

.viewer-load-more-btn {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 10px 28px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.15s;
  box-shadow: var(--shadow-sm);
}

.viewer-load-more-btn:hover:not(:disabled) {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
  color: var(--accent);
}

.viewer-load-more-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ─ Mobile ─ */
@media (max-width: 640px) {
  .viewer-sidebar {
    display: none;
  }

  .viewer-main {
    padding: 14px 12px;
  }

  .viewer-card {
    border-radius: 12px;
    padding: 14px;
  }

  .viewer-header {
    padding: 0 14px;
  }

  .viewer-header-name {
    display: none;
  }
}

/* ─ Inline links in tweet text ─ */
.viewer-card-text a {
  color: var(--accent);
  text-decoration: none;
  word-break: break-all;
}
.viewer-card-text a:hover { text-decoration: underline; }

/* ─ Lightbox (image viewer) ─ */
.viewer-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(4px);
  padding: 56px 16px 84px;
}
.viewer-lightbox.is-open { display: flex; }
.viewer-lightbox-img {
  max-width: min(92vw, 1200px);
  max-height: 82vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  user-select: none;
}
.viewer-lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.viewer-lightbox-close:hover { background: rgba(255, 255, 255, 0.24); }
.viewer-lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.viewer-lightbox-nav:hover { background: rgba(255, 255, 255, 0.24); }
.viewer-lightbox-nav.prev { left: 16px; }
.viewer-lightbox-nav.next { right: 16px; }
.viewer-lightbox-bar {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 16px;
}
.viewer-lightbox-counter {
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.viewer-lightbox-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  border-radius: 999px;
  background: #fff;
  color: #0f1419;
  font-size: 14px;
  font-weight: 700;
  padding: 9px 18px;
  cursor: pointer;
  transition: opacity 0.15s;
}
.viewer-lightbox-download:hover { opacity: 0.85; }
.viewer-lightbox-download svg { width: 16px; height: 16px; }

@media (max-width: 640px) {
  .viewer-lightbox-nav { width: 40px; height: 40px; font-size: 26px; }
  .viewer-lightbox-nav.prev { left: 8px; }
  .viewer-lightbox-nav.next { right: 8px; }
}