.version-index .selection-goal {
  margin-top: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  padding: 18px;
}

.version-index .page-subtitle-followup {
  margin-top: 10px;
}

.version-index .selection-goal h2 {
  margin: 0 0 6px;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.version-index .selection-goal p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  max-width: 860px;
  line-height: 1.6;
}

.version-index .goal-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.version-index .goal-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f8fafc;
  padding: 12px 13px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.version-index .goal-card:hover {
  border-color: rgba(21, 147, 137, 0.26);
  transform: translateY(-1px);
}

.version-index .goal-card strong {
  display: block;
  font-size: 13px;
  margin-bottom: 3px;
}

.version-index .goal-card span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.35;
}

.version-index .model-overview-grid,
.version-index .model-resources-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.version-index .model-overview-item,
.version-index .model-resource-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #ffffff;
  padding: 18px;
}

.version-index .model-overview-item h2,
.version-index .model-resource-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.version-index .model-overview-item p,
.version-index .model-resource-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.version-index .model-resource-link {
  display: inline-flex;
  margin-top: 14px;
  text-decoration: none;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

.version-index .diagram-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 18px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
}

.version-index .diagram-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  padding: 6px 4px 0;
}

.version-index .diagram-header h2 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.01em;
}

.version-index .preview-panel {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafc;
  padding: 12px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}

.version-index .preview-text small {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 3px;
}

.version-index .preview-text strong {
  display: block;
  font-size: 15px;
  margin-bottom: 2px;
}

.version-index .preview-text span {
  display: block;
  font-size: 13px;
  color: var(--muted);
  max-width: 800px;
  line-height: 1.35;
}

.version-index .preview-link {
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 10px;
  color: var(--text);
  background: #ffffff;
  white-space: nowrap;
}

.version-index .preview-link:hover {
  border-color: rgba(21, 147, 137, 0.26);
  color: var(--accent);
}

.version-index .desktop-diagram {
  display: block;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbfe 100%);
  padding: 10px;
}

.version-index .diagram {
  min-width: 980px;
  width: 100%;
  height: auto;
  display: block;
}

.version-index .dashed-panel {
  fill: rgba(241, 245, 249, 0.85);
  stroke: #94a3b8;
  stroke-width: 1.6;
  stroke-dasharray: 4 8;
  rx: 16;
  ry: 16;
}

.version-index .arrow {
  fill: none;
  stroke: #64748b;
  stroke-width: 2;
  marker-end: url(#arrowhead);
}

.version-index .node-box {
  fill: #ffffff;
  stroke: #334155;
  stroke-width: 1.5;
  rx: 14;
  ry: 14;
  transition: stroke 0.2s ease, transform 0.2s ease, filter 0.2s ease, fill 0.2s ease;
}

.version-index .node-root,
.version-index .node-core,
.version-index .node-special,
.version-index .node-next {
  fill: #ffffff;
}

.version-index .node-label {
  fill: #111827;
  font-size: 17px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
}

.version-index .node-label-sub {
  font-size: 13px;
  font-weight: 700;
  fill: var(--accent);
}

.version-index .node-link:hover .node-box,
.version-index .node-link:focus .node-box {
  stroke: var(--accent);
  transform: translateY(-1px);
  filter: drop-shadow(0 10px 18px rgba(15, 23, 42, 0.12));
  fill: #fcfeff;
}

.version-index .node-link:focus {
  outline: none;
}

.version-index .diagram-title {
  fill: #0f172a;
  font-size: 26px;
  font-weight: 700;
}

.version-index .mobile-timeline {
  display: none;
  position: relative;
  padding: 8px 0 8px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbfe 100%);
}

.version-index .mobile-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: #cbd5e1;
}

.version-index .timeline-item {
  display: block;
  text-decoration: none;
  color: inherit;
  position: relative;
  margin-bottom: 10px;
}

.version-index .timeline-item:last-child {
  margin-bottom: 0;
}

.version-index .timeline-item::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 1px #94a3b8;
  background: #64748b;
}

.version-index .timeline-item.root::before,
.version-index .timeline-item.core::before,
.version-index .timeline-item.special::before,
.version-index .timeline-item.next::before { background: #64748b; }

.version-index .timeline-content {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
}

.version-index .timeline-item:hover .timeline-content {
  border-color: rgba(21, 147, 137, 0.26);
}

.version-index .timeline-content strong {
  display: block;
  font-size: 14px;
  margin-bottom: 3px;
}

.version-index .timeline-content span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.version-index .grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 30px;
}

.version-index .version-card {
  text-decoration: none;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.version-index .version-card:hover {
  border-color: rgba(21, 147, 137, 0.26);
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.1);
}

.version-index .version-card strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.version-index .version-card .version-card-tag {
  display: block;
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.version-index .version-card span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.version-index .compare-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 28px;
}

.version-index .compare-header h2 {
  margin: 0 0 4px;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.version-index .compare-header p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
}

.version-index .compare-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.version-index .compare-control label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: #334155;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.version-index .compare-control select {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #f8fafc;
  padding: 9px 10px;
  font-family: inherit;
  font-size: 14px;
  color: #0f172a;
}

.version-index .compare-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafc;
}

.version-index .compare-mobile-cards {
  display: none;
}

.version-index .compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 740px;
}

.version-index .compare-table th,
.version-index .compare-table td {
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  font-size: 13px;
  vertical-align: top;
  text-align: left;
}

.version-index .compare-table th {
  background: #ffffff;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #334155;
}

.version-index .compare-table tbody tr:last-child td {
  border-bottom: none;
}

.version-index .compare-table td:first-child {
  font-weight: 700;
  color: #1f2937;
  width: 25%;
  background: #ffffff;
}

.version-index .compare-diff {
  background: #f5fafc;
}

.version-index .compare-links {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.version-index .compare-links a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 700;
  color: #0f172a;
  background: #ffffff;
}

.version-index .compare-links a:hover {
  border-color: rgba(21, 147, 137, 0.26);
  color: var(--accent);
}

.version-index .compare-mobile-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
  padding: 12px;
}

.version-index .compare-mobile-card + .compare-mobile-card {
  margin-top: 10px;
}

.version-index .compare-mobile-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  letter-spacing: -0.01em;
}

.version-index .compare-mobile-values {
  display: grid;
  gap: 8px;
}

.version-index .compare-mobile-value {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafc;
  padding: 10px;
}

.version-index .compare-mobile-value span {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #334155;
}

.version-index .compare-mobile-value p {
  margin: 0;
  font-size: 13px;
  line-height: 1.45;
  color: #0f172a;
}

.version-detail .meta {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 12px 16px;
  margin-top: 22px;
}

.version-detail .meta dt {
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.version-detail .meta dd {
  margin: 0;
  color: #111827;
  font-size: 15px;
}

.version-detail .chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.version-detail .version-tag {
  margin: 2px 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.version-detail .access-card {
  overflow: hidden;
}

.version-detail .access-card-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.8fr);
  gap: 18px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(135deg, #ffffff 0%, #f7fbff 55%, #eff8f6 100%);
  padding: 18px;
}

.version-detail .access-copy h2 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.version-detail .access-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.version-detail .access-copy .access-meta {
  margin-top: 10px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.version-detail .access-actions {
  display: grid;
  gap: 10px;
  align-content: start;
}

.version-detail .access-btn {
  justify-content: center;
  text-align: center;
}

.version-detail .access-resource-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.version-detail .access-resource-notes p {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f8fafc;
  padding: 12px 14px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.version-detail .chip {
  border: 1px solid var(--line);
  background: #f8fafc;
  border-radius: 999px;
  padding: 7px 11px;
  font-size: 12px;
  color: #334155;
  font-weight: 700;
}

.version-detail .details-grid,
.version-detail .decision-grid,
.version-detail .resources-grid,
.version-detail .nav-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.version-detail .detail-box,
.version-detail .decision-box,
.version-detail .resource-link,
.version-detail .version-link {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #f8fafc;
}

.version-detail .detail-box,
.version-detail .decision-box,
.version-detail .resource-link,
.version-detail .version-link {
  padding: 16px;
}

.version-detail .detail-box h3,
.version-detail .decision-box h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.3;
}

.version-detail .detail-list {
  margin: 0;
  padding-left: 18px;
  color: #1f2937;
  font-size: 15px;
  line-height: 1.65;
}

.version-detail .detail-list li + li {
  margin-top: 6px;
}

.version-detail .decision-box.use {
  border-color: #86efac;
  background: #f0fdf4;
}

.version-detail .decision-box.avoid {
  border-color: #fecaca;
  background: #fef2f2;
}

.version-detail .resource-link {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.version-detail .resource-link:hover,
.version-detail .version-link:hover {
  border-color: #99f6e4;
  transform: translateY(-1px);
}

.version-detail .resource-link strong,
.version-detail .version-link strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
}

.version-detail .resource-link span,
.version-detail .version-link span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
  display: block;
}

.version-detail .version-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

@media (max-width: 980px) {
  .version-index .goal-grid,
  .version-index .grid,
  .version-index .model-overview-grid,
  .version-index .model-resources-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .version-index .desktop-diagram {
    display: none;
  }

  .version-index .mobile-timeline {
    display: block;
  }
}

@media (max-width: 760px) {
  .version-detail .access-card-inner,
  .version-detail .access-resource-notes,
  .version-detail .meta,
  .version-detail .details-grid,
  .version-detail .decision-grid,
  .version-detail .resources-grid,
  .version-detail .nav-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .version-index .grid {
    display: none;
  }

  .version-index .diagram-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .version-index .preview-panel {
    grid-template-columns: 1fr;
  }

  .version-index .compare-controls,
  .version-index .goal-grid {
    grid-template-columns: 1fr;
  }

  .version-index .compare-table-wrap {
    display: none;
  }

  .version-index .compare-mobile-cards {
    display: block;
  }

  .version-index .model-overview-grid,
  .version-index .model-resources-grid {
    grid-template-columns: 1fr;
  }
}