.property-v52-textbook,
.multi-mindmap-deck {
  margin: 28px 0 8px;
  padding: 24px;
  border: 1px solid var(--border, #e3e7e5);
  border-radius: 22px;
  background: var(--surface, #ffffff);
  color: var(--ink, #172033);
  box-shadow: 0 12px 34px rgba(25, 38, 31, 0.06);
}

.property-v52-section-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.property-v52-section-head h3 {
  margin: 4px 0 6px;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.15;
}

.property-v52-section-head p {
  margin: 0;
  max-width: 760px;
  color: var(--muted, #66736c);
  line-height: 1.6;
}

.property-v52-eyebrow {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .14em;
  font-weight: 800;
  color: var(--accent, #246b4f);
}

.property-v52-reading-grid,
.property-v52-visual-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.property-v52-visual-grid {
  margin-top: 18px;
}

.property-v52-reading-card,
.property-v52-visual-card {
  padding: 18px;
  border: 1px solid var(--border, #e4e9e6);
  border-radius: 18px;
  background: var(--surface-soft, #f8faf9);
  min-width: 0;
}

.property-v52-reading-card h4,
.property-v52-visual-card h4 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.3;
}

.property-v52-reading-card p,
.property-v52-zh p {
  margin: 0;
  line-height: 1.68;
  color: var(--ink, #26332d);
}

.property-v52-key {
  margin-top: 14px;
  padding: 11px 13px;
  border-radius: 13px;
  background: color-mix(in srgb, var(--accent, #246b4f) 10%, transparent);
  line-height: 1.45;
  font-size: 13px;
  font-weight: 650;
}

.property-v52-key span {
  display: inline-block;
  margin-right: 8px;
  font-size: 10px;
  letter-spacing: .12em;
  font-weight: 900;
  color: var(--accent, #246b4f);
}

.property-v52-warning {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: #fff7df;
  color: #735516;
  font-size: 13px;
  line-height: 1.5;
}

.property-v52-zh {
  margin-top: 13px;
  padding-top: 11px;
  border-top: 1px dashed var(--border, #dfe5e1);
}

.property-v52-zh summary {
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
  color: var(--accent, #246b4f);
}

.property-v52-zh p {
  padding-top: 9px;
  font-size: 14px;
}

.property-v52-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border, #dfe5e1);
  border-radius: 13px;
  background: var(--surface, #fff);
}

.property-v52-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 440px;
  font-size: 13px;
}

.property-v52-table th,
.property-v52-table td {
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border, #e6ebe8);
  line-height: 1.45;
}

.property-v52-table th {
  background: var(--surface-2, #f2f6f4);
  font-size: 12px;
  font-weight: 800;
}

.property-v52-table tr:last-child td {
  border-bottom: 0;
}

.property-v52-diagram {
  display: flex;
  gap: 24px;
  align-items: stretch;
  overflow-x: auto;
  padding: 6px 2px 9px;
}

.property-v52-node {
  position: relative;
  display: flex;
  gap: 9px;
  align-items: center;
  flex: 0 0 148px;
  min-height: 72px;
  padding: 12px;
  border: 1px solid var(--border, #dce4e0);
  border-radius: 14px;
  background: var(--surface, #fff);
  line-height: 1.35;
}

.property-v52-node span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  border-radius: 50%;
  background: var(--accent, #246b4f);
  color: white;
  font-size: 11px;
  font-weight: 800;
}

.property-v52-node strong {
  font-size: 12px;
  font-weight: 750;
}

.property-v52-node:not(:last-child)::after {
  content: '→';
  position: absolute;
  right: -20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted, #87918c);
  font-weight: 900;
}

.property-v52-diagram.timeline .property-v52-node {
  border-top: 4px solid var(--accent, #246b4f);
}

.property-v52-diagram.decision .property-v52-node:nth-child(even) {
  border-style: dashed;
}

.multi-mindmap-deck {
  overflow: hidden;
}

.multi-mindmap-head {
  margin-bottom: 15px;
}

.multi-mindmap-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 1px 10px;
  scrollbar-width: thin;
}

.multi-mindmap-tab {
  appearance: none;
  border: 1px solid var(--border, #dce4e0);
  background: var(--surface, #fff);
  color: var(--ink, #26332d);
  border-radius: 999px;
  padding: 9px 13px;
  white-space: nowrap;
  font: inherit;
  font-size: 12px;
  font-weight: 750;
  cursor: pointer;
}

.multi-mindmap-tab.active {
  border-color: var(--accent, #246b4f);
  background: var(--accent, #246b4f);
  color: white;
}

.multi-mindmap-panel {
  display: none;
  padding-top: 9px;
}

.multi-mindmap-panel.active {
  display: block;
}

.multi-mindmap-canvas {
  position: relative;
  display: grid;
  grid-template-columns: minmax(150px, .7fr) minmax(0, 2fr);
  gap: 22px;
  align-items: center;
  min-height: 260px;
  padding: 22px;
  border: 1px solid var(--border, #dfe6e2);
  border-radius: 20px;
  background:
    radial-gradient(circle at 16% 50%, color-mix(in srgb, var(--accent, #246b4f) 12%, transparent), transparent 34%),
    var(--surface-soft, #f8faf9);
}

.multi-mindmap-center {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  text-align: center;
  min-height: 130px;
  padding: 18px;
  border-radius: 50%;
  background: var(--accent, #246b4f);
  color: white;
  box-shadow: 0 14px 28px rgba(28, 80, 60, .18);
}

.multi-mindmap-center span {
  font-size: 10px;
  letter-spacing: .16em;
  font-weight: 900;
  opacity: .75;
}

.multi-mindmap-center strong {
  max-width: 160px;
  font-size: 16px;
  line-height: 1.25;
}

.multi-mindmap-branches {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.multi-mindmap-branch {
  position: relative;
  padding: 14px;
  border: 1px solid var(--border, #dce5e0);
  border-radius: 15px;
  background: var(--surface, #fff);
}

.multi-mindmap-branch::before {
  content: '';
  position: absolute;
  left: -23px;
  top: 50%;
  width: 22px;
  border-top: 1px solid var(--accent, #6a8f7d);
}

.multi-mindmap-branch > strong {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
}

.multi-mindmap-branch > div {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.multi-mindmap-branch span {
  display: inline-block;
  padding: 5px 7px;
  border-radius: 8px;
  background: var(--surface-2, #f1f5f3);
  font-size: 11px;
  line-height: 1.3;
}

@media (max-width: 880px) {
  .property-v52-reading-grid,
  .property-v52-visual-grid {
    grid-template-columns: 1fr;
  }

  .multi-mindmap-canvas {
    grid-template-columns: 1fr;
  }

  .multi-mindmap-center {
    max-width: 190px;
    min-height: 110px;
    margin: 0 auto;
  }

  .multi-mindmap-branch::before {
    display: none;
  }
}

@media (max-width: 620px) {
  .property-v52-textbook,
  .multi-mindmap-deck {
    margin-left: -4px;
    margin-right: -4px;
    padding: 17px;
    border-radius: 17px;
  }

  .property-v52-diagram {
    flex-direction: column;
    overflow: visible;
    gap: 9px;
  }

  .property-v52-node {
    flex-basis: auto;
    width: 100%;
    min-height: 0;
  }

  .property-v52-node:not(:last-child)::after {
    content: '↓';
    right: auto;
    left: 22px;
    top: auto;
    bottom: -12px;
    transform: none;
  }

  .multi-mindmap-branches {
    grid-template-columns: 1fr;
  }
}

@media print {
  .multi-mindmap-tabs {
    display: none;
  }

  .multi-mindmap-panel {
    display: block !important;
    break-inside: avoid;
    margin-bottom: 16px;
  }

  .property-v52-textbook,
  .multi-mindmap-deck,
  .property-v52-reading-card,
  .property-v52-visual-card {
    box-shadow: none;
    break-inside: avoid;
  }
}