/* =============================================
   TATTVAM — Knowledge Tree Page CSS
   ============================================= */

/* ——— Page Layout ——— */
.tree-page {
  padding-top: var(--nav-height);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-cream);
  overflow-x: hidden;
}

.tree-header {
  text-align: center;
  padding: var(--space-10) var(--space-6) var(--space-6);
  position: relative;
  overflow: hidden;
}

.tree-header h1 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  color: var(--color-text-dark);
  margin-bottom: var(--space-3);
}

.tree-header p {
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  max-width: 540px;
  margin: 0 auto;
}

/* ——— Main Layout ——— */
.tree-body-wrapper {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 340px;
  max-width: var(--max-width-wide);
  width: 100%;
  margin: 0 auto var(--space-20);
  padding: 0 var(--space-6);
  gap: var(--space-6);
  min-height: 550px;
}

/* Tree visualization container */
.tree-viewport {
  background: var(--color-warm-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: auto;
  position: relative;
}

/* ——— Tree Structure (CSS-based) ——— */
.tree-root {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tree-ul {
  display: flex;
  padding-top: 24px;
  position: relative;
  transition: all 0.5s;
  gap: var(--space-4);
}

.tree-li {
  float: left;
  text-align: center;
  list-style-type: none;
  position: relative;
  padding: 24px 5px 0 5px;
  transition: all 0.5s;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Connectors using pseudo elements */
.tree-li::before, .tree-li::after {
  content: '';
  position: absolute;
  top: 0;
  right: 50%;
  border-top: 1.5px solid var(--color-champagne);
  width: 50%;
  height: 24px;
}

.tree-li::after {
  right: auto;
  left: 50%;
  border-left: 1.5px solid var(--color-champagne);
}

/* Remove connectors for single elements */
.tree-li:only-child::after, .tree-li:only-child::before {
  display: none;
}

.tree-li:only-child {
  padding-top: 0;
}

.tree-li:first-child::before, .tree-li:last-child::after {
  border: none;
}

.tree-li:last-child::before {
  border-right: 1.5px solid var(--color-champagne);
  border-radius: 0 5px 0 0;
}

.tree-li:first-child::after {
  border-radius: 5px 0 0 0;
}

/* Vertical connectors from parent */
.tree-ul::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  border-left: 1.5px solid var(--color-champagne);
  width: 0;
  height: 24px;
}

/* ——— Node Styling ——— */
.tree-node {
  background: var(--color-parchment);
  border: 1.5px solid var(--color-border-medium);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-dark);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  z-index: 5;
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}

.tree-node:hover {
  background: var(--color-warm-white);
  border-color: var(--color-gold);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.tree-node.active {
  background: var(--color-text-dark);
  color: var(--color-cream);
  border-color: var(--color-text-dark);
}

/* Indicators for expandable nodes */
.tree-node::after {
  content: '✦';
  font-size: 8px;
  color: var(--color-gold);
  position: absolute;
  top: 2px;
  right: 4px;
}

.tree-node.active::after {
  color: var(--color-champagne);
}

/* ——— Right Column: Node details sidepanel ——— */
.tree-sidebar {
  background: var(--color-warm-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.sidebar-heading {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-weight: 500;
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: var(--space-2);
}

.tree-detail-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: var(--space-1);
}

.tree-detail-sanskrit {
  font-family: var(--font-sanskrit);
  font-size: var(--text-sm);
  color: var(--color-gold);
  margin-bottom: var(--space-4);
  display: block;
}

.tree-detail-desc {
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.tree-detail-sublist-title {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.tree-detail-sublist {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.sublist-item {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: 1.5;
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-border-medium);
}

/* ——— Responsive ——— */
@media (max-width: 1024px) {
  .tree-body-wrapper {
    grid-template-columns: 1fr;
    padding: 0 var(--space-4) var(--space-10);
  }
}