/* ════════════════════════════════════════════════════════════
   LEARNING MAP ENGINE — PIT STOP / Community Days R&D 2026
   Design system: Oswald + JetBrains Mono, neon #00FF87
   ════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg-deep: #0D0D0D;
  --bg-surface: #111111;
  --bg-card: #111111;
  --bg-card-hover: #1A1A1A;
  --text-primary: #E0E0E0;
  --text-secondary: #999999;
  --text-muted: #666666;

  --neon: #00FF87;
  --neon-dim: rgba(0, 255, 135, 0.19);
  --neon-glow: rgba(0, 255, 135, 0.09);
  --card-border: #1E1E1E;

  /* Layer colors — all use neon green with varying opacity */
  --basics-glow: #00FF87;
  --basics-bg: rgba(0, 255, 135, 0.06);
  --basics-border: rgba(0, 255, 135, 0.25);
  --basics-line: rgba(0, 255, 135, 0.4);
  --basics-label: #00FF87;

  --skills-glow: #38bdf8;
  --skills-bg: rgba(56, 189, 248, 0.06);
  --skills-border: rgba(56, 189, 248, 0.25);
  --skills-line: rgba(56, 189, 248, 0.4);
  --skills-label: #7dd3fc;

  --agents-glow: #fb923c;
  --agents-bg: rgba(251, 146, 60, 0.06);
  --agents-border: rgba(251, 146, 60, 0.25);
  --agents-line: rgba(251, 146, 60, 0.4);
  --agents-label: #fdba74;

  /* Aliases for notion-agents */
  --triggers-glow: var(--skills-glow);
  --triggers-bg: var(--skills-bg);
  --triggers-border: var(--skills-border);
  --triggers-line: var(--skills-line);
  --triggers-label: var(--skills-label);

  --advanced-glow: var(--agents-glow);
  --advanced-bg: var(--agents-bg);
  --advanced-border: var(--agents-border);
  --advanced-line: var(--agents-line);
  --advanced-label: var(--agents-label);

  /* Aliases for n8n */
  --integration-glow: var(--skills-glow);
  --integration-bg: var(--skills-bg);
  --integration-border: var(--skills-border);
  --integration-line: var(--skills-line);
  --integration-label: var(--skills-label);

  --ai-glow: var(--agents-glow);
  --ai-bg: var(--agents-bg);
  --ai-border: var(--agents-border);
  --ai-line: var(--agents-line);
  --ai-label: var(--agents-label);

  /* Aliases for Gemini path */
  --transition-glow: var(--basics-glow);
  --transition-bg: var(--basics-bg);
  --transition-border: var(--basics-border);
  --transition-line: var(--basics-line);
  --transition-label: var(--basics-label);

  --workspace-glow: var(--skills-glow);
  --workspace-bg: var(--skills-bg);
  --workspace-border: var(--skills-border);
  --workspace-line: var(--skills-line);
  --workspace-label: var(--skills-label);

  --mastery-glow: var(--agents-glow);
  --mastery-bg: var(--agents-bg);
  --mastery-border: var(--agents-border);
  --mastery-line: var(--agents-line);
  --mastery-label: var(--agents-label);

  --shared-glow: #a78bfa;
  --node-future-opacity: 0.35;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%;
  min-height: 100vh;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: 'Oswald', sans-serif;
  font-weight: 300;
  line-height: 1.625;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.04) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse 600px 600px at 50% 30%, var(--neon-glow), transparent);
  pointer-events: none;
  z-index: 0;
}

/* ── HEADER ── */
.header {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 48px 24px 16px;
}

.header h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #fff;
}

.header h1 span {
  color: var(--neon);
}

.header p {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  font-family: 'JetBrains Mono', monospace;
}

.header-subtitle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--neon);
  margin-bottom: 8px;
  opacity: 0.7;
}

.header-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.7rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
  transition: color 0.2s;
}

.header-back:hover { color: var(--neon); }

/* ── MODE TOGGLE (Jour J / Complet) ── */
.mode-toggle {
  display: flex;
  justify-content: center;
  gap: 0;
  margin: 16px auto 0;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 3px;
  width: fit-content;
}

.mode-btn {
  padding: 6px 18px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.mode-btn:hover { color: var(--text-secondary); }

.mode-btn--active {
  background: var(--neon);
  color: #0D0D0D;
}

.mode-badge {
  display: inline-block;
  font-size: 0.6rem;
  padding: 1px 5px;
  border-radius: 3px;
  margin-left: 4px;
  vertical-align: middle;
  font-weight: 700;
}

.mode-badge--jour-j {
  background: rgba(0, 255, 135, 0.1);
  color: var(--neon);
  border: 1px solid rgba(0, 255, 135, 0.25);
}

/* ── LEGEND ── */
.legend {
  position: relative;
  z-index: 10;
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 16px 24px 8px;
  flex-wrap: wrap;
}

.legend-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: default;
}

.legend-item[data-layer] {
  cursor: help;
  padding: 4px 10px;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}

.legend-item[data-layer]:hover {
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
}

.legend-tooltip {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  width: 280px;
  background: var(--bg-surface);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 14px 16px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
  z-index: 200;
}

.legend-item[data-layer]:hover .legend-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0px);
}

.legend-tooltip-name {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.legend-tooltip-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.legend-tooltip-desc strong { color: var(--text-primary); font-weight: 600; }

.legend-tooltip::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-bottom-color: rgba(255,255,255,0.1);
}

.legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

/* ── SVG CONNECTIONS ── */
.connections-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: visible;
}

.conn-prereq {
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  transition: stroke-width 0.2s, filter 0.2s;
}

.conn-highlight {
  stroke-width: 2.5 !important;
  filter: drop-shadow(0 0 3px currentColor);
}

.conn-cross-section { opacity: 0.1; transition: opacity 0.3s, stroke-width 0.2s, filter 0.2s; }
.conn-cross-section.conn-highlight { opacity: 1; }
.arrow-cross-section { opacity: 0; transition: opacity 0.3s; }
.arrow-cross-section.conn-highlight { opacity: 1; }

.conn-arrow {
  stroke: none;
  stroke-width: 0;
  animation: arrowAppear 0.3s ease-out backwards;
}

/* ── TREE CONTAINER ── */
.tree-container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 48px 100px;
}

/* ── LAYER ── */
.layer {
  position: relative;
  z-index: 1;
  margin-bottom: 200px;
}

.layer:last-child { margin-bottom: 0; }

.layer-label {
  position: relative;
  z-index: 2;
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
  font-family: 'Oswald', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 8px 14px;
  border-radius: 6px;
  margin-bottom: 28px;
}

.layer-label-name {
  display: flex;
  align-items: center;
  gap: 6px;
}

.layer-tagline {
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  text-transform: none;
  opacity: 0.7;
  line-height: 1.4;
}

.layer-builds-on {
  position: absolute;
  top: 50%;
  left: 100%;
  transform: translateY(-50%);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  font-style: italic;
  white-space: nowrap;
  pointer-events: none;
  padding: 6px 12px 6px 10px;
  line-height: 1.45;
  border-radius: 0 6px 6px 0;
  opacity: 0.7;
}

/* Layer-specific label colors — using CSS custom props */
.layer--basics .layer-label { color: var(--basics-label); background: var(--basics-bg); backdrop-filter: blur(8px); border: 1px solid var(--basics-border); }
.layer--skills .layer-label { color: var(--skills-label); background: var(--skills-bg); backdrop-filter: blur(8px); border: 1px solid var(--skills-border); }
.layer--agents .layer-label { color: var(--agents-label); background: var(--agents-bg); backdrop-filter: blur(8px); border: 1px solid var(--agents-border); }
.layer--triggers .layer-label { color: var(--triggers-label); background: var(--triggers-bg); backdrop-filter: blur(8px); border: 1px solid var(--triggers-border); }
.layer--advanced .layer-label { color: var(--advanced-label); background: var(--advanced-bg); backdrop-filter: blur(8px); border: 1px solid var(--advanced-border); }
.layer--integration .layer-label { color: var(--integration-label); background: var(--integration-bg); backdrop-filter: blur(8px); border: 1px solid var(--integration-border); }
.layer--ai .layer-label { color: var(--ai-label); background: var(--ai-bg); backdrop-filter: blur(8px); border: 1px solid var(--ai-border); }
.layer--transition .layer-label { color: var(--transition-label); background: var(--transition-bg); backdrop-filter: blur(8px); border: 1px solid var(--transition-border); }
.layer--workspace .layer-label { color: var(--workspace-label); background: var(--workspace-bg); backdrop-filter: blur(8px); border: 1px solid var(--workspace-border); }
.layer--mastery .layer-label { color: var(--mastery-label); background: var(--mastery-bg); backdrop-filter: blur(8px); border: 1px solid var(--mastery-border); }

.layer--basics .layer-builds-on { background: var(--basics-bg); border: 1px solid var(--basics-border); border-left: none; }
.layer--skills .layer-builds-on { background: var(--skills-bg); border: 1px solid var(--skills-border); border-left: none; }
.layer--agents .layer-builds-on { background: var(--agents-bg); border: 1px solid var(--agents-border); border-left: none; }
.layer--triggers .layer-builds-on { background: var(--triggers-bg); border: 1px solid var(--triggers-border); border-left: none; }
.layer--advanced .layer-builds-on { background: var(--advanced-bg); border: 1px solid var(--advanced-border); border-left: none; }
.layer--integration .layer-builds-on { background: var(--integration-bg); border: 1px solid var(--integration-border); border-left: none; }
.layer--ai .layer-builds-on { background: var(--ai-bg); border: 1px solid var(--ai-border); border-left: none; }
.layer--transition .layer-builds-on { background: var(--transition-bg); border: 1px solid var(--transition-border); border-left: none; }
.layer--workspace .layer-builds-on { background: var(--workspace-bg); border: 1px solid var(--workspace-border); border-left: none; }
.layer--mastery .layer-builds-on { background: var(--mastery-bg); border: 1px solid var(--mastery-border); border-left: none; }

/* Layer node grid — generic layout */
.layer-nodes {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

/* ── NODE ── */
.node {
  position: relative;
  width: 200px;
  min-height: 100px;
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 2;
}

.node:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 255, 135, 0.3);
  box-shadow: 0 0 20px var(--neon-glow);
  transform: translateY(-3px);
  z-index: 10;
}

.node--done {
  background: var(--bg-card);
  border-color: var(--card-border);
}

.node--done::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 12px;
  padding: 1px;
  background: linear-gradient(135deg, var(--glow-color), transparent 60%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0.6;
  transition: opacity 0.3s;
}

.node--done:hover::before { opacity: 1; }

.node--done::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 12px;
  box-shadow: 0 0 30px -5px var(--glow-color);
  opacity: 0.12;
  pointer-events: none;
  transition: opacity 0.3s;
}

.node--done:hover::after { opacity: 0.28; }

.node--future {
  background: rgba(17, 17, 17, 0.5);
  border-style: dashed;
  border-color: rgba(255,255,255,0.06);
}

.node--future .node-title,
.node--future .node-tags,
.node--future .node-number { opacity: 0.45; }

.node--future:hover { background: rgba(26, 35, 50, 0.55); }

.node--future:hover .node-title,
.node--future:hover .node-tags,
.node--future:hover .node-number { opacity: 0.75; }

.node--hidden { display: none !important; }

.node-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 2px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}

/* Node number colors per layer */
.layer--basics .node-number { background: var(--basics-bg); color: var(--basics-label); border: 1px solid var(--basics-border); }
.layer--skills .node-number { background: var(--skills-bg); color: var(--skills-label); border: 1px solid var(--skills-border); }
.layer--agents .node-number { background: var(--agents-bg); color: var(--agents-label); border: 1px solid var(--agents-border); }
.layer--triggers .node-number { background: var(--triggers-bg); color: var(--triggers-label); border: 1px solid var(--triggers-border); }
.layer--advanced .node-number { background: var(--advanced-bg); color: var(--advanced-label); border: 1px solid var(--advanced-border); }
.layer--integration .node-number { background: var(--integration-bg); color: var(--integration-label); border: 1px solid var(--integration-border); }
.layer--ai .node-number { background: var(--ai-bg); color: var(--ai-label); border: 1px solid var(--ai-border); }
.layer--transition .node-number { background: var(--transition-bg); color: var(--transition-label); border: 1px solid var(--transition-border); }
.layer--workspace .node-number { background: var(--workspace-bg); color: var(--workspace-label); border: 1px solid var(--workspace-border); }
.layer--mastery .node-number { background: var(--mastery-bg); color: var(--mastery-label); border: 1px solid var(--mastery-border); }

.node-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-left: auto;
}

.node-status--done {
  background: var(--glow-color);
  box-shadow: 0 0 8px var(--glow-color);
}

.node-status--future {
  border: 1.5px solid var(--text-muted);
  background: transparent;
}

.node-status--completed {
  background: #34d399;
  box-shadow: 0 0 8px #34d399;
}

.node-title {
  font-family: 'Oswald', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
  text-transform: uppercase;
}

.node--future .node-title { color: var(--text-secondary); }

.node-concepts {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.node--done .node-concepts { color: var(--text-secondary); }

.node-jour-j-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.5rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(0, 255, 135, 0.15);
  color: var(--neon);
  border: 1px solid rgba(0, 255, 135, 0.3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── TOOLTIP ── */
.tooltip {
  position: fixed;
  z-index: 200;
  background: var(--bg-surface);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  padding: 12px 16px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s, transform 0.2s;
  max-width: 320px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}

.tooltip--visible {
  opacity: 1;
  transform: translateY(0);
}

.tooltip-apis-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.tooltip-apis {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

/* ── DETAIL PANEL ── */
.detail-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(13, 13, 13, 0.97);
  border-top: 1px solid var(--card-border);
  padding: 0;
  z-index: 100;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  height: fit-content;
  max-height: 65vh;
  overflow-y: auto;
  overscroll-behavior: contain;
  backdrop-filter: blur(24px);
}

.detail-panel--visible { transform: translateY(0); }

.detail-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--panel-accent, rgba(255,255,255,0.1));
  opacity: 0.7;
}

.detail-panel::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(to bottom, var(--panel-accent-bg, transparent), transparent);
  pointer-events: none;
  opacity: 0.5;
}

.detail-inner {
  position: relative;
  display: grid;
  grid-template-columns: 2fr 1px 3fr;
  gap: 0 32px;
  padding: 24px 40px 28px;
  max-width: 1280px;
  margin: 0 auto;
  min-height: 100%;
}

.detail-divider {
  background: rgba(255,255,255,0.06);
  align-self: stretch;
}

.detail-panel-close {
  position: absolute;
  top: 16px;
  right: 24px;
  background: none;
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-muted);
  width: 26px;
  height: 26px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: all 0.2s;
  z-index: 10;
}

.detail-panel-close:hover {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.15);
}

/* Left column */
.detail-left { display: flex; flex-direction: column; gap: 16px; }

.detail-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.detail-number {
  font-family: 'Oswald', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  opacity: 0.25;
  flex-shrink: 0;
  min-width: 48px;
}

.detail-title-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 2px;
}

.detail-title {
  font-family: 'Oswald', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  text-transform: uppercase;
  margin: 0;
}

.detail-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.detail-layer-badge {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 3px;
}

.detail-status-badge {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 3px;
}

.detail-status-badge--done {
  background: rgba(52, 211, 153, 0.12);
  color: #6ee7b7;
  border: 1px solid rgba(52, 211, 153, 0.2);
}

.detail-status-badge--future {
  background: rgba(255,255,255,0.03);
  color: var(--text-muted);
  border: 1px solid rgba(255,255,255,0.06);
}

/* Progress dots */
.detail-progress {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 0 0;
}

.detail-progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  transition: all 0.2s;
}

.detail-progress-dot--done { background: rgba(255,255,255,0.15); }
.detail-progress-dot--future { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.06); }
.detail-progress-dot--current { transform: scaleY(1.6); }
.detail-progress-dot--completed { background: rgba(52, 211, 153, 0.5); }

/* Shared concepts bridges */
.detail-bridges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 2px;
}

.detail-bridge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  color: var(--shared-glow);
  background: rgba(167, 139, 250, 0.06);
  border: 1px solid rgba(167, 139, 250, 0.15);
  border-radius: 4px;
  padding: 3px 8px;
  font-family: 'JetBrains Mono', monospace;
}

.detail-bridge-arrow { color: rgba(167, 139, 250, 0.4); font-size: 0.6rem; }
.detail-bridge-target { font-weight: 700; font-size: 0.6rem; opacity: 0.7; }

/* Insights */
.detail-insights {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 2px;
}

.detail-insight {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.55;
  padding: 7px 0 7px 12px;
  border-left: 2px solid var(--panel-accent, rgba(255,255,255,0.15));
  font-style: italic;
}

.detail-insight strong { color: var(--text-primary); font-style: normal; font-weight: 600; }
.detail-insight code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--text-primary);
  font-style: normal;
}

/* Right column */
.detail-right { display: flex; flex-direction: column; gap: 14px; }

.detail-section { margin: 0; }

.detail-section-label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 600;
}

/* Steps (guided exercises) */
.detail-steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.detail-step {
  display: flex;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 8px;
  transition: all 0.2s;
}

.detail-step:hover {
  background: rgba(255,255,255,0.03);
  border-color: rgba(255,255,255,0.08);
}

.detail-step-number {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-muted);
  min-width: 20px;
  padding-top: 1px;
}

.detail-step-content {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.detail-step-instruction {
  font-size: 0.8rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.detail-step-expected {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.4;
  font-style: italic;
}

.detail-step-copyable {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #0d1117;
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 6px;
  padding: 6px 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-secondary);
  overflow-x: auto;
}

.detail-step-copy-btn {
  flex-shrink: 0;
  background: none;
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.65rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.detail-step-copy-btn:hover {
  background: rgba(255,255,255,0.05);
  color: var(--text-secondary);
  border-color: rgba(255,255,255,0.15);
}

/* APIs/concepts tags */
.detail-apis {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.api-tag {
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  color: var(--text-secondary);
  transition: all 0.15s;
  cursor: pointer;
}

.api-tag:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.12);
  color: var(--text-primary);
}

.api-tag--active {
  background: rgba(255,255,255,0.08) !important;
  border-color: rgba(255,255,255,0.2) !important;
  color: var(--text-primary) !important;
}

/* API inspect view */
.api-inspect { display: flex; flex-direction: column; gap: 12px; }

.api-inspect-back {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.68rem;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  font-family: inherit;
  transition: color 0.15s;
  align-self: flex-start;
}

.api-inspect-back:hover { color: var(--text-secondary); }

.api-inspect-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.api-inspect-from {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  padding: 3px 8px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 4px;
  display: inline-block;
  align-self: flex-start;
}

.api-inspect-detail {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.api-inspect-detail code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--text-primary);
}

.api-inspect-signature {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 5px;
  padding: 8px 12px;
  line-height: 1.5;
  white-space: pre-wrap;
}

/* Prereqs */
.detail-prereqs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.detail-prereq-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 5px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}

.detail-prereq-chip:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.15);
  color: var(--text-primary);
}

.detail-prereq-num {
  font-weight: 700;
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  opacity: 0.5;
}

/* Mark as done button */
.detail-mark-done {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 6px;
  border: 1px solid rgba(52, 211, 153, 0.3);
  background: rgba(52, 211, 153, 0.08);
  color: #6ee7b7;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 8px;
  align-self: flex-start;
}

.detail-mark-done:hover {
  background: rgba(52, 211, 153, 0.15);
  border-color: rgba(52, 211, 153, 0.45);
}

.detail-mark-done--completed {
  background: rgba(52, 211, 153, 0.15);
  border-color: rgba(52, 211, 153, 0.4);
  cursor: default;
}

/* Code snippet */
.detail-code-section { margin-top: auto; flex: 1; display: flex; flex-direction: column; }

.detail-code {
  position: relative;
  white-space: pre;
  background: #0d1117;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  padding: 14px 18px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  line-height: 1.65;
  overflow-x: auto;
  color: #e2e8f0;
  flex: 1;
  overflow-y: auto;
}

/* ── ENTRANCE ANIMATIONS ── */
@keyframes nodeAppear {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.node { animation: nodeAppear 0.5s cubic-bezier(0.4, 0, 0.2, 1) backwards; }

@keyframes drawLine {
  from { stroke-dashoffset: var(--line-len); }
  to { stroke-dashoffset: 0; }
}

.conn-prereq { animation: drawLine 0.5s ease-out backwards; }

@keyframes arrowAppear {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes detailFadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.detail-left, .detail-right {
  animation: detailFadeUp 0.35s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}

.detail-right { animation-delay: 0.06s; }

/* ── SECTION DIVIDER (trunk / branches) ── */
.section-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 80px 0 40px;
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-divider::before,
.section-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.06);
}