/* ===== Reset & Variables ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-deep: #050510;
  --bg-card: rgba(12, 12, 40, 0.85);
  --bg-card-solid: #0c0c28;
  --border-glow: rgba(91, 127, 255, 0.15);
  --text-primary: #E2E8F0;
  --text-secondary: #7B8DB0;
  --text-muted: #4A5578;
  --accent-blue: #5B7FFF;
  --accent-purple: #8B5CF6;
  --accent-pink: #EC4899;
  --accent-cyan: #22D3EE;
  --accent-green: #10B981;
  --accent-yellow: #F59E0B;
  --accent-red: #EF4444;
  --accent-orange: #F97316;
  --panel-width: max(760px, 33vw);
}

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
}

/* ===== App Layout ===== */
.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 52px;
  background: rgba(8, 8, 30, 0.92);
  border-bottom: 1px solid var(--border-glow);
  backdrop-filter: blur(12px);
  z-index: 10;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.header-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--accent-blue);
  white-space: nowrap;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  min-width: 0;
  overflow: hidden;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 0.375rem;
  background: none;
  border: none;
  font-family: inherit;
  transition: all 0.2s;
  white-space: nowrap;
}

.breadcrumb-item:hover { color: var(--accent-blue); background: rgba(91, 127, 255, 0.1); }
.breadcrumb-item.active { color: var(--text-primary); font-weight: 600; cursor: default; }
.breadcrumb-item.active:hover { background: none; }
.breadcrumb-sep { color: var(--text-muted); font-size: 0.6875rem; margin: 0 0.125rem; }

/* ===== Depth Control ===== */
.header-center { display: flex; align-items: center; }

.depth-control {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.depth-label-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.depth-slider-wrap { position: relative; }

.depth-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-blue) 0%, var(--accent-purple) 50%, var(--accent-pink) 100%);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.depth-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 0 10px rgba(91, 127, 255, 0.5);
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.depth-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 16px rgba(91, 127, 255, 0.8);
}

.depth-slider::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 0 10px rgba(91, 127, 255, 0.5);
  cursor: pointer;
}

.depth-ticks {
  display: flex;
  justify-content: space-between;
  margin-top: 2px;
  font-size: 0.5625rem;
  color: var(--text-muted);
}

/* ===== Header Right ===== */
.header-right { display: flex; align-items: center; gap: 0.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--border-glow);
  border-radius: 0.5rem;
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8125rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-blue);
  background: rgba(91, 127, 255, 0.1);
}

/* ===== Main Area ===== */
.main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  cursor: grab;
}

.canvas-container:active { cursor: grabbing; }

/* ===== CSS2D Labels ===== */
.node-label-3d {
  color: #fff;
  font-family: 'Noto Sans KR', sans-serif;
  text-align: center;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

.node-label-3d .label-icon {
  display: block;
  font-size: 10px;
  line-height: 1;
  margin-bottom: 2px;
}

.node-label-3d .label-text {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-shadow: 0 0 8px rgba(0,0,0,0.9), 0 1px 3px rgba(0,0,0,0.7);
}

.node-label-3d .label-badge {
  display: inline-block;
  font-size: 8px;
  padding: 1px 5px;
  border-radius: 6px;
  background: var(--accent-blue);
  color: #fff;
  margin-top: 2px;
  font-weight: 600;
}

.node-label-3d.selected .label-text {
  color: var(--accent-cyan);
}

.node-label-3d.level-0 .label-text { font-size: 14px; }
.node-label-3d.level-1 .label-text { font-size: 12px; }
.node-label-3d.level-2 .label-text { font-size: 10px; }

/* ===== Detail Panel (always visible) ===== */
.detail-panel {
  width: var(--panel-width);
  background: rgba(8, 8, 30, 0.95);
  border-left: 1px solid var(--border-glow);
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
  backdrop-filter: blur(12px);
}

.detail-panel::-webkit-scrollbar { width: 5px; }
.detail-panel::-webkit-scrollbar-track { background: transparent; }
.detail-panel::-webkit-scrollbar-thumb { background: rgba(91, 127, 255, 0.2); border-radius: 3px; }

.panel-content { padding: 1.25rem; }

.panel-sticky-nav {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(8, 8, 30, 0.97);
  backdrop-filter: blur(8px);
  padding-bottom: 0.625rem;
  margin: -1.25rem -1.25rem 0.75rem;
  padding: 0.75rem 1.25rem 0.5rem;
  border-bottom: 1px solid var(--border-glow);
}

/* Panel Overview (default) */
.panel-overview-header {
  text-align: center;
  padding: 1.5rem 0 1rem;
}

.panel-overview-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.panel-overview-header p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.panel-section {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-glow);
}

.panel-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.guide-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.guide-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.guide-list li span:first-child { font-size: 1rem; }

/* Color Legend */
.legend-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.375rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 0.375rem 0.5rem;
  border-radius: 0.375rem;
  background: rgba(255,255,255,0.02);
  cursor: pointer;
  border: 1px solid transparent;
  font-family: inherit;
  transition: all 0.2s;
}

.legend-item:hover {
  background: rgba(91, 127, 255, 0.08);
  border-color: var(--border-glow);
}

.legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 6px currentColor;
}

/* Panel Node Detail */
.panel-node-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-glow);
  margin-bottom: 1rem;
}

.panel-node-icon { font-size: 2rem; }

.panel-node-title h2 {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.3;
}

.panel-node-title .node-badge-panel {
  display: inline-block;
  font-size: 0.6875rem;
  padding: 0.125rem 0.5rem;
  border-radius: 0.75rem;
  background: var(--accent-blue);
  color: #fff;
  font-weight: 600;
  margin-left: 0.5rem;
  vertical-align: middle;
}

.detail-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.detail-box {
  border-radius: 0.625rem;
  padding: 0.875rem 1rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.detail-box.analogy {
  background: rgba(91, 127, 255, 0.06);
  border: 1px solid rgba(91, 127, 255, 0.15);
}

.detail-box.tip {
  background: rgba(16, 185, 129, 0.06);
  border: 1px solid rgba(16, 185, 129, 0.15);
}

.detail-box-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.375rem;
}

.difficulty-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.difficulty-badge.easy   { background: rgba(16,185,129,0.12); color: var(--accent-green); }
.difficulty-badge.medium { background: rgba(245,158,11,0.12); color: var(--accent-yellow); }
.difficulty-badge.hard   { background: rgba(239,68,68,0.12); color: var(--accent-red); }

.example-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.example-tag {
  padding: 0.2rem 0.625rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-glow);
  border-radius: 1rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.child-buttons, .related-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.child-btn, .related-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.625rem;
  border-radius: 0.5rem;
  font-size: 0.75rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}

.child-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-glow);
  color: var(--text-primary);
}

.child-btn:hover {
  background: rgba(91, 127, 255, 0.1);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.related-btn {
  background: none;
  border: 1px dashed var(--border-glow);
  color: var(--text-secondary);
}

.related-btn:hover {
  border-color: var(--accent-yellow);
  color: var(--accent-yellow);
  background: rgba(245,158,11,0.06);
}

/* Node hover highlight (synced from 3D canvas hover) */
.child-btn.node-hovered {
  background: rgba(91, 127, 255, 0.1);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  box-shadow: 0 0 12px rgba(91, 127, 255, 0.2);
}

.related-btn.node-hovered {
  border-color: var(--accent-yellow);
  color: var(--accent-yellow);
  background: rgba(245,158,11,0.06);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.2);
}

.legend-item.node-hovered {
  background: rgba(91, 127, 255, 0.08);
  border-color: var(--border-glow);
  box-shadow: 0 0 12px rgba(91, 127, 255, 0.15);
}

.path-step.node-hovered {
  background: color-mix(in srgb, var(--path-color, var(--accent-blue)) 8%, transparent);
  border-color: color-mix(in srgb, var(--path-color, var(--accent-blue)) 25%, transparent);
}

.path-step.node-hovered .path-step-num {
  box-shadow: 0 0 12px color-mix(in srgb, var(--path-color, var(--accent-blue)) 40%, transparent);
}

/* ===== Content Section (학습자료) ===== */
.content-section {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 0.75rem;
  border: 1px solid transparent;
  animation: contentReveal 0.8s ease-out forwards;
}

@keyframes contentReveal {
  0% {
    opacity: 0;
    transform: translateY(12px);
    border-color: transparent;
    background: transparent;
  }
  40% {
    opacity: 1;
    transform: translateY(0);
    border-color: rgba(91, 127, 255, 0.4);
    background: rgba(91, 127, 255, 0.08);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
    border-color: rgba(91, 127, 255, 0.12);
    background: rgba(91, 127, 255, 0.03);
  }
}

.content-section-header {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
}

.content-section-icon {
  font-size: 1.125rem;
}

.content-section-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent-blue);
}

.content-section-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 10px;
  background: rgba(91, 127, 255, 0.2);
  color: var(--accent-blue);
  font-size: 0.6875rem;
  font-weight: 700;
  animation: countPulse 1.2s ease-out 0.3s forwards;
}

@keyframes countPulse {
  0% { transform: scale(1); }
  30% { transform: scale(1.25); background: rgba(91, 127, 255, 0.4); }
  100% { transform: scale(1); background: rgba(91, 127, 255, 0.2); }
}

@keyframes cardSlideIn {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== Content List ===== */
.content-list {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  margin-bottom: 1rem;
}

.content-card {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.625rem 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-glow);
  background: rgba(255,255,255,0.02);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8125rem;
  color: var(--text-primary);
  transition: all 0.2s;
  opacity: 0;
  animation: cardSlideIn 0.4s ease-out forwards;
  animation-delay: calc(var(--i, 0) * 0.06s + 0.3s);
  text-align: left;
  width: 100%;
}

.content-card:hover {
  background: rgba(91, 127, 255, 0.08);
  border-color: var(--accent-blue);
}

.content-card.reading {
  background: rgba(91, 127, 255, 0.12);
  border-color: var(--accent-blue);
}

.content-card-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(91, 127, 255, 0.12);
  color: var(--accent-blue);
  font-size: 0.6875rem;
  font-weight: 700;
  flex-shrink: 0;
}

.content-card-title {
  flex: 1;
  line-height: 1.3;
}

.content-card-arrow {
  color: var(--text-muted);
  font-size: 0.75rem;
  opacity: 0;
  transform: translateX(-4px);
  transition: all 0.2s;
}

.content-card:hover .content-card-arrow {
  opacity: 1;
  transform: translateX(0);
}

.md-viewer {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.md-viewer-back {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.375rem;
  background: rgba(8, 8, 30, 0.95);
  border: 1px solid var(--border-glow);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.75rem;
  transition: all 0.2s;
}

.md-viewer-back:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.md-viewer h1 { font-size: 1.25rem; font-weight: 700; margin: 1.5rem 0 0.75rem; color: var(--accent-blue); }
.md-viewer h2 { font-size: 1.0625rem; font-weight: 700; margin: 1.25rem 0 0.5rem; color: var(--text-primary); }
.md-viewer h3 { font-size: 0.9375rem; font-weight: 600; margin: 1rem 0 0.375rem; color: var(--text-primary); }
.md-viewer p { margin: 0.5rem 0; }
.md-viewer ul, .md-viewer ol { padding-left: 1.25rem; margin: 0.5rem 0; }
.md-viewer li { margin: 0.25rem 0; }
.md-viewer strong { color: var(--accent-cyan); font-weight: 600; }
.md-viewer em { color: var(--text-secondary); font-style: italic; }
.md-viewer code {
  background: rgba(91, 127, 255, 0.1);
  padding: 0.1rem 0.4rem;
  border-radius: 0.25rem;
  font-size: 0.8125rem;
  color: var(--accent-purple);
}
.md-viewer pre {
  background: rgba(0,0,0,0.4);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 0.75rem 0;
  border: 1px solid var(--border-glow);
}
.md-viewer pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.8125rem;
}
.md-viewer blockquote {
  border-left: 3px solid var(--accent-blue);
  padding: 0.375rem 0.75rem;
  margin: 0.75rem 0;
  background: rgba(91, 127, 255, 0.04);
  color: var(--text-secondary);
}
.md-viewer img {
  max-width: 100%;
  border-radius: 0.5rem;
  margin: 0.5rem 0;
}
.md-viewer hr {
  border: none;
  border-top: 1px solid var(--border-glow);
  margin: 1rem 0;
}
.md-viewer a {
  color: var(--accent-blue);
  text-decoration: none;
}
.md-viewer a:hover { text-decoration: underline; }

/* YouTube Embed */
.youtube-embed {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  margin: 1rem 0;
  border-radius: 0.625rem;
  border: 1px solid var(--border-glow);
  background: rgba(0,0,0,0.3);
}
.youtube-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: 0.625rem;
}
.youtube-embed-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.375rem;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.youtube-embed-title::before {
  content: '▶';
  color: #FF0000;
  font-size: 0.75rem;
}
.md-viewer iframe[src*="youtube"] {
  max-width: 100%;
  border-radius: 0.625rem;
}

.youtube-playlist-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  margin: 0.75rem 0;
  border-radius: 0.625rem;
  border: 1px solid rgba(255, 0, 0, 0.2);
  background: linear-gradient(135deg, rgba(255, 0, 0, 0.06), rgba(255, 0, 0, 0.02));
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}
.youtube-playlist-card:hover {
  border-color: rgba(255, 0, 0, 0.4);
  background: linear-gradient(135deg, rgba(255, 0, 0, 0.12), rgba(255, 0, 0, 0.04));
  transform: translateY(-1px);
}
.ypc-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 0, 0, 0.15);
  color: #FF0000;
  font-size: 1rem;
  flex-shrink: 0;
}
.ypc-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}
.ypc-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}
.ypc-sub {
  font-size: 0.6875rem;
  color: var(--text-muted);
}
.ypc-arrow {
  color: var(--text-muted);
  font-size: 0.875rem;
  opacity: 0;
  transition: all 0.2s;
}
.youtube-playlist-card:hover .ypc-arrow {
  opacity: 1;
  color: #FF0000;
}

/* ===== Info Cards (upgraded code blocks) ===== */
.info-card {
  border-radius: 0.625rem;
  margin: 0.875rem 0;
  padding: 1rem 1.125rem;
  border: 1px solid;
  line-height: 1.7;
  font-size: 0.8125rem;
}

.info-card--diagram {
  border-color: rgba(91, 127, 255, 0.25);
  background: linear-gradient(135deg, rgba(91, 127, 255, 0.06) 0%, rgba(91, 127, 255, 0.02) 100%);
}
.info-card--info {
  border-color: rgba(91, 127, 255, 0.25);
  background: linear-gradient(135deg, rgba(91, 127, 255, 0.06) 0%, rgba(91, 127, 255, 0.02) 100%);
}
.info-card--tip {
  border-color: rgba(245, 158, 11, 0.3);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(245, 158, 11, 0.02) 100%);
}
.info-card--warning {
  border-color: rgba(239, 68, 68, 0.3);
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.08) 0%, rgba(239, 68, 68, 0.02) 100%);
}
.info-card--goal {
  border-color: rgba(16, 185, 129, 0.3);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(16, 185, 129, 0.02) 100%);
}
.info-card--checklist {
  border-color: rgba(91, 127, 255, 0.2);
  background: rgba(91, 127, 255, 0.03);
}

.info-card__title {
  font-weight: 700;
  font-size: 0.875rem;
  margin-bottom: 0.625rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  color: var(--text-primary);
}
.info-card--tip .info-card__title { color: var(--accent-yellow); }
.info-card--warning .info-card__title { color: #ef4444; }
.info-card--goal .info-card__title { color: #10b981; }
.info-card--diagram .info-card__title { color: var(--accent-blue); }

.info-card__body {
  color: var(--text-secondary);
}

.info-card__line {
  padding: 0.125rem 0;
}

.info-card__item {
  padding: 0.2rem 0 0.2rem 0.25rem;
}

.info-card__step {
  padding: 0.3rem 0;
  color: var(--text-primary);
  font-weight: 500;
}

.info-card__check {
  padding: 0.2rem 0;
}

/* ===== Goal Panel (목표 선택 화면) ===== */
.goal-panel-header {
  text-align: center;
  padding: 1.5rem 0 0.5rem;
}

.goal-panel-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.375rem;
}

.goal-panel-header p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.goal-cards {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.goal-card {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-glow);
  background: rgba(255,255,255,0.02);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.25s;
  opacity: 0;
  animation: cardSlideIn 0.4s ease-out forwards;
  animation-delay: calc(var(--i, 0) * 0.08s + 0.15s);
  text-align: left;
  width: 100%;
}

.goal-card:hover {
  background: color-mix(in srgb, var(--path-color, var(--accent-blue)) 10%, transparent);
  border-color: var(--path-color, var(--accent-blue));
  transform: translateX(4px);
}

.goal-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 0.625rem;
  background: color-mix(in srgb, var(--path-color, var(--accent-blue)) 12%, transparent);
  font-size: 1.375rem;
  flex-shrink: 0;
}

.goal-card-body {
  flex: 1;
  min-width: 0;
}

.goal-card-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.goal-card-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.125rem;
  line-height: 1.4;
}

.goal-card-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: 1rem;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--path-color, var(--accent-blue));
  background: color-mix(in srgb, var(--path-color, var(--accent-blue)) 12%, transparent);
  white-space: nowrap;
  flex-shrink: 0;
}

.goal-card-arrow {
  color: var(--text-muted);
  font-size: 0.875rem;
  opacity: 0;
  transform: translateX(-4px);
  transition: all 0.2s;
  flex-shrink: 0;
}

.goal-card:hover .goal-card-arrow {
  opacity: 1;
  transform: translateX(0);
  color: var(--path-color, var(--accent-blue));
}

/* ===== Learning Path (학습경로 화면) ===== */
.path-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-glow);
  margin-bottom: 1rem;
}

.path-header-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 0.625rem;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.path-header-text h2 {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.3;
}

.path-header-text p {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.125rem;
}

.path-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.3rem 0.625rem;
  margin-bottom: 1rem;
  border-radius: 0.375rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-glow);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.75rem;
  transition: all 0.2s;
}

.path-back-btn:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.path-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.path-step {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0.625rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
  position: relative;
  opacity: 0;
  animation: cardSlideIn 0.4s ease-out forwards;
  animation-delay: calc(var(--i, 0) * 0.06s + 0.1s);
  text-align: left;
  width: 100%;
  background: none;
  border: 1px solid transparent;
}

.path-step:hover {
  background: color-mix(in srgb, var(--path-color, var(--accent-blue)) 8%, transparent);
  border-color: color-mix(in srgb, var(--path-color, var(--accent-blue)) 25%, transparent);
}

.path-step-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  gap: 0;
}

.path-step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--path-color, var(--accent-blue)) 15%, transparent);
  color: var(--path-color, var(--accent-blue));
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all 0.2s;
}

.path-step:hover .path-step-num {
  box-shadow: 0 0 12px color-mix(in srgb, var(--path-color, var(--accent-blue)) 40%, transparent);
}

.path-step-line {
  width: 2px;
  flex: 1;
  min-height: 12px;
  background: color-mix(in srgb, var(--path-color, var(--accent-blue)) 15%, transparent);
}

.path-step:last-child .path-step-line {
  display: none;
}

.path-step-right {
  flex: 1;
  min-width: 0;
  padding-top: 0.125rem;
}

.path-step-title {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.path-step-title .step-icon {
  font-size: 0.875rem;
}

.path-step-title .step-badge {
  display: inline-block;
  font-size: 0.625rem;
  padding: 0.1rem 0.375rem;
  border-radius: 0.5rem;
  background: var(--accent-blue);
  color: #fff;
  font-weight: 600;
}

.path-step-why {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  line-height: 1.4;
}

/* ===== Escape Hatch (전체 지식맵 / 가이드 복귀) ===== */
.escape-hatch-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  width: 100%;
  padding: 0.625rem 1rem;
  margin-top: 1.5rem;
  border-radius: 0.5rem;
  border: 1px dashed var(--border-glow);
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8125rem;
  transition: all 0.2s;
}

.escape-hatch-btn:hover {
  color: var(--text-secondary);
  border-color: var(--accent-blue);
  background: rgba(91, 127, 255, 0.04);
}

/* ===== Responsive ===== */
@media (max-width: 1400px) {
  :root { --panel-width: max(760px, 38vw); }
}

@media (max-width: 1100px) {
  :root { --panel-width: max(400px, 45vw); }
}

@media (max-width: 768px) {
  .header { padding: 0 0.75rem; height: 46px; }
  .header-title { font-size: 0.8125rem; }
  .depth-control { display: none; }
  .breadcrumb-item { font-size: 0.6875rem; padding: 0.15rem 0.375rem; }
  .btn { font-size: 0.75rem; padding: 0.25rem 0.5rem; }

  .main-area { flex-direction: column; }

  .detail-panel {
    width: 100%;
    height: 40vh;
    border-left: none;
    border-top: 1px solid var(--border-glow);
    flex-shrink: 0;
  }

  .canvas-container { flex: 1; min-height: 0; }

  .node-label-3d .label-text { font-size: 9px !important; }

  .goal-card { padding: 0.75rem 0.875rem; }
  .goal-card-icon { width: 36px; height: 36px; font-size: 1.125rem; }
  .goal-card-title { font-size: 0.8125rem; }
  .goal-panel-header h2 { font-size: 1.0625rem; }
  .path-step { padding: 0.625rem 0.5rem; }
}

@media (max-width: 480px) {
  .breadcrumb { display: none; }
  .detail-panel { height: 35vh; }
}