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

:root {
  --red: #FF6B6B;
  --teal: #4ECDC4;
  --green: #6BCB77;
  --yellow: #FFD93D;
  --purple: #9B59B6;
  --orange: #FF8C42;
  --pink: #FF6B8A;
  --blue: #45B7D1;
  --brown: #8B4513;
  --gray: #808080;
  --white: #F9F9F9;
  --black: #2C3E50;
  --bg: #FFF8F0;
  --header-bg: #5B2C6F;
  --text: #2C3E50;
  --radius: 14px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

#header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--header-bg);
  color: #fff;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.header-brand {
  display: flex;
  flex-direction: column;
  gap: 0;
}

#appTitle {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.1;
}

.header-subtitle {
  font-size: 0.72rem;
  opacity: 0.85;
  font-weight: 500;
}

#mapTitle {
  font-size: 1rem;
  font-weight: 600;
  color: #F9E79F;
  margin-left: 4px;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  background: rgba(255, 255, 255, 0.12);
  border: 2px dashed rgba(255, 255, 255, 0.35);
  border-radius: 12px;
  padding: 6px 12px;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}
#mapTitle:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.02);
}

#status {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 20px;
  font-weight: 600;
  margin-left: auto;
}
#status.saved { background: #27AE60; color: #fff; }
#status.dirty { background: #F39C12; color: #fff; }

#toolbar {
  display: flex;
  gap: 6px;
}

#toolbar button {
  padding: 8px 16px;
  border: none;
  border-radius: 22px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  color: #fff;
}
#toolbar button:hover { transform: scale(1.05); }
#toolbar button:active { transform: scale(0.95); }

#btnHelp    { background: var(--yellow); color: #2C3E50; }
#btnNew     { background: var(--green); }
#btnSave    { background: var(--blue); }
#btnDownload{ background: var(--purple); }
#btnUpload  { background: var(--orange); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#canvasWrapper {
  flex: 1;
  overflow: hidden;
  cursor: grab;
  position: relative;
  background:
    radial-gradient(circle, #ddd 1px, transparent 1px);
  background-size: 24px 24px;
}

.zoom-controls {
  position: absolute;
  bottom: 16px;
  right: 16px;
  display: flex;
  gap: 6px;
  z-index: 100;
  pointer-events: auto;
}

.zoom-controls button {
  width: 36px;
  height: 36px;
  border: 2px solid #ccc;
  border-radius: 50%;
  background: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  transition: transform 0.15s;
}
.zoom-controls button:hover { transform: scale(1.1); }
.zoom-controls button:active { transform: scale(0.9); }
#zoomFit { font-size: 1.1rem; }
#autoOrgToggle { font-size: 1.2rem; transition: background 0.2s, color 0.2s; }
#autoOrgToggle.toggle-off { background: #fff; color: #555; border-color: #ccc; }
#autoOrgToggle.toggle-on { background: var(--teal); color: #fff; border-color: var(--teal); }

#canvasWrapper:active { cursor: grabbing; }

#canvas {
  position: relative;
  width: 4000px;
  height: 4000px;
  transform-origin: 0 0;
}

#svgLayer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#nodesLayer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.node {
  position: absolute;
  border: 3px solid #ccc;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: grab;
  transition: box-shadow 0.2s;
  box-shadow: 0 3px 10px rgba(0,0,0,0.12);
  z-index: 1;
  min-height: 70px;
}
.node.root {
  min-height: 90px;
}
.node:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
  z-index: 10;
}
.node:active { cursor: grabbing; }
.node.selected {
  box-shadow: 0 0 0 4px rgba(52,152,219,0.5), 0 6px 20px rgba(0,0,0,0.2);
  z-index: 5;
}

.node.root {
  border-width: 4px;
  font-size: 1.15rem;
  font-weight: 800;
  z-index: 2;
}

.node-title {
  pointer-events: auto;
  cursor: text;
  font-size: 0.85rem;
  font-weight: 700;
  text-align: center;
  padding: 4px 8px 2px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  line-height: 1.2;
  color: var(--text);
  word-break: break-word;
}
.node.root .node-title { font-size: 1.05rem; }

.node.expanded .node-title {
  display: block;
  -webkit-line-clamp: unset;
  overflow: visible;
  text-overflow: unset;
  white-space: pre-wrap;
}

.node-description {
  font-size: 0.75rem;
  font-weight: 400;
  text-align: left;
  padding: 2px 10px 6px;
  line-height: 1.35;
  color: #444;
  max-width: 100%;
  overflow-y: auto;
  max-height: 90px;
  word-break: break-word;
  white-space: pre-wrap;
  pointer-events: auto;
  cursor: text;
}

.node.expanded .node-description {
  max-height: none;
  overflow-y: visible;
}

.node-icon {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid #ddd;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  line-height: 1;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  z-index: 3;
  pointer-events: none;
}

.resize-handle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 16px;
  height: 16px;
  cursor: nwse-resize;
  background: linear-gradient(135deg, transparent 50%, rgba(0,0,0,0.15) 50%);
  border-radius: 0 0 10px 0;
  pointer-events: auto;
  z-index: 5;
}
.resize-handle:hover {
  background: linear-gradient(135deg, transparent 50%, rgba(0,0,0,0.3) 50%);
}

.expand-toggle {
  width: 24px;
  height: 24px;
  border: 2px solid #999;
  border-radius: 50%;
  background: #f5f5f5;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, background 0.15s;
  color: #555;
  line-height: 1;
  pointer-events: auto;
  padding: 0;
}
.expand-toggle:hover {
  transform: scale(1.15);
  background: #e0e0e0;
}

.node-btns {
  display: flex;
  gap: 4px;
  margin-top: 2px;
  padding-bottom: 6px;
}

.node-btn {
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 50%;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s;
  color: #fff;
  line-height: 1;
  pointer-events: auto;
}
.node-btn:hover { transform: scale(1.2); }
.add-btn { background: var(--green); }
.del-btn { background: var(--red); }

.classify-btn {
  width: 26px;
  height: 26px;
  border: 2px solid #ccc;
  border-radius: 50%;
  background: #f0f0f0;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s, transform 0.15s, border-color 0.2s;
  opacity: 0.4;
  line-height: 1;
  pointer-events: auto;
  padding: 0;
}
.classify-btn:hover {
  opacity: 1;
  transform: scale(1.2);
  border-color: #999;
}

#shareSection {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #EBF5FB;
  border-top: 2px solid #AED6F1;
  flex-shrink: 0;
}

#shareUrl {
  flex: 1;
  padding: 8px 12px;
  border: 2px solid #AED6F1;
  border-radius: 8px;
  font-size: 0.8rem;
  font-family: monospace;
  background: #fff;
  color: #2C3E50;
}

#btnCopyLink {
  padding: 8px 16px;
  border: none;
  border-radius: 20px;
  background: var(--teal);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: transform 0.15s;
  white-space: nowrap;
}
#btnCopyLink:hover { transform: scale(1.05); }

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 999;
  align-items: center;
  justify-content: center;
}

.modal-box {
  background: #fff;
  border-radius: 20px;
  padding: 24px;
  width: 90%;
  max-width: 400px;
  max-height: 85dvh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.modal-box-wide {
  max-width: 520px;
}

.help-content section {
  margin-bottom: 16px;
}

.help-content h3 {
  color: var(--header-bg);
  font-size: 1rem;
  margin-bottom: 8px;
}

.help-content ol,
.help-content ul {
  padding-left: 1.25rem;
  line-height: 1.6;
  font-size: 0.95rem;
}

.help-content li + li {
  margin-top: 6px;
}

.shortcuts kbd {
  display: inline-block;
  background: #f0f0f0;
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 0.85rem;
  font-family: inherit;
}

.modal-box h2 {
  margin-bottom: 12px;
  color: var(--header-bg);
  font-size: 1.2rem;
}

#editTitleInput {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 12px;
  font-size: 1.1rem;
  outline: none;
  transition: border-color 0.2s;
}
#editTitleInput:focus { border-color: var(--teal); }

#editDescInput {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 12px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
  resize: vertical;
  font-family: inherit;
  line-height: 1.4;
}
#editDescInput:focus { border-color: var(--teal); }

.char-counter {
  text-align: right;
  font-size: 0.75rem;
  color: #999;
  margin-bottom: 8px;
  margin-top: 2px;
  min-height: 18px;
}

#editInput {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: 12px;
  font-size: 1.1rem;
  outline: none;
  transition: border-color 0.2s;
}
#editInput:focus { border-color: var(--teal); }

.edit-section {
  margin-bottom: 12px;
}

.edit-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: #555;
  margin-bottom: 6px;
}

.color-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.color-swatch {
  width: 100%;
  aspect-ratio: 1;
  border: 3px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
  position: relative;
}
.color-swatch:hover {
  transform: scale(1.1);
  box-shadow: 0 3px 10px rgba(0,0,0,0.2);
}
.color-swatch.active {
  border-color: var(--text);
  box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.3);
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
}

.icon-item {
  aspect-ratio: 1;
  border: 2px solid transparent;
  border-radius: 8px;
  background: #f5f5f5;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, border-color 0.15s, background 0.15s;
  padding: 0;
}
.icon-item:hover {
  transform: scale(1.15);
  background: #e8e8e8;
}
.icon-item.active {
  border-color: var(--teal);
  background: #e0f7fa;
  box-shadow: 0 0 0 2px rgba(78, 205, 196, 0.3);
}

.modal-btns {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  justify-content: flex-end;
}

.modal-btns button {
  padding: 10px 24px;
  border: none;
  border-radius: 20px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s;
}
.modal-btns button:hover { transform: scale(1.05); }

#editSave { background: var(--green); color: #fff; }
#editCancel { background: #ddd; color: #555; }

.quick-popup {
  position: fixed;
  z-index: 500;
  background: #fff;
  border-radius: 16px;
  padding: 10px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.25);
  min-width: 180px;
  max-width: 320px;
}

.quick-popup-header {
  font-size: 0.8rem;
  font-weight: 700;
  color: #777;
  text-align: center;
  margin-bottom: 6px;
}

.quick-popup-grid {
  display: grid;
  gap: 6px;
}

.quick-popup-grid.colors {
  grid-template-columns: repeat(4, 1fr);
}

.quick-popup-grid.icons {
  grid-template-columns: repeat(6, 1fr);
}

.quick-color-swatch {
  aspect-ratio: 1;
  border: 2px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.12s, border-color 0.12s;
  position: relative;
}
.quick-color-swatch:hover {
  transform: scale(1.15);
  border-color: #555;
  z-index: 1;
}

.quick-icon-item {
  aspect-ratio: 1;
  border: 2px solid transparent;
  border-radius: 8px;
  background: #f5f5f5;
  cursor: pointer;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.12s, background 0.12s;
  padding: 0;
}
.quick-icon-item:hover {
  transform: scale(1.15);
  background: #e0e0e0;
}

.quick-icon-clear {
  border: 2px dashed #ccc;
  background: #fafafa;
  color: #999;
  font-size: 0.8rem;
  font-weight: 700;
}

@media (max-width: 600px) {
  #header { padding: 6px 10px; gap: 6px; }
  #appTitle { font-size: 1rem; }
  #toolbar button { padding: 6px 12px; font-size: 0.8rem; }
  #mapTitle { max-width: 120px; font-size: 0.85rem; }

  .icon-grid {
    grid-template-columns: repeat(6, 1fr);
  }
  .quick-popup-grid.icons {
    grid-template-columns: repeat(5, 1fr);
  }
}