:root {
  color-scheme: light;
  --bg: #f6f3ef;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #52616b;
  --accent: #2f3c7e;
  --border: #e0dcd7;
  --shadow: 0 18px 40px rgba(31, 41, 51, 0.12);
  --node-stroke: #1f2933;
}

* {
  box-sizing: border-box;
  font-family: "DM Sans", "Plus Jakarta Sans", "Helvetica Neue", sans-serif;
}

body {
  margin: 0;
  background: radial-gradient(circle at 20% 20%, #ffffff 0%, #f6f3ef 45%, #efe9e2 100%);
  color: var(--ink);
  overflow: hidden;
  user-select: none;
}

.app {
  position: relative;
  min-height: 100vh;
}

.panel {
  padding: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  z-index: 2;
  height: 100vh;
  overflow-y: auto;
}

.panel-right {
  border-right: none;
  border-left: 1px solid var(--border);
  box-shadow: none;
  left: auto;
  right: 0;
}

.panel-left {
  position: fixed;
  left: 0;
  top: 0;
  width: 320px;
  border-right: 1px solid var(--border);
  transition: transform 0.25s ease;
}

.settings-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 5;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  font-size: 18px;
}

.auth-trigger {
  position: fixed;
  top: 16px;
  right: 70px;
  z-index: 5;
  height: 44px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 0 14px;
  font-size: 13px;
  font-weight: 600;
}

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 320px;
  height: 100vh;
  transform: translateX(100%);
  transition: transform 0.2s ease;
  z-index: 4;
  visibility: hidden;
  pointer-events: none;
}

.settings-panel.open {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

.settings-panel h3 {
  margin: 16px 0 8px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 14px;
}

.status-line {
  padding: 10px 12px;
  border-radius: 10px;
  background: #f7f2ed;
  border: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.export-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.auth-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 8;
  display: none;
}

.auth-modal.open {
  display: block;
}

.auth-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(31, 41, 51, 0.42);
}

.auth-dialog {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(420px, calc(100vw - 28px));
  transform: translate(-50%, -50%);
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: var(--shadow);
}

.auth-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.auth-head h2 {
  margin: 0;
  font-size: 18px;
}

.auth-close {
  margin: 0;
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.auth-tab {
  border: 1px solid var(--border);
  background: #faf7f3;
}

.auth-tab.active {
  border-color: var(--accent);
  background: #eef0ff;
}

.auth-switch {
  width: 100%;
  margin-top: 8px;
}

.cloud-locked .saved-list {
  opacity: 0.55;
  pointer-events: none;
}

.turnstile-container {
  margin: 8px 0 10px;
  min-height: 65px;
}

.collapsible > h2 {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.collapsible > h2::after {
  content: "▾";
  font-size: 12px;
  color: var(--muted);
}

.collapsible.collapsed > h2::after {
  content: "▸";
}

.collapsible.collapsed > :not(h2) {
  display: none;
}

.panel h1 {
  font-size: 22px;
  margin: 0;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.panel-toggle {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #faf7f3;
  border: 1px solid var(--border);
  font-size: 16px;
}

.panel-handle {
  position: fixed;
  top: 88px;
  left: 0;
  z-index: 4;
  width: 28px;
  height: 48px;
  border-radius: 0 10px 10px 0;
  border: 1px solid var(--border);
  background: #faf7f3;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  display: none;
}

.app.menu-collapsed .panel {
  transform: none;
}

.app.menu-collapsed .panel-left {
  transform: translateX(-100%);
}

.app.menu-collapsed .panel-handle {
  display: inline-flex;
}

.center-topic {
  margin-bottom: 16px;
}

.center-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 4px;
}

.center-display {
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px dashed var(--border);
  background: #faf7f3;
  font-size: 14px;
  color: var(--ink);
}

.center-edit {
  display: none;
  width: 100%;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 14px;
}

.center-topic.editing .center-display {
  display: none;
}

.center-topic.editing .center-edit {
  display: block;
}

.panel h2 {
  font-size: 16px;
  margin: 20px 0 8px;
}

.field {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
}

.field span {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

input, select {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 14px;
}

input[type="color"] {
  padding: 6px;
  height: 42px;
  width: 100%;
  border-radius: 12px;
}

.swatches button.active {
  outline: 2px solid var(--accent);
  box-shadow: 0 0 0 2px rgba(47, 60, 126, 0.2);
}

.swatches {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin: -4px 0 12px;
}

.swatches button {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--swatch);
  cursor: pointer;
}

button {
  border: none;
  border-radius: 14px;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  color: white;
  margin-bottom: 6px;
}

button.ghost {
  background: transparent;
  border: 1px solid var(--border);
}

.hint {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--muted);
}

.tips {
  margin: 0;
  padding: 0 0 0 16px;
  font-size: 13px;
  color: var(--muted);
}

.zoom-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 6px;
}

.canvas-wrap {
  position: relative;
  overflow: hidden;
  height: 100vh;
  margin-left: 0;
}

.canvas-wrap.grid {
  background-image: radial-gradient(circle, rgba(31, 41, 51, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: center;
}

.minimap {
  position: absolute;
  right: 16px;
  bottom: 16px;
  width: 180px;
  height: 120px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  pointer-events: none;
}

.zoom-fab {
  position: absolute;
  right: 16px;
  bottom: 148px;
  display: grid;
  gap: 6px;
  z-index: 3;
}

.zoom-btn {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #faf7f3;
  font-size: 16px;
  line-height: 1;
  padding: 0;
}

.minimap.hidden {
  display: none;
}

#minimap-svg {
  width: 100%;
  height: 100%;
}

.context-menu {
  position: absolute;
  display: none;
  z-index: 6;
  min-width: 120px;
  padding: 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: var(--shadow);
}

.context-menu.open {
  display: grid;
}

.context-color-grid {
  display: grid;
  gap: 8px;
}

.color-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}

.color-chip {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 2px solid #ffffff;
  background: var(--chip);
  box-shadow: 0 0 0 1px var(--border);
  cursor: pointer;
}

.color-chip.active {
  box-shadow: 0 0 0 2px #2f3c7e;
}

.context-color-picker {
  margin-top: 8px;
  background: #faf7f3;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  text-align: left;
}

.context-color {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.saved-list {
  display: grid;
  gap: 6px;
}

.saved-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fffaf5;
  cursor: pointer;
}

.saved-title {
  font-weight: 600;
  font-size: 14px;
}

.saved-meta {
  font-size: 12px;
  color: var(--muted);
}

.saved-actions {
  display: none;
}

#canvas {
  width: 100%;
  height: 100vh;
  background: transparent;
}

.node rect {
  stroke: var(--node-stroke);
  stroke-width: 1.5px;
}

.node circle {
  stroke: var(--node-stroke);
  stroke-width: 1.5px;
}

.node.selected rect {
  stroke-width: 2.5px;
  filter: drop-shadow(0 4px 8px rgba(31, 41, 51, 0.2));
}

.node.selected circle {
  stroke-width: 2.5px;
  filter: drop-shadow(0 4px 8px rgba(31, 41, 51, 0.2));
}

.node-delete rect {
  fill: #ffffff;
  stroke: #1f2933;
  stroke-width: 1px;
}

.node-delete text {
  font-size: 12px;
  font-weight: 700;
  fill: #1f2933;
}

.node-delete {
  opacity: 0;
  transition: opacity 0.12s ease;
}

.node.selected .node-delete {
  opacity: 1;
}

.node:hover .node-delete {
  opacity: 1;
}
.cluster rect {
  stroke-width: 1.5px;
  stroke-dasharray: 6 4;
}

.cluster.selected rect {
  stroke-width: 2.5px;
  filter: drop-shadow(0 6px 10px rgba(31, 41, 51, 0.22));
}

.cluster.hover rect {
  stroke-width: 2.5px;
  stroke: #1f2933;
  filter: drop-shadow(0 8px 14px rgba(47, 60, 126, 0.28));
  animation: pulse 1.2s ease-in-out infinite alternate;
}

.cluster.hover text {
  fill: #1f2933;
}

@keyframes pulse {
  from {
    transform: scale(1);
    opacity: 0.58;
  }
  to {
    transform: scale(1.005);
    opacity: 0.68;
  }
}

.cluster-button rect {
  fill: #ffffff;
  stroke: #2c2c2c;
  stroke-width: 1.2px;
}

.cluster-button text {
  font-size: 11px;
  font-weight: 700;
}
.cluster text {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.link {
  stroke: #788a9e;
  stroke-width: 1.2px;
}

@media (max-width: 900px) {
  .auth-trigger {
    right: 68px;
    max-width: 135px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .panel {
    position: relative;
    width: 100%;
    transform: none;
    box-shadow: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .canvas-wrap {
    margin-left: 0;
  }

  .panel-handle {
    display: none;
  }

  .minimap {
    bottom: 112px;
  }

  .zoom-fab {
    bottom: 244px;
  }

  #canvas {
    height: calc(100vh - 360px);
  }
}