:root {
  --bg: #0b0f17;
  --panel-bg: #10151f;
  --border: #202a3a;
  --text: #e6ebf5;
  --text-dim: #8a97ab;
  --accent: #4fd1c5;
  --accent-dim: rgba(79, 209, 197, 0.15);
  --danger: #ff5d6c;
  --node-fill: #0b0f17;
  --node-stroke: #3a4a63;
  --radius: 10px;
}

* { box-sizing: border-box; }

/* Author rules below set `display` on several elements that are also
   toggled via the `hidden` attribute (e.g. .row, .node-type-picker).
   Author CSS always beats the UA stylesheet's `[hidden]{display:none}`
   regardless of specificity, so without this override those elements
   would stay visible while "hidden". */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 17px; margin: 0; font-weight: 600; }
.brand-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px 2px var(--accent-dim);
}

.toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.name-input { width: 220px; }

.layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 16px;
  padding: 16px;
  height: calc(100vh - 60px);
  min-height: 560px;
}

/* Grid items default to min-height:auto, which lets their intrinsic
   content size override the parent's explicit height. Without this,
   the tall side panel silently stretches .layout past 100vh. */
.layout > * { min-height: 0; }

.canvas-pane {
  position: relative;
  background: radial-gradient(circle at 30% 20%, #101a28 0%, var(--bg) 70%);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

#canvas { width: 100%; height: 100%; display: block; cursor: default; }

.mode-toolbar {
  position: absolute;
  top: 14px;
  left: 14px;
  display: flex;
  gap: 6px;
  background: rgba(11, 15, 23, 0.82);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  backdrop-filter: blur(4px);
  z-index: 2;
}

.mode-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-dim);
  font-size: 12px;
  padding: 7px 12px;
  border-radius: 7px;
  cursor: pointer;
}

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

.mode-btn[aria-pressed="true"] {
  background: var(--accent-dim);
  border-color: rgba(79, 209, 197, 0.4);
  color: var(--accent);
}

.node-type-picker {
  position: absolute;
  top: 62px;
  left: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(11, 15, 23, 0.82);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 12px;
  color: var(--text-dim);
  z-index: 2;
}

.hint-overlay {
  position: absolute;
  top: 14px;
  right: 14px;
  max-width: 320px;
  background: rgba(11, 15, 23, 0.82);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-dim);
  z-index: 2;
}

.legend-overlay {
  position: absolute;
  left: 14px;
  bottom: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  max-width: min(560px, calc(100% - 28px));
  padding: 10px 14px;
  background: rgba(11, 15, 23, 0.82);
  border: 1px solid var(--border);
  border-radius: 10px;
  backdrop-filter: blur(4px);
  z-index: 2;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--node-fill);
  border: 2px solid currentColor;
  flex-shrink: 0;
}

.side-pane {
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  padding-right: 2px;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.panel h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin: 0 0 10px;
}

.empty-state {
  font-size: 12px;
  color: var(--text-dim);
  margin: 0;
  line-height: 1.5;
}

.hint-text {
  font-size: 11px;
  color: var(--text-dim);
  margin: 0 0 10px;
  line-height: 1.5;
}

.field {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--text-dim);
}

.field span { display: block; margin-bottom: 5px; }

.text-input, .select, .json-input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #182333;
  color: var(--text);
  font-size: 13px;
}

.json-input {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 11px;
  line-height: 1.5;
  resize: vertical;
}

.select { cursor: pointer; }
.text-input:focus, .select:focus, .json-input:focus { outline: 1px solid var(--accent); }

.row { display: flex; gap: 8px; margin-bottom: 10px; }
.row > * { flex: 1; }

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #182333;
  color: var(--text);
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
}

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

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #06231f;
  font-weight: 600;
}

.btn-ghost { background: transparent; }
.full-width { width: 100%; }

.status-text {
  font-size: 12px;
  color: var(--text-dim);
  min-height: 16px;
}

.list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
}

.list-empty {
  font-size: 12px;
  color: var(--text-dim);
}

.route-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: #182333;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 12px;
}

.route-row.broken { border-color: var(--danger); }

.route-path { flex: 1; word-break: break-word; }
.route-path .broken-tag { color: var(--danger); font-size: 10px; margin-left: 6px; }

.route-delete {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 2px 6px;
}
.route-delete:hover { color: var(--danger); }

/* ---------- SVG canvas elements ---------- */

.link-line { stroke: var(--node-stroke); stroke-width: 2; }
.link-hit { stroke: transparent; stroke-width: 16; cursor: pointer; }
.link-group.selected .link-line { stroke: var(--accent); stroke-width: 3; }
.link-label {
  fill: var(--text-dim);
  font-size: 10px;
  text-anchor: middle;
  pointer-events: none;
}

.route-preview-line {
  stroke: #facc15;
  stroke-width: 3;
  stroke-dasharray: 6 5;
  fill: none;
  pointer-events: none;
}

.node-group { cursor: grab; }
.node-group:active { cursor: grabbing; }

.node-ring {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  opacity: 0;
}
.node-group.selected .node-ring { opacity: 1; }
.node-group.pending .node-ring {
  opacity: 1;
  stroke: #facc15;
  stroke-dasharray: 4 3;
}

.node-circle {
  fill: var(--node-fill);
  stroke: var(--node-stroke);
  stroke-width: 2;
}

.node-icon {
  pointer-events: none;
}
.node-icon path,
.node-icon rect,
.node-icon line,
.node-icon circle,
.node-icon ellipse {
  fill: none;
  stroke: var(--text);
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.node-icon .icon-fill {
  fill: var(--text);
  stroke: none;
}

.node-label {
  fill: var(--text);
  font-size: 12px;
  font-weight: 600;
  text-anchor: middle;
  pointer-events: none;
}

.node-sub {
  fill: var(--text-dim);
  font-size: 10px;
  text-anchor: middle;
  pointer-events: none;
}

.route-badge circle {
  fill: #facc15;
  stroke: #06231f;
  stroke-width: 1.5;
}
.route-badge text {
  fill: #06231f;
  font-size: 11px;
  font-weight: 700;
  text-anchor: middle;
  pointer-events: none;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; height: auto; }
  .side-pane { max-height: none; }
  .canvas-pane { height: 480px; }
}

/* ---------- Rotate-device prompt (mobile portrait only) ---------- */

.rotate-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(11, 15, 23, 0.97);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  text-align: center;
  padding: 24px;
}

@media (max-width: 700px) and (orientation: portrait) {
  .rotate-overlay:not(.dismissed) {
    display: flex;
  }
}

.rotate-overlay .phone-icon {
  width: 64px;
  height: 64px;
  color: var(--accent);
}

.rotate-overlay .phone-shape {
  animation: rotate-phone 1.8s ease-in-out infinite;
  transform-origin: 24px 24px;
}

@keyframes rotate-phone {
  0%, 15% { transform: rotate(0deg); }
  50%, 65% { transform: rotate(90deg); }
  100% { transform: rotate(0deg); }
}

.rotate-overlay .rotate-arrow {
  opacity: 0.7;
}

.rotate-overlay p {
  max-width: 260px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  margin: 0;
}