/* High-contrast, walking-friendly UI (no frameworks). */
:root {
  --bg: #0b0b0c;
  --panel: #141417;
  --panel2: #101014;
  --text: #f3f3f6;
  --muted: #b8b8c3;
  --danger: #ff3b30;
  --good: #34c759;
  --accent: #0a84ff;
  --border: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: radial-gradient(1200px 1200px at 20% -10%, #1c1d2a 0%, var(--bg) 55%);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.app {
  max-width: 560px;
  margin: 0 auto;
  padding: 18px 16px 28px;
}

.header h1 {
  margin: 4px 0 6px;
  font-size: 28px;
  letter-spacing: 0.2px;
}

.subtitle {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.35;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 14px 0 10px;
}

.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.18);
  font-size: 14px;
  font-weight: 750;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 12px;
}

.routes {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  margin: 10px 0 12px;
}

.routes-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 4px 0 10px;
}

.routes-top h2 {
  margin: 0;
  font-size: 16px;
  letter-spacing: 0.2px;
}

.routes-list {
  margin: 0;
  padding-left: 20px;
}

.route {
  margin: 10px 0;
  padding: 10px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.route.selected {
  border-color: rgba(10, 132, 255, 0.75);
  background: rgba(10, 132, 255, 0.10);
}

.route-btn {
  width: 100%;
  text-align: left;
  color: var(--text);
  background: transparent;
  border: none;
  padding: 0;
  font: inherit;
}

.route-title {
  font-weight: 850;
  margin-bottom: 4px;
}

.route-sub {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.3;
}

.btn {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 14px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.2px;
  background: var(--panel);
  color: var(--text);
  min-height: 58px;
  touch-action: manipulation;
}

.btn:active {
  transform: translateY(1px);
}

.btn[disabled] {
  opacity: 0.45;
}

.btn-primary {
  background: linear-gradient(180deg, rgba(10, 132, 255, 0.35), rgba(10, 132, 255, 0.15));
  border-color: rgba(10, 132, 255, 0.55);
}

.btn-danger {
  background: linear-gradient(180deg, rgba(255, 59, 48, 0.35), rgba(255, 59, 48, 0.12));
  border-color: rgba(255, 59, 48, 0.6);
}

.status {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 12px;
  margin: 10px 0 12px;
}

.status-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 10px;
  padding: 8px 4px;
}

.status-label {
  color: var(--muted);
  font-weight: 650;
  font-size: 13px;
  letter-spacing: 0.2px;
  text-transform: uppercase;
}

.status-value {
  font-size: 15px;
  line-height: 1.35;
}

.error {
  margin-top: 10px;
  padding: 10px 10px;
  border-radius: 12px;
  background: rgba(255, 59, 48, 0.14);
  border: 1px solid rgba(255, 59, 48, 0.5);
  color: #ffd8d6;
  white-space: pre-wrap;
}

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 8px 0 14px;
}

.metric {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 12px;
}

.metric-label {
  color: var(--muted);
  font-weight: 650;
  font-size: 13px;
  letter-spacing: 0.2px;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.metric-value {
  font-size: 18px;
  font-weight: 750;
}

.spacer {
  display: inline-block;
  width: 10px;
}

.preview {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  margin: 10px 0 14px;
}

.preview h2,
.nodes h2 {
  margin: 4px 0 10px;
  font-size: 16px;
  letter-spacing: 0.2px;
}

#routeCanvas {
  width: 100%;
  height: auto;
  display: block;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 12px;
}

.hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.nodes {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
}

.empty {
  color: var(--muted);
  padding: 10px 2px 4px;
}

.nodes-list {
  margin: 0;
  padding-left: 20px;
}

.node {
  margin: 10px 0;
  padding: 10px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.node-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
}

.node-title {
  font-weight: 800;
}

.node-meta {
  color: var(--muted);
  font-size: 13px;
}

.node-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 10px;
  margin: 8px 0 10px;
  color: #d6d6e1;
  font-size: 14px;
}

.kv {
  display: flex;
  gap: 8px;
}

.k {
  color: var(--muted);
  min-width: 66px;
}

.footer {
  margin-top: 14px;
}

.footnote {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.35;
}