:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --ink: #17202a;
  --muted: #667085;
  --line: #d8dee7;
  --panel: #ffffff;
  --robot: #0f766e;
  --accent: #2563eb;
  --obstacle: #202833;
  --trail: #d97706;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  min-height: 100vh;
}

.map-area {
  display: grid;
  place-items: center;
  padding: 24px;
  min-width: 0;
}

#mapCanvas {
  width: min(100%, calc(100vh - 48px));
  max-width: 920px;
  aspect-ratio: 1;
  height: auto;
  background: #eef2f6;
  border: 1px solid var(--line);
}

.panel {
  border-left: 1px solid var(--line);
  background: var(--panel);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
}

.badge {
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 4px 8px;
  font-size: 12px;
  text-transform: uppercase;
}

.badge.ok {
  color: #047857;
  border-color: #86efac;
  background: #ecfdf5;
}

.badge.err {
  color: #b91c1c;
  border-color: #fecaca;
  background: #fef2f2;
}

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

.metrics div {
  border: 1px solid var(--line);
  padding: 12px;
  min-height: 74px;
}

dt {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 8px;
}

dd {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.source {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  display: grid;
  gap: 6px;
}

.source span {
  color: var(--muted);
  font-size: 12px;
}

.source strong {
  font-size: 14px;
  overflow-wrap: anywhere;
}

.legend {
  margin-top: auto;
  display: grid;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
}

.legend span {
  display: flex;
  align-items: center;
  gap: 8px;
}

.legend i {
  width: 14px;
  height: 14px;
  display: inline-block;
  border: 1px solid var(--line);
}

.legend .robot {
  background: var(--robot);
}

.legend .obstacle {
  background: var(--obstacle);
}

.legend .unknown {
  background: #d8dee7;
}

.legend .trail {
  background: var(--trail);
}

@media (max-width: 860px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .panel {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .map-area {
    padding: 12px;
  }

  #mapCanvas {
    width: 100%;
  }
}

/* --- Vehicle control panel --- */
.controls {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 12px;
}
.control-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
}
.switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.control-head .step input {
  width: 52px;
  margin: 0 4px;
  padding: 3px 6px;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.pad {
  display: grid;
  justify-items: center;
  gap: 6px;
}
.pad-mid {
  display: flex;
  gap: 6px;
}
.rotate-row {
  display: flex;
  gap: 8px;
}
.rotate-row .btn {
  flex: 1;
}
.btn {
  min-width: 76px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s, transform 0.05s;
}
.btn:hover { background: #eef2f6; }
.btn:active { transform: scale(0.96); }
.btn.stop {
  background: #b91c1c;
  border-color: #b91c1c;
  color: #fff;
}
.btn.ghost {
  background: transparent;
  color: var(--muted);
  min-width: auto;
}
.control-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.cmd-status {
  font-size: 12px;
  color: var(--muted);
}
.cmd-status.ok { color: var(--robot); }
.cmd-status.err { color: #b91c1c; }
.cmd-status.pending { color: var(--accent); }
.cmd-status.warn { color: #b45309; }