:root {
  --red: #a51c30;
  --red-dark: #7c1323;
  --ink: #252525;
  --muted: #6b6b6b;
  --line: #dedede;
  --road: #c7c7c7;
  --paper: #ffffff;
  --canvas: #fbfbfb;
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: #f6f6f4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
}

button, select { font: inherit; }

.app-shell {
  width: min(1480px, calc(100vw - 36px));
  min-height: calc(100vh - 36px);
  margin: 18px auto;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--paper);
  border: 1px solid #d2d2d2;
  border-radius: 14px;
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.topbar {
  min-height: 104px;
  padding: 25px 32px 20px;
  display: flex;
  justify-content: space-between;
  align-items: start;
  border-bottom: 1px solid var(--line);
}

h1, h2, p { margin: 0; }

h1 {
  color: var(--red);
  font-size: clamp(23px, 2.2vw, 31px);
  letter-spacing: 0.02em;
}

.topbar p { margin-top: 6px; color: var(--muted); font-size: 14px; }

.text-button, .secondary-button {
  appearance: none;
  border: 1px solid var(--red);
  background: transparent;
  color: var(--red);
  border-radius: 7px;
  cursor: pointer;
}

.text-button { padding: 8px 13px; }
.secondary-button { width: 100%; padding: 10px 12px; margin-top: 18px; }
.text-button:hover, .secondary-button:hover { background: #fff4f5; }

.workspace {
  min-height: 620px;
  display: grid;
  grid-template-columns: 278px minmax(0, 1fr);
}

.sidebar {
  padding: 26px 22px;
  border-right: 1px solid var(--line);
  background: #fcfcfc;
}

.control-group h2, .metrics h2 {
  margin-bottom: 18px;
  font-size: 17px;
}

label {
  display: block;
  margin: 14px 0 7px;
  font-size: 14px;
  color: #454545;
}

select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid #cfcfcf;
  border-radius: 7px;
  background: white;
  color: var(--ink);
}

.metrics {
  margin-top: 34px;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
}

.metrics h2 { margin-bottom: 9px; }
.metrics dl { margin: 0; }
.metrics dl div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid #ececec;
}
.metrics dt { color: var(--muted); font-size: 13px; }
.metrics dd { margin: 0; font-size: 13px; font-variant-numeric: tabular-nums; }

.help-text { margin-top: 22px; color: var(--muted); font-size: 12px; line-height: 1.7; }
.query-status { min-height: 18px; margin: 5px 0 12px; color: var(--muted); font-size: 12px; line-height: 1.45; }
.query-row { display: flex; gap: 8px; }
.query-row input { min-width: 0; flex: 1; }
.query-row button { flex: 0 0 auto; padding: 9px 12px; }
.primary-button { width: 100%; margin-top: 8px; border: 1px solid var(--red); background: var(--red); color: white; }
.search-results { display: grid; gap: 7px; margin: 0 0 14px; }
.search-result { padding: 9px; border: 1px solid #e5e5e5; background: #fafafa; }
.search-result-name { display: block; color: #242424; font-size: 13px; font-weight: 650; }
.search-result-meta { display: block; margin-top: 2px; color: var(--muted); font-size: 11px; }
.search-result-actions { display: flex; gap: 6px; margin-top: 8px; }
.search-result-actions button { flex: 1; padding: 6px 7px; font-size: 11px; }

.map-panel { position: relative; min-width: 0; min-height: 620px; background: var(--canvas); }
#map-canvas { display: block; width: 100%; height: 100%; cursor: grab; }
#map-canvas.dragging { cursor: grabbing; }

.loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.86);
}

.loading[hidden] { display: none; }

.hover-label {
  position: absolute;
  max-width: 230px;
  padding: 6px 9px;
  border-radius: 6px;
  background: #252525;
  color: white;
  font-size: 12px;
  pointer-events: none;
  transform: translate(12px, 12px);
}

.north-arrow {
  position: absolute;
  top: 20px;
  right: 22px;
  display: grid;
  justify-items: center;
  gap: 3px;
  width: 32px;
  color: #333;
  font-size: 12px;
  font-weight: 700;
  pointer-events: none;
}
.north-arrow i {
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 21px solid var(--red);
  transform: rotate(20.5deg);
  transform-origin: 50% 66%;
}

.legend {
  min-height: 68px;
  padding: 18px 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 15px 28px;
  align-items: center;
  border-top: 1px solid var(--line);
  color: #555;
  font-size: 13px;
}

.legend span { display: inline-flex; align-items: center; gap: 7px; }
.attribution { margin-left: auto; color: #777; }
.line { width: 30px; height: 2px; display: inline-block; background: var(--road); }
.dot { width: 12px; height: 12px; display: inline-block; border-radius: 50%; }
.start { background: var(--red); }
.end { background: white; border: 3px solid var(--red); }
.poi { background: white; border: 2px solid #656565; }

@media (max-width: 760px) {
  .app-shell { width: 100%; min-height: 100vh; margin: 0; border: 0; border-radius: 0; }
  .topbar { padding: 20px; }
  .workspace { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--line); }
  .map-panel { min-height: 520px; }
  .legend { padding: 16px 20px; }
  .attribution { margin-left: 0; }
}