:root {
  --bg: #f2f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #4f46e5;
  --secondary: #e2e8f0;
  --accent: #10b981;
  --danger: #ef4444;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans";
  background: var(--bg);
  color: var(--text);
}

.header { padding: 12px 16px; display: flex; gap: 16px; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--border); background: var(--card); }
.header h1 { font-size: 20px; margin: 0; letter-spacing: .3px; }

.controls { display: grid; grid-template-columns: 1fr; gap: 8px; width: 100%; max-width: 920px; margin: 0 auto; }
.row { display: grid; grid-template-columns: 1fr 1fr 1fr auto; gap: 8px; align-items: end; }
.row-ab { grid-template-columns: 1fr auto 1fr; }
.arrow { align-self: center; font-size: 20px; color: var(--muted); padding: 0 4px; }
.row-options { grid-template-columns: 1fr 1fr auto; }
@media (max-width: 860px) { .row { grid-template-columns: 1fr; } }

.input { position: relative; }
label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
input[type="text"], select {
  width: 100%; padding: 10px 12px; background: #fff; color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
}
.suggest { position: absolute; z-index: 1000; top: 64px; left: 0; right: 0; background: var(--card); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 10px 20px rgba(2, 6, 23, 0.06); overflow: hidden; }
.suggest.hidden { display: none; }
.suggest-item { padding: 8px 10px; cursor: pointer; }
.suggest-item:hover { background: var(--secondary); }

.actions { display: flex; gap: 8px; justify-content: flex-end; }
.btn { padding: 10px 14px; border-radius: 10px; border: 1px solid transparent; cursor: pointer; font-weight: 600; }
.btn.accent { background: var(--accent); color: #ffffff; }
.btn.secondary { background: var(--secondary); color: var(--text); }
.btn.big { font-size: 18px; padding: 14px 18px; width: 100%; }

.layout { display: grid; grid-template-columns: 1fr; gap: 16px; padding: 16px; max-width: 920px; margin: 0 auto; }
#map { width: 100%; height: 60vh; border-radius: 12px; border: 1px solid var(--border); }
.means { display: inline-flex; gap: 8px; }
.means-btn { background: var(--secondary); color: var(--text); border: 1px solid var(--border); padding: 8px 10px; border-radius: 10px; cursor: pointer; }
.means-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

details.advanced { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; }
details.advanced summary { cursor: pointer; color: var(--muted); outline: none; }
.hint { color: var(--muted); margin-top: 8px; font-size: 12px; }
.info-panel { display: flex; flex-direction: column; gap: 12px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 16px; box-shadow: 0 10px 20px rgba(2, 6, 23, 0.06); }
.card.small { font-size: 12px; color: var(--muted); }
.kv { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 12px; font-size: 14px; }
.kv dt { color: var(--muted); }
.result { font-weight: 700; font-size: 16px; }
.answer { text-align: center; }
.answer-head { font-size: 24px; font-weight: 800; }
.answer-head.ok { color: var(--accent); }
.answer-head.bad { color: var(--danger); }
.answer-sub { margin-top: 6px; color: var(--muted); }
.hidden { display: none; }

@media (max-width: 860px) { #map { height: 50vh; } }