:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --ink: #102a43;
  --muted: #486581;
  --accent: #0f766e;
  --error: #b42318;
  --border: #d9e2ec;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: radial-gradient(circle at 20% 20%, #e4f0ff, var(--bg));
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
}

.layout {
  display: grid;
  grid-template-columns: 330px 1fr;
  height: 100vh;
}

.panel {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 16px;
  overflow: auto;
  user-select: none;
}

.panel h1 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

.reverse-output {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 10px;
  background: #f7fffd;
  font-size: 0.95rem;
  line-height: 1.4;
  user-select: text;
}

.reverse-output * {
  user-select: text;
}

.reverse-output.error {
  border-left-color: var(--error);
  background: #fff6f6;
}

.results-source {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 2px;
}

.toggle-row {
  margin-top: 12px;
  font-size: 0.93rem;
  color: var(--muted);
}

.toggle-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.toggle-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
}

.map {
  width: 100%;
  height: 100%;
}

.popup-list {
  margin: 8px 0 0;
  padding-left: 18px;
}

.popup-list li {
  margin: 3px 0;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .panel {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}