:root {
  --ink: #1c2420;
  --muted: #5d6a63;
  --line: rgba(28, 36, 32, 0.12);
  --panel: #f6f1e6;
  --accent: #8a5a12;
  --you: #0f6e56;
  --rail-w: 300px;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --display: "Libre Baskerville", Georgia, serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: var(--sans);
  color: var(--ink);
  background: #e4ddd0;
}

a { color: var(--you); }

.app {
  display: grid;
  grid-template-columns: var(--rail-w) 1fr;
  height: 100vh;
  height: 100dvh;
}

.rail {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--panel);
  border-right: 1px solid var(--line);
  z-index: 5;
}

.rail__brand {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem 0.7rem;
  border-bottom: 1px solid var(--line);
}

.rail__brand > div {
  display: flex;
  flex-direction: column;
  gap: 0.08rem;
}

.rail__brand a {
  font-size: 0.72rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--muted);
}

.rail__brand strong {
  font-family: var(--display);
  font-size: 1.22rem;
  line-height: 1.15;
}

.rail-close {
  display: none;
  margin-left: auto;
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 0.12rem 0.45rem;
  font: inherit;
  cursor: pointer;
}

.rail__section {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
}

.rail__section--controls {
  display: grid;
  gap: 0.55rem;
}

.rail__section--detail {
  flex: 1 1 auto;
  overflow: auto;
  min-height: 8rem;
}

.rail__section--legend {
  flex: 0 1 auto;
  overflow: auto;
  max-height: 34vh;
}

.rail:not(.rail--gap) .gap-metrics {
  display: none;
}

.rail--gap .rail__filters {
  display: none;
}

.rail--gap .legend {
  grid-template-columns: 1fr;
}

.rail__label {
  margin: 0 0 0.35rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.rail__hint,
.muted {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
}

.search {
  display: flex;
  gap: 0.35rem;
  align-items: stretch;
}

.search input {
  flex: 1;
  min-width: 0;
  height: 2.25rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 0.55rem;
  font: inherit;
  font-size: 0.86rem;
}

.search button {
  appearance: none;
  height: 2.25rem;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0 0.75rem;
  cursor: pointer;
}

.modes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.modes button {
  appearance: none;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.42rem 0.4rem;
  cursor: pointer;
}

.modes button + button {
  border-left: 1px solid var(--line);
}

.modes button.is-on {
  background: var(--ink);
  color: #fff;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.28rem;
}

.filters button {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.26rem 0.5rem;
  cursor: pointer;
}

.filters button.is-on {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.detail h2 {
  margin: 0.12rem 0 0;
  font-family: var(--display);
  font-size: 1.12rem;
  line-height: 1.25;
}

.detail .code {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 0.82rem;
}

.meaning {
  margin: 0.5rem 0 0;
  font-size: 0.84rem;
  line-height: 1.45;
}

.meaning--alt {
  color: var(--muted);
  font-size: 0.8rem;
}

.gap {
  margin: 0.6rem 0 0;
  padding: 0.55rem 0.6rem;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.gap__title {
  margin: 0;
  font-weight: 700;
  font-size: 0.8rem;
}

.gap__tag {
  margin-left: 0.3rem;
  font-weight: 600;
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

.gap__formula,
.gap__line {
  margin: 0.3rem 0 0;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--muted);
}

.gap .kv {
  margin-top: 0.35rem;
}

.kv {
  margin: 0.55rem 0 0;
  padding: 0;
  list-style: none;
}

.kv li {
  display: grid;
  grid-template-columns: 7.2rem 1fr;
  gap: 0.35rem;
  padding: 0.22rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
}

.kv span {
  color: var(--muted);
}

.detail__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  margin: 0.65rem 0 0;
  font-size: 0.8rem;
  font-weight: 600;
}

.legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.16rem 0.55rem;
}

.legend__group {
  grid-column: 1 / -1;
  margin: 0.32rem 0 0.02rem;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
}

.legend__group:first-child {
  margin-top: 0;
}

.legend li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.74rem;
}

.swatch {
  width: 0.78rem;
  height: 0.78rem;
  border: 1px solid rgba(28, 36, 32, 0.25);
  flex: 0 0 auto;
}

.rail__foot {
  padding: 0.55rem 1rem 0.8rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.4;
}

.rail__foot summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.rail__foot summary::-webkit-details-marker {
  display: none;
}

.rail__foot summary::after {
  content: " +";
  font-weight: 500;
  color: var(--muted);
}

.rail__foot details[open] summary::after {
  content: " –";
}

.rail__foot p {
  margin: 0.4rem 0 0;
}

.map-pane {
  position: relative;
  min-width: 0;
  z-index: 1;
}

.map {
  height: 100%;
  background: #d9e2d6;
}

.leaflet-container.is-lots {
  cursor: pointer;
}

.map-status {
  position: absolute;
  left: 0.7rem;
  bottom: 0.7rem;
  z-index: 500;
  margin: 0;
  padding: 0.28rem 0.5rem;
  background: rgba(246, 241, 230, 0.92);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 0.72rem;
  color: var(--muted);
}

.rail-toggle {
  display: none;
  position: absolute;
  top: 0.7rem;
  left: 0.7rem;
  z-index: 1000;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
  font: inherit;
  cursor: pointer;
}

.parcel-line {
  stroke: #1c2420;
  stroke-width: 2;
  fill: #8a5a12;
  fill-opacity: 0.28;
}

@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .rail {
    position: absolute;
    inset: 0 auto 0 0;
    width: min(300px, 92vw);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    box-shadow: 8px 0 24px rgba(28, 36, 32, 0.12);
    z-index: 20;
  }
  .rail.is-open { transform: none; }
  .rail-toggle { display: block; }
  .rail-close { display: inline-block; }
  .app:has(.rail.is-open) .rail-toggle { display: none; }
}