:root {
  color-scheme: light;
  --bg: #edf1ee;
  --rail: #fbfcfa;
  --ink: #171b20;
  --muted: #64707c;
  --line: #d3d9d1;
  --teal: #0e6f76;
  --teal-soft: #dceeed;
  --gold: #9b6a18;
  --rose: #9b4d55;
  --scene: #f7f8f5;
}

* {
  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;
}

button,
select {
  font: inherit;
}

.plateau-app {
  display: grid;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  min-height: 100vh;
}

.control-rail {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
  border-right: 1px solid var(--line);
  background: var(--rail);
  padding: 22px;
  overflow-y: auto;
}

.brand-block h1 {
  margin: 8px 0 8px;
  font-size: 23px;
  line-height: 1.14;
  letter-spacing: 0;
}

.brand-block p,
.scene-title p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.back-link {
  color: var(--teal);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

.field {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 0 10px;
}

.file-mode-warning {
  margin: -8px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.file-mode-warning a {
  color: var(--teal);
  font-weight: 700;
}

.switch-stack {
  display: grid;
  gap: 10px;
  color: var(--ink);
  font-size: 13px;
}

.switch-stack label {
  display: flex;
  align-items: center;
  gap: 9px;
}

.switch-stack input {
  width: 16px;
  height: 16px;
  accent-color: var(--teal);
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.action-row button,
.source-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}

.action-row button:hover,
.source-button:hover {
  border-color: var(--teal);
  background: var(--teal-soft);
}

.live-panel {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 13px;
}

.section-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.range-field {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.range-field span {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.range-field output {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.live-panel input[type="range"] {
  accent-color: var(--teal);
}

#resetLiveMesh {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

#resetLiveMesh:hover {
  border-color: var(--teal);
  background: var(--teal-soft);
}

.details {
  display: grid;
  grid-template-columns: minmax(96px, auto) minmax(0, 1fr);
  gap: 9px 12px;
  margin: 0;
  font-size: 13px;
}

.details dt {
  color: var(--muted);
}

.details dd {
  margin: 0;
  min-width: 0;
  word-break: break-word;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  color: var(--muted);
  font-size: 12px;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  display: inline-block;
  width: 13px;
  height: 13px;
  border-radius: 50%;
}

.swatch.film {
  background: #4fa3a9;
}

.swatch.boundary {
  background: #171b20;
}

.swatch.junction {
  background: var(--gold);
}

.scene-panel {
  position: relative;
  min-width: 0;
  min-height: 100vh;
  overflow: hidden;
  background: linear-gradient(150deg, #fbfbf8 0%, var(--scene) 52%, #e7ebe5 100%);
}

#sceneCanvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 100vh;
}

.scene-title {
  position: absolute;
  left: 28px;
  right: 28px;
  top: 24px;
  max-width: 740px;
  pointer-events: none;
}

.scene-title h2 {
  margin: 0 0 6px;
  font-size: 24px;
  line-height: 1.18;
  letter-spacing: 0;
}

.error-box {
  position: absolute;
  left: 28px;
  right: 28px;
  bottom: 28px;
  max-width: 720px;
  border: 1px solid #d7a0a5;
  border-radius: 8px;
  background: #fff6f7;
  color: #7a2630;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.45;
}

.is-hidden {
  display: none !important;
}

@media (max-width: 920px) {
  .plateau-app {
    grid-template-columns: 1fr;
  }

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

  .scene-panel,
  #sceneCanvas {
    min-height: 70vh;
  }

  .scene-title {
    left: 18px;
    right: 18px;
    top: 18px;
  }
}