*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.45 var(--font);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 0;
  min-height: 100vh;
}

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

.top {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.top h1 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--head);
}

.top .kicker {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--rust);
}

.top a {
  margin-left: auto;
  color: var(--rust);
  text-decoration: none;
  font-size: 0.9rem;
}

.top a:hover {
  text-decoration: underline;
}

.stage-wrap {
  position: relative;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 20% 10%, rgba(180, 69, 26, 0.06), transparent 40%),
    var(--paper);
}

#stage {
  display: block;
  width: 100%;
  max-width: 960px;
  height: auto;
  aspect-ratio: 960 / 640;
  border: 1px solid var(--line);
  background: var(--street);
  box-shadow: 0 2px 12px rgba(22, 20, 16, 0.08);
}

.sidebar {
  border-left: 1px solid var(--line);
  background: var(--panel);
  padding: 1rem 1.1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  overflow-y: auto;
}

@media (max-width: 900px) {
  .sidebar {
    border-left: none;
    border-top: 1px solid var(--line);
  }
}

.panel-section h2 {
  margin: 0 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--mono);
}

.control {
  margin-bottom: 0.85rem;
}

.control label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.88rem;
  margin-bottom: 0.35rem;
}

.control label span {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--rust);
}

.control input[type="range"] {
  width: 100%;
  accent-color: var(--rust);
}

.control-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

button {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 0.45rem 0.75rem;
  border-radius: 2px;
}

button:hover {
  border-color: var(--rust);
}

button.primary {
  background: var(--rust);
  border-color: var(--rust);
  color: #fff;
}

button.primary:hover {
  filter: brightness(1.05);
}

button.active {
  background: var(--rust-soft);
  border-color: var(--rust);
}

.seed-row {
  display: flex;
  gap: 0.5rem;
}

.seed-row input[type="number"] {
  flex: 1;
  min-width: 0;
  font: 0.85rem var(--mono);
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 2px;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.stat {
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  background: #fff;
}

.stat .val {
  display: block;
  font-family: var(--mono);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--head);
}

.stat .lbl {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

#chart {
  display: block;
  width: 100%;
  height: 72px;
  border: 1px solid var(--line);
  background: #fff;
}

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