:root {
  color-scheme: light;
  --bg-1: #eef3f0;
  --bg-2: #dbe4df;
  --ink-1: #0f1a18;
  --ink-2: #263532;
  --panel: #f7faf8;
  --panel-border: rgba(15, 26, 24, 0.15);
  --accent: #1f6f8b;
  --accent-2: #d46c4e;
  --accent-3: #7c9f7c;
  --shadow: 0 18px 40px rgba(15, 26, 24, 0.15);
  --glow: 0 0 0 1px rgba(255, 255, 255, 0.6) inset;
  --mono: "IBM Plex Mono", "JetBrains Mono", "SF Mono", monospace;
  --sans: "Space Grotesk", "IBM Plex Sans", "Avenir Next", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink-1);
  background: radial-gradient(1200px 600px at 80% 20%, rgba(31, 111, 139, 0.15), transparent 60%),
    radial-gradient(900px 500px at 10% 80%, rgba(212, 108, 78, 0.12), transparent 60%),
    linear-gradient(145deg, var(--bg-1), var(--bg-2));
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(15, 26, 24, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 26, 24, 0.04) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px;
  pointer-events: none;
  opacity: 0.35;
}

.topbar {
  padding: 28px clamp(20px, 4vw, 48px);
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(240px, 1.2fr) minmax(260px, 1fr) minmax(200px, 0.8fr);
  align-items: center;
  animation: float-in 0.8s ease both;
}

.brand h1 {
  margin: 6px 0 8px;
  font-size: clamp(1.8rem, 2.5vw, 2.6rem);
  letter-spacing: -0.02em;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.7rem;
  color: var(--accent);
  margin: 0;
}

.subtitle {
  margin: 0;
  color: var(--ink-2);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  box-shadow: var(--glow);
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(15, 26, 24, 0.35);
  box-shadow: 0 10px 20px rgba(15, 26, 24, 0.15);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), #2e94b9);
  color: white;
  border: none;
}

.btn.ghost {
  background: transparent;
}

.btn.tiny {
  padding: 6px 12px;
  font-size: 0.82rem;
}

.metrics {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.metric {
  background: rgba(247, 250, 248, 0.8);
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid rgba(15, 26, 24, 0.12);
  box-shadow: var(--glow);
}

.metric output {
  display: block;
  font-family: var(--mono);
  font-size: 1.2rem;
  margin-top: 4px;
}

.label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-2);
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 1.5fr) minmax(300px, 1fr);
  gap: 24px;
  padding: 0 clamp(20px, 4vw, 48px) 40px;
}

.sim-panel {
  min-height: 500px;
}

.canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 24px;
  background: linear-gradient(160deg, #101919, #1b2422);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
  overflow: hidden;
}

#world {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: inherit;
}

.hud {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.chip {
  background: rgba(255, 255, 255, 0.12);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-family: var(--mono);
}

.popover {
  border: 1px solid rgba(15, 26, 24, 0.2);
  border-radius: 16px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
  background: var(--panel);
}

.popover h3 {
  margin: 0 0 8px;
}

.popover ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 6px;
}

.popover li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.swatch {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: inline-block;
  position: relative;
}

.swatch.field { background: #2f6b4f; }
.swatch.hill { background: #8a6b3d; }
.swatch.building { background: #4c4c4c; }
.swatch.master { background: #1f6f8b; }
.swatch.robot { background: linear-gradient(135deg, #3ddad7, #f2c14e); }

.swatch {
  border: 1px solid rgba(15, 26, 24, 0.2);
}

.legend-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.bot-popover {
  position: fixed;
  min-width: 160px;
}

.bot-title {
  margin: 0;
  font-weight: 600;
}

.bot-sub {
  margin: 4px 0 0;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-2);
}

.side {
  display: grid;
  gap: 16px;
  align-content: start;
}

.card {
  background: var(--panel);
  border-radius: 18px;
  border: 1px solid var(--panel-border);
  box-shadow: var(--glow);
  padding: 0;
  overflow: hidden;
  animation: rise 0.7s ease both;
}

.card summary {
  cursor: pointer;
  font-weight: 600;
  padding: 14px 18px;
  list-style: none;
}

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

.card[open] summary {
  border-bottom: 1px solid rgba(15, 26, 24, 0.08);
}

.card-body {
  padding: 16px 18px 20px;
  display: grid;
  gap: 14px;
}

.field label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: var(--ink-2);
}

.range-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  align-items: center;
}

.range-row output {
  font-family: var(--mono);
}

.seed-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

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

.select {
  width: 100%;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(15, 26, 24, 0.2);
  background: white;
  font-family: var(--sans);
}

.toggles {
  border: 1px dashed rgba(15, 26, 24, 0.2);
  border-radius: 12px;
  padding: 10px 12px 12px;
  display: grid;
  gap: 8px;
}

.toggle {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.9rem;
}

.meters {
  display: grid;
  gap: 12px;
}

meter {
  width: 100%;
  height: 12px;
}

.log {
  margin: 0;
  padding-left: 18px;
  font-size: 0.85rem;
  color: var(--ink-2);
  display: grid;
  gap: 6px;
}

#chart {
  width: 100%;
  height: 140px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(31, 111, 139, 0.12), rgba(212, 108, 78, 0.1));
  display: block;
}

.dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.dialog-body ul {
  padding-left: 18px;
}

dialog {
  border: none;
  border-radius: 18px;
  padding: 20px 24px 24px;
  box-shadow: var(--shadow);
  max-width: 520px;
  width: min(520px, 90vw);
}

dialog::backdrop {
  background: rgba(15, 26, 24, 0.5);
}

.muted {
  color: var(--ink-2);
  margin: 0;
}

.robot-card h3 {
  margin: 0 0 6px;
}

.robot-portrait {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: center;
}

.robot-canvas {
  width: 160px;
  height: 120px;
  border-radius: 12px;
  border: 1px solid rgba(15, 26, 24, 0.15);
  background: #f1f5f2;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 12px;
}

.stat-grid div {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--ink-2);
}

.stat-grid strong {
  font-family: var(--mono);
  color: var(--ink-1);
}

.gene-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.gene-chip {
  background: rgba(31, 111, 139, 0.12);
  border-radius: 10px;
  padding: 6px 8px;
  font-size: 0.75rem;
  color: var(--ink-2);
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.gene-chip strong {
  font-family: var(--mono);
  color: var(--ink-1);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@keyframes float-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 980px) {
  .topbar {
    grid-template-columns: 1fr;
  }

  .layout {
    grid-template-columns: 1fr;
  }
}