:root {
  --bg-top: #141d31;
  --bg-bottom: #23334d;
  --panel: #f1f5f6;
  --ink: #172532;
  --muted: #5b6c76;
  --accent: #f25d27;
  --accent-soft: #f8c6b2;
  --line: #c7d2d8;
  --ok: #1f8f58;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  background: linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
  min-height: 100vh;
}

.topbar {
  padding: 16px 20px;
  color: #f7f8f9;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.topbar h1 {
  margin: 0;
  letter-spacing: 0.08em;
  font-size: 1.6rem;
}

.topbar p {
  margin: 6px 0 0;
  color: #d9e1e5;
  font-size: 0.95rem;
}

.app-grid {
  display: grid;
  grid-template-columns: 360px minmax(640px, 1fr);
  gap: 16px;
  padding: 16px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 12px;
  box-shadow: 0 8px 28px rgba(8, 11, 15, 0.22);
}

.controls {
  padding: 14px;
  max-height: calc(100vh - 110px);
  overflow: auto;
}

.toolbar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}

button {
  border: 1px solid #c7d0d8;
  background: #ffffff;
  color: #13202a;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  padding: 9px 10px;
}

button:hover {
  border-color: #8da2b2;
}

.group {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  margin-bottom: 10px;
  background: #ffffff;
}

.group h2 {
  margin: 0 0 8px;
  font-size: 0.95rem;
  color: #0f2940;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

.control {
  min-width: 0;
}

.control label {
  margin: 0 0 3px;
  font-size: 0.76rem;
  line-height: 1.2;
}

label {
  display: block;
  font-size: 0.83rem;
  color: var(--muted);
  margin: 7px 0 4px;
}

.switch-grid {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 10px;
}

.switch-line {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: #213845;
  font-size: 0.79rem;
  line-height: 1.2;
}

.switch-line.full-row {
  grid-column: 1 / -1;
}

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

input[type="number"] {
  width: 100%;
  min-width: 0;
  border: 1px solid #c3cfd7;
  border-radius: 6px;
  padding: 5px 7px;
  font-size: 0.84rem;
  color: #17313f;
  background: #ffffff;
}

.sim {
  padding: 14px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.92rem;
  margin-bottom: 8px;
}

#status-text {
  color: var(--ok);
  font-weight: 600;
}

#tick-text {
  color: #355168;
}

#world-canvas {
  width: min(100%, 720px);
  height: auto;
  aspect-ratio: 860 / 680;
  border: 1px solid #b7c3cb;
  border-radius: 10px;
  background: #2f7d4b;
  display: block;
  margin: 0 auto;
  image-rendering: crisp-edges;
}

.monitor-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 8px;
}

.monitor-grid article {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
}

.monitor-grid h3 {
  margin: 0;
  font-size: 0.78rem;
  color: #536775;
  font-weight: 600;
}

.monitor-grid p {
  margin: 5px 0 0;
  font-size: 1.04rem;
  font-weight: 700;
  color: #0f2131;
}

.chart-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.chart-grid canvas {
  width: 100%;
  height: auto;
  border: 1px solid #becad0;
  border-radius: 8px;
  background: #ffffff;
}

#trend-canvas {
  grid-column: 1 / -1;
}

@media (max-width: 1260px) {
  .app-grid {
    grid-template-columns: 1fr;
  }

  .controls {
    max-height: none;
  }
}

@media (max-width: 780px) {
  .group-grid,
  .switch-grid {
    grid-template-columns: 1fr;
  }

  .monitor-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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