:root {
  color-scheme: dark;
  --bg: #0b0f17;
  --panel: #121826;
  --line: #243049;
  --text: #e6ebf5;
  --muted: #8b97b3;
  --accent: #4cc2ff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

header { padding: 20px 16px 4px; max-width: 1400px; margin: 0 auto; }
h1 { margin: 0 0 4px; font-size: 1.5rem; }
header p { margin: 0; color: var(--muted); }

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 16px;
  padding: 16px;
  max-width: 1400px;
  margin: 0 auto;
}

.canvas-wrap { position: relative; }
#view {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #05070c;
}
#toast {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  background: rgba(18, 24, 38, 0.95);
  border: 1px solid var(--line);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
}

.legend { margin-top: 10px; }
#legend { display: block; width: 100%; height: 10px; border-radius: 5px; }
.legend-labels { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--muted); margin-top: 4px; }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 14px; }
.metrics div { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.metrics span { display: block; font-size: 0.72rem; color: var(--muted); }
.metrics b { font-size: 1.3rem; font-variant-numeric: tabular-nums; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-self: start;
}
.panel label { display: flex; flex-direction: column; gap: 6px; font-size: 0.85rem; color: var(--muted); }
.row { display: flex; justify-content: space-between; }
output { color: var(--text); font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: var(--accent); }

select, button {
  font: inherit;
  color: var(--text);
  background: #1a2336;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
}
button { cursor: pointer; }
button:hover { border-color: var(--accent); }

.group { display: flex; flex-direction: column; gap: 10px; }
.group-title { font-size: 0.85rem; color: var(--muted); }
.seg { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.seg button[aria-pressed="true"] { background: var(--accent); color: #04121c; border-color: var(--accent); font-weight: 600; }
.panel label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--text); }

.buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.note { margin: 0; font-size: 0.75rem; line-height: 1.5; color: var(--muted); }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
}