:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --fg: #e6e8ec;
  --muted: #8a93a6;
  --accent: #9ae6b4;
  --border: #272b35;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

header {
  padding: 20px 32px 10px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
header h1 { margin: 0; font-size: 22px; }
header #subtitle {
  grid-column: 1 / 2;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.lang-switch {
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  gap: 6px;
}

main {
  padding: 20px 32px 32px;
  max-width: 1100px;
  margin: 0 auto;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 20px;
  padding: 14px 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}

button {
  padding: 8px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
}
button:hover { border-color: var(--accent); }
button.primary {
  background: var(--accent);
  color: #0b1320;
  border-color: var(--accent);
  font-weight: 700;
}
button.primary:hover { filter: brightness(1.1); }

.group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.group.stat { min-width: 70px; }

label, .group > span {
  font-size: 10px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

select, input[type="range"] {
  padding: 6px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-size: 13px;
  font-family: inherit;
}
input[type="range"] { width: 120px; padding: 0; }

.stat-value {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 16px;
  color: var(--accent);
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
}

.canvas-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  overflow-x: auto;
}

canvas {
  display: block;
  image-rendering: pixelated;
  cursor: crosshair;
  max-width: 100%;
  height: auto;
}

.hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

footer {
  padding: 20px 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}