:root {
  --bg: #0a0a0a;
  --fg: #e0e0e0;
  --muted: #888;
  --accent: #00ff88;
  --accent-dim: #00cc6a;
  --warn: #ff6b00;
  --danger: #ff4444;
  --border: #2a2a2a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 13px;
}

.header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #111 0%, #0a0a0a 100%);
}

.brand-title {
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-sub {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.pill {
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.pill-ok {
  border-color: var(--accent-dim);
  color: var(--accent);
  box-shadow: 0 0 12px rgba(0, 255, 136, 0.12);
}

.pill-warn {
  border-color: #553300;
  color: var(--warn);
}

.btn {
  font-family: inherit;
  font-size: 12px;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background 0.15s, box-shadow 0.15s;
}

.btn:hover {
  background: rgba(0, 255, 136, 0.08);
  box-shadow: 0 0 16px rgba(0, 255, 136, 0.2);
}

.btn-primary {
  background: var(--accent);
  color: #0a0a0a;
  font-weight: 600;
}

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

.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}

.stat .label {
  color: var(--muted);
  margin-right: 6px;
}

.grid-shell {
  padding: 12px 18px 24px;
}

.grid-meta {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 8px;
}

.canvas-wrap {
  overflow: auto;
  width: 100%;
  max-width: min(960px, 100%);
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #050505;
  max-height: min(70vh, 720px);
  min-height: 200px;
}

#grid {
  display: block;
  cursor: crosshair;
  touch-action: none;
  max-width: 100%;
  vertical-align: top;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

#grid.read-only {
  cursor: not-allowed;
  opacity: 0.92;
}

.toast-root {
  position: fixed;
  right: 16px;
  bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: min(360px, 90vw);
  pointer-events: none;
  z-index: 50;
}

.toast {
  pointer-events: auto;
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #141414;
  color: var(--fg);
  font-size: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  animation: toast-in 0.2s ease;
}

.toast.err {
  border-color: #662222;
  color: #ffb4b4;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
  }
}