:root {
  --bg: #1c1b29;
  --panel: #262538;
  --panel-light: #2f2e45;
  --accent: #ff5d8f;
  --accent-2: #5de4c7;
  --text: #f4f2ff;
  --muted: #a9a6c4;
  --border: #3a3852;
  --radius: 14px;
  --checker-a: #3a3852;
  --checker-b: #2b2a40;
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at top, #29283f 0%, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 24px 16px 60px;
}

.app {
  width: 100%;
  max-width: 1180px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Header */
.app-header {
  text-align: center;
}
.app-header h1 {
  font-family: 'Press Start 2P', 'Segoe UI', monospace;
  font-size: 1.6rem;
  margin: 0 0 8px;
  letter-spacing: 1px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Toolbar */
.toolbar {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  align-items: flex-end;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
}
.tool-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.tool-group label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.tool-group.actions { margin-left: auto; }

select#gridSize {
  background: var(--panel-light);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.9rem;
  cursor: pointer;
}

.tool-buttons { display: flex; gap: 6px; }
.tool-btn, .action-btn {
  background: var(--panel-light);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: transform 0.1s ease, background 0.15s ease, border-color 0.15s ease;
}
.tool-btn span, .action-btn span {
  font-size: 0.68rem;
  color: var(--muted);
  text-transform: uppercase;
}
.tool-btn:hover, .action-btn:hover { transform: translateY(-1px); border-color: var(--accent-2); }
.tool-btn.active {
  background: linear-gradient(135deg, var(--accent), #ff8fb3);
  border-color: var(--accent);
  color: #1c1b29;
}
.tool-btn.active span { color: #1c1b29; }
.action-btn.active { border-color: var(--accent-2); }
.action-btn.primary { background: linear-gradient(135deg, var(--accent-2), #8ff0da); color: #143028; border-color: var(--accent-2); }
.action-btn.primary span { color: #143028; }
.action-btn.danger:hover { border-color: #ff6767; }

.color-picker-row { display: flex; align-items: center; gap: 10px; }
input[type="color"] {
  width: 46px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: none;
  cursor: pointer;
  padding: 0;
}

/* Palette */
.palette {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.swatch {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: 2px solid rgba(255,255,255,0.15);
  cursor: pointer;
  transition: transform 0.1s ease;
}
.swatch:hover { transform: scale(1.12); }
.swatch.selected { border-color: var(--text); box-shadow: 0 0 0 2px var(--accent); }

/* Workspace */
.workspace {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
}
.panel h2 {
  margin: 0;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.arrow {
  font-size: 1.8rem;
  color: var(--accent-2);
}

.checker-bg {
  background-image: linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
                     linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
                     linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
                     linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: var(--checker-b);
  border-radius: 10px;
  padding: 6px;
}

#editorCanvas {
  cursor: crosshair;
  border-radius: 6px;
  image-rendering: pixelated;
  touch-action: none;
}
#previewCanvas {
  image-rendering: pixelated;
  border-radius: 6px;
}

.hint, .dims {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.app-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  margin-top: 10px;
}

@media (max-width: 720px) {
  .tool-group.actions { margin-left: 0; }
  .app-header h1 { font-size: 1.15rem; }
}