:root {
  --bg: #f7f7f5;
  --panel: #ffffff;
  --text: #1f1f1f;
  --muted: #636363;
  --edge: #c8c8c8;
  --node: #6a6a6a;
  --node-hover: #505050;
  --accent: #3a7afe;
  --start: #2d9c6a;
  --end: #da4b4b;
  --food: #f2b635;
  --worm: #334155;
  --worm-head: #111111;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.page {
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.header h1 {
  margin: 0 0 6px;
  font-size: 1.75rem;
  font-weight: 700;
}

.header p {
  margin: 0 0 18px;
  color: var(--muted);
}

.footer {
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
}

.level-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 14px;
}

.level-controls button {
  border: 1px solid #d8d8d8;
  background: #ffffff;
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer;
}

.level-controls button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.level-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
}

#level-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.board-wrap {
  background: var(--panel);
  border: 1px solid #e8e8e8;
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
}

.bottom-controls {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.bottom-controls button {
  border: 1px solid #d8d8d8;
  background: #ffffff;
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer;
}

#win-next-level {
  border-color: #bad8ff;
  background: #edf4ff;
}

#win-message {
  color: var(--muted);
  font-weight: 600;
}

.board {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  background: #fcfcfc;
}

.edge {
  stroke: var(--edge);
  stroke-width: 3;
  stroke-linecap: round;
}

.node {
  fill: var(--node);
  cursor: pointer;
  transition: fill 120ms ease;
  stroke: #ffffff;
  stroke-width: 2;
}

.node:hover {
  fill: var(--node-hover);
}

.node.is-selected {
  fill: var(--accent);
}

.node-start {
  fill: var(--start);
}

.node-end {
  fill: var(--end);
}

.node-food {
  fill: var(--food);
}

.node-label {
  font-size: 12px;
  fill: #8a8a8a;
  text-anchor: middle;
  pointer-events: none;
}

.worm-edge {
  stroke: var(--worm-head);
  stroke-width: 38;
  stroke-linecap: round;
  opacity: 1;
  pointer-events: none;
}

.worm-node {
  fill: var(--worm-head);
  stroke: none;
  pointer-events: none;
}

.worm-head {
  fill: var(--worm-head);
  stroke: #ffffff;
  stroke-width: 2;
}

.worm-eye {
  fill: #ffffff;
  pointer-events: none;
}

#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1000;
  display: none;
}

#confetti-canvas.active {
  display: block;
}