:root {
  --bg-start: #000000;
  --bg-end: #050505;
  --panel: rgba(10, 10, 10, 0.88);
  --panel-border: rgba(255, 255, 255, 0.16);
  --text: #f4f4f5;
  --muted: #b0b0bb;
  --snake: #22c55e;
  --snake-head: #16a34a;
  --food: #ef4444;
  --accent: #8be8ff;
}

:root[data-theme="light"] {
  --bg-start: #fffaf0;
  --bg-end: #f5ecd9;
  --panel: rgba(255, 248, 232, 0.92);
  --panel-border: rgba(107, 88, 48, 0.24);
  --text: #2f2416;
  --muted: #6b5f4e;
  --accent: #8a6a2f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, var(--bg-end), var(--bg-start));
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.panel {
  width: min(96vw, 560px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 1rem;
  backdrop-filter: blur(6px);
}

.hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.hud h1 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: 0.04em;
}

.hud-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hud-right p {
  margin: 0;
}

button {
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: rgba(20, 20, 20, 0.92);
  color: var(--text);
  border-radius: 10px;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
}

:root[data-theme="light"] button {
  background: rgba(255, 250, 240, 0.98);
  border-color: rgba(107, 88, 48, 0.35);
}

.icon-button {
  width: 2.2rem;
  height: 2.2rem;
  padding: 0;
  display: inline-grid;
  place-items: center;
  font-size: 1.05rem;
  line-height: 1;
}

button:hover {
  border-color: var(--accent);
}

.status {
  margin: 0.75rem 0;
  color: var(--muted);
  min-height: 1.25rem;
}

.board {
  display: grid;
  width: 100%;
  aspect-ratio: 1;
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 8px;
  background: transparent;
  position: relative;
  overflow: hidden;
}

.board-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.controls {
  margin-top: 0.75rem;
  display: none;
  justify-items: center;
  gap: 0.4rem;
}

.controls-row {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 0.4rem;
}

.help {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.75rem 0 0;
}

@media (max-width: 800px) {
  .controls {
    display: grid;
    margin-top: 1rem;
    gap: 0.6rem;
  }

  .controls button {
    min-width: 3rem;
    min-height: 3rem;
    font-size: 1.2rem;
    border-radius: 12px;
  }

  .controls-row {
    gap: 0.55rem;
  }

  .icon-button {
    width: 2.7rem;
    height: 2.7rem;
    font-size: 1.2rem;
  }
}