:root {
  --bg-0: #f3efe6;
  --bg-1: #f9f8f4;
  --bg-2: #edf5ef;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-border: rgba(32, 46, 67, 0.14);
  --text-0: #1f2b3b;
  --text-1: #556273;
  --accent: #1e7a58;
  --accent-strong: #14573f;
  --focus-ring: #206bce;
  --food: #d74f2a;
  --snake-head: #1e7a58;
  --snake-body: #57b48d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Gill Sans", "Avenir Next", "PingFang SC", "Hiragino Sans GB",
    sans-serif;
  color: var(--text-0);
  background:
    radial-gradient(circle at 10% 20%, #fff9ed 0%, rgba(255, 249, 237, 0) 55%),
    radial-gradient(circle at 85% 80%, #e7f5ee 0%, rgba(231, 245, 238, 0) 48%),
    linear-gradient(160deg, var(--bg-0), var(--bg-1), var(--bg-2));
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}

.panel {
  width: min(92vw, 560px);
  padding: 18px;
  border-radius: 20px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(8px);
  box-shadow:
    0 14px 34px rgba(31, 43, 59, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
  animation: panel-in 420ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.panel__top {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 12px;
  margin-bottom: 14px;
}

.label {
  margin: 0;
  color: var(--text-1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 12px;
}

.score {
  margin: 2px 0 0;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
}

.status {
  margin: 0;
  color: var(--text-1);
  font-size: 14px;
  font-weight: 500;
}

.board {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 16px;
  border: 1px solid rgba(31, 43, 59, 0.18);
  background:
    linear-gradient(to right, rgba(31, 43, 59, 0.08) 1px, transparent 1px) 0 0 / 24px
      24px,
    linear-gradient(to bottom, rgba(31, 43, 59, 0.08) 1px, transparent 1px) 0 0 /
      24px 24px,
    #f2f7f4;
}

.panel__actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 12px;
  min-height: 44px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
  filter: brightness(0.98);
}

.btn:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus-ring) 55%, #ffffff);
  outline-offset: 2px;
}

.btn--primary {
  color: #ffffff;
  background: linear-gradient(160deg, var(--accent), var(--accent-strong));
  box-shadow: 0 8px 16px rgba(20, 87, 63, 0.28);
}

.btn--ghost {
  color: var(--text-0);
  background: #ffffff;
  border: 1px solid rgba(31, 43, 59, 0.2);
}

@media (prefers-reduced-motion: reduce) {
  .panel,
  .btn {
    animation: none;
    transition: none;
  }
}

@media (max-width: 520px) {
  .panel {
    padding: 14px;
  }

  .panel__actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}