:root {
  --bg-top: #ebf7ef;
  --bg-mid: #d9eddc;
  --bg-bottom: #bed8c2;
  --panel-bg: rgba(247, 255, 249, 0.86);
  --panel-border: rgba(255, 255, 255, 0.7);
  --board-bg: #c1d8c6;
  --cell-bg: rgba(239, 248, 241, 0.9);
  --snake: #1f7a40;
  --snake-head: #14552c;
  --food: #d54a4a;
  --text: #1f3427;
  --muted: #4f6656;
  --btn-bg: #2f8658;
  --btn-bg-hover: #256c46;
  --btn-shadow: 0 12px 24px rgba(32, 92, 57, 0.26);
  --shadow: 0 24px 56px rgba(31, 54, 39, 0.16);
  --board-size: min(70vh, 58vw, 760px);
  --panel-width: min(34vw, 420px);
  --gap: clamp(3px, 0.55vw, 6px);
  --grid-size: 16;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  overflow: hidden;
  font-family: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 16% 12%, rgba(255, 255, 255, 0.62), transparent 38%),
    radial-gradient(circle at 90% 8%, rgba(255, 255, 255, 0.45), transparent 42%),
    linear-gradient(160deg, var(--bg-top), var(--bg-mid) 46%, var(--bg-bottom));
}

.page {
  height: 100vh;
  display: grid;
  grid-template-columns: minmax(280px, var(--panel-width)) minmax(320px, var(--board-size));
  align-items: center;
  justify-content: center;
  gap: clamp(18px, 2.4vw, 34px);
  padding: clamp(12px, 2.2vw, 24px);
}

.panel {
  width: 100%;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 22px;
  padding: clamp(16px, 2.1vw, 24px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.heading h1 {
  margin: 0 0 8px;
  font-size: clamp(2.15rem, 4.4vw, 3.9rem);
  line-height: 0.96;
  letter-spacing: 0.02em;
}

.heading p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.28vw, 1.16rem);
}

.scores {
  margin-top: clamp(12px, 1.7vw, 18px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(10px, 1.2vw, 14px);
}

.score-card {
  background: rgba(233, 245, 236, 0.9);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.58);
  padding: clamp(10px, 1.4vw, 13px) 12px;
  text-align: center;
}

.score-card .label {
  display: block;
  font-size: clamp(0.72rem, 0.9vw, 0.84rem);
  text-transform: uppercase;
  color: #5d7963;
  letter-spacing: 0.06em;
}

.score-card strong {
  display: block;
  margin-top: 3px;
  font-size: clamp(1.35rem, 2vw, 2rem);
  line-height: 1;
}

.actions {
  margin-top: clamp(12px, 1.6vw, 16px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.primary-btn {
  border: 0;
  border-radius: 12px;
  background: var(--btn-bg);
  color: #fff;
  font-weight: 700;
  font-size: clamp(0.94rem, 1.1vw, 1.06rem);
  padding: clamp(9px, 1.2vw, 12px) 12px;
  cursor: pointer;
  box-shadow: var(--btn-shadow);
  transition:
    transform 0.15s ease,
    background-color 0.2s ease,
    box-shadow 0.2s ease;
}

.primary-btn:hover {
  background: var(--btn-bg-hover);
  box-shadow: 0 15px 28px rgba(25, 82, 49, 0.34);
}

.primary-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.board-wrap {
  width: min(100%, var(--board-size));
  position: relative;
}

.board {
  width: 100%;
  aspect-ratio: 1;
  padding: var(--gap);
  border-radius: 20px;
  background: var(--board-bg);
  display: grid;
  grid-template-columns: repeat(var(--grid-size), 1fr);
  gap: var(--gap);
  box-shadow: var(--shadow);
}

.cell {
  border-radius: 4px;
  background: var(--cell-bg);
}

.cell.snake {
  background: var(--snake);
}

.cell.head {
  background: var(--snake-head);
}

.cell.food {
  background: var(--food);
}

.overlay {
  position: absolute;
  inset: 0;
  border-radius: 20px;
  background: rgba(16, 29, 22, 0.6);
  display: grid;
  place-content: center;
  text-align: center;
  color: #fff;
  gap: 10px;
  backdrop-filter: blur(2px);
}

.overlay h2 {
  margin: 0;
  font-size: clamp(1.25rem, 1.9vw, 1.95rem);
}

.hidden {
  display: none;
}

.mobile-controls {
  margin-top: 12px;
  display: none;
  gap: 8px;
  justify-items: center;
}

.control-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(64px, 84px));
  gap: 8px;
}

.control-btn {
  border: 0;
  border-radius: 10px;
  background: #f5fbf6;
  color: var(--text);
  padding: 9px 12px;
  font-weight: 700;
  min-width: 72px;
}

@media (max-width: 980px) {
  :root {
    --board-size: min(50vh, 92vw, 510px);
  }

  body {
    overflow: auto;
  }

  .page {
    min-height: 100vh;
    height: auto;
    grid-template-columns: 1fr;
    justify-items: center;
    align-content: center;
    gap: 14px;
    padding: 14px;
  }

  .panel,
  .board-wrap {
    width: min(92vw, 560px);
  }

  .mobile-controls {
    display: grid;
  }
}

@media (max-width: 560px) {
  .scores,
  .actions {
    grid-template-columns: 1fr;
  }

  .control-row {
    grid-template-columns: repeat(3, minmax(58px, 76px));
    gap: 6px;
  }

  .control-btn {
    min-width: 62px;
    padding: 8px 10px;
  }
}