:root {
  color-scheme: light;
  --bg: #efe8d8;
  --panel: #fffdf8;
  --border: #2d2a26;
  --muted: #746a5b;
  --snake: #2f6b3b;
  --snake-head: #15391b;
  --food: #bb3e2b;
  --cell: #ece4cf;
  --surface: #f6efdd;
  --surface-strong: #eadcb8;
  --shadow: rgba(45, 42, 38, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, #f9f3e4 0, #f9f3e4 18%, transparent 19%),
    linear-gradient(180deg, #f5efdf 0%, var(--bg) 100%);
  color: var(--border);
  overflow: hidden;
}

button,
input {
  font: inherit;
}

button {
  border: 2px solid var(--border);
  background: #f6ecd1;
  color: var(--border);
  cursor: pointer;
}

input {
  width: 100%;
  border: 2px solid var(--border);
  background: #fffdfa;
  color: var(--border);
  padding: 10px 12px;
}

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

.panel {
  width: min(1180px, 100%);
  height: min(820px, calc(100vh - 32px));
  background: var(--panel);
  border: 2px solid var(--border);
  padding: 18px;
  box-shadow: 10px 10px 0 var(--shadow);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 16px;
  overflow: hidden;
}

.heading,
.actions,
.controls-row,
.leaderboard-item {
  display: flex;
  align-items: center;
}

.heading,
.actions,
.leaderboard-item {
  justify-content: space-between;
  gap: 16px;
}

.actions {
  flex-wrap: wrap;
}

.hidden {
  display: none !important;
}

.eyebrow {
  margin: 0 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--muted);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1;
}

h2 {
  font-size: 1rem;
}

.intro,
.leaderboard-note,
.status,
.scoreboard span,
.meta-card span,
.field span,
.leaderboard-rank {
  color: var(--muted);
}

.scoreboard,
.meta-card,
.leaderboard-item,
.field input,
.sidebar-card,
.start-screen {
  background: var(--surface);
}

.title-block {
  display: grid;
  gap: 4px;
}

.subhead,
.sidebar-copy {
  max-width: 48ch;
  font-size: 0.95rem;
  color: var(--muted);
}

.scoreboard {
  min-width: 104px;
  padding: 10px 16px;
  border: 2px solid var(--border);
  text-align: center;
  align-self: start;
}

.scoreboard strong,
.meta-card strong {
  display: block;
  color: var(--border);
}

.scoreboard strong {
  font-size: 1.55rem;
}

.content-grid {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 16px;
}

.main-stage,
.sidebar,
.game-shell {
  min-height: 0;
}

.main-stage {
  display: grid;
  min-height: 0;
}

.start-screen,
.game-shell,
.sidebar-card {
  border: 2px solid var(--border);
  padding: 16px;
  min-height: 0;
}

.start-screen {
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 14px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.32), rgba(255, 255, 255, 0)),
    var(--surface);
}

.player-form {
  display: grid;
  gap: 10px;
  width: min(100%, 360px);
}

.field {
  display: grid;
  gap: 6px;
}

.player-form button,
.actions button {
  padding: 10px 14px;
}

.start-tips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.start-tips span,
.sidebar-label {
  border: 1px solid rgba(45, 42, 38, 0.18);
  background: rgba(255, 255, 255, 0.55);
  padding: 6px 10px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.meta-card {
  border: 2px solid var(--border);
  padding: 10px 12px;
}

.meta-card strong {
  font-size: 1.1rem;
}

.game-shell {
  display: grid;
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
  gap: 12px;
  align-content: start;
}

.status {
  min-height: 20px;
  font-size: 0.95rem;
}

.board {
  display: grid;
  grid-template-columns: repeat(16, minmax(0, 1fr));
  gap: 2px;
  width: min(100%, min(48vh, 430px));
  margin: 0 auto;
  padding: 8px;
  background: var(--border);
  border: 2px solid var(--border);
  aspect-ratio: 1;
  touch-action: none;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

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

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

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

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

.controls {
  display: grid;
  justify-content: center;
  gap: 8px;
}

.controls button {
  width: 56px;
  height: 56px;
  font-size: 1.25rem;
}

.controls-row {
  gap: 8px;
  justify-content: center;
}

.sidebar {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
}

.sidebar-card {
  display: grid;
  gap: 10px;
}

.leaderboard-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}

.leaderboard-header {
  display: grid;
  gap: 4px;
  margin-bottom: 10px;
}

.leaderboard-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
  max-height: 100%;
  overflow: auto;
  padding-right: 4px;
}

.leaderboard-item {
  border: 2px solid var(--border);
  padding: 10px 12px;
}

.leaderboard-item.current-player {
  background: var(--surface-strong);
}

.leaderboard-name {
  font-weight: 700;
}

.leaderboard-meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.leaderboard-score {
  font-size: 1.1rem;
  font-weight: 700;
}

.empty-state {
  border: 2px dashed var(--border);
  padding: 16px;
  background: var(--surface);
  color: var(--muted);
}

@media (min-width: 801px) {
  .controls {
    display: none;
  }
}

@media (max-width: 1000px) {
  body {
    overflow: auto;
  }

  .app {
    height: auto;
    min-height: 100vh;
  }

  .panel {
    height: auto;
    min-height: unset;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    grid-template-rows: auto auto;
  }

  .leaderboard-list {
    max-height: 240px;
  }
}

@media (max-width: 800px) {
  body {
    overflow: auto;
  }

  .board {
    width: min(100%, 560px);
  }
}

@media (max-width: 640px) {
  .panel {
    padding: 16px;
  }

  .heading,
  .actions {
    flex-direction: column;
    align-items: stretch;
  }

  .scoreboard {
    align-self: flex-start;
  }

  .meta-grid {
    grid-template-columns: 1fr;
  }

  .game-shell {
    grid-template-rows: auto auto auto auto auto;
  }
}

@media (max-width: 480px) {
  .app {
    padding: 10px;
  }

  .panel,
  .start-screen,
  .game-shell,
  .sidebar-card {
    padding: 12px;
  }
}