:root {
  color-scheme: light;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: #f4f1ea;
  color: #1e1e1e;
  --board-size: min(78vw, 480px);
  --cell-gap: 2px;
  --panel-bg: #fffdf8;
  --panel-border: #d8d2c7;
  --snake: #2f6b3f;
  --snake-head: #194725;
  --enemy: #35648f;
  --enemy-head: #173751;
  --food: #c24b3b;
  --player-food: #5d8f6b;
  --enemy-food: #5d84a6;
  --board-bg: #ece7dc;
  --left-zone-bg: #f4a0ff;
  --right-zone-bg: #e2b678;
  --center-row-line: rgba(95, 91, 85, 0.45);
  --text-muted: #5f5b55;
  --player-lit: #88be97;
  --enemy-lit: #88aacc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--background, #f4f1ea);
}

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

.panel {
  width: min(100%, 620px);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 16px 40px rgba(42, 35, 24, 0.08);
}

.toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: flex-start;
}

.panel__header {
  display: grid;
  justify-items: center;
  text-align: center;
  margin-bottom: 16px;
}

h1,
p {
  margin: 0;
}

.subtitle,
.hint,
.status {
  color: var(--text-muted);
}

.toolbar {
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.join-inline {
  display: grid;
  grid-template-columns: 1fr auto;
  width: 100%;
  align-items: center;
  gap: 8px;
}

.join-inline input {
  width: 98px;
  border: 1px solid #a69f90;
  background: #f9f7f1;
  border-radius: 10px;
  padding: 9px 10px;
  font: inherit;
  color: inherit;
  text-transform: uppercase;
}

.online-status {
  font-size: 0.9rem;
  margin-top: 2px;
}

button {
  border: 1px solid #a69f90;
  background: #f9f7f1;
  color: inherit;
  border-radius: 10px;
  padding: 10px 14px;
  font: inherit;
  cursor: pointer;
}

button:hover {
  background: #f1ecdf;
}

.menu-backdrop {
  display: none;
}

.menu-backdrop[hidden] {
  display: none !important;
}

.hamburger-menu {
  position: fixed;
  top: 14px;
  left: 50%;
  z-index: 40;
  width: min(92vw, 330px);
  max-height: calc(100vh - 28px);
  overflow: auto;
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  background: #fffaf1;
  box-shadow: 0 20px 48px rgba(34, 25, 11, 0.2);
  padding: 12px;
  display: grid;
  gap: 12px;
  transform: translate(-50%, -18px);
  opacity: 0;
  pointer-events: none;
  transition: transform 180ms ease, opacity 160ms ease;
}

.hamburger-menu.is-open {
  transform: translate(-50%, 0);
  opacity: 1;
  pointer-events: auto;
}

.hamburger-menu h2,
.hamburger-menu h3 {
  margin: 0;
}

.hamburger-menu h2 {
  font-size: 1rem;
}

.hamburger-menu h3 {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.menu-section {
  display: grid;
  gap: 8px;
}

.menu-section button {
  width: 100%;
}

.rules-panel {
  margin: 0 0 12px;
  padding: 12px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: #f8f4eb;
  display: grid;
  gap: 8px;
}

.rules-panel h2,
.rules-panel h3 {
  margin: 0;
}

.rules-panel h2 {
  font-size: 1.05rem;
}

.rules-panel h3 {
  font-size: 0.92rem;
}

.rules-panel p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.35;
}

.rules-list {
  margin: 0;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.35;
}

.rules-food-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.rules-food-table th,
.rules-food-table td {
  border: 1px solid var(--panel-border);
  padding: 8px;
  vertical-align: top;
}

.rules-food-table th {
  background: #f1eadc;
  text-align: center;
}

.rules-food-table th small {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.rules-snake {
  display: inline-flex;
  width: 36px;
  height: 12px;
  border-radius: 2px;
  margin-bottom: 4px;
  position: relative;
}

.rules-snake::before,
.rules-snake::after {
  content: "";
  position: absolute;
  top: 0;
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

.rules-snake::before {
  left: 0;
}

.rules-snake::after {
  left: 24px;
}

.rules-snake--green {
  background: var(--snake);
}

.rules-snake--green::before {
  background: var(--snake-head);
}

.rules-snake--green::after {
  background: var(--snake);
}

.rules-snake--blue {
  background: var(--enemy);
}

.rules-snake--blue::before {
  background: var(--enemy-head);
}

.rules-snake--blue::after {
  background: var(--enemy);
}

.rules-food-chip {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 6px;
  vertical-align: middle;
}

.rules-food-chip--point {
  background: var(--food);
}

.rules-food-chip--green {
  background: var(--player-food);
}

.rules-food-chip--blue {
  background: var(--enemy-food);
}

.rules-panel[hidden] {
  display: none !important;
}

.settings-panel {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: rgba(248, 244, 235, 0.96);
  display: grid;
  gap: 10px;
}

.settings-panel h2 {
  margin: 0;
  font-size: 1.05rem;
}

.panel-close-button {
  justify-self: end;
  margin-top: 6px;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.settings-grid label {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.settings-grid input,
.settings-grid select {
  width: 100%;
  border: 1px solid #a69f90;
  background: #f9f7f1;
  border-radius: 10px;
  padding: 8px 10px;
  font: inherit;
  color: inherit;
}

.setting-inline {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
}

.settings-panel[hidden] {
  display: none !important;
}

.game-area {
  width: var(--board-size);
  margin: 0 auto 16px;
  position: relative;
  overflow: visible;
}

.board-tools {
  position: absolute;
  top: 0;
  left: -56px;
  display: grid;
  gap: 8px;
  z-index: 32;
}

.board-tool-button {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 10px;
  font-size: 1rem;
  display: grid;
  place-items: center;
}

.board-tool-button--menu {
  font-size: 1.2rem;
  line-height: 1;
}

.board {
  width: var(--board-size);
  height: var(--board-size);
  position: relative;
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  grid-template-rows: repeat(16, 1fr);
  gap: var(--cell-gap);
  padding: var(--cell-gap);
  background: var(--panel-border);
  border-radius: 12px;
  margin: 0;
  touch-action: none;
  overflow: hidden;
}

.rules-panel--overlay {
  margin: 0;
  position: absolute;
  inset: 0;
  z-index: 20;
  overflow: auto;
  background: rgba(248, 244, 235, 0.96);
  backdrop-filter: blur(1px);
}

.settings-panel--overlay {
  position: absolute;
  inset: 0;
  z-index: 25;
  overflow: auto;
}

.points-bar {
  margin: 0 0 12px;
  padding: 10px 12px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: #f6f2e8;
  display: grid;
  gap: 8px;
}

.points-row {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  align-items: center;
  gap: 10px;
}

.points-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.mini-snake {
  min-height: 14px;
  display: flex;
  gap: 3px;
  align-items: center;
}

.mini-segment {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.mini-segment--player {
  background: var(--snake);
}

.mini-segment--enemy {
  background: var(--enemy);
}

.mini-segment--head.mini-segment--player {
  background: var(--snake-head);
}

.mini-segment--head.mini-segment--enemy {
  background: var(--enemy-head);
}

.mini-segment--lit.mini-segment--player {
  background: var(--player-lit);
}

.mini-segment--lit.mini-segment--enemy {
  background: var(--enemy-lit);
}

.mini-score {
  min-width: 20px;
  text-align: right;
}

.board::before,
.board::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  border-top: 2px solid var(--center-row-line);
  z-index: 10;
  pointer-events: none;
}

.board::before {
  top: var(--center-band-start);
}

.board::after {
  top: var(--center-band-end);
}

.cell {
  position: relative;
  z-index: 1;
  background: var(--board-bg);
  border-radius: 4px;
}

.cell--left-zone {
  background: var(--left-zone-bg);
}

.cell--right-zone {
  background: var(--right-zone-bg);
}

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

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

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

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

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

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

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

.cell--player-flash {
  background: #b9d7bf;
}

.cell--enemy-flash {
  background: #b8cfdf;
}

.controls {
  width: min(100%, 280px);
  margin: 0 auto 12px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.control--up {
  grid-column: 2;
}

.control--left {
  grid-column: 1;
}

.control--down {
  grid-column: 2;
}

.control--right {
  grid-column: 3;
}

.control {
  min-height: 54px;
  border-radius: 14px;
  font-weight: 600;
  touch-action: manipulation;
}

.mobile-actions {
  display: none;
}

.mobile-actions button {
  flex: 1;
}

.hint {
  text-align: center;
  font-size: 0.95rem;
  margin-bottom: 0;
}

@media (max-width: 560px) {
  .panel {
    padding: 16px;
  }

  .toolbar {
    display: block;
  }

  .board-tools {
    left: -48px;
    gap: 6px;
  }

  .board-tool-button {
    width: 38px;
    height: 38px;
    font-size: 0.92rem;
  }

  .hamburger-menu {
    top: 10px;
    bottom: auto;
    left: 50%;
    width: min(96vw, 340px);
    max-height: calc(100vh - 20px);
    border-radius: 12px;
    transform: translate(-50%, -18px);
  }

  .controls {
    width: min(100%, 320px);
    gap: 12px;
    margin: 0 auto 10px;
  }

  .control {
    min-height: 64px;
    font-size: 1rem;
  }

  .mobile-actions {
    display: flex;
    gap: 10px;
    margin: 16px auto 0;
    width: min(100%, 320px);
    padding: 8px;
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    background: #f6f2e8;
  }

  .mobile-actions button {
    min-height: 48px;
    font-weight: 600;
  }
}