:root {
  --bg-top: #d2d6d3;
  --bg-bottom: #8f9892;
  --panel: rgba(244, 247, 241, 0.52);
  --panel-border: rgba(13, 18, 17, 0.14);
  --text-main: #111715;
  --text-soft: rgba(17, 23, 21, 0.68);
  --accent-gold: #ffb545;
  --accent-coral: #f26b4d;
  --accent-aqua: #2f6f65;
  --accent-lime: #84b665;
  --accent-sky: #6d91c7;
  --grid-bg: #bcc4bd;
  --snake-head: #f6a03d;
  --snake-body: #3d7568;
  --food: #ea6545;
  --obstacle: #51636f;
  --obstacle-shadow: rgba(29, 38, 44, 0.2);
  --shadow: 0 30px 70px rgba(20, 27, 24, 0.18);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 12px;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top, rgba(255, 181, 69, 0.18), transparent 24%),
    radial-gradient(circle at 18% 22%, rgba(242, 107, 77, 0.12), transparent 22%),
    radial-gradient(circle at 82% 10%, rgba(47, 111, 101, 0.12), transparent 28%),
    linear-gradient(125deg, rgba(109, 145, 199, 0.1), transparent 54%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  overflow-x: hidden;
  overscroll-behavior: none;
  touch-action: manipulation;
}

button, select, input { font: inherit; }
input[type="range"] { width: 132px; }

.app-shell {
  width: min(100%, 1080px);
  min-height: min(96vh, 860px);
  min-height: min(96dvh, 860px);
  display: grid;
  place-items: center;
  position: relative;
}

.scene-glow {
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(34px);
  opacity: 0.28;
  pointer-events: none;
  animation: float-glow 12s ease-in-out infinite;
}
.scene-glow-left {
  left: -120px;
  top: 50px;
  background: radial-gradient(circle, rgba(255, 181, 69, 0.32), transparent 62%);
}
.scene-glow-right {
  right: -120px;
  bottom: 70px;
  background: radial-gradient(circle, rgba(47, 111, 101, 0.28), transparent 60%);
  animation-delay: -6s;
}

.title-panel,
.game-panel {
  width: min(100%, 960px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px) saturate(1.1);
  position: relative;
  overflow: hidden;
}

.title-panel::before,
.game-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.26), transparent 28%),
    linear-gradient(225deg, rgba(255,255,255,0.12), transparent 40%);
  pointer-events: none;
}

.title-panel {
  padding: 42px 24px;
  text-align: center;
  animation: panel-rise 700ms ease;
}

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  color: var(--accent-aqua);
  font-size: 0.74rem;
  font-weight: 700;
}

h1, h2 {
  margin: 0;
  font-family: "Sora", sans-serif;
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(2.6rem, 7vw, 4.8rem);
  color: var(--text-main);
  text-shadow: 0 10px 28px rgba(255,255,255,0.25);
}

.menu-card {
  width: min(100%, 460px);
  margin: 28px auto 0;
  padding: 20px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.28), rgba(255,255,255,0.12));
  border: 1px solid rgba(255,255,255,0.24);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.22), 0 16px 28px rgba(25,33,29,0.08);
  position: relative;
  z-index: 1;
}

.primary-button,
.secondary-button,
.hud-toggle,
.fact-button,
.history-clear,
.touch-button {
  border: 1px solid rgba(17, 23, 21, 0.08);
  border-radius: 999px;
  cursor: pointer;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 220ms cubic-bezier(0.22, 1, 0.36, 1), background 220ms ease;
}

.primary-button {
  width: 100%;
  padding: 14px 22px;
  background: linear-gradient(135deg, #f7f7f2, #dfe5de);
  color: var(--text-main);
  font-weight: 700;
  box-shadow: 0 12px 24px rgba(25,33,29,0.12);
}
.secondary-button {
  padding: 14px 22px;
  background: rgba(255,255,255,0.18);
  color: var(--text-main);
}
.hud-toggle {
  min-width: 126px;
  padding: 12px 18px;
  background: linear-gradient(135deg, rgba(255,255,255,0.3), rgba(255,255,255,0.14));
  color: var(--text-main);
}
.fact-button,
.history-clear,
.touch-button {
  background: rgba(255,255,255,0.24);
  color: var(--text-main);
}
.fact-button {
  width: 100%;
  padding: 10px 14px;
  margin-top: 10px;
}
.history-clear {
  padding: 8px 12px;
}
.touch-button {
  min-height: 64px;
  font-weight: 700;
  touch-action: manipulation;
}
.primary-button:hover,
.secondary-button:hover,
.hud-toggle:hover,
.fact-button:hover,
.history-clear:hover,
.touch-button:hover,
summary:hover {
  transform: translateY(-2px) scale(1.01);
}

.options-menu {
  margin-top: 18px;
  text-align: left;
  border-radius: 20px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.16);
  overflow: hidden;
}
.audio-menu { margin-top: 12px; }
summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  font-weight: 700;
  color: var(--text-main);
}
summary::-webkit-details-marker { display: none; }
.option-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border-top: 1px solid rgba(17, 23, 21, 0.08);
}
.toggle-row input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent-lime);
}
select {
  min-width: 132px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(17, 23, 21, 0.12);
  background: rgba(255,255,255,0.32);
  color: var(--text-main);
}
.controls-note {
  margin: 14px 0 0;
  color: var(--text-soft);
  font-size: 0.88rem;
}
.mode-description {
  margin: 10px 18px 0;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.16);
  color: var(--text-soft);
  font-size: 0.84rem;
  line-height: 1.45;
  text-align: left;
}
.snake-fact {
  margin: 12px 0 0;
  min-height: 68px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.18);
  color: var(--text-main);
  font-size: 0.86rem;
  line-height: 1.45;
}

.history-panel {
  margin-top: 16px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.16);
  text-align: left;
}
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.history-title { font-size: 1rem; letter-spacing: -0.02em; }
.history-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  color: var(--text-soft);
  font-size: 0.9rem;
}
.history-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-main);
}
.history-empty {
  list-style: none;
  margin-left: -18px;
  color: var(--text-soft);
}

.achievement-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.achievement-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 16px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.16);
}
.achievement-item.locked {
  opacity: 0.58;
}
.achievement-badge {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(255,181,69,0.4), rgba(47,111,101,0.26));
  font-size: 0.78rem;
  font-weight: 700;
}
.achievement-copy strong {
  display: block;
  font-size: 0.92rem;
}
.achievement-copy span {
  display: block;
  color: var(--text-soft);
  font-size: 0.8rem;
  line-height: 1.35;
}

.game-panel {
  padding: 14px;
  animation: panel-rise 480ms ease;
}
body.focus-mode {
  padding: 0;
}
body.focus-mode .app-shell {
  width: 100%;
  min-height: 100dvh;
}
body.focus-mode .scene-glow {
  display: none;
}
body.focus-mode .game-panel {
  width: 100%;
  min-height: 100dvh;
  border-radius: 0;
  border: 0;
  padding: max(10px, env(safe-area-inset-top)) max(10px, env(safe-area-inset-right)) max(10px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
}
.hud {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
  animation: panel-rise 520ms cubic-bezier(0.22, 1, 0.36, 1);
}
.hud-block {
  flex: 1;
  min-width: 140px;
  padding: 10px 12px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.3), rgba(255,255,255,0.14));
  text-align: center;
  border: 1px solid rgba(255,255,255,0.18);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.22);
}
.hud-block.score-pop {
  transform: translateY(-2px) scale(1.02);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.22), 0 10px 24px rgba(246, 160, 61, 0.14);
}
.hud-label {
  display: block;
  margin-bottom: 2px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.hud-block strong { display: block; font-size: 1.2rem; }
.hud-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.hud-meter {
  margin-top: 8px;
  height: 6px;
  border-radius: 999px;
  background: rgba(17,23,21,0.08);
  overflow: hidden;
}
.hud-meter span {
  display: block;
  height: 100%;
  width: 30%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-aqua), var(--accent-gold));
  transition: width 260ms cubic-bezier(0.22, 1, 0.36, 1), opacity 180ms ease;
}

.board-wrap {
  position: relative;
  width: min(100%, min(calc(100dvh - 210px), calc(100vw - 28px), 760px));
  margin: 0 auto;
  transform: translateZ(0);
  touch-action: none;
  overscroll-behavior: none;
}
.board-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 22px;
  pointer-events: none;
  background: radial-gradient(circle at center, transparent 48%, rgba(17,23,21,0.12) 100%);
}
.board-wrap.shake {
  animation: board-shake 260ms ease;
}
#gameCanvas {
  width: 100%;
  max-width: 100%;
  aspect-ratio: 1;
  display: block;
  border-radius: 22px;
  background: radial-gradient(circle at top, rgba(255,255,255,0.14), transparent 34%), var(--grid-bg);
  border: 1px solid rgba(255,255,255,0.22);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.18), 0 28px 50px rgba(0,0,0,0.12);
  filter: saturate(0.95) contrast(1.02);
  touch-action: none;
}
#gameCanvas.flash { animation: board-flash 180ms ease; }
.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 14px;
  padding: 24px;
  text-align: center;
  border-radius: 22px;
  background: rgba(235,240,235,0.66);
  backdrop-filter: blur(18px);
  animation: panel-rise 220ms cubic-bezier(0.22, 1, 0.36, 1);
}
.overlay p { margin: 0; color: var(--text-soft); }
.overlay-actions { display: flex; gap: 12px; justify-content: center; }
.noise-overlay {
  position: absolute;
  inset: 0;
  border-radius: 22px;
  pointer-events: none;
  opacity: 0.12;
  mix-blend-mode: soft-light;
  background:
    repeating-linear-gradient(180deg, rgba(17,23,21,0.08) 0 1px, transparent 1px 3px),
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.28), transparent 24%),
    radial-gradient(circle at 80% 70%, rgba(17,23,21,0.12), transparent 22%);
}
.hidden { display: none; }

.touch-controls {
  display: none;
  touch-action: manipulation;
  grid-template-columns: repeat(3, minmax(72px, 88px));
  grid-template-areas: ". up ." "left pause right" ". down .";
  gap: 10px;
  justify-content: center;
  margin: 14px auto 0;
}
.touch-up { grid-area: up; }
.touch-left { grid-area: left; }
.touch-right { grid-area: right; }
.touch-down { grid-area: down; }
.touch-pause { grid-area: pause; font-size: 0.92rem; }

@keyframes panel-rise {
  from { opacity: 0; transform: translateY(18px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes board-flash {
  0% { filter: brightness(1.3); }
  100% { filter: brightness(1); }
}
@keyframes float-glow {
  0%,100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-18px) scale(1.06); }
}
@keyframes board-shake {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(4px); }
}

@media (hover: none) and (pointer: coarse) {
  .touch-controls { display: grid; }
}

@media (orientation: landscape) and (hover: none) and (pointer: coarse) {
  .game-panel { padding-bottom: 18px; }
  .touch-controls {
    grid-template-columns: repeat(5, minmax(78px, 96px));
    grid-template-areas: "left up pause down right";
  }
}

@media (max-width: 720px) {
  body { padding: 8px; }
  .app-shell { width: 100%; min-height: 100dvh; }
  .title-panel, .game-panel { border-radius: 24px; }
  .title-panel { padding: 32px 16px; }
  .menu-card { width: 100%; padding: 16px; }
  .hud { flex-direction: column; }
  .hud-actions { width: 100%; }
  .hud-toggle { flex: 1; justify-content: center; }
  .game-panel { padding: 10px; }
  .board-wrap { width: min(100%, min(calc(100dvh - 250px), calc(100vw - 16px), 620px)); }
  .touch-controls { gap: 8px; grid-template-columns: repeat(3, minmax(64px, 84px)); }
  .overlay-actions { flex-direction: column; }
  .history-list li { flex-direction: column; gap: 2px; }
}