:root {
  --bg-1: #090e29;
  --bg-2: #1a1145;
  --panel: rgba(8, 12, 34, 0.7);
  --text: #e6ecff;
  --accent: #5df2ff;
  --accent-2: #ff5de1;
  --snake-head: #9aff2e;
  --snake-body: #40f9a2;
  --food: #ff6b9b;
  --grid: rgba(93, 242, 255, 0.08);
  --canvas-bg: rgba(2, 6, 24, 0.95);
  --snake-head-glow: rgba(154, 255, 46, 0.95);
  --snake-body-glow: rgba(64, 249, 162, 0.85);
  --food-glow: rgba(255, 107, 155, 0.95);
  --button-grad-1: rgba(93, 242, 255, 0.15);
  --button-grad-2: rgba(255, 93, 225, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: clamp(0.5rem, 2vw, 1rem);
  font-family: "Orbitron", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 20%, #2843a4 0%, transparent 38%),
    radial-gradient(circle at 85% 78%, #8c267f 0%, transparent 42%),
    linear-gradient(135deg, var(--bg-1), var(--bg-2));
}

.app {
  width: min(100%, 860px);
  padding: clamp(0.75rem, 2vw, 1.15rem);
  border: 1px solid rgba(93, 242, 255, 0.25);
  border-radius: 16px;
  background: var(--panel);
  box-shadow:
    0 0 22px rgba(93, 242, 255, 0.3),
    0 0 80px rgba(255, 93, 225, 0.17);
}

.hud {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 0.9rem;
}

.hud h1 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
  letter-spacing: 0.06em;
  text-shadow: 0 0 9px rgba(93, 242, 255, 0.9);
}

.hud-right {
  display: grid;
  gap: 0.3rem;
  justify-items: end;
}

#score,
#highScore,
#status,
#effectStatus {
  margin: 0;
  font-size: 0.95rem;
}

#status {
  color: var(--accent);
}

#effectStatus {
  color: var(--accent-2);
  font-size: 0.82rem;
}

#startBtn {
  border: 1px solid rgba(93, 242, 255, 0.6);
  background: linear-gradient(120deg, var(--button-grad-1), var(--button-grad-2));
  color: var(--text);
  padding: 0.6rem 1rem;
  border-radius: 10px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

#startBtn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 12px rgba(93, 242, 255, 0.55);
}

.board-wrap {
  position: relative;
  width: min(600px, 100%);
  max-width: 100%;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

#gameCanvas {
  width: 100%;
  height: 100%;
  display: block;
  background: var(--canvas-bg);
  border-radius: 12px;
  border: 1px solid rgba(93, 242, 255, 0.25);
  box-shadow: inset 0 0 25px rgba(93, 242, 255, 0.12);
}

.overlay {
  position: absolute;
  inset: 0;
  border-radius: 12px;
  display: grid;
  place-content: center;
  text-align: center;
  padding: 1rem;
  background: rgba(4, 9, 29, 0.76);
  backdrop-filter: blur(3px);
}

.overlay h2 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  color: var(--accent-2);
  text-shadow: 0 0 12px rgba(255, 93, 225, 0.7);
}

.overlay p {
  margin: 0;
}

.hidden {
  display: none;
}

.touch-controls {
  margin-top: 0.85rem;
  display: none;
  grid-template-columns: repeat(3, minmax(56px, 72px));
  grid-template-areas:
    ". up ."
    "left pause right"
    ". down .";
  justify-content: center;
  gap: 0.55rem;
}

.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;
}

.touch-btn {
  border: 1px solid rgba(93, 242, 255, 0.55);
  background: linear-gradient(120deg, var(--button-grad-1), var(--button-grad-2));
  color: var(--text);
  border-radius: 10px;
  min-height: 2.9rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  touch-action: manipulation;
}

.touch-btn:active {
  transform: scale(0.97);
}

.touch-btn:disabled {
  opacity: 0.45;
}

.help {
  margin-top: 0.8rem;
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
  opacity: 0.88;
  font-size: 0.82rem;
}

.help p {
  margin: 0;
}

.settings {
  margin-top: 0.9rem;
  padding: 0.85rem;
  border: 1px solid rgba(93, 242, 255, 0.25);
  border-radius: 12px;
  background: rgba(4, 10, 34, 0.45);
}

.settings h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.03em;
}

.settings-note {
  margin: 0.3rem 0 0.7rem;
  font-size: 0.78rem;
  opacity: 0.85;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 0.7rem;
}

.settings label {
  display: grid;
  gap: 0.25rem;
  font-size: 0.84rem;
}

.settings select {
  border: 1px solid rgba(93, 242, 255, 0.45);
  border-radius: 8px;
  background: rgba(8, 12, 34, 0.8);
  color: var(--text);
  padding: 0.45rem 0.55rem;
  font-family: inherit;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 2rem;
}

#soundToggle {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

#soundLabel {
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--accent);
}

@media (max-width: 700px) {
  body {
    place-items: start center;
  }

  .app {
    border-radius: 12px;
  }

  .hud {
    flex-direction: column;
    align-items: flex-start;
  }

  .hud-right {
    justify-items: start;
    width: 100%;
  }

  #startBtn {
    width: 100%;
  }

  .help {
    flex-direction: column;
  }

  .settings-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  body {
    padding: 0.5rem;
  }

  .app {
    width: 100%;
    padding: 0.7rem;
  }

  .hud h1 {
    font-size: clamp(1.2rem, 6vw, 1.6rem);
  }

  #score,
  #highScore,
  #status,
  #effectStatus {
    font-size: 0.82rem;
  }

  .settings {
    padding: 0.65rem;
  }

  .settings h2 {
    font-size: 0.92rem;
  }

  .settings-note,
  .help {
    font-size: 0.74rem;
  }

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

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

  .board-wrap,
  #gameCanvas {
    touch-action: none;
  }
}

@media (max-width: 900px) and (min-width: 701px) {
  .settings-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-height: 760px) and (orientation: landscape) {
  body {
    place-items: start center;
    padding-block: 0.4rem;
  }

  .app {
    width: min(100%, 960px);
    display: grid;
    grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
    column-gap: 0.8rem;
    row-gap: 0.6rem;
    align-items: start;
  }

  .hud {
    grid-column: 1;
    grid-row: 1;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 0;
  }

  .hud-right {
    justify-items: start;
    width: 100%;
  }

  #startBtn {
    width: 100%;
  }

  .board-wrap {
    grid-column: 2;
    grid-row: 1 / span 3;
    width: min(72vh, 520px);
    justify-self: center;
    margin: 0;
  }

  .touch-controls {
    margin-top: 0.6rem;
  }

  .settings {
    grid-column: 1;
    grid-row: 2;
    margin-top: 0;
  }

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

  .help {
    grid-column: 1;
    grid-row: 3;
    margin-top: 0;
    flex-direction: column;
    gap: 0.35rem;
  }
}