:root {
  --bg: #0e0e0e;
  --fg: #f1f1f1;
  --snake: #4caf50;
  --snake-head: #81c784;
  --food: #ffd54f;
  --grid: rgba(255, 255, 255, 0.06);
  --canvas-shadow: rgba(0, 0, 0, 0.35);
}

[data-theme='light'] {
  --bg: #ffffff;
  --fg: #0f0f0f;
  --snake: #2e7d32;
  --snake-head: #66bb6a;
  --food: #ff9800;
  --grid: rgba(0, 0, 0, 0.06);
  --canvas-shadow: rgba(0, 0, 0, 0.15);
}

/* Base / Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  height: 100dvh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: var(--bg);
  color: var(--fg);
  overflow: hidden;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Arial, Helvetica,
    sans-serif;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
}

h1 {
  margin: 10px 0 6px;
}

#hud {
  margin: 8px 0 12px;
}

#hud .sep {
  margin-left: 16px;
}
#hud .hint {
  margin-left: 16px;
  font-size: 12px;
  opacity: 0.8;
}
#hud label {
  margin-left: 16px;
  font-size: 12px;
}
#hud label + label {
  margin-left: 12px;
}

#controls {
  display: flex;
  gap: 8px;
  margin: 4px 0 12px;
}

#controls button {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.08);
  color: var(--fg);
  cursor: pointer;
  transition: background 120ms ease, transform 60ms ease;
}

#controls button:focus-visible {
  outline: 2px solid rgba(100, 150, 255, 0.8);
  outline-offset: 2px;
}

[data-theme='light'] #controls button {
  border-color: rgba(0, 0, 0, 0.15);
  background: rgba(0, 0, 0, 0.06);
}

@media (pointer: coarse) {
  #controls button {
    padding: 10px 16px;
    font-size: 14px;
  }
}

canvas#cobra {
  border-radius: 8px;
  box-shadow: 0 8px 30px var(--canvas-shadow);
  touch-action: none; /* evita pinch/double-tap zoom e pan no canvas */
}

/* D-Pad direcional (aparece apenas em telas de toque) */
#controlesDirecao {
  --dpad-size: 64px;
  display: none; /* mostrado apenas em devices de toque */
  margin: 36px 0 6px;
  gap: 8px;
  grid-template-areas:
    '. up .'
    'left center right'
    '. down .';
  grid-template-columns: var(--dpad-size) var(--dpad-size) var(--dpad-size);
  grid-template-rows: var(--dpad-size) var(--dpad-size) var(--dpad-size);
  place-items: center;
  user-select: none;
  touch-action: manipulation;
}

#controlesDirecao .dir {
  width: var(--dpad-size);
  height: var(--dpad-size);
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.08);
  color: var(--fg);
  font-size: 20px;
  line-height: 1;
  box-shadow: 0 2px 10px var(--canvas-shadow);
}

#controlesDirecao .dir:focus-visible {
  outline: 2px solid rgba(100, 150, 255, 0.8);
  outline-offset: 2px;
}

#controlesDirecao [data-direcao='up'] {
  grid-area: up;
  border-radius: 10px 10px 6px 6px;
}
#controlesDirecao [data-direcao='left'] {
  grid-area: left;
  border-radius: 10px 6px 6px 10px;
}
#controlesDirecao [data-direcao='right'] {
  grid-area: right;
  border-radius: 6px 10px 10px 6px;
}
#controlesDirecao [data-direcao='down'] {
  grid-area: down;
  border-radius: 6px 6px 10px 10px;
}

#controlesDirecao .dir:active {
  transform: translateY(1px);
  filter: brightness(1.1);
}

[data-theme='light'] #controlesDirecao .dir {
  border-color: rgba(0, 0, 0, 0.15);
  background: rgba(0, 0, 0, 0.06);
}

#controlesDirecao .centro {
  grid-area: center;
  width: var(--dpad-size);
  height: var(--dpad-size);
  display: flex;
  align-items: center;
  justify-content: center;
}

#controlesDirecao .centro::after {
  content: '';
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
}

@media (pointer: coarse) {
  body {
    justify-content: flex-start;
    padding-top: calc(env(safe-area-inset-top, 0px) + 6px);
  }
  h1 {
    font-size: 24px;
    margin: 6px 0 4px;
  }
  #hud {
    display: none;
  }
  #controls {
    margin: 4px 0 8px;
  }
  #controlesDirecao {
    display: grid;
    --dpad-size: 68px;
  }
  #controlesDirecao .dir {
    font-size: 22px;
  }
}