:root {
  color-scheme: dark;
  --bg: #080b10;
  --panel: #111720;
  --panel-2: #171e28;
  --line: #2f3b49;
  --text: #eef3f8;
  --muted: #9daaba;
  --accent: #7fa8ff;
  --danger: #c24b5a;
  --good: #6fcf83;
  --tap: 48px;
  --gap: 8px;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(61, 76, 101, 0.22), transparent 36rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
}

body {
  padding: calc(16px + var(--safe-t)) calc(16px + var(--safe-r))
    calc(16px + var(--safe-b)) calc(16px + var(--safe-l));
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.game-shell {
  width: min(1180px, 100%);
  margin: 0 auto;
  outline: none;
}

.game-shell:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 6px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 12px;
}

h1 {
  margin: 0 0 5px;
  font-size: clamp(1.05rem, 4vw, 2.1rem);
  line-height: 1.15;
}

.topbar p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.78rem, 2.6vw, 1rem);
}

.controls-help {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.controls-help span {
  border: 1px solid var(--line);
  background: rgba(17, 23, 32, 0.72);
  border-radius: 8px;
  padding: 5px 8px;
  font-size: 0.72rem;
  white-space: nowrap;
}

/* Touch vs pointer capability swapping ----------------------------------- */
.touch-only {
  display: none;
}

@media (hover: none) and (pointer: coarse) {
  .desktop-only {
    display: none;
  }

  .touch-only {
    display: flex;
  }
}

.game-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #090c11;
  display: flex;
  justify-content: center;
  /* Never stretch the board: it must keep the aspect the canvas was sized to. */
  align-items: center;
}

canvas {
  display: block;
  max-width: 100%;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  padding: 16px;
}

.overlay.hidden {
  display: none;
}

.overlay-card {
  max-width: 420px;
  text-align: center;
  padding: 16px 20px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: rgba(10, 14, 20, 0.92);
  backdrop-filter: blur(8px);
}

.overlay-card h2 {
  margin: 0 0 7px;
  letter-spacing: 0.04em;
  font-size: clamp(1rem, 4.4vw, 1.5rem);
}

.overlay-card p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.8rem, 3vw, 1rem);
}

/* Control deck: d-pad + action cluster ------------------------------------ */
.control-deck {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 12px;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, var(--tap));
  grid-template-rows: repeat(3, var(--tap));
  gap: 6px;
  flex: 0 0 auto;
}

.pad {
  min-height: 0;
  padding: 0;
  font-size: 1.05rem;
  line-height: 1;
  border-radius: 12px;
  background: var(--panel-2);
  touch-action: none;
}

.pad.up {
  grid-area: 1 / 2;
}

.pad.left {
  grid-area: 2 / 1;
}

.pad-hub {
  grid-area: 2 / 2;
  border-radius: 12px;
  border: 1px dashed var(--line);
  opacity: 0.5;
}

.pad.right {
  grid-area: 2 / 3;
}

.pad.down {
  grid-area: 3 / 2;
}

.action-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap);
  justify-content: flex-end;
  flex: 1 1 auto;
}

.action {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: var(--tap);
  min-width: 88px;
  flex: 0 1 118px;
  touch-action: none;
}

.action small {
  color: var(--muted);
  font-size: 0.68rem;
}

.action.fire {
  background: #5c2530;
  border-color: #8d3d4b;
  flex-basis: 132px;
}

.action.fire:hover {
  background: #6d2c39;
}

.utility-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap);
  margin-top: var(--gap);
}

.utility-row button {
  flex: 1 1 150px;
}

button {
  min-height: var(--tap);
  border-radius: 9px;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--panel-2);
  cursor: pointer;
  padding: 8px 12px;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

@media (hover: hover) {
  button:hover {
    border-color: #55687d;
    background: #202a36;
  }
}

button:active,
button.held {
  transform: translateY(1px);
  border-color: var(--accent);
  background: #26364a;
}

button.primary {
  background: #27496e;
  border-color: #416b96;
}

.status {
  color: var(--muted);
  margin: 12px 2px 0;
  font-size: clamp(0.78rem, 2.7vw, 0.95rem);
}

/* Tablets and small laptops ---------------------------------------------- */
@media (max-width: 860px) {
  body {
    padding: calc(10px + var(--safe-t)) calc(10px + var(--safe-r))
      calc(10px + var(--safe-b)) calc(10px + var(--safe-l));
  }

  .topbar {
    flex-direction: column;
    gap: 8px;
    margin-bottom: 10px;
  }

  .controls-help {
    justify-content: flex-start;
  }
}

/* Phones ------------------------------------------------------------------ */
@media (max-width: 560px) {
  :root {
    --tap: 48px;
    --gap: 6px;
  }

  .topbar p {
    display: none;
  }

  .action {
    min-width: 70px;
    flex: 1 1 70px;
  }

  .action.fire {
    flex-basis: 100%;
    order: -1;
  }

  .utility-row button {
    flex: 1 1 0;
    min-width: 0;
    padding: 8px 4px;
    font-size: 0.76rem;
  }
}

/* Short portrait screens: every pixel of height goes to the maze. */
@media (orientation: portrait) and (max-height: 700px) {
  :root {
    --tap: 44px;
  }

  .status {
    display: none;
  }

  .control-deck {
    margin-top: 8px;
  }
}

/* Sub-270px viewports: stack the pad and the action buttons ---------------- */
@media (max-width: 270px) {
  :root {
    --tap: 42px;
    --gap: 5px;
  }

  .control-deck {
    flex-wrap: wrap;
    justify-content: center;
  }

  .action-cluster {
    flex: 1 1 100%;
    justify-content: center;
  }

  .utility-row button {
    font-size: 0.7rem;
  }
}

/* Landscape phones: pad | maze | actions, so the board keeps full height --- */
@media (orientation: landscape) and (max-height: 620px) {
  :root {
    --tap: 44px;
    --gap: 6px;
  }

  .game-shell {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-rows: auto auto;
    grid-template-areas:
      "util  util   util"
      "pad   panel  act";
    gap: 6px 8px;
    align-items: center;
  }

  .topbar,
  .status {
    display: none;
  }

  /* The deck's children become grid items on either side of the maze. */
  .control-deck {
    display: contents;
  }

  .dpad {
    grid-area: pad;
  }

  .game-panel {
    grid-area: panel;
  }

  .action-cluster {
    grid-area: act;
    flex-direction: column;
    flex: 0 0 auto;
    width: 108px;
  }

  .action {
    width: 100%;
    flex: 0 0 auto;
    min-height: 42px;
  }

  .action.fire {
    order: -1;
    flex-basis: auto;
  }

  .utility-row {
    grid-area: util;
    margin: 0;
  }

  .utility-row button {
    min-height: 38px;
    padding: 6px 8px;
    font-size: 0.76rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  button:active,
  button.held {
    transform: none;
  }
}