:root {
  color-scheme: dark;
  --bg: #111519;
  --panel: #1c2327;
  --panel-strong: #263038;
  --ink: #edf3ef;
  --muted: #9fb0aa;
  --line: #3b474c;
  --brass: #d59d4b;
  --cool: #45d4d0;
  --danger: #ef5d43;
  --good: #7ddf72;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background:
    linear-gradient(135deg, rgba(69, 212, 208, 0.08), transparent 32rem),
    radial-gradient(circle at 80% 20%, rgba(213, 157, 75, 0.1), transparent 22rem),
    var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
  border: 1px solid #597078;
  border-radius: 8px;
  background: #273238;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 750;
}

button:focus-visible {
  outline: 3px solid var(--cool);
  outline-offset: 2px;
}

.app-shell {
  width: min(1180px, calc(100vw - 24px));
  margin: 0 auto;
  padding: 18px 0 24px;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 14px;
}

.top-bar h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.25rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.top-bar p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

#restartButton {
  min-width: 118px;
  min-height: 46px;
  padding: 0 18px;
  background: linear-gradient(#354148, #20292e);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.22);
}

#restartButton:hover {
  border-color: var(--cool);
}

.play-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 318px;
  gap: 16px;
  align-items: start;
}

.stage {
  position: relative;
  border: 1px solid #53636b;
  border-radius: 8px;
  overflow: hidden;
  background: #080b0d;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.34);
}

#gameCanvas {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #11171a;
  image-rendering: pixelated;
  touch-action: none;
}

.side-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(28, 35, 39, 0.92);
  padding: 16px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
}

.objective-panel h2 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  letter-spacing: 0;
}

.objective-panel p,
.controls-line {
  margin: 0;
  color: #dce7e3;
  font-size: 0.98rem;
  line-height: 1.45;
}

.objective-panel .mechanic {
  margin-top: 12px;
  color: #c4d4ce;
}

.meter-list {
  display: grid;
  gap: 13px;
  margin: 18px 0;
}

.meter-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 12px;
  align-items: center;
}

.meter-row span,
.readout span {
  color: var(--muted);
  font-size: 0.9rem;
}

.meter-row strong,
.readout strong {
  font-size: 0.98rem;
}

.meter {
  grid-column: 1 / -1;
  height: 13px;
  border: 1px solid #48575c;
  border-radius: 999px;
  background: #101619;
  overflow: hidden;
}

.meter i {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  transition: width 0.12s linear;
}

#heatBar {
  background: linear-gradient(90deg, #dca342, var(--danger));
}

#coolantBar {
  background: linear-gradient(90deg, #247cae, var(--cool));
}

#healthBar {
  background: linear-gradient(90deg, #84d764, var(--good));
}

.readout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

.readout div {
  min-height: 72px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  padding: 10px;
}

.readout strong,
.readout span {
  display: block;
}

.readout strong {
  margin-top: 8px;
}

.controls-line {
  color: var(--muted);
  font-size: 0.92rem;
}

.touch-pad {
  display: none;
  position: absolute;
  inset: auto 12px 12px 12px;
  justify-content: space-between;
  align-items: end;
  pointer-events: none;
}

.touch-pad button {
  pointer-events: auto;
  user-select: none;
  -webkit-user-select: none;
}

.d-pad {
  display: grid;
  grid-template-columns: repeat(3, 48px);
  grid-template-rows: repeat(3, 48px);
  gap: 6px;
}

.d-pad button {
  min-width: 48px;
  min-height: 48px;
  background: rgba(36, 47, 53, 0.84);
  backdrop-filter: blur(3px);
}

.d-pad [data-control="up"] {
  grid-column: 2;
  grid-row: 1;
}

.d-pad [data-control="left"] {
  grid-column: 1;
  grid-row: 2;
}

.d-pad [data-control="down"] {
  grid-column: 2;
  grid-row: 3;
}

.d-pad [data-control="right"] {
  grid-column: 3;
  grid-row: 2;
}

.fire-button {
  width: 86px;
  height: 86px;
  border-radius: 50%;
  border-color: rgba(69, 212, 208, 0.78);
  background: rgba(39, 77, 78, 0.86);
  box-shadow: 0 0 0 4px rgba(69, 212, 208, 0.16);
}

.touch-pad button.is-held {
  transform: translateY(1px);
  border-color: var(--cool);
  background: rgba(54, 91, 93, 0.92);
}

@media (max-width: 880px) {
  .app-shell {
    width: min(100vw - 16px, 760px);
    padding-top: 10px;
  }

  .top-bar {
    align-items: end;
    margin-bottom: 10px;
  }

  .top-bar h1 {
    font-size: 2.25rem;
  }

  .top-bar p {
    font-size: 0.92rem;
  }

  .play-layout {
    grid-template-columns: 1fr;
  }

  .touch-pad {
    display: flex;
  }

  .side-panel {
    padding: 14px;
  }
}

@media (max-width: 520px) {
  .top-bar {
    gap: 10px;
  }

  #restartButton {
    min-width: 96px;
    min-height: 42px;
    padding: 0 12px;
  }

  .d-pad {
    grid-template-columns: repeat(3, 42px);
    grid-template-rows: repeat(3, 42px);
  }

  .d-pad button {
    min-width: 42px;
    min-height: 42px;
  }

  .fire-button {
    width: 72px;
    height: 72px;
  }
}