:root {
  color-scheme: dark;
  font-family: "IBM Plex Mono", "Cascadia Code", "Courier New", monospace;
  background: #050a08;
  color: #dce9df;
  --acid: #d9ff6f;
  --green: #74db86;
  --panel: #0b1711;
  --line: #214c37;
  --muted: #7b9b86;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(rgba(116, 219, 134, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(116, 219, 134, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 80% 0%, #173322 0, transparent 32rem),
    #050a08;
  background-size: 32px 32px, 32px 32px, auto, auto;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: #0d1e16;
  color: inherit;
  cursor: pointer;
}

button:hover,
button:focus-visible {
  border-color: var(--acid);
  color: var(--acid);
  outline: none;
}

.game-layout {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 64px 0;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
}

.game-header {
  grid-column: 1 / -1;
  border-left: 3px solid var(--acid);
  padding-left: 20px;
}

.game-header h1 {
  margin: 6px 0;
  color: var(--acid);
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  line-height: 0.9;
  letter-spacing: -0.08em;
  text-transform: uppercase;
}

.game-header p {
  margin: 0;
  color: var(--muted);
}

.game-header .eyebrow {
  color: var(--green);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.game-header .build-version {
  margin-top: 14px;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.build-version code {
  color: var(--acid);
}

.build-version a,
.build-version [data-state="current"] {
  color: var(--green);
}

.build-version [data-state="outdated"] {
  color: #ffca62;
}

.build-version [data-state="unknown"] {
  color: var(--muted);
}

.cursor {
  animation: blink 1s steps(1) infinite;
}

.mode-panel,
.game-panel {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

.mode-panel {
  padding: 20px;
  align-self: start;
}

.section-heading,
.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.section-heading {
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
  padding-bottom: 12px;
}

.section-heading h2 {
  margin: 0;
  font-size: 0.9rem;
  text-transform: uppercase;
}

.section-heading span,
.keyboard-help {
  color: var(--muted);
}

.preset-grid {
  display: grid;
  gap: 8px;
}

.preset-grid button {
  padding: 12px;
  display: flex;
  justify-content: space-between;
  text-align: left;
}

.preset-grid span {
  color: var(--muted);
  font-size: 0.75rem;
}

.custom-mode {
  margin: 20px 0 0;
  padding: 14px;
  border: 1px dashed var(--line);
  display: grid;
  gap: 10px;
}

.custom-mode legend {
  color: var(--green);
  padding: 0 6px;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.custom-mode label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.8rem;
}

.custom-mode input {
  width: 64px;
  border: 1px solid var(--line);
  background: #06100b;
  color: var(--acid);
  padding: 6px;
}

.custom-mode button,
.hud button,
.game-overlay button {
  padding: 9px 12px;
}

.game-panel {
  min-width: 0;
  padding: 16px;
}

.hud {
  min-height: 44px;
  margin-bottom: 12px;
}

.hud p {
  margin: 0;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.75rem;
}

.hud strong {
  color: var(--acid);
  font-size: 1.25rem;
}

.canvas-frame {
  position: relative;
  overflow: auto;
  border: 1px solid var(--line);
  background: #07130e;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
}

.game-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  padding: 20px;
  text-align: center;
  background: rgba(5, 10, 8, 0.88);
  backdrop-filter: blur(3px);
}

.game-overlay[hidden] {
  display: none;
}

.game-overlay strong {
  color: var(--acid);
  font-size: clamp(1.2rem, 4vw, 2rem);
  text-transform: uppercase;
}

.game-overlay span {
  color: var(--muted);
}

.keyboard-help {
  margin: 12px 0 0;
  text-align: center;
  font-size: 0.75rem;
}

.d-pad {
  width: 156px;
  margin: 14px auto 0;
  display: none;
  grid-template-columns: repeat(3, 48px);
  grid-template-areas: ". up ." "left down right";
  gap: 6px;
}

.d-pad button {
  min-height: 48px;
  font-size: 1.2rem;
  touch-action: manipulation;
}

.d-pad .up { grid-area: up; }
.d-pad .left { grid-area: left; }
.d-pad .down { grid-area: down; }
.d-pad .right { grid-area: right; }

@keyframes blink {
  50% { opacity: 0; }
}

@media (max-width: 760px) {
  .game-layout {
    padding: 28px 0;
    grid-template-columns: 1fr;
  }

  .game-header,
  .mode-panel,
  .game-panel {
    grid-column: 1;
  }

  .preset-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .preset-grid button {
    display: grid;
  }

  .d-pad {
    display: grid;
  }

  .keyboard-help {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cursor {
    animation: none;
  }
}