:root {
  color-scheme: dark;
  --black: #000000;
  --deep-blue: #000033;
  --blue: #0000aa;
  --bright-blue: #0000ff;
  --cyan: #00aaff;
  --red: #dd1111;
  --gray: #aaaaaa;
  --dark-gray: #444444;
  --white: #ffffff;
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: var(--black);
  touch-action: manipulation;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--gray);
  background:
    radial-gradient(circle at 50% -15%, rgba(0, 0, 255, .22), transparent 46%),
    linear-gradient(rgba(0, 0, 170, .08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 170, .08) 1px, transparent 1px),
    #000005;
  background-size: auto, 32px 32px, 32px 32px, auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  -webkit-user-select: none;
  user-select: none;
  overscroll-behavior: none;
}

button { font: inherit; }

.app-shell {
  width: min(100%, 1040px);
  margin: 0 auto;
  padding: max(10px, env(safe-area-inset-top)) 18px max(20px, env(safe-area-inset-bottom));
}

.topbar {
  width: min(100%, 900px);
  margin: 0 auto 10px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.brand { line-height: 1; }
.brand strong {
  display: block;
  color: var(--gray);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(23px, 4.5vw, 38px);
  font-weight: 400;
  text-shadow: 2px 2px 0 var(--blue);
}
.brand span {
  display: block;
  margin-top: 5px;
  color: var(--bright-blue);
  font-size: 9px;
  letter-spacing: .08em;
}

.toolbar { display: flex; gap: 6px; }

button {
  min-height: 34px;
  padding: 7px 10px;
  color: var(--gray);
  border: 1px solid var(--blue);
  border-radius: 0;
  background: linear-gradient(#000033, #00000d);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 255, .2), 2px 2px 0 #000;
  cursor: pointer;
  touch-action: manipulation;
}

button:hover,
button:focus-visible {
  color: var(--white);
  border-color: var(--bright-blue);
  outline: 1px solid var(--gray);
  outline-offset: 2px;
}

button:active { transform: translate(1px, 1px); }

.cabinet {
  position: relative;
  width: min(100%, 900px);
  margin: 0 auto;
  padding: 12px;
  overflow: hidden;
  border: 2px solid var(--gray);
  background:
    repeating-linear-gradient(90deg, transparent 0 46px, rgba(0, 0, 255, .1) 47px 48px),
    linear-gradient(#000038, #00000b 18%, #00000b 82%, #000038);
  box-shadow: 0 0 0 3px #000, 0 0 0 5px var(--blue), 0 18px 55px #000;
}

.scoreboard {
  position: relative;
  display: grid;
  grid-template-columns: 1fr .85fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

.score-card {
  min-height: 44px;
  padding: 5px 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  border: 1px solid var(--dark-gray);
  background: #000;
  box-shadow: inset 0 0 0 1px #111;
}
.score-card span { font-size: 26px; font-weight: 900; }
.score-card b { color: var(--white); font-size: 20px; }
.score-card small { color: var(--gray); text-transform: uppercase; letter-spacing: .08em; }
.x-score span { color: var(--red); text-shadow: 0 0 7px rgba(221, 17, 17, .7); }
.o-score span { color: var(--bright-blue); text-shadow: 0 0 8px rgba(0, 0, 255, .9); }
.draw-score { border-color: var(--blue); }

.screen-bezel {
  position: relative;
  padding: 9px;
  border: 2px solid var(--gray);
  background: #000;
  box-shadow: inset 0 0 26px #000, 0 0 0 2px var(--blue);
}

.screen-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 8 / 5;
  overflow: hidden;
  background: #000;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  touch-action: none;
  outline: none;
}

.glass {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(108deg, rgba(255,255,255,.045), transparent 28%),
    repeating-linear-gradient(0deg, rgba(0,0,0,.13) 0 1px, transparent 1px 3px);
  mix-blend-mode: screen;
  opacity: .5;
}

.action-row {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding-top: 11px;
}

.action-row p {
  margin: 0;
  color: var(--gray);
  text-align: center;
  font-size: 11px;
  line-height: 1.35;
}

.touch-hint {
  margin: 8px 0 0;
  color: #777;
  text-align: center;
  font-size: 9px;
}

.page-footer {
  width: min(100%, 900px);
  margin: 11px auto 0;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: #666;
  font-size: 9px;
}

dialog {
  width: min(92vw, 540px);
  color: var(--gray);
  border: 2px solid var(--bright-blue);
  border-radius: 0;
  background: #00000d;
  box-shadow: 0 0 0 3px #000, 0 20px 75px #000;
}
dialog::backdrop { background: rgba(0,0,0,.86); backdrop-filter: blur(2px); }
dialog form { padding: 10px 14px 16px; }
dialog h2 { margin: 5px 0 18px; color: var(--white); }
dialog p { line-height: 1.55; }
.dialog-close { float: right; padding: 3px 9px; font-size: 20px; }
.help-grid { display: grid; grid-template-columns: auto 1fr; gap: 9px 15px; align-items: center; }
kbd { min-width: 72px; padding: 4px 7px; color: var(--white); border: 1px solid var(--blue); background: #000; text-align: center; }
.help-note { color: #888; font-size: 11px; }

@media (max-width: 720px), (hover: none), (pointer: coarse) {
  .app-shell { padding-inline: 7px; }
  .topbar { align-items: center; }
  .toolbar { gap: 4px; }
  .toolbar button { min-height: 38px; padding: 6px 8px; font-size: 10px; }
  .cabinet { padding: 8px; }
  .screen-bezel { padding: 5px; }
  .scoreboard { margin-bottom: 7px; }
  .score-card { min-height: 37px; padding: 3px 7px; }
  .score-card span { font-size: 21px; }
  .score-card b { font-size: 17px; }
  .score-card small { font-size: 8px; }
  .action-row { gap: 7px; padding-top: 8px; }
  .action-row button { min-height: 44px; padding-inline: 8px; font-size: 10px; }
  .action-row p { font-size: 9px; }
  .touch-hint { display: none; }
  .page-footer { display: none; }
}

@media (max-width: 470px) {
  .brand strong { font-size: 20px; }
  .brand span { font-size: 7px; }
  #sound-button { width: 38px; overflow: hidden; color: transparent; position: relative; }
  #sound-button::after { content: "♪"; position: absolute; inset: 0; display: grid; place-items: center; color: var(--gray); font-size: 17px; }
  .score-card { gap: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}