:root {
  --bg: #07070c;
  --panel: #0f0f18;
  --line: #22223a;
  --ink: #ececf6;
  --muted: #9a9ab8;
  --maze: #2121ff;
  --yellow: #ffff00;
  --pink: #ffb8ff;
  --cyan: #00ffff;
  --focus: #ffff00;
  --pixel: 'Press Start 2P', ui-monospace, monospace;
  --sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  background-image: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(33, 33, 255, .18), transparent 70%);
  color: var(--ink);
  font: 400 15px/1.55 var(--sans);
  min-height: 100svh;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--cyan); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--yellow); color: #000; padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- header ---------- */
.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px max(16px, env(safe-area-inset-left)) 10px;
  max-width: 1180px; margin: 0 auto;
}
.brand { font: 12px/1 var(--pixel); color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 10px; letter-spacing: .02em; }
.brand b { color: var(--yellow); font-weight: 400; }
.brand .dot { width: 12px; height: 12px; border-radius: 50%; background: var(--yellow); clip-path: polygon(100% 18%, 50% 50%, 100% 82%, 100% 100%, 0 100%, 0 0, 100% 0); }
.toggles { display: flex; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 12px;
  background: transparent; color: var(--muted); border: 1px solid var(--line); border-radius: 999px;
  font: 500 13px/1 var(--sans); cursor: pointer;
}
.chip svg { width: 16px; height: 16px; }
.chip[aria-pressed="true"] { color: var(--ink); border-color: #3a3a66; background: #151526; }
.chip:hover { color: var(--ink); }

/* ---------- challenge banner ---------- */
.banner {
  max-width: 1180px; margin: 4px auto 0; padding: 12px 16px;
  border: 1px solid #4a3a10; background: linear-gradient(90deg, #1b1706, #0f0f18);
  border-radius: 12px; width: calc(100% - 32px);
}
.banner p { margin: 0; }
.banner strong { color: var(--yellow); }
.banner.house { border-color: #2a2a55; background: linear-gradient(90deg, #10103a, #0f0f18); }
.banner .msg { color: var(--muted); font-style: italic; margin-top: 4px; overflow-wrap: anywhere; }

/* ---------- stage ---------- */
.stage {
  display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 24px;
  max-width: 1180px; margin: 12px auto 0; padding: 0 16px 24px;
}
.cabinet { display: flex; flex-direction: column; align-items: center; min-width: 0; }
.screen-box {
  position: relative; width: 100%;
  display: grid; place-items: center;
  touch-action: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none;
  cursor: pointer;
}
#screen {
  display: block; image-rendering: pixelated; image-rendering: crisp-edges;
  background: #000;
  box-shadow: 0 0 0 1px #1a1a33, 0 0 0 10px #0b0b14, 0 0 0 11px #20203a, 0 30px 80px -20px rgba(33, 33, 255, .45);
  border-radius: 2px;
}
.scan { display: none; }
body.crt .scan {
  display: block; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 2px, rgba(0, 0, 0, .28) 3px);
  mix-blend-mode: multiply;
}
body.crt #screen { filter: saturate(1.15) contrast(1.05); box-shadow: 0 0 0 1px #1a1a33, 0 0 0 10px #0b0b14, 0 0 0 11px #20203a, 0 0 60px rgba(33, 33, 255, .55); }

.result { margin: 14px 0 0; font: 12px/1.6 var(--pixel); color: var(--yellow); text-align: center; }

.controls { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 18px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px;
  border-radius: 10px; border: 1px solid #34345a; background: #141424; color: var(--ink);
  font: 600 14px/1 var(--sans); cursor: pointer; text-decoration: none;
}
.btn:hover { background: #1b1b30; }
.btn.primary { background: var(--yellow); color: #111; border-color: var(--yellow); }
.btn.primary:hover { background: #fff45a; }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .6; cursor: progress; }
#btn-start { font: 12px/1 var(--pixel); padding: 0 22px; }

.dpad { display: none; }
@media (pointer: coarse) {
  .dpad {
    display: grid; grid-template: repeat(3, 48px) / repeat(3, 48px); gap: 2px; order: -1; width: 100%; justify-content: center;
  }
  .dpad button {
    background: #141424; border: 1px solid #2c2c4c; color: var(--ink); border-radius: 10px; font-size: 16px; touch-action: none;
  }
  .dpad [data-dir="up"] { grid-area: 1 / 2; }
  .dpad [data-dir="left"] { grid-area: 2 / 1; }
  .dpad [data-dir="right"] { grid-area: 2 / 3; }
  .dpad [data-dir="down"] { grid-area: 3 / 2; }
  .dpad button:active { background: var(--maze); }
}

/* ---------- side panels ---------- */
.side { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.panel h2 { font: 11px/1.4 var(--pixel); letter-spacing: .04em; margin: 0 0 14px; color: var(--yellow); text-transform: uppercase; }
.tabs { display: flex; gap: 4px; background: #0a0a12; border: 1px solid var(--line); border-radius: 10px; padding: 3px; margin-bottom: 10px; }
.tabs button { flex: 1; min-height: 34px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font: 600 13px var(--sans); cursor: pointer; }
.tabs [aria-selected="true"] { background: #1c1c33; color: var(--ink); }
.board { list-style: none; margin: 0; padding: 0; font: 12px/1 var(--pixel); }
.board li { display: grid; grid-template-columns: 34px 1fr auto; gap: 10px; align-items: center; padding: 9px 6px; border-bottom: 1px dashed #1f1f36; }
.board li:last-child { border-bottom: 0; }
.board .rk { color: var(--muted); }
.board .in { color: var(--cyan); letter-spacing: .1em; }
.board .sc { color: var(--ink); }
.board li:nth-child(1) .in { color: #ff0000; }
.board li:nth-child(2) .in { color: var(--pink); }
.board li:nth-child(3) .in { color: #ffb851; }
.board li.you { background: #1d1d06; border-radius: 6px; }
.board li.you .sc { color: var(--yellow); }
.board li.empty { display: block; font: 400 14px var(--sans); color: var(--muted); padding: 10px 6px; }
.how dl { margin: 0; display: grid; gap: 8px; }
.how dl div { display: grid; grid-template-columns: 64px 1fr; gap: 10px; }
.how dt { color: var(--muted); font-weight: 500; }
.how dd { margin: 0; }
.how p, .about li { color: var(--muted); font-size: 14px; }
.how p { margin: 14px 0 0; }
.about ul { margin: 0; padding-left: 18px; display: grid; gap: 8px; }
.about b { color: var(--ink); font-weight: 600; }

.foot { max-width: 1180px; margin: 0 auto; padding: 8px 16px 32px; color: #6b6b88; font-size: 12.5px; }
.foot a { color: var(--muted); }

/* ---------- dialog ---------- */
dialog {
  width: min(460px, calc(100vw - 32px)); padding: 22px; border-radius: 16px;
  background: var(--panel); color: var(--ink); border: 1px solid #2d2d4d;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .6);
}
dialog::backdrop { background: rgba(3, 3, 8, .72); backdrop-filter: blur(3px); }
dialog h2 { font: 13px/1.4 var(--pixel); color: var(--yellow); margin: 0 0 8px; }
dialog .sub { color: var(--muted); margin: 0 0 16px; font-size: 14px; }
dialog label { display: block; font-weight: 600; font-size: 14px; margin: 12px 0 6px; }
dialog label span { color: var(--muted); font-weight: 400; }
dialog input, dialog textarea {
  width: 100%; background: #0a0a12; color: var(--ink); border: 1px solid #2d2d4d; border-radius: 10px;
  padding: 11px 12px; font: 16px/1.4 var(--sans); resize: vertical;
}
dialog input:focus, dialog textarea:focus { border-color: var(--yellow); outline: none; box-shadow: 0 0 0 3px rgba(255, 255, 0, .18); }
dialog .count { margin: 4px 0 0; font-size: 12px; color: var(--muted); text-align: right; }
dialog .err { color: #ff8080; min-height: 1em; margin: 6px 0 0; font-size: 14px; }
dialog .row { display: flex; gap: 10px; justify-content: flex-end; margin-top: 14px; }
dialog .row.wrap { flex-wrap: wrap; justify-content: flex-start; }
dialog .row.wrap .btn { flex: 1 1 auto; }

/* ---------- responsive ---------- */
@media (max-width: 920px) {
  .stage { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .top { padding-top: 10px; }
  .brand { font-size: 9px; white-space: nowrap; gap: 8px; }
  .chip span { display: none; }
  .chip { padding: 0 10px; }
  .stage { padding: 0 8px 20px; margin-top: 6px; }
  .controls { gap: 10px; margin-top: 12px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }