/* Layout: full-window app over a dark mountain backdrop with grain; the portrait game screen is sized to the space left by a slim header, touch controls (touch devices only) and a footer.
   Impulse brand: near-black ground, logo yellow #E4FF43 as the one accent, Archivo Black for display, Space Grotesk for text. Single dark theme. */
:root{
  --bg:#060608;
  --bg-alt:#0c0c10;
  --ink:#f2f2f0;
  --muted:#9a9aa0;
  --line:rgba(255,255,255,.12);
  --key:#16161c;
  --accent:#e4ff43;
  --purple:#9b3aff;
  --glass:rgba(6,6,8,.72);
  --display:'Archivo Black', 'Arial Black', Impact, sans-serif;
  --body:'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme:dark;
}
html,body{height:100%;background:var(--bg);color:var(--ink)}
[hidden]{display:none!important}
body{margin:0;overflow:hidden;font-family:var(--body);-webkit-tap-highlight-color:transparent;overscroll-behavior:none}
#bg{position:fixed;inset:0;width:100%;height:100%;image-rendering:pixelated;z-index:0;pointer-events:none}

.app{position:relative;z-index:1;display:flex;flex-direction:column;height:100%;box-sizing:border-box;
  padding-left:max(16px, env(safe-area-inset-left, 0px));padding-right:max(16px, env(safe-area-inset-right, 0px));
  padding-top:max(8px, env(safe-area-inset-top, 0px));padding-bottom:max(8px, env(safe-area-inset-bottom, 0px))}
.top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 16px;padding-block:4px 8px}
.logo{display:flex;align-items:center;gap:10px;font:14px var(--display);letter-spacing:.02em;white-space:nowrap;color:var(--ink)}
.logo img{display:block;height:22px;width:auto}
.logo img.ba{height:26px}
.logo .home-link{display:block;line-height:0;-webkit-tap-highlight-color:transparent}
.logo .x{color:var(--muted)}
.eyebrow{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:11px;font-weight:500;letter-spacing:.08em;color:var(--muted);text-transform:uppercase;order:3;width:100%;justify-content:center}
.eyebrow b{color:var(--accent);font-weight:600}
.eyebrow .hl{color:var(--accent);font-weight:700;text-shadow:0 0 10px rgba(228,255,67,.55)}
.chip{font:600 11px var(--body);letter-spacing:.06em;color:var(--ink);background:var(--glass);border:1px solid var(--line);border-radius:999px;padding:8px 14px;cursor:pointer}
.chip:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.main{flex:1;min-height:0;display:grid;gap:10px 8px;
  grid-template-columns:auto 1fr auto;grid-template-rows:minmax(0,1fr) auto;
  grid-template-areas:"stage stage stage" "dpad sys ab"}
.stage{grid-area:stage;position:relative;min-height:0;min-width:0;overflow:hidden}
#screen{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:block;image-rendering:pixelated;image-rendering:crisp-edges;
  background:#000;touch-action:none;box-shadow:0 0 0 3px #000, 0 0 0 4px rgba(228,255,67,.55), 0 18px 50px rgba(0,0,0,.7), 0 0 48px rgba(228,255,67,.12)}

html,body{touch-action:manipulation;-webkit-text-size-adjust:100%}
button{font-family:var(--body);touch-action:none;-webkit-user-select:none;user-select:none;cursor:pointer}
.touch{-webkit-user-select:none;user-select:none}
.dpad{grid-area:dpad;align-self:center;width:clamp(92px,28vw,132px);aspect-ratio:1;display:grid;grid-template:repeat(3,1fr)/repeat(3,1fr);filter:drop-shadow(0 4px 0 rgba(0,0,0,.45))}
.dpad button{background:var(--key);border:0;padding:0;color:#4a4a54;font-size:11px}
.dpad .d-up{grid-area:1/2;border-radius:8px 8px 0 0}
.dpad .d-left{grid-area:2/1;border-radius:8px 0 0 8px}
.dpad .d-right{grid-area:2/3;border-radius:0 8px 8px 0}
.dpad .d-down{grid-area:3/2;border-radius:0 0 8px 8px}
.dpad .d-mid{grid-area:2/2;background:var(--key)}
.dpad button.is-down{background:#24242c;color:var(--accent)}
.ab{grid-area:ab;align-self:center;display:flex;gap:10px;padding:6px 8px;border-radius:99px;background:rgba(0,0,0,.25);transform:rotate(-20deg)}
.key{position:relative;display:flex;flex-direction:column;align-items:center}
.key .lbl{position:absolute;top:calc(100% + 8px);font:12px var(--display);color:var(--muted)}
.round{width:clamp(42px,13vw,60px);aspect-ratio:1;border-radius:50%;border:0;padding:0;
  background:var(--accent);box-shadow:0 4px 0 #7d8c16, inset 0 -3px 0 rgba(0,0,0,.15)}
/* a finger that lands just off A or B still counts: the key around the circle takes the touch, 8px wider */
.ab .key{padding:8px;margin:-8px;touch-action:none;-webkit-user-select:none;user-select:none}
.round.is-down{transform:translateY(3px);box-shadow:0 1px 0 #7d8c16}
.sys{grid-area:sys;align-self:center;justify-self:center;display:flex;flex-direction:column;gap:12px;align-items:center}
.pill{position:relative;min-width:58px;padding:8px 10px;border-radius:999px;border:1px solid var(--line);background:var(--key);color:var(--accent);font:600 10px var(--body);letter-spacing:.1em}
.pill::after{content:"";position:absolute;inset:-8px -6px}
.pill.is-down{background:#24242c}

.foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:6px 16px;padding-block:10px 2px}
.cta{display:inline-flex;align-items:center;font:13px var(--display);color:#060608;background:var(--accent);text-decoration:none;padding:12px 20px;border-radius:999px;box-shadow:0 0 28px rgba(228,255,67,.3);letter-spacing:.04em;transition:box-shadow .2s, transform .2s}
.cta:hover{box-shadow:0 0 40px rgba(228,255,67,.55);transform:translateY(-2px)}
.cta:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.cta[hidden]{display:none}
.sponsors{display:flex;align-items:center;gap:14px}
.sponsors a{display:block;border-radius:6px;transition:transform .15s}
.sponsors a:hover{transform:translateY(-2px)}
.sponsors a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.sponsors img{display:block;height:34px;width:auto}
.sponsors .burn{height:40px}
.help{margin:0;font-size:12px;line-height:1.6;color:var(--muted);text-align:center}
.help kbd{font:600 11px var(--body);color:var(--ink);background:var(--key);border:1px solid var(--line);border-radius:4px;padding:1px 5px}
.keys{display:none}

.submit{position:absolute;inset:0;z-index:5;margin:auto;box-sizing:border-box;max-width:460px;max-height:100%;display:flex;flex-direction:column;justify-content:center;gap:10px;
  padding:22px;background:rgba(6,6,8,.96);border:1px solid rgba(228,255,67,.35);border-radius:10px;overflow:auto;user-select:text;-webkit-user-select:text}
.submit .s-title{margin:0;font:20px var(--display);color:var(--accent);line-height:1.2}
.submit .s-score{margin:0;font:600 15px var(--body);color:var(--ink);font-variant-numeric:tabular-nums}
.submit .s-note{margin:0 0 4px;font-size:14px;line-height:1.45;color:var(--muted)}
.submit label{font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--muted);line-height:1.5}
.submit input[type=text],.submit input[type=email]{font:500 16px var(--body);color:var(--ink);background:var(--key);border:1px solid var(--line);border-radius:6px;padding:10px;width:100%;box-sizing:border-box}
.submit input[type=text]{text-transform:uppercase}
.submit input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.submit .chk{display:flex;gap:10px;align-items:flex-start;font-size:14px;font-weight:400;letter-spacing:0;color:var(--ink);line-height:1.4}
.submit .chk input{margin-top:2px;width:18px;height:18px;flex:none;accent-color:var(--accent)}
.submit .field{display:flex;flex-direction:column;gap:6px}
.submit .s-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:6px}
.submit .s-actions button{font-size:13px;padding:12px 20px;border-radius:999px;border:0}
.submit #sSend{background:var(--accent);color:#060608;font-family:var(--display)}
.submit #sSend:disabled{opacity:.6;cursor:wait}
.submit #sSkip{background:transparent;color:var(--muted);border:1px solid var(--line);font-weight:600}
.submit .s-link{font-size:13px;color:var(--muted);text-decoration:underline;text-underline-offset:3px}
.submit .s-link:hover{color:var(--ink)}
.submit .s-status{margin:0;min-height:1.4em;font-size:14px;color:var(--accent)}
.submit .s-status.err{color:#ff6b6b}

/* Mouse and keyboard: no on-screen controls, keyboard help in the footer. */
@media (hover:hover) and (pointer:fine){
  .touch{display:none!important}
  .main{grid-template-columns:1fr;grid-template-rows:minmax(0,1fr);grid-template-areas:"stage"}
  .keys{display:block}
  .logo{font-size:16px}
  .logo img{height:26px}
  .logo img.ba{height:30px}
  .eyebrow{order:0;width:auto}
}
/* Phone held sideways: controls either side of the screen, no header or footer. */
@media (hover:none) and (orientation:landscape) and (max-height:560px){
  .top .eyebrow,.foot{display:none}
  .main{grid-template-columns:auto minmax(0,1fr) auto;grid-template-rows:minmax(0,1fr) auto;grid-template-areas:"dpad stage ab" "dpad stage sys"}
  .dpad{justify-self:center}
  .ab{justify-self:center}
}
/* Touch screens: compact header and footer so the game gets the height. */
@media (hover:none), (pointer:coarse){
  .top{flex-wrap:wrap;padding-block:2px 6px}
  /* the unlock row stays on phones: a slim second line under the logo, like the desktop header */
  .top .eyebrow{font-size:9px;letter-spacing:.04em;gap:2px 10px;margin-top:2px}
  .top .eyebrow b{display:none}
  .logo{font-size:clamp(10px,3.2vw,13px);gap:7px}
  .logo img{height:16px}
  .logo img.ba{height:19px}
  .chip{font-size:10px;padding:6px 10px}
  .main{gap:6px 6px}
  .foot{gap:4px 14px;padding-block:6px 0}
  .cta{font-size:11px;padding:9px 14px;flex:none}
  .sponsors{gap:10px}
  .sponsors img{height:24px}
  .sponsors .burn{height:28px}
  .help{font-size:10px;line-height:1.4;flex-basis:100%}
}
@media (hover:none) and (orientation:landscape) and (max-height:560px){ .top .eyebrow{display:none} }
@media (prefers-reduced-motion:reduce){ .round.is-down,.sponsors a:hover{transform:none} }