:root {
  color-scheme: dark;
  --ink: #f3f0df;
  --muted: #9d9d91;
  --acid: #b7ff2a;
  --rust: #ef5d37;
  --panel: rgba(12, 16, 14, 0.94);
  --line: rgba(183, 255, 42, 0.28);
}

* { box-sizing: border-box; }

html { background: #080b0a; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% -10%, rgba(183, 255, 42, 0.12), transparent 32rem),
    linear-gradient(135deg, #080b0a 0%, #111512 50%, #070908 100%);
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

button, input { font: inherit; }

.page-shell {
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2.5rem);
}

.masthead {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 1.2rem;
}

.eyebrow, .panel-kicker {
  color: var(--acid);
  font-size: .72rem;
  letter-spacing: .17em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  margin-bottom: 0;
  font-family: Impact, "Arial Black", sans-serif;
  font-size: clamp(2.7rem, 7vw, 6.5rem);
  font-weight: 900;
  letter-spacing: -.04em;
  line-height: .83;
}

h1 span { color: var(--rust); animation: blink 1s steps(2, end) infinite; }

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

.tagline { margin-bottom: 0; color: var(--muted); text-align: right; }

.game-frame {
  position: relative;
  min-height: min(72vh, 900px);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #000;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .55);
}

.game-frame::before {
  position: absolute;
  z-index: 3;
  inset: 0;
  pointer-events: none;
  content: "";
  background: repeating-linear-gradient(0deg, transparent 0 3px, rgba(0, 0, 0, .1) 3px 4px);
}

.game-stage {
  display: grid;
  min-height: inherit;
  place-items: center;
}

#canvas {
  display: block;
  width: 100%;
  height: auto;
  max-height: min(72vh, 900px);
  aspect-ratio: 3 / 2;
  object-fit: contain;
  image-rendering: pixelated;
}

.panel {
  position: absolute;
  z-index: 5;
  top: 50%;
  left: 50%;
  width: min(620px, calc(100% - 2rem));
  padding: clamp(1.4rem, 5vw, 3rem);
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 14px 14px 0 rgba(239, 93, 55, .2);
  transform: translate(-50%, -50%);
}

.panel h2 {
  margin: .45rem 0 .8rem;
  font-family: Impact, "Arial Black", sans-serif;
  font-size: clamp(2rem, 6vw, 4rem);
  letter-spacing: .01em;
  line-height: .95;
  text-transform: uppercase;
}

.panel p { color: var(--muted); line-height: 1.55; }

label {
  display: block;
  margin-bottom: .5rem;
  color: var(--acid);
  font-size: .75rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.input-row { display: flex; gap: .6rem; }

input {
  min-width: 0;
  flex: 1;
  padding: .9rem 1rem;
  border: 1px solid #4e554d;
  outline: 0;
  color: var(--ink);
  background: #050706;
}

input:focus { border-color: var(--acid); box-shadow: 0 0 0 3px rgba(183, 255, 42, .12); }

button {
  padding: .9rem 1.35rem;
  border: 0;
  color: #071000;
  background: var(--acid);
  font-weight: 800;
  text-transform: uppercase;
  cursor: pointer;
}

button:hover { filter: brightness(1.12); }
button:disabled { cursor: wait; opacity: .55; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem 1.1rem;
  margin-top: 1.6rem;
  color: var(--muted);
  font-size: .7rem;
}

kbd {
  display: inline-block;
  min-width: 1.45rem;
  margin-right: .15rem;
  padding: .15rem .3rem;
  border: 1px solid #515850;
  border-bottom-width: 2px;
  color: var(--ink);
  background: #181d19;
  text-align: center;
}

.form-error { min-height: 1.4rem; margin: .65rem 0 0; color: #ff896b !important; font-size: .78rem; }

.score-cards { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; margin: 1.4rem 0; }
.score-cards div { padding: 1rem; border: 1px solid #343b34; background: #070a08; }
.score-cards span { display: block; color: var(--muted); font-size: .7rem; text-transform: uppercase; }
.score-cards strong { display: block; margin-top: .25rem; color: var(--acid); font-size: 2rem; }

.leaderboard-block h3, .leader-strip h2 { font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; }
.leaderboard { margin: 0; padding: 0; list-style: none; counter-reset: rank; }
.leaderboard li {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  gap: .6rem;
  padding: .55rem 0;
  border-bottom: 1px solid #2b302b;
  counter-increment: rank;
}
.leaderboard li::before { color: var(--rust); content: counter(rank, decimal-leading-zero); }
.leaderboard .score { color: var(--acid); font-weight: 800; }

.leader-strip { padding: 1.2rem 0; }
.leader-strip .leaderboard { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 0 1.5rem; }
.leader-strip p { color: var(--muted); }

.loading-fallback {
  position: absolute;
  z-index: 7;
  inset: auto 1rem 1rem;
  padding: 1rem;
  border-left: 3px solid var(--rust);
  background: #21110d;
}
.loading-fallback strong, .loading-fallback span { display: block; }
.loading-fallback span { margin-top: .3rem; color: var(--muted); font-size: .78rem; }

[hidden] { display: none !important; }

@media (max-width: 640px) {
  .masthead { align-items: start; flex-direction: column; gap: .7rem; }
  .tagline { text-align: left; }
  .game-frame { min-height: 78vh; }
  .input-row { flex-direction: column; }
  .panel { box-shadow: 7px 7px 0 rgba(239, 93, 55, .2); }
}

@media (prefers-reduced-motion: reduce) {
  h1 span { animation: none; }
}