:root {
  color-scheme: dark;
  --bg: #07110f;
  --surface: #0c1815;
  --surface-2: #11211d;
  --surface-3: #172924;
  --text: #f0f4e8;
  --muted: #93a49c;
  --faint: #60736b;
  --line: #243832;
  --lime: #c8ff64;
  --lime-deep: #9fd943;
  --purple: #a78bfa;
  --board: #091310;
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px),
    var(--bg);
  background-size: 48px 48px;
  color: var(--text);
  font: 15px/1.55 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input, select { font: inherit; }
button, select, input[type="range"] { accent-color: var(--lime); }
button, a, select, input { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, canvas:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}
.shell { width: min(1240px, calc(100% - 40px)); margin-inline: auto; }
.ambient { position: fixed; z-index: -1; border-radius: 999px; filter: blur(120px); opacity: .13; pointer-events: none; }
.ambient-one { width: 520px; height: 520px; top: -240px; right: -80px; background: var(--lime); }
.ambient-two { width: 400px; height: 400px; top: 38%; left: -260px; background: var(--purple); opacity: .09; }

.site-header { display: flex; align-items: center; justify-content: space-between; padding-block: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); font-weight: 750; letter-spacing: .03em; text-decoration: none; }
.brand-mark { display: grid; grid-template-columns: repeat(2, 7px); gap: 3px; padding: 5px; border: 1px solid #567167; border-radius: 6px; transform: rotate(45deg); }
.brand-mark i { width: 7px; height: 7px; background: var(--lime); }
.brand-mark i:nth-child(2), .brand-mark i:nth-child(3) { opacity: .3; }
.rule-pill { display: inline-flex; align-items: center; gap: 8px; margin: 0; border: 1px solid var(--line); border-radius: 999px; padding: 7px 12px; color: var(--muted); font: 650 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.rule-pill span { width: 6px; height: 6px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 10px var(--lime); }

.hero { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(280px, .75fr); align-items: end; gap: 8vw; padding: clamp(70px, 10vw, 140px) 0 clamp(80px, 11vw, 150px); }
.eyebrow { margin: 0 0 18px; color: var(--lime); font-size: 11px; font-weight: 800; letter-spacing: .2em; }
h1, h2, p { text-wrap: pretty; }
h1 { margin: 0; font-size: clamp(52px, 8.1vw, 112px); font-weight: 520; line-height: .93; letter-spacing: -.07em; }
h1 em { color: var(--lime); font-family: Georgia, "Times New Roman", serif; font-weight: 400; }
.hero-copy { padding-bottom: 5px; }
.hero-copy p { margin: 0 0 28px; color: var(--muted); font-size: clamp(15px, 1.4vw, 18px); line-height: 1.8; }
.hero-copy a { display: inline-flex; gap: 14px; color: var(--text); font-weight: 700; text-decoration: none; }
.hero-copy a span { color: var(--lime); }

.laboratory { scroll-margin-top: 24px; border: 1px solid var(--line); border-radius: 30px; background: rgba(10, 24, 20, .78); box-shadow: 0 34px 100px rgba(0,0,0,.28); overflow: hidden; }
.lab-heading { display: flex; align-items: flex-end; justify-content: space-between; padding: 30px 34px 24px; border-bottom: 1px solid var(--line); }
.lab-heading .eyebrow { margin-bottom: 8px; }
.lab-heading h2 { margin: 0; font-size: clamp(25px, 3vw, 38px); font-weight: 580; letter-spacing: -.04em; }
.run-state { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 13px; }
.state-dot { width: 8px; height: 8px; border-radius: 50%; background: #81918a; }
.run-state.running { color: var(--lime); }
.run-state.running .state-dot { background: var(--lime); box-shadow: 0 0 0 5px rgba(200,255,100,.1), 0 0 16px rgba(200,255,100,.6); }
.workspace { display: grid; grid-template-columns: minmax(0, 1.75fr) minmax(310px, .75fr); }
.board-panel { min-width: 0; padding: 28px; border-right: 1px solid var(--line); }
.board-wrap { position: relative; width: 100%; aspect-ratio: 3 / 2; min-height: 300px; overflow: hidden; border: 1px solid #2b433b; border-radius: 17px; background: var(--board); box-shadow: inset 0 0 60px rgba(0,0,0,.35); touch-action: none; }
#game-board { display: block; width: 100%; height: 100%; cursor: crosshair; touch-action: none; }
.board-hint { position: absolute; right: 14px; bottom: 12px; border: 1px solid rgba(255,255,255,.08); border-radius: 999px; padding: 6px 10px; background: rgba(4,12,10,.72); color: var(--faint); font-size: 10px; pointer-events: none; backdrop-filter: blur(8px); }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 18px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.018); }
.metrics div { padding: 12px 16px; }
.metrics div + div { border-left: 1px solid var(--line); }
.metrics span { display: block; color: var(--faint); font-size: 10px; letter-spacing: .1em; }
.metrics strong { display: block; margin-top: 2px; color: var(--text); font: 650 18px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; }
.metrics div:nth-child(2) strong { color: var(--lime); }

.control-panel { padding: 28px; background: rgba(17,33,29,.56); }
.primary-actions, .secondary-actions { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; gap: 9px; border: 1px solid #324940; border-radius: 11px; padding: 0 16px; background: var(--surface-2); color: var(--text); font-weight: 720; cursor: pointer; transition: border-color .18s ease, background .18s ease, transform .18s ease; text-decoration: none; }
.button:hover { border-color: #557064; background: var(--surface-3); }
.button:active { transform: translateY(1px); }
.button-primary { border-color: var(--lime); background: var(--lime); color: #13200d; }
.button-primary:hover { border-color: #dcff9b; background: #dcff9b; }
.button-icon { min-width: 72px; }
.button-quiet { color: var(--muted); background: transparent; }
.play-icon { width: 0; height: 0; border-top: 5px solid transparent; border-bottom: 5px solid transparent; border-left: 8px solid currentColor; }
.button[aria-pressed="true"] .play-icon { width: 8px; height: 10px; border: 0; border-left: 3px solid currentColor; border-right: 3px solid currentColor; }
.control-group { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line); }
.label-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 11px; color: var(--muted); font-size: 12px; }
.label-row output, .inline-output { color: var(--text); font: 600 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
input[type="range"] { width: 100%; height: 4px; margin: 7px 0; background: #33483f; cursor: pointer; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.two-column label { position: relative; color: var(--muted); font-size: 11px; }
.two-column select { width: 100%; height: 41px; margin-top: 7px; border: 1px solid #324940; border-radius: 9px; padding: 0 31px 0 10px; background: #0c1915; color: var(--text); }
.inline-output { position: absolute; top: 2px; right: 0; }
.two-column input[type="range"] { margin-top: 19px; }
.secondary-actions { grid-template-columns: 1fr 1fr; margin-top: 14px; }
.presets { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line); }
.presets .label-row > span { color: var(--text); font-weight: 700; }
.presets small { color: var(--faint); }
.preset-list { display: grid; gap: 8px; }
.preset { display: grid; grid-template-columns: 54px 1fr; align-items: center; gap: 11px; width: 100%; min-height: 65px; border: 1px solid #2c433a; border-radius: 11px; padding: 7px; background: rgba(7,17,15,.55); color: var(--text); text-align: left; cursor: pointer; transition: border-color .18s ease, background .18s ease; }
.preset:hover { border-color: #658073; background: var(--surface-2); }
.preset > span:last-child { display: grid; }
.preset strong { font-size: 13px; }
.preset small { margin-top: 2px; font-size: 10px; }
.preset-art { position: relative; display: block; width: 50px; height: 50px; border-radius: 7px; background-color: #09130f; background-image: linear-gradient(#1c3028 1px, transparent 1px), linear-gradient(90deg, #1c3028 1px, transparent 1px); background-size: 10px 10px; }
.preset-art::after { content: ""; position: absolute; width: 8px; height: 8px; background: var(--lime); box-shadow: 10px 0 var(--lime), 20px 0 var(--lime); }
.glider-art::after { left: 21px; top: 11px; box-shadow: 10px 10px var(--lime), -10px 20px var(--lime), 0 20px var(--lime), 10px 20px var(--lime); }
.pulsar-art::after { left: 11px; top: 11px; box-shadow: 10px 0 var(--lime), 30px 0 var(--lime), 0 10px var(--lime), 30px 10px var(--lime), 0 30px var(--lime), 10px 30px var(--lime), 30px 30px var(--lime); }
.ship-art::after { left: 11px; top: 11px; box-shadow: 20px 0 var(--lime), 30px 10px var(--lime), 0 20px var(--lime), 30px 20px var(--lime), 10px 30px var(--lime), 20px 30px var(--lime), 30px 30px var(--lime); }

.rules { display: grid; grid-template-columns: .8fr 1.2fr; gap: 9vw; padding: clamp(100px, 13vw, 180px) 0; }
.rules h2 { margin: 0; font-size: clamp(34px, 4.8vw, 62px); font-weight: 520; line-height: 1.08; letter-spacing: -.055em; }
.rules ol { margin: 0; padding: 0; list-style: none; }
.rules li { display: grid; grid-template-columns: 48px 1fr; gap: 15px; padding: 19px 0; border-top: 1px solid var(--line); }
.rules li:last-child { border-bottom: 1px solid var(--line); }
.rules li > span { color: var(--lime); font: 600 11px/1.8 ui-monospace, SFMono-Regular, Menlo, monospace; }
.rules strong { font-size: 17px; }
.rules p { margin: 3px 0 0; color: var(--muted); font-size: 13px; }
footer { display: flex; justify-content: space-between; gap: 24px; padding: 25px 0 40px; border-top: 1px solid var(--line); color: var(--faint); font-size: 11px; }
footer p { margin: 0; }
footer p:first-child { color: var(--muted); font-weight: 700; }

.error-page { display: grid; place-items: center; padding: 24px; }
.error-card { width: min(520px, 100%); border: 1px solid var(--line); border-radius: 28px; padding: clamp(35px, 8vw, 68px); background: var(--surface); text-align: center; box-shadow: 0 35px 100px rgba(0,0,0,.3); }
.error-card h1 { color: var(--lime); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.error-card > p:not(.eyebrow) { margin: 18px 0 30px; color: var(--muted); }
.error-card .button { width: fit-content; margin-inline: auto; }
.error-grid { display: block; width: 74px; height: 74px; margin: 0 auto 28px; background-image: linear-gradient(#456056 2px, transparent 2px), linear-gradient(90deg, #456056 2px, transparent 2px); background-size: 18px 18px; opacity: .7; transform: rotate(45deg); }

@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; gap: 35px; }
  .hero-copy { width: min(560px, 100%); }
  .workspace { grid-template-columns: 1fr; }
  .board-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .control-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
  .primary-actions, .control-group:first-of-type { grid-column: 1; }
  .two-column, .secondary-actions, .presets { grid-column: 2; }
  .two-column { grid-row: 1 / span 2; margin-top: 0; padding-top: 0; border-top: 0; }
  .presets { grid-row: 3 / span 3; }
}

@media (max-width: 680px) {
  .shell { width: min(100% - 24px, 1240px); }
  .site-header { padding-block: 20px; }
  .hero { padding: 70px 4px 92px; }
  h1 { font-size: clamp(48px, 16vw, 76px); }
  .lab-heading { align-items: center; padding: 22px 18px 18px; }
  .board-panel, .control-panel { padding: 14px; }
  .board-wrap { min-height: 0; border-radius: 12px; }
  .board-hint { display: none; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .metrics div:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .metrics div:nth-child(4) { border-top: 1px solid var(--line); }
  .control-panel { display: block; }
  .two-column { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); }
  .rules { grid-template-columns: 1fr; gap: 55px; padding-block: 110px; }
  footer { flex-direction: column; }
}

@media (max-width: 410px) {
  .rule-pill { display: none; }
  .lab-heading .eyebrow { display: none; }
  .two-column { grid-template-columns: 1fr; }
  .inline-output { top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  .state-dot, .rule-pill span { box-shadow: none !important; }
}