:root {
  --bg: #06080e; --panel: rgba(16, 22, 34, .72); --line: rgba(255, 255, 255, .1);
  --ink: #e9edf5; --mute: #9aa6ba; --accent: #4fd6e8; --cta: #ffb347; --ok: #5be3a1; --no: #ff7a7a;
  --sans: "Space Grotesk", system-ui, sans-serif; --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}
* { box-sizing: border-box; }
html, body { overflow-x: clip; max-width: 100%; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; color: var(--ink); font: 17px/1.6 var(--sans);
  /* static poster: also the fallback when the WebGL canvas is not mounted */
  background: radial-gradient(90vw 70vh at 15% 0%, #0d3a4d 0%, transparent 60%),
              radial-gradient(70vw 60vh at 100% 40%, #3a2408 0%, transparent 60%), var(--bg);
  background-attachment: fixed;
}
#bg { position: fixed; inset: 0; width: 100%; height: 100%; z-index: -1; opacity: 0; transition: opacity 1.2s; }
#bg.on { opacity: 1; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 99; background: var(--cta); color: #000; padding: 8px 12px; border-radius: 6px; }
:focus-visible { outline: 2px solid var(--cta); outline-offset: 3px; }
a { color: var(--accent); }
code, .mono { font-family: var(--mono); font-size: .86em; }
code { background: rgba(255, 255, 255, .07); padding: .1em .35em; border-radius: 4px; }

.hud {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 20px;
  padding: 10px 20px; background: rgba(6, 8, 14, .78); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line);
}
.brand { font: 600 14px var(--mono); letter-spacing: .14em; color: var(--ink); text-decoration: none; }
.hud nav { display: flex; gap: 18px; margin-right: auto; }
.hud nav a { color: var(--mute); text-decoration: none; font-size: 14px; }
.hud nav a:hover { color: var(--ink); }
.xp { display: flex; align-items: center; gap: 10px; font: 600 13px var(--mono); margin-left: auto; white-space: nowrap; }
#rank { color: var(--cta); }
.bar, .meter { display: block; width: 110px; height: 6px; border-radius: 3px; background: rgba(255, 255, 255, .12); overflow: hidden; }
.bar i, .meter i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--cta)); transition: width .5s; }

main { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
section { padding: 72px 0; }
.hero { min-height: 82vh; display: flex; flex-direction: column; justify-content: center; }
.eyebrow { font: 600 13px var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
h1 { font-size: clamp(2.4rem, 7vw, 5rem); line-height: 1.02; margin: 0 0 20px; letter-spacing: -.02em; max-width: 14ch; }
h1 span { display: inline-block; opacity: 0; transform: translateY(.5em); animation: up .5s forwards; }
@keyframes up { to { opacity: 1; transform: none; } }
h2 { font-size: clamp(1.7rem, 4vw, 2.6rem); line-height: 1.1; margin: 0 0 14px; letter-spacing: -.01em; max-width: 24ch; }
h3 { font-size: 1.2rem; margin: 44px 0 12px; }
h4 { margin: 0 0 6px; font-size: 1rem; }
.lede { color: var(--mute); font-size: 1.12rem; max-width: 62ch; }
.note { color: var(--mute); font-size: .9rem; }

.btn {
  display: inline-block; padding: 12px 22px; border-radius: 999px; border: 1px solid transparent; cursor: pointer;
  background: var(--cta); color: #111; font: 700 15px var(--sans); text-decoration: none; margin: 6px 8px 0 0;
  transition: transform .25s cubic-bezier(.2, 1.6, .4, 1);
}
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.grid2, .grid3 { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }
.grid3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.card, .prompt, .checkpoint, .console, .builder, fieldset.q {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px; margin: 0; min-width: 0;
}
.card p { margin: 0 0 8px; color: var(--mute); }
.card .mono { color: var(--accent); }

.prompt { position: relative; padding: 0; overflow: hidden; }
.prompt figcaption { padding: 10px 14px; font: 600 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--mute); border-bottom: 1px solid var(--line); }
.prompt pre { margin: 0; padding: 14px; font: 13px/1.55 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; max-height: 340px; overflow-y: auto; }
.copy { position: absolute; top: 5px; right: 6px; padding: 5px 12px; border-radius: 999px; border: 1px solid var(--line); background: #111a28; color: var(--ink); font: 600 12px var(--mono); cursor: pointer; }
.copy.done { color: var(--ok); border-color: var(--ok); }

.steps { padding-left: 1.2em; }
.steps li { margin: 8px 0; }
.timeline { list-style: none; padding: 0; margin: 0 0 24px; border-left: 2px solid var(--line); }
.timeline li { display: grid; grid-template-columns: 110px 1fr; gap: 12px; padding: 12px 0 12px 18px; position: relative; }
.timeline li::before { content: ""; position: absolute; left: -6px; top: 20px; width: 10px; height: 10px; border-radius: 50%; background: var(--cta); }
.timeline time { font: 600 13px var(--mono); color: var(--cta); }

.tablewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); }
table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 600 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--mute); }
tr:last-child td { border-bottom: 0; }
.cost { font-family: var(--mono); color: var(--cta); letter-spacing: -.05em; }

.flags { list-style: none; padding: 0; display: grid; gap: 8px; }
.flags li { padding: 10px 14px; border-radius: 10px; border-left: 3px solid; background: var(--panel); }
.flags .ok { border-color: var(--ok); } .flags .no { border-color: var(--no); } .flags .hold { border-color: var(--cta); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.chips label { display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line); cursor: pointer; font-size: 14px; user-select: none; }
.chips label:has(:checked) { background: rgba(79, 214, 232, .16); border-color: var(--accent); }
.chips input { accent-color: var(--accent); }
.meter { width: 100%; }
.builder .prompt { margin-top: 8px; }

.checkpoint { margin-top: 44px; border-color: rgba(255, 179, 71, .35); }
.checkpoint h3 { margin-top: 0; color: var(--cta); }
fieldset.q { margin: 12px 0; }
fieldset.q legend { font-weight: 700; padding: 0 6px; float: left; width: 100%; margin-bottom: 10px; }
.q time { font: 600 13px var(--mono); color: var(--cta); margin-right: 8px; }
.opt { display: block; width: 100%; text-align: left; margin: 6px 0; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line); background: rgba(255, 255, 255, .03); color: var(--ink); font: inherit; font-size: 15px; cursor: pointer; clear: both; }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt:disabled { cursor: default; opacity: .75; }
.opt.ok { border-color: var(--ok); background: rgba(91, 227, 161, .14); opacity: 1; }
.opt.no { border-color: var(--no); background: rgba(255, 122, 122, .12); opacity: 1; }
.why { color: var(--mute); font-size: .92rem; margin: 8px 0 0; }
.score { font: 600 14px var(--mono); color: var(--cta); }

.console { font-size: 15px; }
.console .head { display: flex; justify-content: space-between; gap: 12px; font: 600 13px var(--mono); color: var(--mute); }
.console .task { font-size: 1.25rem; font-weight: 700; margin: 10px 0 2px; }
.console .where { font: 13px var(--mono); color: var(--accent); margin: 0 0 12px; overflow-wrap: anywhere; }
.console .clock { height: 4px; background: rgba(255, 255, 255, .1); border-radius: 2px; overflow: hidden; margin-bottom: 14px; }
.console .clock i { display: block; height: 100%; width: 100%; background: var(--cta); transform-origin: left; }
.console h4 { font: 600 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--mute); margin: 12px 0 6px; }
.log { margin: 14px 0 0; padding: 12px; border-radius: 10px; background: #03050a; border: 1px solid var(--line); font: 13px/1.6 var(--mono); min-height: 5.5em; white-space: pre-wrap; overflow-wrap: anywhere; }
.log .g { color: var(--ok); } .log .r { color: var(--no); } .log .y { color: var(--cta); }
.big { font-size: clamp(2rem, 6vw, 3.4rem); font-weight: 700; margin: 6px 0; }

#toast { position: fixed; left: 50%; bottom: 24px; transform: translate3d(-50%, 80px, 0); padding: 12px 20px; border-radius: 999px; background: var(--cta); color: #111; font-weight: 700; transition: transform .4s; z-index: 30; pointer-events: none; max-width: 90vw; text-align: center; }
#toast.show { transform: translate3d(-50%, 0, 0); }
footer { text-align: center; color: var(--mute); font: 13px var(--mono); padding: 40px 20px 60px; }

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .45s, transform .45s; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 760px) {
  .hud nav { display: none; }
  .bar { display: none; }
  .hud { gap: 10px; padding: 10px 14px; }
  .brand { letter-spacing: .04em; font-size: 13px; }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
  section { padding: 52px 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  h1 span, .reveal { opacity: 1; transform: none; }
}

.moves { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr)); counter-reset: m; }
.moves li { counter-increment: m; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 14px; color: var(--mute); font-size: .95rem; }
.moves li::before { content: counter(m); display: block; font: 700 1.4rem var(--mono); color: var(--cta); }
.moves strong { color: var(--ink); display: block; }
.walk { list-style: none; padding: 0; counter-reset: w; }
.walk > li { counter-increment: w; position: relative; padding: 0 0 26px 54px; min-width: 0; }
.walk > li::before { content: counter(w); position: absolute; left: 0; top: 0; width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--cta); color: #111; font: 700 15px var(--mono); }
.walk > li > strong { display: block; font-size: 1.1rem; margin-bottom: 4px; }
.walk p { margin: 4px 0 10px; color: var(--mute); max-width: 68ch; }
.walk .prompt, .walk .grid2, .walk .builder, .walk .tablewrap { margin: 10px 0; }
.callout { border: 1px solid rgba(79, 214, 232, .45); background: rgba(79, 214, 232, .08); border-radius: 14px; padding: 16px 18px; margin: 14px 0; }
.callout p { color: var(--ink); margin: 6px 0; }
.tag { display: inline-block; font: 600 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; padding: 3px 9px; border-radius: 999px; border: 1px solid var(--line); color: var(--mute); margin-left: 8px; vertical-align: middle; }
.tag.opt { color: var(--cta); border-color: rgba(255, 179, 71, .5); }
@media (max-width: 760px) { .walk > li { padding-left: 0; padding-top: 46px; } }

/* ---- OS switch: show only the variant for the chosen computer ---- */
html[data-os=mac] .os:not(.os-mac), html[data-os=win] .os:not(.os-win), html[data-os=linux] .os:not(.os-linux) { display: none; }
.ospick { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 18px 0 6px; font: 600 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--mute); }
.osbtn { padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line); background: rgba(255, 255, 255, .03); color: var(--ink); font: 600 14px var(--sans); cursor: pointer; }
.osbtn[aria-pressed=true] { background: var(--accent); border-color: var(--accent); color: #04121a; }
.ospick.mini { margin: 0; gap: 4px; } .ospick.mini .osbtn { padding: 3px 10px; font-size: 12px; }
@media (max-width: 1100px) { .ospick.mini { display: none; } }
/* ---- flagship polish ---- */
.herogrid { display: grid; gap: 40px; align-items: center; }
@media (min-width: 980px) { .herogrid { grid-template-columns: 1.15fr .85fr; } main { max-width: 1160px; } }
.win { background: rgba(3, 5, 10, .82); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; box-shadow: 0 30px 80px rgba(0, 0, 0, .55), 0 0 0 1px rgba(79, 214, 232, .08); min-width: 0; }
.winbar { display: flex; align-items: center; gap: 6px; padding: 10px 12px; border-bottom: 1px solid var(--line); font: 600 11px var(--mono); letter-spacing: .1em; color: var(--mute); text-transform: uppercase; }
.winbar i { width: 9px; height: 9px; border-radius: 50%; background: #2a3550; } .winbar i:first-child { background: var(--no); } .winbar i:nth-child(2) { background: var(--cta); } .winbar i:nth-child(3) { background: var(--ok); }
.winbar span { margin-left: 8px; }
.demo { padding: 14px; font: 13px/1.7 var(--mono); min-height: 268px; }
.demo div { opacity: 0; transform: translateY(4px); transition: opacity .35s, transform .35s; overflow-wrap: anywhere; }
.demo div.in { opacity: 1; transform: none; }
.demo .u { color: var(--ink); } .demo .d { color: var(--accent); } .demo .s { color: var(--ok); } .demo .t { color: var(--cta); text-align: center; }
.mission { position: relative; }
.mission::before { content: attr(data-n); position: absolute; right: 0; top: 28px; font: 700 clamp(5rem, 16vw, 11rem)/1 var(--mono); color: transparent; -webkit-text-stroke: 1px rgba(255, 255, 255, .07); pointer-events: none; z-index: -1; }
.hud nav a.on { color: var(--cta); }
.walk > li::after { content: ""; position: absolute; left: 17px; top: 42px; bottom: 6px; width: 2px; background: linear-gradient(var(--line), transparent); }
@media (max-width: 760px) { .walk > li::after { display: none; } .demo { min-height: 0; } }
.card, .prompt, .builder, .console, fieldset.q, .moves li { backdrop-filter: blur(6px); }
.card { transition: border-color .25s, transform .25s; } .card:hover { border-color: rgba(79, 214, 232, .5); transform: translateY(-2px); }
.console { border-color: rgba(255, 179, 71, .35); box-shadow: 0 20px 60px rgba(0, 0, 0, .4); }
.rankcard { margin-top: 14px; padding: 14px 16px; border: 1px solid var(--ok); border-radius: 12px; background: rgba(91, 227, 161, .08); }
@media (prefers-reduced-motion: reduce) { .demo div { opacity: 1; transform: none; } .card:hover { transform: none; } }