:root {
  color-scheme: dark;
  --ink: #edf8ef;
  --muted: #87a39a;
  --panel: rgba(7, 26, 22, .78);
  --line: rgba(169, 255, 218, .13);
  --mint: #62f5c4;
  --mint-soft: #a9ffda;
  --amber: #f5c66b;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #03100e;
  color: var(--ink);
}

* { box-sizing: border-box; }
html { min-width: 320px; background: #03100e; }
body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    linear-gradient(rgba(98, 245, 196, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(98, 245, 196, .025) 1px, transparent 1px),
    radial-gradient(circle at 75% 16%, rgba(28, 121, 97, .17), transparent 36%),
    #03100e;
  background-size: 42px 42px, 42px 42px, auto, auto;
}
button, a { font: inherit; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--mint); outline-offset: 4px; }

.ambient { position: fixed; width: 36rem; height: 36rem; border-radius: 50%; filter: blur(110px); pointer-events: none; opacity: .12; }
.ambient-a { left: -22rem; top: 26rem; background: #18dba0; }
.ambient-b { right: -24rem; bottom: -14rem; background: #d8a63c; }

.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; position: relative; z-index: 1; }
.topbar { height: 96px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand b { display: block; letter-spacing: .16em; font-size: 15px; }
.brand small { display: block; margin-top: 3px; color: #658278; font: 600 9px/1 ui-monospace, monospace; letter-spacing: .19em; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; position: relative; border: 1px solid rgba(98,245,196,.28); border-radius: 10px; background: rgba(98,245,196,.05); transform: rotate(45deg); }
.brand-mark i { position: absolute; display: block; background: var(--mint); box-shadow: 0 0 10px rgba(98,245,196,.6); }
.brand-mark i:nth-child(1) { width: 20px; height: 2px; }
.brand-mark i:nth-child(2) { width: 2px; height: 20px; }
.brand-mark i:nth-child(3) { width: 7px; height: 7px; border-radius: 50%; }
.topbar nav { display: flex; gap: 28px; color: #8ba69c; font-size: 13px; }
.topbar nav a:hover { color: var(--mint-soft); }

.hero { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: end; padding: 72px 0 46px; }
.eyebrow { margin: 0 0 16px; color: #709187; font: 700 10px/1.2 ui-monospace, monospace; letter-spacing: .18em; }
.eyebrow > span { display: inline-block; width: 28px; height: 1px; margin: 0 10px 3px 0; background: var(--mint); box-shadow: 0 0 7px var(--mint); }
.eyebrow strong { color: var(--mint); }
h1 { margin: 0; font-size: clamp(50px, 6.8vw, 92px); line-height: .88; letter-spacing: -.065em; font-weight: 750; }
h1 em { color: transparent; font-style: normal; -webkit-text-stroke: 1px rgba(169,255,218,.47); }
.lede { max-width: 650px; margin: 28px 0 0; color: #90aaa1; font-size: 16px; line-height: 1.7; }
.mini-legend { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 26px; color: #6f8d83; font: 650 10px/1 ui-monospace, monospace; letter-spacing: .07em; }
.mini-legend span { display: inline-flex; align-items: center; gap: 7px; }
.mini-legend i { width: 9px; height: 9px; display: inline-block; }
.legend-reactor { border-radius: 50%; background: var(--amber); box-shadow: 0 0 8px var(--amber); }
.legend-beacon { border: 1px solid var(--mint); transform: rotate(45deg); }
.legend-powered { border-radius: 50%; background: var(--mint); box-shadow: 0 0 8px var(--mint); }

.status-card { min-width: 185px; padding: 10px 22px; border: 1px solid var(--line); border-radius: 16px; background: rgba(8,25,22,.55); backdrop-filter: blur(16px); }
.status-card div { display: flex; justify-content: space-between; gap: 28px; align-items: baseline; padding: 12px 0; border-bottom: 1px solid rgba(169,255,218,.08); }
.status-card div:last-child { border: 0; }
.status-card span { color: #638078; font: 700 9px/1 ui-monospace, monospace; letter-spacing: .13em; }
.status-card strong { font: 700 18px/1 ui-monospace, monospace; color: #dff7ea; }

.game-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 28px; align-items: start; }
.game-card, .briefing { border: 1px solid var(--line); border-radius: 22px; background: var(--panel); box-shadow: 0 28px 80px rgba(0,0,0,.25); backdrop-filter: blur(18px); }
.game-card { padding: 18px; }
.board-wrap { position: relative; max-width: 680px; margin: auto; }
.board {
  --size: 5;
  display: grid;
  grid-template-columns: repeat(var(--size), 1fr);
  aspect-ratio: 1;
  overflow: hidden;
  border: 1px solid rgba(169,255,218,.14);
  border-radius: 13px;
  background:
    radial-gradient(circle at 50% 50%, rgba(245,198,107,.08), transparent 23%),
    rgba(1, 12, 10, .92);
}
.tile {
  appearance: none;
  border: 0;
  border-right: 1px solid rgba(169,255,218,.075);
  border-bottom: 1px solid rgba(169,255,218,.075);
  background: transparent;
  position: relative;
  cursor: pointer;
  transition: background .18s ease, transform .12s ease;
  min-width: 0;
}
.tile:hover { background: rgba(98,245,196,.035); }
.tile:active { transform: scale(.94); }
.wire { position: absolute; inset: 14%; }
.wire i { display: block; position: absolute; }
.wire .hub { width: 12%; aspect-ratio: 1; left: 44%; top: 44%; border-radius: 50%; background: #29453d; }
.wire .arm { background: #29453d; transition: background .2s, box-shadow .2s; }
.wire .north, .wire .south { width: 7%; height: 48%; left: 46.5%; }
.wire .east, .wire .west { height: 7%; width: 48%; top: 46.5%; }
.wire .north { top: 0; }
.wire .east { right: 0; }
.wire .south { bottom: 0; }
.wire .west { left: 0; }
.tile.powered .wire i { background: var(--mint); box-shadow: 0 0 11px rgba(98,245,196,.72); }
.reactor { position: absolute; width: 27%; aspect-ratio: 1; left: 36.5%; top: 36.5%; z-index: 2; border-radius: 50%; background: var(--amber); border: 3px solid #fff1c7; box-shadow: 0 0 8px #fff, 0 0 27px rgba(245,198,107,.8); }
.reactor::after { content: ""; position: absolute; inset: -45%; border: 1px solid rgba(245,198,107,.28); border-radius: 50%; }
.beacon-mark { position: absolute; width: 20%; aspect-ratio: 1; left: 40%; top: 40%; z-index: 2; transform: rotate(45deg); border: 2px solid #587269; background: #0b1e19; transition: all .25s; }
.tile.powered .beacon-mark { border-color: #dfffee; background: var(--mint); box-shadow: 0 0 18px var(--mint); }
.tile.source { background: radial-gradient(circle, rgba(245,198,107,.09), transparent 52%); }

.loading, .win-panel { position: absolute; inset: 0; z-index: 4; display: grid; place-content: center; justify-items: center; border-radius: 13px; background: rgba(2,14,12,.92); backdrop-filter: blur(10px); }
.loading[hidden], .win-panel[hidden] { display: none; }
.loading span { width: 42px; height: 42px; border: 1px solid var(--mint); animation: boot 1.5s ease-in-out infinite; }
.loading p { color: #78958b; font: 700 10px ui-monospace, monospace; letter-spacing: .15em; text-transform: uppercase; }
@keyframes boot { 50% { transform: rotate(135deg) scale(.65); box-shadow: 0 0 35px var(--mint); } 100% { transform: rotate(270deg); } }
.win-panel { text-align: center; background: radial-gradient(circle, rgba(26,99,79,.92), rgba(2,14,12,.97) 65%); }
.win-panel h2 { margin: 0; font-size: clamp(28px, 5vw, 52px); letter-spacing: -.04em; }
.win-score { margin: 28px 0; }
.win-score strong { display: block; color: var(--mint); font: 800 clamp(42px, 8vw, 76px)/1 ui-monospace, monospace; text-shadow: 0 0 24px rgba(98,245,196,.35); }
.win-score span { color: #78958b; font: 700 10px ui-monospace, monospace; letter-spacing: .14em; text-transform: uppercase; }

.progress-track { height: 3px; margin: 18px 4px 0; overflow: hidden; background: rgba(169,255,218,.09); }
.progress-track span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--mint), var(--amber)); box-shadow: 0 0 12px var(--mint); transition: width .35s ease; }
.game-actions { display: flex; gap: 10px; align-items: center; padding-top: 16px; }
.primary, .secondary, .icon-button { height: 44px; border-radius: 9px; padding: 0 18px; border: 1px solid transparent; cursor: pointer; font-weight: 750; font-size: 12px; transition: transform .15s, background .15s; }
.primary { background: var(--mint); color: #042018; }
.primary:hover { background: #b2ffe2; transform: translateY(-1px); }
.secondary { background: rgba(169,255,218,.055); border-color: rgba(169,255,218,.13); color: #b9d2c9; }
.secondary:hover, .icon-button:hover { border-color: rgba(169,255,218,.3); background: rgba(169,255,218,.09); }
.icon-button { width: 44px; margin-left: auto; padding: 0; background: transparent; border-color: rgba(169,255,218,.13); color: var(--mint); font-size: 18px; }

.briefing { padding: 30px; }
.briefing h2 { margin: 0 0 28px; font-size: 28px; line-height: 1.05; letter-spacing: -.035em; }
.briefing ol { list-style: none; margin: 0; padding: 0; }
.briefing li { display: grid; grid-template-columns: 32px 1fr; gap: 13px; padding: 17px 0; border-top: 1px solid rgba(169,255,218,.08); }
.briefing li > span { color: var(--mint); font: 700 10px ui-monospace, monospace; }
.briefing li p { margin: 0; color: #849e95; font-size: 13px; line-height: 1.55; }
.briefing li b { color: #d7e9e1; font-weight: 650; }
.tech-note { margin-top: 24px; padding: 19px; border: 1px solid rgba(245,198,107,.16); border-radius: 12px; background: rgba(245,198,107,.035); }
.tech-note > span { display: block; color: var(--amber); font: 700 9px ui-monospace, monospace; letter-spacing: .15em; }
.tech-note b { display: block; margin-top: 8px; font-size: 14px; }
.tech-note p, .keyboard-note { margin: 8px 0 0; color: #708b82; font-size: 11px; line-height: 1.55; }
.keyboard-note { margin-top: 18px; }

footer { display: flex; justify-content: space-between; gap: 20px; padding: 38px 2px 52px; color: #527168; font: 650 10px ui-monospace, monospace; letter-spacing: .07em; }
footer a { color: #84b5a5; }

@media (max-width: 850px) {
  .hero { grid-template-columns: 1fr; padding-top: 52px; }
  .status-card { display: grid; grid-template-columns: repeat(3, 1fr); padding: 8px 14px; }
  .status-card div { display: block; text-align: center; padding: 10px; border-bottom: 0; border-right: 1px solid rgba(169,255,218,.08); }
  .status-card div:last-child { border: 0; }
  .status-card strong { display: block; margin-top: 6px; }
  .game-layout { grid-template-columns: 1fr; }
  .briefing { display: grid; grid-template-columns: 1fr 1fr; column-gap: 24px; }
  .briefing > .eyebrow, .briefing > h2 { grid-column: 1 / -1; }
  .briefing ol { grid-row: span 2; }
  .tech-note { margin-top: 0; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 22px, 480px); }
  .topbar { height: 74px; }
  .topbar nav { gap: 14px; font-size: 11px; }
  .topbar nav a:first-child { display: none; }
  .brand small { display: none; }
  .hero { gap: 28px; padding: 42px 2px 28px; }
  h1 { font-size: clamp(47px, 16vw, 68px); }
  .lede { margin-top: 21px; font-size: 14px; line-height: 1.6; }
  .mini-legend { gap: 12px; margin-top: 20px; }
  .game-card { padding: 9px; border-radius: 15px; }
  .board { border-radius: 9px; }
  .game-actions { display: grid; grid-template-columns: 1fr 1fr 44px; }
  .primary, .secondary { padding: 0 9px; font-size: 11px; }
  .briefing { display: block; padding: 24px; }
  .briefing h2 { font-size: 25px; }
  .tech-note { margin-top: 20px; }
  footer { flex-wrap: wrap; padding-bottom: calc(28px + env(safe-area-inset-bottom)); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; transition-duration: .001ms !important; }
}