:root {
  --forge-canvas: #f5f5fa;
  --forge-surface: #ffffff;
  --forge-raised: #f0f0f8;
  --forge-text: #1a1a2e;
  --forge-body: #3a3a52;
  --forge-muted: #5a5a80;
  --forge-border: #dddde8;
  --forge-strong: #c8c8d8;
  --forge-amber: #f59e0b;
  --forge-amber-ink: #7a4700;
  --forge-purple: #533afd;
  --forge-danger: #c42b2b;
  --forge-focus: 0 0 0 3px rgba(83, 58, 253, .28);
  --forge-space: clamp(1rem, 2vw, 1.5rem);
}

[data-theme="night"] {
  --forge-canvas: #0c0c18;
  --forge-surface: #151526;
  --forge-raised: #202035;
  --forge-text: #f7f7fc;
  --forge-body: #d8d8e8;
  --forge-muted: #b4b4cc;
  --forge-border: #3a3a52;
  --forge-strong: #666682;
  --forge-amber: #ffb52e;
  --forge-amber-ink: #ffc45a;
  --forge-purple: #8b7cff;
  --forge-danger: #ff7a7a;
  --forge-focus: 0 0 0 3px rgba(139, 124, 255, .48);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--forge-canvas); }
body { margin: 0; color: var(--forge-text); background: var(--forge-canvas); font-family: Inter, ui-sans-serif, system-ui, sans-serif; }
a { color: inherit; }
button, canvas { font: inherit; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 20; padding: .75rem 1rem; background: var(--forge-text); color: var(--forge-surface); }
.skip-link:focus { top: 1rem; }
.topbar { min-height: 68px; padding: .75rem clamp(1rem, 4vw, 4rem); border-bottom: 1px solid var(--forge-border); display: flex; align-items: center; justify-content: space-between; gap: 2rem; background: var(--forge-surface); }
.brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; }
.brand span { display: grid; gap: .1rem; }
.brand small { color: var(--forge-muted); font-size: .72rem; }
.topbar nav { display: flex; align-items: center; gap: 1.2rem; font-size: .82rem; font-weight: 700; }
.topbar nav a { text-decoration: none; }
.topbar nav a:hover { text-decoration: underline; text-underline-offset: .25rem; }
main { width: min(1440px, 100%); margin: 0 auto; }
.hero { padding: clamp(2rem, 7vw, 6rem) clamp(1rem, 4vw, 4rem) clamp(2rem, 4vw, 3.5rem); display: grid; grid-template-columns: minmax(0, 1fr) minmax(250px, 390px); gap: clamp(2rem, 6vw, 6rem); align-items: end; }
.eyebrow, .section-label { margin: 0 0 1rem; color: var(--forge-amber-ink); font-size: .75rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 9ch; margin: 0; font-size: clamp(4rem, 11vw, 9.5rem); line-height: .82; letter-spacing: -.075em; }
h1 span { color: var(--forge-amber-ink); }
.lede { max-width: 42rem; margin: 1.5rem 0 0; color: var(--forge-body); font-size: clamp(1rem, 2vw, 1.35rem); line-height: 1.55; }
.release-register { margin: 0; border-top: 4px solid var(--forge-amber); }
.release-register div, .control-register div { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; padding: .85rem 0; border-bottom: 1px solid var(--forge-border); }
dt { color: var(--forge-muted); }
dd { margin: 0; font-weight: 800; text-align: right; }
.play-lab { margin: 0 clamp(1rem, 4vw, 4rem); border-top: 1px solid var(--forge-strong); border-bottom: 1px solid var(--forge-strong); display: grid; grid-template-columns: minmax(250px, .65fr) minmax(0, 1.35fr); }
.game-copy { padding: clamp(1.5rem, 4vw, 3.5rem) clamp(1rem, 3vw, 3rem) clamp(1.5rem, 4vw, 3.5rem) 0; border-right: 1px solid var(--forge-border); }
.game-copy h2, .systems-ledger h2, .evidence h2 { margin: 0; font-size: clamp(2rem, 4vw, 4rem); line-height: .96; letter-spacing: -.04em; }
.game-copy > p:not(.section-label) { color: var(--forge-body); line-height: 1.6; }
.tower-selector { margin: 2rem 0; border-block: 1px solid var(--forge-border); }
.tower-selector button { width: 100%; min-height: 68px; padding: .7rem 0; border: 0; border-bottom: 1px solid var(--forge-border); display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: .8rem; text-align: left; }
.tower-selector button:last-child { border-bottom: 0; }
.tower-selector button[aria-pressed="true"] { background: var(--forge-raised); box-shadow: inset 4px 0 var(--forge-amber); }
.tower-selector button > span:nth-child(2) { min-width: 0; display: grid; gap: .2rem; }
.tower-selector small { color: var(--forge-muted); font-size: .76rem; font-weight: 600; }
.tower-glyph { width: 42px; height: 42px; flex: 0 0 auto; display: grid; place-items: center; background: var(--forge-purple); }
.tower-glyph.rail { background: #0a7a5a; }
[data-theme="night"] .tower-glyph.rail { background: #52d6b0; }
.tower-glyph i { width: 11px; height: 11px; background: var(--forge-surface); }
.tower-glyph.rail i { width: 8px; height: 28px; }
.control-register { margin: 0; font-size: .85rem; }
kbd { padding: .12rem .35rem; border: 1px solid var(--forge-strong); background: var(--forge-raised); font: 700 .76rem ui-monospace, monospace; }
.boundary-note { margin-top: 2rem; padding-left: 1rem; border-left: 4px solid var(--forge-amber); }
.game-stage { min-width: 0; padding: clamp(1.5rem, 3vw, 3rem) 0 clamp(1.5rem, 3vw, 3rem) clamp(1rem, 3vw, 3rem); }
.stage-register { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-block: 1px solid var(--forge-border); }
.stage-register div { min-width: 0; padding: .8rem .65rem; border-right: 1px solid var(--forge-border); }
.stage-register div:last-child { border-right: 0; }
.stage-register span, .stage-register strong { display: block; }
.stage-register span { color: var(--forge-muted); font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; }
.stage-register strong { margin-top: .25rem; font-size: clamp(.85rem, 1.5vw, 1.1rem); overflow-wrap: anywhere; }
.canvas-shell { position: relative; margin-top: 1rem; border: 1px solid var(--forge-strong); background: var(--forge-surface); }
canvas { display: block; width: 100%; height: auto; aspect-ratio: 10 / 7; outline: 0; touch-action: manipulation; }
canvas:focus-visible { box-shadow: inset var(--forge-focus); }
.state-overlay { position: absolute; inset: auto 1rem 1rem 1rem; padding: .8rem 1rem; border-left: 4px solid var(--forge-amber); background: color-mix(in srgb, var(--forge-surface) 94%, transparent); pointer-events: none; }
.state-overlay[hidden] { display: none; }
.state-overlay strong, .state-overlay span { display: block; }
.state-overlay span { margin-top: .2rem; color: var(--forge-body); font-size: .82rem; }
.game-controls { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 1rem; gap: .6rem; }
button { min-height: 46px; padding: .7rem 1rem; border: 1px solid var(--forge-strong); border-radius: 0; color: var(--forge-text); background: var(--forge-surface); font-weight: 800; cursor: pointer; }
.game-controls button:first-child { color: #211400; background: var(--forge-amber); border-color: var(--forge-amber); }
button:hover:not(:disabled) { border-color: var(--forge-purple); }
button:focus-visible { outline: 0; box-shadow: var(--forge-focus); }
button:disabled { cursor: not-allowed; opacity: .45; }
.selection-detail { margin: .9rem 0 0; color: var(--forge-body); font-size: .85rem; font-weight: 750; }
.status-line { min-height: 1.4rem; margin: .35rem 0 0; color: var(--forge-muted); font-size: .82rem; }
.systems-ledger, .evidence { margin: clamp(4rem, 9vw, 8rem) clamp(1rem, 4vw, 4rem); }
.systems-ledger { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem, 6vw, 6rem); }
.systems-ledger dl { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.systems-ledger dl div { padding: 1.25rem 0; border-top: 1px solid var(--forge-border); }
.systems-ledger dl div:nth-child(odd) { padding-right: 1rem; }
.systems-ledger dl div:nth-child(even) { padding-left: 1rem; border-left: 1px solid var(--forge-border); }
.systems-ledger dd { margin-top: .35rem; text-align: left; }
.evidence header { max-width: 54rem; }
.evidence header > p:last-child { color: var(--forge-body); line-height: 1.6; }
.evidence-ledger { margin-top: 2rem; border-top: 4px solid var(--forge-amber); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.evidence-ledger article { padding: 1.5rem; border-right: 1px solid var(--forge-border); border-bottom: 1px solid var(--forge-border); }
.evidence-ledger article:first-child { border-left: 1px solid var(--forge-border); }
.evidence-ledger article > span { color: var(--forge-amber-ink); font-size: .72rem; font-weight: 800; }
.evidence-ledger h3 { margin: 1rem 0 .6rem; }
.evidence-ledger p { color: var(--forge-body); line-height: 1.55; }
.evidence-ledger strong { font-size: .78rem; }
footer { padding: 2rem clamp(1rem, 4vw, 4rem); border-top: 1px solid var(--forge-border); display: flex; justify-content: space-between; gap: 1rem; color: var(--forge-muted); font-size: .8rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 900px) {
  .topbar nav a { display: none; }
  .hero, .play-lab, .systems-ledger { grid-template-columns: 1fr; }
  .game-copy { padding-right: 0; border-right: 0; border-bottom: 1px solid var(--forge-border); }
  .game-stage { padding-left: 0; }
  .evidence-ledger { grid-template-columns: 1fr; }
  .evidence-ledger article { border-left: 1px solid var(--forge-border); }
}

@media (max-width: 560px) {
  .hero { padding-top: 2rem; }
  h1 { font-size: clamp(3.6rem, 23vw, 6rem); }
  .stage-register { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .stage-register div:nth-child(3) { border-right: 0; }
  .stage-register div:nth-child(n+4) { border-top: 1px solid var(--forge-border); }
  .game-controls { grid-template-columns: 1fr 1fr; }
  .systems-ledger dl { grid-template-columns: 1fr; }
  .systems-ledger dl div:nth-child(even) { padding-left: 0; border-left: 0; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }