:root{--accent:#55d6ff;--accent-soft:#fff1a8;--ink:#10263a;--paper:#f7f6ee;}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--paper)}
body{margin:0;color:var(--ink);background:var(--paper);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased}
button,input,select{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
a{color:inherit}
.site-header{width:min(1180px,calc(100% - 40px));margin:0 auto;min-height:84px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid color-mix(in srgb,var(--ink) 16%,transparent)}
.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;font-weight:900;letter-spacing:-.03em}
.brand-sigil{width:34px;height:34px;border-radius:11px;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-size:.86rem;box-shadow:inset 0 0 0 4px var(--accent)}
.site-header nav,.site-footer nav{display:flex;align-items:center;gap:24px}
.site-header nav a,.site-footer nav a{text-decoration:none;font-size:.88rem;font-weight:750}
.site-header nav a:hover,.site-footer nav a:hover{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}
main{overflow:hidden}
.hero{width:min(1180px,calc(100% - 40px));margin:0 auto;min-height:520px;padding:88px 0 70px;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:64px;align-items:center}
.eyebrow,.section-kicker{margin:0 0 14px;font-size:.76rem;font-weight:900;letter-spacing:.18em;text-transform:uppercase}
.hero h1,.prose-hero h1{margin:0;font-size:clamp(3.2rem,8vw,7rem);line-height:.9;letter-spacing:-.075em;max-width:880px;text-wrap:balance}
.lede{font-size:clamp(1.06rem,2vw,1.32rem);max-width:660px;margin:28px 0 0;color:color-mix(in srgb,var(--ink) 72%,transparent)}
.jump-link{display:inline-flex;align-items:center;justify-content:center;gap:12px;margin-top:28px;padding:14px 22px;border:2px solid var(--ink);border-radius:999px;background:var(--accent);text-decoration:none;font-weight:900;box-shadow:5px 5px 0 var(--ink);transition:transform .16s ease,box-shadow .16s ease}
.jump-link:hover{transform:translate(2px,2px);box-shadow:3px 3px 0 var(--ink)}
.hero-orbit{width:min(360px,90%);aspect-ratio:1;margin:auto;position:relative;border:2px solid var(--ink);border-radius:50%;display:grid;place-items:center;background:var(--accent-soft);box-shadow:14px 14px 0 color-mix(in srgb,var(--ink) 12%,transparent)}
.hero-orbit:before,.hero-orbit:after{content:"";position:absolute;border:2px solid var(--ink);border-radius:50%}
.hero-orbit:before{inset:18%}.hero-orbit:after{inset:36%}
.hero-orbit strong{font-size:clamp(4rem,10vw,7rem);line-height:1;z-index:2}
.hero-orbit span{position:absolute;width:24px;height:24px;border:2px solid var(--ink);border-radius:50%;background:var(--accent);z-index:3}
.hero-orbit span:nth-child(1){left:9%;top:44%}.hero-orbit span:nth-child(2){right:19%;top:13%}.hero-orbit span:nth-child(3){right:5%;bottom:24%}
.play-section{background:var(--ink);color:var(--paper);padding:72px max(20px,calc((100vw - 1180px)/2));position:relative}
.section-kicker{color:var(--accent);margin-bottom:20px}
.game-card{border:1px solid color-mix(in srgb,var(--paper) 24%,transparent);border-radius:28px;background:color-mix(in srgb,var(--paper) 7%,var(--ink));overflow:hidden;box-shadow:0 26px 70px rgba(0,0,0,.24)}
.game-card-header{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;padding:24px 26px;border-bottom:1px solid color-mix(in srgb,var(--paper) 16%,transparent)}
.game-card-header h2{font-size:clamp(1.5rem,4vw,2.5rem);margin:0;letter-spacing:-.04em}
.game-card-header p{margin:5px 0 0;color:color-mix(in srgb,var(--paper) 72%,transparent)}
.game-badge{border:1px solid currentColor;border-radius:999px;padding:8px 12px;font-size:.72rem;font-weight:900;letter-spacing:.08em;white-space:nowrap;color:var(--accent)}
.game-stage{padding:26px}
.primary-button,.secondary-button,.choice-button,.upgrade-button{border:2px solid var(--paper);border-radius:14px;padding:13px 17px;background:var(--accent);color:var(--ink);font-weight:900;cursor:pointer;box-shadow:4px 4px 0 var(--paper);transition:transform .14s ease,box-shadow .14s ease,opacity .14s ease}
.primary-button:hover,.secondary-button:hover,.choice-button:hover,.upgrade-button:hover{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--paper)}
.primary-button:disabled,.secondary-button:disabled,.choice-button:disabled,.upgrade-button:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.secondary-button{background:transparent;color:var(--paper)}
.game-status{min-height:26px;margin:16px 0 0;font-weight:750;color:var(--accent)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.story-grid,.how-preview,.faq{width:min(1080px,calc(100% - 40px));margin:0 auto;padding:100px 0;display:grid;gap:48px}
.story-grid{grid-template-columns:1fr 1fr;border-bottom:1px solid color-mix(in srgb,var(--ink) 16%,transparent)}
.story-grid h2,.how-preview h2,.faq h2,.prose-card h2{font-size:clamp(2rem,5vw,4rem);line-height:1;letter-spacing:-.055em;margin:0}
.story-grid article:last-child{font-size:1.18rem;color:color-mix(in srgb,var(--ink) 72%,transparent)}
.how-preview{grid-template-columns:.8fr 1.2fr;position:relative}
.how-preview ol{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.how-preview li{display:grid;grid-template-columns:56px 1fr;align-items:start;gap:16px;padding:20px 0;border-bottom:1px solid var(--ink)}
.how-preview li span{font-weight:900;color:var(--accent);-webkit-text-stroke:1px var(--ink)}
.how-preview li p{margin:0;font-weight:720}
.text-link{font-weight:900;text-decoration-thickness:2px;text-underline-offset:5px;align-self:end}
.faq{display:block;padding-top:30px}
.faq h2{margin-bottom:40px}
.faq details{border-top:1px solid var(--ink);padding:20px 0}
.faq details:last-child{border-bottom:1px solid var(--ink)}
.faq summary{font-weight:900;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:20px}
.faq summary:after{content:"+";color:var(--accent);font-size:1.4rem;line-height:1}
.faq details[open] summary:after{content:"−"}
.faq details p{max-width:760px;margin:14px 0 0;color:color-mix(in srgb,var(--ink) 72%,transparent)}
.site-footer{width:min(1180px,calc(100% - 40px));margin:80px auto 0;padding:34px 0 50px;border-top:2px solid var(--ink);display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center}
.site-footer p{margin:0}.site-footer .fine-print{grid-column:1/-1;font-size:.78rem;color:color-mix(in srgb,var(--ink) 60%,transparent)}
.prose-main{width:min(940px,calc(100% - 40px));margin:0 auto;padding:80px 0 30px;overflow:visible}
.prose-hero{padding-bottom:54px}
.prose-hero h1{font-size:clamp(3rem,7vw,6rem)}
.prose-hero>p:not(.eyebrow){font-size:1.2rem;max-width:720px;color:color-mix(in srgb,var(--ink) 72%,transparent)}
.prose-card{background:color-mix(in srgb,var(--accent-soft) 60%,var(--paper));border:2px solid var(--ink);border-radius:24px;padding:clamp(24px,6vw,64px);box-shadow:10px 10px 0 var(--ink)}
.prose-card h2{font-size:clamp(1.6rem,4vw,2.7rem);margin:42px 0 16px}.prose-card h2:first-child{margin-top:0}
.prose-card p,.prose-card li{font-size:1.05rem;color:color-mix(in srgb,var(--ink) 78%,transparent)}
.prose-steps{padding-left:1.4rem}.prose-steps li+li{margin-top:12px}
@media (max-width:760px){
  .site-header{width:min(100% - 28px,1180px);min-height:68px}.site-header nav{gap:14px}.site-header nav a:nth-child(2){display:none}
  .hero{width:min(100% - 28px,1180px);grid-template-columns:1fr;min-height:auto;padding:62px 0 58px;gap:48px}.hero-orbit{width:230px}.hero h1{font-size:clamp(3.15rem,17vw,5.4rem)}
  .play-section{padding:52px 14px}.game-card{border-radius:20px}.game-card-header{padding:20px;display:block}.game-badge{display:inline-block;margin-top:14px}.game-stage{padding:18px}
  .story-grid,.how-preview{grid-template-columns:1fr;padding:70px 0;gap:30px}.story-grid,.how-preview,.faq{width:min(100% - 28px,1080px)}
  .site-footer{width:min(100% - 28px,1180px);grid-template-columns:1fr}.site-footer nav{flex-wrap:wrap;gap:14px 20px}.site-footer .fine-print{grid-column:auto}
  .prose-main{width:min(100% - 28px,940px);padding-top:56px}.prose-card{padding:24px;border-radius:18px;box-shadow:6px 6px 0 var(--ink)}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}

.parity-game{max-width:980px;margin:0 auto}.parity-hud{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px}.parity-hud div{padding:11px 14px;border:1px solid rgba(247,246,238,.2);border-radius:12px;background:rgba(255,255,255,.04)}
.parity-hud span{display:block;font-size:.68rem;letter-spacing:.12em;font-weight:900;opacity:.62}.parity-hud strong{font-size:1.45rem}.formula-banner{text-align:center;padding:18px;border:2px solid var(--accent);border-radius:18px;font-size:clamp(1.4rem,5vw,2.5rem);font-weight:950;letter-spacing:-.02em;background:linear-gradient(110deg,rgba(85,214,255,.12),rgba(255,241,168,.06))}.formula-banner span{color:var(--accent)}
.parity-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0}.parity-cards>div{min-height:105px;border:1px solid rgba(247,246,238,.22);border-radius:14px;padding:14px;display:flex;flex-direction:column;justify-content:space-between;background:rgba(255,255,255,.04)}.parity-cards span{font-size:.66rem;font-weight:900;letter-spacing:.1em;opacity:.62}.parity-cards strong{font-size:clamp(1.7rem,5vw,2.5rem)}.parity-cards .is-missing{background:var(--accent);color:var(--ink);border-color:var(--accent)}
.answer-label{display:block;font-size:.73rem;letter-spacing:.1em;font-weight:900;margin:18px 0 7px}.parity-input-row{display:grid;grid-template-columns:1fr auto;gap:10px}.parity-input-row input{min-width:0;border:2px solid var(--paper);border-radius:14px;padding:14px 16px;background:var(--paper);color:var(--ink);font-size:1.15rem;font-weight:850;outline:none}.parity-input-row input:focus{box-shadow:0 0 0 4px rgba(85,214,255,.3)}
.parity-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:18px}.parity-actions>span{margin-left:auto;font-weight:900}.text-button{background:transparent;color:var(--paper);box-shadow:none;border:1px solid rgba(247,246,238,.35)}.education-note{font-size:.77rem;opacity:.58;margin:20px 0 0}.result-panel{margin-top:20px;padding:24px;border-radius:18px;background:var(--paper);color:var(--ink)}.result-panel>strong{display:block;font-size:clamp(2rem,8vw,3.8rem);line-height:1}.result-panel .primary-button{border-color:var(--ink);box-shadow:4px 4px 0 var(--ink);margin-top:10px}
@media(max-width:680px){.parity-hud{grid-template-columns:repeat(2,1fr)}.parity-cards{grid-template-columns:repeat(2,1fr)}.parity-input-row{grid-template-columns:1fr}.parity-actions{align-items:stretch}.parity-actions>*{width:100%;text-align:center}.parity-actions>span{margin-left:0}}