:root{
--bg-canvas:#160f2e;--bg-surface:#24183f;--bg-surface-hover:#2f2052;--text-primary:#ffffff;--text-muted:#d2c9ea;--accent-primary:#e0409b;--accent-secondary:#bef264;--border-subtle:rgba(255,255,255,.14);
--ease-kinetic:cubic-bezier(0.16,1,0.3,1);--shadow-elevation:0 12px 32px -4px rgba(0,0,0,.35);--glow-accent:0 0 24px -4px var(--accent-primary);--glass-backdrop:blur(16px) saturate(180%);
--mono:ui-monospace,Consolas,monospace;--sans:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg-canvas);color:var(--text-primary);font:1.0625rem/1.75 var(--sans);overflow-wrap:anywhere;hyphens:auto}
h1,h2,h3{line-height:1.2;overflow-wrap:anywhere;hyphens:auto;margin:0 0 .8rem}
h1{font-size:clamp(2rem,5vw,3.4rem);letter-spacing:-.02em}
h2{font-size:clamp(1.55rem,3.2vw,2.2rem);letter-spacing:-.01em}
h3{font-family:var(--mono);font-size:.95rem;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-secondary);margin-top:2rem}
p{margin:0 0 1.1rem}
img{max-width:100%;height:auto;display:block;border-radius:4px}
a{color:inherit;text-decoration:none;padding-bottom:2px;background-image:linear-gradient(var(--accent-primary),var(--accent-primary)),linear-gradient(var(--border-subtle),var(--border-subtle));background-size:0% 2px,100% 1px;background-position:0 100%,0 100%;background-repeat:no-repeat;transition:background-size .45s var(--ease-kinetic),color .3s}
a:hover,a:focus-visible{background-size:100% 2px,100% 1px;color:#fff}
:focus-visible{outline:2px solid var(--accent-secondary);outline-offset:3px}
.label,.mono{font-family:var(--mono)}
.label{display:block;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-secondary);margin-bottom:.8rem}
.muted{color:var(--text-muted)}
.wrap{max-width:1200px;margin:0 auto;padding:0 1.25rem}
.col{max-width:68ch;margin:0 auto;padding:0 1.25rem}
/* header */
.site-header{position:relative;border-bottom:1px solid var(--border-subtle);background:rgba(22,15,46,.9);z-index:30}
.bar{max-width:1200px;margin:0 auto;padding:1rem 1.25rem .4rem;display:flex;align-items:center;justify-content:space-between}
.brand{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--mono);font-weight:700;font-size:1.05rem;background:none;padding:0}
.brand-mark{display:inline-grid;grid-template-columns:repeat(2,9px);gap:3px}
.brand-mark i{width:9px;height:9px;border-radius:2px;background:var(--accent-primary)}
.brand-mark i:nth-child(2),.brand-mark i:nth-child(3){background:transparent;border:1px solid var(--accent-secondary)}
.menu-toggle{display:none;background:none;border:1px solid var(--border-subtle);color:#fff;font-size:1.5rem;line-height:1;width:2.6rem;height:2.6rem;border-radius:4px;cursor:pointer}
.nav ul{list-style:none;margin:0;padding:.4rem 1.25rem 1rem;display:flex;justify-content:center;flex-wrap:wrap;gap:.3rem 1.6rem;font-family:var(--mono);font-size:.84rem}
.nav a{background-size:0% 2px,0% 1px;color:var(--text-muted)}
.nav a:hover,.nav a:focus-visible,.nav a[aria-current="page"]{color:#fff;background-size:100% 2px,0% 1px}
/* hero */
.hero{position:relative;padding:2.6rem 0 2.2rem;border-bottom:1px solid var(--border-subtle);background:linear-gradient(120deg,rgba(224,64,155,.18),rgba(22,15,46,0) 40%,rgba(190,242,100,.1) 70%,rgba(224,64,155,.12));background-size:200% 200%;animation:gradientShift 12s ease infinite}
.hero .lede{color:var(--text-muted);font-size:1.12rem;max-width:58ch}
@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
/* sections */
section{padding:3.6rem 0}
.divided{border-top:1px solid var(--border-subtle)}
.glow-zone{position:relative;isolation:isolate}
.glow-zone::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(38rem 26rem at 12% 30%,rgba(224,64,155,.22),transparent 70%),radial-gradient(32rem 24rem at 88% 75%,rgba(190,242,100,.13),transparent 70%);animation:drift 16s ease-in-out infinite alternate}
@keyframes drift{from{opacity:.75;transform:translateY(0)}to{opacity:1;transform:translateY(-14px)}}
/* buttons */
.btn-solid{display:inline-block;margin-top:.6rem;background:var(--accent-primary);color:#160f2e;font-weight:700;padding:.85rem 1.4rem;border-radius:4px;background-image:none;transition:transform .4s var(--ease-kinetic),box-shadow .4s var(--ease-kinetic)}
.btn-solid:hover,.btn-solid:focus-visible{color:#160f2e;transform:translateY(-5px) scale(1.015);box-shadow:var(--shadow-elevation),var(--glow-accent)}
.btn-text{background:none;border:0;color:#fff;font:600 .95rem var(--mono);padding:.3rem 0;cursor:pointer;background-image:linear-gradient(var(--accent-primary),var(--accent-primary));background-size:30% 2px;background-position:0 100%;background-repeat:no-repeat;transition:background-size .45s var(--ease-kinetic)}
.btn-text:hover,.btn-text:focus-visible{background-size:100% 2px}
/* panels, rules */
.panel{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:4px;padding:1.1rem 1.3rem;margin:1.4rem 0}
.panel p:last-child,.panel ol:last-child,.panel ul:last-child{margin-bottom:0}
.difficulty{font-family:var(--mono);font-size:.85rem;color:var(--text-muted);border-left:2px solid var(--accent-secondary);padding-left:.8rem;margin:1rem 0 1.4rem}
ol.clues,ol.steps{padding-left:0;list-style:none;counter-reset:s}
ol.clues li,ol.steps li{counter-increment:s;position:relative;padding:.75rem 0 .75rem 3rem;border-bottom:1px solid var(--border-subtle)}
ol.clues li::before,ol.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:.8rem;font-family:var(--mono);font-size:.85rem;color:var(--accent-primary)}
ol.steps li::before{color:var(--accent-secondary)}
/* rows */
.rows{list-style:none;padding:0;margin:2rem 0;border-top:1px solid var(--border-subtle)}
.row{display:grid;grid-template-columns:3rem 1fr;gap:1.1rem;padding:1.4rem .4rem;border-bottom:1px solid var(--border-subtle);transition:background .4s var(--ease-kinetic),transform .4s var(--ease-kinetic)}
.row:hover{background:linear-gradient(90deg,rgba(224,64,155,.1),transparent 70%);transform:translateX(4px)}
.row .icon{width:3rem;height:3rem;display:grid;place-items:center;border:1px solid var(--border-subtle);border-radius:4px;font-family:var(--mono);color:var(--accent-secondary);font-size:1.2rem}
.row h3{margin:0 0 .3rem;font-size:.9rem}
.row p{margin:0 0 .4rem;color:var(--text-muted)}
/* grids & tables */
.grid-wrap{overflow-x:auto;margin:1.6rem 0}
table.grid{border-collapse:collapse;font-family:var(--mono);font-size:1.35rem}
table.grid caption{caption-side:bottom;font-size:.8rem;color:var(--text-muted);padding-top:.6rem;text-align:left}
table.grid td{width:3.3rem;height:3.3rem;text-align:center;border:1px solid rgba(255,255,255,.32)}
table.grid td.given{font-weight:700}
table.grid td.ask{color:var(--accent-primary);font-weight:700}
table.grid td.empty{color:rgba(255,255,255,.25)}
table.grid.boxed tr:nth-child(2) td{border-bottom:3px solid var(--accent-secondary)}
table.grid.boxed td:nth-child(2){border-right:3px solid var(--accent-secondary)}
table.data{border-collapse:collapse;width:100%;font-size:.95rem}
table.data th,table.data td{border-bottom:1px solid var(--border-subtle);padding:.6rem .7rem;text-align:left}
table.data th{font-family:var(--mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-secondary)}
/* sequence strip */
.strip-wrap{max-width:960px;margin:2rem auto;padding:0 1.25rem}
.strip{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));border:1px solid var(--border-subtle);border-radius:4px;background:rgba(36,24,63,.6)}
.strip li{padding:1.3rem .8rem;text-align:center;border-right:1px solid var(--border-subtle);font-family:var(--mono)}
.strip li:last-child{border-right:0}
.strip .glyph{display:block;font-size:2.2rem;line-height:1.2}
.strip .dots{display:block;color:var(--accent-secondary);letter-spacing:.2em;min-height:1.6em}
.strip .fr{display:block;font-size:.72rem;color:var(--text-muted);letter-spacing:.12em;text-transform:uppercase;margin-top:.4rem}
.strip .ask{color:var(--accent-primary)}
.quad{display:inline-grid;grid-template-columns:1.5rem 1.5rem;gap:4px}
.quad span{width:1.5rem;height:1.5rem;border:1px solid rgba(255,255,255,.4);border-radius:2px}
.quad span.on{background:var(--accent-primary);border-color:var(--accent-primary)}
/* details */
details.answer{border-top:1px solid var(--border-subtle);border-bottom:1px solid var(--border-subtle);margin:1.6rem 0;padding:.2rem 0}
details.answer summary{cursor:pointer;list-style:none;font-family:var(--mono);font-size:.9rem;color:var(--accent-secondary);padding:.9rem 0;display:flex;justify-content:space-between;gap:1rem}
details.answer summary::-webkit-details-marker{display:none}
details.answer summary::after{content:"+";font-size:1.2rem;transition:transform .4s var(--ease-kinetic)}
details.answer[open] summary::after{transform:rotate(45deg)}
details.answer > div{padding:0 0 1rem}
/* quotes & figures */
blockquote.pull{margin:2.6rem 0;padding:.4rem 0 .4rem 1.3rem;border-left:3px solid var(--accent-primary);font-size:clamp(1.25rem,2.4vw,1.55rem);line-height:1.45}
blockquote.pull cite{display:block;margin-top:.6rem;font:normal .8rem var(--mono);color:var(--text-muted)}
.breakout{max-width:1100px;margin:1rem auto 2rem;padding:0 1.25rem}
.breakout img{width:100%;aspect-ratio:16/9;object-fit:cover}
.breakout figcaption{font:.8rem var(--mono);color:var(--text-muted);margin-top:.6rem}
figure{margin:0}
/* forms */
form label{display:block;font:.8rem var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);margin:1.1rem 0 .35rem}
input,select,textarea{width:100%;background:var(--bg-surface);color:#fff;border:1px solid var(--border-subtle);border-radius:4px;padding:.7rem .8rem;font:1rem var(--sans)}
input:focus,select:focus,textarea:focus{border-color:var(--accent-primary);outline:none;box-shadow:var(--glow-accent)}
.actions{display:flex;flex-wrap:wrap;gap:1.6rem;margin-top:1.3rem}
pre.output{white-space:pre-wrap;font:.88rem/1.6 var(--mono);background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:4px;padding:1rem;color:var(--text-muted)}
.status{font:.85rem var(--mono);color:var(--accent-secondary);min-height:1.4em}
/* footer */
.site-footer{border-top:1px solid var(--border-subtle);margin-top:3rem;padding:2.6rem 0 1.4rem;font-size:.92rem;color:var(--text-muted)}
.foot{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:2rem}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{margin-bottom:.4rem}
.foot address{font-style:normal;line-height:1.7}
.foot-base{margin-top:2rem;padding-top:1.2rem;border-top:1px solid var(--border-subtle);font:.8rem var(--mono)}
/* reveal */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease-kinetic),transform .7s var(--ease-kinetic)}
.js .reveal.reveal-visible{opacity:1;transform:translateY(0)}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.js .reveal{opacity:1;transform:none}}
/* breakpoints */
@media (min-width:1025px){.col{padding:0}}
@media (min-width:769px) and (max-width:1024px){section{padding:3rem 0}}
@media (max-width:768px){
.menu-toggle{display:block}
.bar{padding:.9rem 1.25rem}
.nav{position:absolute;top:100%;left:0;right:0;max-height:0;overflow:hidden;background:rgba(36,24,63,.97);backdrop-filter:var(--glass-backdrop);-webkit-backdrop-filter:var(--glass-backdrop);transition:max-height .5s var(--ease-kinetic);border-bottom:1px solid transparent}
.nav.open{max-height:32rem;border-bottom-color:var(--border-subtle);box-shadow:var(--shadow-elevation)}
.nav ul{flex-direction:column;align-items:flex-start;gap:0;padding:.5rem 1.25rem 1rem}
.nav li{width:100%;border-bottom:1px solid var(--border-subtle)}
.nav a{display:block;padding:.8rem 0;font-size:.95rem}
section{padding:2.6rem 0}
}
@media (max-width:480px){
body{font-size:1rem}
table.grid td{width:2.7rem;height:2.7rem;font-size:1.15rem}
.row{grid-template-columns:2.4rem 1fr;gap:.8rem}
.row .icon{width:2.4rem;height:2.4rem}
.strip{grid-template-columns:repeat(2,1fr)}
.strip li{border-bottom:1px solid var(--border-subtle)}
}