@font-face{font-family:"Gloock";src:url(fonts/gloock-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Hanken Grotesk";src:url(fonts/hanken-grotesk-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Hanken Grotesk";src:url(fonts/hanken-grotesk-600.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Martian Mono";src:url(fonts/martian-mono-400.woff2) format("woff2");font-weight:400;font-display:swap}
:root{
  --brass:#c79a3b;--shade:#9c7426;--hi:#e3c474;--ink:#21180e;--velvet:#5c1a24;--steel:#a9b0b3;--enamel:#eef0ea;
  --serif:"Gloock",Georgia,serif;--sans:"Hanken Grotesk",system-ui,sans-serif;--mono:"Martian Mono",ui-monospace,monospace;
  --brush:repeating-linear-gradient(0deg,rgb(255 255 255/.05) 0 1px,transparent 1px 3px,rgb(0 0 0/.03) 3px 4px);
}
*{box-sizing:border-box}
html{background:var(--brass);color:var(--ink)}
body{margin:0;font:400 1.0625rem/1.6 var(--sans);background:var(--brush),var(--brass)}
a{color:var(--ink);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
code{font:400 .82em var(--mono)}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--enamel);padding:.5rem 1rem;z-index:9}
.skip:focus{left:1rem}
.engr{text-shadow:0 1px 0 rgb(255 236 180/.45),0 -1px 0 rgb(33 24 14/.35)}

/* ---------- the wall ---------- */
.wall{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;padding:6px;background:var(--shade);grid-auto-rows:clamp(92px,9.4vw,150px)}
.door,.plate{position:relative;background:var(--brush),var(--brass);border:1px solid var(--ink);box-shadow:inset 1px 1px 0 var(--hi),inset -1px -1px 0 var(--shade)}
.door{perspective:500px}
.door::before,.door::after,.plate::before,.plate::after{content:"";position:absolute;width:6px;height:6px;border-radius:50%;background:var(--shade);box-shadow:inset 1px 1px 0 var(--ink);top:7px}
.door::before,.plate::before{left:7px}.door::after,.plate::after{right:7px}
.no{position:absolute;left:50%;top:14%;transform:translateX(-50%);background:var(--enamel);border:1px solid var(--ink);padding:1px 10px;font:400 .95rem/1.35 var(--serif);letter-spacing:.04em;white-space:nowrap}
.kh{position:absolute;top:48%;width:12px;height:22px}
.kh:nth-of-type(2){left:calc(50% - 26px)}.kh:nth-of-type(3){left:calc(50% + 14px)}
.kh::before{content:"";position:absolute;left:1px;top:0;width:10px;height:10px;border-radius:50%;background:var(--ink)}
.kh::after{content:"";position:absolute;left:3px;top:7px;width:6px;height:13px;background:var(--ink);clip-path:polygon(25% 0,75% 0,100% 100%,0 100%)}
.win{position:absolute;right:8px;bottom:8px;background:var(--ink);color:var(--hi);font:400 .62rem/1 var(--mono);padding:5px 6px;letter-spacing:.02em;transform-origin:50% 0;backface-visibility:hidden}
.win.flip{animation:flip .5s ease-in-out}
.crit .win{background:var(--velvet);color:var(--enamel)}
.warn .win{background:var(--enamel);color:var(--ink);outline:1px solid var(--ink)}
.bmc{position:absolute;left:9px;bottom:8px;font:600 .62rem/1 var(--sans);letter-spacing:.08em;text-transform:uppercase;opacity:.8}
@keyframes flip{0%{transform:rotateX(0)}50%{transform:rotateX(90deg)}100%{transform:rotateX(0)}}

.plate{grid-column:2/span 4;grid-row:2/span 3;padding:clamp(1.2rem,3vw,2.6rem) clamp(1.2rem,4vw,3.4rem);display:flex;flex-direction:column;justify-content:flex-start;border-width:2px}
.plate::before,.plate::after{top:auto;bottom:10px}
.eyebrow{margin:0 0 .6rem;font:600 .78rem/1.2 var(--sans);letter-spacing:.14em;text-transform:uppercase}
h1{margin:0;font:400 clamp(2.4rem,5.4vw,4.6rem)/1.02 var(--serif);letter-spacing:-.01em;text-shadow:0 1px 0 rgb(255 236 180/.5),0 -1px 0 rgb(33 24 14/.4)}
.lede{max-width:36em;margin:.9rem 0 1.3rem;font-size:clamp(1.02rem,1.5vw,1.2rem)}
.cta{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.cmd{background:var(--ink);color:var(--hi);padding:.7rem .9rem;font-size:.76rem;max-width:100%;overflow-x:auto;white-space:nowrap}
.btn{display:inline-flex;align-items:center;min-height:44px;padding:0 1rem;border:1px solid var(--ink);background:var(--enamel);font-weight:600;text-decoration:none}
.btn:hover{background:var(--ink);color:var(--enamel)}

/* ---------- drawers ---------- */
main{padding:clamp(1.5rem,4vw,3rem) clamp(.75rem,3vw,2.5rem) 2rem;max-width:1180px;margin:0 auto;perspective:1400px}
.drawer{margin:0 0 clamp(1.6rem,4vw,2.8rem);transform-origin:50% 0;transition:transform .9s cubic-bezier(.2,.7,.2,1)}
.js .drawer:not(.out){transform:translateZ(-160px) rotateX(9deg)}
.front{display:flex;align-items:center;justify-content:space-between;height:46px;padding:0 1rem;background:var(--brush),var(--shade);border:1px solid var(--ink);box-shadow:inset 1px 1px 0 var(--hi)}
.handle{width:120px;height:12px;border:2px solid var(--ink);border-top:0;background:var(--steel)}
.boxno{font:400 1.05rem/1 var(--serif);letter-spacing:.06em;background:var(--enamel);border:1px solid var(--ink);padding:3px 10px}
.body{background:var(--brush),var(--brass);border:1px solid var(--ink);border-top:0;padding:clamp(1.1rem,3vw,2.4rem)}
.body.two{display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(1rem,3vw,2.5rem);align-items:start}
h2{margin:0 0 .8rem;font:400 clamp(1.7rem,3.2vw,2.5rem)/1.1 var(--serif);text-shadow:0 1px 0 rgb(255 236 180/.45)}
h2 code{font-size:.6em}
p{margin:0 0 1rem;max-width:44em}
.term,.mono{font:400 .78rem/1.65 var(--mono)}
.term{margin:1rem 0 0;background:var(--ink);color:var(--enamel);padding:1rem 1.1rem;overflow-x:auto;white-space:pre;border-left:6px solid var(--shade)}
.pr{color:var(--hi)}
.quirks{width:100%;margin-top:1.5rem;border-collapse:collapse;font-size:.9rem;display:block;overflow-x:auto}
.quirks caption{text-align:left;font:400 1.15rem var(--serif);padding-bottom:.4rem}
.quirks th,.quirks td{border:1px solid var(--ink);padding:.45rem .6rem;text-align:left;vertical-align:top}
.quirks thead th{background:var(--enamel);font-weight:600}
.quirks td{font:400 .76rem/1.5 var(--mono)}
.keys-list{padding-left:1.2rem;margin:0 0 1rem}.keys-list li{margin-bottom:.6rem}

/* ---------- the interactive box ---------- */
.vault{display:grid;gap:1rem}
.box{position:relative;aspect-ratio:16/10;perspective:1100px;background:var(--ink);border:2px solid var(--ink)}
.inside{position:absolute;inset:0;background:var(--velvet);color:var(--enamel);padding:1.1rem;overflow:auto}
.inside .mono{white-space:pre-wrap;overflow-wrap:anywhere;margin:0;font-size:.76rem}
.bigdoor{position:absolute;inset:0;background:var(--brush),var(--brass);border:1px solid var(--ink);box-shadow:inset 2px 2px 0 var(--hi),inset -2px -2px 0 var(--shade);transform-origin:0 50%;transition:transform 1.1s cubic-bezier(.3,.1,.2,1);backface-visibility:hidden}
.vault.open .bigdoor{transform:rotateY(-108deg)}
.no.big{font-size:1.6rem;top:12%}
.lock{position:absolute;top:50%;width:54px;height:54px;margin-top:-27px;border-radius:50%;background:var(--shade);border:2px solid var(--ink)}
.la{left:calc(50% - 74px)}.lb{left:calc(50% + 20px)}
.lock::before{content:"";position:absolute;left:21px;top:12px;width:12px;height:12px;border-radius:50%;background:var(--ink)}
.lock::after{content:"";position:absolute;left:23px;top:20px;width:8px;height:20px;background:var(--ink);clip-path:polygon(30% 0,70% 0,100% 100%,0 100%)}
.key{position:absolute;z-index:1;left:50%;top:50%;width:14px;height:44px;margin:-42px 0 0 -7px;transform-origin:50% 95%;transition:transform .45s cubic-bezier(.4,1.6,.5,1);opacity:0}
.key::before{content:"";position:absolute;left:-9px;top:-12px;width:32px;height:24px;border-radius:50%;background:var(--steel);border:2px solid var(--ink)}
.key::after{content:"";position:absolute;left:4px;top:10px;width:6px;height:34px;background:var(--steel);border:1px solid var(--ink)}
.vault[data-a="1"] .la .key,.vault[data-b="1"] .lb .key{opacity:1;transform:rotate(90deg)}
.vault.jam .key{animation:jam .5s}
@keyframes jam{0%,100%{transform:rotate(90deg)}30%{transform:rotate(70deg)}60%{transform:rotate(84deg)}}
.bolt{position:absolute;right:-2px;top:calc(50% - 9px);width:46px;height:18px;background:var(--steel);border:2px solid var(--ink);transition:transform .5s ease}
.vault.unlocked .bolt{transform:translateX(-34px)}
.lab{position:absolute;top:calc(50% + 34px);font:600 .66rem/1 var(--sans);letter-spacing:.12em;text-transform:uppercase}
.la-l{left:calc(50% - 70px)}.lb-l{left:calc(50% + 22px)}
.controls{display:grid;gap:.6rem}
.kbtn,.reset{min-height:48px;padding:.5rem .9rem;border:1px solid var(--ink);background:var(--enamel);color:var(--ink);font:600 .95rem/1.3 var(--sans);text-align:left;cursor:pointer}
.kbtn[aria-pressed="true"]{background:var(--ink);color:var(--hi)}
.kbtn code{white-space:nowrap}
.reset{background:transparent;justify-self:start;font-weight:400;text-decoration:underline;border:0;padding:.5rem 0}
.register{display:grid;gap:.35rem;font-weight:600;font-size:.92rem}
.register input{min-height:48px;border:1px solid var(--ink);background:var(--enamel);color:var(--ink);padding:0 .8rem;font:400 1rem var(--mono)}
.register input:disabled{background:transparent;border-style:dashed;cursor:not-allowed}
.status{margin:0;white-space:pre-wrap;background:var(--ink);color:var(--enamel);padding:.8rem .9rem;min-height:7.2em;font-size:.76rem}

.foot{background:var(--ink);color:var(--hi);padding:2rem clamp(1rem,4vw,3rem);text-align:center}
.foot a{color:var(--enamel)}
.foot p{margin:0 auto}

/* ---------- small screens ---------- */
@media (max-width:860px){
  .wall{grid-template-columns:repeat(2,1fr);grid-auto-rows:auto}
  .door{height:96px}
  .plate{grid-column:1/-1;grid-row:auto;order:-1}
  .door:nth-of-type(n+9){display:none}
  .win,.bmc{font-size:.75rem}
  .no{font-size:1rem}
  .body.two{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .js .drawer:not(.out){transform:none}
}

/* ---------- docs ---------- */
.docbar{display:flex;align-items:center;gap:1rem;padding:.6rem clamp(1rem,3vw,2rem);background:var(--brush),var(--shade);border-bottom:1px solid var(--ink)}
.docbar .mark{display:flex;align-items:center;gap:.5rem;font:400 1.5rem var(--serif);text-decoration:none}
.docbar .mark img{width:56px;height:56px}
.docbar a:last-child{margin-left:auto;font-weight:600}
.docbar .lang{margin-left:auto}.docbar .boxno{white-space:nowrap}@media (max-width:520px){.docbar{gap:.6rem}.docbar .boxno{display:none}.docbar .mark img{width:40px;height:40px}}.docbar .lang+a{margin-left:0}
.docgrid{display:grid;grid-template-columns:230px minmax(0,1fr);gap:clamp(1rem,3vw,3rem);max-width:1180px;margin:0 auto;padding:clamp(1rem,3vw,2.5rem) clamp(.75rem,3vw,2rem)}
.toc{position:sticky;top:1rem;align-self:start;background:var(--enamel);border:1px solid var(--ink);padding:.8rem 1rem}
.toc ol{margin:0;padding-left:1.4rem;font:400 .95rem/1.9 var(--sans)}
main.doc{min-width:0;max-width:none;padding:0;margin:0;perspective:none}
.doc h1{font-size:clamp(2rem,4vw,3rem);margin-bottom:1rem}
.doc h2{margin-top:2.6rem;padding-top:.6rem;border-top:2px solid var(--ink)}
.doc .term{white-space:pre;margin-bottom:1rem}
.ref{width:100%;border-collapse:collapse;margin:0 0 1.2rem;font-size:.95rem;display:block;overflow-x:auto}
.ref th,.ref td{border:1px solid var(--ink);padding:.45rem .6rem;text-align:left;vertical-align:top}
.ref thead th{background:var(--enamel)}
.ref td:first-child{font:400 .78rem/1.55 var(--mono);white-space:nowrap}
@media (max-width:860px){.docgrid{grid-template-columns:minmax(0,1fr)}.toc{position:static}.ref td:first-child{white-space:normal}}
.doc p code,.doc li code{overflow-wrap:anywhere}