:root{
  color-scheme:dark;
  --night:#141a35; --plum:#4a3a63; --paper:#efe3c8; --paper2:#e2d0a8; --ink:#2e2433; --ink2:#6a5a63;
  --gold:#e6b85c; --amber:#e9964a; --rust:#c4603f; --rustD:#a3432a; --sky:#7aaed0; --skyD:#2f6d96;
  --sage:#8fb57a; --sageD:#4e7d3d; --cream:#f7eedb;
  --hand:"Ink Free","Segoe Print","Bradley Hand","Chalkboard SE",cursive;
  --body:Candara,"Segoe UI","Trebuchet MS","Gill Sans",sans-serif;
  --wob:16px 6px 14px 8px / 8px 14px 6px 16px;
  --wob2:7px 15px 6px 13px / 14px 6px 15px 7px;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;min-height:100%}
body{
  background:
    var(--grain, none),
    radial-gradient(55% 45% at 10% 5%,rgba(107,79,122,.45),transparent 70%),
    radial-gradient(45% 40% at 95% 35%,rgba(44,58,102,.55),transparent 70%),
    radial-gradient(60% 45% at 45% 110%,rgba(122,90,74,.30),transparent 70%),
    var(--night);
  background-attachment:fixed;
  color:var(--cream);font-family:var(--body);font-size:15px;
  padding:16px;display:flex;flex-direction:column;align-items:center;gap:16px;
}
#bg{position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none}

.paper{position:relative;color:var(--ink);background:var(--paper-grain, none),linear-gradient(170deg,#f4e9d1,#e8d9b7);
  border:1.6px solid rgba(46,36,51,.65);border-radius:var(--wob);box-shadow:4px 5px 0 rgba(8,6,18,.42);padding:14px 16px}
.tape::before{content:"";position:absolute;top:-10px;left:50%;width:74px;height:20px;transform:translateX(-50%) rotate(-3deg);
  background:rgba(232,218,178,.82);clip-path:polygon(3% 0,97% 0,100% 25%,97% 50%,100% 75%,97% 100%,3% 100%,0 75%,3% 50%,0 25%)}

.top{width:100%;max-width:min(900px,calc((100vh - 160px) * 1.5));max-width:min(900px,calc((100dvh - 160px) * 1.5));display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:8px;font-family:var(--hand);font-size:24px;color:var(--cream)}
.brand svg{width:34px;height:34px;transform:rotate(-8deg)}
.brand b{color:var(--gold);font-weight:700}
.badge{font-size:13px;padding:5px 12px;transform:rotate(2deg);box-shadow:3px 3px 0 rgba(8,6,18,.42)}

#wrap{position:relative;width:100%;max-width:min(900px,calc((100vh - 160px) * 1.5));max-width:min(900px,calc((100dvh - 160px) * 1.5));border:3px solid var(--ink);border-radius:18px 8px 16px 10px / 10px 16px 8px 18px;
  overflow:hidden;box-shadow:7px 8px 0 rgba(8,6,18,.55),inset 0 0 0 2px rgba(247,238,219,.08)}
#c{display:block;width:100%;height:auto;aspect-ratio:3/2;background:#141a35}

#ov{position:absolute;left:0;top:0;width:900px;height:600px;transform:scale(var(--k,1));transform-origin:0 0;overflow:auto;display:flex;flex-direction:column;justify-content:safe center;align-items:center;padding:22px 32px;
  background:var(--grain, none),rgba(20,26,53,.55)}
.ov-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:30px;align-items:center;width:100%;max-width:830px}
.intro,.outro{display:flex;flex-direction:column;gap:12px}

.ov-grid.solo{grid-template-columns:1fr}
.ov-grid.solo .team{display:none}
.outro-cols{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:18px 24px;align-items:start}
.outro-side{display:flex;flex-direction:column;gap:14px}
.outro .title{font-size:54px}
.outro{gap:10px}
.ov-grid.solo .aviso{columns:2;column-gap:28px}
.aviso h3{break-after:avoid}
.aviso ul{break-inside:avoid-column}
@media (max-width:760px){ .ov-grid.solo .aviso{columns:1} }
.eyebrow{font-family:var(--hand);font-size:18px;color:var(--gold)}
.title{margin:0;font-family:var(--hand);font-weight:700;font-size:64px;line-height:.95;color:var(--cream);text-shadow:3px 3px 0 var(--ink)}
.title span{display:inline-block}
.title .lock{color:var(--gold)}
.scribble{display:block;width:min(330px,80%);height:14px;margin-top:-6px}
.lead{margin:0;color:#e4d9c2;font-size:16px;line-height:1.45;max-width:46ch}
.lead b{color:var(--gold)}
.card-h{font-family:var(--hand);font-size:19px;color:var(--rustD);margin-bottom:4px}
.paper p{margin:0;line-height:1.45;font-size:14.5px;color:var(--ink)}
.paper p + .card-h{margin-top:12px}
.legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:8px;font-size:14px;color:var(--ink2)}
.dot{display:inline-block;width:11px;height:11px;border-radius:50% 45% 55% 50%;margin-right:6px;vertical-align:-1px;border:1.5px solid var(--ink)}
.dot.b{background:var(--sky)} .dot.r{background:var(--rust)}
.b{color:var(--skyD);font-weight:700} .r{color:var(--rustD);font-weight:700}
.info{transform:rotate(-.6deg)}
.formula{font-size:17px;font-weight:700;letter-spacing:.02em;background:rgba(143,181,122,.25);border:1.5px dashed rgba(46,36,51,.45);border-radius:var(--wob2);padding:7px 10px}
.formula sub{font-size:.7em}
.formula .katex-display{margin:.2em 0}
.formula .katex{font-size:1.45em}
.vars{font-size:13.5px!important;color:var(--ink2)!important;margin-top:6px!important}
.katex{font-size:1.08em}

.eq{width:100%;max-width:900px;text-align:center;transform:rotate(-.3deg);padding:8px 16px 10px}
.eq .katex{font-size:1.35em}
.eq p{font-size:13.5px;color:var(--ink2);margin-top:2px}
.levels{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.levels li{display:flex;flex-direction:column;gap:1px;padding:9px 12px 10px}
.levels li:nth-child(1){transform:rotate(-1.4deg)} .levels li:nth-child(2){transform:rotate(.9deg)} .levels li:nth-child(3){transform:rotate(-.5deg)}
.levels .n{font-family:var(--hand);font-size:15px;color:var(--rustD)}
.levels b{font-size:16px}
.levels small{color:var(--ink2);font-size:13px}
.cta{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:4px}
.hint{color:#cfc3ad;font-size:14px;font-style:italic}
button{font-family:var(--hand);font-size:24px;font-weight:700;color:var(--ink);background:var(--amber);border:2.5px solid var(--ink);
  border-radius:var(--wob);padding:6px 28px 9px;box-shadow:4px 4px 0 var(--ink);cursor:pointer;transform:rotate(-1.2deg);transition:transform .1s,box-shadow .1s}
button:hover{transform:rotate(-1.2deg) translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink)}
button:active{transform:rotate(-1.2deg) translate(3px,3px);box-shadow:1px 1px 0 var(--ink)}
button:focus-visible{outline:2.5px dashed var(--gold);outline-offset:5px}

.team{transform:rotate(1.1deg);padding:18px 18px 14px}
.team .constel{display:block;width:100%;height:auto;margin:2px 0 4px}
.team .card-h{font-size:24px;color:var(--ink)}
.members{list-style:none;margin:0;padding:0}
.members li{display:flex;gap:9px;align-items:baseline;padding:7px 2px;border-bottom:1.5px dashed rgba(46,36,51,.28);font-size:15px}
.members li:last-child{border-bottom:0}
.members li::before{content:"★";color:var(--rust);font-size:14px}
.members li:nth-child(odd)::before{transform:rotate(-12deg)}
.team .foot{margin-top:8px;font-size:13.5px;color:var(--ink2);font-style:italic}

#keys{max-width:900px;display:flex;flex-wrap:wrap;justify-content:center;gap:10px 20px;color:#d8ccb4;font-size:14px}
kbd{display:inline-block;min-width:24px;text-align:center;font-family:var(--body);font-weight:700;font-size:12.5px;color:var(--ink);padding:2px 7px;margin-right:3px;
  background:var(--paper);border:1.5px solid var(--ink);border-bottom-width:3px;border-radius:var(--wob2)}
#keys span:nth-child(odd) kbd:nth-child(odd){transform:rotate(-3deg)}
#keys span:nth-child(even) kbd:nth-child(even){transform:rotate(2.5deg)}

.panel{display:flex;flex-direction:column;gap:14px}
.title.small{font-size:50px}
.form{display:flex;flex-direction:column;gap:10px}
.form label{display:flex;flex-direction:column;gap:4px;font-size:14.5px;font-weight:700;color:var(--ink)}
.form input[type=text],.form input[type=email]{font:16px var(--body);color:var(--ink);background:var(--cream);border:1.6px solid var(--ink);border-radius:var(--wob2);padding:7px 10px;width:100%}
.form input:focus-visible{outline:2.5px dashed var(--amber);outline-offset:2px}
.form .check{flex-direction:row;align-items:flex-start;gap:8px;font-weight:400}
.form .check input{width:18px;height:18px;margin:1px 0 0;accent-color:var(--sageD);flex:none}
.paper a{color:var(--skyD);font-weight:700}
.paper .err{color:var(--rustD);font-weight:700;min-height:1.2em}
button.ghost{background:var(--paper);font-size:19px;padding:4px 18px 6px}
button.small{font-size:16px;padding:3px 13px 5px;box-shadow:3px 3px 0 var(--ink)}
.links{display:flex;gap:12px;flex-wrap:wrap}
.who{margin:0;font-size:14.5px;color:#e4d9c2}
.who b{color:var(--gold)}
button.linkbtn,button.linkbtn:hover,button.linkbtn:active{font:inherit;color:var(--gold);background:none;border:0;box-shadow:none;padding:0;transform:none;text-decoration:underline}
.aviso h3{font-family:var(--hand);font-size:19px;font-weight:400;color:var(--rustD);margin:12px 0 4px}
.aviso h3:first-child{margin-top:0}
.aviso ul{margin:0;padding-left:20px;line-height:1.45;font-size:14.5px}
.aviso li{margin:3px 0}
.board table{width:100%;border-collapse:collapse;font-size:14.5px}
.board th{font-family:var(--hand);font-weight:400;font-size:16px;color:var(--rustD);text-align:left;padding:2px 6px;border-bottom:1.5px solid rgba(46,36,51,.5)}
.board td{padding:5px 6px;border-bottom:1.5px dashed rgba(46,36,51,.22)}
.board .t{text-align:right;white-space:nowrap}
.board td.t{font-family:var(--hand);font-weight:700}
.board tr.me td{background:rgba(143,181,122,.32)}
.board .src{margin-top:8px;font-size:12.5px;color:var(--ink2);font-style:italic}

#c{touch-action:none;-webkit-touch-callout:none}
button{touch-action:manipulation}
body.touch{-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}
body.touch input{-webkit-user-select:text;user-select:text}
.touch-only{display:none}
body.touch .touch-only{display:block}

body.touch #ov{position:fixed;inset:0;width:auto;height:auto;transform:none;z-index:20;padding:20px 18px;background:var(--grain, none),rgba(20,26,53,.96)}
body.touch .title{font-size:46px}
body.touch .title.small{font-size:38px}
body.touch #eq{display:none!important}

.pause-btn{position:absolute;top:2.5%;right:1.2%;width:6.5%;min-width:34px;aspect-ratio:1;padding:0;display:flex;align-items:center;justify-content:center;
  font:700 clamp(12px,2vw,19px) var(--body);border-radius:50%;transform:none;box-shadow:2px 2px 0 var(--ink);z-index:5}
.pause-btn:hover{transform:translate(-1px,-1px);box-shadow:3px 3px 0 var(--ink)}
.pause-btn:active{transform:translate(2px,2px);box-shadow:0 0 0 var(--ink)}
.formula{overflow-x:auto}

#rotateOv{position:fixed;inset:0;z-index:40;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:22px;padding:24px;
  background:var(--grain, none),rgba(20,26,53,.97);color:var(--cream);font-family:var(--hand);font-size:26px;text-align:center}
#rotateOv p{margin:0}
#rotateOv .phone{width:46px;height:80px;border:4px solid var(--gold);border-radius:10px;animation:turn 2s ease-in-out infinite}
@keyframes turn{0%,25%{transform:rotate(0)}55%,100%{transform:rotate(-90deg)}}
@media (prefers-reduced-motion:reduce){ #rotateOv .phone{animation:none;transform:rotate(-90deg)} }
#touch{display:none;max-width:900px;flex-wrap:wrap;justify-content:center;align-items:center;gap:10px 14px;color:#d8ccb4;font-size:14px;text-align:center}
body.touch #touch{display:flex}
body.touch #keys{display:none}
.rotate{display:none;width:100%;color:var(--gold);font-family:var(--hand);font-size:17px}
@media (orientation:portrait){ body.touch .rotate{display:block} }

@media (orientation:landscape) and (max-height:600px){
  body.touch{padding:6px;gap:8px}
  body.touch .top{display:none}
  body.touch #wrap{max-width:min(900px,calc((100vh - 12px) * 1.5));max-width:min(900px,calc((100dvh - 12px) * 1.5))}
}
#wrap:fullscreen{max-width:none;border:0;border-radius:0;display:flex;align-items:center;justify-content:center;background:var(--night)}
#wrap:fullscreen #c{width:min(100vw,150vh)}

@media (max-width:760px){
  #wrap{display:flex;flex-direction:column}
  #ov{position:relative;width:auto;height:auto;transform:none;order:-1;padding:22px 16px}
  .title{font-size:46px} .title.small{font-size:38px}
  .ov-grid{grid-template-columns:1fr}
  .levels{grid-template-columns:1fr}
  .outro-cols{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){ button{transition:none} }