:root{--amber:#f2a01f;--amber-hi:#ffb747;--amber-dim:#b9791a;--screen:#000}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  background:#000;
  display:grid;place-items:center;overflow:hidden;
  font-family:'IBM Plex Mono',Menlo,Consolas,Monaco,'Courier New',monospace;
  color:var(--amber);
}
a{color:var(--amber)}
.framewrap{width:min(100vw,calc(100svh*1.3333),1500px);aspect-ratio:4/3;position:relative}
.screen{position:absolute;inset:0;overflow:hidden;
  background:radial-gradient(ellipse at 50% 46%,rgba(242,160,31,.035) 0%,rgba(242,160,31,.012) 42%,transparent 75%),var(--screen)}
.screen::before{content:'';position:absolute;inset:0;pointer-events:none;opacity:.16;
  background:repeating-linear-gradient(to bottom,rgba(255,255,255,.03) 0 1px,transparent 2px 4px)}
.screen::after{content:'';position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse at center,transparent 66%,rgba(0,0,0,.28) 100%)}
.frame{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none;z-index:4;
  -webkit-mask-image:linear-gradient(to right,transparent,#000 5%,#000 95%,transparent),linear-gradient(to bottom,transparent,#000 5%,#000 95%,transparent);
  -webkit-mask-composite:source-in;
  mask-image:linear-gradient(to right,transparent,#000 5%,#000 95%,transparent),linear-gradient(to bottom,transparent,#000 5%,#000 95%,transparent);
  mask-composite:intersect}
.content{position:absolute;inset:7% 8% 8% 8%;z-index:3;display:flex;flex-direction:column;align-items:center;text-align:center;min-height:0}
.title{display:block;width:min(760px,66%);margin-top:4%}
.title img{display:block;width:100%}
.tagline{margin:3.1% 0 0;font-size:clamp(13px,1.45vw,21px);font-weight:400;letter-spacing:.025em;line-height:1.45;color:var(--amber-dim);text-shadow:0 0 12px rgba(242,160,31,.14)}
.cassette{margin-top:5.5%;width:min(670px,56%);filter:drop-shadow(0 0 10px rgba(242,160,31,.14))}
.cassette img{display:block;width:100%}
nav{margin-top:auto;margin-bottom:6.5%;display:flex;gap:clamp(9px,1.5vw,22px);align-items:center;justify-content:center}
nav a{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  min-height:clamp(36px,3.7vw,46px);padding:0 clamp(12px,1.5vw,20px);
  color:var(--amber);text-decoration:none;font-size:clamp(12px,1.4vw,19px);font-weight:500;letter-spacing:.04em;line-height:1.2;
  text-shadow:0 0 6px rgba(242,160,31,.18);transition:background-color .15s,color .15s,box-shadow .15s}
nav a::before{content:"";position:absolute;inset:0;pointer-events:none;opacity:1;
  background:
   repeating-linear-gradient(90deg,currentColor 0 5px,transparent 5px 10px) top left/100% 1px no-repeat,
   repeating-linear-gradient(90deg,currentColor 0 5px,transparent 5px 10px) bottom left/100% 1px no-repeat,
   repeating-linear-gradient(0deg,currentColor 0 5px,transparent 5px 10px) top left/1px 100% no-repeat,
   repeating-linear-gradient(0deg,currentColor 0 5px,transparent 5px 10px) top right/1px 100% no-repeat}
nav a:hover,nav a:focus-visible{
  background:rgba(242,160,31,.065);color:var(--amber-hi);
  text-shadow:0 0 7px rgba(255,183,71,.32);
  box-shadow:0 0 9px rgba(242,160,31,.14);
}
nav a[aria-current=page]{color:var(--amber-hi);background:rgba(242,160,31,.035)}
nav a:focus-visible{outline:2px solid var(--amber-hi);outline-offset:4px;
  box-shadow:0 0 0 3px #000,0 0 0 5px var(--amber-hi)}
.sym{flex:none;display:inline-block}
.stop{width:.55em;height:.55em;background:currentColor}
.play{width:0;height:0;border:.33em solid transparent;border-left:.56em solid currentColor;border-right:0}
.rec{width:.62em;height:.62em;border-radius:50%;background:currentColor}
/* interior pages */
.sub .title{width:min(360px,34%);margin-top:1%}
.page{flex:1;min-height:0;width:min(740px,100%);margin:4% 0 3%;overflow-y:auto;text-align:left;font-size:clamp(15px,1.55vw,21px);line-height:1.65;padding-right:1em;scrollbar-width:thin;scrollbar-color:var(--amber-dim) transparent}
.page h1{font-weight:500;font-size:clamp(24px,2.5vw,36px);margin:0 0 .5em}
.page h2{font-weight:500;font-size:1.12em;margin:1.2em 0 .2em;color:var(--amber-hi)}
.page p{margin:.3em 0 .8em}
.page .note{color:var(--amber-dim)}
.page .opts{display:grid;grid-template-columns:1fr 1fr;gap:1em}
.page .opt{border:1px dashed var(--amber-dim);padding:.7em .9em}
.page .opt h2{margin-top:0}
.sub nav{margin-bottom:0;margin-top:0}
/* phone portrait: no CRT, the screen is the cassette */
@media (max-width:700px) and (orientation:portrait){
  body{display:block;overflow:auto;background:#000}
  .framewrap{width:100%;height:100dvh;aspect-ratio:auto}
  .screen::after{background:radial-gradient(ellipse at center,transparent 65%,rgba(0,0,0,.22) 100%)}
  .frame{display:none}
  .content{inset:0;padding:max(18px,env(safe-area-inset-top)) 18px max(20px,env(safe-area-inset-bottom))}
  .title{width:min(300px,78%);margin-top:2dvh}
  .tagline{margin-top:1.4dvh;font-size:clamp(12px,3.15vw,15px);line-height:1.4;max-width:94%}
  .cassette{margin:2dvh 0;flex:1;min-height:0;width:100%;position:relative}
  .cassette img{position:absolute;inset:0;margin:auto;width:auto;height:100%;max-width:92%;object-fit:contain}
  nav{margin:auto 0 0;width:100%;gap:8px}
  nav a{flex:1;min-height:46px;padding:0 5px;font-size:clamp(11px,3.2vw,14px);letter-spacing:.015em}
  .sub{height:auto;min-height:100dvh}
  .sub .framewrap{height:auto;min-height:100dvh}
  .sub .content{position:relative;min-height:100dvh}
  .sub .title{width:200px}
  .page{overflow:visible;font-size:clamp(14px,3.7vw,17px);line-height:1.65;margin:5% 0 6%;padding:0}
  .page .opts{grid-template-columns:1fr}
  .sub nav{position:sticky;bottom:0;background:#000;padding:10px 0 2px}
}
@media (prefers-reduced-motion:reduce){nav a{transition:none}}

/* Compact phones: preserve safe areas and keep transport controls usable. */
@media (max-width:700px) and (orientation:portrait){
  .framewrap{min-height:100svh;height:100dvh}
  .content{padding-top:max(18px,env(safe-area-inset-top));
           padding-bottom:max(18px,env(safe-area-inset-bottom));}
  .cassette{margin:1.5dvh 0}
  .cassette img{max-width:100%;max-height:100%}
  nav{flex-shrink:0}
  .sub .framewrap{height:auto;min-height:100svh}
}
@media (max-width:380px) and (orientation:portrait){
  .content{padding-left:12px;padding-right:12px}
  .title{width:min(265px,74%);margin-top:1dvh}
  .tagline{font-size:12px}
  nav{gap:5px}
  nav a{min-height:44px;padding:0 3px;font-size:11px;gap:.35em}
}
@media (max-height:670px) and (max-width:700px) and (orientation:portrait){
  .title{width:min(235px,65%);margin-top:0}
  .tagline{margin-top:6px}
  .cassette{margin:6px 0}
  nav a{min-height:42px}
}