/* Smushkeys SMK-29. Instrument Sheet chassis, accent #3F5FA0 (playpen blue). */
:root{
  --paper:#EDE9E2;
  --ink:#1E1D1B;
  --panel:#DEDACF;
  --line:#B7B0A2;
  --chassis:#2A2924;
  --accent:#3F5FA0;
  --on-accent:#EDE9E2;           /* paper on the blue is 5.1:1 */
  --font-ui:"Familjen Grotesk",system-ui,sans-serif;
  --font-spec:"Martian Mono",ui-monospace,monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
}
@media (prefers-color-scheme:dark){
  :root{--paper:#1E1D1B;--ink:#EDE9E2;--panel:#2A2924;--line:#4A473F;--chassis:#111}
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-ui);font-size:1rem;line-height:1.55;overflow-x:hidden}
body.is-playing{overflow:hidden}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button{font:inherit;color:inherit}
h1,h2,h3,p,dl,dd,dt,ol,ul,figure,pre,fieldset{margin:0}
fieldset{padding:0;border:0;min-width:0}
legend{padding:0}
[hidden]{display:none!important}
strong{font-weight:600}

/* label strip */
.strip{max-width:1120px;margin:0 auto;padding:18px 32px 0;display:flex;justify-content:space-between;align-items:baseline;font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;border-bottom:1px solid var(--line)}
.strip-maker{text-decoration:none;padding-bottom:12px}
.strip-maker:hover{text-decoration:underline;text-underline-offset:3px}
.strip-code{padding-bottom:12px}

/* page */
.wrap{max-width:1120px;margin:0 auto;padding:40px 32px 0}
.title{font-size:5rem;font-weight:600;line-height:1;letter-spacing:-.01em;margin-bottom:16px}
.lede{font-size:1.125rem;max-width:58ch;margin-bottom:28px}
.subhead{font-size:1.375rem;font-weight:500;line-height:1.25;margin-bottom:10px}
.section-head{font-size:2rem;font-weight:600;line-height:1.1;margin:40px 0 14px}

/* the blue slab: the one accent shape, and the hero */
.hero{position:relative;background:var(--accent);color:var(--on-accent);padding:36px 40px 36px;overflow:hidden}
.hero::before,.hero::after,.hero>.ticks::before,.hero>.ticks::after{content:"";position:absolute;width:14px;height:14px;border:0 solid #EDE9E2;pointer-events:none;z-index:2}
.hero::before{top:0;left:0;border-top-width:1px;border-left-width:1px}
.hero::after{top:0;right:0;border-top-width:1px;border-right-width:1px}
.hero>.ticks::before{bottom:0;left:0;border-bottom-width:1px;border-left-width:1px}
.hero>.ticks::after{bottom:0;right:0;border-bottom-width:1px;border-right-width:1px}
.hero-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(320px,7fr);gap:24px 48px;align-items:start}
.hero-main{min-width:0;padding-top:8px}

.result-label{font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;margin-bottom:10px;opacity:.85}
.result{display:block;font-weight:600;font-size:4.5rem;line-height:1;letter-spacing:-.02em;overflow-wrap:anywhere;min-height:1em;margin-bottom:18px}
.result-sub{max-width:40ch;font-size:1.0625rem;margin-bottom:26px;min-height:2.6em}

/* buttons */
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.btn{position:relative;display:inline-block;padding:12px 18px;border:1px solid var(--ink);background:var(--paper);color:var(--ink);font-weight:500;line-height:1.2;cursor:pointer;border-radius:0;text-decoration:none}
.btn:hover{background:var(--panel)}
.btn-primary{background:#EDE9E2;border-color:#EDE9E2;color:#1E1D1B}
.btn-primary:hover{background:#EDE9E2}
.btn-primary .ticks{position:absolute;inset:0;pointer-events:none}
.btn-primary::before,.btn-primary::after,.btn-primary .ticks::before,.btn-primary .ticks::after{content:"";position:absolute;width:14px;height:14px;border:0 solid #EDE9E2;opacity:0;pointer-events:none}
.btn-primary::before{top:-6px;left:-6px;border-top-width:1px;border-left-width:1px}
.btn-primary::after{top:-6px;right:-6px;border-top-width:1px;border-right-width:1px}
.btn-primary .ticks::before{bottom:-6px;left:-6px;border-bottom-width:1px;border-left-width:1px}
.btn-primary .ticks::after{bottom:-6px;right:-6px;border-bottom-width:1px;border-right-width:1px}
.btn-primary:hover::before,.btn-primary:hover::after,.btn-primary:hover .ticks::before,.btn-primary:hover .ticks::after,
.btn-primary:focus-visible::before,.btn-primary:focus-visible::after,.btn-primary:focus-visible .ticks::before,.btn-primary:focus-visible .ticks::after{opacity:1}
.btn-primary:focus-visible{outline-color:#EDE9E2;outline-offset:4px}
.btn-inv{background:transparent;border-color:#EDE9E2;color:#EDE9E2}
.btn-inv:hover{background:rgba(237,233,226,.12)}
.btn-inv:focus-visible{outline-color:#EDE9E2}
.hint{font-size:.9375rem;opacity:.85;margin-top:16px;max-width:44ch}

/* the small stage inside the slab */
.stage-box{min-width:0}
.preview{display:block;width:100%;aspect-ratio:16/10;background:var(--paper);border:1px solid #EDE9E2;cursor:pointer;touch-action:none;user-select:none;-webkit-user-select:none}
.preview:focus-visible{outline:2px solid #EDE9E2;outline-offset:3px}
.stage-cap{font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;margin-top:10px;opacity:.85}

/* reading line */
.reading{font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;white-space:pre;margin:12px 0 0}

/* parent's controls */
.panel{position:relative;border:1px solid var(--line);background:var(--panel);padding:24px 32px 28px}
.controls{margin-top:24px}
.controls-note{margin-bottom:20px;max-width:60ch}
.opts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px 32px}
.field{min-width:0}
.field legend{display:block;font-weight:500;margin-bottom:10px}
.checks,.seps{display:flex;flex-direction:column;gap:8px}
.field .check{display:flex;align-items:flex-start;gap:10px;margin:0;font-weight:400;cursor:pointer;line-height:1.35}
.check input{width:18px;height:18px;margin:2px 0 0;flex:0 0 auto;accent-color:var(--accent);cursor:pointer}
.check input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.opt-note{font-size:.9375rem;margin-top:10px;opacity:.85}

/* what each key does */
.keys-note{margin-bottom:16px;max-width:60ch}
.key-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}
.key-cell{display:flex;flex-direction:column;gap:8px;padding:20px 22px 22px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.key-cell .subhead{margin-bottom:0}
.key-cell p{max-width:40ch}
.key-cell p:nth-of-type(1){flex:1}
.key-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.kbd{font-family:var(--font-spec);font-size:.8125rem;font-weight:500;min-width:44px;padding:8px 12px;border:1px solid var(--ink);border-bottom-width:3px;background:var(--paper);cursor:pointer;border-radius:2px;line-height:1}
.kbd:hover{background:var(--panel)}
.kbd:active{border-bottom-width:1px;transform:translateY(2px)}
.kbd-wide{min-width:140px}

/* notes and faq */
.notes{display:grid;grid-template-columns:repeat(12,minmax(0,1fr))}
.notes>*{grid-column:span 8}
.notes p{max-width:68ch;margin-bottom:14px}
.faq-list{max-width:68ch;border-top:1px solid var(--line)}
.faq-list dt{font-weight:500;font-size:1.125rem;padding:14px 0 4px}
.faq-list dd{padding:0 0 14px;border-bottom:1px solid var(--line)}

.foot{max-width:1120px;margin:0 auto;padding:20px 32px 40px;font-size:.875rem;opacity:.8}
.foot p{max-width:70ch}

/* the big stage */
#play{position:fixed;inset:0;z-index:1000;background:var(--paper);touch-action:none;user-select:none;-webkit-user-select:none;cursor:default}
#play:fullscreen{background:var(--paper)}
#stage{display:block;width:100%;height:100%}
.done{position:absolute;top:12px;right:12px;font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;padding:8px 12px;border:1px solid var(--ink);background:var(--paper);color:var(--ink);cursor:pointer;opacity:.55;border-radius:0}
.done:hover,.done:focus-visible{opacity:1}
.play-hint{position:absolute;left:0;right:0;bottom:24px;text-align:center;font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;color:var(--ink);opacity:.7;pointer-events:none;padding:0 16px}

/* phones and narrow screens */
@media (max-width:900px){
  .notes>*{grid-column:span 12}
  .opts{grid-template-columns:1fr}
  .key-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero-grid{grid-template-columns:1fr;gap:22px}
  .result{font-size:3.5rem}
}
@media (max-width:640px){
  .strip{padding:14px 16px 0}
  .wrap{padding:28px 16px 0}
  .title{font-size:3rem}
  .lede{font-size:1rem}
  .hero{padding:22px 18px 24px}
  .hero-main{padding-top:0}
  .result{font-size:2.5rem;margin-bottom:12px}
  .result-sub{font-size:1rem;margin-bottom:18px;min-height:0}
  .hint{margin-top:12px}
  .preview{aspect-ratio:4/3}
  .panel{padding:20px 16px 22px}
  .key-grid{grid-template-columns:1fr}
  .section-head{font-size:1.625rem}
  .foot{padding:16px 16px 32px}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}