/* robots.txt builder RBT-12. Instrument Sheet chassis, accent #4E6A8A (denim). */
:root{
  --paper:#EDE9E2;
  --ink:#1E1D1B;
  --panel:#DEDACF;
  --line:#B7B0A2;
  --chassis:#2A2924;
  --accent:#4E6A8A;
  --on-accent:#EDE9E2;      /* paper on denim, 4.6:1: headline, labels and the printed file */
  --slab-paper:#EDE9E2;     /* the gate cards keep their paper in both schemes */
  --slab-panel:#DEDACF;
  --slab-ink:#1E1D1B;
  --slab-line:#B7B0A2;
  --hair:rgba(237,233,226,.34);
  --flash:rgba(237,233,226,.28);
  --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}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button{font:inherit;color:inherit}
h1,h2,h3,p,dl,dd,ol,ul,figure,pre,fieldset,blockquote{margin:0}
ol,ul{padding:0;list-style:none}
fieldset{padding:0;border:0;min-width:0}
[hidden]{display:none!important}
code{font-family:var(--font-spec);font-size:.8em}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* 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:4.5rem;font-weight:600;line-height:1;letter-spacing:-.01em;margin-bottom:16px}
.lede{font-size:1.125rem;max-width:60ch;margin-bottom:28px}
.lede strong{font-weight:600}
.subhead{font-size:1.375rem;font-weight:500;line-height:1.25}
.section-head{font-size:2rem;font-weight:600;line-height:1.1;margin:40px 0 14px}

/* the denim slab: the one accent shape. Verdict, presets, paper cards and the printed sheet all sit on it */
.hero{position:relative;background:var(--accent);color:var(--on-accent);padding:28px 40px 40px;overflow:clip}
.hero::before,.hero::after,.hero>.ticks::before,.hero>.ticks::after{content:"";position:absolute;width:14px;height:14px;border:0 solid var(--on-accent);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}

.slab-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px 32px;margin-bottom:22px}
.verdict-box{min-width:0;flex:1 1 480px}
.big{font-size:clamp(2.75rem,6vw,5rem);font-weight:600;line-height:.95;letter-spacing:-.03em;overflow-wrap:anywhere;min-height:1em}
.big.is-tick{animation:tick .26s var(--ease) both}
@keyframes tick{0%{transform:translateY(.28em);opacity:.4}100%{transform:none;opacity:1}}
.verdict{font-size:1.375rem;font-weight:500;line-height:1.3;max-width:52ch;margin-top:10px;min-height:1.3em}

/* tabs: two flat buttons, the on one is paper */
.tabs{display:flex;flex:0 0 auto;padding-bottom:6px}
.tab{padding:11px 18px;border:1px solid var(--on-accent);background:transparent;color:var(--on-accent);font-weight:600;font-size:1.0625rem;line-height:1.2;cursor:pointer;border-radius:0;margin-left:-1px}
.tab:first-child{margin-left:0}
.tab.is-on{background:var(--slab-paper);color:var(--slab-ink);border-color:var(--slab-paper)}
.tab:hover:not(.is-on){background:rgba(237,233,226,.14)}
.tab:focus-visible{outline-color:var(--on-accent);outline-offset:3px;position:relative;z-index:1}

/* presets */
.presets{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:22px}
.presets-label{font-size:1.0625rem;font-weight:500;margin-right:6px}
.preset{padding:9px 13px;border:1px solid var(--on-accent);background:transparent;color:var(--on-accent);font-weight:500;font-size:.9375rem;line-height:1.2;cursor:pointer;border-radius:0}
.preset:hover{background:rgba(237,233,226,.14)}
.preset.is-on{background:var(--slab-paper);color:var(--slab-ink);border-color:var(--slab-paper)}
.preset:focus-visible{outline-color:var(--on-accent);outline-offset:3px}

/* the bench: printed sheet on the left (7 of 12), the paper gate cards on the right (5 of 12) */
.bench{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px 28px;align-items:start}
.sheet-col{grid-column:span 7;min-width:0;position:sticky;top:16px}
.form{grid-column:span 5;min-width:0;display:grid;gap:16px}

/* the sheet: a hairline paper frame on the denim, the file printed in paper */
.sheet{border:1px solid var(--hair);min-width:0}
.sheet-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 14px;padding:12px 14px 12px 18px;border-bottom:1px solid var(--hair)}
.sheet-label{font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;white-space:pre}
.sheet-tools{display:flex;flex-wrap:wrap;gap:8px}
.print{padding:18px 18px 22px;min-height:420px;font-family:var(--font-spec);font-size:.8125rem;line-height:1.7;letter-spacing:0;overflow-x:auto;overflow-wrap:anywhere;white-space:pre-wrap;color:var(--on-accent);cursor:text}
.print:focus-visible{outline:2px solid var(--on-accent);outline-offset:-4px}
.ln{position:relative;min-height:1.7em;padding:0 4px;margin:0 -4px}
.ln.is-comment{opacity:.7}
.ln.is-typing::after{content:"";display:inline-block;width:.6em;height:1.05em;vertical-align:-.15em;margin-left:1px;background:var(--on-accent);animation:blink .9s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.ln.is-flash{animation:flash .9s var(--ease) both}
@keyframes flash{0%{background:var(--flash)}100%{background:transparent}}
.print-empty{opacity:.75;font-family:var(--font-ui);font-size:1rem;white-space:normal}

/* check mode: each line gets a number, the raw line and a plain reading */
.print-check{padding:0;min-height:320px;white-space:normal;font-family:var(--font-ui);font-size:1rem;line-height:1.45}
.check-empty{padding:18px;opacity:.8}
.row-check{display:grid;grid-template-columns:3ch minmax(0,1fr);gap:4px 14px;padding:10px 18px 12px 14px;border-bottom:1px solid var(--hair)}
.row-check:last-child{border-bottom:0}
.row-check.is-warn{box-shadow:inset 4px 0 0 var(--slab-paper)}
.row-check .n{font-family:var(--font-spec);font-size:.75rem;font-weight:500;padding-top:.2em;opacity:.75;text-align:right}
.row-check .raw{font-family:var(--font-spec);font-size:.8125rem;line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere;grid-column:2}
.row-check .say{grid-column:2;font-size:.9375rem;max-width:62ch}
.row-check .say strong{font-weight:600}
.row-check.is-blank .raw{opacity:.5}
.check-sum{padding:14px 18px;border-bottom:1px solid var(--hair);font-size:1.0625rem;font-weight:500}

/* gate cards: paper, on the denim */
.cards{display:grid;gap:16px}
.card{background:var(--slab-paper);color:var(--slab-ink);padding:18px 20px 20px;min-width:0}
.card.is-landing{animation:land .32s var(--ease) both}
@keyframes land{0%{transform:translateY(-14px);opacity:0}100%{transform:none;opacity:1}}
.card-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:4px}
.card-title{font-size:1.25rem;font-weight:600;line-height:1.2}
.card-title .for{border-bottom:3px solid var(--accent)}
.explain{font-size:.9rem;line-height:1.5;margin:6px 0 12px;max-width:60ch}
.explain.is-quiet{opacity:.85}
.explain.is-warn{opacity:1;border-left:4px solid var(--accent);padding-left:10px}
.explain code{font-size:.78em}
.who{font-size:.9375rem;line-height:1.45;margin:10px 0 4px;max-width:56ch;white-space:pre-wrap}
.who strong{font-weight:600;white-space:nowrap}
.subrule{font-size:.9375rem;font-weight:500;margin:12px 0 6px}
.rows{display:grid;gap:8px}
.row{display:flex;gap:6px;align-items:stretch;min-width:0}
.row>.field{flex:1 1 auto;min-width:0}
.field{font:inherit;font-size:.9375rem;line-height:1.3;padding:8px 10px;border:1px solid var(--slab-line);background:var(--slab-paper);color:var(--slab-ink);border-radius:0;color-scheme:light;width:100%;min-width:0}
.field:focus{outline:2px solid var(--accent);outline-offset:-1px}
.field-mono{font-family:var(--font-spec);font-size:.8125rem;line-height:1.5}
select.field{appearance:none;-webkit-appearance:none;padding-right:30px;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' fill='none' stroke='%231E1D1B' stroke-width='1.5'/></svg>");background-repeat:no-repeat;background-position:right 10px center;cursor:pointer}
.kind{flex:0 0 auto;width:9.6em}
.field-comment,.field-check{resize:vertical;font-family:var(--font-spec);font-size:.8125rem;line-height:1.5}
.field-check{min-height:300px}
.field-delay{width:6em;flex:0 0 auto}
.delay-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.delay-row .unit{font-size:.9375rem}
.tool{padding:8px 11px;border:1px solid var(--slab-ink);background:var(--slab-paper);color:var(--slab-ink);font-weight:500;font-size:.9375rem;line-height:1.2;cursor:pointer;border-radius:0;white-space:nowrap}
.tool:hover:not(:disabled){background:var(--slab-panel)}
.tool:disabled{opacity:.4;cursor:default}
.tool:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.tool.is-done{background:var(--slab-ink);color:var(--slab-paper)}
.tool-x{flex:0 0 auto;width:38px;padding:0;font-size:1.125rem;line-height:1}
.tool-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.card-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;align-items:center}
.card-remove{white-space:nowrap;font-size:.9375rem;font-weight:500;background:transparent;border:0;padding:0;text-decoration:underline;text-underline-offset:3px;cursor:pointer;color:inherit}
.btn-add-group{justify-self:start}

/* buttons */
.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;text-align:center}
.btn:hover:not(:disabled){background:var(--panel)}
.btn:disabled{opacity:.45;cursor:default}
.btn-primary{background:var(--slab-ink);border-color:var(--slab-ink);color:var(--slab-paper);padding-left:20px;padding-right:20px;font-weight:600}
.btn-primary:hover:not(:disabled){background:var(--slab-ink)}
.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 var(--on-accent);opacity:0;pointer-events:none}
.card .btn-primary::before,.card .btn-primary::after,.card .btn-primary .ticks::before,.card .btn-primary .ticks::after{border-color:var(--slab-ink)}
.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:var(--on-accent);outline-offset:4px}
.card .btn-primary:focus-visible{outline-color:var(--accent)}
.btn-primary.is-done{background:var(--slab-paper);color:var(--slab-ink);border-color:var(--slab-paper)}
.btn-ghost{background:transparent;border-color:var(--on-accent);color:var(--on-accent);font-weight:500}
.btn-ghost:hover:not(:disabled){background:rgba(237,233,226,.14)}
.btn-ghost:focus-visible{outline-color:var(--on-accent);outline-offset:4px}
.btn-ghost.is-done{background:var(--slab-paper);color:var(--slab-ink);border-color:var(--slab-paper)}

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

/* under the slab: notes on the left, the reference panel on the right */
.under{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px 32px;margin-top:32px;align-items:start}
.left{grid-column:span 7;min-width:0}
.controls{grid-column:span 5;min-width:0}
.tabnotes{margin-bottom:24px}
.tabnotes p{max-width:64ch;margin-top:8px}
.panel{position:relative;border:1px solid var(--line);background:var(--panel);padding:24px 28px 28px;display:grid;gap:24px}
.field-set{min-width:0}
.field-set legend{font-size:1rem;font-weight:500;margin-bottom:8px;padding:0}
.field-note{font-size:.9375rem;margin-top:6px;opacity:.9}
.panel-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.keys div{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--line);font-size:.9375rem}
.keys div:last-child{border-bottom:0}
.keys dd{text-align:right}

/* notes */
.notes{display:grid;grid-template-columns:repeat(12,minmax(0,1fr))}
.notes>*{grid-column:span 8}
.notes p{max-width:68ch;margin-bottom:14px}
.notes table{grid-column:span 12;width:100%;border-collapse:collapse;margin:4px 0 16px;font-size:.9375rem}
.crawlers th{text-align:left;font-weight:500;padding:8px 12px 8px 0;border-bottom:1px solid var(--ink);vertical-align:bottom}
.crawlers td{padding:9px 12px 9px 0;border-bottom:1px solid var(--line);vertical-align:top}
.crawlers td:first-child{font-family:var(--font-spec);font-size:.75rem;font-weight:500;white-space:nowrap;padding-top:12px}
.crawlers td:nth-child(2){max-width:44ch}
.crawlers td:nth-child(3){max-width:40ch}

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

/* narrow screens */
@media (max-width:960px){
  .bench{grid-template-columns:1fr}
  .sheet-col,.form{grid-column:span 1;position:static}
  .notes>*{grid-column:span 12}
  .under{grid-template-columns:1fr}
  .left,.controls{grid-column:span 1}
  .controls{order:2}
  .print{min-height:0}
}
@media (max-width:640px){
  .strip{padding:14px 16px 0}
  .wrap{padding:28px 16px 0}
  .title{font-size:2.75rem}
  .lede{font-size:1rem}
  .hero{padding:18px 16px 22px}
  .slab-head{margin-bottom:18px}
  .verdict{font-size:1.125rem}
  .tabs{width:100%}
  .tab{flex:1 1 50%}
  .presets{gap:6px}
  .preset{font-size:.875rem;padding:8px 10px}
  .sheet-head{padding:10px 12px}
  .sheet-tools{width:100%}
  .sheet-tools .btn{flex:1 1 40%}
  .print{padding:14px 12px 18px;font-size:.75rem}
  .card{padding:16px 14px 18px}
  .row-check{padding:10px 12px 12px 10px}
  .panel{padding:20px 16px 22px;gap:20px}
  .keys div{flex-direction:column;gap:2px}
  .keys dd{text-align:left}
  .section-head{font-size:1.625rem}
  .crawlers thead{display:none}
  .crawlers tr{display:block;padding:8px 0;border-bottom:1px solid var(--line)}
  .crawlers td{display:block;border:0;padding:2px 0}
  .crawlers td:first-child{padding-top:4px}
  .foot{padding:16px 16px 32px}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  .ln.is-typing::after{display:none}
}