/* UTM builder UTM-36. Instrument Sheet chassis, accent #8A3E2E (rust). */
:root{
  --paper:#EDE9E2;
  --ink:#1E1D1B;
  --panel:#DEDACF;
  --line:#B7B0A2;
  --chassis:#2A2924;
  --accent:#8A3E2E;
  --on-accent:#EDE9E2;          /* paper on rust is 6.0:1, so type on the slab is paper */
  --on-accent-fill:#1E1D1B;     /* the inverted primary button inside the slab */
  --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;--on-accent-fill:#1E1D1B}
}

*{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,dt,ol,ul,figure,pre,fieldset{margin:0}
fieldset{padding:0;border:0;min-width:0}
legend{padding:0}
[hidden]{display:none!important}
code{font-family:var(--font-spec);font-size:.8em}
s{text-decoration-thickness:1px}

/* 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: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 rust slab: the one accent shape, and the hero */
.hero{position:relative;background:var(--accent);color:var(--on-accent);padding:36px 40px 32px;overflow:hidden}
.hero::before,.hero::after,.hero>.ticks::before,.hero>.ticks::after{content:"";position:absolute;width:14px;height:14px;border:0 solid var(--paper);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}
@media (prefers-color-scheme:dark){
  .hero::before,.hero::after,.hero>.ticks::before,.hero>.ticks::after{border-color:#EDE9E2}
}

/* the ampersand, drawn in type; stamps when a parameter joins the URL */
.amp{position:absolute;right:28px;top:2px;font-size:9rem;font-weight:600;line-height:1;color:var(--on-accent);opacity:.28;user-select:none;pointer-events:none;transform-origin:50% 60%}
.amp.is-stamp{animation:stamp .32s var(--ease)}
@keyframes stamp{0%{transform:scale(1.22);opacity:.6}100%{transform:none;opacity:.28}}

/* the URL, enormous; machine output so the spec face is allowed */
.url{display:block;position:relative;font-family:var(--font-spec);font-weight:500;font-size:2.25rem;line-height:1.25;letter-spacing:0;word-break:normal;overflow-wrap:anywhere;min-height:2.5em;margin:0 0 22px;max-width:calc(100% - 140px);-webkit-user-select:all;user-select:all}
.url.is-empty{font-family:var(--font-ui);font-weight:500;font-size:1.75rem;line-height:1.3;letter-spacing:-.005em;word-break:normal;max-width:24ch;-webkit-user-select:text;user-select:text}
.url .c{display:inline}
.url .c.is-off{visibility:hidden}
.url .c.is-tail::after{content:"";display:inline-block;width:.6em;height:1em;background:var(--on-accent);vertical-align:-.15em;margin-left:.06em}
.url .sym{opacity:.55}
.url .key{opacity:.78}
.url .frag{opacity:.78}

/* the ledger: each parameter on its own line */
.ledger{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 22px;margin:0 0 22px;max-width:60ch;align-items:baseline}
.ledger dt{font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;padding-top:.35em}
.ledger dd{font-size:1.125rem;line-height:1.3;min-width:0;overflow-wrap:anywhere}
.ledger .raw{display:block;font-size:.9375rem;opacity:.75;line-height:1.2}
.ledger .raw.is-gone{display:none}
.ledger .note{display:block;font-family:var(--font-spec);font-size:.6875rem;letter-spacing:.02em;opacity:.8;margin-top:2px}
.verdict{font-size:1.125rem;font-weight:500;margin:0 0 22px;max-width:60ch}
.verdict b{font-weight:600}

/* 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:disabled{opacity:.45;cursor:default}
.btn.is-done{background:var(--ink);color:var(--paper)}
.btn-small{padding:7px 12px;font-size:.9375rem}
/* inside the rust everything inverts: the primary is paper-filled, the secondary is paper-outlined */
.btn-primary{background:var(--on-accent);border-color:var(--on-accent);color:var(--on-accent-fill)}
.btn-primary:hover{background:var(--on-accent)}
.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}
.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}
.btn-primary.is-done{background:var(--on-accent-fill);color:var(--on-accent);border-color:var(--on-accent-fill)}
.btn-inv{background:transparent;border-color:var(--on-accent);color:var(--on-accent)}
.btn-inv:hover{background:rgba(237,233,226,.12)}
.btn-inv:focus-visible{outline-color:var(--on-accent)}
.btn-inv.is-done{background:var(--on-accent);color:var(--on-accent-fill)}

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

/* the instrument panel: builder on the left, convention on the right */
.panel{position:relative;border:1px solid var(--line);background:var(--panel);margin-top:24px;display:grid;grid-template-columns:7fr 5fr}
.bay{padding:24px 32px 28px;min-width:0}
.bay+.bay{border-left:1px solid var(--line)}
.bay-head{font-size:1.375rem;font-weight:500;line-height:1.25;margin-bottom:4px}
.bay-note{font-size:.9375rem;margin-bottom:20px;max-width:52ch}
.field{margin-bottom:20px;min-width:0}
.field>label,.field legend,.field .lbl{display:block;font-weight:500;margin-bottom:8px}
.field .opt{font-weight:400;opacity:.7}
.in{width:100%;font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line);padding:11px 12px;border-radius:0;line-height:1.3}
.in:focus{outline:2px solid var(--accent);outline-offset:0;border-color:var(--accent)}
.in-mono{font-family:var(--font-spec);font-size:.875rem;font-weight:500}
.in-num{width:7em}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.chip{padding:5px 10px;border:1px solid var(--line);background:var(--paper);color:var(--ink);font-size:.9375rem;line-height:1.2;cursor:pointer;border-radius:0}
.chip:hover{border-color:var(--ink)}
.chip.is-on{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.chip:active{transform:translateY(1px)}
.found{border:1px solid var(--line);background:var(--paper);padding:10px 12px;font-size:.9375rem;margin-top:8px;display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center}
.found code{font-size:.75rem}
.more{margin-top:4px}
.more summary{cursor:pointer;font-weight:500;list-style:none;display:inline-flex;align-items:center;gap:8px;padding:2px 0}
.more summary::-webkit-details-marker{display:none}
.more summary::before{content:"";width:8px;height:8px;border:solid var(--ink);border-width:0 1.5px 1.5px 0;transform:rotate(-45deg);transition:transform .15s var(--ease);margin-left:2px}
.more[open] summary::before{transform:rotate(45deg)}
.more .field{margin-top:16px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* the convention bay */
.rules{display:flex;flex-direction:column;gap:18px}
.seg-row{display:inline-flex;border:1px solid var(--ink);flex-wrap:wrap}
.seg-row label{position:relative}
.seg-row input{position:absolute;opacity:0;width:1px;height:1px;margin:0}
.seg-row span{display:block;padding:8px 14px;background:var(--paper);color:var(--ink);font-weight:500;cursor:pointer;line-height:1.2}
.seg-row label+label span{border-left:1px solid var(--ink)}
.seg-row input:checked+span{background:var(--ink);color:var(--paper)}
.seg-row input:focus-visible+span{outline:2px solid var(--accent);outline-offset:-3px}
.check{display:flex;align-items:center;gap:10px;margin:0;font-weight:400;cursor:pointer;line-height:1.3}
.check input{width:18px;height:18px;margin:0;flex:0 0 auto;accent-color:var(--accent);cursor:pointer}
.allowed{font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;border:1px solid var(--line);background:var(--paper);padding:9px 12px;white-space:pre-wrap}
.pattern-ex{font-size:.9375rem;margin-top:8px}
.pattern-ex code{font-size:.8125rem}
.tokens{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.tokvals{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}
.tokvals label{display:block;font-size:.9375rem;font-weight:500;margin-bottom:4px}
.tokvals .in{padding:8px 10px}

/* lint */
.lint{margin-top:28px;max-width:72ch}
.lint ul{list-style:none;padding:0;border-top:1px solid var(--line)}
.lint li{display:grid;grid-template-columns:14px minmax(0,1fr);gap:14px;padding:10px 0;border-bottom:1px solid var(--line);align-items:start}
.lint li::before{content:"";width:14px;height:14px;margin-top:.35em;background:var(--accent)}
.lint li.ok::before{background:transparent;border:1px solid var(--line)}
.lint-empty{padding:10px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:.9375rem}

/* links this session */
.session{margin-top:40px}
.session-note{font-size:.9375rem;margin-bottom:12px;max-width:60ch}
.session-actions{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:12px}
.tbl-wrap{overflow-x:auto;border-top:1px solid var(--line)}
.tbl{width:100%;border-collapse:collapse;font-size:.9375rem}
.tbl th,.tbl td{text-align:left;padding:8px 12px 8px 0;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{font-weight:500;white-space:nowrap}
.tbl td.u{font-family:var(--font-spec);font-size:.75rem;font-weight:500;max-width:36ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tbl td:last-child,.tbl th:last-child{padding-right:0;text-align:right}
.tbl-empty{padding:10px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:.9375rem}

/* 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}
.chan{width:100%;border-collapse:collapse;font-size:.9375rem;margin-bottom:14px}
.chan th,.chan td{text-align:left;padding:7px 14px 7px 0;border-bottom:1px solid var(--line);vertical-align:top}
.chan th{font-weight:500}
.chan td:first-child{white-space:nowrap;font-weight:500}
.chan code{font-size:.75rem;white-space:nowrap}

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

/* phones and narrow screens */
@media (max-width:900px){
  .notes>*{grid-column:span 12}
  .panel{grid-template-columns:1fr}
  .bay+.bay{border-left:0;border-top:1px solid var(--line)}
  .url{font-size:1.75rem;max-width:calc(100% - 90px)}
  .amp{font-size:6.5rem;right:18px}
}
@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:22px 18px 22px}
  .amp{display:none}
  .url{font-size:1.125rem;max-width:100%;margin-bottom:16px;min-height:3em}
  .url.is-empty{font-size:1.25rem}
  .ledger{grid-template-columns:1fr;gap:8px 0}
  .ledger dt{padding-top:0}
  .ledger dd{font-size:1rem;margin-bottom:4px}
  .verdict{font-size:1rem}
  .bay{padding:20px 16px 22px}
  .row2,.tokvals{grid-template-columns:1fr}
  .section-head{font-size:1.625rem}
  .chan{font-size:.875rem}
  .chan td:first-child{white-space:normal}
  .foot{padding:16px 16px 32px}
}

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