/* Open Q Language — a technical specification site.
   One sans for prose, one mono for everything that is q. Narrow measure,
   sidebar contents, quiet chrome. */
:root{
  --ink:#1b1f24;--dim:#5c6670;--faint:#8b949e;--rule:#e3e6ea;--bg:#fff;
  --accent:#0b5fa5;--code-bg:#f6f7f9;--code-rule:#e3e6ea;--tag:#eef3f8;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}
@media (prefers-color-scheme:dark){
  :root{--ink:#e6e9ee;--dim:#a0a9b4;--faint:#6f7883;--rule:#2a2f37;--bg:#111417;
        --accent:#79b8f3;--code-bg:#181c21;--code-rule:#262b32;--tag:#1c2530}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.65 var(--sans);color:var(--ink);background:var(--bg);
     font-feature-settings:"kern","liga"}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* ---- chrome ---- */
header{max-width:72rem;margin:0 auto;padding:1.1rem 1.5rem;display:flex;gap:1.5rem;
       align-items:baseline;justify-content:space-between;border-bottom:1px solid var(--rule)}
.brand{font-weight:650;color:var(--ink);letter-spacing:-.01em}
.brand:hover{text-decoration:none}
nav a{margin-left:1.4rem;color:var(--dim);font-size:.94rem}
nav a.on{color:var(--ink);font-weight:600}
main{max-width:72rem;margin:0 auto;padding:2rem 1.5rem 4rem}
footer{max-width:72rem;margin:0 auto;padding:1.25rem 1.5rem 2rem;border-top:1px solid var(--rule)}
footer p{color:var(--faint);font-size:.82rem;margin:0;max-width:44rem}

/* ---- document layout: sticky contents rail + measured article ---- */
.doc{display:grid;grid-template-columns:minmax(0,1fr);gap:0 3rem}
@media (min-width:64rem){
  .doc{grid-template-columns:15rem minmax(0,46rem)}
  .toc{position:sticky;top:1rem;max-height:calc(100vh - 2rem);overflow:auto;
       align-self:start;padding-right:.5rem}
}
article{min-width:0}
.toc{display:flex;flex-direction:column;font-size:.83rem;line-height:1.45;margin:0 0 2rem}
.toc-title{font-size:.72rem;font-weight:650;letter-spacing:.06em;text-transform:uppercase;
           color:var(--faint);margin:0 0 .5rem}
.toc a{color:var(--dim);padding:.14rem 0 .14rem .75rem;border-left:2px solid transparent}
.toc a:hover{color:var(--ink);text-decoration:none}
.toc a.l2{font-weight:600;color:var(--ink);margin-top:.55rem;padding-left:0}
.toc a.l2:first-of-type{margin-top:0}
.toc a.l3{border-left-color:var(--rule)}
@media (max-width:63.99rem){
  .toc{max-height:38vh;overflow:auto;padding:.9rem 1rem;border:1px solid var(--rule);
       border-radius:6px}
}

/* ---- type scale ---- */
h1{font-size:2.05rem;line-height:1.2;letter-spacing:-.022em;font-weight:700;margin:0 0 .5rem}
.lede{font-size:1.12rem;line-height:1.5;color:var(--dim);margin:0 0 1.75rem}
h2,h3{display:flex;align-items:baseline;gap:.75rem;scroll-margin-top:1rem}
h2{font-size:1.4rem;line-height:1.3;letter-spacing:-.015em;font-weight:650;
   margin:2.75rem 0 .85rem;padding-top:1.25rem;border-top:1px solid var(--rule)}
h3{font-size:1.06rem;line-height:1.35;font-weight:650;margin:2rem 0 .6rem}
h2 span,h3 span{flex:1 1 auto}
h2:target,h3:target{color:var(--accent)}
p{margin:0 0 1rem}
ul{margin:0 0 1rem;padding-left:1.35rem}
li{margin:.25rem 0}
li::marker{color:var(--faint)}
em{font-style:italic}

/* rule-id chip on every heading */
.rid{flex:0 0 auto;order:2;font:600 .68rem/1.5 var(--mono);letter-spacing:.03em;
     color:var(--dim);background:var(--tag);border:1px solid var(--rule);
     border-radius:4px;padding:.05rem .4rem;white-space:nowrap}
.rid:hover{color:var(--accent);text-decoration:none;border-color:var(--accent)}

/* required / annex tag on a chapter's first line */
.status{color:var(--dim);font-size:.95rem}
.tag{display:inline-block;font:600 .68rem/1.5 var(--mono);letter-spacing:.06em;
     text-transform:uppercase;color:var(--accent);background:var(--tag);
     border-radius:4px;padding:.1rem .45rem;margin-right:.35rem;vertical-align:middle}

/* ---- code ---- */
code{font-family:var(--mono);font-size:.875em;background:var(--code-bg);
     border:1px solid var(--code-rule);border-radius:4px;padding:.08em .32em}
pre{font-family:var(--mono);font-size:.84rem;line-height:1.5;background:var(--code-bg);
    border:1px solid var(--code-rule);border-radius:6px;padding:.85rem 1rem;
    margin:0 0 1.15rem;overflow-x:auto;tab-size:4}
pre code{background:none;border:0;padding:0;font-size:inherit}
pre.tbl{white-space:pre}
pre + pre{margin-top:-.5rem}

/* ---- tables ---- */
.scroll{overflow-x:auto;margin:0 0 1.25rem}
table{border-collapse:collapse;width:100%;margin:.5rem 0 1.5rem;font-size:.92rem}
th,td{text-align:left;padding:.45rem .6rem;border-bottom:1px solid var(--rule);vertical-align:top}
th{font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--faint);font-weight:650}
td.n,th.n{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
td.rules code{font-size:.72rem;padding:.03em .3em;margin:0 .15rem .15rem 0;white-space:nowrap}
td a.src,p.src a{font-family:var(--mono);font-size:.85em}
p.src{color:var(--dim);font-size:.88rem;margin-top:3rem;padding-top:1rem;border-top:1px solid var(--rule)}
.note{color:var(--dim);font-size:.86em}
.empty{color:var(--dim)}

/* ---- test-suite page ---- */
.dl{display:flex;flex-wrap:wrap;gap:.9rem;align-items:center;margin:0 0 1.5rem}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:.55rem 1rem;
     border-radius:6px;font-weight:600;font-size:.94rem}
.btn:hover{text-decoration:none;filter:brightness(1.07)}
.bar{display:inline-block;width:5rem;height:.5rem;margin-right:.5rem;border-radius:3px;
     background:linear-gradient(to right,var(--accent) var(--pct),var(--rule) var(--pct))}
/* chapter map on the spec index */
table.chapters td:first-child a{font-family:var(--mono);font-size:.9em;white-space:nowrap}
table.chapters td:nth-child(2){white-space:nowrap}
.tag.annex{color:var(--dim)}