/* airt house style. Quiet by design: chrome recedes, ideas lead.
   Palette sampled from the Project Ingle cover artwork.
   Source Serif 4 (body) + Source Sans 3 (headings), self-hosted.
   Weights available: Regular / Italic / Bold / BoldItalic only. */

@font-face{font-family:"Source Serif 4";src:url("/fonts/SourceSerif4-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url("/fonts/SourceSerif4-It.woff2") format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url("/fonts/SourceSerif4-Bold.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url("/fonts/SourceSerif4-BoldIt.woff2") format("woff2");font-weight:700;font-style:italic;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("/fonts/SourceSans3-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("/fonts/SourceSans3-It.woff2") format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("/fonts/SourceSans3-Bold.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("/fonts/SourceSans3-BoldIt.woff2") format("woff2");font-weight:700;font-style:italic;font-display:swap}

:root{
  --ink:#23292E;          /* body text: dark slate, softer than pure black */
  --title:#2C3A47;        /* AirtTitle slate: headings, masthead */
  --accent:#684D37;       /* AirtAccent brick: rules, hover */
  --rule:#BFC5CE;         /* hairlines: darker tint of the page grey */
  --faint:#5A6875;        /* muted meta text (sampled from artwork shadow) */
  --paper:#DDE1E8;        /* page: the artwork's pale cool grey field */
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  --sans:"Source Sans 3",-apple-system,system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  --measure:40rem;
}

*{box-sizing:border-box}
html{font-size:18px}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--serif);line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}

.wrap{max-width:var(--measure);margin:0 auto;padding:0 1.25rem}

/* masthead: no dark band. Quiet line of type with a thin brick rule. */
.masthead{border-bottom:1px solid var(--rule)}
.masthead .wrap{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  padding-top:1.4rem;padding-bottom:1.1rem;gap:.6rem}
.brand{font-family:var(--sans);font-weight:700;font-size:1.4rem;letter-spacing:.01em;
  text-decoration:none;color:var(--title)}
.brand:hover{color:var(--title)}
.brand .dot{color:var(--accent)}
.tagline{font-family:var(--sans);font-size:.85rem;color:var(--faint);margin-left:.6rem;font-weight:400}
nav.main{font-family:var(--sans);font-size:.95rem}
nav.main a{color:var(--title);text-decoration:none;margin-left:1.25rem;
  border-bottom:1px solid transparent;padding-bottom:2px}
nav.main a:hover{border-bottom-color:var(--accent)}

main{padding:3rem 0 2rem}
h1,h2,h3,h4{font-family:var(--sans);color:var(--title);line-height:1.25;font-weight:700}
h1{font-size:1.9rem;margin:0 0 .4rem}
h2{font-size:1.35rem;margin:2.2rem 0 .6rem}
h3{font-size:1.1rem;margin:1.8rem 0 .5rem}
p,ul,ol,blockquote,table{margin:0 0 1.1rem}
a{color:var(--title);text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:2px;text-decoration-thickness:1px}
a:hover{color:var(--accent)}
strong{font-weight:700}
em{font-style:italic}

blockquote{margin-left:0;padding-left:1.1rem;border-left:3px solid var(--accent);
  color:var(--faint);font-style:italic}
hr{border:0;border-top:1px solid var(--rule);margin:2.5rem 0}

table{border-collapse:collapse;width:100%;font-size:.95rem;font-family:var(--sans)}
th,td{text-align:left;padding:.45rem .6rem;border-bottom:1px solid var(--rule)}
th{color:var(--title);font-weight:700}

code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}
pre{background:#D2D7DF;padding:1rem;overflow:auto;border:1px solid var(--rule)}
code{background:#D2D7DF;padding:.1em .3em}
pre code{background:none;padding:0}

.paper-list{list-style:none;padding:0;margin:2rem 0}
.paper-list li{padding:1.1rem 0;border-bottom:1px solid var(--rule)}
.paper-list li:first-child{border-top:1px solid var(--rule)}
.paper-list .title{font-family:var(--sans);font-weight:700;font-size:1.15rem}
.paper-list .title a{text-decoration:none;color:var(--title)}
.paper-list .title a:hover{color:var(--accent)}
.paper-list .summary{color:var(--ink);margin:.35rem 0 0}
.meta{font-family:var(--sans);font-size:.8rem;color:var(--faint);text-transform:uppercase;letter-spacing:.04em}

.paper-meta{font-family:var(--sans);font-size:.85rem;color:var(--faint);margin:0 0 2rem}
.pdf-link{display:inline-block;font-family:var(--sans);font-size:.9rem;font-weight:700;
  color:var(--accent);text-decoration:none;border:1px solid var(--rule);padding:.45rem .8rem;margin:1.5rem 0}
.pdf-link:hover{color:var(--paper);background:var(--accent);border-color:var(--accent)}

footer{border-top:1px solid var(--rule);margin-top:3rem;padding:2rem 0;
  font-family:var(--sans);font-size:.82rem;color:var(--faint)}
footer a{color:var(--faint)}
footer a:hover{color:var(--accent)}

@media(max-width:34rem){
  html{font-size:17px}
  .masthead .wrap{flex-direction:column;align-items:flex-start}
  nav.main a{margin-left:0;margin-right:1.1rem}
}

@media print{
  .masthead,nav.main,footer,.pdf-link{display:none}
  body{background:#fff;color:#000}
  a{color:#000;text-decoration:none}
}