/* Arf documentation — shared styles. Ink on paper, EB Garamond, one iron-gall accent. */
@font-face{
  font-family:'EB Garamond';font-style:normal;font-weight:400 800;font-display:swap;
  src:url(fonts/ebgaramond-normal.woff2) format('woff2');
}
@font-face{
  font-family:'EB Garamond';font-style:italic;font-weight:400 800;font-display:swap;
  src:url(fonts/ebgaramond-italic.woff2) format('woff2');
}

:root{
  --canvas:#faf9f7; --fg:#2a2a2a; --fg-bright:#0a0a0a; --fg-muted:#595959; --fg-faint:#737373;
  --line:#e3e3e3; --line-strong:#cfcfcf; --surface:#ffffff;
  --accent:#2c4a6e; --accent-soft:#2c4a6e1f; --ser-wght:400;
  --serif:'EB Garamond', Georgia, Cambria, 'Times New Roman', serif;
  --sans:ui-sans-serif, -apple-system, 'Segoe UI', Roboto, system-ui, sans-serif;
  --mono:ui-monospace, 'SF Mono', 'SFMono-Regular', Menlo, Consolas, monospace;
}
html[data-theme="dark"]{
  --canvas:#0a0a0a; --fg:#e5e5e5; --fg-bright:#fafafa; --fg-muted:#a3a3a3; --fg-faint:#8a8a8a;
  --line:#262626; --line-strong:#404040; --surface:#141414;
  --accent:#7fa8c9; --accent-soft:#7fa8c92e; --ser-wght:440;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;}}
body{
  margin:0; background:var(--canvas); color:var(--fg);
  font-family:var(--serif); font-weight:var(--ser-wght);
  /* fluid type: ~17px on phones, ~20px on laptops, up to ~21.5px on large/ultrawide */
  font-size:clamp(17px, 0.42vw + 14.6px, 21.5px); line-height:1.65;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  font-feature-settings:"kern" 1,"liga" 1,"onum" 1;
  transition:background .3s ease, color .3s ease;
}
::selection{background:var(--accent-soft);}
a{color:inherit; text-decoration:underline; text-decoration-color:var(--fg-faint); text-underline-offset:3px; transition:text-decoration-color .15s;}
a:hover{text-decoration-color:var(--accent);}

/* running header */
.topbar{
  position:sticky; top:0; z-index:20; background:var(--canvas); border-bottom:1px solid var(--line);
  display:flex; align-items:center; gap:1rem; padding:.7rem clamp(1rem,5vw,2.5rem);
}
.topbar .wm{font-family:var(--serif); font-weight:600; font-size:22px; color:var(--fg-bright); text-decoration:none; letter-spacing:.01em;}
.topbar .wm .dot{color:var(--accent);}
.topbar nav{display:flex; gap:1.1rem; flex-wrap:wrap; margin-left:1rem;}
.topbar nav a{font-family:var(--sans); font-size:13px; letter-spacing:.01em; color:var(--fg-muted); text-decoration:none; padding:.2rem 0; border-bottom:2px solid transparent;}
.topbar nav a:hover{color:var(--fg-bright);}
.topbar nav a.on{color:var(--fg-bright); border-bottom-color:var(--accent);}
.topbar .sp{flex:1;}
.toggle{font-family:var(--sans); font-size:11px; letter-spacing:.08em; text-transform:uppercase; background:none; border:1px solid var(--line-strong); color:var(--fg-muted); padding:.4rem .7rem; border-radius:2px; cursor:pointer; transition:border-color .2s,color .2s;}
.toggle:hover{border-color:var(--accent); color:var(--fg-bright);}
.toggle:focus-visible{outline:2px solid var(--accent); outline-offset:2px;}

/* reading column — widens with the viewport, capped so text and content boxes share one measure */
main{max-width:min(860px, 92vw); margin:0 auto; padding:0 clamp(1.1rem,4vw,3rem) 5rem;}
.eyebrow{font-family:var(--sans); font-size:12px; letter-spacing:.14em; text-transform:uppercase; color:var(--fg-faint); margin:3rem 0 .6rem;}
h1{font-size:clamp(34px,6vw,48px); line-height:1.08; color:var(--fg-bright); font-weight:600; text-wrap:balance; margin:.2rem 0 .4rem;}
.lede{font-size:clamp(20px,2.2vw,24px); color:var(--fg-muted); font-style:italic; margin:0 0 1.5rem; max-width:42ch; text-wrap:pretty;}
h2{font-size:clamp(24px,3vw,29px); line-height:1.2; color:var(--fg-bright); font-weight:600; margin:2.6rem 0 .5rem; border-top:1px solid var(--line); padding-top:2rem; text-wrap:balance;}
h3{font-size:clamp(19px,2vw,21px); color:var(--fg-bright); font-weight:600; margin:1.6rem 0 .3rem;}
p{margin:0 0 1rem;}
strong{font-weight:600; color:var(--fg-bright);}
em{font-style:italic;}
ul,ol{padding-left:1.3rem; margin:0 0 1rem;}
li{margin:.3rem 0;}
blockquote{margin:1.4rem 0; padding:.3rem 0 .3rem 1.2rem; border-left:2px solid var(--accent); font-style:italic; color:var(--fg-muted);}
blockquote cite{display:block; font-style:normal; font-family:var(--mono); font-size:12px; color:var(--fg-faint); margin-top:.5rem;}
code{font-family:var(--mono); font-size:.82em; background:var(--accent-soft); padding:.08em .35em; border-radius:3px;}
pre{font-family:var(--mono); font-size:13.5px; line-height:1.55; background:var(--surface); border:1px solid var(--line); border-radius:6px; padding:.9rem 1.1rem; overflow-x:auto; margin:1.2rem 0;}
pre code{background:none; padding:0; font-size:inherit;}
hr{border:0; border-top:1px solid var(--line); margin:2.5rem 0;}
.mono{font-family:var(--mono); font-size:.85em; color:var(--accent);}

/* callout */
.note{border:1px solid var(--line); border-left:2px solid var(--accent); border-radius:5px; padding:1rem 1.2rem; margin:1.4rem 0; background:var(--surface);}
.note .nlabel{font-family:var(--sans); font-size:10px; letter-spacing:.12em; text-transform:uppercase; color:var(--accent); display:block; margin-bottom:.35rem;}
.note p:last-child{margin-bottom:0;}

/* feature grid */
.grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(210px,1fr)); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:6px; overflow:hidden; margin:1.6rem 0;}
.grid.grid2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid.grid3{grid-template-columns:repeat(3,minmax(0,1fr));}
@media(max-width:620px){.grid.grid2,.grid.grid3{grid-template-columns:1fr;}}
.grid .cell{background:var(--surface); padding:1.2rem 1.3rem;}
.grid .cell h3{margin:.1rem 0 .4rem; font-size:18px;}
.grid .cell p{font-size:16px; color:var(--fg-muted); margin:0;}
.grid .cell .k{font-family:var(--sans); font-size:11px; letter-spacing:.1em; text-transform:uppercase; color:var(--accent);}

/* table */
.tbl{overflow-x:auto; margin:1.4rem 0;}
table{border-collapse:collapse; width:100%; font-size:16px;}
th{font-family:var(--sans); font-size:11px; letter-spacing:.08em; text-transform:uppercase; color:var(--fg-faint); text-align:left; padding:.5rem .7rem; border-bottom:1px solid var(--line-strong);}
td{padding:.5rem .7rem; border-bottom:1px solid var(--line); color:var(--fg-muted); vertical-align:top;}
td:first-child{color:var(--fg-bright);}
td code{font-size:12.5px;}

/* swatches (design page) */
.swatches{display:grid; grid-template-columns:repeat(auto-fit,minmax(84px,1fr)); gap:.5rem; margin:1.2rem 0;}
.sw{border:1px solid var(--line); border-radius:4px; overflow:hidden; font-family:var(--mono); font-size:10.5px;}
.sw .chip{height:56px;}
.sw .lab{padding:.3rem .45rem; color:var(--fg-muted); background:var(--surface);}
.sw .lab b{display:block; color:var(--fg-bright); font-weight:600; text-transform:uppercase; letter-spacing:.04em; font-size:9.5px;}

/* prev/next + footer */
.pager{display:flex; justify-content:space-between; gap:1rem; margin-top:3.5rem; border-top:1px solid var(--line); padding-top:1.5rem;}
.pager a{font-family:var(--sans); font-size:14px; text-decoration:none; color:var(--fg-muted); max-width:45%;}
.pager a:hover{color:var(--fg-bright);}
.pager a .dir{display:block; font-size:11px; letter-spacing:.1em; text-transform:uppercase; color:var(--fg-faint); margin-bottom:.2rem;}
.pager a.next{text-align:right; margin-left:auto;}
footer.site{border-top:1px solid var(--line); padding:1.5rem clamp(1rem,5vw,2.5rem); font-family:var(--sans); font-size:12.5px; color:var(--fg-faint); text-align:center;}
footer.site a{color:var(--fg-muted);}

/* hero (index) */
.hero{text-align:center; padding:clamp(2.5rem,8vw,5rem) 0 1rem;}
.hero .wordmark{font-family:var(--serif); font-weight:500; color:var(--fg-bright); font-size:clamp(64px,14vw,120px); line-height:.9;}
.hero .wordmark .dot{color:var(--accent);}
.hero .tagline{font-style:italic; font-size:clamp(19px,3vw,24px); color:var(--fg-muted); margin-top:.8rem;}
.hero .sub{font-size:20px; max-width:40ch; margin:1.6rem auto 0; text-wrap:pretty;}
.hero .cta{display:inline-flex; gap:.5rem; align-items:center; margin-top:1.8rem; font-family:var(--sans); font-size:15px; font-weight:500; color:var(--canvas); background:var(--accent); border:1px solid var(--accent); border-radius:8px; padding:.6rem 1.3rem; text-decoration:none;}
.hero .cta:hover{opacity:.9;}
.hero .ctasub{display:block; margin-top:.7rem; font-family:var(--sans); font-size:12.5px; color:var(--fg-faint);}
.cardnav{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:6px; overflow:hidden; margin:2.5rem 0;}
@media(max-width:700px){.cardnav{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(max-width:440px){.cardnav{grid-template-columns:1fr;}}
.cardnav a{background:var(--surface); padding:1.3rem 1.4rem; text-decoration:none; color:var(--fg); transition:background .15s;}
.cardnav a:hover{background:var(--accent-soft);}
.cardnav a .t{display:block; font-size:19px; color:var(--fg-bright); font-weight:600; margin-bottom:.25rem;}
.cardnav a .d{font-size:15px; color:var(--fg-muted);}

/* narrow screens: keep the wordmark and theme toggle on one row and let the nav sit on its own
   line as a single scrollable strip, instead of eight links wrapping into a crowded block */
@media(max-width:760px){
  .topbar{flex-wrap:wrap; gap:.5rem .9rem; padding:.6rem clamp(1rem,5vw,2.5rem);}
  .topbar .wm{order:1; font-size:20px;}
  .topbar .toggle{order:2; margin-left:auto;}
  .topbar .sp{display:none;}
  .topbar nav{order:3; flex-basis:100%; margin-left:0; gap:1.1rem; flex-wrap:nowrap;
    overflow-x:auto; -webkit-overflow-scrolling:touch; padding-bottom:.1rem; scrollbar-width:none;}
  .topbar nav::-webkit-scrollbar{display:none;}
  .topbar nav a{white-space:nowrap;}
}