/* Rogeha Studio — the shell shared by every page except projects/go-poschte/, which is a one-page
   site with its own styles inline. Fonts and colours are the Rogeha Studio design system's (DESIGN.md);
   the pages with their own styles use the same values: change one here and change it there too. */

/* IBM Plex, the design system's type: Sans for everything, Mono for measured values (SIL OFL, fonts/OFL-ibm-plex.txt) */
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/ibm-plex-sans-400.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/ibm-plex-sans-500.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Sans';font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/ibm-plex-sans-600.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/ibm-plex-mono-400.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/ibm-plex-mono-500.woff2) format('woff2')}

/* The Rogeha Studio design system's colour tokens, under the site's own names:
   paper = canvas, surface = surface, ink = ink, slate = ink-muted, line = border-subtle,
   accent = steel-500 (links, the current page, hovers), signal = signal-500 (the one call to action, dark text on it). */
:root{
  --paper:#f4f5f7;--surface:#ffffff;--ink:#14181c;--slate:#4d5862;--line:#e3e6ea;
  --accent:#2f5c8a;--accent-soft:#e4ecf5;--on-accent:#ffffff;
  --signal:#e0670f;--on-signal:#14181c;
  --display:"IBM Plex Sans","Helvetica Neue",Arial,sans-serif;
  --body:"IBM Plex Sans","Helvetica Neue",Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#101417;--surface:#171c20;--ink:#eef1f4;--slate:#a6b0b9;--line:#252c33;
    --accent:#5b93cc;--accent-soft:#1c2a38;--on-accent:#0b1218;
    --signal:#f28b3d;--on-signal:#14181c;
  }
}
:root[data-theme="dark"]{
  --paper:#101417;--surface:#171c20;--ink:#eef1f4;--slate:#a6b0b9;--line:#252c33;
  --accent:#5b93cc;--accent-soft:#1c2a38;--on-accent:#0b1218;
  --signal:#f28b3d;--on-signal:#14181c;
}

*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:1rem;line-height:1.65;-webkit-font-smoothing:antialiased}
.wrap{width:100%;max-width:860px;margin-inline:auto;padding-inline:20px}
.wrap.narrow{max-width:720px}

/* ---------- header and navigation ---------- */
.site-head{border-bottom:1px solid var(--line);padding-block:18px}
.site-head .wrap{display:flex;flex-wrap:wrap;gap:14px 24px;align-items:center;justify-content:space-between}
.brand{display:inline-flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none}
/* rogeha-tile-depth: the design system keeps the depth variants at 32px or more */
.brand .mark{width:32px;height:32px;display:block;flex:none}
.brand span{font-family:var(--display);font-weight:600;font-size:1.06rem;letter-spacing:-.02em}
.nav{display:flex;flex-wrap:wrap;gap:4px 20px;font-size:.92rem}
.nav a{color:var(--slate);text-decoration:none;padding-block:2px}
.nav a:hover{color:var(--accent)}
.nav a[aria-current="page"]{color:var(--ink);font-weight:600;box-shadow:inset 0 -2px 0 var(--accent)}

/* ---------- type ---------- */
h1,h2,h3{font-family:var(--display);font-weight:600;letter-spacing:-.02em;line-height:1.15;margin:0}
h1{font-size:clamp(2rem,5.4vw,3rem);margin:40px 0 14px}
h2{font-size:clamp(1.3rem,3vw,1.6rem);margin:52px 0 12px}
h3{font-size:1.06rem;font-weight:600;margin:0 0 6px}
p,ul,ol{margin:0 0 14px}
ul,ol{padding-left:1.25em}
li{margin-bottom:6px}
.banner{display:block;max-width:100%;height:auto;margin-top:40px}
.lede{font-size:clamp(1.08rem,2.4vw,1.3rem);line-height:1.5;color:var(--slate);max-width:60ch;margin-bottom:26px}
.muted{color:var(--slate)}
.label{font-family:var(--mono);font-size:.7rem;letter-spacing:.11em;text-transform:uppercase;color:var(--slate)}
a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:3px}
a:hover{color:var(--accent)}

/* ---------- blocks ---------- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:20px 22px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:16px;margin:22px 0}
.card p:last-child{margin-bottom:0}
.card-link{display:block;color:var(--ink);text-decoration:none;transition:border-color 120ms ease-out}
.card-link:hover{color:var(--ink);border-color:var(--accent)}
.card .label{display:block;margin-bottom:9px}
.cta{display:inline-block;background:var(--signal);color:var(--on-signal);text-decoration:none;font-weight:600;border-radius:11px;padding:11px 20px;margin-top:6px}
.cta:hover{color:var(--on-signal);filter:brightness(1.07)}
.rule{border:0;border-top:1px solid var(--line);margin:46px 0 0}
.deflist{display:grid;grid-template-columns:minmax(0,9.5rem) minmax(0,1fr);gap:8px 18px;margin:0}
.deflist dt{font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--slate);padding-top:4px}
.deflist dd{margin:0;overflow-wrap:anywhere}

/* ---------- footer ---------- */
.site-foot{margin-top:60px;border-top:1px solid var(--line);padding-block:28px 46px;color:var(--slate);font-size:.86rem}
.site-foot .row{display:flex;flex-wrap:wrap;gap:10px 22px;justify-content:space-between;align-items:center}
.site-foot .fine{margin:20px 0 0;max-width:72ch;font-size:.81rem;line-height:1.55}
.site-foot .copyright{margin:9px 0 0;font-size:.81rem}

@media (max-width:520px){
  .deflist{grid-template-columns:minmax(0,1fr)}
  .deflist dt{padding-top:10px}
}