/* ==========================================================================
   blog.mrandrej.com — design system
   Tokens extracted 1:1 from mrandrej.com so the two sites read as siblings.
   ========================================================================== */

:root{
  --paper:#F3F4F1;
  --card:#FBFBF9;
  --ink:#181D28;
  --ink-soft:#3A4152;
  --muted:#6A7180;
  --line:#D8DAD3;
  --slate:#5E6EA4;
  --slate-deep:#48548A;
  --slate-wash:#E8EAF2;
  --amber:#B5772A;
  --footer-bg:#181D28;
  --shadow:rgba(24,29,40,.35);
  --max:1080px;
  --measure:730px;
  --radius:10px;
}

[data-theme="dark"]{
  --paper:#14171F;
  --card:#1C202B;
  --ink:#E8EAF0;
  --ink-soft:#B4BAC8;
  --muted:#8A90A0;
  --line:#2A2F3C;
  --slate:#7D8CC4;
  --slate-deep:#93A2D8;
  --slate-wash:#262C40;
  --amber:#D19A4F;
  --footer-bg:#0E1118;
  --shadow:rgba(0,0,0,.55);
}

/* ---------- Base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Instrument Sans',system-ui,sans-serif;
  font-size:1rem;line-height:1.65;
  -webkit-font-smoothing:antialiased;
  transition:background .25s ease,color .25s ease;
}
a{color:var(--slate-deep);text-decoration:none}
a:hover{text-decoration:underline}
.mono{font-family:'Spline Sans Mono',monospace}
::selection{background:var(--slate-wash);color:var(--ink)}

/* ---------- Header ---------- */
header{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.hwrap{
  max-width:var(--max);margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;gap:28px;
}
.wordmark{
  font-family:'Spline Sans Mono',monospace;
  font-weight:600;font-size:.95rem;letter-spacing:.06em;
  color:var(--ink);
}
.wordmark:hover{text-decoration:none;color:var(--slate-deep)}
.wordmark .slash{color:var(--amber)}
nav{display:flex;gap:22px;margin-left:auto}
nav a{font-size:.88rem;font-weight:500;color:var(--ink-soft)}
nav a:hover{color:var(--slate-deep);text-decoration:none}
nav a[aria-current="page"]{color:var(--slate-deep)}
.theme-toggle{
  border:1px solid var(--line);background:var(--card);color:var(--ink-soft);
  width:34px;height:34px;border-radius:50%;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;flex:none;
  transition:border-color .2s ease,color .2s ease;
}
.theme-toggle:hover{border-color:var(--slate);color:var(--slate-deep)}
.theme-toggle svg{width:16px;height:16px}
.icon-sun{display:none}
[data-theme="dark"] .icon-sun{display:block}
[data-theme="dark"] .icon-moon{display:none}
/* ---------- Burger / mobile nav ---------- */
.burger{
  border:1px solid var(--line);background:var(--card);color:var(--ink-soft);
  width:34px;height:34px;border-radius:50%;cursor:pointer;flex:none;
  display:none;align-items:center;justify-content:center;
  transition:border-color .2s ease,color .2s ease;
}
.burger:hover{border-color:var(--slate);color:var(--slate-deep)}
.burger svg{width:16px;height:16px}
.burger .icon-close{display:none}
.burger[aria-expanded="true"] .icon-close{display:block}
.burger[aria-expanded="true"] .icon-bars{display:none}
.mobile-nav{
  display:none;flex-direction:column;padding:6px 24px 16px;
  border-bottom:1px solid var(--line);background:var(--paper);
}
.mobile-nav.open{display:flex}
.mobile-nav a{
  padding:11px 0;font-size:.95rem;font-weight:500;color:var(--ink-soft);
  border-top:1px solid var(--line);
}
.mobile-nav a:first-child{border-top:0}
.mobile-nav a:hover{color:var(--slate-deep);text-decoration:none}
.mobile-nav a[aria-current="page"]{color:var(--slate-deep)}
@media (min-width:641px){.mobile-nav{display:none}}

@media (max-width:640px){
  .hwrap>nav{display:none}
  .theme-toggle{margin-left:auto}
  .burger{display:inline-flex}
}

/* ---------- Layout ---------- */
main{max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- Blog index ---------- */
.hero{padding:88px 0 40px;max-width:var(--measure)}
.sec-label{
  font-family:'Spline Sans Mono',monospace;
  font-size:.75rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--slate-deep);
  display:flex;align-items:center;gap:12px;margin:0 0 18px;
}
.sec-label::after{content:"";height:1px;flex:1;background:var(--line)}
.hero h1{
  font-family:'Archivo',sans-serif;font-weight:800;
  font-size:clamp(2.2rem,5vw,3.4rem);line-height:1.05;
  letter-spacing:-.02em;margin:0 0 18px;
}
.hero h1 .accent{color:var(--amber)}
.lede{font-size:1.12rem;color:var(--ink-soft);margin:0 0 8px;max-width:60ch}
.hero .sub{font-family:'Spline Sans Mono',monospace;font-size:.85rem;color:var(--muted)}

.posts{padding:24px 0 96px;max-width:var(--measure)}
.post-card{
  display:block;
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--card);
  padding:26px 28px;margin:0 0 20px;
  color:var(--ink);
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.post-card:hover{
  text-decoration:none;
  border-color:var(--slate);
  transform:translateY(-2px);
  box-shadow:0 8px 28px -12px var(--shadow);
}
.post-card .meta{
  font-family:'Spline Sans Mono',monospace;font-size:.78rem;
  color:var(--muted);letter-spacing:.03em;
  display:flex;gap:14px;flex-wrap:wrap;margin:0 0 10px;
}
.post-card .meta .series{color:var(--amber);font-weight:600}
.post-card h2{
  font-family:'Archivo',sans-serif;font-weight:700;
  font-size:1.45rem;letter-spacing:-.01em;line-height:1.2;margin:0 0 8px;
}
.post-card p{margin:0;color:var(--ink-soft);font-size:.98rem}
.post-card .read{
  display:inline-block;margin-top:14px;
  font-family:'Spline Sans Mono',monospace;font-size:.8rem;font-weight:600;
  color:var(--slate-deep);
}

/* ---------- Article ---------- */
article{max-width:var(--measure);margin:0 auto;padding:56px 0 96px}
.post-head{margin:0 0 40px}
.post-head .meta{
  font-family:'Spline Sans Mono',monospace;font-size:.8rem;color:var(--muted);
  display:flex;gap:14px;flex-wrap:wrap;margin:0 0 14px;
}
.post-head .meta .series{color:var(--amber);font-weight:600}
.post-head h1{
  font-family:'Archivo',sans-serif;font-weight:800;
  font-size:clamp(1.9rem,4.5vw,2.7rem);line-height:1.1;
  letter-spacing:-.02em;margin:0 0 14px;
}
.post-head .standfirst{font-size:1.1rem;color:var(--ink-soft);margin:0}

article h2{
  font-family:'Archivo',sans-serif;font-weight:700;
  font-size:1.5rem;letter-spacing:-.01em;
  margin:52px 0 14px;padding-top:8px;
}
article h3{
  font-family:'Archivo',sans-serif;font-weight:600;
  font-size:1.12rem;margin:34px 0 10px;
}
article p{margin:0 0 16px}
article ul,article ol{margin:0 0 16px;padding-left:24px}
article li{margin:0 0 6px}
article li::marker{color:var(--slate)}
strong{font-weight:600}

code{
  font-family:'Spline Sans Mono',monospace;font-size:.86em;
  background:var(--slate-wash);color:var(--ink);
  padding:.12em .4em;border-radius:5px;
}
pre{
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px 20px;overflow-x:auto;
  margin:0 0 20px;font-size:.85rem;line-height:1.55;
}
pre code{background:none;padding:0;font-size:inherit}
pre .c{color:var(--muted)}   /* comments */
pre .k{color:var(--slate-deep)} /* keywords */
pre .s{color:var(--amber)}   /* strings */

/* Callouts — used for trade-off notes and decisions */
.callout{
  border:1px solid var(--line);border-left:3px solid var(--slate);
  border-radius:0 var(--radius) var(--radius) 0;
  background:var(--card);
  padding:16px 20px;margin:0 0 20px;
}
.callout .label{
  font-family:'Spline Sans Mono',monospace;font-size:.72rem;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;color:var(--slate-deep);
  display:block;margin:0 0 6px;
}
.callout.amber{border-left-color:var(--amber)}
.callout.amber .label{color:var(--amber)}
.callout p{margin:0 0 8px}
.callout p:last-child{margin:0}

/* Decision table */
table{
  width:100%;border-collapse:separate;border-spacing:0;margin:0 0 24px;
  font-size:.92rem;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius);
}
tr:first-child th:first-child{border-top-left-radius:var(--radius)}
tr:first-child th:last-child{border-top-right-radius:var(--radius)}
tr:last-child td:first-child{border-bottom-left-radius:var(--radius)}
tr:last-child td:last-child{border-bottom-right-radius:var(--radius)}
td.mono{white-space:nowrap}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{
  font-family:'Spline Sans Mono',monospace;font-size:.72rem;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
  background:color-mix(in srgb, var(--slate-wash) 45%, transparent);
}
tr:last-child td{border-bottom:0}

/* Figures & inline SVG diagrams */
figure{margin:28px 0 32px}
figure svg{
  display:block;width:100%;height:auto;
  background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);
}
figcaption{
  font-family:'Spline Sans Mono',monospace;font-size:.78rem;
  color:var(--muted);margin-top:10px;text-align:center;
}
/* Inline post images (memes, screenshots): responsive, framed, centered */
.post-img{
  display:block;max-width:100%;height:auto;
  margin:20px auto;
  border:1px solid var(--line);border-radius:var(--radius);
}
/* SVG element classes (used inside diagrams) */
.d-box{fill:var(--card);stroke:var(--line);stroke-width:1.5}
.d-box-accent{fill:var(--slate-wash);stroke:var(--slate);stroke-width:1.5}
.d-container{fill:none;stroke:var(--slate);stroke-width:1.5;stroke-dasharray:6 5}
.d-arrow{stroke:var(--muted);stroke-width:1.5;fill:none;marker-end:url(#arrowhead)}
.d-arrow-dashed{stroke:var(--muted);stroke-width:1.5;fill:none;stroke-dasharray:5 4;marker-end:url(#arrowhead)}
.d-label{font-family:'Spline Sans Mono',monospace;fill:var(--ink)}
.d-sub{font-family:'Spline Sans Mono',monospace;fill:var(--muted)}
.d-accent{fill:var(--slate-deep)}
.d-amber{fill:var(--amber)}
.d-marker-fill{fill:var(--muted)}

hr{
  border:0;height:1px;background:var(--line);margin:48px 0;
}

/* Glossary / field guide */
.gloss h3{margin:40px 0 4px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.gloss dl{margin:0 0 8px}
.gloss dt{
  font-family:'Spline Sans Mono',monospace;font-size:.92rem;font-weight:600;
  color:var(--slate-deep);margin:20px 0 0;
}
.gloss dd{margin:4px 0 0;color:var(--ink-soft)}
.gloss dd code{font-size:.82em}

/* Post footer nav */
.post-nav{
  display:flex;justify-content:space-between;gap:16px;
  border-top:1px solid var(--line);padding-top:24px;margin-top:56px;
  font-family:'Spline Sans Mono',monospace;font-size:.85rem;
}

/* ---------- Footer ---------- */
footer{
  background:var(--footer-bg);color:#B4BAC8;
  margin-top:0;
}
.fwrap{
  max-width:var(--max);margin:0 auto;padding:36px 24px;
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;
  font-family:'Spline Sans Mono',monospace;font-size:.8rem;
}
footer a{color:#93A2D8}
footer .spacer{margin-left:auto}