:root{
  --bg: oklch(99% 0.002 240);
  --surface: oklch(100% 0 0);
  --fg: oklch(19% 0.014 255);
  --body: oklch(29% 0.018 255);
  --muted: oklch(52% 0.012 255);
  --border: oklch(92% 0.006 255);
  --border-strong: oklch(86% 0.008 255);
  --accent: oklch(55% 0.17 262);
  --tint: oklch(97% 0.004 255);

  --font-display: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, 'JetBrains Mono', Menlo, Consolas, monospace;

  --wrap: 1180px;
  --measure: 720px;
  --radius: 6px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--bg);
  color:var(--fg);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3{font-family:var(--font-display);font-weight:600;line-height:1.12;letter-spacing:-0.02em;text-wrap:balance}
p{text-wrap:pretty}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(20px,4vw,40px)}
.skip{position:absolute;left:-9999px;top:0;background:var(--fg);color:var(--bg);padding:10px 16px;z-index:100}
.skip:focus{left:12px;top:12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

.kicker{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.16em;
  text-transform:uppercase;
  color:var(--accent);
}
.meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.04em;
  color:var(--muted);
}

.progress{
  position:fixed;top:0;left:0;height:3px;width:0;
  background:var(--accent);z-index:60;transition:width .08s linear;
}

.site-header{
  position:sticky;top:0;z-index:50;
  background:color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;gap:24px;min-height:70px}
.wordmark{
  font-family:var(--font-display);font-weight:700;font-size:22px;letter-spacing:-0.03em;
  display:inline-flex;align-items:baseline;gap:4px;
}
.wordmark::after{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);transform:translateY(-1px)}
.primary-nav{margin-left:auto}
.primary-nav ul{display:flex;gap:4px;list-style:none}
.primary-nav a{
  display:inline-block;padding:8px 12px;border-radius:var(--radius);
  font-size:14.5px;color:var(--muted);transition:color .15s, background .15s;
}
.primary-nav a:hover{color:var(--fg);background:var(--tint)}
.primary-nav a.is-active{color:var(--fg)}
.header-actions{display:flex;align-items:center;gap:6px;margin-left:8px}
.icon-btn{
  width:38px;height:38px;border-radius:var(--radius);display:grid;place-items:center;
  color:var(--muted);border:1px solid transparent;transition:.15s;
}
.icon-btn:hover{color:var(--fg);border-color:var(--border);background:var(--surface)}
.icon-btn svg{width:18px;height:18px}
.menu-toggle{display:none}

.post{padding:clamp(26px,3.4vw,44px) 0 clamp(52px,6vw,84px)}
.post-head{max-width:var(--measure);margin:0 auto}
.back-link{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.06em;text-transform:uppercase;
  color:var(--muted);transition:color .15s;
}
.back-link:hover{color:var(--accent)}
.back-link svg{width:14px;height:14px}
.post-head .kicker{display:block;margin-top:22px}
.post h1{font-size:clamp(30px,4.4vw,54px);margin:12px 0 20px;line-height:1.06}
.post-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.post-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--border-strong)}

.post-hero{max-width:var(--wrap);margin:clamp(26px,3.6vw,44px) auto clamp(30px,4vw,52px)}
.post-hero img{
  width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--radius);
  background:var(--tint);
}
.post-hero figcaption{
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.03em;
  color:var(--muted);margin-top:12px;
}

.post-body{max-width:var(--measure);margin:0 auto}
.post-body p{
  font-size:18.5px;line-height:1.75;color:var(--body);margin-bottom:1.35em;
}
.post-body > p:first-of-type{font-size:20px;line-height:1.68;color:var(--fg)}
.post-body h2{font-size:clamp(23px,2.6vw,31px);margin:1.9em 0 .6em}
.post-body h3{font-size:clamp(18px,2vw,21px);margin:1.6em 0 .45em}
.post-body strong{font-weight:600;color:var(--fg)}

.post-footer{
  max-width:var(--measure);margin:clamp(40px,5vw,64px) auto 0;padding-top:26px;
  border-top:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
.post-topic{
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.08em;text-transform:uppercase;
  color:var(--muted);
}

.site-footer{border-top:1px solid var(--border);padding:clamp(44px,5vw,64px) 0 34px;margin-top:clamp(24px,3vw,40px)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.footer-brand .wordmark{margin-bottom:12px}
.footer-brand p{color:var(--muted);font-size:14.5px;max-width:32ch}
.footer-section-title{font-family:var(--font-mono);font-size:11px;letter-spacing:0.14em;text-transform:uppercase;color:var(--muted);margin-bottom:14px;font-weight:400;display:block}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.footer-col a{font-size:14.5px;color:var(--fg);opacity:.82}
.footer-col a:hover{opacity:1;color:var(--accent)}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--border);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:12px;letter-spacing:0.04em;color:var(--muted);
}

@media (max-width:720px){
  body{font-size:16px}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    background:var(--surface);border-bottom:1px solid var(--border);
    max-height:0;overflow:hidden;transition:max-height .25s ease;box-shadow:0 18px 40px -28px rgba(0,0,0,.4);
  }
  .primary-nav.open{max-height:340px}
  .primary-nav ul{flex-direction:column;gap:0;padding:10px 12px 18px}
  .primary-nav a{padding:12px 12px;font-size:16px;border-radius:var(--radius)}
  .menu-toggle{display:grid}
  .post-body p{font-size:17.5px}
  .post-body > p:first-of-type{font-size:18.5px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
}