/*
  Copyright (c) 2026 Pierre Barre. All rights reserved.
  Shared styles for the ZeroFS blog. Tokens and chrome mirror ../index.html.
*/
:root {
  --bg: #0a0a09;
  --bg-raise: #111110;
  --panel: rgba(255, 255, 255, 0.035);
  --panel-hover: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.09);
  --line-bright: rgba(255, 255, 255, 0.22);
  --text: #f4f3ef;
  --text-read: #e7e6e1;
  --text-dim: #a8a69e;
  --text-faint: #6e6c64;
  --accent: #4d9fff;
  --accent-soft: rgba(77, 159, 255, 0.13);
  --sans: "Schibsted Grotesk", sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "Geist Mono", monospace;
  --r: 12px;
  --measure: 44rem;   /* shared reading width: prose and blocks line up on both edges */
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
::selection { background: var(--accent); color: #0a0a09; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: radial-gradient(ellipse 90% 50% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 50% at 50% 0%, #000 30%, transparent 75%);
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 32px; position: relative; z-index: 1; }

/* ---------- header ---------- */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease;
}
header.scrolled {
  background: rgba(10, 10, 9, 0.96);
  border-bottom-color: var(--line);
  backdrop-filter: blur(8px);
}
.bar {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1180px; height: 72px;
  margin: 0 auto;
  padding: 0 32px;
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand svg { display: block; color: var(--text); }
.brand .mark {
  width: 36px; height: 36px;
  filter: drop-shadow(0 0 12px rgba(255,255,255,0.18));
  transition: filter .2s;
}
.brand:hover .mark { filter: drop-shadow(0 0 18px rgba(255,255,255,0.35)); }
.brand .wm { width: 84px; height: 18.1px; }
nav { display: flex; align-items: center; gap: 6px; }
nav a {
  font-size: 14px; font-weight: 500; letter-spacing: -0.005em;
  color: var(--text-dim);
  padding: 8px 13px; border-radius: 8px;
  transition: color .15s, background .15s;
}
nav a:hover { color: var(--text); background: var(--panel-hover); }
nav a[aria-current="page"] { color: var(--text); }
nav a.gh { display: flex; align-items: center; gap: 7px; }
nav a.gh svg { display: block; opacity: 0.9; }
nav a.gh span { font-family: var(--mono); font-size: 12.5px; }
nav a.cta {
  color: #0a0a09; background: var(--text);
  font-weight: 600; font-size: 14px;
  margin-left: 14px;
  padding: 10px 20px; border-radius: 999px;
  transition: transform .15s, box-shadow .15s, background .15s;
}
nav a.cta:hover {
  background: #fff; transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(255,255,255,0.22);
}

main { position: relative; z-index: 1; }

/* ---------- shared section head ---------- */
.sec-head { display: flex; align-items: baseline; gap: 18px; padding-top: 76px; }
.sec-head .idx { font-family: var(--mono); font-size: 12.5px; color: var(--accent); letter-spacing: 0.08em; }
.sec-head .label {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-faint);
}

/* ---------- blog index ---------- */
.idx-hero { padding: 168px 0 56px; border-bottom: 1px solid var(--line); }
.idx-hero .eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent);
}
.idx-hero h1 {
  margin-top: 16px;
  font-weight: 800; letter-spacing: -0.03em;
  font-size: clamp(40px, 6vw, 68px); line-height: 1.02;
  background: linear-gradient(180deg, #fff 55%, rgba(255,255,255,0.62));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.idx-hero p { margin-top: 18px; max-width: 600px; font-family: var(--serif); font-size: 19px; line-height: 1.55; color: var(--text-read); }

.post-list { padding: 8px 0 96px; }
.post-row {
  display: block; padding: 36px 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left .25s ease;
}
.post-row:hover { padding-left: 10px; }
.post-row .meta {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em;
  color: var(--text-faint); display: flex; gap: 14px; flex-wrap: wrap;
}
.post-row .meta .tag { color: var(--accent); }
.post-row h2 {
  margin-top: 14px; font-weight: 800; letter-spacing: -0.03em;
  font-size: clamp(24px, 3.2vw, 34px); line-height: 1.12; max-width: 18em;
  background: linear-gradient(180deg, #fff 62%, rgba(255,255,255,0.72));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.post-row p { margin-top: 12px; max-width: 660px; font-family: var(--serif); font-size: 17.5px; line-height: 1.55; color: var(--text-read); }
.post-row .more {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 18px;
  font-family: var(--mono); font-size: 13px; color: var(--accent);
}
.post-row .more .arrow { transition: transform .2s; }
.post-row:hover .more .arrow { transform: translateX(5px); }

/* ---------- article ---------- */
.post-hero {
  padding: 156px 0 0;
  position: relative; overflow: clip;
  border-bottom: 1px solid var(--line);
}
.post-hero::before {
  content: ""; position: absolute; inset: -40% -20% auto;
  height: 120%;
  background: radial-gradient(ellipse 40% 50% at 50% 0%, var(--accent-soft), transparent 70%);
  pointer-events: none;
}
.post-hero .wrap { max-width: 820px; padding-bottom: 56px; }
.post-hero .eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent);
}
.post-hero h1 {
  margin-top: 18px;
  font-weight: 800; letter-spacing: -0.032em;
  font-size: clamp(34px, 5.4vw, 60px); line-height: 1.04; max-width: 16em;
  background: linear-gradient(180deg, #fff 58%, rgba(255,255,255,0.66));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.post-hero .post-meta {
  margin-top: 26px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.04em;
  color: var(--text-faint); display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
}
.post-hero .post-meta .dot { color: var(--line-bright); }

.post { padding-bottom: 40px; }
.post .wrap { max-width: 820px; }
.post .lede {
  font-family: var(--serif);
  font-size: 23px; line-height: 1.5; color: var(--text);
  padding: 48px 0 8px; max-width: var(--measure); letter-spacing: 0;
}
.post .lede em { font-style: italic; }
.post h2 {
  margin-top: 16px;
  font-weight: 800; letter-spacing: -0.03em;
  font-size: clamp(27px, 3.4vw, 38px); line-height: 1.1; max-width: 16em;
  background: linear-gradient(180deg, #fff 62%, rgba(255,255,255,0.72));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.post h3 {
  margin-top: 44px; font-weight: 700; font-size: 20px; letter-spacing: -0.015em;
  color: var(--text);
}
.post p, .post li { font-family: var(--serif); font-size: 18.5px; line-height: 1.68; color: var(--text-read); }
.post p { margin-top: 22px; max-width: var(--measure); }
/* justify the intro and flowing body paragraphs (not callouts, lists, or table);
   only worthwhile at a wide measure — see the mobile override below */
.post .body > p { text-align: justify; -webkit-hyphens: auto; hyphens: auto; hyphenate-limit-chars: 7 3 3; }
.post em { font-style: italic; }
.post .body > p:first-of-type { margin-top: 28px; }
.post strong { color: var(--text); font-weight: 600; }
.post a:not(.btn) { color: var(--text); border-bottom: 1px solid var(--line-bright); transition: border-color .15s; }
.post a:not(.btn):hover { border-bottom-color: var(--accent); }
.post ul, .post ol { margin: 18px 0 0; padding-left: 22px; max-width: var(--measure); }
.post li { margin-top: 10px; line-height: 1.68; }
.post li::marker { color: var(--text-faint); }
.post code {
  font-family: var(--mono); font-size: 0.86em; color: var(--text);
  background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px;
}

/* code blocks */
.post pre {
  margin-top: 26px;
  background: var(--bg-raise); border: 1px solid var(--line); border-radius: var(--r);
  overflow-x: auto;
}
.post pre .pre-head {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em;
  color: var(--text-faint); text-transform: uppercase;
  padding: 12px 18px; border-bottom: 1px solid var(--line);
}
.post pre code {
  display: block; padding: 18px; background: none; border: 0; border-radius: 0;
  font-size: 13.5px; line-height: 1.75; color: var(--text-dim); white-space: pre;
}
.post pre code .c { color: var(--text-faint); }       /* comment */
.post pre code .k { color: var(--accent); }            /* key / keyword */
.post pre code .s { color: #c3b56b; }                  /* string */

/* note / callout */
.post .callout {
  margin-top: 28px; max-width: var(--measure); padding: 20px 22px;
  background: var(--accent-soft); border: 1px solid rgba(77,159,255,0.22);
  border-left: 2px solid var(--accent); border-radius: 10px;
}
.post .callout p { margin: 0; font-family: var(--serif); color: var(--text); font-size: 17.5px; line-height: 1.55; max-width: none; }
.post .callout p + p { margin-top: 12px; }

/* tables */
.post .table-wrap { margin-top: 28px; max-width: var(--measure); overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); }
.post table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.post th, .post td { text-align: left; padding: 13px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
.post th {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-faint); font-weight: 500; background: var(--panel);
}
.post td { font-family: var(--serif); font-size: 15.5px; line-height: 1.5; color: var(--text-read); }
.post td:first-child { color: var(--text); font-weight: 500; white-space: nowrap; }
.post tr:last-child td { border-bottom: 0; }

/* diagram */
/* the diagram breaks out wider than the prose, centered on the column, so it stays
   readable without scrolling; fit-to-container (useMaxWidth) keeps it from overflowing */
.post figure {
  margin-top: 32px;
  width: min(960px, 94vw);
  max-width: none;
  margin-left: calc(50% - min(480px, 47vw));
}
.post .diagram {
  background: var(--bg-raise); border: 1px solid var(--line); border-radius: var(--r);
  padding: 26px 18px; overflow-x: auto;
}
.post .diagram .mermaid { text-align: center; }
.post figcaption {
  margin-top: 14px; font-family: var(--mono); font-size: 12px; color: var(--text-faint);
  letter-spacing: 0.03em; text-align: center;
}

.post .rule { margin-top: 56px; max-width: var(--measure); border: 0; border-top: 1px solid var(--line); }

/* end-of-post CTA */
.post-cta { border-top: 1px solid var(--line); }
.post-cta .wrap { max-width: 820px; padding-top: 56px; padding-bottom: 96px; }
.post-cta .eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-faint);
}
.post-cta h2 {
  margin-top: 14px; font-weight: 800; letter-spacing: -0.03em;
  font-size: clamp(26px, 3.4vw, 38px); line-height: 1.1; max-width: 14em;
  background: linear-gradient(180deg, #fff 62%, rgba(255,255,255,0.72));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.post-cta .links { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 600; padding: 11px 20px; border-radius: 999px;
  transition: transform .15s, box-shadow .15s, background .15s, border-color .15s;
}
.btn.primary { color: #0a0a09; background: var(--text); }
.btn.primary:hover { background: #fff; transform: translateY(-1px); box-shadow: 0 6px 28px rgba(255,255,255,0.2); }
.btn.ghost { color: var(--text); border: 1px solid var(--line-bright); }
.btn.ghost:hover { border-color: var(--text-dim); background: var(--panel); }

/* footer */
footer { border-top: 1px solid var(--line); }
footer .wrap {
  padding: 28px 32px 36px;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
  color: var(--text-faint);
}
footer a { color: var(--text-dim); }
footer a:hover { color: var(--text); }

.rv { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .bar { height: 60px; padding: 0 20px; }
  nav { gap: 2px; }
  nav a:not(.cta):not(.keep) { display: none; }
  .idx-hero { padding-top: 128px; }
  .post-hero { padding-top: 120px; }
  .post .lede { font-size: 20px; }
  .post p, .post li { font-size: 17px; }
  .post .body > p { text-align: left; }   /* ragged on narrow screens, where justify goes gappy */
}