/* blog.css — shared styles for /blog index + individual posts
   Inherits the Mercury palette from the main site. Used by:
   - blog/index.html
   - blog/*.html (individual posts)
*/

:root {
  --surface:      #FAFAF7;
  --surface-alt:  #F1EEE8;
  --ink:          #0A0A0B;
  --muted:        rgba(10, 10, 11, .55);
  --sub:          rgba(10, 10, 11, .4);
  --line:         rgba(10, 10, 11, .09);
  --line-strong:  rgba(10, 10, 11, .14);
  --accent:       #2D5BFF;
  --green:        #22c55e;
  --invert-ink:   #F4F3EF;

  --font-ui:      "Geist", system-ui, sans-serif;
  --font-display: "Geist", system-ui, sans-serif;
  --font-mono:    "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --font-read:    "Newsreader", Georgia, "Times New Roman", serif;

  --pad-x:        clamp(20px, 5vw, 56px);
  --maxw:         1200px;
  --maxw-read:    680px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; padding: 0; background: var(--surface); color: var(--ink);
  font-family: var(--font-ui); font-size: 16px; line-height: 1.55;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; cursor: pointer; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4, p { margin: 0; }
.mono { font-family: var(--font-mono); }
.tabular { font-variant-numeric: tabular-nums; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad-x); }
.read-col { max-width: var(--maxw-read); margin: 0 auto; padding: 0 var(--pad-x); }

/* ── Top nav (minimal) ─────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--surface) 90%, transparent);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px var(--pad-x); max-width: var(--maxw); margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand__mark {
  width: 22px; height: 22px; background: var(--ink); border-radius: 3px;
  position: relative; flex-shrink: 0;
}
.brand__mark::after {
  content: ""; position: absolute; inset: 4px; background: var(--accent);
  border-radius: 1.5px;
}
.brand__name { font-family: var(--font-display); font-weight: 600; font-size: 16px; letter-spacing: -0.3px; }
.brand__tag {
  font-family: var(--font-mono); font-size: 10px; color: var(--muted);
  letter-spacing: 1px; padding: 2px 7px; border: 1px solid var(--line);
  border-radius: 3px; margin-left: 4px;
}
.nav__links { display: flex; gap: 28px; }
.nav__links a { font-size: 13px; color: var(--muted); transition: color .15s; }
.nav__links a:hover, .nav__links a.active { color: var(--ink); }
.nav__cta { display: flex; gap: 10px; align-items: center; }

@media (max-width: 720px) {
  .brand__tag { display: none; }
  .nav__links { display: none; }
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 6px; border: 0;
  font-family: var(--font-ui); font-size: 13px; font-weight: 500;
  cursor: pointer; transition: transform .12s, background .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--ink); color: var(--surface); }
.btn--primary:hover { background: #1a1a1c; }
.btn--ghost { background: transparent; color: var(--ink); border: 1px solid var(--line-strong); }

/* ─────────────────────────────────────────────────────────
   BLOG INDEX
   ───────────────────────────────────────────────────────── */
.blog-hero { padding: clamp(60px, 9vw, 120px) 0 clamp(40px, 6vw, 60px); border-bottom: 1px solid var(--line); }
.blog-hero h1 {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(40px, 6.5vw, 80px); line-height: 0.98;
  letter-spacing: -0.04em; text-wrap: balance; margin: 0;
  max-width: 14ch;
}
.blog-hero .kicker {
  font-family: var(--font-mono); font-size: 12px; color: var(--accent);
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 20px;
}
.blog-hero p { font-size: clamp(15px, 1.4vw, 18px); color: var(--muted); margin-top: 24px; max-width: 560px; line-height: 1.55; }

.blog-filter { display: flex; gap: 10px; flex-wrap: wrap; margin: 36px 0; align-items: center; }
.blog-filter__label { font-family: var(--font-mono); font-size: 11px; color: var(--muted); letter-spacing: 1px; text-transform: uppercase; margin-right: 4px; }
.chip {
  padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line-strong);
  background: transparent; font-size: 12px; font-weight: 500; transition: all .15s;
}
.chip:hover { border-color: var(--ink); }
.chip.active { background: var(--ink); color: var(--surface); border-color: var(--ink); }

.posts { padding: clamp(40px, 6vw, 80px) 0 120px; }
.posts__featured {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: end;
  padding-bottom: 56px; border-bottom: 1px solid var(--line); margin-bottom: 48px;
}
@media (max-width: 900px) { .posts__featured { grid-template-columns: 1fr; gap: 24px; } }
.posts__featured .meta { font-family: var(--font-mono); font-size: 11px; color: var(--accent); letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 16px; }
.posts__featured h2 { font-family: var(--font-display); font-size: clamp(32px, 4.5vw, 52px); font-weight: 500; letter-spacing: -1.4px; line-height: 1.02; text-wrap: balance; }
.posts__featured .excerpt { font-size: 16px; color: var(--muted); line-height: 1.6; margin-top: 18px; max-width: 540px; }
.posts__featured .right { font-family: var(--font-mono); font-size: 13px; color: var(--muted); display: grid; gap: 8px; }

.posts__list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px 56px; }
@media (max-width: 800px) { .posts__list { grid-template-columns: 1fr; gap: 32px; } }

.post-card { padding: 28px 0; border-top: 1px solid var(--line); display: grid; gap: 12px; cursor: pointer; }
.post-card:hover h3 { color: var(--accent); }
.post-card .meta {
  display: flex; gap: 14px; font-family: var(--font-mono); font-size: 11px;
  color: var(--muted); letter-spacing: 0.5px; text-transform: uppercase;
}
.post-card .meta .tag { color: var(--accent); }
.post-card h3 { font-family: var(--font-display); font-size: 24px; font-weight: 500; letter-spacing: -0.6px; line-height: 1.15; transition: color .15s; text-wrap: balance; }
.post-card .excerpt { font-size: 14px; color: var(--muted); line-height: 1.6; }
.post-card .more { font-family: var(--font-mono); font-size: 11px; color: var(--accent); letter-spacing: 1px; text-transform: uppercase; margin-top: 6px; }

/* ─────────────────────────────────────────────────────────
   POST PAGE
   ───────────────────────────────────────────────────────── */
.post-header { padding: clamp(50px, 8vw, 90px) 0 48px; border-bottom: 1px solid var(--line); }
.post-header .read-col { display: grid; gap: 24px; }
.post-header .back {
  font-family: var(--font-mono); font-size: 11px; color: var(--muted); letter-spacing: 1px;
  text-transform: uppercase; display: inline-flex; align-items: center; gap: 6px;
  width: max-content;
}
.post-header .back:hover { color: var(--ink); }
.post-header .meta {
  display: flex; gap: 20px; font-family: var(--font-mono); font-size: 11px;
  color: var(--muted); letter-spacing: 1px; text-transform: uppercase; flex-wrap: wrap;
}
.post-header .meta .tag { color: var(--accent); }
.post-header h1 {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(34px, 5.5vw, 60px); line-height: 1.02;
  letter-spacing: -0.035em; text-wrap: balance;
}
.post-header .dek {
  font-family: var(--font-read); font-size: clamp(17px, 1.6vw, 22px);
  line-height: 1.55; color: var(--muted); font-weight: 400;
  font-style: italic; max-width: 38em;
}
.post-header .author {
  display: flex; align-items: center; gap: 12px; padding-top: 16px;
  border-top: 1px solid var(--line); margin-top: 8px;
}
.post-header .author img { width: 40px; height: 40px; border-radius: 999px; object-fit: cover; }
.post-header .author .mono-av {
  width: 40px; height: 40px; border-radius: 999px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 13px; font-weight: 500;
  letter-spacing: -0.5px; color: rgba(0,0,0,.8); flex-shrink: 0;
}
.post-header .author .n { font-size: 14px; font-weight: 500; }
.post-header .author .r { font-family: var(--font-mono); font-size: 11px; color: var(--muted); letter-spacing: 0.5px; }

/* Body */
.post-body { padding: clamp(40px, 6vw, 64px) 0 80px; }
.post-body .read-col { font-family: var(--font-read); font-size: 19px; line-height: 1.7; color: var(--ink); }
.post-body p { margin: 0 0 1.2em; }
.post-body p:first-of-type::first-letter {
  font-family: var(--font-display); font-size: 4.2em; line-height: 0.9;
  float: left; padding-right: 12px; padding-top: 6px; font-weight: 500;
  color: var(--accent);
}
.post-body h2 {
  font-family: var(--font-display); font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 500; letter-spacing: -0.6px; line-height: 1.15;
  margin: 2em 0 0.6em; text-wrap: balance;
}
.post-body h3 {
  font-family: var(--font-display); font-size: clamp(18px, 2vw, 22px);
  font-weight: 500; letter-spacing: -0.3px; margin: 1.6em 0 0.4em;
}
.post-body a { color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.post-body a:hover { border-bottom-color: var(--accent); }
.post-body ul, .post-body ol { padding-left: 1.2em; margin: 0 0 1.2em; }
.post-body li { margin-bottom: 0.4em; }
.post-body strong { font-weight: 600; }
.post-body em { font-style: italic; }
.post-body code {
  font-family: var(--font-mono); font-size: 0.82em;
  background: var(--surface-alt); padding: 2px 6px; border-radius: 3px;
}
.post-body blockquote {
  margin: 1.6em 0; padding: 0 0 0 24px;
  border-left: 3px solid var(--accent);
  font-size: 1.05em; color: var(--ink); font-style: italic;
}
.post-body hr {
  border: 0; border-top: 1px solid var(--line); margin: 3em auto;
  width: 30%; max-width: 120px;
}

/* Callout box */
.callout {
  margin: 2em -8px; padding: 22px 24px; background: var(--surface-alt);
  border-radius: 6px; border-left: 3px solid var(--accent);
  font-family: var(--font-ui); font-size: 15px; line-height: 1.55; font-style: normal;
}
.callout .label {
  font-family: var(--font-mono); font-size: 11px; color: var(--accent);
  letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 8px; display: block;
}
.callout p { margin: 0; }
.callout p + p { margin-top: 0.7em; }

/* Stat row */
.statrow {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin: 2em 0; padding: 24px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  font-family: var(--font-ui); font-style: normal;
}
.statrow .n { font-family: var(--font-mono); font-size: 28px; font-weight: 500; letter-spacing: -1px; }
.statrow .l { font-family: var(--font-mono); font-size: 11px; color: var(--muted); letter-spacing: 0.5px; text-transform: uppercase; margin-top: 4px; }
@media (max-width: 600px) { .statrow { grid-template-columns: 1fr; gap: 16px; } }

/* Table */
.table-wrap { margin: 1.6em -8px; overflow-x: auto; }
.post-body table {
  width: 100%; border-collapse: collapse; font-family: var(--font-ui); font-size: 14px; font-style: normal;
}
.post-body th, .post-body td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.post-body th { font-family: var(--font-mono); font-size: 11px; color: var(--muted); letter-spacing: 1px; text-transform: uppercase; font-weight: 500; }
.post-body td.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* Code block */
.post-body pre {
  margin: 1.5em -8px; padding: 18px 22px; background: #0a0a0c; color: #e9e9e6;
  border-radius: 6px; overflow-x: auto; font-size: 13px; line-height: 1.55;
}
.post-body pre code { background: transparent; padding: 0; color: inherit; }

/* End-of-post CTA */
.post-cta {
  margin-top: 64px; padding: 36px; background: var(--ink); color: var(--surface);
  border-radius: 8px; display: grid; grid-template-columns: 1.6fr auto; gap: 24px; align-items: center;
}
@media (max-width: 700px) { .post-cta { grid-template-columns: 1fr; } }
.post-cta h3 { font-family: var(--font-display); font-size: 26px; font-weight: 500; letter-spacing: -0.5px; }
.post-cta p { font-size: 14px; color: rgba(255,255,255,.6); margin-top: 6px; }
.post-cta .btn { background: var(--accent); color: #fff; padding: 14px 22px; font-size: 14px; }

/* Related posts */
.related { padding: 60px 0 100px; border-top: 1px solid var(--line); }
.related h4 { font-family: var(--font-mono); font-size: 11px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); margin-bottom: 28px; }
.related__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
@media (max-width: 800px) { .related__grid { grid-template-columns: 1fr; } }
.related .card { display: grid; gap: 8px; padding-top: 16px; border-top: 1px solid var(--line-strong); }
.related .card .tag { font-family: var(--font-mono); font-size: 10px; color: var(--accent); letter-spacing: 1.5px; text-transform: uppercase; }
.related .card h5 { font-family: var(--font-display); font-size: 18px; font-weight: 500; line-height: 1.25; letter-spacing: -0.3px; text-wrap: balance; }
.related .card:hover h5 { color: var(--accent); }

/* Footer (slim, matches main site) */
.footer {
  background: var(--ink); color: var(--invert-ink); padding: 40px 0 28px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.5px;
}
.footer__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad-x);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: rgba(255,255,255,.5);
}
.footer a { color: rgba(255,255,255,.85); }
.footer a:hover { color: #fff; }