:root {
  --ink: #24282a;
  --ink-soft: #55605f;
  --paper: #f5f7f7;
  --panel: #ffffff;
  --line: #d9e0e0;
  --line-hard: #b9c4c4;
  --orange: #ea7024;
  --orange-ink: #c95a14;
  --teal: #5396a5;
  --teal-soft: rgba(83, 150, 165, 0.12);
  --band: #1b2023;
  --band-ink: #e9edee;
  --band-soft: #9fabab;
  --logo-plate: transparent;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e9edee;
    --ink-soft: #98a4a4;
    --paper: #15191b;
    --panel: #1d2225;
    --line: #2c3336;
    --line-hard: #3b4448;
    --orange: #f07f36;
    --orange-ink: #f28a46;
    --teal: #6cabb9;
    --teal-soft: rgba(108, 171, 185, 0.14);
    --band: #101416;
    --band-ink: #e9edee;
    --band-soft: #8b9797;
    --logo-plate: #ffffff;
  }
}
:root[data-theme="dark"] {
  --ink: #e9edee;
  --ink-soft: #98a4a4;
  --paper: #15191b;
  --panel: #1d2225;
  --line: #2c3336;
  --line-hard: #3b4448;
  --orange: #f07f36;
  --orange-ink: #f28a46;
  --teal: #6cabb9;
  --teal-soft: rgba(108, 171, 185, 0.14);
  --band: #101416;
  --band-ink: #e9edee;
  --band-soft: #8b9797;
  --logo-plate: #ffffff;
}
:root[data-theme="light"] {
  --ink: #24282a;
  --ink-soft: #55605f;
  --paper: #f5f7f7;
  --panel: #ffffff;
  --line: #d9e0e0;
  --line-hard: #b9c4c4;
  --orange: #ea7024;
  --orange-ink: #c95a14;
  --teal: #5396a5;
  --teal-soft: rgba(83, 150, 165, 0.12);
  --band: #1b2023;
  --band-ink: #e9edee;
  --band-soft: #9fabab;
  --logo-plate: transparent;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 84px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.disp {
  font-family: "Avenir Next Condensed", "HelveticaNeue-CondensedBold", "Arial Narrow", "Roboto Condensed", "Liberation Sans Narrow", sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.02;
  text-wrap: balance;
}
.mono {
  font-family: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}
img { max-width: 100%; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* ---------- header ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line-hard);
}
.nav {
  display: flex; align-items: center; gap: 28px;
  height: 64px;
}
.nav .logo img {
  height: 30px; width: auto; display: block;
  background: var(--logo-plate, transparent);
  padding: 3px 7px;
  box-sizing: content-box;
}
.nav nav { margin-left: auto; display: flex; gap: 24px; align-items: center; }
.nav nav a { color: var(--ink-soft); font-size: 14px; font-weight: 600; }
.nav nav a:hover { color: var(--ink); text-decoration: none; }
.nav nav a.current { color: var(--orange-ink); }
@media (max-width: 720px) { .nav nav a:not(.btn) { display: none; } }

.btn {
  display: inline-block;
  background: var(--orange);
  color: #fff !important;
  font-weight: 700;
  font-size: 14px;
  padding: 10px 20px;
  border: none;
  cursor: pointer;
}
.btn:hover { text-decoration: none; filter: brightness(0.94); }
.btn.ghost {
  background: transparent;
  color: var(--ink) !important;
  box-shadow: inset 0 0 0 1px var(--line-hard);
}
.btn.ghost:hover { box-shadow: inset 0 0 0 1px var(--ink-soft); filter: none; }

.zone { border-bottom: 1px solid var(--line-hard); position: relative; }
.zone > .wrap { padding-top: 64px; padding-bottom: 72px; }
.zone-tag {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--teal);
  margin-bottom: 22px;
}
.zone-tag::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--orange);
}
.zone h1, .zone h2 { font-size: clamp(32px, 4.5vw, 46px); margin: 0 0 14px; }
.zone .lede { max-width: 68ch; color: var(--ink-soft); font-size: 18px; margin: 0 0 8px; }

.chip {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  padding: 8px 14px;
  border: 1px solid var(--line-hard);
  background: var(--panel);
  color: var(--ink);
  display: inline-block;
}

/* ---------- CTA band + footer (committed dark, both themes) ---------- */
.band {
  background: var(--band);
  color: var(--band-ink);
}
.band .wrap { padding: 76px 28px; display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; }
@media (max-width: 720px) { .band .wrap { grid-template-columns: 1fr; } }
.band h2 { font-size: clamp(34px, 5vw, 54px); margin: 0 0 12px; }
.band p { color: var(--band-soft); margin: 0; max-width: 52ch; }
.band .btn { padding: 16px 30px; font-size: 15px; white-space: nowrap; }
footer { background: var(--band); border-top: 1px solid #2c3336; }
footer .wrap {
  padding: 30px 28px;
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
footer img {
  height: 24px; width: auto; display: block;
  background: #ffffff;
  padding: 3px 7px;
  box-sizing: content-box;
}
footer .mono { color: var(--band-soft); margin-left: auto; }
footer nav { display: flex; gap: 18px; }
footer nav a { color: var(--band-soft); font-size: 13px; font-weight: 600; }
footer nav a:hover { color: var(--band-ink); }

/* ---------- blog index ---------- */
.post-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: 1px solid var(--line-hard);
  background: var(--panel);
}
.post-card {
  padding: 30px 32px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: start;
}
.post-card:first-child { border-top: none; }
@media (max-width: 640px) { .post-card { grid-template-columns: 1fr; } }
.post-card .meta {
  display: flex; gap: 14px; align-items: center;
  color: var(--ink-soft); margin-bottom: 10px;
}
.post-card h2 { font-size: 26px; margin: 0 0 10px; }
.post-card h2 a { color: var(--ink); }
.post-card h2 a:hover { color: var(--teal); text-decoration: none; }
.post-card p.dek { margin: 0; color: var(--ink-soft); font-size: 15px; max-width: 68ch; }
.post-card .tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.post-card .tags .chip { font-size: 11px; padding: 5px 10px; }
.post-card .readmore { white-space: nowrap; font-size: 14px; font-weight: 700; align-self: center; }

/* ---------- article page ---------- */
.article-head { padding-bottom: 40px; }
.article-head .meta {
  display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
  color: var(--ink-soft); margin: 18px 0 22px;
}
.article-head .meta .chip { font-size: 11px; padding: 5px 10px; }
.article-head h1 { font-size: clamp(34px, 5.5vw, 56px); margin: 0 0 18px; }
.article-head p.dek { font-size: 19px; color: var(--ink-soft); max-width: 70ch; margin: 0; }

.article-body { max-width: 760px; }
.article-body h2 {
  font-size: 27px;
  margin: 52px 0 16px;
  padding-top: 4px;
}
.article-body h2:first-child { margin-top: 0; }
.article-body h3 {
  font-size: 20px;
  margin: 34px 0 12px;
  color: var(--ink);
}
.article-body p { margin: 0 0 20px; font-size: 17px; }
.article-body ul, .article-body ol { margin: 0 0 20px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; font-size: 17px; }
.article-body strong { font-weight: 700; }
.article-body a { text-underline-offset: 2px; }
.article-body blockquote {
  margin: 28px 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--orange);
  color: var(--ink-soft);
  font-size: 17px;
}
.article-body code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  background: var(--teal-soft);
  padding: 2px 6px;
}
.article-body pre {
  background: var(--band);
  color: var(--band-ink);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 24px;
  font-size: 13.5px;
  line-height: 1.55;
}
.article-body pre code { background: none; padding: 0; color: inherit; }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 28px;
  font-size: 15px;
}
.article-body th, .article-body td {
  border: 1px solid var(--line-hard);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.article-body th { background: var(--panel); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-soft); }
.article-body hr { border: none; border-top: 1px solid var(--line-hard); margin: 40px 0; }

.toc {
  border: 1px solid var(--line-hard);
  background: var(--panel);
  padding: 22px 26px;
  margin: 0 0 44px;
  max-width: 760px;
}
.toc .mono { color: var(--teal); display: block; margin-bottom: 12px; }
.toc ol { margin: 0; padding-left: 20px; columns: 1; }
.toc li { font-size: 14px; margin-bottom: 8px; }
@media (min-width: 640px) { .toc ol { columns: 2; column-gap: 24px; } }

.author-box {
  max-width: 760px;
  margin-top: 56px;
  padding: 24px 26px;
  border-top: 3px solid var(--teal);
  background: var(--panel);
  display: flex; gap: 16px; align-items: flex-start;
}
.author-box p { margin: 0; font-size: 14px; color: var(--ink-soft); }
.author-box strong { color: var(--ink); }

.related {
  max-width: 760px;
  margin-top: 48px;
}
.related .mono { color: var(--teal); display: block; margin-bottom: 14px; }
.related ul { list-style: none; margin: 0; padding: 0; }
.related li { padding: 12px 0; border-top: 1px solid var(--line); }
.related li:first-child { border-top: none; }
.related a { font-weight: 600; color: var(--ink); }
.related a:hover { color: var(--teal); }

.back-link { display: inline-block; margin-bottom: 8px; font-size: 14px; font-weight: 600; }