:root {
  --ink: #10201e;
  --ink-soft: #4e605c;
  --paper: #f3f5f1;
  --paper-deep: #e9ede7;
  --surface: #ffffff;
  --night: #0b1514;
  --night-line: #263936;
  --mint: #5ce1c3;
  --mint-deep: #148d78;
  --line: #ced6d0;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --shell: min(1180px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--mint-deep);
  outline-offset: 3px;
}
.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 9px 13px;
  border-radius: 7px;
  background: var(--night);
  color: white;
  text-decoration: none;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(206, 214, 208, .85);
  background: rgba(243, 245, 241, .9);
  backdrop-filter: blur(18px);
}
.nav-shell {
  width: var(--shell);
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 42px;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -.03em;
  text-decoration: none;
}
.wordmark-icon {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: var(--ink);
  color: var(--mint);
}
.wordmark-icon svg { width: 23px; height: 23px; }
.top-links { display: flex; gap: 28px; }
.top-links a {
  color: var(--ink-soft);
  font-size: .88rem;
  font-weight: 500;
  text-decoration: none;
}
.top-links a:hover, .top-links a.active { color: var(--ink); }
.top-links a.active::after {
  content: "";
  display: block;
  height: 2px;
  margin-top: 4px;
  background: var(--mint-deep);
}
.nav-cta {
  min-height: 39px;
  margin-left: auto;
  padding: 0 17px;
  display: inline-flex;
  align-items: center;
  border-radius: 9px;
  background: var(--ink);
  color: white;
  font-size: .85rem;
  font-weight: 600;
  text-decoration: none;
}

.blog-shell {
  width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 260px minmax(0, 780px);
  gap: 78px;
  align-items: start;
  justify-content: center;
}
.series-nav {
  position: sticky;
  top: 108px;
  padding: 54px 0 80px;
}
.series-heading { margin-bottom: 25px; }
.series-heading > span {
  display: block;
  margin-bottom: 8px;
  color: var(--mint-deep);
  font-family: var(--mono);
  font-size: .62rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.series-heading strong {
  font-size: 1.25rem;
  line-height: 1.15;
  letter-spacing: -.025em;
}
.series-index {
  padding: 10px 0;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: .76rem;
  font-weight: 600;
  text-decoration: none;
}
.series-index span { color: var(--mint-deep); }
.series-nav nav { margin-top: 14px; }
.series-nav nav a {
  padding: 9px 10px;
  display: grid;
  grid-template-columns: 27px 1fr;
  gap: 7px;
  border-left: 2px solid transparent;
  color: #667671;
  font-size: .76rem;
  line-height: 1.35;
  text-decoration: none;
  transition: color .15s ease, background .15s ease, border-color .15s ease;
}
.series-nav nav a span {
  color: #9aa7a3;
  font-family: var(--mono);
  font-size: .58rem;
  padding-top: 2px;
}
.series-nav nav a:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, .48);
}
.series-nav nav a.active {
  border-left-color: var(--mint-deep);
  background: rgba(255, 255, 255, .72);
  color: var(--ink);
  font-weight: 600;
}
.series-nav nav a.active span { color: var(--mint-deep); }

.blog-content {
  min-width: 0;
  padding: 72px 0 110px;
}
.article-meta {
  margin-bottom: 28px;
  display: flex;
  gap: 18px;
  color: #788783;
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.article-meta span:first-child { color: var(--mint-deep); }
.guide-start {
  margin: 0 0 34px;
  padding: 16px 18px;
  border: 1px solid #b8d8cf;
  border-radius: 10px;
  background: #ebf6f2;
  color: #30534c;
  font-size: .9rem;
  line-height: 1.55;
}
.guide-start strong { color: var(--ink); }
.guide-start code { font-family: var(--mono); font-size: .86em; }
.guide-start a { color: #087966; text-underline-offset: 3px; }
.index-hero .guide-start + .guide-start { margin-top: -18px; }

.blog-content h1 {
  margin: 0 0 34px;
  max-width: 14ch;
  font-size: clamp(2.8rem, 5.3vw, 4.75rem);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -.058em;
  text-wrap: balance;
}
.blog-content h2 {
  margin: 70px 0 22px;
  padding-top: 8px;
  font-size: 1.75rem;
  line-height: 1.2;
  letter-spacing: -.035em;
}
.blog-content h2::before {
  content: "//";
  margin-right: 10px;
  color: var(--mint-deep);
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: 0;
  vertical-align: middle;
}
.blog-content h3 {
  margin: 42px 0 14px;
  font-size: 1.18rem;
  line-height: 1.25;
  letter-spacing: -.02em;
}
.blog-content p,
.blog-content li {
  color: var(--ink-soft);
  font-size: 1rem;
}
.blog-content p { margin: 0 0 20px; }
.blog-content > h1 + h2 {
  margin-top: 0;
  padding: 28px 0 0;
  border-top: 1px solid var(--line);
  color: var(--mint-deep);
  font-family: var(--mono);
  font-size: .71rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.blog-content > h1 + h2::before { display: none; }
.blog-content > h1 + h2 + p {
  color: #334743;
  font-size: 1.16rem;
  line-height: 1.72;
}
.blog-content strong { color: var(--ink); }
.blog-content a { color: #087966; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.blog-content a:hover { color: var(--ink); }
.blog-content ul, .blog-content ol { margin: 0 0 24px; padding-left: 24px; }
.blog-content li { margin-bottom: 8px; padding-left: 4px; }
.blog-content li::marker { color: var(--mint-deep); }

.blog-content code {
  font-family: var(--mono);
  font-size: .86em;
}
.blog-content :not(pre) > code {
  padding: .12em .38em;
  border: 1px solid #d1d9d3;
  border-radius: 5px;
  background: var(--paper-deep);
  color: #245049;
}
.blog-content pre {
  position: relative;
  margin: 28px 0;
  padding: 23px 25px;
  border: 1px solid var(--night-line);
  border-radius: 13px;
  background: var(--night);
  color: #dce7e3;
  box-shadow: 0 18px 40px rgba(18, 36, 32, .11);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: .79rem;
  line-height: 1.75;
}
.blog-content pre code { color: inherit; white-space: pre; }

.blog-content table {
  width: 100%;
  margin: 28px 0;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
  font-size: .88rem;
  overflow: hidden;
}
.blog-content th, .blog-content td {
  padding: 12px 14px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.blog-content tr:last-child td { border-bottom: 0; }
.blog-content th:last-child, .blog-content td:last-child { border-right: 0; }
.blog-content th {
  background: var(--paper-deep);
  color: #64736f;
  font-family: var(--mono);
  font-size: .67rem;
  font-weight: 500;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.blog-content blockquote {
  margin: 30px 0;
  padding: 20px 23px;
  border: 1px solid #b8d8cf;
  border-left: 4px solid var(--mint-deep);
  border-radius: 0 10px 10px 0;
  background: #ebf6f2;
}
.blog-content blockquote p { margin: 0; color: #30534c; }
.blog-content hr {
  margin: 60px 0 0;
  border: 0;
  border-top: 1px solid var(--line);
}
.blog-content img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.post-nav {
  margin-top: 90px;
  padding-top: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  border-top: 1px solid var(--line);
}
.post-nav a {
  min-height: 115px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(255, 255, 255, .58);
  color: var(--ink);
  text-decoration: none;
}
.post-nav a:hover { border-color: var(--mint-deep); }
.post-nav .next { text-align: right; grid-column: 2; }
.post-nav span { color: var(--mint-deep); font-family: var(--mono); font-size: .62rem; text-transform: uppercase; }
.post-nav strong { font-size: .86rem; line-height: 1.35; }

.blog-index .blog-shell { grid-template-columns: 1fr; display: block; }
.blog-index .series-nav { display: none; }
.blog-index .blog-content { max-width: none; padding-top: 90px; }
.index-hero {
  max-width: 830px;
  margin-bottom: 64px;
}
.eyebrow {
  margin: 0 0 16px;
  color: var(--mint-deep);
  font-family: var(--mono);
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.eyebrow::before { content: "//"; margin-right: 7px; color: #91a39e; }
.index-hero h1 {
  max-width: 13ch;
  margin-bottom: 25px;
}
.index-hero > p:last-child {
  max-width: 650px;
  color: var(--ink-soft);
  font-size: 1.08rem;
}
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.blog-card {
  min-height: 300px;
  padding: 25px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(255, 255, 255, .62);
  color: var(--ink);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.blog-card:nth-child(1),
.blog-card:nth-child(6) { background: #eef4ff; border-color: #cbd8ec; }
.blog-card:nth-child(2),
.blog-card:nth-child(7) { background: #f2f6e8; border-color: #d3ddbd; }
.blog-card:hover {
  z-index: 1;
  border-color: var(--mint-deep);
  box-shadow: 0 18px 40px rgba(18, 36, 32, .09);
  transform: translateY(-4px);
}
.card-meta {
  margin-bottom: 52px;
  display: flex;
  justify-content: space-between;
  color: #71807c;
  font-family: var(--mono);
  font-size: .61rem;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.card-meta span:first-child { color: var(--mint-deep); }
.blog-card > strong {
  display: block;
  margin-bottom: 12px;
  font-size: 1.4rem;
  line-height: 1.18;
  letter-spacing: -.035em;
}
.blog-card > p {
  margin: 0 0 25px;
  color: var(--ink-soft);
  font-size: .86rem;
  line-height: 1.55;
}
.blog-card > p code {
  font-family: var(--mono);
  font-size: .82em;
}
.blog-card > p a { text-decoration: none; }
.card-arrow {
  margin-top: auto;
  color: var(--ink);
  font-size: .78rem;
  font-weight: 600;
}

.blog-footer {
  min-height: 130px;
  padding: 30px max(24px, calc((100vw - 1180px) / 2));
  display: flex;
  align-items: center;
  gap: 35px;
  border-top: 1px solid var(--night-line);
  background: var(--night);
  color: #627772;
  font-size: .72rem;
}
.blog-footer .wordmark { color: white; }
.blog-footer .wordmark-icon { background: var(--mint); color: var(--night); }
.blog-footer > span:nth-child(2) { margin-left: auto; }

@media (max-width: 940px) {
  .blog-shell { grid-template-columns: 210px minmax(0, 1fr); gap: 42px; }
  .blog-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  :root { --shell: min(100% - 32px, 1180px); }
  .nav-shell { height: 64px; }
  .top-links {
    margin-left: auto;
    gap: 14px;
    overflow-x: auto;
  }
  .top-links a { flex: 0 0 auto; font-size: .76rem; }
  .nav-cta { display: none; }
  .blog-shell { display: block; }
  .series-nav {
    position: static;
    padding: 32px 0 0;
  }
  .series-heading, .series-nav nav { display: none; }
  .series-index { width: 100%; }
  .blog-content { padding-top: 45px; }
  .blog-content h1 { font-size: clamp(2.5rem, 13vw, 4rem); }
  .blog-content h2 { margin-top: 55px; }
  .blog-grid { grid-template-columns: 1fr; }
  .blog-card { min-height: 270px; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav .next { grid-column: 1; }
  .blog-footer { align-items: flex-start; flex-direction: column; gap: 14px; }
  .blog-footer > span:nth-child(2) { margin-left: 0; }
}
@media (max-width: 500px) {
  .nav-shell { gap: 18px; }
  .wordmark > span:last-child { display: none; }
  .article-meta { display: grid; gap: 3px; }
  .blog-content pre { margin-left: -8px; margin-right: -8px; padding: 18px; font-size: .7rem; }
  .blog-content table { display: block; overflow-x: auto; }
  .card-meta { margin-bottom: 38px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}