:root {
  --ink: #17201c;
  --muted: #65706a;
  --green: #0a6a46;
  --green-soft: #eaf4ed;
  --paper: #fbfbf8;
  --line: #dedfd9;
  --serif: Charter, "Bitstream Charter", "Iowan Old Style", Georgia, serif;
  --sans: Inter, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { display: block; max-width: 100%; }
button { font: inherit; }
::selection { background: #bce7cc; }
.skip-link { position: fixed; top: -70px; left: 16px; z-index: 100; padding: 10px 14px; color: white; background: var(--ink); }
.skip-link:focus { top: 12px; }
.shell { width: min(1080px, calc(100% - 48px)); margin-inline: auto; }
.shell-wide { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.article-width { width: min(760px, calc(100% - 48px)); margin-inline: auto; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--paper) 94%, transparent); backdrop-filter: blur(14px); }
.header-inner { display: flex; width: min(1120px, calc(100% - 48px)); min-height: 64px; align-items: center; justify-content: space-between; margin-inline: auto; }
.publication { display: inline-flex; align-items: center; gap: 10px; font-family: var(--serif); font-size: 20px; font-weight: 700; letter-spacing: -.025em; text-decoration: none; }
.publication img { width: 28px; height: 28px; object-fit: contain; }
.nav-links, .article-actions { display: flex; align-items: center; gap: 26px; }
.nav-links a, .article-actions a { color: #4e5852; font-size: 12px; text-decoration: none; }
.nav-links a:hover, .article-actions a:hover { color: var(--green); }
.visit-link { font-weight: 600; }

/* Publication home */
.publication-intro { padding: 82px 0 42px; }
.publication-intro > div { display: flex; align-items: end; justify-content: space-between; gap: 48px; padding-bottom: 42px; border-bottom: 1px solid var(--ink); }
.publication-intro h1 { margin: 0; font-family: var(--serif); font-size: clamp(44px, 4.7vw, 56px); font-weight: 500; letter-spacing: -.045em; line-height: 1; }
.publication-intro p { max-width: 470px; margin: 0 0 5px; color: #4f5c55; font-family: var(--serif); font-size: 20px; line-height: 1.45; }
.section-label { margin: 0; color: var(--muted); font-size: 12px; }
.story-feed { padding-bottom: 110px; }
.story-feed > .section-label { padding: 2px 0 20px; }
.lead-story { display: grid; grid-template-columns: minmax(0, .95fr) minmax(380px, 1.05fr); gap: clamp(48px, 7vw, 82px); align-items: center; padding: 24px 0 68px; border-bottom: 1px solid var(--line); }
.story-meta { margin: 0 0 16px; color: var(--green); font-family: var(--serif); font-size: 13px; }
.lead-story h2 { margin: 0 0 20px; font-family: var(--serif); font-size: clamp(36px, 4vw, 52px); font-weight: 500; letter-spacing: -.043em; line-height: 1.04; text-wrap: balance; }
.lead-story h2 a { text-decoration: none; }
.lead-story h2 a:hover { color: var(--green); }
.lead-story-copy > p:not(.story-meta) { margin: 0; color: #506059; font-family: var(--serif); font-size: 18px; line-height: 1.58; }
.story-cover { overflow: hidden; background: #0a3a2b; }
.story-cover img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; transition: transform .45s cubic-bezier(.2,.7,.2,1); }
.story-cover:hover img { transform: scale(1.015); }
.story-byline { display: flex; gap: 11px; align-items: center; }
.story-byline img, .author-icon { width: 36px; height: 36px; flex: 0 0 36px; object-fit: contain; }
.story-byline > span { display: grid; gap: 3px; }
.story-byline strong { font-size: 12px; font-weight: 600; }
.story-byline small { color: var(--muted); font-size: 11px; }
.compact-byline { margin-top: 28px; }
.compact-byline img { width: 32px; height: 32px; flex-basis: 32px; }
.about-section { border-top: 1px solid var(--line); background: var(--green-soft); }
.about-inner { display: grid; grid-template-columns: .36fr 1fr; gap: 70px; padding-top: 84px; padding-bottom: 88px; }
.about-inner h2 { max-width: 760px; margin: 0; font-family: var(--serif); font-size: clamp(36px, 4.3vw, 56px); font-weight: 500; letter-spacing: -.04em; line-height: 1.03; }
.about-inner div p { max-width: 640px; margin: 26px 0 24px; color: #526058; font-family: var(--serif); font-size: 18px; line-height: 1.6; }
.about-inner a { color: var(--green); font-size: 12px; font-weight: 600; text-decoration: none; }
.site-footer { border-top: 1px solid var(--line); background: var(--paper); }
.footer-inner { display: flex; min-height: 88px; align-items: center; justify-content: space-between; color: var(--muted); font-size: 11px; }
.footer-inner .publication { color: var(--ink); font-size: 17px; }

/* Article */
.reading-progress { position: fixed; top: 0; right: 0; left: 0; z-index: 100; height: 2px; }
.reading-progress span { display: block; width: 100%; height: 100%; transform: scaleX(0); transform-origin: left; background: var(--green); }
.share-button { padding: 8px 14px; border: 1px solid #cfd2cd; border-radius: 999px; color: var(--ink); background: transparent; cursor: pointer; font-size: 11px; }
.share-button:hover { border-color: var(--green); color: var(--green); }
.article-hero { padding: 82px 0 56px; }
.article-label { margin: 0 0 22px; color: var(--green); font-family: var(--serif); font-size: 14px; }
.article-hero h1 { margin: 0 0 28px; font-family: var(--serif); font-size: clamp(47px, 6vw, 70px); font-weight: 500; letter-spacing: -.052em; line-height: 1.01; text-wrap: balance; }
.article-deck { margin: 0; color: #526059; font-family: var(--serif); font-size: 22px; line-height: 1.48; }
.article-meta { margin-top: 32px; }
.article-collaboration { margin-top: 8px; margin-bottom: 78px; }
.article-collaboration img { width: 100%; max-height: 680px; object-fit: cover; background: #0a3a2b; }
.article-collaboration figcaption, .article-image figcaption { margin-top: 10px; color: var(--muted); font-family: var(--serif); font-size: 12px; line-height: 1.5; }
.article-layout { width: min(720px, calc(100% - 48px)); margin-inline: auto; }
.article-body { min-width: 0; }
.article-body .lead { margin: 0 0 72px; color: #27352e; font-family: var(--serif); font-size: 27px; line-height: 1.52; }
.article-body section { margin-bottom: 78px; scroll-margin-top: 88px; }
.article-body h2 { margin: 0 0 26px; font-family: var(--serif); font-size: 38px; font-weight: 600; letter-spacing: -.035em; line-height: 1.08; text-wrap: balance; }
.article-body section > p { color: #303b35; font-family: var(--serif); font-size: 20px; line-height: 1.72; }
.article-body code { color: var(--green); font-family: var(--mono); font-size: 12px; }
.plain-note, .privacy-note { margin: 34px 0; padding: 20px 0 20px 23px; border-left: 3px solid #8fc8a5; }
.plain-note strong, .privacy-note strong { font-size: 12px; }
.plain-note p, .privacy-note p { margin: 7px 0 0; color: var(--muted); font-family: var(--serif); font-size: 16px; line-height: 1.58; }
.technical-flow { margin: 38px 0; border-top: 1px solid var(--line); }
.technical-flow > div { display: grid; grid-template-columns: 28px 1fr auto; gap: 18px; align-items: start; padding: 20px 0; border-bottom: 1px solid var(--line); }
.technical-flow > div > span { color: var(--green); font-family: var(--mono); font-size: 10px; }
.technical-flow strong { font-size: 13px; }
.technical-flow p { margin: 5px 0 0; color: var(--muted); font-family: var(--serif); font-size: 15px; line-height: 1.5; }
.technical-flow code { align-self: center; min-width: 105px; text-align: right; }
.article-image { margin: -10px 0 78px; }
.article-image img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin: 38px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.stat-grid div { display: flex; min-height: 145px; flex-direction: column; padding: 20px 18px 20px 0; }
.stat-grid div + div { padding-left: 18px; border-left: 1px solid var(--line); }
.stat-grid strong { color: var(--green); font-size: 36px; letter-spacing: -.05em; }
.stat-grid span { margin-top: 7px; font-size: 12px; font-weight: 600; line-height: 1.35; }
.stat-grid small { margin-top: auto; color: var(--muted); font-size: 10px; }
.article-body blockquote { margin: 44px 0; padding-left: 24px; border-left: 2px solid var(--green); color: #21513a; font-family: var(--serif); font-size: 28px; font-style: italic; line-height: 1.42; }
.commercial-callout { margin: 42px 0; padding: 30px 32px; border-top: 3px solid var(--green); background: var(--green-soft); }
.commercial-callout > p { margin: 0 0 15px; color: var(--green); font-family: var(--serif); font-size: 13px; }
.commercial-callout h3 { margin: 0 0 24px; font-family: var(--serif); font-size: 31px; font-weight: 600; letter-spacing: -.03em; line-height: 1.16; }
.commercial-callout span { display: block; padding-top: 17px; border-top: 1px solid #b9d5c3; color: #53665b; font-family: var(--serif); font-size: 14px; line-height: 1.55; }
.takeaway-list { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.takeaway-list li { display: grid; grid-template-columns: 38px 1fr; gap: 16px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.takeaway-list li > span { color: var(--green); font-family: var(--mono); font-size: 10px; }
.takeaway-list strong { font-size: 13px; }
.takeaway-list p { margin: 7px 0 0; color: var(--muted); font-family: var(--serif); font-size: 16px; line-height: 1.5; }
.methodology { padding: 25px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.methodology h2 { font-size: 20px; }
.methodology p { color: var(--muted) !important; font-size: 15px !important; line-height: 1.6 !important; }
.article-end { display: grid; grid-template-columns: auto 1fr; gap: 15px; margin: 82px 0; padding: 24px 0; border-top: 1px solid var(--line); }
.article-end strong { font-size: 12px; }
.article-end p { margin: 6px 0 0; color: var(--muted); font-family: var(--serif); font-size: 15px; line-height: 1.5; }

@media (max-width: 820px) {
  .publication-intro > div { display: block; }
  .publication-intro p { margin-top: 24px; }
  .lead-story { grid-template-columns: 1fr; }
  .story-cover { grid-row: 1; }
  .about-inner { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 620px) {
  .shell, .shell-wide, .article-width, .article-layout { width: calc(100% - 34px); }
  .header-inner { width: calc(100% - 30px); min-height: 60px; }
  .publication { font-size: 17px; }
  .publication img { width: 26px; height: 26px; }
  .nav-links { gap: 15px; }
  .nav-links a:not(.visit-link) { display: none; }
  .publication-intro { padding: 60px 0 32px; }
  .publication-intro > div { padding-bottom: 32px; }
  .publication-intro h1 { font-size: 43px; }
  .publication-intro p { font-size: 18px; }
  .lead-story { gap: 30px; padding-bottom: 48px; }
  .lead-story h2 { font-size: 38px; }
  .story-cover img { aspect-ratio: 16 / 10; }
  .story-feed { padding-bottom: 75px; }
  .about-inner { padding-top: 64px; padding-bottom: 68px; }
  .footer-inner { gap: 18px; }
  .article-actions { gap: 0; }
  .article-actions .share-button { display: none; }
  .article-hero { padding: 60px 0 42px; }
  .article-hero h1 { font-size: 45px; }
  .article-deck { font-size: 19px; }
  .article-collaboration { margin-bottom: 58px; }
  .article-collaboration img { aspect-ratio: 1 / 1; object-fit: cover; }
  .article-body .lead { margin-bottom: 58px; font-size: 24px; }
  .article-body section { margin-bottom: 62px; }
  .article-body h2 { font-size: 32px; }
  .article-body section > p { font-size: 18px; line-height: 1.7; }
  .technical-flow > div { grid-template-columns: 24px 1fr; }
  .technical-flow code { grid-column: 2; width: max-content; min-width: 0; text-align: left; }
  .stat-grid { grid-template-columns: 1fr; }
  .stat-grid div, .stat-grid div + div { min-height: 112px; padding: 20px 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .stat-grid div:last-child { border-bottom: 0; }
  .commercial-callout { padding: 26px 22px; }
  .commercial-callout h3 { font-size: 27px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* "Start for free" header button, same look as bottomlines.ai */
.nav-links a.header-cta, .article-actions a.header-cta { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 40px; padding: 9px 16px; border: 1px solid #c4ea9a; border-radius: 6px; color: #123322; background: #d2f5ac; font-size: 13px; font-weight: 600; white-space: nowrap; text-decoration: none; transition: background .2s, transform .2s; }
.nav-links a.header-cta:hover, .article-actions a.header-cta:hover { color: #123322; background: #e3ffca; transform: translateY(-1px); }
.article-actions { gap: 20px; }
@media (max-width: 620px) {
  .nav-links .visit-link { display: none; }
  .nav-links a.header-cta, .article-actions a.header-cta { min-height: 36px; gap: 10px; padding: 7px 12px; font-size: 12px; }
  .article-actions { gap: 14px; }
  .article-actions > a:not(.header-cta) { display: none; }
  .publication span { white-space: nowrap; }
}