:root {
  color-scheme: light;
  --ink: #171717;
  --muted: #686868;
  --faint: #919191;
  --paper: #fbfaf7;
  --surface: rgba(255, 255, 255, 0.78);
  --line: #e5e2dc;
  --accent: #e74735;
  --accent-soft: #fff0ec;
  --blue: #315cde;
  --green: #176b52;
  --serif: "Iowan Old Style", "Songti SC", "Noto Serif CJK SC", Georgia, serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 87% 2%, rgba(231, 71, 53, 0.08), transparent 24rem),
    var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(49, 92, 222, 0.3);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(229, 226, 220, 0.85);
  background: rgba(251, 250, 247, 0.88);
  backdrop-filter: blur(16px);
}

.nav {
  width: min(1160px, calc(100% - 40px));
  height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 9px;
  color: #fff;
  background: var(--ink);
  font: 700 13px/1 var(--mono);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a:hover { color: var(--ink); }

.page-shell {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 760px) minmax(240px, 1fr);
  gap: 72px;
  align-items: end;
  padding: 96px 0 72px;
}

.eyebrow,
.kicker {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  max-width: 820px;
  margin-bottom: 24px;
  font-family: var(--serif);
  font-size: clamp(46px, 6.8vw, 82px);
  font-weight: 650;
  line-height: 1.04;
  letter-spacing: -0.055em;
}

.hero-copy {
  max-width: 690px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.7;
}

.hero-aside {
  padding: 22px 0 5px 24px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.hero-aside strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 15px;
}

.section {
  padding: 70px 0;
  border-top: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 40px;
  margin-bottom: 38px;
}

.section-label {
  color: var(--muted);
  font: 650 12px/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section h2 {
  max-width: 710px;
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 630;
  line-height: 1.16;
  letter-spacing: -0.035em;
}

.featured-card {
  display: grid;
  grid-template-columns: 1fr 320px;
  min-height: 360px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: 0 24px 60px rgba(40, 35, 30, 0.06);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.featured-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 30px 70px rgba(40, 35, 30, 0.1);
}

.featured-copy { padding: clamp(30px, 5vw, 58px); }

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-size: 12px;
  font-weight: 650;
}

.badge.live {
  border-color: #cce5d8;
  color: var(--green);
  background: #eef9f3;
}

.featured-card h3 {
  max-width: 650px;
  margin-bottom: 18px;
  font-family: var(--serif);
  font-size: clamp(27px, 3.8vw, 44px);
  font-weight: 620;
  line-height: 1.18;
  letter-spacing: -0.03em;
}

.featured-card p {
  max-width: 640px;
  color: var(--muted);
  font-size: 17px;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  color: var(--accent);
  font-weight: 720;
}

.read-more span { transition: transform 160ms ease; }
.featured-card:hover .read-more span { transform: translateX(4px); }

.featured-visual {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  color: #fff;
  background: #1a1a1a;
}

.featured-visual::before,
.featured-visual::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  filter: blur(2px);
}

.featured-visual::before {
  width: 310px;
  height: 310px;
  top: -75px;
  right: -110px;
  background: var(--accent);
}

.featured-visual::after {
  width: 180px;
  height: 180px;
  bottom: -55px;
  left: -65px;
  background: var(--blue);
}

.visual-code {
  position: relative;
  z-index: 1;
  width: 210px;
  padding: 24px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 18px;
  background: rgba(20, 20, 20, 0.72);
  box-shadow: 0 28px 60px rgba(0,0,0,.35);
  backdrop-filter: blur(18px);
  font: 13px/1.75 var(--mono);
}

.visual-code b { color: #ff8a78; }
.visual-code i { color: #96afff; font-style: normal; }

.topic-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
}

.topic-card {
  grid-column: span 2;
  min-height: 218px;
  padding: 27px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.52);
  transition: background 160ms ease, border-color 160ms ease;
}

.topic-card:nth-child(4), .topic-card:nth-child(5) { grid-column: span 3; }
.topic-card:hover { border-color: #cbc6be; background: #fff; }

.topic-number {
  display: block;
  margin-bottom: 38px;
  color: var(--accent);
  font: 620 12px/1 var(--mono);
}

.topic-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.topic-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.roadmap {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: maturity;
}

.roadmap li {
  position: relative;
  padding: 50px 22px 0 0;
  color: var(--muted);
  font-size: 13px;
  border-top: 2px solid var(--line);
  counter-increment: maturity;
}

.roadmap li::before {
  content: counter(maturity);
  position: absolute;
  top: -16px;
  left: 0;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 2px solid var(--paper);
  border-radius: 50%;
  color: #fff;
  background: var(--ink);
  font: 650 12px/1 var(--mono);
}

.roadmap strong {
  display: block;
  margin-bottom: 7px;
  color: var(--ink);
  font-size: 15px;
}

.queue {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 36px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: queue 1;
}

.queue li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  counter-increment: queue;
  font-weight: 620;
  line-height: 1.5;
}

.queue li::before {
  content: "0" counter(queue);
  color: var(--faint);
  font: 12px/1.9 var(--mono);
}

.dual-publish {
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
}

.publish-column { padding: 34px; }
.publish-column + .publish-column { border-left: 1px solid var(--line); }
.publish-column h3 { margin-bottom: 8px; font-size: 19px; }
.publish-column p { margin-bottom: 0; color: var(--muted); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 42px 0 54px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

/* Article */
.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 720px) 210px;
  gap: 90px;
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
  padding: 80px 0 96px;
}

.article-header { margin-bottom: 54px; }

.article-header h1 {
  margin-bottom: 28px;
  font-size: clamp(40px, 6vw, 66px);
}

.article-deck {
  color: var(--muted);
  font-size: 21px;
  line-height: 1.65;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 30px;
  color: var(--faint);
  font-size: 13px;
}

.article-body {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.95;
}

.article-body h2 {
  margin: 76px 0 22px;
  font-family: var(--sans);
  font-size: 31px;
  line-height: 1.32;
  letter-spacing: -0.025em;
}

.article-body h3 {
  margin: 42px 0 14px;
  font-family: var(--sans);
  font-size: 21px;
  letter-spacing: -0.015em;
}

.article-body p,
.article-body ul,
.article-body ol { margin-bottom: 24px; }

.article-body li { margin-bottom: 8px; padding-left: 5px; }

.article-body blockquote {
  margin: 36px 0 42px;
  padding: 27px 30px;
  border-left: 4px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: var(--accent-soft);
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 650;
  line-height: 1.65;
}

.article-body .callout {
  margin: 30px 0;
  padding: 24px 26px;
  border: 1px solid #d9dff3;
  border-radius: 16px;
  background: #f4f6ff;
  font-family: var(--sans);
  font-size: 15px;
}

.comparison-wrap {
  margin: 32px 0 38px;
  overflow-x: auto;
}

.comparison {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 14px;
}

.comparison th,
.comparison td {
  padding: 15px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.comparison th { background: #f4f2ed; font-weight: 720; }

.toc {
  position: sticky;
  top: 96px;
  align-self: start;
  padding-left: 20px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.toc strong {
  display: block;
  margin-bottom: 15px;
  color: var(--ink);
  font: 650 12px/1.4 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.toc a { display: block; margin: 9px 0; line-height: 1.45; }
.toc a:hover { color: var(--accent); }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 36px;
  color: var(--muted);
  font-size: 14px;
}

.back-link:hover { color: var(--ink); }

.source-note {
  margin-top: 74px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
}

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 34px; padding-top: 68px; }
  .hero-aside { max-width: 640px; }
  .section-head { grid-template-columns: 1fr; gap: 12px; }
  .featured-card { grid-template-columns: 1fr; }
  .featured-visual { min-height: 280px; }
  .topic-card, .topic-card:nth-child(4), .topic-card:nth-child(5) { grid-column: span 3; }
  .roadmap { grid-template-columns: 1fr; gap: 0; }
  .roadmap li { padding: 24px 0 24px 50px; border-top: 0; border-left: 2px solid var(--line); }
  .roadmap li::before { top: 20px; left: -16px; }
  .article-shell { grid-template-columns: 1fr; }
  .toc { display: none; }
}

@media (max-width: 600px) {
  .nav { width: min(100% - 28px, 1160px); }
  .nav-links a:not(:last-child) { display: none; }
  .page-shell, .article-shell { width: min(100% - 28px, 1160px); }
  h1 { font-size: 45px; }
  .hero { padding: 52px 0 58px; }
  .section { padding: 54px 0; }
  .featured-card { border-radius: 18px; }
  .featured-copy { padding: 26px; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card, .topic-card:nth-child(4), .topic-card:nth-child(5) { grid-column: auto; }
  .queue { grid-template-columns: 1fr; }
  .dual-publish { grid-template-columns: 1fr; }
  .publish-column + .publish-column { border-left: 0; border-top: 1px solid var(--line); }
  .site-footer { flex-direction: column; }
  .article-shell { padding-top: 46px; }
  .article-body { font-size: 17px; }
  .article-body h2 { margin-top: 58px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}