:root {
  color-scheme: light;
  --ink: #171717;
  --muted: #5d5d5d;
  --paper: #f6f2eb;
  --card: #fffdf9;
  --line: #d8d0c4;
  --bmj: #c41230;
  --cloudflare: #f48120;
  --blue: #173a5e;
  --green: #2b6754;
  --shadow: 0 18px 50px rgba(36, 27, 17, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 86% 3%, rgba(244, 129, 32, 0.18), transparent 24rem),
    radial-gradient(circle at 4% 30%, rgba(196, 18, 48, 0.1), transparent 28rem),
    var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

code {
  padding: 0.12rem 0.3rem;
  border-radius: 0.25rem;
  color: #7e1024;
  background: #f4e7e8;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  overflow-wrap: anywhere;
}

.wrap {
  width: min(1160px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(23, 23, 23, 0.12);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.mark {
  display: inline-grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.55rem;
  color: white;
  background: var(--bmj);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.site-nav a {
  padding: 0.5rem 0.7rem;
  border-radius: 0.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 750;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 3rem;
  align-items: end;
  padding: 5rem 0 3.5rem;
}

.hero.compact {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.55fr);
  padding-bottom: 3rem;
}

.eyebrow {
  color: var(--bmj);
  font-size: 0.8rem;
  font-weight: 850;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1,
h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
  letter-spacing: -0.045em;
}

h1 {
  max-width: 820px;
  margin: 0.7rem 0 1rem;
  font-size: clamp(3rem, 7vw, 6rem);
  line-height: 0.96;
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.06;
}

h3 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.025em;
}

.lede {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.hero-note {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-top: 4px solid var(--cloudflare);
  border-radius: 0.85rem;
  background: rgba(255, 255, 255, 0.62);
}

.hero-note strong {
  display: block;
  margin-bottom: 0.35rem;
}

.hero-note p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.5rem;
}

.jump-links a,
.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.42rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.66);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  text-decoration: none;
}

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin: 1.5rem 0 1.25rem;
}

.section-heading p {
  max-width: 520px;
  margin: 0;
  color: var(--muted);
}

.poc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 4.5rem;
}

.poc-card {
  display: flex;
  min-height: 390px;
  flex-direction: column;
  padding: 1.45rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--card);
  box-shadow: var(--shadow);
}

.poc-card:nth-child(1) {
  border-top: 5px solid var(--bmj);
}

.poc-card:nth-child(2) {
  border-top: 5px solid var(--green);
}

.poc-card:nth-child(3) {
  border-top: 5px solid var(--blue);
}

.poc-card:nth-child(4) {
  border-top: 5px solid var(--cloudflare);
}

.poc-card:nth-child(5) {
  grid-column: 1 / -1;
  min-height: 0;
  border-top: 5px solid #6d28d9;
}

.card-kicker {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.poc-card h3 {
  margin: 0.8rem 0 0.55rem;
  font-size: 1.55rem;
}

.poc-card > p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.view-links {
  margin: 0 0 1.1rem;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.84rem;
}

.view-links li + li {
  margin-top: 0.28rem;
}

.actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: auto;
}

.button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.72rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  font-size: 0.86rem;
  font-weight: 750;
  text-decoration: none;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: var(--ink);
}

.button.primary {
  border-color: var(--ink);
  color: white;
  background: var(--ink);
}

.button::after {
  content: "↗";
}

.content-section {
  padding: 3.5rem 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 1rem;
}

.content-section:first-of-type {
  border-top: 0;
}

.section-layout {
  display: grid;
  grid-template-columns: minmax(230px, 0.6fr) minmax(0, 1.4fr);
  gap: 2rem;
  align-items: start;
}

.section-intro {
  position: sticky;
  top: 1rem;
}

.section-intro p {
  color: var(--muted);
}

.system-panel,
.diagram-shell,
.principle {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--card);
}

.system-panel + .system-panel {
  margin-top: 1rem;
}

.system-panel h3 {
  margin-bottom: 0.55rem;
}

.system-panel p {
  margin: 0;
  color: var(--muted);
}

.system-panel ul,
.numbered-flow {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.system-panel li + li,
.numbered-flow li + li {
  margin-top: 0.55rem;
}

.flow-label {
  display: inline-block;
  margin-bottom: 0.7rem;
  color: var(--bmj);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
  font-size: 0.88rem;
  font-weight: 750;
}

.link-row a {
  text-underline-offset: 0.2em;
}

.principles-grid,
.diagram-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 4rem;
}

.principle h3 {
  margin-bottom: 0.45rem;
  font-size: 1.05rem;
}

.principle p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.diagram-section {
  padding: 1rem 0 3.5rem;
  scroll-margin-top: 1rem;
}

.diagram-section + .diagram-section {
  padding-top: 3.5rem;
  border-top: 1px solid var(--line);
}

.diagram-shell {
  margin: 1.3rem 0 0;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.diagram-shell img {
  display: block;
  width: 100%;
  height: auto;
}

.diagram-caption {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.85rem;
  color: var(--muted);
  font-size: 0.84rem;
}

.diagram-caption p {
  max-width: 760px;
  margin: 0;
}

.source-links {
  display: flex;
  flex-wrap: wrap;
  flex-shrink: 0;
  gap: 0.7rem;
  font-weight: 750;
}

.source-links a {
  text-underline-offset: 0.2em;
}

.callout {
  margin: 1.2rem 0 4rem;
  padding: 1.2rem 1.3rem;
  border-left: 5px solid var(--cloudflare);
  background: rgba(255, 255, 255, 0.58);
}

.callout p {
  margin: 0;
  color: var(--muted);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 850px) {
  .hero,
  .hero.compact,
  .section-layout {
    grid-template-columns: 1fr;
  }

  .section-intro {
    position: static;
  }

  .poc-grid,
  .principles-grid,
  .diagram-notes {
    grid-template-columns: 1fr;
  }

  .poc-card {
    min-height: 0;
  }

  .poc-card:nth-child(5) {
    grid-column: auto;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }

  .diagram-caption {
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .site-header,
  .footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.15rem;
  }

  .hero {
    padding-top: 3.4rem;
  }

  .actions {
    grid-template-columns: 1fr;
  }

  .diagram-shell {
    padding: 0.6rem;
    overflow-x: auto;
  }

  .diagram-shell img {
    width: 980px;
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button {
    transition: none;
  }
}