:root {
  --night: #07141d;
  --night-2: #0c2230;
  --ink: #102c38;
  --muted: #526a74;
  --paper: #f7f4ed;
  --white: #ffffff;
  --line: #d5d9d5;
  --cyan: #58d8d0;
  --cyan-dark: #087b7d;
  --signal: #d8ff68;
  --amber: #f0a64b;
  --red: #d76553;
  --soft-blue: #e8f3f1;
  --soft-amber: #fbefdc;
  --shadow: 0 24px 70px rgba(7, 20, 29, 0.12);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 7rem;
  background: var(--night);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--cyan-dark);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 0.08em;
}

a:hover {
  color: #034f59;
}

a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.6rem;
  left: 0.8rem;
  padding: 0.65rem 0.9rem;
  color: var(--night);
  background: var(--signal);
  font-weight: 800;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.global-header {
  position: sticky;
  z-index: 50;
  top: 0;
  color: var(--white);
  background: rgba(7, 20, 29, 0.97);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.header-inner {
  width: min(1240px, calc(100% - 2rem));
  min-height: 4.7rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.brand {
  display: grid;
  gap: 0.08rem;
  flex: 0 0 auto;
  color: var(--white);
  text-decoration: none;
}

.brand-name {
  font-size: 0.96rem;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.brand-desk {
  color: #9bb5bd;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.draft-chip {
  padding: 0.22rem 0.55rem;
  color: var(--night);
  background: var(--signal);
  border-radius: 999px;
  font-size: 0.63rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.project-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.18rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.project-nav a {
  padding: 0.7rem 0.62rem;
  color: #c8d8dc;
  border-bottom: 2px solid transparent;
  font-size: 0.78rem;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.project-nav a:hover,
.project-nav a.active {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

.hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background:
    radial-gradient(circle at 83% 22%, rgba(88, 216, 208, 0.18), transparent 28%),
    linear-gradient(142deg, var(--night) 0%, #0a1f2c 64%, #133745 100%);
}

.hero::after {
  content: "";
  position: absolute;
  right: -10rem;
  bottom: -17rem;
  width: 35rem;
  height: 35rem;
  border: 7rem solid rgba(216, 255, 104, 0.045);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 2rem));
  min-height: 31rem;
  margin: 0 auto;
  padding: 5.8rem 0 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(17rem, 0.7fr);
  align-items: end;
  gap: clamp(2rem, 6vw, 6rem);
}

.eyebrow,
.section-kicker {
  margin: 0 0 1rem;
  color: var(--cyan);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 14ch;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.35rem, 8vw, 7.2rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.91;
}

.hero-subtitle {
  max-width: 42rem;
  margin: 1.55rem 0 0;
  color: #d9e4e7;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  line-height: 1.38;
}

.hero-meta {
  margin: 1.6rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.25rem;
  color: #9fb4bc;
  font-size: 0.78rem;
  font-weight: 700;
  list-style: none;
}

.hero-card {
  margin: 0;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-top: 3px solid var(--signal);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.18);
}

.hero-card .card-kicker {
  margin: 0 0 0.7rem;
  color: var(--signal);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero-card strong {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--white);
  font-family: var(--serif);
  font-size: 1.35rem;
  line-height: 1.25;
}

.hero-card p:last-child {
  margin: 0;
  color: #c3d3d7;
  font-size: 0.9rem;
  line-height: 1.55;
}

.content-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4.5rem 0 6.5rem;
}

.content-shell.with-toc {
  display: grid;
  grid-template-columns: 14rem minmax(0, 48rem);
  justify-content: center;
  gap: 4.5rem;
}

.toc {
  position: sticky;
  top: 6.2rem;
  align-self: start;
  max-height: calc(100vh - 8rem);
  padding: 1.1rem 1rem;
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.5);
  border-left: 3px solid var(--cyan-dark);
}

.toc p {
  margin: 0 0 0.65rem;
  color: var(--muted);
  font-size: 0.69rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.toc a {
  display: block;
  padding: 0.25rem 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
  text-decoration: none;
}

.toc a:hover {
  color: var(--cyan-dark);
}

.prose {
  width: min(100%, 48rem);
  margin: 0 auto;
}

.prose > h2 {
  margin: 5rem 0 1.2rem;
  padding-top: 1rem;
  color: var(--ink);
  border-top: 1px solid var(--line);
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.prose > h2:first-child {
  margin-top: 0;
}

.prose h3 {
  margin: 2.5rem 0 0.65rem;
  color: #145b64;
  font-family: var(--serif);
  font-size: 1.55rem;
  line-height: 1.22;
}

.prose h4 {
  margin: 2rem 0 0.45rem;
  font-size: 1.08rem;
}

.prose p,
.prose li {
  max-width: 72ch;
}

.prose p {
  margin: 0 0 1.2rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.5rem;
  padding-left: 1.4rem;
}

.prose li {
  margin: 0.5rem 0;
  padding-left: 0.18rem;
}

.prose blockquote {
  margin: 2.2rem 0;
  padding: 1.4rem 1.55rem;
  color: #153e49;
  background: var(--soft-blue);
  border-left: 5px solid var(--cyan-dark);
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.48;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose code {
  padding: 0.08em 0.3em;
  color: #0d4a52;
  background: #e3ece9;
  border-radius: 0.2rem;
  font-size: 0.92em;
}

.prose hr {
  margin: 4rem 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.prose a {
  overflow-wrap: anywhere;
}

.economy-grid,
.slo-grid,
.pillar-grid,
.pathway-grid,
.plane-grid,
.route-grid,
.source-grid {
  margin: 2rem 0 2.4rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.economy-card,
.slo-card,
.pillar-card,
.pathway-card,
.plane-card,
.route-card,
.source-card {
  padding: 1.35rem;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 10px 30px rgba(7, 20, 29, 0.055);
}

.economy-card {
  border-top: 5px solid var(--cyan-dark);
}

.economy-card.legacy {
  border-top-color: var(--amber);
}

.card-label {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-size: 0.69rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.economy-card h3,
.slo-card h3,
.pillar-card h3,
.pathway-card h3,
.plane-card h3,
.route-card h3 {
  margin: 0 0 0.65rem;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.4rem;
  line-height: 1.2;
}

.economy-card p,
.slo-card p,
.pillar-card p,
.pathway-card p,
.plane-card p,
.route-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.loop-visual {
  margin: 2.2rem 0;
  display: grid;
  gap: 1rem;
}

.loop-track {
  padding: 1.25rem;
  color: var(--white);
  background: var(--night-2);
  border-left: 5px solid var(--red);
}

.loop-track.defense {
  border-left-color: var(--signal);
}

.loop-track h3 {
  margin: 0 0 0.9rem;
  color: var(--white);
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.loop-track ol {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.loop-track li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #dce8ea;
  font-size: 0.82rem;
  font-weight: 760;
}

.loop-track li:not(:last-child)::after {
  content: "→";
  color: var(--cyan);
  margin-left: 0.15rem;
}

.slo-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.slo-card {
  position: relative;
  padding-top: 3.2rem;
}

.slo-card span {
  position: absolute;
  top: 1rem;
  left: 1.35rem;
  color: var(--cyan-dark);
  font-size: 0.72rem;
  font-weight: 950;
  letter-spacing: 0.12em;
}

.pillar-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.pillar-card {
  background: var(--night-2);
  border-color: #244551;
  border-top: 4px solid var(--cyan);
}

.pillar-card h3 {
  color: var(--white);
}

.pillar-card p {
  color: #bfd0d5;
}

.route-card {
  display: block;
  color: inherit;
  border-top: 4px solid var(--cyan-dark);
  text-decoration: none;
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.route-card:hover {
  color: inherit;
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.route-card .route-link {
  display: block;
  margin-top: 1rem;
  color: var(--cyan-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.capability-list,
.stack-list,
.timeline,
.enforcement-rail,
.deadline-grid {
  margin: 2rem 0 2.5rem;
}

.capability-list,
.stack-list,
.timeline,
.enforcement-rail {
  padding: 0;
  list-style: none;
  counter-reset: item;
}

.capability-list li,
.stack-list li,
.timeline li,
.enforcement-rail li {
  position: relative;
  margin: 0;
  padding: 1.1rem 1rem 1.1rem 4.4rem;
  border-top: 1px solid var(--line);
}

.capability-list li::before,
.stack-list li::before,
.timeline li::before,
.enforcement-rail li::before {
  counter-increment: item;
  content: counter(item, decimal-leading-zero);
  position: absolute;
  top: 1.1rem;
  left: 0.75rem;
  color: var(--cyan-dark);
  font-size: 0.75rem;
  font-weight: 950;
  letter-spacing: 0.1em;
}

.capability-list strong,
.stack-list strong,
.timeline strong,
.enforcement-rail strong {
  display: block;
  color: var(--ink);
  font-size: 1rem;
}

.capability-list span,
.stack-list span,
.timeline span,
.enforcement-rail span {
  display: block;
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.deadline-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
}

.deadline-card {
  padding: 1rem;
  background: var(--soft-amber);
  border-top: 4px solid var(--amber);
}

.deadline-card strong {
  display: block;
  color: #78430d;
  font-family: var(--serif);
  font-size: 1.6rem;
}

.deadline-card p {
  margin: 0.3rem 0 0;
  color: #684f36;
  font-size: 0.8rem;
  line-height: 1.45;
}

.paper-intro {
  margin-bottom: 3.5rem;
  padding: 1.4rem 1.55rem;
  background: var(--soft-amber);
  border-left: 5px solid var(--amber);
}

.paper-intro p {
  margin: 0;
}

.footnote-ref {
  vertical-align: super;
  font-size: 0.7em;
  line-height: 0;
}

.footnote-ref a {
  font-weight: 800;
  text-decoration: none;
}

.sources-list {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: source;
}

.sources-list li,
.source-card {
  position: relative;
  overflow-wrap: anywhere;
}

.sources-list li {
  margin: 0;
  padding: 1.1rem 1rem 1.1rem 3.6rem;
  border-top: 1px solid var(--line);
  font-size: 0.86rem;
  line-height: 1.55;
}

.sources-list li::before {
  content: attr(data-number);
  position: absolute;
  left: 0.6rem;
  color: var(--cyan-dark);
  font-weight: 950;
}

.backref {
  margin-left: 0.4rem;
  text-decoration: none;
}

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

.source-card {
  padding-left: 4.1rem;
}

.source-number {
  position: absolute;
  top: 1.35rem;
  left: 1.2rem;
  color: var(--cyan-dark);
  font-size: 0.74rem;
  font-weight: 950;
  letter-spacing: 0.1em;
}

.source-card p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.55;
}

.site-footer {
  color: #b9cbd0;
  background: var(--night);
}

.footer-inner {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem 3rem;
  align-items: end;
}

.footer-brand {
  margin: 0 0 0.2rem;
  color: var(--white);
  font-size: 0.77rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.footer-inner p {
  margin: 0;
}

.footer-inner nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.7rem 1.2rem;
}

.footer-inner a {
  color: var(--cyan);
  font-size: 0.82rem;
  font-weight: 750;
}

.footer-status {
  grid-column: 1 / -1;
  padding-top: 1rem;
  color: #78939c;
  border-top: 1px solid #1c3945;
  font-size: 0.72rem;
}

@media (max-width: 980px) {
  .header-inner {
    padding: 0.6rem 0 0;
    flex-wrap: wrap;
  }

  .project-nav {
    order: 3;
    width: 100%;
    margin: 0;
  }

  .hero-inner {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 4.5rem 0;
  }

  .hero-card {
    max-width: 36rem;
  }

  .content-shell.with-toc {
    display: block;
  }

  .toc {
    position: static;
    max-height: none;
    margin-bottom: 3rem;
    columns: 2;
  }

  .toc p {
    column-span: all;
  }

  .slo-grid,
  .pillar-grid,
  .deadline-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  html {
    scroll-padding-top: 8.5rem;
  }

  body {
    font-size: 17px;
  }

  .header-inner {
    width: min(100% - 1.2rem, 1240px);
    gap: 0.6rem;
  }

  .brand-desk {
    display: none;
  }

  .draft-chip {
    margin-left: auto;
  }

  .project-nav a {
    padding: 0.55rem 0.58rem 0.65rem;
  }

  .hero-inner,
  .content-shell,
  .footer-inner {
    width: min(100% - 1.35rem, 1180px);
  }

  .hero-inner {
    padding: 3.4rem 0 3.7rem;
  }

  .hero h1 {
    font-size: clamp(2.75rem, 13.5vw, 3.75rem);
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .content-shell {
    padding: 3.5rem 0 5rem;
  }

  .prose > h2 {
    margin-top: 4rem;
    font-size: 2rem;
  }

  .prose h3 {
    font-size: 1.38rem;
  }

  .prose blockquote {
    padding: 1.15rem;
    font-size: 1.12rem;
  }

  .economy-grid,
  .slo-grid,
  .pillar-grid,
  .pathway-grid,
  .plane-grid,
  .route-grid,
  .deadline-grid {
    grid-template-columns: 1fr;
  }

  .toc {
    columns: 1;
  }

  .loop-track ol {
    display: grid;
    gap: 0.25rem;
  }

  .loop-track li:not(:last-child)::after {
    content: "↓";
  }

  .footer-inner {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .footer-inner nav {
    justify-content: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}