@font-face {
  font-family: "Source Sans 3";
  src: url("../fonts/source-sans-3-latin-wght-normal.woff2") format("woff2-variations");
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
}

@font-face {
  font-family: "Source Serif 4";
  src: url("../fonts/source-serif-4-latin-wght-italic.woff2") format("woff2-variations");
  font-style: italic;
  font-weight: 200 900;
  font-display: swap;
}

:root {
  --white: #fff;
  --blueprint: #17324d;
  --graphite: #24282e;
  --signal: #2456c4;
  --yellow: #f2c14e;
  --mist: #e8eff5;
  --line: #c4d0da;
  --sans: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  --serif: "Source Serif 4", Georgia, serif;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --max: 90rem;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--graphite);
  background: var(--white);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  overflow-wrap: break-word;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }

a:focus-visible {
  outline: 3px solid #111;
  outline-offset: 4px;
  box-shadow: 0 0 0 7px var(--yellow);
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 1rem;
  color: var(--white);
  background: var(--signal);
  font-weight: 700;
  transform: translateY(-200%);
}

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

.site-header,
footer {
  width: min(100%, var(--max));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-header {
  min-height: 5.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  color: var(--blueprint);
  font-size: 1.15rem;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

nav { display: flex; align-items: center; gap: clamp(1rem, 2.8vw, 2.5rem); }
nav a { font-size: 0.93rem; font-weight: 650; text-decoration-thickness: 1px; text-underline-offset: 0.35rem; }
nav a:not(:hover, :focus-visible) { text-decoration-color: transparent; }

.nav-buy {
  padding: 0.45rem 1rem;
  border: 2px solid var(--signal);
  color: var(--signal);
  text-decoration: none;
}

main > section { padding-inline: var(--gutter); }

.hero {
  position: relative;
  min-height: min(52rem, calc(100vh - 5.5rem));
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(20rem, 7fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 7rem);
  max-width: var(--max);
  margin-inline: auto;
  padding-block: clamp(4rem, 8vw, 8rem);
  overflow: hidden;
}

.hero-copy { position: relative; z-index: 2; }

.hero-thesis {
  margin: 0 0 clamp(1.5rem, 3vw, 3rem);
  color: var(--signal);
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  font-weight: 680;
}

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

h1, h2, h3 {
  color: var(--blueprint);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

h1 {
  max-width: 8ch;
  margin-bottom: 1.75rem;
  font-size: clamp(3.2rem, 6vw, 5.5rem);
  font-weight: 790;
  overflow-wrap: normal;
}

h2 { font-size: clamp(2.35rem, 4.5vw, 4.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.65rem); letter-spacing: -0.025em; }

.hero-summary {
  max-width: 34rem;
  margin-bottom: 2rem;
  font-size: clamp(1.1rem, 1.7vw, 1.35rem);
}

.hero-actions { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }

.button {
  display: inline-flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.35rem;
  border: 2px solid var(--signal);
  color: var(--white);
  background: var(--signal);
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease;
}

.button:hover { color: var(--signal); background: transparent; }
.text-link { color: var(--blueprint); font-weight: 700; text-underline-offset: 0.35rem; }
.pending-note { margin: 0.85rem 0 0; font-size: 0.84rem; color: #515860; }

.hero-art { position: relative; min-height: 39rem; display: grid; place-items: center; }
.complexity-lines { position: absolute; inset: 2% -14% auto -9%; width: 123%; height: 96%; }
.complexity-lines path {
  fill: none;
  stroke: #9db3c5;
  stroke-width: 1.5;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  vector-effect: non-scaling-stroke;
  animation: draw-path 800ms ease-out forwards;
}

.complexity-lines path:nth-child(2) { animation-delay: 70ms; }
.complexity-lines path:nth-child(3) { animation-delay: 140ms; }
.complexity-lines path:nth-child(4) { animation-delay: 210ms; }
.complexity-lines path:nth-child(5) { animation-delay: 280ms; }
.complexity-lines .clear-path { stroke: var(--yellow); stroke-width: 6; animation-delay: 620ms; animation-duration: 550ms; }

.cover-wrap {
  position: relative;
  z-index: 1;
  width: min(56%, 21rem);
  filter: drop-shadow(1.4rem 1.4rem 0 rgba(23, 50, 77, 0.13));
  transform: rotate(2.5deg);
  animation: settle-cover 850ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.cover-wrap img { width: 100%; height: auto; }

@keyframes draw-path {
  to { stroke-dashoffset: 0; }
}

@keyframes settle-cover {
  from { transform: translateY(1rem) rotate(5deg) scale(0.98); }
  to { transform: translateY(0) rotate(2.5deg) scale(1); }
}

.premise,
.takeaways,
.author {
  max-width: var(--max);
  margin-inline: auto;
  padding-block: clamp(5.5rem, 10vw, 10rem);
}

.premise,
.takeaways {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(2rem, 5vw, 6rem);
}

.section-intro { grid-column: 1 / span 7; }
.section-kicker { margin-bottom: 1.25rem; color: var(--signal); font-size: 1rem; font-weight: 740; }
.section-intro h2 { margin-bottom: 0; }
.premise-copy { grid-column: 8 / -1; padding-top: 0.15rem; font-size: clamp(1.05rem, 1.4vw, 1.25rem); }
.premise-copy p:last-child { margin-bottom: 0; }

.tensions {
  padding-block: clamp(5.5rem, 9vw, 9rem);
  color: var(--white);
  background: var(--blueprint);
}

.tensions-heading,
.principle-grid { max-width: calc(var(--max) - 2 * var(--gutter)); margin-inline: auto; }
.tensions-heading { margin-bottom: clamp(3rem, 7vw, 7rem); }
.tensions-heading p { margin-bottom: 0; color: #b8cce0; font-size: clamp(2.35rem, 4.5vw, 4.5rem); line-height: 1; letter-spacing: -0.05em; }
.tensions-heading h2 { color: var(--white); }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(2rem, 5vw, 6rem); }
.principle-grid article { border-top: 1px solid #7790a8; padding-top: 2rem; }
.principle-grid svg { width: 7.5rem; margin-bottom: 2.5rem; }
.principle-grid svg * { fill: none; stroke: var(--yellow); stroke-width: 2; }
.principle-grid h3 { margin-bottom: 1rem; color: var(--white); }
.principle-grid p { margin-bottom: 0; color: #dce5ed; }

.napkin {
  padding-block: clamp(6rem, 12vw, 12rem);
  background: var(--mist);
  overflow: hidden;
}

.napkin-paper {
  position: relative;
  width: min(45rem, 92%);
  margin-inline: auto;
  padding: clamp(3rem, 8vw, 6rem) clamp(1.5rem, 6vw, 5rem);
  text-align: center;
  background: var(--white);
  box-shadow: 1.5rem 1.5rem 0 #d5e0e9;
  transform: rotate(-1.5deg);
}

.napkin-paper::before,
.napkin-paper::after { content: ""; position: absolute; inset-inline: 0; border-top: 1px dashed #d3dae0; }
.napkin-paper::before { top: 1.25rem; }
.napkin-paper::after { bottom: 1.25rem; }
.napkin-paper > span { color: #6a737c; font-size: 0.85rem; }
.napkin-paper h2 { margin: 1.5rem 0; font-family: var(--serif); font-style: italic; font-weight: 650; }
.napkin-paper h2 i { color: var(--signal); font-weight: 400; }
.napkin-paper p { max-width: 31rem; margin: 0 auto; }

.takeaways { align-items: start; }
.takeaways ul { grid-column: 8 / -1; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.takeaways li { padding: 1.5rem 0; border-bottom: 1px solid var(--line); }
.takeaways strong, .takeaways span { display: block; }
.takeaways strong { color: var(--blueprint); font-size: 1.14rem; }
.takeaways span { color: #515860; }

.author {
  display: grid;
  grid-template-columns: minmax(16rem, 5fr) minmax(0, 6fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 9rem);
  border-top: 1px solid var(--line);
}

.author-visual { position: relative; background: var(--mist); }
.author-visual::after { content: "Portrait forthcoming"; position: absolute; right: 1rem; bottom: 0.75rem; color: #52687b; font-size: 0.75rem; }
.author-visual img { width: 100%; height: auto; }
.author-copy { max-width: 39rem; }
.author-copy h2 { margin-bottom: 2rem; }
.author-copy p { font-size: 1.06rem; }
.author-copy .author-lead { color: var(--blueprint); font-size: clamp(1.2rem, 2vw, 1.5rem); font-weight: 680; line-height: 1.45; }

.closing {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 3rem;
  padding-block: clamp(5rem, 9vw, 9rem);
  color: var(--white);
  background: var(--signal);
}

.closing > * { width: min(100%, calc((var(--max) - 2 * var(--gutter)) / 2)); }
.closing h2 { margin-bottom: 1.5rem; color: var(--white); }
.closing p { max-width: 39rem; margin-bottom: 0; font-size: 1.15rem; }
.closing-action { display: flex; flex-direction: column; align-items: flex-start; gap: 0.8rem; }
.button-light { border-color: var(--white); color: var(--signal); background: var(--white); }
.button-light:hover { color: var(--white); background: transparent; }
.closing-action span { font-size: 0.84rem; }

footer {
  min-height: 8rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 2rem;
}

footer p { margin: 0; font-size: 0.86rem; }
footer p:last-child { text-align: right; }

.error-page { min-height: 100vh; color: var(--white); background: var(--blueprint); }
.error-page .site-header { border-color: #637b91; }
.error-page .wordmark { color: var(--white); }
.error-main { max-width: 52rem; min-height: calc(100vh - 5.5rem); display: flex; flex-direction: column; justify-content: center; margin-inline: auto; padding: 4rem var(--gutter); }
.error-main h1 { max-width: 12ch; color: var(--white); font-size: clamp(3rem, 8vw, 6rem); }
.error-main > p:not(.error-code) { font-size: 1.2rem; }
.error-main .button { align-self: flex-start; border-color: var(--yellow); color: var(--blueprint); background: var(--yellow); }
.error-code { margin-bottom: 1rem; color: var(--yellow); font-weight: 800; }

@media (max-width: 800px) {
  .site-header { min-height: 4.5rem; }
  nav a:not(.nav-buy) { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 3.5rem; }
  .hero-art { min-height: 33rem; }
  .cover-wrap { width: min(62%, 18rem); }
  .premise, .takeaways { grid-template-columns: 1fr; }
  .section-intro, .premise-copy, .takeaways ul { grid-column: 1; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article { display: grid; grid-template-columns: 6rem 1fr; column-gap: 1.5rem; }
  .principle-grid svg { grid-row: span 2; margin: 0; }
  .author { grid-template-columns: 1fr; }
  .author-visual { width: min(100%, 30rem); }
  .closing { align-items: start; flex-direction: column; }
  .closing > * { width: 100%; }
  footer { grid-template-columns: 1fr 1fr; padding-block: 2rem; }
  footer p:first-of-type { display: none; }
}

@media (max-width: 430px) {
  h1 { max-width: none; font-size: clamp(2.75rem, 12vw, 3.25rem); }
  .hero-art { min-height: 28rem; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .text-link { align-self: flex-start; }
  .principle-grid article { display: block; }
  .principle-grid svg { margin-bottom: 1.5rem; }
  .napkin-paper { width: 100%; box-shadow: 0.75rem 0.75rem 0 #d5e0e9; }
  footer { grid-template-columns: 1fr; }
  footer p:last-child { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
  .complexity-lines path { stroke-dashoffset: 0; animation: none; }
  .cover-wrap { animation: none; }
}