:root {
  --paper: #f7f8f4;
  --white: #ffffff;
  --ink: #102f24;
  --muted: #52635b;
  --forest: #173b2d;
  --green: #26754b;
  --mint: #e6eee5;
  --border: #d3ded2;
  --spring: #7bbf8a;
  --serif: "Crimson Pro", Georgia, serif;
  --sans: "Inter", Arial, sans-serif;
  --mono: "JetBrains Mono", monospace;
  --gutter: clamp(1.2rem, 4vw, 4.5rem);
  --measure: 76rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 4px;
}

.closing a:focus-visible,
footer a:focus-visible {
  outline-color: var(--white);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  background: var(--white);
  color: var(--forest);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  transform: translateY(-180%);
}

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

.site-header {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 5.6rem;
  padding: 0 var(--gutter);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  color: var(--forest);
  font-family: var(--sans);
  font-size: clamp(0.9rem, 1.6vw, 1.05rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  text-decoration: none;
}

.wordmark::before {
  display: inline-flex;
  align-self: center;
  align-items: center;
  justify-content: center;
  width: 1.6em;
  height: 1.6em;
  border: 1.5px solid var(--green);
  border-radius: 4px;
  color: var(--green);
  font-size: 0.85em;
  font-weight: 800;
  letter-spacing: 0;
  content: "B";
}

.wordmark i {
  padding-left: 0.48rem;
  border-left: 1px solid var(--green);
  color: var(--green);
  font-family: var(--serif);
  font-weight: 400;
}

.site-header nav,
footer nav {
  display: flex;
  align-items: center;
  gap: clamp(0.85rem, 2.8vw, 2rem);
}

.site-header nav a,
footer nav a {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-header nav a:hover {
  color: var(--green);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(24rem, 0.98fr);
  min-height: calc(100vh - 5.6rem);
  border-bottom: 1px solid var(--border);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: clamp(4rem, 9vw, 8rem) var(--gutter);
}

.eyebrow,
.kicker {
  margin: 0 0 1.5rem;
  color: var(--green);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  gap: 0.8rem;
}

.eyebrow span + span::before {
  content: "/";
  margin-right: 0.8rem;
  color: var(--border);
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 0.96;
}

h1 {
  max-width: 12ch;
  font-size: clamp(3.8rem, 7.2vw, 7.4rem);
  text-wrap: balance;
}

h1 em {
  color: var(--green);
  font-weight: 400;
}

h2 {
  max-width: 16ch;
  font-size: clamp(2.6rem, 5vw, 5rem);
}

h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.45rem, 2.2vw, 2.05rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.04;
}

.lede {
  max-width: 37rem;
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.4rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.78rem 1.1rem;
  border: 1px solid var(--forest);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

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

.button-primary:hover {
  background: var(--green);
  border-color: var(--green);
}

.button-quiet:hover {
  background: var(--mint);
}

.bridge-figure {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  min-height: 38rem;
  margin: 0;
  padding: clamp(2rem, 5vw, 5rem);
  overflow: hidden;
  background: var(--mint);
  border-left: 1px solid var(--border);
}

.bridge-figure::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 2.5rem 2.5rem;
  content: "";
  opacity: 0.48;
}

.bridge-figure svg {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  color: var(--forest);
}

.bridge-figure svg path,
.bridge-figure svg circle {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.bridge-deck {
  stroke-width: 9;
}

.bridge-arch {
  stroke-width: 4;
}

.bridge-support {
  stroke-width: 2;
}

.bridge-figure svg circle {
  fill: var(--green);
  stroke: var(--mint);
  stroke-width: 4;
}

.bridge-figure .water-line {
  stroke: var(--green);
  stroke-width: 3;
}

.bridge-label {
  position: absolute;
  z-index: 2;
  top: 26%;
  display: grid;
  gap: 0.15rem;
}

.bridge-label-left {
  left: clamp(1.4rem, 5vw, 4rem);
}

.bridge-label-right {
  right: clamp(1.4rem, 5vw, 4rem);
  text-align: right;
}

.bridge-label span,
.bridge-figure figcaption {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.bridge-label strong {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 2vw, 1.55rem);
  font-weight: 500;
}

.bridge-figure figcaption {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-around;
  padding: 0.9rem;
  border: 1px solid var(--border);
  background: var(--paper);
  color: var(--muted);
}

.section {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(5rem, 10vw, 9rem) var(--gutter);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(8rem, 0.35fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.section-heading .kicker {
  padding-top: 0.45rem;
}

.definition-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(2rem, 7vw, 6rem);
  margin-top: clamp(3rem, 6vw, 5rem);
  padding-top: clamp(2rem, 4vw, 3.5rem);
  border-top: 1px solid var(--border);
}

.definition-statement {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.65rem, 3vw, 2.5rem);
  line-height: 1.18;
}

.source-note {
  align-self: start;
  padding: 1.5rem;
  background: var(--mint);
  border-left: 3px solid var(--green);
}

.source-note p {
  margin: 0;
}

.source-note p + p {
  margin-top: 0.8rem;
}

.source-note .kicker {
  margin: 0;
}

.canon-loop {
  color: var(--forest);
  font-family: var(--mono);
  font-size: 0.73rem;
  font-weight: 700;
  line-height: 1.8;
}

.method-track {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  margin: 5rem 0 0;
  padding: 0;
  border-top: 2px solid var(--forest);
  list-style: none;
}

.method-track li {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.4rem 0.8rem 1rem;
  border-right: 1px solid var(--border);
}

.method-track li::before {
  position: absolute;
  top: -0.48rem;
  left: 0.75rem;
  width: 0.8rem;
  height: 0.8rem;
  background: var(--green);
  border: 3px solid var(--paper);
  border-radius: 50%;
  content: "";
}

.method-track li:first-child {
  border-left: 1px solid var(--border);
}

.method-track span,
.method-track small,
.lens-mark,
.audience-grid article > span,
.connection-number,
.error-code {
  font-family: var(--mono);
}

.method-track span {
  color: var(--green);
  font-size: 0.62rem;
  font-weight: 700;
}

.method-track strong {
  margin: 0.7rem 0 0.45rem;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 500;
}

.method-track small {
  color: var(--muted);
  font-size: 0.62rem;
  line-height: 1.55;
}

.crossing {
  padding: clamp(4rem, 9vw, 8rem) var(--gutter);
  background: var(--green);
  color: var(--white);
  text-align: center;
}

.crossing p {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 5rem);
  letter-spacing: -0.045em;
  line-height: 1;
}

.crossing .crossing-emphasis {
  color: var(--mint);
  font-style: italic;
}

.framework-heading,
.boundary-heading {
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.4fr);
}

.framework-heading > p,
.boundary-heading > p {
  max-width: 31rem;
  margin: 3.1rem 0 0;
  color: var(--muted);
}

.lens-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

.lens-grid article {
  position: relative;
  min-height: 22rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.lens-grid article:nth-child(2),
.lens-grid article:nth-child(3) {
  background: var(--mint);
}

.lens-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4.5rem;
  height: 4.5rem;
  margin-bottom: 3rem;
  border: 1px solid var(--forest);
  border-radius: 50%;
  color: var(--green);
  font-size: 1.15rem;
  font-weight: 700;
}

.lens-grid .kicker {
  margin-bottom: 0.8rem;
}

.lens-grid article > p:last-child {
  max-width: 34rem;
  margin: 1.3rem 0 0;
  color: var(--muted);
}

.audience {
  max-width: none;
  background: var(--forest);
  color: var(--white);
}

.audience .section-heading,
.audience-grid {
  max-width: calc(var(--measure) - (2 * var(--gutter)));
  margin-right: auto;
  margin-left: auto;
}

.audience .kicker {
  color: var(--spring);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid color-mix(in srgb, var(--white) 25%, transparent);
}

.audience-grid article {
  padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 4vw, 3rem) 1rem;
}

.audience-grid article + article {
  border-left: 1px solid color-mix(in srgb, var(--white) 25%, transparent);
}

.audience-grid article > span {
  color: var(--spring);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.audience-grid h3 {
  margin-top: 1.4rem;
  font-size: clamp(2rem, 3vw, 3rem);
}

.audience-grid p {
  max-width: 34rem;
  color: var(--mint);
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(3rem, 6vw, 5rem);
  border: 1px solid var(--border);
}

.boundary-grid > div {
  padding: clamp(1.5rem, 4vw, 3.5rem);
}

.boundary-grid > div + div {
  border-left: 1px solid var(--border);
}

.boundary-positive {
  background: var(--mint);
}

.boundary-limit {
  background: var(--white);
}

.boundary-grid ul {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.boundary-grid li {
  position: relative;
  padding: 0.72rem 0 0.72rem 1.6rem;
  border-top: 1px solid var(--border);
}

.boundary-grid li::before {
  position: absolute;
  left: 0;
  color: var(--green);
  content: "→";
  font-family: var(--mono);
  font-weight: 700;
}

.connections {
  padding-top: 3rem;
}

.connection-list {
  margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--forest);
}

.connection-list a {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr) auto;
  gap: 1.2rem;
  align-items: center;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
}

.connection-list a:hover {
  padding-right: 0.8rem;
  padding-left: 0.8rem;
  background: var(--mint);
}

.connection-number {
  color: var(--green);
  font-size: 0.66rem;
  font-weight: 700;
}

.connection-list strong,
.connection-list small {
  display: block;
}

.connection-list strong {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 500;
}

.connection-list small {
  color: var(--muted);
}

.connection-list i {
  color: var(--green);
  font-size: 1.2rem;
  font-style: normal;
}

.closing {
  padding: clamp(5rem, 11vw, 10rem) var(--gutter);
  background: var(--green);
  color: var(--white);
  text-align: center;
}

.closing .kicker {
  color: var(--mint);
}

.closing h2 {
  max-width: 14ch;
  margin: 0 auto;
}

.button-light {
  margin-top: 2.3rem;
  background: var(--white);
  border-color: var(--white);
  color: var(--forest);
}

.button-light:hover {
  background: var(--mint);
}

footer {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  padding: 2.2rem var(--gutter);
  background: var(--forest);
  color: var(--mint);
}

.wordmark-footer {
  color: var(--white);
}

.wordmark-footer i {
  color: var(--spring);
}

.wordmark-footer::before {
  border-color: var(--spring);
  color: var(--spring);
}

footer > p {
  margin: 0;
  color: var(--mint);
  font-size: 0.78rem;
  text-align: center;
}

footer nav a:hover {
  color: var(--white);
}

.not-found-page {
  min-height: 100vh;
  background: var(--mint);
}

.not-found {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: calc(100vh - 5.6rem);
  padding: 4rem var(--gutter);
}

.not-found h1 {
  max-width: 12ch;
}

.not-found > p:not(.error-code) {
  max-width: 36rem;
  color: var(--muted);
  font-size: 1.1rem;
}

.error-code {
  color: var(--green);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .bridge-figure {
    min-height: 32rem;
    border-top: 1px solid var(--border);
    border-left: 0;
  }

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

  .method-track li:nth-child(5) {
    border-left: 1px solid var(--border);
  }

  footer {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  footer > p {
    text-align: left;
  }
}

@media (max-width: 720px) {
  .site-header {
    min-height: auto;
    flex-wrap: wrap;
    gap: 0.35rem 1.25rem;
    padding-top: 1rem;
    padding-bottom: 1rem;
  }

  .site-header nav {
    flex-wrap: wrap;
    gap: 0 1rem;
  }

  .site-header nav a {
    display: inline-flex;
    align-items: center;
    min-height: 2rem;
  }

  h1 br {
    display: none;
  }

  .hero {
    min-height: auto;
  }

  .hero-copy {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }

  .bridge-figure {
    min-height: 25rem;
    padding: 1.5rem;
  }

  .bridge-label {
    top: 22%;
  }

  .section-heading,
  .framework-heading,
  .boundary-heading,
  .definition-grid,
  .lens-grid,
  .audience-grid,
  .boundary-grid {
    grid-template-columns: 1fr;
  }

  .section-heading {
    gap: 0.5rem;
  }

  .section-heading .kicker {
    padding-top: 0;
  }

  .definition-grid {
    gap: 2rem;
  }

  .framework-heading > p,
  .boundary-heading > p {
    margin-top: 1rem;
  }

  .method-track {
    grid-template-columns: 1fr;
    border-top: 0;
    border-left: 2px solid var(--forest);
  }

  .method-track li,
  .method-track li:first-child,
  .method-track li:nth-child(5) {
    padding: 0.8rem 0 1.4rem 1.5rem;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    border-left: 0;
  }

  .method-track li::before {
    top: 1.15rem;
    left: -0.5rem;
  }

  .lens-grid article:nth-child(2),
  .lens-grid article:nth-child(3) {
    background: transparent;
  }

  .lens-grid article:nth-child(even) {
    background: var(--mint);
  }

  .lens-grid article {
    min-height: 18rem;
  }

  .audience-grid article {
    padding-right: 0;
    padding-left: 0;
  }

  .audience-grid article + article,
  .boundary-grid > div + div {
    border-top: 1px solid var(--border);
    border-left: 0;
  }

  .connection-list a {
    grid-template-columns: 2rem minmax(0, 1fr) auto;
  }

  footer nav {
    flex-wrap: wrap;
  }
}

@media (max-width: 390px) {
  h1 {
    font-size: clamp(3.15rem, 16vw, 4rem);
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .bridge-figure figcaption {
    gap: 0.4rem;
    justify-content: space-between;
    padding: 0.75rem 0.55rem;
    font-size: 0.52rem;
  }

  .bridge-label strong {
    font-size: 1rem;
  }
}

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