:root {
  --ink: #112a32;
  --river-deep: #164b55;
  --river: #0d7d78;
  --rust: #c25331;
  --sand: #e9dcc2;
  --paper: #f7f1e5;
  --foam: #fffdf8;
  --line: rgba(17, 42, 50, 0.2);
  --display: "Arial Narrow", "Roboto Condensed", "Helvetica Neue", sans-serif;
  --body: "Avenir Next", "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse at 10% 18%, transparent 0 46px, rgba(13, 125, 120, 0.09) 47px 48px, transparent 49px 68px, rgba(13, 125, 120, 0.06) 69px 70px, transparent 71px),
    radial-gradient(ellipse at 91% 66%, transparent 0 72px, rgba(194, 83, 49, 0.07) 73px 74px, transparent 75px 98px, rgba(194, 83, 49, 0.05) 99px 100px, transparent 101px);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.72;
}

a {
  color: var(--river-deep);
  text-decoration-color: var(--rust);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: var(--rust);
}

:focus-visible {
  outline: 3px solid var(--rust);
  outline-offset: 4px;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  color: var(--foam);
  background: var(--ink);
  transform: translateY(-180%);
}

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

.reading-progress {
  position: fixed;
  z-index: 50;
  inset: 0 0 auto;
  height: 4px;
  background: transparent;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--rust);
}

.page-shell {
  width: min(1440px, 100%);
  min-width: 0;
  margin-inline: auto;
  overflow: hidden;
  background: rgba(247, 241, 229, 0.9);
  box-shadow: 0 0 0 1px rgba(17, 42, 50, 0.08);
}

.status-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.35rem 1.5rem;
  padding: 0.5rem clamp(1rem, 4vw, 4rem);
  color: var(--foam);
  background: var(--ink);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.35;
  text-transform: uppercase;
}

.status-strip span:last-child {
  color: #b8e3db;
}

.site-header {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem 2.4rem;
  padding: 1.2rem clamp(1rem, 4vw, 4rem);
  border-bottom: 1px solid var(--line);
  background: var(--foam);
}

.brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.85rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  place-content: center;
  overflow: hidden;
  background: var(--river);
  clip-path: polygon(0 0, 100% 0, 100% 78%, 78% 100%, 0 100%);
}

.brand-mark i {
  display: block;
  width: 29px;
  height: 5px;
  margin: 2px;
  border-radius: 100% 0 100% 0;
  background: var(--foam);
  transform: skewX(-24deg);
}

.brand strong,
.brand small {
  display: block;
  line-height: 1;
}

.brand strong {
  font-family: var(--display);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 900;
  letter-spacing: -0.025em;
  text-transform: uppercase;
}

.brand small {
  margin-top: 0.28rem;
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 1rem;
}

.site-nav a {
  position: relative;
  padding: 0.35rem 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  line-height: 1.25;
  text-decoration: none;
  text-transform: uppercase;
  white-space: normal;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--rust);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.page-intro {
  display: grid;
  grid-template-columns: minmax(80px, 0.7fr) minmax(260px, 3fr) minmax(360px, 5.2fr);
  min-width: 0;
  align-items: stretch;
  gap: clamp(1.2rem, 3vw, 3.2rem);
  padding: clamp(2.4rem, 6vw, 6.5rem) clamp(1rem, 5vw, 5rem) clamp(2rem, 5vw, 4rem);
  background:
    linear-gradient(90deg, rgba(13, 125, 120, 0.09) 1px, transparent 1px),
    linear-gradient(rgba(13, 125, 120, 0.07) 1px, transparent 1px);
  background-size: 42px 42px;
}

.section-code {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: space-between;
  border-left: 7px solid var(--river);
  padding-left: 0.8rem;
}

.section-code span {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.section-code b {
  color: var(--rust);
  font-family: var(--display);
  font-size: clamp(2.8rem, 7vw, 6.8rem);
  line-height: 0.72;
}

.intro-copy {
  align-self: center;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.deck {
  max-width: 25ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.55rem, 3.3vw, 3rem);
  font-weight: 850;
  letter-spacing: -0.035em;
  line-height: 1.04;
}

.feature-image {
  position: relative;
  align-self: center;
  margin: 0 0 1.25rem;
}

.feature-image::before {
  position: absolute;
  z-index: 0;
  inset: 1rem -1rem -1rem 1rem;
  background: var(--rust);
  content: "";
  clip-path: polygon(0 0, 100% 0, 100% 87%, 92% 100%, 0 100%);
}

.feature-image img {
  position: relative;
  z-index: 1;
  width: 100%;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--ink);
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 87%, 92% 100%, 0 100%);
}

.feature-image--wide img {
  aspect-ratio: 16 / 9;
}

.feature-image figcaption {
  position: relative;
  z-index: 2;
  display: flex;
  gap: 0.7rem;
  margin: 0.6rem 0 0 1rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-transform: uppercase;
}

.feature-image figcaption span {
  color: var(--rust);
}

.text-plate {
  position: relative;
  align-self: center;
  min-height: 270px;
  padding: clamp(1.5rem, 4vw, 3.5rem);
  color: var(--foam);
  background-color: var(--river-deep);
  background-image: repeating-radial-gradient(ellipse at 90% 20%, transparent 0 22px, rgba(255, 255, 255, 0.08) 23px 24px, transparent 25px 38px);
  box-shadow: 1rem 1rem 0 var(--rust);
  clip-path: polygon(0 0, 100% 0, 100% 83%, 91% 100%, 0 100%);
}

.text-plate span {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.text-plate p {
  max-width: 24ch;
  margin: 3rem 0 0;
  font-family: var(--display);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 850;
  line-height: 1.05;
}

.independence-note {
  display: grid;
  grid-template-columns: minmax(150px, 0.75fr) minmax(260px, 4fr);
  gap: 1rem 2rem;
  margin: 0 clamp(1rem, 5vw, 5rem);
  padding: 1.1rem 1.4rem;
  border: 1px solid var(--ink);
  border-left: 8px solid var(--rust);
  background: var(--sand);
}

.independence-note strong {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.independence-note p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.55;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(150px, 0.9fr) minmax(0, 3.8fr);
  gap: clamp(2rem, 6vw, 7rem);
  max-width: 1120px;
  margin-inline: auto;
  padding: clamp(3.5rem, 8vw, 8rem) clamp(1rem, 5vw, 5rem);
}

.margin-guide {
  align-self: start;
  border-top: 5px solid var(--river);
  padding-top: 1rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  line-height: 1.5;
  text-transform: uppercase;
}

.margin-guide > span {
  color: var(--rust);
  font-weight: 800;
  letter-spacing: 0.1em;
}

.margin-guide ol {
  margin: 1.5rem 0;
  padding: 0;
  list-style: none;
  counter-reset: protocol;
}

.margin-guide li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.4rem;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--line);
  counter-increment: protocol;
}

.margin-guide li::before {
  color: var(--river);
  font-weight: 900;
  content: "0" counter(protocol);
}

.margin-guide p {
  text-transform: none;
}

.article-body {
  min-width: 0;
  counter-reset: heading;
}

.article-body h1 {
  max-width: 17ch;
  margin: 0 0 1.6rem;
  font-family: var(--display);
  font-size: clamp(3rem, 7vw, 6.6rem);
  font-weight: 900;
  letter-spacing: -0.055em;
  line-height: 0.9;
  text-transform: uppercase;
}

.article-body h1::after {
  display: block;
  width: 4.5rem;
  height: 9px;
  margin-top: 1.35rem;
  background: var(--rust);
  content: "";
}

.article-body h2 {
  position: relative;
  margin: 3.2rem 0 0.8rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-family: var(--display);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-weight: 880;
  letter-spacing: -0.03em;
  line-height: 1.08;
  counter-increment: heading;
}

.article-body h2::before {
  display: inline-block;
  min-width: 2.2rem;
  margin-right: 0.55rem;
  color: var(--river);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  vertical-align: 0.32em;
  content: "§0" counter(heading);
}

.article-body p,
.article-body li {
  max-width: 68ch;
}

.article-body > p:first-of-type {
  max-width: 58ch;
  color: var(--river-deep);
  font-family: var(--display);
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  font-weight: 620;
  line-height: 1.35;
}

.article-body ol,
.article-body ul {
  margin: 1.5rem 0 2rem;
  padding-left: 1.35rem;
}

.article-body li {
  margin: 0.55rem 0;
  padding-left: 0.35rem;
}

.article-body strong {
  color: var(--river-deep);
}

.article-body a[target="_blank"]::after {
  display: inline-block;
  margin-left: 0.18em;
  font-family: var(--mono);
  font-size: 0.6em;
  text-decoration: none;
  content: "↗";
}

.related-notes {
  padding: clamp(2.8rem, 6vw, 5rem) clamp(1rem, 5vw, 5rem);
  color: var(--foam);
  background: var(--river-deep);
}

.related-notes > div {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.related-notes a {
  display: flex;
  min-width: 0;
  min-height: 8rem;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem;
  border-right: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--foam);
  font-family: var(--display);
  font-size: clamp(1.15rem, 2vw, 1.6rem);
  font-weight: 800;
  line-height: 1.1;
  text-decoration: none;
}

.related-notes a:hover {
  color: #c6eee7;
  background: rgba(255, 255, 255, 0.05);
}

.related-notes a span {
  color: #b8e3db;
  font-family: var(--mono);
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.site-footer {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 2fr;
  gap: 2rem;
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1rem, 5vw, 5rem);
  border-top: 9px solid var(--rust);
  background: var(--ink);
  color: rgba(255, 253, 248, 0.78);
}

.footer-mark span {
  display: grid;
  width: 4rem;
  height: 4rem;
  place-items: center;
  color: var(--foam);
  background: var(--river);
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 900;
  clip-path: polygon(0 0, 100% 0, 100% 75%, 75% 100%, 0 100%);
}

.footer-mark p {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-footer h2 {
  margin: 0 0 1rem;
  color: #b8e3db;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-footer a {
  display: block;
  margin: 0.5rem 0;
  color: var(--foam);
  font-size: 0.82rem;
  text-decoration-color: var(--river);
}

.footer-notice {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.65;
}

.error-page {
  min-height: 62vh;
  padding: clamp(4rem, 10vw, 9rem) clamp(1rem, 8vw, 8rem);
  background:
    linear-gradient(120deg, rgba(13, 125, 120, 0.12), transparent 55%),
    var(--paper);
}

.error-code {
  color: var(--rust);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.error-page h1 {
  max-width: 13ch;
  margin: 1.2rem 0;
  font-family: var(--display);
  font-size: clamp(3.5rem, 9vw, 8rem);
  font-weight: 900;
  letter-spacing: -0.06em;
  line-height: 0.88;
  text-transform: uppercase;
}

.error-page > p:not(.error-code) {
  max-width: 62ch;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin: 2rem 0 4rem;
}

.button {
  padding: 0.8rem 1.1rem;
  border: 2px solid var(--ink);
  color: var(--foam);
  background: var(--ink);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.error-page .independence-note {
  margin: 0;
}

@media (max-width: 940px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .page-intro {
    grid-template-columns: 70px minmax(0, 1fr);
  }

  .feature-image,
  .text-plate {
    grid-column: 2;
  }

  .site-footer {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  body {
    font-size: 16px;
  }

  .status-strip {
    display: block;
  }

  .status-strip span {
    display: block;
  }

  .status-strip span + span {
    margin-top: 0.25rem;
  }

  .site-header {
    gap: 1rem;
    padding-block: 1rem;
  }

  .site-nav {
    gap: 0.25rem 0.8rem;
  }

  .site-nav a {
    font-size: 0.72rem;
  }

  .page-intro {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 1rem;
  }

  .section-code {
    padding-left: 0.5rem;
  }

  .section-code b {
    font-size: 2.6rem;
  }

  .feature-image::before,
  .text-plate {
    box-shadow: 0.55rem 0.55rem 0 var(--rust);
  }

  .feature-image::before {
    inset: 0.55rem -0.55rem -0.55rem 0.55rem;
  }

  .text-plate {
    min-height: 220px;
  }

  .independence-note {
    grid-template-columns: 1fr;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .margin-guide {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 0.5rem 1rem;
  }

  .margin-guide ol {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 0;
  }

  .margin-guide p {
    grid-column: 1 / -1;
  }

  .article-body h1 {
    font-size: clamp(2.7rem, 15vw, 4.6rem);
  }

  .related-notes > div {
    grid-template-columns: 1fr;
  }

  .related-notes a {
    min-height: 6rem;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  }

  .site-footer {
    grid-template-columns: 1fr;
  }
}

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

  * {
    transition-duration: 0.001ms !important;
  }
}

@media print {
  .status-strip,
  .site-header,
  .reading-progress,
  .related-notes,
  .site-footer {
    display: none;
  }

  body,
  .page-shell {
    background: white;
    box-shadow: none;
  }

  .page-intro,
  .article-layout {
    display: block;
    padding: 1rem 0;
  }

  .section-code,
  .intro-copy,
  .margin-guide {
    display: none;
  }

  .feature-image {
    max-width: 7in;
  }
}