:root {
  --slate: #2c3338;
  --ocean: #0b3d4a;
  --depth: #1a6b7a;
  --marker: #f4f0e6;
  --flag: #e8c547;
  --foam: #d8e2e5;
  --pencil: #c5d0d4;
  --ink: #1a2226;
  --font-display: "Chivo Mono", ui-monospace, monospace;
  --font-body: "Spectral", Georgia, serif;
  --max: 68rem;
  --pad: clamp(1rem, 3vw, 2rem);
  --band: clamp(2.5rem, 6vw, 4.5rem);
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--ink);
  background:
    linear-gradient(180deg, #9eb8bf 0%, var(--foam) 28%, #eef3f4 70%, #e4ecee 100%);
  min-height: 100vh;
}

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

a {
  color: var(--ocean);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover { color: var(--depth); }

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ocean);
  color: var(--marker);
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip:focus { left: 0.5rem; top: 0.5rem; }

.shell {
  width: min(100% - 2 * var(--pad), var(--max));
  margin-inline: auto;
}

.mast {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--slate) 94%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--flag);
}

.mast__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--marker);
  text-decoration: none;
}

.wordmark__mark {
  width: 1.15rem;
  height: 1.35rem;
  border: 1.5px solid var(--flag);
  border-radius: 2px;
  background:
    repeating-linear-gradient(
      180deg,
      transparent 0 3px,
      color-mix(in srgb, var(--flag) 70%, transparent) 3px 4px
    );
}

.nav {
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav a {
  color: var(--pencil);
  text-decoration: none;
}

.nav a[aria-current="page"],
.nav a:hover {
  color: var(--flag);
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 80% at 85% 20%, rgba(26, 107, 122, 0.45), transparent 55%),
    linear-gradient(165deg, var(--ocean) 0%, #062830 55%, var(--slate) 100%);
  color: var(--marker);
  min-height: min(88vh, 42rem);
  display: grid;
  align-items: end;
  padding: var(--band) 0 calc(var(--band) * 1.1);
}

.hero__ruler {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: clamp(2.5rem, 6vw, 4rem);
  background: color-mix(in srgb, var(--slate) 80%, #000);
  border-right: 2px solid var(--flag);
  background-image: repeating-linear-gradient(
    180deg,
    transparent 0,
    transparent calc(10% - 1px),
    var(--flag) calc(10% - 1px),
    var(--flag) 10%
  );
  opacity: 0.9;
  animation: depth-pulse 8s ease-in-out infinite;
}

.hero__ruler span {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-display);
  font-size: 0.55rem;
  color: var(--flag);
  writing-mode: vertical-rl;
  letter-spacing: 0.12em;
}

.hero__grid {
  position: absolute;
  inset: 0 0 0 clamp(2.5rem, 6vw, 4rem);
  background-image:
    linear-gradient(rgba(244, 240, 230, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 240, 230, 0.06) 1px, transparent 1px);
  background-size: 2.25rem 2.25rem;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.55), transparent 85%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  padding-left: clamp(3rem, 7vw, 5rem);
  max-width: 48rem;
}

.hero__brand {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
  color: var(--flag);
  animation: slate-in 0.9s ease-out both;
}

.hero h1 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  line-height: 1.35;
  margin: 0 0 1rem;
  max-width: 36ch;
  animation: slate-in 0.9s ease-out 0.12s both;
}

.hero__stand {
  margin: 0 0 1.25rem;
  color: var(--foam);
  max-width: 42ch;
  animation: slate-in 0.9s ease-out 0.22s both;
}

.hero__stamp {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 1px dashed var(--flag);
  padding: 0.4rem 0.75rem;
  color: var(--flag);
  animation: slate-in 0.9s ease-out 0.32s both;
}

@keyframes slate-in {
  from { opacity: 0; transform: translateY(0.6rem); }
  to { opacity: 1; transform: none; }
}

@keyframes depth-pulse {
  0%, 100% { opacity: 0.75; }
  50% { opacity: 1; }
}

.panel {
  padding: var(--band) 0;
}

.panel--slate {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--slate) 8%, transparent), transparent),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 27px,
      color-mix(in srgb, var(--ocean) 8%, transparent) 27px,
      color-mix(in srgb, var(--ocean) 8%, transparent) 28px
    );
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--depth);
  margin: 0 0 0.5rem;
}

.panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 1.25rem;
  color: var(--ocean);
}

.lede p { margin: 0 0 0.9rem; max-width: 62ch; }

.library {
  display: grid;
  gap: 1rem;
}

.entry {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.25rem;
  padding: 1.15rem 1.25rem;
  background: color-mix(in srgb, var(--marker) 88%, white);
  border: 1px solid color-mix(in srgb, var(--ocean) 22%, transparent);
  border-left: 4px solid var(--flag);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--slate) 12%, transparent);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.entry:hover {
  transform: translateX(4px);
  border-left-color: var(--depth);
}

.entry__id {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ocean);
  margin: 0.2rem 0 0;
  white-space: nowrap;
}

.entry h3 {
  font-family: var(--font-body);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  line-height: 1.3;
}

.entry h3 a {
  color: var(--ink);
  text-decoration: none;
}

.entry h3 a:hover { color: var(--ocean); }

.entry p { margin: 0; color: color-mix(in srgb, var(--ink) 78%, transparent); }

.standards,
.not-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.standards li,
.not-list li {
  padding: 0.85rem 1rem 0.85rem 1.15rem;
  background: var(--marker);
  border-left: 3px solid var(--depth);
}

.faq details {
  border-bottom: 1px solid color-mix(in srgb, var(--ocean) 20%, transparent);
  padding: 0.85rem 0;
}

.faq summary {
  font-family: var(--font-display);
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--ocean);
}

.faq p { margin: 0.65rem 0 0; max-width: 58ch; }

.article__head {
  padding: var(--band) 0 0;
  background: linear-gradient(180deg, color-mix(in srgb, var(--ocean) 12%, transparent), transparent);
}

.article__head h1 {
  font-family: var(--font-body);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  margin: 0 0 0.5rem;
  color: var(--ocean);
}

.article__meta {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--depth);
}

.prose {
  max-width: 42rem;
}

.prose h2 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 2rem 0 0.75rem;
  color: var(--ocean);
}

.prose p,
.prose li { max-width: 62ch; }

.prose ul { padding-left: 1.2rem; }

.defs dt {
  font-family: var(--font-display);
  font-size: 0.85rem;
  margin-top: 1rem;
  color: var(--ocean);
}

.defs dd { margin: 0.25rem 0 0; }

.backlink {
  display: inline-block;
  margin-top: 2rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.colophon {
  margin-top: var(--band);
  padding: 1.5rem 0 2rem;
  background: var(--slate);
  color: var(--foam);
  border-top: 2px solid var(--flag);
}

.colophon a { color: var(--flag); text-decoration: none; }
.colophon a:hover { text-decoration: underline; }

.colophon__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.85rem;
}

.colophon__note,
.colophon p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--pencil);
}

@media (max-width: 640px) {
  .hero__content { padding-left: 3.25rem; }
  .entry { grid-template-columns: 1fr; }
  .nav { gap: 0.85rem; }
}