:root {
  color-scheme: light;
  --ink: #15211c;
  --muted: #52625a;
  --paper: #f6f5ef;
  --surface: #fffef9;
  --line: #d8ded8;
  --green: #176b4d;
  --blue: #315f7d;
  --amber: #805d24;
  --shadow: 0 20px 50px rgba(31, 47, 39, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

a {
  color: var(--green);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10;
  padding: 0.65rem 0.9rem;
  border-radius: 0.4rem;
  background: var(--ink);
  color: #fff;
  transform: translateY(-180%);
}

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

.page-header {
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  background:
    radial-gradient(circle at 82% 12%, rgba(114, 192, 155, 0.28), transparent 28rem),
    linear-gradient(135deg, #12281f 0%, #194735 55%, #1b5640 100%);
  color: #f8fbf9;
}

.header-inner,
main,
footer {
  width: min(72rem, calc(100% - 3rem));
  margin-inline: auto;
}

.header-inner {
  padding: clamp(4rem, 9vw, 7.5rem) 0 2rem;
}

.eyebrow,
.section-label,
.card-kicker {
  margin: 0 0 0.7rem;
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow {
  color: #b9e4cf;
}

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

h1,
h2,
h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
  line-height: 1.12;
}

h1 {
  max-width: 13ch;
  margin-bottom: 1.4rem;
  font-size: clamp(2.8rem, 7vw, 5.6rem);
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 1.25rem;
  font-size: clamp(2rem, 4vw, 3.25rem);
  letter-spacing: -0.025em;
}

h3 {
  margin-bottom: 0.7rem;
  font-size: 1.5rem;
}

.lede {
  max-width: 47rem;
  margin-bottom: 3rem;
  color: #d7e8df;
  font-size: clamp(1.1rem, 2.1vw, 1.35rem);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

nav a {
  padding: 0.48rem 0.78rem;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  color: #f8fbf9;
  font-size: 0.9rem;
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible {
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.08);
}

main {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

main > section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
}

main > section:last-child {
  border-bottom: 0;
}

.section-label {
  color: var(--green);
}

.summary {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(20rem, 1.1fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: end;
}

.summary h2,
.summary p {
  margin-bottom: 0;
}

.summary > p {
  color: var(--muted);
  font-size: 1.16rem;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

footer div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.boundary-card,
.prose-card,
.retention-list > div {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.boundary-card {
  min-height: 23rem;
  padding: 1.7rem;
}

.boundary-card ul {
  margin: 1.35rem 0 0;
  padding-left: 1.2rem;
}

.boundary-card li + li {
  margin-top: 0.65rem;
}

.card-kicker {
  display: block;
}

.local-card {
  border-top: 5px solid var(--green);
}

.local-card .card-kicker {
  color: var(--green);
}

.sync-card {
  border-top: 5px solid var(--blue);
}

.sync-card .card-kicker {
  color: var(--blue);
}

.server-card {
  border-top: 5px solid var(--amber);
}

.server-card .card-kicker {
  color: var(--amber);
}

.control-list {
  display: grid;
  gap: 1rem;
}

.control-list article {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.4rem 0;
  border-top: 1px solid var(--line);
}

.control-list article > span {
  color: var(--green);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.6rem;
}

.control-list p {
  max-width: 54rem;
  margin-bottom: 0;
  color: var(--muted);
}

.prose-card {
  max-width: 60rem;
  padding: clamp(1.5rem, 4vw, 2.4rem);
}

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

.retention-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 0;
}

.retention-list > div {
  padding: 1.5rem;
}

.retention-list dt {
  margin-bottom: 0.75rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.25;
}

.retention-list dd {
  margin: 0;
  color: var(--muted);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 2.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

footer strong {
  color: var(--ink);
}

@media (max-width: 56rem) {
  .boundary-grid,
  .retention-list {
    grid-template-columns: 1fr;
  }

  .boundary-card {
    min-height: 0;
  }

  .summary {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 40rem) {
  .header-inner,
  main,
  footer {
    width: min(100% - 1.5rem, 72rem);
  }

  .header-inner {
    padding-top: 3.25rem;
  }

  h1 {
    font-size: clamp(2.6rem, 14vw, 4rem);
  }

  nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  nav a {
    text-align: center;
  }

  .control-list article {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.6rem;
  }

  footer {
    flex-direction: column;
  }
}

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