:root {
  --ink: #102435;
  --muted: #526575;
  --paper: #f6f3eb;
  --card: #fffdf7;
  --river: #1e6779;
  --river-dark: #164451;
  --amber: #e29b3f;
  --line: #d9d6cc;
  --shadow: 0 18px 50px rgba(16, 36, 53, .12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

a { color: var(--river-dark); text-underline-offset: .2em; }
a:hover, a:focus-visible { color: #913f18; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--amber); outline-offset: 4px; }

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 20;
  padding: .65rem 1rem;
  color: #fff;
  background: var(--ink);
}
.skip-link:focus { top: 1rem; }

.shell { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 243, 235, .94);
  border-bottom: 1px solid rgba(16, 36, 53, .12);
  backdrop-filter: blur(14px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -.03em;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: #fff;
  background: var(--river-dark);
  border-radius: 50% 50% 45% 55%;
  font-size: 14px;
  letter-spacing: .04em;
}

.nav-links { display: flex; flex-wrap: wrap; gap: .45rem 1.25rem; }
.nav-links a { color: var(--ink); font-size: .94rem; font-weight: 650; text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--river); text-decoration: underline; text-decoration-thickness: 2px; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.25fr);
  gap: 3rem;
  align-items: center;
  min-height: 690px;
  padding-block: 64px 72px;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--river);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1, h2, h3 { margin-top: 0; line-height: 1.12; letter-spacing: -.035em; }
h1 { margin-bottom: 1.25rem; font-size: clamp(2.8rem, 6vw, 5.4rem); }
h2 { margin-bottom: 1rem; font-size: clamp(2rem, 4vw, 3.2rem); }
h3 { margin-bottom: .55rem; font-size: 1.35rem; }

.lede { max-width: 650px; color: var(--muted); font-size: 1.17rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: .65rem 1.2rem;
  border: 1px solid var(--river-dark);
  border-radius: 999px;
  color: #fff;
  background: var(--river-dark);
  font-weight: 750;
  text-decoration: none;
}
.button.secondary { color: var(--river-dark); background: transparent; }

.hero-media {
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 30px 30px 80px 30px;
  box-shadow: var(--shadow);
}
.hero-visual { min-width: 0; }
.hero-media img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.hero-caption { margin: .7rem 1rem 0; color: var(--muted); font-size: .78rem; }

.section { padding-block: 88px; }
.section.compact { padding-block: 64px; }
.section.tinted { background: #e9eee8; }
.section-head { max-width: 760px; margin-bottom: 2.5rem; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; }
.card {
  position: relative;
  min-height: 250px;
  padding: 1.55rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 8px 26px rgba(16,36,53,.06);
}
.card-kicker { display: block; margin-bottom: 2rem; color: var(--river); font-size: .75rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.card p { color: var(--muted); }
.card-link::after { content: " →"; }

.principles { display: grid; grid-template-columns: .75fr 1.25fr; gap: 4rem; }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: item; }
.steps li { position: relative; padding: 0 0 1.5rem 4rem; border-left: 1px solid var(--line); counter-increment: item; }
.steps li:last-child { border-left-color: transparent; }
.steps li::before {
  content: counter(item, decimal-leading-zero);
  position: absolute;
  left: -1.15rem;
  top: -.15rem;
  display: grid;
  width: 2.3rem;
  height: 2.3rem;
  place-items: center;
  color: #fff;
  background: var(--river-dark);
  border-radius: 50%;
  font-size: .7rem;
  font-weight: 800;
}

.page-head { padding-block: 88px 52px; border-bottom: 1px solid var(--line); }
.page-head h1 { max-width: 900px; font-size: clamp(2.6rem, 5vw, 4.6rem); }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: .45rem; margin-bottom: 1.5rem; color: var(--muted); font-size: .88rem; }
.breadcrumbs a { color: inherit; }

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 4rem; padding-block: 64px 96px; }
.prose { max-width: 760px; }
.prose h2 { margin-top: 3rem; font-size: 2rem; }
.prose h3 { margin-top: 2rem; }
.prose p, .prose li { color: #324858; }
.prose ul, .prose ol { padding-left: 1.35rem; }
.note {
  margin: 2rem 0;
  padding: 1.2rem 1.3rem;
  color: #23404b;
  background: #e5efec;
  border-left: 5px solid var(--river);
  border-radius: 0 14px 14px 0;
}

.sidebox {
  align-self: start;
  position: sticky;
  top: 104px;
  padding: 1.25rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
}
.sidebox h2 { font-size: 1rem; letter-spacing: 0; }
.sidebox ul { margin: 0; padding-left: 1.15rem; }
.sidebox li + li { margin-top: .55rem; }

.resource-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.4rem 1.6rem;
  color: #fff;
  background: var(--ink);
  border-radius: 20px;
}
.resource-strip p { margin: 0; }
.resource-strip a { color: #ffd895; }

.site-footer { padding-block: 34px; color: #63727c; border-top: 1px solid var(--line); font-size: .86rem; }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.footer-row p { margin: 0; }

.error-page { min-height: 100vh; display: grid; place-items: center; padding: 2rem; }
.error-card { width: min(680px, 100%); padding: 3rem; background: var(--card); border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow); }
.error-code { color: var(--river); font-size: .8rem; font-weight: 800; letter-spacing: .16em; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; gap: 2rem; }
  .hero-copy { order: 1; }
  .hero-visual { order: 2; }
  .hero-media { border-radius: 24px 24px 60px 24px; }
  .cards { grid-template-columns: 1fr 1fr; }
  .principles, .article-layout { grid-template-columns: 1fr; gap: 2rem; }
  .sidebox { position: static; }
}

@media (max-width: 650px) {
  body { font-size: 16px; }
  .shell { width: min(100% - 28px, 1160px); }
  .site-header { position: static; }
  .nav { align-items: flex-start; flex-direction: column; gap: .75rem; padding-block: 14px; }
  .nav-links { width: 100%; gap: .55rem 1rem; }
  .hero { padding-block: 42px 56px; }
  h1 { font-size: clamp(2.55rem, 15vw, 4rem); }
  .cards { grid-template-columns: 1fr; }
  .card { min-height: auto; }
  .section { padding-block: 64px; }
  .page-head { padding-block: 54px 38px; }
  .article-layout { padding-block: 42px 68px; }
  .resource-strip, .footer-row { align-items: flex-start; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .error-card { padding: 2rem 1.35rem; }
}

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