:root {
  --bg: #f4f7f5;
  --ink: #121a17;
  --muted: #5f6f68;
  --line: #dce5df;
  --accent: #008b7c;
  --accent-dark: #00695f;
  --gold: #f5b83d;
  --panel: #fffdf8;
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
}

a {
  color: inherit;
}

.topbar,
.hero,
.content,
.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
}

.mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: var(--radius);
  color: #132520;
  background: #fff;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.nav a {
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.55fr);
  gap: 38px;
  align-items: center;
  padding: 56px 0 38px;
}

.eyebrow {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

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

h1 {
  margin-top: 12px;
  font-size: clamp(2.5rem, 6vw, 5.4rem);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-top: 34px;
  font-size: clamp(1.45rem, 2.3vw, 2rem);
  line-height: 1.1;
  letter-spacing: 0;
}

h3 {
  margin-top: 24px;
  font-size: 1.08rem;
}

p,
li {
  color: var(--muted);
  line-height: 1.7;
}

.lead {
  max-width: 64ch;
  margin-top: 18px;
  font-size: 1.08rem;
}

.cta-card,
.note,
.toc {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.cta-card {
  padding: 22px;
  box-shadow: 0 18px 44px rgba(18, 26, 23, 0.1);
}

.cta-card p {
  margin-top: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  margin-top: 18px;
  padding: 0 18px;
  border-radius: var(--radius);
  color: #06201c;
  background: linear-gradient(135deg, #55f6df, var(--gold));
  font-weight: 900;
  text-decoration: none;
}

.content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 38px;
  align-items: start;
  padding-bottom: 54px;
}

.article {
  padding: 34px;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 14px 34px rgba(18, 26, 23, 0.08);
}

.article p,
.article ul,
.article ol {
  margin-top: 14px;
}

.article li + li {
  margin-top: 8px;
}

.note,
.toc {
  padding: 18px;
}

.toc {
  position: sticky;
  top: 18px;
}

.toc strong,
.note strong {
  display: block;
  margin-bottom: 10px;
}

.toc a {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  text-decoration: none;
}

.footer {
  padding: 26px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 860px) {
  .hero,
  .content {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}

@media (max-width: 560px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .article {
    padding: 22px;
  }
}