:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5b6472;
  --paper: #f7f4ef;
  --line: #d8d2c6;
  --accent: #0f766e;
  --dark: #0f172a;
  --white: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(15, 118, 110, .18), transparent 34rem),
    radial-gradient(circle at 90% 15%, rgba(37, 99, 235, .12), transparent 28rem),
    var(--paper);
  color: var(--ink);
}

a { color: inherit; }

.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  overflow-x: hidden;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 28px 0;
}

.brand,
.navlinks a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}

.navlinks {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--muted);
}

.hero {
  padding: 96px 0 84px;
  max-width: 1100px;
}

.kicker {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: 13px;
  font-weight: 800;
}

h1 {
  max-width: 1100px;
  margin: 18px 0 0;
  font-size: clamp(48px, 7.4vw, 96px);
  line-height: .93;
  letter-spacing: 0;
}

.lede {
  max-width: 780px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: clamp(19px, 2.2vw, 25px);
  line-height: 1.45;
}

.hero-actions,
.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--ink);
  text-decoration: none;
  font-weight: 800;
}

.primary {
  margin-top: 32px;
  background: var(--ink);
  color: var(--white);
}

.secondary {
  margin-top: 32px;
  background: transparent;
  color: var(--ink);
}

.bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-flow: dense;
  gap: 16px;
  padding: 54px 0 132px;
}

.card {
  min-height: 260px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .68);
  padding: 26px;
  transition: transform .5s ease, background .5s ease;
}

.card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, .95);
}

.card.wide { grid-column: span 2; }
.card.dark {
  background: var(--dark);
  color: var(--white);
}

.card span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.card.dark span { color: #5eead4; }

.card h2 {
  margin: 20px 0 14px;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.02;
}

.card p,
.long-form-guide p,
.long-form-guide li {
  color: var(--muted);
  line-height: 1.7;
  font-size: 18px;
}

.card.dark p,
.card.dark a { color: #e5eef6; }

.long-form-guide {
  display: grid;
  gap: 86px;
  padding-bottom: 140px;
}

.long-form-guide section {
  max-width: 860px;
}

.long-form-guide h2 {
  margin: 0 0 20px;
  font-size: clamp(34px, 5vw, 66px);
  line-height: 1;
}

.steps,
.checklist {
  padding-left: 24px;
}

.steps li,
.checklist li {
  margin-bottom: 18px;
}

details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}

summary {
  cursor: pointer;
  font-size: 20px;
  font-weight: 900;
}

.cta {
  margin-bottom: 80px;
  padding: 46px;
  background: var(--dark);
  color: var(--white);
}

.cta h2 {
  flex-basis: 100%;
  margin: 0;
  font-size: clamp(36px, 6vw, 76px);
  line-height: .98;
}

.cta p {
  max-width: 700px;
  color: #dbe5ef;
  font-size: 20px;
  line-height: 1.6;
}

.button.inverted {
  background: var(--white);
  color: var(--dark);
  border-color: var(--white);
}

@media (max-width: 880px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .bento { grid-template-columns: 1fr; }
  .card.wide { grid-column: span 1; }
  .hero { padding-top: 58px; }
}