:root {
  color-scheme: light;
  --bg: #f7fbff;
  --panel: #ffffff;
  --ink: #122033;
  --muted: #526274;
  --line: #dbe7f3;
  --blue: #0b66d8;
  --blue-dark: #084fa7;
  --soft: #eaf4ff;
  --amber-soft: #fff6df;
  --green-soft: #eafaf3;
  --shadow: 0 18px 45px rgba(22, 44, 70, 0.10);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(11, 102, 216, 0.11), transparent 34rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 42%, #ffffff 100%);
  color: var(--ink);
  line-height: 1.68;
}

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

a {
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--blue-dark);
  text-decoration: underline;
}

.hero,
.panel,
.sample,
.faq {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
}

.hero {
  padding: 58px 28px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5.8vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 3vw, 2.25rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}

p {
  margin: 0 0 18px;
}

.lede {
  max-width: 780px;
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 1.14rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 850;
}

.button.primary {
  background: var(--blue);
  color: #ffffff;
  border-color: var(--blue);
}

.button.secondary {
  background: #ffffff;
  color: var(--blue);
}

.panel,
.sample,
.faq {
  margin-top: 28px;
  padding: 28px;
}

.panel p,
.sample p,
.faq p,
li {
  color: var(--muted);
}

.bowtie-map {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
  margin-top: 28px;
}

.bowtie-map article,
.answer-grid > div,
.mistake-grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #ffffff;
  box-shadow: 0 12px 28px rgba(22, 44, 70, 0.06);
}

.bowtie-map span {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bowtie-map .center {
  background: var(--soft);
}

.steps {
  margin: 0;
  padding-left: 1.25rem;
}

.steps li + li {
  margin-top: 10px;
}

.disclaimer {
  padding: 12px 14px;
  border-radius: 16px;
  background: var(--amber-soft);
  border: 1px solid #f1d88a;
}

.scenario {
  margin-top: 18px;
  padding: 20px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: #fbfdff;
}

.answer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-top: 18px;
}

.answer-grid > div:first-child {
  background: var(--green-soft);
}

.mistake-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.reference-links {
  display: grid;
  gap: 12px;
}

.reference-links a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fbfdff;
}

details {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fbfdff;
  padding: 16px 18px;
}

details + details {
  margin-top: 12px;
}

summary {
  cursor: pointer;
  font-weight: 850;
}

summary + p {
  margin-top: 12px;
}

@media (max-width: 900px) {
  .bowtie-map,
  .answer-grid,
  .mistake-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 42px 20px;
  }

  main {
    width: min(100% - 24px, 1120px);
    padding-top: 28px;
  }
}