:root {
  --bg: #fbfbf8;
  --surface: #ffffff;
  --surface-soft: #f6f9ff;
  --text: #111111;
  --muted: #5e6470;
  --line: #e5e7eb;
  --accent: #3d76f6;
  --accent-soft: #dce7ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Nunito', Arial, sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.site-shell {
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 28px;
}

.brand-link,
.utility-link,
.inline-link,
.footer-link {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.brand-link,
.utility-link {
  font-size: 14px;
}

.utility-nav {
  display: flex;
  gap: 18px;
  align-items: center;
  color: var(--muted);
}

.hero {
  max-width: 760px;
  margin: 0 auto;
  padding: 36px 24px 80px;
  text-align: center;
}

.hero-logo-wrap {
  width: 120px;
  height: 120px;
  margin: 0 auto 28px;
  border-radius: 28px;
  background: #e8f0ff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-logo,
.doc-logo {
  display: block;
}

.hero-logo {
  width: 84px;
  height: 84px;
  border-radius: 22px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(40px, 7vw, 54px);
  line-height: 1.05;
}

.hero p {
  margin: 0 auto;
  max-width: 620px;
  font-size: 22px;
  color: #3b3f47;
}

.primary-cta {
  display: inline-block;
  margin-top: 36px;
  padding: 16px 24px;
  border-radius: 18px;
  background: var(--text);
  color: #ffffff;
  text-decoration: none;
  font-size: 18px;
  font-weight: 700;
}

.section-stack {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 88px;
}

.info-card,
.grid-card,
.highlight-card,
.doc-shell {
  background: var(--surface);
  border: 1px solid var(--line);
}

.info-card,
.highlight-card {
  border-radius: 28px;
  padding: 32px 36px;
}

.info-card {
  margin-bottom: 56px;
}

.section-title {
  margin: 0 0 14px;
  font-size: 28px;
  line-height: 1.15;
}

.section-copy,
.highlight-copy,
.doc-copy,
.doc-list,
.doc-shell p,
.doc-shell li {
  color: #3b3f47;
  font-size: 18px;
}

.section-copy,
.highlight-copy,
.doc-shell p,
.doc-shell ul {
  margin: 0;
}

.grid-title {
  margin: 0 0 22px;
  font-size: 32px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 56px;
}

.grid-card {
  border-radius: 24px;
  padding: 28px;
}

.grid-card h3 {
  margin: 0 0 12px;
  font-size: 22px;
}

.grid-card p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.highlight-card {
  background: var(--surface-soft);
  border-color: var(--accent-soft);
}

.highlight-card h2 {
  margin: 0 0 12px;
  font-size: 28px;
}

.support-line {
  margin-top: 16px;
  color: var(--muted);
  font-size: 16px;
}

.doc-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.doc-shell {
  border-radius: 32px;
  padding: 34px 40px 40px;
}

.doc-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 34px;
}

.doc-logo {
  width: 52px;
  height: 52px;
  border-radius: 14px;
}

.doc-header h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.15;
}

.doc-meta {
  margin-top: 6px;
  color: var(--muted);
  font-size: 16px;
}

.doc-section {
  margin-top: 34px;
}

.doc-section h2 {
  margin: 0 0 12px;
  font-size: 26px;
  line-height: 1.2;
}

.doc-section p + p,
.doc-section ul,
.doc-section p + ul {
  margin-top: 12px;
}

.doc-list {
  padding-left: 22px;
}

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

.doc-callout {
  margin-top: 18px;
  border: 1px solid var(--accent-soft);
  background: var(--surface-soft);
  border-radius: 22px;
  padding: 18px 20px;
}

.doc-callout strong {
  display: block;
  margin-bottom: 6px;
}

.doc-divider {
  margin: 38px 0 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.doc-contact {
  margin-top: 28px;
}

.footer-note {
  padding: 0 24px 30px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 720px) {
  .topbar {
    padding: 20px 18px;
  }

  .utility-nav {
    gap: 12px;
    font-size: 13px;
  }

  .hero,
  .section-stack,
  .doc-wrap {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero {
    padding-top: 20px;
    padding-bottom: 64px;
  }

  .hero p {
    font-size: 20px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .info-card,
  .highlight-card,
  .grid-card,
  .doc-shell {
    padding-left: 22px;
    padding-right: 22px;
  }

  .doc-header {
    align-items: flex-start;
  }

  .doc-header h1 {
    font-size: 28px;
  }
}