:root {
  --color-ink: #1e2a3a;
  --color-text: #273342;
  --color-muted: #647184;
  --color-surface: #ffffff;
  --color-page: #f6f7f9;
  --color-line: #d9dee7;
  --color-teal: #28766f;
  --color-plum: #8e3f56;
  --color-gold: #c99a2e;
  --shadow-soft: 0 18px 44px rgba(30, 42, 58, 0.1);
  --content-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-page);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px max(24px, calc((100vw - var(--content-width)) / 2));
  background: rgba(246, 247, 249, 0.94);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: blur(18px);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--color-ink);
  font-weight: 760;
  text-decoration: none;
}

.brand-link img {
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
  font-size: 0.94rem;
}

.nav-links a {
  padding: 8px 10px;
  border-radius: 8px;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-ink);
  background: #e9edf3;
  outline: none;
}

.hero {
  display: flex;
  min-height: 74vh;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 72px 24px 88px;
  text-align: center;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.hero-logo {
  width: 112px;
  height: 112px;
  margin-bottom: 22px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--color-plum);
  font-size: 0.78rem;
  font-weight: 780;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  color: var(--color-ink);
  font-size: 4.25rem;
  line-height: 1;
  font-weight: 820;
}

.hero-copy {
  width: min(720px, 100%);
  margin: 24px auto 0;
  color: var(--color-text);
  font-size: 1.24rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 720;
  line-height: 1.2;
  text-decoration: none;
}

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

.button-primary:hover,
.button-primary:focus-visible {
  background: #2a394d;
  outline: none;
}

.button-secondary {
  color: var(--color-ink);
  background: #ffffff;
  border-color: var(--color-line);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--color-ink);
  outline: none;
}

.section {
  padding: 74px 24px;
}

.section-inner {
  width: min(var(--content-width), 100%);
  margin: 0 auto;
}

.two-column,
.detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: start;
}

.section h2 {
  max-width: 760px;
  margin: 0;
  color: var(--color-ink);
  font-size: 2.2rem;
  line-height: 1.16;
  font-weight: 780;
}

.section p {
  margin: 0;
  color: var(--color-text);
}

.intro-section {
  background: var(--color-page);
}

.feature-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  min-height: 232px;
  padding: 24px;
  background: #f9fafc;
  border: 1px solid var(--color-line);
  border-radius: 8px;
}

.feature-card:nth-child(2) {
  border-top-color: var(--color-teal);
}

.feature-card:nth-child(3) {
  border-top-color: var(--color-plum);
}

.feature-card:nth-child(4) {
  border-top-color: var(--color-gold);
}

.feature-card h3 {
  margin: 0 0 12px;
  color: var(--color-ink);
  font-size: 1.08rem;
  line-height: 1.25;
}

.feature-card p {
  color: var(--color-muted);
  font-size: 0.98rem;
}

.detail-section {
  background: var(--color-page);
}

.check-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 16px 18px 16px 48px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(30, 42, 58, 0.05);
}

.check-list li::before {
  position: absolute;
  top: 16px;
  left: 18px;
  width: 18px;
  height: 18px;
  color: #ffffff;
  background: var(--color-teal);
  border-radius: 50%;
  content: "";
}

.check-list li::after {
  position: absolute;
  top: 20px;
  left: 23px;
  width: 7px;
  height: 4px;
  border-bottom: 2px solid #ffffff;
  border-left: 2px solid #ffffff;
  content: "";
  transform: rotate(-45deg);
}

.contact-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.contact-panel {
  max-width: 760px;
  padding: 40px;
  background: #f8fafb;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.contact-panel h2 {
  margin-bottom: 16px;
}

.contact-panel p {
  margin-bottom: 24px;
  color: var(--color-muted);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 24px max(24px, calc((100vw - var(--content-width)) / 2));
  color: #dce3ec;
  background: var(--color-ink);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.footer-links a {
  color: inherit;
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  text-decoration: underline;
  outline: none;
}

.document-main {
  background: var(--color-page);
}

.document-section {
  padding: 66px 24px 86px;
}

.document-prose {
  max-width: 820px;
}

.document-prose h1,
.document-prose h2 {
  color: var(--color-ink);
  line-height: 1.18;
}

.document-prose h1 {
  margin: 0;
  font-size: 3rem;
  font-weight: 820;
}

.document-prose h2 {
  margin: 40px 0 12px;
  font-size: 1.42rem;
  font-weight: 780;
}

.document-prose p,
.document-prose li {
  color: var(--color-text);
  font-size: 1rem;
}

.document-prose p {
  margin: 0 0 18px;
}

.document-prose ul {
  margin: 0 0 18px;
  padding-left: 1.3rem;
}

.document-prose a {
  color: var(--color-teal);
  font-weight: 680;
}

.document-updated {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 0.94rem;
}

@media (max-width: 900px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: auto;
    padding-top: 56px;
    padding-bottom: 68px;
  }

  .hero h1 {
    font-size: 3.3rem;
  }

  .hero-copy {
    font-size: 1.08rem;
  }

  .two-column,
  .detail-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .site-header,
  .section,
  .hero,
  .site-footer {
    padding-right: 18px;
    padding-left: 18px;
  }

  .nav-links {
    gap: 4px;
    font-size: 0.9rem;
  }

  .hero-logo {
    width: 88px;
    height: 88px;
  }

  .hero h1 {
    font-size: 2.62rem;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

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

  .feature-card {
    min-height: auto;
  }

  .section h2 {
    font-size: 1.72rem;
  }

  .contact-panel {
    padding: 26px;
  }

  .document-section {
    padding: 46px 18px 66px;
  }

  .document-prose h1 {
    font-size: 2.18rem;
  }
}