.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px max(16px, calc((100vw - 1120px) / 2));
  background: rgba(243, 247, 251, 0.96);
  border-bottom: 1px solid rgba(216, 226, 238, 0.9);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: #fff;
  background: var(--check-primary);
  border-radius: 10px;
  box-shadow: 0 10px 22px rgba(30, 58, 95, 0.20);
  font-weight: 950;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  color: var(--check-primary);
  font-size: 1.02rem;
  line-height: 1.15;
}

.brand small {
  color: var(--check-muted);
  font-size: 0.74rem;
  line-height: 1.2;
}

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

.site-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 7px 12px;
  color: var(--check-primary);
  background: #fff;
  border: 1px solid var(--check-border);
  border-radius: 999px;
  box-shadow: 0 1px 0 rgba(17, 24, 39, 0.04);
  font-weight: 850;
}

.site-nav a:hover {
  color: var(--check-blue);
  border-color: rgba(37, 99, 235, 0.32);
}

.hero-band {
  padding: 48px 0 58px;
  background: var(--check-bg);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.92fr) minmax(360px, 1.08fr);
  gap: 30px;
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.hero-title {
  max-width: 12.4em;
  margin-bottom: 18px;
  color: var(--check-primary);
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.048em;
}

.hero-title span {
  color: var(--check-blue);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.hero-panel {
  min-width: 0;
}

.content-band {
  padding: 58px 0;
  background: #fff;
  border-top: 1px solid rgba(216, 226, 238, 0.7);
}

.content-band.muted {
  background: var(--check-surface-soft);
}

.content-band.compact {
  padding: 44px 0;
}

.section-intro {
  max-width: 780px;
  margin-bottom: 26px;
}

.section-intro.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-intro h2,
.page-shell h1 {
  margin-bottom: 10px;
  color: var(--check-primary);
  font-size: clamp(1.72rem, 3vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: -0.035em;
}

.section-intro p {
  color: var(--check-muted);
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.compact-gap {
  gap: 18px;
}

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

.page-shell {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 58px 0 74px;
}

.page-card {
  padding: 28px;
  background: var(--check-surface);
  border: 1px solid var(--check-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--check-shadow-soft);
}

.page-card + .page-card {
  margin-top: 18px;
}

.site-footer {
  padding: 34px 0;
  color: #cbd5e1;
  background: #101820;
  border-top: 1px solid #26313d;
}

.site-footer strong,
.site-footer a {
  color: #f8fafc;
}

.site-footer p {
  margin-bottom: 0;
}

.footer-grid {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.footer-note {
  max-width: 660px;
}

@media (max-width: 940px) {
  .hero-grid,
  .two-column,
  .three-column {
    grid-template-columns: 1fr;
  }

  .hero-band {
    padding-top: 34px;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
  }

  .site-header {
    position: static;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 2px;
  }

  .site-nav a {
    flex: 0 0 auto;
  }

  .hero-title {
    font-size: clamp(2.1rem, 10vw, 3rem);
  }

  .content-band {
    padding: 42px 0;
  }

  .page-card {
    padding: 22px;
    border-radius: 22px;
  }

  .footer-grid {
    flex-direction: column;
  }
}