:root {
  --brand: #0077cc;
  --brand-dark: #075f9e;
  --text: #171717;
  --muted: #626262;
  --line: #dedede;
  --soft: #f6f7f8;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: #fff;
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--brand-dark);
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 3px solid rgba(0, 119, 204, 0.28);
  outline-offset: 3px;
}

.site-header {
  background: var(--soft);
  border-bottom: 1px solid var(--line);
}

.site-header-inner,
main,
.site-footer {
  width: min(100%, 920px);
  margin: 0 auto;
  padding-left: 22px;
  padding-right: 22px;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 18px;
  padding-bottom: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.back-link {
  white-space: nowrap;
}

main {
  padding-top: 38px;
  padding-bottom: 44px;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(32px, 6vw, 48px);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

h2 {
  margin: 36px 0 9px;
  font-size: 23px;
  line-height: 1.3;
}

h3 {
  margin: 0 0 5px;
  font-size: 18px;
  line-height: 1.35;
}

p,
li {
  font-size: 16px;
}

.lead {
  max-width: 72ch;
  margin: 0;
  color: #333;
  font-size: 19px;
}

.updated {
  margin: 0 0 26px;
  color: var(--muted);
}

.summary-card,
.callout {
  margin: 28px 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--soft);
}

.summary-card p,
.callout p {
  margin: 0;
}

.mode-grid,
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 0;
}

.info-card {
  padding: 17px 18px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
}

.info-card p {
  margin: 0;
  color: #3d3d3d;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 16px;
  padding: 9px 15px;
  border-radius: 8px;
  background: var(--brand-dark);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.button-link:hover {
  background: #064c7e;
}

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

.plain-list li {
  margin: 7px 0;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 10px;
  padding-top: 21px;
  padding-bottom: 32px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  .site-header-inner,
  main,
  .site-footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .site-header-inner {
    align-items: flex-start;
  }

  .back-link {
    margin-top: 10px;
    font-size: 14px;
  }

  main {
    padding-top: 30px;
  }

  .mode-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}