:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --soft: #f5f7fa;
  --line: #d9dee5;
  --ink: #1e2837;
  --muted: #5c6878;
  --accent: #1d5aa6;
  --accent-dark: #143d72;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
}

body {
  font-family: "Source Sans 3", sans-serif;
}

.site {
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

.topbar {
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-text strong,
.main-nav a,
.primary-link,
.secondary-link,
.download-button,
.support-box a {
  font-family: "PT Serif", serif;
}

.brand-text strong {
  font-size: 1rem;
}

.brand-text small {
  color: var(--muted);
  font-size: 0.82rem;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.main-nav a {
  color: var(--accent-dark);
  text-decoration: none;
  font-size: 0.95rem;
}

.content {
  padding-top: 30px;
}

.product-head {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 28px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.caption {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
}

h1,
h2,
h3,
p,
dt,
dd {
  margin: 0;
}

h1,
h2,
h3 {
  font-family: "PT Serif", serif;
}

h1 {
  max-width: 820px;
  font-size: clamp(2.8rem, 4.8vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.summary,
.list-row p,
.support-box p,
.download-row span,
.doc-lead,
.doc-block p {
  color: var(--muted);
  line-height: 1.72;
}

.summary {
  max-width: 760px;
  margin-top: 18px;
  font-size: 1.06rem;
}

.action-line {
  display: flex;
  gap: 20px;
  align-items: center;
  margin-top: 24px;
}

.primary-link,
.secondary-link,
.download-button,
.support-box a,
.doc-link {
  text-decoration: none;
  font-weight: 700;
}

.primary-link,
.download-button {
  color: #fff;
  background: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 10px;
}

.secondary-link,
.support-box a,
.doc-link {
  color: var(--accent-dark);
}

.product-side {
  padding: 24px;
  background: var(--soft);
  border: 1px solid var(--line);
}

.product-side h2 {
  margin-bottom: 16px;
  font-size: 1.7rem;
}

.download-table {
  display: grid;
  gap: 14px;
}

.download-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.download-row strong,
.list-row strong,
.support-box h3,
.doc-block h2 {
  font-family: "PT Serif", serif;
}

.download-button {
  width: 100%;
  margin-top: 20px;
}

.info-grid,
.support-grid {
  display: grid;
  gap: 16px;
}

.info-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.info-block,
.support-box,
.doc-card {
  background: var(--surface);
  border: 1px solid var(--line);
}

.info-block {
  padding: 20px;
}

.info-block h3 {
  margin-bottom: 10px;
  font-size: 1.12rem;
}

.info-block p {
  color: var(--muted);
  line-height: 1.7;
}

.plain-section {
  padding-top: 26px;
}

.section-head {
  margin-bottom: 18px;
}

.section-head h2,
.doc-card h1 {
  font-size: 2.2rem;
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.list-table {
  border-top: 1px solid var(--line);
}

.list-row {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.support-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.support-box {
  padding: 22px;
}

.support-box h3 {
  margin-bottom: 10px;
  font-size: 1.12rem;
}

.support-box a {
  display: inline-block;
  margin-top: 12px;
}

.doc-wrapper {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

.doc-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.doc-main {
  padding-top: 30px;
}

.doc-card {
  padding: 32px;
}

.doc-lead {
  margin-top: 14px;
  margin-bottom: 22px;
}

.doc-block + .doc-block {
  margin-top: 22px;
}

.doc-block h2 {
  margin-bottom: 10px;
  font-size: 1.06rem;
}

@media (max-width: 980px) {
  .product-head,
  .info-grid,
  .support-grid,
  .list-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site,
  .doc-wrapper {
    padding-left: 16px;
    padding-right: 16px;
  }

  .topbar-inner,
  .doc-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .action-line {
    flex-direction: column;
    align-items: flex-start;
  }
}