:root {
  --bg: #f3f5f8;
  --panel: #ffffff;
  --line: #d6dde7;
  --ink: #162334;
  --muted: #617084;
  --accent: #2f5fbf;
  --accent-2: #f2c94c;
  --accent-dark: #20438b;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", sans-serif;
}

.page {
  max-width: 1160px;
  margin: 0 auto;
  padding: 24px 24px 56px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 700;
}

.brand-name,
.dark-text,
.nav a,
.version-button strong,
.download-button,
.legal-links a,
.doc-link,
h1,
h2,
h3,
.doc-block h2 {
  font-family: "IBM Plex Mono", monospace;
}

.brand-name,
.dark-text {
  font-size: 1rem;
  font-weight: 700;
}

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

.nav a,
.legal-links a,
.doc-link {
  color: var(--accent-dark);
  text-decoration: none;
  font-size: 0.92rem;
}

.hero,
.versions-panel,
.download-band,
.usage-grid,
.legal,
.doc-card {
  margin-top: 24px;
}

.hero {
  padding-top: 10px;
}

.eyebrow,
.section-label {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
}

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

h1 {
  max-width: 840px;
  font-size: clamp(2.7rem, 4.8vw, 4.6rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.lead,
.versions-head p,
.usage-card p,
.legal-copy p,
.doc-lead,
.doc-block p,
.version-button span {
  color: var(--muted);
  line-height: 1.72;
}

.lead {
  max-width: 780px;
  margin-top: 18px;
}

.versions-panel,
.download-band,
.usage-card,
.legal,
.doc-card {
  background: var(--panel);
  border: 1px solid var(--line);
}

.versions-panel,
.download-band,
.legal,
.doc-card {
  padding: 24px;
}

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

.versions-head h2,
.download-copy h2,
.legal-copy h2,
.doc-card h1 {
  font-size: 2rem;
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.version-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.version-button {
  display: grid;
  gap: 10px;
  padding: 18px;
  text-decoration: none;
  background: #f8fbff;
  border: 1px solid var(--line);
}

.version-button strong {
  color: var(--ink);
  font-size: 1rem;
}

.download-band {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
}

.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 18px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}

.usage-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr 0.85fr;
  gap: 16px;
}

.usage-card {
  padding: 22px;
}

.wide {
  grid-row: span 2;
  background: linear-gradient(180deg, #ffffff 0%, #f6f9ff 100%);
}

.usage-card h3 {
  margin-bottom: 10px;
  font-size: 1.08rem;
}

.legal {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
}

.legal-links {
  display: grid;
  gap: 10px;
  min-width: 280px;
}

.doc-page {
  max-width: 1000px;
}

.doc-main {
  padding-top: 24px;
}

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

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

.doc-block h2 {
  margin-bottom: 10px;
  font-size: 1.02rem;
}

@media (max-width: 980px) {
  .version-grid,
  .download-band,
  .usage-grid,
  .legal {
    grid-template-columns: 1fr;
  }

  .wide {
    grid-row: auto;
  }
}

@media (max-width: 720px) {
  .page {
    padding: 16px 16px 36px;
  }

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