:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-muted: #fafafa;
  --text: #111111;
  --muted: #5f5f5f;
  --line: #e7e7e7;
  --line-strong: #d7d7d7;
  --accent: #111111;
  --accent-contrast: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
}

a {
  color: inherit;
}

.site {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding-bottom: 56px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(231, 231, 231, 0.9);
}

.brand,
.topnav a,
.button {
  text-decoration: none;
}

.brand {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topnav {
  display: flex;
  gap: 24px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
}

.topnav a {
  color: var(--muted);
  font-size: 0.96rem;
}

.language-picker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.language-label {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.language-picker select {
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(280px, 0.9fr);
  gap: 28px;
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  max-width: 720px;
}

.kicker,
.meta-label,
.step-number {
  margin: 0;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
.package-name {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.04em;
}

h1 {
  max-width: 13ch;
  margin-top: 14px;
  font-size: clamp(2.2rem, 4.6vw, 3.9rem);
  line-height: 1;
}

.lead,
.muted,
.step p,
.scope-copy p,
.scope-list {
  color: var(--muted);
  line-height: 1.65;
}

.lead {
  max-width: 60ch;
  margin: 22px 0 0;
  font-size: 0.98rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  font-weight: 700;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  color: var(--accent-contrast);
  background: var(--accent);
  border-color: var(--accent);
}

.button-secondary {
  background: var(--surface);
}

.hero-meta,
.download-panel,
.step,
.scope-list,
.final-call {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
}

.hero-meta {
  display: grid;
  align-content: start;
}

.meta-row {
  padding: 18px 20px;
}

.meta-row + .meta-row {
  border-top: 1px solid var(--line);
}

.meta-row strong {
  display: block;
  margin-top: 8px;
  font-size: 1rem;
  line-height: 1.45;
}

.section {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

.section-header {
  max-width: 720px;
}

h2 {
  margin-top: 10px;
  font-size: clamp(1.45rem, 2.4vw, 2.1rem);
  line-height: 1.08;
}

.download-panel {
  margin-top: 22px;
  padding: 22px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}

.package-name {
  margin-top: 8px;
  font-size: 1.15rem;
}

.muted {
  margin: 10px 0 0;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.step {
  padding: 20px;
}

.step h3 {
  margin-top: 10px;
  font-size: 1rem;
  line-height: 1.2;
}

.step p {
  margin: 10px 0 0;
}

.scope-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 18px;
  margin-top: 22px;
}

.scope-copy {
  display: grid;
  gap: 14px;
}

.scope-copy p {
  margin: 0;
}

.scope-list {
  margin: 0;
  padding: 22px 22px 22px 40px;
}

.scope-list li + li {
  margin-top: 10px;
}

.final-call {
  margin-top: 36px;
  padding: 24px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}

.final-call h2 {
  max-width: 15ch;
}

.final-links {
  display: flex;
  gap: 10px;
  align-items: center;
}

@media (max-width: 980px) {
  .hero,
  .scope-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .download-panel,
  .final-call {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .site {
    width: min(100% - 20px, 1120px);
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .topbar-actions {
    width: 100%;
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .topnav {
    flex-wrap: wrap;
    gap: 14px;
  }

  .language-picker {
    width: 100%;
  }

  .language-picker select {
    width: 100%;
  }

  .final-links {
    flex-wrap: wrap;
  }
}