:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #737373;
  --faint: #a3a3a3;
  --line: #e5e5e5;
  --code-bg: #0a0a0a;
  --code-fg: #f5f5f5;
  --sans: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  opacity: 0.65;
}

.inline {
  font-family: var(--mono);
  font-size: 0.85em;
}

.faint {
  font-size: 0.8rem;
  color: var(--muted);
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  z-index: 20;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--fg);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.logo-glyph {
  font-size: 1.1rem;
  opacity: 0.35;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 500;
}

.nav a:hover {
  color: var(--fg);
  opacity: 1;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--line);
}

.kicker {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero-desc {
  color: var(--muted);
  max-width: 30rem;
  margin-bottom: 2rem;
  font-size: 1rem;
}

.btn-primary {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--fg);
  color: var(--bg);
  border: none;
  padding: 0.85rem 1.4rem;
  cursor: pointer;
  border-radius: 2px;
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-primary.done {
  background: var(--muted);
}

.btn-secondary {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--fg);
  border: 1px solid var(--line);
  padding: 0.5rem 0.75rem;
  border-radius: 2px;
}

.btn-secondary:hover {
  border-color: var(--fg);
  opacity: 1;
}

section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--line);
}

.section-title {
  font-size: 0.68rem;
  font-family: var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

.section-lead {
  color: var(--muted);
  margin-top: 0.75rem;
  margin-bottom: 1.25rem;
  font-size: 0.92rem;
}

.install-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.install-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.step-list {
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.step-list li {
  margin-bottom: 0.85rem;
}

.step-list strong {
  color: var(--fg);
}

.public-api {
  padding-top: 0;
}

.api-box {
  border: 1px solid var(--fg);
  padding: 1.25rem 1rem;
}

.api-row {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  margin-bottom: 0.75rem;
}

.api-row:last-child {
  margin-bottom: 0;
}

.api-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.api-value {
  font-family: var(--mono);
  font-size: 0.78rem;
  word-break: break-all;
}

.code {
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.55;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1.25rem 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.code-tall {
  max-height: min(70vh, 520px);
  overflow-y: auto;
}

.snippet-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.script-card {
  border: 1px solid var(--line);
}

.script-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--line);
  background: #fafafa;
}

.script-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.script-card .code {
  border: none;
}

.copy {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--fg);
  color: var(--bg);
  border: none;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  border-radius: 2px;
}

.copy:hover {
  opacity: 0.8;
}

.copy.done {
  background: var(--muted);
}

.rules-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1rem;
}

.rules-grid h3 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.rules-grid ul {
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.rules-grid li {
  margin-bottom: 0.4rem;
}

.footer {
  padding: 2rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}

.footer p + p {
  margin-top: 0.5rem;
}

@media (max-width: 640px) {
  .header,
  main {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .rules-grid {
    grid-template-columns: 1fr;
  }
}