:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --ink: #0a0a0b;
  --muted: #52525b;
  --line: #e4e4e7;
  --accent: #18181b;
  --accent-contrast: #fafafa;
  --mono: ui-monospace, "SF Mono", "Menlo", Monaco, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max: 72rem;
  --space: clamp(1rem, 2vw, 1.5rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration: none;
}

img,
svg {
  display: block;
}

.wrap {
  width: min(100% - 2 * var(--space), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.45rem var(--space);
  min-height: 52px;
  max-width: var(--max);
  margin-inline: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand img {
  width: 28px;
  height: 28px;
}

.nav-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.nav-inline a {
  text-decoration: none;
}

.nav-inline a:hover {
  color: var(--ink);
}

.hero {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.kicker {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 700;
  max-width: 22ch;
}

.lead {
  margin: 0 0 1.75rem;
  font-size: 1.125rem;
  color: var(--muted);
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
}

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

.btn-primary:hover {
  opacity: 0.92;
}

.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}

.btn-secondary:hover {
  border-color: var(--muted);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 2.5rem;
}

.meta-cell {
  background: var(--surface);
  padding: 1rem 1.1rem;
}

.meta-cell dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin: 0 0 0.35rem;
}

.meta-cell dd {
  margin: 0;
  font-weight: 600;
  font-size: 0.95rem;
}

section {
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  border-bottom: 1px solid var(--line);
}

section:last-of-type {
  border-bottom: none;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  letter-spacing: -0.02em;
}

h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.prose {
  color: var(--muted);
  max-width: 65ch;
}

.prose p {
  margin: 0 0 1rem;
}

.prose p:last-child {
  margin-bottom: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
}

.card p {
  margin: 0;
  font-size: 0.98rem;
  color: var(--muted);
}

.steps {
  margin-top: 1.75rem;
  display: grid;
  gap: 1.25rem;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.step:first-child {
  border-top: none;
  padding-top: 0;
}

.step-num {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
  min-width: 2rem;
}

.step h3 {
  margin-top: 0;
}

.bullet-list {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.bullet-list li {
  margin-bottom: 0.5rem;
}

.quote {
  margin: 2rem 0 0;
  padding: 1.25rem 1.35rem;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 12px 12px 0;
}

.quote p {
  margin: 0 0 0.5rem;
  font-style: italic;
  color: var(--ink);
}

.quote cite {
  font-style: normal;
  font-size: 0.9rem;
  color: var(--muted);
}

.faq details {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  background: var(--surface);
  margin-bottom: 0.6rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq details p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.sources {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.source-link {
  display: block;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.source-link span {
  display: block;
  margin-top: 0.35rem;
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--muted);
}

.site-footer {
  padding: 2rem var(--space);
  font-size: 0.9rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 640px) {
  .nav-inline {
    display: none;
  }
}