.site-nav {
  position: sticky;
  top: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hairline);
  z-index: 100;
  transition: box-shadow 0.2s;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-nav {
    background: rgba(10, 10, 10, 0.85);
  }
}

:root[data-theme="dark"] .site-nav {
  background: rgba(10, 10, 10, 0.85);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--red);
}

.nav-left:hover { text-decoration: none; }

.nav-wordmark {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.nav-center {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-center a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-center a:hover {
  color: var(--ink);
  text-decoration: none;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-cta {
  background: var(--red);
  color: white;
  padding: 8px 20px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  transition: opacity 0.15s;
}

.nav-cta:hover {
  opacity: 0.88;
  text-decoration: none;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--ink-3);
  cursor: pointer;
  font-size: 18px;
  padding: 4px;
  line-height: 1;
  transition: color 0.15s;
}

.theme-toggle:hover {
  color: var(--ink);
}

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--ink);
  cursor: pointer;
  padding: 4px;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--paper);
  z-index: 101;
  padding: 24px var(--gutter);
  overflow-y: auto;
}

.mobile-nav.open {
  display: block;
}

.mobile-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav a {
  display: block;
  padding: 12px 0;
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 1px solid var(--hairline);
  text-decoration: none;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav .mobile-cta {
  display: inline-flex;
  margin-top: 20px;
  background: var(--red);
  color: white;
  padding: 14px 28px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 17px;
  text-decoration: none;
}

@media (max-width: 768px) {
  :root { --gutter: 20px; --section-pad: 64px; --hero-pad-top: 80px; }

  .nav-center { display: none; }
  .nav-cta { display: none; }

  .nav-hamburger { display: block; }
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: var(--section-pad) 0;
  border-top: 1px solid var(--hairline);
}

.section:first-child {
  border-top: none;
}

.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 64px 0 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-3);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  font-size: 15px;
  color: var(--ink-2);
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--ink);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px var(--gutter) 0;
  margin-top: 48px;
  border-top: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-lockup {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-3);
}

.footer-lockup span {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--ink-3);
}

.footer-copyright {
  font-size: 13px;
  color: var(--ink-3);
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* Doc page nav/header (injected by includes.js) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
  height: var(--nav-height);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-header { background: rgba(10, 10, 10, 0.85); }
}
:root[data-theme="dark"] .site-header { background: rgba(10, 10, 10, 0.85); }

.header-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ink);
}
.site-logo:hover { text-decoration: none; }
.site-logo svg { flex-shrink: 0; color: var(--red); }
.site-logo span {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--red);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-links a {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--ink); text-decoration: none; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  color: var(--ink);
}

.page-shell {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-hero {
  text-align: center;
  padding: 5rem 1.5rem 4rem;
  max-width: var(--max-width-content);
  margin: 0 auto;
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .page-hero { padding: 2.5rem 1rem; }
}