.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-16);
}

.section--sm {
  padding-block: var(--space-12);
}

.section--lg {
  padding-block: var(--space-24);
}

.section-header {
  margin-bottom: var(--space-10);
}

.section-header--center {
  text-align: center;
}

.section-header--center p {
  margin-inline: auto;
}

.section-header .eyebrow {
  margin-bottom: var(--space-3);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

.split {
  display: grid;
  gap: var(--space-10);
  align-items: center;
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-6);
  }

  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-subtle);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.site-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.site-logo span {
  color: var(--color-accent);
}

.site-nav {
  display: none;
  align-items: center;
  gap: var(--space-6);
}

.site-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text);
}

.menu-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  position: relative;
}

.menu-toggle__bar::before,
.menu-toggle__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition);
}

.menu-toggle__bar::before { top: -6px; }
.menu-toggle__bar::after { top: 6px; }

.menu-toggle[aria-expanded="true"] .menu-toggle__bar {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar::after {
  top: 0;
  transform: rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: fixed;
  inset: var(--header-height) 0 0 0;
  background: var(--color-bg);
  padding: var(--space-6);
  z-index: 99;
  overflow-y: auto;
}

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

.mobile-nav a {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-lg);
  font-weight: 500;
  border-bottom: 1px solid var(--color-border-subtle);
}

.mobile-nav__cta {
  margin-top: var(--space-6);
}

@media (min-width: 1024px) {
  .site-nav {
    display: flex;
  }

  .menu-toggle {
    display: none;
  }
}

.site-footer {
  border-top: 1px solid var(--color-border-subtle);
  padding-block: var(--space-12);
  background: var(--color-bg-elevated);
}

.footer-grid {
  display: grid;
  gap: var(--space-8);
}

.footer-brand p {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.footer-col a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-block: var(--space-1);
  transition: color var(--transition);
}

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

.footer-bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 50;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--color-text);
  border-color: var(--color-accent);
}