:root {
  --font-body: 'Roboto', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --pico-font-family: var(--font-body);
  --pico-font-size: 106%;
  --pico-line-height: 1.7;
  --pico-border-radius: 0.75rem;
  --pico-spacing: 1rem;
  --pico-primary: #0b6c7a;
  --pico-primary-hover: #095b68;
  --pico-primary-focus: rgba(11, 108, 122, 0.2);
  --pico-contrast: #0b1a1f;
  --pico-muted-color: #2c3d43;
}

[data-theme='dark'] {
  --pico-background-color: #0c171a;
  --pico-color: #e3ecec;
  --pico-contrast: #f4fbfb;
  --pico-muted-color: #b1c1c3;
  --pico-card-background-color: #101f23;
  --pico-card-border-color: #1a2c31;
  --pico-primary: #4fb6c4;
  --pico-primary-hover: #3ea7b6;
}

body {
  font-family: var(--font-body);
  background: var(--pico-background-color, #f6f7f6);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--pico-background-color, #f6f7f6) 85%, transparent);
  border-bottom: 1px solid var(--pico-card-border-color, #d7e0de);
  backdrop-filter: blur(10px);
}

.nav-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand img {
  display: block;
  height: auto;
  max-width: 210px;
}

.brand-text {
  font-weight: 700;
  color: var(--pico-contrast);
}

.nav-links {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--pico-muted-color);
  font-weight: 600;
}

.nav-link.is-active,
.nav-link:hover {
  color: var(--pico-primary);
}

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

.lang-switch select {
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font-weight: 600;
}

.theme-toggle {
  border-radius: 999px;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--pico-card-border-color, #d7e0de);
  background: var(--pico-card-background-color, #fff);
  color: var(--pico-contrast);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  box-shadow: 0 8px 18px rgba(8, 20, 22, 0.1);
}

.theme-toggle svg {
  display: block;
}

.theme-toggle .icon-moon {
  display: none;
}

[data-theme='dark'] .theme-toggle .icon-sun {
  display: none;
}

[data-theme='dark'] .theme-toggle .icon-moon {
  display: block;
}

.menu-toggle {
  display: none;
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--pico-card-border-color, #d7e0de);
  background: transparent;
  color: var(--pico-contrast);
}

.site-main,
.home-main {
  padding: 2.5rem 0 4rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.9fr) minmax(0, 2fr) minmax(200px, 0.8fr);
  gap: 2rem;
}

.sidebar,
.toc {
  background: var(--pico-card-background-color, #fff);
  border: 1px solid var(--pico-card-border-color, #d7e0de);
  border-radius: var(--pico-border-radius);
  padding: 1.25rem;
  position: sticky;
  top: 6rem;
  height: fit-content;
}

.sidebar h3,
.toc h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--pico-contrast);
}

.sidebar ul,
.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar li + li,
.toc li + li {
  margin-top: 0.5rem;
}

.sidebar a,
.toc a {
  text-decoration: none;
  color: var(--pico-muted-color);
  font-weight: 500;
}

.sidebar a[aria-current='page'],
.sidebar a:hover,
.toc a:hover {
  color: var(--pico-primary);
}

.toc .toc-sub {
  margin-left: 1rem;
  font-size: 0.95rem;
}

.content {
  background: var(--pico-card-background-color, #fff);
  border: 1px solid var(--pico-card-border-color, #d7e0de);
  border-radius: 1rem;
  padding: 2.25rem 2.5rem;
  box-shadow: 0 20px 40px rgba(8, 20, 22, 0.08);
}

.page-hero {
  margin-bottom: 1.5rem;
}

.page-kicker {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--pico-primary);
  font-weight: 700;
}

.lede {
  font-size: 1.05rem;
  color: var(--pico-muted-color);
}

.page-content {
  line-height: 1.7;
}

.page-content a {
  color: var(--pico-primary);
  text-underline-offset: 3px;
  font-weight: 600;
}

.page-content a:hover {
  color: var(--pico-primary-hover);
}

.page-content blockquote {
  border-left: 4px solid var(--pico-primary);
  padding-left: 1rem;
  color: var(--pico-muted-color);
}

.breadcrumbs {
  margin-bottom: 1.2rem;
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.breadcrumbs li::after {
  content: '/';
  margin-left: 0.5rem;
  color: var(--pico-muted-color);
}

.breadcrumbs li:last-child::after {
  content: '';
}

.breadcrumbs a {
  text-decoration: none;
  color: var(--pico-primary);
}

.site-footer {
  padding: 3rem 0;
  border-top: 1px solid var(--pico-card-border-color, #d7e0de);
  background: var(--pico-background-color, #f6f7f6);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-brand {
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--pico-contrast);
}

.footer-tagline {
  color: var(--pico-muted-color);
}

.hero {
  padding: 3rem 0 3.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.5rem;
  align-items: center;
}

.hero-tag {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--pico-primary);
}

.hero-copy h1 {
  font-size: clamp(2.6rem, 4vw, 3.4rem);
  margin-bottom: 1rem;
  color: var(--pico-contrast);
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--pico-muted-color);
  max-width: 36ch;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}

.button.primary {
  background: var(--pico-primary);
  color: #fff;
}

.button.primary:hover {
  background: var(--pico-primary-hover);
}

.button.ghost {
  border-color: var(--pico-primary);
  color: var(--pico-primary);
}

.button.ghost:hover {
  background: color-mix(in srgb, var(--pico-primary) 12%, transparent);
}

.hero-card {
  background: var(--pico-card-background-color, #fff);
  border-radius: 1rem;
  padding: 2rem;
  border: 1px solid var(--pico-card-border-color, #d7e0de);
  box-shadow: 0 18px 36px rgba(8, 20, 22, 0.08);
}

.hero-card img {
  max-width: 230px;
}

.hero-card p {
  color: var(--pico-muted-color);
  font-weight: 500;
}

.features {
  padding: 3rem 0 2rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.feature-card {
  background: var(--pico-card-background-color, #fff);
  border-radius: 1rem;
  padding: 1.6rem;
  border: 1px solid var(--pico-card-border-color, #d7e0de);
  box-shadow: 0 14px 30px rgba(8, 20, 22, 0.08);
}

.feature-card p {
  color: var(--pico-muted-color);
  font-weight: 500;
}

.content-highlight {
  padding: 2.5rem 0 2rem;
}

.highlight-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr);
  gap: 2.5rem;
  align-items: start;
}

.featured-list {
  display: grid;
  gap: 1rem;
}

.featured-item {
  background: var(--pico-card-background-color, #fff);
  border: 1px solid var(--pico-card-border-color, #d7e0de);
  padding: 1.4rem;
  border-radius: 1rem;
}

.featured-item p {
  color: var(--pico-muted-color);
}

.cta {
  padding: 2.5rem 0 4rem;
}

.cta-panel {
  background: #7884;
  color: #fff;
  border-radius: 1rem;
  padding: 2.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.cta-panel .button.primary {
  background: var(--pico-primary);
}

.cta-panel .button.primary:hover {
  background: var(--pico-primary-hover);
}

.not-found-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar,
  .toc {
    position: static;
  }

  .toc {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-bar {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0.75rem;
    background: var(--pico-card-background-color, #fff);
    border: 1px solid var(--pico-card-border-color, #d7e0de);
    border-radius: 1rem;
    padding: 1rem;
    grid-column: 1 / -1;
  }

  .nav-links.is-open {
    display: flex;
  }

  .menu-toggle {
    display: inline-flex;
    justify-self: end;
  }

  .sidebar {
    display: none;
  }

  .sidebar.is-open {
    display: block;
  }

  .content {
    padding: 1.8rem;
  }

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

  .cta-panel {
    flex-direction: column;
    align-items: flex-start;
  }
}