:root {
  color-scheme: light;
  --color-text: #111827;
  --color-muted: #4b5563;
  --color-surface: #ffffff;
  --color-surface-alt: #f8fafc;
  --color-border: #e5e7eb;
  --color-primary: #2563eb;
  --accent: #2563eb;
  --color-nav-surface: #111827;
  --color-nav-accent: #1f2937;
  --color-nav-border: rgba(17, 24, 39, 0.7);
  --color-nav-text: #f9fafb;
  --color-nav-link: #f9fafb;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.08);
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --line-height-base: 1.6;
  --max-width-content: 72rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-surface);
}

main {
  padding: var(--space-6) var(--space-4);
  margin: 0 auto;
  max-width: var(--max-width-content);
}

@media (min-width: 768px) {
  main {
    padding-inline: var(--space-7);
  }
}

h1, h2, h3, h4 {
  color: #0f172a;
  font-weight: 600;
  line-height: 1.35;
  margin: var(--space-5) 0 var(--space-3);
}

p {
  margin: var(--space-3) 0;
}

ul, ol {
  margin: var(--space-3) 0 var(--space-5) var(--space-6);
  padding: 0;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

.card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin: var(--space-6) 0;
  box-shadow: var(--shadow-sm);
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 999px;
  background: #e0e7ff;
  color: #312e81;
  font-size: 12px;
  margin-right: var(--space-2);
}

.muted {
  color: var(--color-muted);
}

pre, code {
  font-family: var(--font-mono);
}

/* --- Primary navigation ------------------------------------------------- */
.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-nav-surface);
  color: var(--color-nav-text);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.14);
  border-bottom: 1px solid var(--color-nav-border);
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
}

.site-nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(59, 130, 246, 0.35);
  background: rgba(37, 99, 235, 0.25);
  color: var(--color-nav-link);
  cursor: pointer;
  transition: background 160ms ease, transform 160ms ease;
}

.site-nav__toggle svg {
  width: 22px;
  height: 22px;
}

.site-nav__toggle:focus-visible {
  outline: 2px solid rgba(248, 250, 252, 0.6);
  outline-offset: 2px;
}

.site-nav__toggle:hover {
  background: rgba(37, 99, 235, 0.4);
}

.site-nav[data-nav-state="open"] .site-nav__toggle {
  transform: scale(0.96);
  background: rgba(37, 99, 235, 0.55);
}

.site-nav__links {
  display: none;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(59, 130, 246, 0.25);
}

.site-nav__link {
  color: var(--color-nav-link);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding-block: 4px;
}

.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__link[aria-current="page"] {
  text-decoration: underline;
}

.site-nav__locale {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.85rem;
  color: rgba(248, 250, 252, 0.82);
  width: 100%;
  padding-top: var(--space-3);
  border-top: 1px solid rgba(59, 130, 246, 0.25);
}

.site-nav__locale a {
  color: rgba(191, 219, 254, 0.95);
}

.site-nav[data-nav-state="open"] .site-nav__links {
  display: flex;
}

@media (min-width: 768px) {
  .site-nav {
    flex-wrap: nowrap;
    gap: var(--space-5);
  }

  .site-nav__toggle {
    display: none;
  }

  .site-nav__links {
    display: flex !important;
    flex-direction: row;
    width: auto;
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    gap: var(--space-5);
  }

  .site-nav__locale {
    flex-direction: row;
    align-items: center;
    width: auto;
    margin-left: auto;
    gap: var(--space-3);
    padding-top: 0;
    border-top: none;
  }
}

@media (min-width: 1024px) {
  body[data-nav-layout="wide"] main {
    max-width: 84rem;
  }
}