:root {
  --background: #fcfcfc;
  --text: #222;
  --muted: #666;
  --border: #d8d8d8;
  --link: #0056b3;
  --link-hover-text: #fff;
  --panel: #f4f4f4;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  text-size-adjust: 100%;
}

body {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  line-height: 1.7;
  color: #222;
  background-color: #fcfcfc;
}

h1,
h2,
h3,
h4,
.nav-links {
  font-family: "SF Mono", "Monaco", "Courier New", monospace;
  letter-spacing: -0.5px;
}

html[lang="fa"] {
  direction: rtl;
}

html[lang="fa"] body {
  direction: rtl;
  text-align: right;
  font-family: "Vazirmatn", "Vazir", Tahoma, sans-serif;
}

html[lang="fa"] h1,
html[lang="fa"] h2,
html[lang="fa"] h3,
html[lang="fa"] h4,
html[lang="fa"] .nav-links {
  font-family: "Vazirmatn", "Vazir", Tahoma, sans-serif;
  letter-spacing: 0;
}

h1 {
  margin: 1.5rem 0 1rem;
  font-size: clamp(2rem, 7vw, 3.6rem);
  line-height: 1.12;
}

h2 {
  margin: 2.25rem 0 0.75rem;
  font-size: 1.3rem;
  line-height: 1.3;
}

h3 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.05rem;
}

p {
  margin: 0 0 1.15rem;
}

a {
  color: #0056b3;
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
  transition: color 120ms ease, background-color 120ms ease, border-color 120ms ease;
}

a:hover,
a:focus-visible {
  color: #fff;
  background-color: #0056b3;
  border-bottom-color: #0056b3;
  outline: 0;
}

code,
pre {
  font-family: "SF Mono", "Monaco", "Courier New", monospace;
}

code {
  padding: 0.12rem 0.28rem;
  background: var(--panel);
  border-radius: 3px;
}

ul,
ol {
  padding-left: 1.35rem;
}

html[lang="fa"] ul,
html[lang="fa"] ol {
  padding-right: 1.35rem;
  padding-left: 0;
}

li + li {
  margin-top: 0.35rem;
}

hr {
  margin: 3rem 0 1.25rem;
  border: 0;
  border-top: 1px solid var(--border);
}

main {
  min-height: 55vh;
}

footer {
  color: var(--muted);
  font-size: 0.95rem;
}

footer p {
  margin: 0.35rem 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  padding: 0.4rem 0.65rem;
  color: var(--link-hover-text);
  background: var(--link);
  border: 0;
}

.skip-link:focus {
  left: 1rem;
  z-index: 10;
}

html[lang="fa"] .skip-link {
  right: -999px;
  left: auto;
}

html[lang="fa"] .skip-link:focus {
  right: 1rem;
  left: auto;
}

.language-switcher {
  margin: 0 0 1rem;
  text-align: right;
  font-family: "SF Mono", "Monaco", "Courier New", monospace;
  font-size: 0.9rem;
  color: var(--muted);
}

html[lang="fa"] .language-switcher {
  text-align: left;
  font-family: "Vazirmatn", "Vazir", Tahoma, sans-serif;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  align-items: center;
  margin: 0 0 2.5rem;
  font-size: 0.95rem;
}

html[lang="fa"] .nav-links {
  justify-content: flex-start;
}

.nav-links a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--text);
}

.nav-links a[aria-current="page"]:hover,
.nav-links a[aria-current="page"]:focus-visible {
  color: var(--link-hover-text);
  background: var(--link);
  border-bottom-color: var(--link);
}

.kicker {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-family: "SF Mono", "Monaco", "Courier New", monospace;
  font-size: 0.95rem;
}

html[lang="fa"] .kicker {
  font-family: "Vazirmatn", "Vazir", Tahoma, sans-serif;
}

.content-list {
  padding: 0;
  list-style: none;
}

.content-list li {
  padding: 0.8rem 0;
  border-top: 1px solid var(--border);
}

.content-list li:last-child {
  border-bottom: 1px solid var(--border);
}

.note {
  padding: 1rem;
  color: var(--muted);
  background: var(--panel);
  border-left: 3px solid var(--border);
}

html[lang="fa"] .note {
  border-right: 3px solid var(--border);
  border-left: 0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #111;
    --text: #ddd;
    --muted: #aaa;
    --border: #333;
    --link: #4da3ff;
    --link-hover-text: #111;
    --panel: #1b1b1b;
  }

  html {
    color-scheme: dark;
  }

  body {
    color: #ddd;
    background-color: #111;
  }

  a {
    color: #4da3ff;
    border-color: #4da3ff;
  }

  a:hover,
  a:focus-visible {
    color: #111;
    background-color: #4da3ff;
    border-bottom-color: #4da3ff;
  }
}

@media (max-width: 520px) {
  body {
    margin: 24px auto;
  }

  .nav-links {
    gap: 0.25rem 0.65rem;
  }
}

@media print {
  body {
    max-width: none;
    color: #000;
    background: #fff;
  }

  .language-switcher,
  .nav-links,
  footer {
    display: none;
  }

  a {
    color: #000;
    border: 0;
  }
}