:root {
  color-scheme: light dark;
  --paper: #f6f1e6;
  --paper-raised: #fbf8f0;
  --ink: #1b1916;
  --muted-ink: rgba(27, 25, 22, 0.64);
  --hairline: rgba(27, 25, 22, 0.14);
  --accent: #6e1321;
  --accent-soft: rgba(110, 19, 33, 0.09);
  --serif: "New York", "Iowan Old Style", "Baskerville", Georgia, serif;
  --mono: "SFMono-Regular", "SF Mono", ui-monospace, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131211;
    --paper-raised: #1d1c19;
    --ink: #f0e8d9;
    --muted-ink: rgba(240, 232, 217, 0.67);
    --hairline: rgba(240, 232, 217, 0.15);
    --accent: #b84557;
    --accent-soft: rgba(184, 69, 87, 0.14);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-color: var(--accent) var(--paper-raised);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--accent);
  color: var(--paper-raised);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.site-header {
  width: min(100% - 2rem, 72rem);
  margin: 0 auto;
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  border-bottom: 1px solid var(--hairline);
}

.wordmark {
  color: var(--ink);
  font-size: 1.05rem;
  letter-spacing: 0.32em;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.82rem;
}

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

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

.language-switcher {
  display: inline-flex;
  padding: 0.2rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--paper-raised);
}

.language-switcher button {
  min-width: 2.6rem;
  min-height: 2.35rem;
  padding: 0.35rem 0.75rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted-ink);
  font: inherit;
  font-size: 0.75rem;
  cursor: pointer;
}

.language-switcher button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--paper-raised);
}

.page-shell {
  width: min(100% - 2rem, 72rem);
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 7rem) 0 6rem;
}

.home-shell {
  width: min(100% - 2rem, 58rem);
  min-height: calc(100vh - 10rem);
  margin: 0 auto;
  padding: clamp(4rem, 12vw, 9rem) 0 6rem;
  display: grid;
  align-content: center;
}

.hero-mark {
  width: 3rem;
  height: 0.38rem;
  margin-bottom: 1.5rem;
  border-radius: 999px;
  background: var(--accent);
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.12;
  text-wrap: balance;
}

h1 {
  max-width: 16ch;
  font-size: clamp(3rem, 8vw, 6rem);
  letter-spacing: -0.035em;
}

.document h1 {
  font-size: clamp(2.7rem, 6vw, 5rem);
}

h2 {
  margin-top: 3.7rem;
  margin-bottom: 1rem;
  font-size: clamp(1.75rem, 3vw, 2.3rem);
  letter-spacing: -0.02em;
}

h3 {
  margin-top: 2.25rem;
  margin-bottom: 0.7rem;
  font-size: 1.3rem;
}

.lede {
  max-width: 62ch;
  margin: 1.5rem 0 0;
  color: var(--muted-ink);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.entry-list {
  margin-top: clamp(3.5rem, 8vw, 6rem);
  border-top: 1px solid var(--hairline);
}

.entry-link {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink);
  text-decoration: none;
}

.entry-link strong {
  display: block;
  font-family: var(--serif);
  font-size: clamp(1.45rem, 3vw, 2rem);
  font-weight: 500;
}

.entry-link span {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted-ink);
  font-size: 0.85rem;
}

.entry-link svg {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--accent);
  transition: transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.entry-link:hover svg {
  transform: translateX(0.3rem);
}

.document-layout {
  display: grid;
  grid-template-columns: minmax(10rem, 14rem) minmax(0, 44rem);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
}

.document-nav {
  position: sticky;
  top: 2rem;
}

.document-nav p,
.updated {
  margin: 0 0 1.2rem;
  color: var(--muted-ink);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
}

.document-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.document-nav li + li {
  margin-top: 0.75rem;
}

.document-nav a {
  color: var(--muted-ink);
  font-size: 0.78rem;
  text-decoration: none;
}

.document-nav a:hover {
  color: var(--accent);
}

.document p,
.document li {
  max-width: 70ch;
}

.document ul {
  padding-left: 1.3rem;
}

.document li + li {
  margin-top: 0.55rem;
}

.document hr {
  margin: 3.5rem 0;
  border: 0;
  border-top: 1px solid var(--hairline);
}

.note {
  margin: 2rem 0;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--hairline);
  border-radius: 14px;
  background: var(--paper-raised);
  color: var(--muted-ink);
}

.support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 2rem 0 3rem;
}

.button-primary,
.button-secondary {
  min-height: 3.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  font-size: 0.88rem;
  text-decoration: none;
}

.button-primary {
  background: var(--accent);
  color: var(--paper-raised);
}

.button-secondary {
  border: 1px solid var(--hairline);
  background: var(--paper-raised);
  color: var(--ink);
}

details {
  border-top: 1px solid var(--hairline);
}

details:last-of-type {
  border-bottom: 1px solid var(--hairline);
}

summary {
  padding: 1.25rem 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.2rem;
  cursor: pointer;
}

details p {
  margin: -0.25rem 0 1.5rem;
  color: var(--muted-ink);
}

.site-footer {
  width: min(100% - 2rem, 72rem);
  margin: 0 auto;
  padding: 1.5rem 0 2.5rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--hairline);
  color: var(--muted-ink);
  font-size: 0.75rem;
}

[data-language] {
  display: none;
}

html[data-locale="vi"] [data-language="vi"],
html[data-locale="en"] [data-language="en"] {
  display: block;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    padding: 1.2rem 0;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.7rem 1rem;
  }

  .language-switcher {
    flex-basis: auto;
  }

  .document-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .document-nav {
    position: static;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--hairline);
  }

  .document-nav ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1rem;
  }

  .document-nav li + li {
    margin-top: 0;
  }
}

@media (max-width: 480px) {
  .site-header {
    display: block;
  }

  .site-nav {
    justify-content: flex-start;
    margin-top: 1rem;
  }

  .home-shell,
  .page-shell {
    width: min(100% - 2.5rem, 72rem);
  }

  .entry-link {
    gap: 1rem;
  }

  .site-footer {
    display: block;
  }

  .site-footer span {
    display: block;
    margin-top: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .entry-link svg {
    transition: none;
  }
}