:root {
  color-scheme: dark;
  --background: #0d1520;
  --surface: #162232;
  --surface-soft: #1c2c3e;
  --text: #f5f8fb;
  --muted: #b7c5d4;
  --accent: #55d6be;
  --accent-strong: #91f0df;
  --border: #30445a;
  --shadow: rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 10%, rgba(85, 214, 190, 0.12), transparent 34rem),
    linear-gradient(160deg, #101c2a 0%, var(--background) 58%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

a {
  color: var(--accent-strong);
  text-underline-offset: 0.2em;
}

a:hover,
a:focus-visible {
  color: #ffffff;
}

.shell {
  width: min(100% - 2rem, 820px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.25rem;
}

.header-tools {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  min-width: 0;
}

.brand {
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 650;
  text-decoration: none;
}

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

.language-menu {
  position: static;
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.9rem;
}

.language-menu summary {
  display: inline-grid;
  grid-auto-flow: column;
  align-items: center;
  gap: 0.4rem;
  height: 2.5rem;
  max-width: min(15rem, 55vw);
  padding: 0 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-weight: 650;
  list-style: none;
}

.language-menu summary:hover {
  border-color: var(--accent);
  background: var(--surface-soft);
}

.language-menu summary:focus-visible {
  outline: 0.16rem solid var(--accent-strong);
  outline-offset: 0.16rem;
}

.language-menu summary::-webkit-details-marker {
  display: none;
}

.language-menu summary::marker {
  content: "";
}

.language-icon {
  width: 1.05rem;
  height: 1.05rem;
  color: var(--accent);
}

.language-menu-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
}

.current-language {
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.language-chevron {
  width: 0.45rem;
  height: 0.45rem;
  margin-inline-start: 0.1rem;
  border-right: 0.12rem solid var(--accent);
  border-bottom: 0.12rem solid var(--accent);
  transform: translateY(-0.12rem) rotate(45deg);
  transition: transform 120ms ease;
}

.language-menu[open] .language-chevron {
  transform: translateY(0.12rem) rotate(225deg);
}

.language-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.2rem;
  margin: 0;
  padding: 0.55rem;
  list-style: none;
}

.language-menu .language-options {
  position: absolute;
  z-index: 100;
  top: calc(100% + 0.5rem);
  inset-inline-end: 0;
  width: min(24rem, calc(100vw - 2rem));
  max-height: calc(100vh - 8rem);
  max-height: min(calc(100dvh - 8rem), 31rem);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: #162232;
  box-shadow: 0 1.2rem 3rem rgba(0, 0, 0, 0.48);
}

.language-options a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  min-width: 0;
  padding: 0.45rem 0.55rem;
  border-radius: 0.45rem;
  color: var(--muted);
  text-decoration: none;
}

.language-options a:hover,
.language-options a:focus-visible,
.language-options a[aria-current="true"] {
  color: var(--text);
  background: var(--surface-soft);
}

.language-options a[aria-current="true"]::after {
  flex: 0 0 auto;
  color: var(--accent);
  content: "✓";
  font-weight: 850;
}

.not-found-languages {
  max-width: 34rem;
  margin-top: 2rem;
}

.language-options-wide {
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  padding: 0;
}

main {
  padding-block: clamp(2rem, 7vw, 5.5rem);
}

.hero {
  padding-block: clamp(2rem, 10vw, 7rem);
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.18;
}

h1 {
  max-width: 17ch;
  margin: 0;
  font-size: clamp(2.5rem, 9vw, 5.4rem);
  letter-spacing: -0.05em;
}

.document h1 {
  max-width: none;
  font-size: clamp(2.2rem, 7vw, 4rem);
}

h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: clamp(1.35rem, 4vw, 1.75rem);
}

h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
}

p,
li {
  color: var(--muted);
}

.lead {
  max-width: 60ch;
  margin: 1.4rem 0 0;
  font-size: clamp(1.05rem, 3vw, 1.25rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 2.8rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  color: var(--text);
  background: var(--surface);
  font-weight: 750;
  text-decoration: none;
  text-align: center;
  white-space: normal;
  box-shadow: 0 0.7rem 2rem var(--shadow);
}

.button.primary {
  border-color: transparent;
  color: #071713;
  background: var(--accent);
}

.card,
.document {
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: rgba(22, 34, 50, 0.92);
  box-shadow: 0 1.2rem 3rem var(--shadow);
}

.card {
  padding: clamp(1.25rem, 4vw, 2rem);
}

.document {
  padding: clamp(1.25rem, 5vw, 3rem);
}

.document .metadata {
  margin: 0.75rem 0 2rem;
  color: var(--muted);
}

.document strong {
  color: var(--text);
}

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

.callout {
  margin-block: 1.5rem;
  padding: 1rem 1.15rem;
  border-left: 0.25rem solid var(--accent);
  border-radius: 0.4rem;
  background: var(--surface-soft);
}

.translation-notice {
  border-left-color: #f0c875;
}

.site-footer {
  margin-top: 2rem;
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0;
}

:lang(de),
:lang(ru) {
  hyphens: auto;
}

:lang(zh-Hans),
:lang(zh-Hant),
:lang(ja),
:lang(ko) {
  line-break: strict;
  overflow-wrap: break-word;
  word-break: normal;
}

@media (max-width: 560px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-tools {
    align-items: flex-start;
    justify-content: space-between;
    width: 100%;
  }

  .site-nav {
    gap: 0.8rem;
  }

  .language-menu .language-options {
    width: min(24rem, 100%);
    max-height: calc(100vh - 8rem);
    max-height: min(calc(100dvh - 8rem), 27rem);
  }
}

@media (max-width: 430px) {
  .language-menu-label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .language-menu summary {
    max-width: 52vw;
  }
}

@media (max-width: 380px) {
  .language-options {
    grid-template-columns: 1fr;
  }
}