:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.55;
  color: #fff;
  background: #101011;
  --background: #101011;
  --surface: #1d1d20;
  --surface-elevated: #292c32;
  --accent: #00e676;
  --accent-cyan: #00bcd4;
  --muted: #9b9b9f;
  --divider: #2b2b2e;
  --scrim: rgb(13 15 20 / 70%);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 20rem;
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at 12% -10%, rgb(0 230 118 / 10%), transparent
    28rem),
    radial-gradient(circle at 92% 8%, rgb(0 188 212 / 8%), transparent 24rem),
    var(--background);
}

button {
  font: inherit;
}

a {
  color: var(--accent);
  overflow-wrap: anywhere;
}

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

::selection {
  color: #101011;
  background: var(--accent);
}

[hidden] {
  display: none !important;
}

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

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  min-height: 3rem;
  padding: 0.75rem 1rem;
  display: inline-flex;
  align-items: center;
  color: #101011;
  background: var(--accent);
  border-radius: 1rem;
  font-weight: 700;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--divider);
  background: rgb(16 16 17 / 88%);
}

.site-header__inner,
.site-footer__inner,
main {
  width: min(calc(100% - 3rem), 52rem);
  margin: 0 auto;
}

.site-header__inner {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

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

.brand__logo {
  width: 2.5rem;
  height: 2.5rem;
  flex: 0 0 auto;
  object-fit: contain;
}

.brand__name {
  display: inline-block;
  color: #fff;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.055em;
  line-height: 1.25;
  background: linear-gradient(90deg, #fff, #c7ffe1);
  background-clip: text;
  filter: drop-shadow(0 0 0.75rem rgb(0 230 118 / 24%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-label {
  color: var(--accent);
}

main {
  flex: 1;
  padding: 3rem 0 4rem;
}

.surface {
  overflow: hidden;
  background: linear-gradient(160deg, rgb(41 44 50 / 92%), rgb(29 29 32 / 98%));
  border: 1px solid rgb(255 255 255 / 8%);
  border-radius: 1.5rem;
  box-shadow: 0 1.5rem 4rem rgb(0 0 0 / 28%);
}

.section-label,
.metadata {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 600;
}

.section-label {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.language-control {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.metadata,
.lead,
.document p,
.site-footer {
  color: var(--muted);
}

.language-dropdown {
  position: relative;
}

.language-flag {
  width: 1.4rem;
  height: 0.95rem;
  flex: 0 0 auto;
  overflow: hidden;
  display: inline-grid;
  place-items: center;
  border-radius: 0.125rem;
  box-shadow: 0 0 0 1px rgb(255 255 255 / 18%);
}

.language-flag[data-language-current-flag="vi"],
.language-flag[data-language-flag="vi"] {
  color: #ffeb3b;
  background: #da251d;
}

.language-flag[data-language-current-flag="vi"]::after,
.language-flag[data-language-flag="vi"]::after {
  content: "★";
  font-size: 0.68rem;
  line-height: 1;
}

.language-flag[data-language-current-flag="en"],
.language-flag[data-language-flag="en"] {
  background:
    linear-gradient(transparent 38%, #cf142b 38% 62%, transparent 62%),
    linear-gradient(90deg, transparent 40%, #cf142b 40% 60%, transparent 60%),
    #fff;
}

.language-dropdown__trigger {
  min-width: 9.5rem;
  min-height: 3rem;
  padding: 0 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: #fff;
  background: var(--surface-elevated);
  border: 1px solid rgb(255 255 255 / 14%);
  border-radius: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.language-dropdown__trigger:hover {
  border-color: rgb(0 230 118 / 60%);
}

.language-dropdown__trigger:focus,
.language-dropdown__trigger:focus-visible {
  outline: none;
  box-shadow: none;
}

.language-dropdown__menu {
  position: absolute;
  z-index: 20;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 100%;
  padding: 0.375rem;
  background: var(--surface-elevated);
  border: 1px solid rgb(255 255 255 / 14%);
  border-radius: 1rem;
  box-shadow: 0 1rem 2.5rem rgb(0 0 0 / 40%);
}

.language-dropdown__option {
  width: 100%;
  min-height: 2.75rem;
  padding: 0 0.625rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #fff;
  background: transparent;
  border: 0;
  border-radius: 0.75rem;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
}

.language-dropdown__option:hover,
.language-dropdown__option:focus-visible,
.language-dropdown__option[aria-selected="true"] {
  background: rgb(0 230 118 / 12%);
  outline: none;
}

.language-content {
  padding: clamp(1.5rem, 5vw, 3.5rem);
}

.section-label {
  margin-bottom: 1rem;
}

h1,
h2,
.document-link strong {
  font-family: Outfit, Inter, ui-sans-serif, system-ui, sans-serif;
  color: #fff;
}

h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.lead {
  max-width: 42rem;
  margin: 1.25rem 0 0;
  font-size: 1rem;
}

.document-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.document-link {
  min-height: 8rem;
  padding: 1.25rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: 1rem;
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms
    ease;
}

.document-link:hover {
  background: var(--surface-elevated);
  border-color: rgb(0 230 118 / 45%);
  transform: translateY(-2px);
}

.document-link strong,
.document-link small {
  display: block;
}

.document-link strong {
  font-size: 1.125rem;
}

.document-link small {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.document-link__arrow {
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  color: #101011;
  background: var(--accent);
  border-radius: 50%;
  font-weight: 700;
}

.back-link {
  min-height: 3rem;
  margin-bottom: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
}

.back-link:hover {
  color: var(--accent);
}

.document-shell .language-content {
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

.metadata {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--divider);
}

.document h1 {
  max-width: none;
  margin: 1.5rem 0 2rem;
  font-size: clamp(2rem, 6vw, 3rem);
}

.document h2 {
  margin: 2.25rem 0 0.75rem;
  font-size: 1.35rem;
  line-height: 1.25;
}

.document p {
  margin: 0;
}

.document p + p {
  margin-top: 1rem;
}

.document a {
  text-decoration-color: rgb(0 230 118 / 55%);
  text-underline-offset: 0.18em;
}

.notice {
  padding: 1rem;
  border: 1px solid rgb(0 230 118 / 25%);
  border-left: 0.25rem solid var(--accent);
  border-radius: 0.75rem;
  background: rgb(0 122 61 / 16%);
}

.site-footer {
  border-top: 1px solid var(--divider);
  background: rgb(16 16 17 / 92%);
}

.site-footer__inner {
  min-height: 5rem;
  padding: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--muted);
}

@media (max-width: 40rem) {
  .site-header__inner,
  .site-footer__inner,
  main {
    width: min(calc(100% - 2rem), 52rem);
  }

  main {
    padding: 1.5rem 0 2.5rem;
  }

  .site-footer__inner {
    align-items: center;
    flex-direction: column;
    text-align: center;
  }

  .site-header__inner {
    min-height: 0;
    padding: 0.75rem 0;
    flex-wrap: wrap;
    gap: 0.5rem 0.75rem;
  }

  .brand__logo {
    width: 2.25rem;
    height: 2.25rem;
  }

  .brand__name {
    font-size: 1.125rem;
  }

  .language-control {
    margin-left: auto;
  }

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

  .site-footer__inner {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}