:root {
  color-scheme: light dark;
  --canvas: #f5f1e7;
  --paper: #fffdf8;
  --ink: #27231f;
  --muted: #62574c;
  --link: #102f76;
  --button-ink: #fffdf8;
  --line: #cfc4b1;
  --gold: #edc56e;
  --focus: #102f76;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #17140f;
    --paper: #211d17;
    --ink: #f3eee4;
    --muted: #c2b5a4;
    --link: #acbff7;
    --button-ink: #13264d;
    --line: #574c3d;
    --focus: #edc56e;
  }
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 1rem/1.7 system-ui, -apple-system, BlinkMacSystemFont, "PingFang TC", sans-serif;
  overflow-wrap: anywhere;
}

a { color: var(--link); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 0.14em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
img { display: block; max-inline-size: 100%; height: auto; }
h1, h2, h3, h4 { line-height: 1.24; }
h1 { margin: 0 0 1.1rem; font-size: clamp(2.3rem, 6vw, 4.4rem); letter-spacing: -0.045em; }
h2 { margin: 0 0 0.75rem; font-size: clamp(1.35rem, 2.6vw, 1.85rem); }
p { margin-block: 0 0.75rem; }

.wrap { width: min(100% - 2.5rem, 60rem); margin-inline: auto; }
.site-header, .site-footer { background: var(--paper); }
.site-header { border-bottom: 1px solid var(--line); }
.header-inner, .site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  padding-block: 0.65rem;
}

.brand, .site-nav, .site-nav a, .site-footer a, .language-nav a, .skip-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.brand, .site-nav a, .site-footer a, .language-nav a { min-block-size: 44px; }
.brand { color: var(--ink); font-size: 1.2rem; font-weight: 720; text-decoration: none; }
.site-nav, .language-nav { flex-wrap: wrap; gap: 0 1rem; }
.site-nav a { min-inline-size: 44px; font-size: 0.9rem; text-decoration-color: transparent; }
.site-nav a:hover, .site-nav [aria-current="page"] { text-decoration-color: currentColor; }
.site-nav [aria-current="page"] { font-weight: 700; }

.skip-link {
  position: absolute;
  z-index: 1;
  inset-block-start: 0.5rem;
  inset-inline-start: 0.5rem;
  min-block-size: 44px;
  padding: 0.35rem 0.65rem;
  background: var(--paper);
  transform: translateY(-160%);
}

.skip-link:focus { transform: none; }

main { padding-block: clamp(2rem, 7vw, 5rem) clamp(2.5rem, 7vw, 4rem); }
.hero { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: clamp(1.4rem, 5vw, 4rem); }
.page-intro { max-inline-size: 42rem; }
.subtitle { font-size: clamp(1.15rem, 2.5vw, 1.45rem); }
.translation, .detail h2 span, .features span { color: var(--muted); }
.translation { max-inline-size: 45ch; }
.page-intro h1 span { display: block; color: var(--muted); font-size: 0.4em; letter-spacing: normal; margin-block-start: 0.35rem; }

.button {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem 0.5rem;
  min-block-size: 44px;
  max-inline-size: 100%;
  padding: 0.65rem 1rem;
  margin-block-start: 0.5rem;
  border-radius: 0.35rem;
  background: var(--link);
  color: var(--button-ink);
  font-weight: 660;
}

.cover {
  display: grid;
  place-items: center;
  min-block-size: 13rem;
  padding: 1.5rem;
  border-radius: 0.5rem;
  background: var(--gold);
}

.cover img { inline-size: clamp(4rem, 19vw, 8rem); }
.detail { margin-block-start: clamp(1.75rem, 4vw, 3rem); padding-block-start: 1.4rem; border-top: 1px solid var(--line); }
.detail h2 span, .features span { display: block; margin-block-start: 0.22rem; font-size: 0.8em; font-weight: 550; }
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem 1.6rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.features li { padding-block-start: 0.65rem; border-top: 2px solid var(--link); }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }

.policy { max-inline-size: 48rem; }
.language-nav { display: flex; margin-block: 1rem; padding-block: 0.25rem; border-block: 1px solid var(--line); }
.language-nav a { min-inline-size: 44px; justify-content: center; }
.policy-copy section { padding-block-start: 1.5rem; }
.policy-copy :is(h2, h3, h4, h5) { margin-block: 1.5em 0.65em; }
.policy-copy ul, .policy-copy ol { padding-inline-start: 1.4em; }
.policy-copy table { width: 100%; border-collapse: collapse; table-layout: fixed; }
.policy-copy :is(th, td) { padding: 0.5rem; border: 1px solid var(--line); text-align: start; vertical-align: top; overflow-wrap: anywhere; }
.policy-copy :is(th, td):first-child { width: 28%; }
.policy-copy th { background: var(--paper); }
.policy-copy hr { border: 0; border-top: 1px solid var(--line); margin-block: 2rem; }
.policy-copy [id] { scroll-margin-block-start: 1rem; }

@media (max-width: 42rem) {
  .wrap { width: min(100% - 2rem, 60rem); }
  .hero, .features { grid-template-columns: minmax(0, 1fr); }
  .cover { min-block-size: 6rem; padding: 1rem; }
  .features { gap: 0.8rem; }
  .features li { border-top-width: 1px; }
}