:root {
  color-scheme: light dark;
  --background: #f4f7fb;
  --surface: #ffffff;
  --surface-soft: #edf4f8;
  --text: #162231;
  --muted: #526276;
  --accent: #086c80;
  --accent-strong: #034b5a;
  --border: #ccd9e2;
  --shadow: 0 12px 34px rgb(20 52 68 / 10%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #171a1f;
    --surface: #23272f;
    --surface-soft: #1c242b;
    --text: #eef3f8;
    --muted: #b5c1ce;
    --accent: #66d9ef;
    --accent-strong: #a9edf7;
    --border: #3b4653;
    --shadow: 0 12px 34px rgb(0 0 0 / 25%);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: Inter, "Segoe UI", Tahoma, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.68;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-strong); }
a:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  top: -5rem;
  z-index: 10;
  padding: .7rem 1rem;
  background: var(--surface);
  border: 2px solid var(--accent);
}
.skip-link:focus { top: 1rem; }

header {
  background: linear-gradient(145deg, #052c5e, #087c92);
  color: #fff;
  padding: 3.3rem 1.25rem 2.7rem;
}

.header-inner, main, footer {
  width: min(100% - 2rem, 980px);
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 .45rem;
  color: #b9f2fb;
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 { margin: 0; font-size: clamp(2rem, 7vw, 3.4rem); line-height: 1.12; }
.subtitle { max-width: 700px; margin: .8rem 0 0; color: #e3f8fc; }

.language-nav { margin-top: 1.35rem; }
.language-nav a {
  display: inline-block;
  padding: .42rem .75rem;
  border: 1px solid rgb(255 255 255 / 55%);
  border-radius: 999px;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

main { padding: 2rem 0 3rem; }

.summary, section, nav.contents {
  margin-bottom: 1rem;
  padding: clamp(1.1rem, 4vw, 1.7rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.summary { border-inline-start: 5px solid var(--accent); }

h2, h3 { line-height: 1.3; }
h2 { margin: 0 0 .75rem; font-size: 1.42rem; }
h3 { margin: 1.25rem 0 .35rem; font-size: 1.08rem; }
p { margin: .55rem 0 1rem; }
ul, ol { padding-inline-start: 1.35rem; }
li + li { margin-top: .38rem; }

.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: .75rem;
  margin-top: 1.4rem;
}
.meta div {
  padding: .75rem .9rem;
  background: rgb(255 255 255 / 10%);
  border: 1px solid rgb(255 255 255 / 25%);
  border-radius: 10px;
}
.meta strong { display: block; font-size: .8rem; color: #c8f4fb; }

.contents ol { columns: 2 280px; }
.contents li { break-inside: avoid; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { padding: .78rem; border: 1px solid var(--border); vertical-align: top; text-align: start; }
th { background: var(--surface-soft); }

.note {
  padding: .85rem 1rem;
  background: var(--surface-soft);
  border-inline-start: 4px solid var(--accent);
  border-radius: 8px;
}

code { padding: .12rem .32rem; background: var(--surface-soft); border-radius: 4px; }

footer { padding: 0 0 3rem; color: var(--muted); text-align: center; font-size: .9rem; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  header { padding-top: 2.5rem; }
  .summary, section, nav.contents { border-radius: 12px; }
  th, td { min-width: 160px; }
}

@media print {
  :root { --background: #fff; --surface: #fff; --text: #000; --muted: #333; --border: #aaa; }
  header { background: #fff; color: #000; padding: 1rem 0; }
  .subtitle, .eyebrow, .meta strong { color: #000; }
  .language-nav, .skip-link { display: none; }
  .summary, section, nav.contents { box-shadow: none; break-inside: avoid; }
  a { color: #000; }
}