:root {
  color-scheme: dark;
  --canvas: #070a0e;
  --surface: #111820;
  --raised: #18222c;
  --text: #f4f7f8;
  --muted: #aab4bd;
  --accent: #56d4c1;
  --attention: #ffbd45;
  --line: rgba(255, 255, 255, 0.1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.58;
}

main {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 64px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 44px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--accent);
  background: var(--surface);
}

nav { display: flex; gap: 14px; }
nav a, .language-links a, a { color: var(--accent); }
nav a { font-size: 0.92rem; text-decoration: none; }

.eyebrow {
  margin: 0 0 10px;
  color: var(--attention);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h1 {
  max-width: 680px;
  margin: 0 0 14px;
  font-size: clamp(2.25rem, 8vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.lead {
  max-width: 650px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 1.12rem;
}

.language-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
}

.language-links a {
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.86rem;
  text-decoration: none;
}

section, details {
  margin: 14px 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
}

section:target, details:target { border-color: var(--accent); }

h2 { margin: 0 0 12px; font-size: 1.45rem; }
h3 { margin: 24px 0 8px; font-size: 1.04rem; }
p, li { color: var(--muted); }
ul { padding-left: 20px; }
strong { color: var(--text); }

summary {
  cursor: pointer;
  font-size: 1.15rem;
  font-weight: 750;
}

.notice {
  border-color: rgba(255, 189, 69, 0.35);
  background: rgba(255, 189, 69, 0.07);
}

footer {
  margin-top: 32px;
  color: var(--muted);
  font-size: 0.86rem;
}

@media (max-width: 560px) {
  header { align-items: flex-start; flex-direction: column; margin-bottom: 34px; }
  section, details { padding: 18px; border-radius: 18px; }
}