:root {
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  background: #0b0d12;
  color: #f5f7fb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 80% 0%, rgba(90, 184, 255, 0.2), transparent 34rem),
    radial-gradient(circle at 0% 45%, rgba(114, 90, 255, 0.16), transparent 28rem),
    #0b0d12;
}

main {
  width: min(820px, calc(100% - 36px));
  margin: 0 auto;
  padding: 48px 0 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.brand {
  color: inherit;
  font-size: 18px;
  font-weight: 750;
  text-decoration: none;
}

.language-switcher {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.language-switcher button {
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: #9ca3b2;
  font: inherit;
  cursor: pointer;
}

.language-switcher button[aria-pressed="true"] {
  border-color: #5ab8ff;
  background: rgba(90, 184, 255, 0.18);
  color: #fff;
}

article {
  padding: clamp(26px, 6vw, 52px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 28px;
  background: rgba(20, 23, 32, 0.78);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(22px);
}

article[hidden] { display: none; }

.eyebrow {
  margin: 0 0 12px;
  color: #65c0ff;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

h1 {
  margin: 0;
  font-size: clamp(38px, 8vw, 62px);
  line-height: 1;
  letter-spacing: -0.045em;
}

.lead {
  margin: 20px 0 34px;
  color: #b4bbc8;
  font-size: 18px;
  line-height: 1.7;
}

h2 { margin: 32px 0 10px; font-size: 22px; }
h3 { margin: 24px 0 8px; font-size: 17px; }
p, li { color: #aab1bf; line-height: 1.7; }
ul, ol { padding-left: 1.35rem; }

a { color: #70c4ff; }

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  border: 1px solid rgba(90, 184, 255, 0.24);
  border-radius: 16px;
  background: rgba(90, 184, 255, 0.08);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.button {
  display: inline-block;
  padding: 11px 15px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  color: #f5f7fb;
  font-weight: 650;
  text-decoration: none;
}

.button.primary { border-color: transparent; background: #3478f6; }

.meta { margin-top: 30px; color: #737b89; font-size: 13px; }

footer {
  padding: 24px 10px 0;
  color: #59606e;
  font-size: 13px;
  text-align: center;
}

@media (max-width: 560px) {
  main { padding-top: 24px; }
  .topbar { align-items: flex-start; flex-direction: column; }
  .language-switcher { justify-content: flex-start; }
  .actions { flex-direction: column; }
  .button { text-align: center; }
}