:root {
  color-scheme: dark;
  --bg: #0e1320;
  --surface: #151c2c;
  --ink: #eef1f7;
  --muted: #9aa6bd;
  --line: rgba(255, 255, 255, 0.09);
  --accent: #8fb4ff;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100vh;
  padding: 2.5rem 1.25rem;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  color: var(--ink);
  background:
    radial-gradient(55rem 38rem at 12% -12%, #1b2a4d 0%, transparent 62%),
    radial-gradient(45rem 32rem at 105% 4%, #2a2038 0%, transparent 58%),
    var(--bg);
}
main {
  width: 100%;
  max-width: 42rem;
  margin: 0 auto;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012));
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: clamp(2.1rem, 5vw, 3.5rem);
  box-shadow: 0 40px 90px -45px rgba(0, 0, 0, 0.9);
}
.mark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
}
.mark::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}
h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  font-size: clamp(1.8rem, 4.6vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 1.5rem 0 0.5rem;
}
h2 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
  color: var(--ink);
}
p,
li {
  color: var(--muted);
}
ul {
  padding-left: 1.2rem;
}
a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 180, 255, 0.35);
}
a:hover {
  border-bottom-color: currentColor;
}
.back {
  display: inline-block;
  margin-top: 2.5rem;
  font-size: 0.9rem;
}