:root {
  --bg: #050a15;
  --bg-soft: #0c1730;
  --panel: rgba(15, 24, 47, 0.88);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f3f7ff;
  --muted: #b2c0dc;
  --blue: #77b2ff;
  --max: 920px;
}

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 8%, rgba(119, 178, 255, 0.12), transparent 34%),
    radial-gradient(circle at 92% 22%, rgba(92, 230, 214, 0.1), transparent 44%),
    var(--bg);
  font-family: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(var(--max), calc(100% - 28px));
  margin: 24px auto 48px;
}

.top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.back {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 10px;
  padding: 8px 12px;
  color: var(--text);
}

.card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  padding: 20px;
}

h1 {
  margin: 0;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.meta {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

section {
  margin-top: 22px;
}

h2 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
  color: var(--muted);
}

ul {
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

li + li {
  margin-top: 4px;
}

.foot {
  margin-top: 24px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .card {
    padding: 16px;
  }
}