:root {
  --bg: #f3f5fa;
  --text: #0e1526;
  --muted: #5b667e;
  --accent: #0a7cff;
  --line: rgb(15 23 42 / 0.08);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Inter, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background:
    radial-gradient(900px 520px at 6% -10%, rgb(160 200 255 / 0.9), transparent 62%),
    radial-gradient(780px 520px at 98% 2%, rgb(255 186 222 / 0.7), transparent 60%),
    radial-gradient(900px 640px at 72% 110%, rgb(160 226 255 / 0.8), transparent 62%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

.card {
  background: linear-gradient(160deg, rgb(255 255 255 / 0.8), rgb(255 255 255 / 0.55));
  backdrop-filter: blur(22px) saturate(180%);
  border-radius: 24px;
  padding: 32px;
  box-shadow:
    inset 0 1px 0 rgb(255 255 255 / 0.95),
    0 12px 36px -14px rgb(16 24 64 / 0.22);
}

header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

header img {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  box-shadow: 0 6px 16px -6px rgb(10 124 255 / 0.7);
}

header a {
  color: inherit;
  text-decoration: none;
  font-weight: 650;
  font-size: 20px;
}

nav {
  margin-left: auto;
  display: flex;
  gap: 16px;
  font-size: 14px;
}

nav a,
a {
  color: var(--accent);
}

h1 {
  font-size: 30px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

h2 {
  font-size: 19px;
  margin: 28px 0 6px;
}

p,
li {
  color: var(--text);
}

.muted {
  color: var(--muted);
  font-size: 14px;
}

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 36px 0;
}

.lang {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
}

footer {
  margin-top: 28px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 560px) {
  .card {
    padding: 22px;
  }
  nav {
    display: none;
  }
}