:root {
  color-scheme: light dark;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: #f4f7fb;
  color: #172033;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  line-height: 1.65;
}

main {
  width: min(860px, calc(100% - 32px));
  margin: 48px auto;
  padding: 42px;
  background: #ffffff;
  border: 1px solid #dfe5ee;
  border-radius: 18px;
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
}

h1, h2 {
  line-height: 1.25;
}

h1 {
  margin-top: 0;
  font-size: clamp(2rem, 5vw, 2.8rem);
}

h2 {
  margin-top: 34px;
  font-size: 1.25rem;
}

a {
  color: #155eef;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.meta,
.note,
footer {
  color: #607087;
}

.note {
  padding: 14px 16px;
  background: #f6f8fb;
  border-left: 4px solid #91a4bf;
  border-radius: 8px;
}

footer {
  margin-top: 42px;
  padding-top: 20px;
  border-top: 1px solid #dfe5ee;
  font-size: 0.92rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    background: #0c111b;
    color: #e8edf5;
  }

  main {
    background: #121a27;
    border-color: #263247;
    box-shadow: none;
  }

  a {
    color: #8ab4ff;
  }

  .meta,
  .note,
  footer {
    color: #a9b5c6;
  }

  .note {
    background: #182233;
    border-left-color: #627da7;
  }

  footer {
    border-color: #263247;
  }
}

@media (max-width: 640px) {
  main {
    width: 100%;
    min-height: 100vh;
    margin: 0;
    padding: 26px 22px;
    border: 0;
    border-radius: 0;
  }
}