:root {
  color-scheme: light;
  background: #eef1f5;
  color: #24272b;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  display: grid;
  place-items: center;
  padding: 2rem;
  background: linear-gradient(140deg, #eef1f5 0%, #dfe5ea 100%);
}

.layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 1.5rem;
  width: min(900px, 100%);
}

.sidebar {
  display: grid;
  gap: 1rem;
  padding: 2rem;
  border-radius: 28px;
  background: #ffffff;
  border: 1px solid rgba(36, 39, 43, 0.08);
  box-shadow: 0 22px 56px rgba(0, 0, 0, 0.06);
}

.subtitle {
  margin: 0;
  color: #7a7f87;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.8rem;
}

.sidebar h1 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  line-height: 1.3;
}

.sidebar p {
  margin: 0;
  color: #4e545c;
  line-height: 1.7;
}

.content {
  display: grid;
  gap: 1.5rem;
  padding: 2rem;
  border-radius: 28px;
  background: #ffffff;
  border: 1px solid rgba(36, 39, 43, 0.08);
  box-shadow: 0 22px 56px rgba(0, 0, 0, 0.06);
}

.highlight {
  padding: 1rem 1.25rem;
  border-radius: 18px;
  background: #f4fbff;
  color: #1b4a6b;
  font-weight: 600;
  width: fit-content;
}

.feature-list {
  display: grid;
  gap: 1rem;
}

.feature-list article {
  padding: 1.2rem 1.1rem;
  border-radius: 18px;
  background: #f7f8fb;
  border: 1px solid rgba(36, 39, 43, 0.06);
}

.feature-list h2 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.feature-list p {
  margin: 0;
  color: #4e545c;
  line-height: 1.75;
}

footer {
  display: grid;
  gap: 0.55rem;
}

footer p {
  margin: 0;
  color: #4e545c;
}

footer a {
  color: #1b4a6b;
  text-decoration: none;
  font-weight: 600;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  body {
    padding: 1rem;
  }

  .sidebar,
  .content {
    padding: 1.5rem;
  }

  .sidebar h1 {
    font-size: 2rem;
  }
}