* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
  line-height: 1.8;
  color: #1a1a2e;
  background: #f8f9fc;
}

h1 {
  font-size: 2.2em;
  color: #0f0f2e;
  margin-bottom: 20px;
  line-height: 1.3;
  border-bottom: 3px solid #7c3aed;
  padding-bottom: 12px;
}

h2 {
  font-size: 1.5em;
  color: #1a1a2e;
  margin: 36px 0 14px;
  line-height: 1.4;
}

h3 {
  font-size: 1.2em;
  color: #2d2d5e;
  margin: 28px 0 12px;
}

p {
  margin-bottom: 18px;
}

a {
  color: #7c3aed;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: #5b21b6;
}

ul {
  margin: 0 0 18px 24px;
}

li {
  margin-bottom: 8px;
  line-height: 1.6;
}

strong {
  color: #0f0f2e;
}

code {
  background: #e8e4f0;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: #5b21b6;
}

hr {
  margin: 40px 0 20px;
  border: none;
  border-top: 2px solid #e0dce8;
}

footer {
  text-align: center;
  font-size: 14px;
  color: #6b6b8a;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #e0dce8;
}

footer a {
  color: #6b6b8a;
}

footer a:hover {
  color: #7c3aed;
}

@media (max-width: 600px) {
  body {
    margin: 20px auto;
    padding: 16px;
    line-height: 1.7;
  }

  h1 {
    font-size: 1.6em;
  }

  h2 {
    font-size: 1.3em;
  }
}