body {
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  background: #f8fafd;
  color: #222;
  line-height: 1.6;
}
header {
  background: #24b8a6;
  color: white;
  padding: 2rem 1rem 1rem 1rem;
  text-align: center;
}
header .subtitle {
  margin-top: 0.5rem;
  font-size: 1.2rem;
  color: #e0fff9;
}
main {
  max-width: 700px;
  background: white;
  margin: 2rem auto;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 18px rgba(30,47,70, 0.07);
}
h1 {
  margin: 0 0 1rem 0;
}
h2 {
  margin-top: 2rem;
  color: #24b8a6;
  font-size: 1.5rem;
}
ul, ol {
  margin-left: 1.2rem;
  padding-left: 0.6rem;
}
li {
  margin-bottom: 0.5rem;
}
.tip, .note {
  background: #e7fcf8;
  border-left: 4px solid #24b8a6;
  padding: 0.8rem 1rem;
  margin: 1rem 0;
  border-radius: 6px;
}
.bonus {
  background: #f2fff8;
  border: 1px dashed #24b8a6;
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
}
footer {
  text-align: center;
  background: #e8f6f1;
  font-size: 1rem;
  padding: 1rem;
  color: #24b8a6;
  border-top: 1px solid #bfeee1;
}
@media (max-width: 750px) {
  main {
    padding: 1rem;
    margin: 1rem;
  }
  h1 { font-size: 1.4rem; }
  h2 { font-size: 1.1rem; }
}