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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #f0f0f0;
  padding: 20px;
}

article {
  max-width: 900px;
  margin: 0 auto;
  background: #ffffff;
  padding: 40px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header {
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 3px solid #ff6b6b;
}

h1 {
  font-size: 2.5rem;
  text-align: right;
  color: #ff6b6b;
  line-height: 1.2;
  margin-bottom: 10px;
}

h2 {
  font-size: 1.8rem;
  text-align: right;
  color: #4ecdc4;
  margin: 40px 0 20px 0;
  padding-right: 10px;
  border-right: 5px solid #ffe66d;
}

h3 {
  font-size: 1.4rem;
  text-align: right;
  color: #ff6b6b;
  margin: 20px 0 15px 0;
}

p {
  margin-bottom: 20px;
  text-align: left;
}

section {
  margin-bottom: 50px;
}

section.intro p {
  font-size: 1.1rem;
  color: #555;
  font-style: italic;
}

a {
  color: #4ecdc4;
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid #ffe66d;
  transition: all 0.3s ease;
}

a:hover {
  color: #ff6b6b;
  border-bottom-color: #ff6b6b;
}

aside.cta-box {
  background: #fffef0;
  border-left: 6px solid #ffe66d;
  padding: 30px;
  margin: 40px 0;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

aside.cta-box h3 {
  text-align: left;
  color: #ff6b6b;
  margin-top: 0;
  margin-bottom: 15px;
}

aside.cta-box p {
  margin-bottom: 15px;
}

aside.cta-box p:last-child {
  margin-bottom: 0;
}

footer {
  margin-top: 60px;
  padding-top: 30px;
  border-top: 2px solid #4ecdc4;
  text-align: center;
  color: #999;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  article {
    padding: 20px;
  }

  h1 {
    font-size: 1.8rem;
    text-align: left;
  }

  h2 {
    font-size: 1.4rem;
    text-align: left;
    border-right: none;
    border-left: 5px solid #ffe66d;
    padding-left: 10px;
    padding-right: 0;
  }

  h3 {
    font-size: 1.2rem;
    text-align: left;
  }

  aside.cta-box {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.2rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  section.intro p {
    font-size: 1rem;
  }
}