コードエディター

<div class="card">
  <div class="card-header">
    <h2 class="title">Welcome to Code-to-PNG!</h2>
    <p class="subtitle">Create beautiful images from your code</p>
  </div>
  
  <div class="card-body">
    <div class="feature">
      <div class="feature-icon">🎨</div>
      <h3>Style Presets</h3>
      <p>Choose from Default, Card, macOS, or Terminal styles</p>
    </div>
    
    <div class="feature">
      <div class="feature-icon">📱</div>
      <h3>Live WYSIWYG</h3>
      <p>See exactly what your export will look like</p>
    </div>
    
    <div class="feature">
      <div class="feature-icon">⚡</div>
      <h3>Quick Export</h3>
      <p>One-click export buttons for each section</p>
    </div>
  </div>
  
  <div class="card-footer">
    <button class="btn-primary">Get Started</button>
    <button class="btn-secondary">Learn More</button>
  </div>
</div>

.card {
  max-width: 600px;
  margin: 20px auto;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.1);
  color: white;
  overflow: hidden;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.card-header {
  padding: 40px 40px 20px;
  text-align: center;
}

.title {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0 0 10px 0;
  background: linear-gradient(45deg, #fff, #e0e7ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  margin: 0;
  font-weight: 300;
}

.card-body {
  padding: 20px 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 30px;
}

.feature {
  text-align: center;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 15px;
  display: block;
}

.feature h3 {
  font-size: 1.3rem;
  margin: 0 0 10px 0;
  font-weight: 600;
}

.feature p {
  font-size: 0.95rem;
  opacity: 0.8;
  margin: 0;
  line-height: 1.5;
}

.card-footer {
  padding: 30px 40px 40px;
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
  padding: 12px 24px;
  border-radius: 25px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: rgba(255,255,255,0.2);
  color: white;
  border-color: rgba(255,255,255,0.3);
}

.btn-primary:hover {
  background: rgba(255,255,255,0.3);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.btn-secondary {
  background: transparent;
  color: white;
  border-color: rgba(255,255,255,0.5);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

@media (max-width: 640px) {
  .card {
    margin: 10px;
    border-radius: 15px;
  }
  
  .card-header {
    padding: 30px 20px 15px;
  }
  
  .title {
    font-size: 2rem;
  }
  
  .card-body {
    padding: 15px 20px;
    gap: 20px;
  }
  
  .card-footer {
    padding: 20px;
    flex-direction: column;
  }
}