/* Reset CSS */
body, h1, h2, h3, h4, h5, p, ul, li, img, figure, figcaption, figure, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}
body {
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img {
  max-width: 100%;
  height: auto;
}
ul {
  list-style: none;
}
a {
  text-decoration: none;
  color: inherit;
}

/* Mobile-first styles */
body {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background-color: #f5f7fa;
  color: #333;
  padding: 20px;
}

/* Header */
.headerClass {
  background-color: #005f73;
  padding: 10px;
  text-align: center;
}

.headerClass img {
  max-height: 60px;
}

/* Main Content */
.mainContentClass {
  margin-top: 20px;
}

/* Intro Section */
.introClass {
  background-color: #e0fbfc;
  padding: 20px;
  border-radius: 8px;
}

.introClass h1 {
  color: #023e8a;
  margin-bottom: 10px;
}

.introClass p {
  color: #0077b6;
  margin-bottom: 20px;
}

/* Description Section */
.descriptionClass {
  background-color: #caf0f8;
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

.descriptionClass h2 {
  color: #03045e;
  margin-bottom: 10px;
}

.descriptionClass p {
  color: #0077b6;
  margin-bottom: 20px;
}

/* Portfolio Section */
.portfolioClass {
  background-color: #ade8f4;
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

.portfolioClass h3 {
  color: #023e8a;
  margin-bottom: 10px;
}

.portfolioClass div img {
  margin: 10px 0;
  max-width: 100%;
}

/* List Section */
.listClass {
  background-color: #90e0ef;
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

.listClass h4 {
  color: #03045e;
  margin-bottom: 10px;
}

.listClass .list-item {
  color: #0077b6;
  margin-bottom: 5px;
  padding-left: 20px;
  position: relative;
}

.listClass .list-item:before {
  content: '•';
  position: absolute;
  left: 0;
  color: #0096c7;
}

/* Subscription Section */
.subscriptionClass {
  background-color: #48cae4;
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

.subscriptionClass h5 {
  color: #023e8a;
  margin-bottom: 10px;
}

.subscriptionClass form {
  display: flex;
  flex-direction: column;
}

.subscriptionClass input[type="email"] {
  padding: 10px;
  margin-bottom: 10px;
  border: 2px solid #0077b6;
  border-radius: 5px;
}

.subscriptionClass button {
  padding: 10px;
  background-color: #0096c7;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

/* Footer */
.footerClass {
  background-color: #028090;
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
  color: white;
}

.footerClass .contact-details, .footerClass .footer-links {
  margin-bottom: 10px;
}

.footerClass .footer-links a {
  display: inline-block;
  margin-right: 15px;
}

.footerClass .disclaimer-text {
  font-size: 0.8rem;
  line-height: 1.4;
}

/* Media Queries for larger screens */
@media (min-width: 768px) {
  .subscriptionClass form {
    flex-direction: row;
    align-items: center;
  }

  .subscriptionClass input[type="email"] {
    flex: 1;
    margin-right: 10px;
    margin-bottom: 0;
  }

  .subscriptionClass button {
    flex: 0 0 auto;
  }
}