html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: #ffffff;
  color: #111;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}
header {
  background: #ffffff;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #009485; /* Sea green */
}
nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: #111;
  font-weight: 600;
}
.hero {
  padding: 4rem 2rem;
  text-align: center;
  background: #f5f5f5;
}
.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: #009485;
}
.hero p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto 2rem;
}
.cta input[type=email] {
  padding: 0.75rem;
  font-size: 1rem;
  width: 250px;
  max-width: 100%;
  margin-right: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}
.cta button {
  padding: 0.8rem 1.2rem;
  font-size: 1rem;
  background: #009485;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
section {
  padding: 3rem 2rem;
  text-align: center;
}
.features, .audiences {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  max-width: 960px;
  margin: 0 auto;
}
.feature, .audience {
  max-width: 280px;
}
footer {
  background: #111;
  color: white;
  text-align: center;
  padding: 2rem;
  font-size: 0.9rem;
  margin-top: auto;
}
footer a {
  color: #fff;
  margin: 0 0.5rem;
  text-decoration: none;
}

.cta-button {
  background-color: #009485; /* Sea green */
  color: white;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  /* Remove underline */
  text-decoration: none;
}
.cta-button:hover {
  background-color: #007f6b; /* Darker sea green */
}
.cta-button:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(0, 148, 133, 0.5); /* Sea green shadow */
}
.cta-button:active {
  background-color: #007f6b; /* Darker sea green */
}
.cta-button:disabled {
  background-color: #ccc; /* Grey */
  cursor: not-allowed;
}