* {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  margin: 0;
  background-color: #f7fbfb;
  color: #1f2933;
}

/* Header */
header {
  padding: 36px;
  background-color: #ffffff;
  border-bottom: 2px solid #0ea5a5;
}

header h1 {
  margin-bottom: 8px;
  color: #0ea5a5;
}

header p {
  color: #4b5563;
}

/* Main */
main {
  padding: 36px;
}

/* Grid layout */
.modules {
  max-width: 1200px;
  margin: auto;

  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

/* Card */
.card {
  background-color: #ffffff;
  border: 1px solid #d1f0f0;
  padding: 24px;
  border-radius: 6px;

  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Card text */
.card h2 {
  margin-top: 0;
  margin-bottom: 12px;
  color: #0ea5a5;
}

.card p {
  line-height: 1.7;
  color: #374151;
  margin-bottom: 22px;
}

/* Button */
.btn {
  align-self: flex-start;
  padding: 12px 22px;
  background-color: #0ea5a5;
  color: #ffffff;
  border: none;
  border-radius: 4px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}

.btn:hover {
  background-color: #0b8f8f;
}

/* Footer */
footer {
  margin-top: 48px;
  padding: 22px;
  background-color: #ffffff;
  border-top: 1px solid #d1f0f0;
  font-size: 0.9rem;
  color: #4b5563;
  text-align: center;
}