body {
  font-family: 'Helvetica', sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  color: #111827;
}

header {
  background: #4F46E5;
  color: white;
  text-align: center;
  padding: 6em 2em 4em;
  position: relative;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1em;
}

.logo {
  width: 50px;
  height: 50px;
}

header h1 {
  font-size: 3em;
  margin: 0.2em 0;
}

header p {
  font-size: 1.2em;
  margin: 0.5em 0 2em;
}

header button {
  background: #fff;
  color: #4F46E5;
  border: none;
  padding: 1em 2em;
  font-size: 1em;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.2s;
}

header button:hover {
  background: #e0e0ff;
}

section.features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2em;
  padding: 4em 2em;
}

section.features .card {
  flex: 1 1 250px;
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  padding: 2em;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
  transition: transform 0.2s;
}

section.features .card:hover {
  transform: translateY(-5px);
}

section.features h3 {
  margin-bottom: 1em;
  color: #4F46E5;
}

section.features p {
  color: #6B7280;
}

footer {
  background: #f9f9f9;
  text-align: center;
  padding: 2em;
  color: #6B7280;
}

footer a {
  color: #4F46E5;
  text-decoration: none;
}

.accent {
  display: block;
  font-weight: 700;
  color: #14b8a6;
  transition: opacity 0.4s ease;
  opacity: 1;
  margin-top: 1rem;
}

.fade-out {
  opacity: 0;
}