* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background: #f4f6f9;
  color: #222;
}

header {
  background: #00838f;
  color: white;
}

nav {
  display: flex;
  justify-content: center;
  background: #222;
  flex-wrap: wrap;
}

nav a {
  color: white;
  padding: 14px 20px;
  text-decoration: none;
}

a {
  color: #00838f;
  text-decoration: none;
}

a:hover {
  color: #005c65;
  text-decoration: underline;
}

nav a:hover,
.navbar-dark .navbar-nav .nav-link:hover {
  background: #006670;
}

.container {
  padding: 20px;
  max-width: 1100px;
  margin: auto;
}

.card {
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
  margin-bottom: 20px;
  border: none;
}

.card.border-primary {
  border-top: 4px solid #00838f;
}

.hero-card {
  background: linear-gradient(135deg, #005c65 0%, #00838f 100%);
  color: white;
}

.question-card {
  border-left: 4px solid #00838f;
}

.question {
  margin-bottom: 18px;
}

.question p {
  margin-bottom: 12px;
}

.answer {
  display: none;
  color: #0f5132;
  margin-top: 10px;
  background: #d1e7dd;
  padding: 12px;
  border-radius: 8px;
}

.btn-primary {
  background: #00838f;
  border-color: #00838f;
}

.btn-primary:hover {
  background: #006670;
  border-color: #005c65;
}

footer {
  background: #00838f;
  color: white;
  text-align: center;
  padding: 20px;
  margin-top: 30px;
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    text-align: center;
  }
}