body {
  font-family: 'Quicksand', sans-serif;
  margin: 0;
  background-color: #fdfdfd;
  color: #222;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}

.header {
  background: #fff;
  border-bottom: 1px solid #eee;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  height: 75px;
}

.nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

.nav .login-btn {
  background: #222;
  color: #fff;
  padding: 8px 15px;
  border-radius: 8px;
}

.hero {
  text-align: center;
  padding: 4rem 1rem;
  background: linear-gradient(to right, #f3f4f6, #e0f7fa);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.hero-buttons .btn {
  padding: 0.8rem 1.5rem;
  margin: 0 10px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
}

.btn.primary {
  background: #222;
  color: white;
}

.btn.secondary {
  background: #ddd;
  color: #222;
}

.btn.small {
  padding: 0.5rem 1rem;
  display: inline-block;
  margin-top: 10px;
}

.tests {
  padding: 3rem 1rem;
  background: #f9f9f9;
}

.tests h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
}

.test-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.test-card {
  background: white;
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: 0 3px 8px rgba(0,0,0,0.05);
  text-align: center;
}

.cta {
  background: #e3f2fd;
  padding: 3rem 1rem;
  text-align: center;
}

.cta h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.footer {
  background: #111;
  color: #ccc;
  padding: 2rem 1rem;
  text-align: center;
}

.footer-nav a {
  color: #ccc;
  margin: 0 10px;
  text-decoration: none;
}

.footer-nav a:hover {
  text-decoration: underline;
}