body {
  font-size: 17px;
}

h1, h2, h3 {
  font-weight: 700;
}

.navbar-title {
  font-weight: 600;
}

.hero {
  max-width: 950px;
  margin: 3rem auto 4rem auto;
  padding: 2.5rem;
  border-radius: 18px;
  background: #f7f7f9;
  border: 1px solid #e5e5e5;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 0.2rem;
}

.hero h2 {
  font-size: 1.4rem;
  color: #666;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero p {
  font-size: 1.1rem;
}

.btn {
  margin-right: 0.4rem;
  margin-top: 0.6rem;
}

.paper-card {
  padding: 1.5rem;
  border: 1px solid #e0e0e0;
  border-radius: 14px;
  background: #fafafa;
  margin-top: 1rem;
  margin-bottom: 2rem;
}