body {
  margin: 0;
  padding: 0;
  font-family: 'Helvetica Neue', sans-serif;
  background: #fdfdfd;
  color: #1f1f1f;
}

.site-header {
  background: linear-gradient(135deg, #d6e4f0, #f0f4fc);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #c9d6e3;
}

.site-header h1 {
  font-size: 2rem;
  margin: 0;
  color: #1B263B;
}

.site-nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: #264d73;
  font-weight: 500;
}

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

.site-subtitle {
  text-align: center;
  color: #4F6272;
  margin-top: 0.5rem;
}

.content {
  max-width: 1000px;
  margin: auto;
  padding: 2rem 1rem;
}

.blog h2 {
  color: #1a2e45;
}

.blog h3 {
  margin-top: 2rem;
  color: #2c3e5e;
}

.blog a {
  color: #3869D4;
  text-decoration: none;
  font-weight: bold;
}

.blog a:hover {
  text-decoration: underline;
}

.download-btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 12px 24px;
  background-color: #1B263B;
  color: #ffffff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  transition: background-color 0.3s ease;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.download-btn:hover {
  background-color: #102030;
}

.affiliate-cards {
  margin-top: 4rem;
  padding: 2rem 1rem;
  background: #eef2f8;
  border-top: 2px solid #c0d6ea;
}

.affiliate-cards h2 {
  text-align: center;
  color: #1a2d44;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: white;
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  text-align: center;
  border: 1px solid #e3e8ee;
}

.card h3 {
  margin-top: 0;
  color: #264d73;
}

.card a {
  display: inline-block;
  margin-top: 10px;
  color: #264d73;
  font-weight: bold;
}

.site-footer {
  text-align: center;
  padding: 2rem 1rem;
  background: #f5f6fa;
  font-size: 0.95rem;
  color: #445566;
  border-top: 1px solid #dcdcdc;
}