body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f7f9fb;
  color: #1f2937;
  line-height: 1.6;
}

.header {
  background: #0f766e;
  color: white;
  padding: 18px 24px;
}

.header h1 {
  margin: 0;
  font-size: 20px;
}

.nav {
  margin-top: 8px;
}

.nav a {
  color: #ccfbf1;
  margin-right: 16px;
  text-decoration: none;
  font-size: 14px;
}

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

.container {
  max-width: 900px;
  margin: 40px auto;
  background: white;
  padding: 40px 28px;
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

h1, h2 {
  color: #0f766e;
}

.meta {
  color: #6b7280;
}

.box {
  background: #f0fdfa;
  border: 1px solid #ccfbf1;
  padding: 18px;
  border-radius: 10px;
  margin-top: 24px;
}