body {
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, 'Liberation Sans', sans-serif;
  margin: 0;
  background: #f6f8fa;
  color: #24292f;
}
.header {
  background: #24292f;
  color: #fff;
  padding: 0.5rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.03);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}
.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
  text-decoration: none;
}
.nav a {
  color: #fff;
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 1rem;
  transition: color 0.2s;
}
.nav a:hover {
  color: #58a6ff;
}
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}
.hero {
  background: #fff;
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  text-align: center;
}
.hero h1 {
  margin-top: 0;
  font-size: 2.2rem;
}
.subtitle {
  color: #57606a;
  font-size: 1.1rem;
  margin-top: 0.5rem;
}
.article-list {
  background: #fff;
  border-radius: 8px;
  padding: 1.5rem 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  margin-bottom: 2rem;
}
.article-list li {
  margin-bottom: 0.7rem;
  font-size: 1.08rem;
}
.article-list a {
  color: #0969da;
  text-decoration: none;
  font-weight: 500;
}
.article-list a:hover {
  text-decoration: underline;
}
.footer {
  background: #24292f;
  color: #fff;
  text-align: center;
  padding: 1rem 0;
  margin-top: 2rem;
}