* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  color: #333;
  background-color: #f8f9fa;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

/* 导航栏 */
.navbar {
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  padding: 1rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #2c3e50;
}

.navbar .logo span {
  color: #3498db;
}
/* 菜单链接 */
.navbar .nav-links {
  display: flex;
  gap: 2rem;
}

.navbar .nav-links a {
  font-size: 0.95rem;
  color: #666;
}


.navbar .nav-links a:hover {
  color: #3498db;
}

/* 首页横幅 */
.hero {
  background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
  color: #fff;
  padding: 4rem 5%;
  text-align: center;
  margin-bottom: 3rem;
}

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

.hero p {
  font-size: 1.1rem;
  max-width: 800px;
  margin: 0 auto;
  opacity: 0.9;
}


/* 返回首页按钮 */
.back-home {
  display: block;      /* 从 inline-block 改成 block */
  width: fit-content;  /* 宽度随内容 */
  margin: 2rem auto;   /* auto 实现水平居中 */
  padding: 0.6rem 1.2rem;
  background: #3498db;
  color: #fff;
  border-radius: 4px;
  transition: background 0.2s ease;
}
.back-home:hover {
  background: #2980b9;
  color: #fff;
}

/* 页脚 */
.footer {
  background-color: #2c3e50;
  color: #fff;
  padding: 2rem 5%;
  text-align: center;
  margin-top: 2rem;
}

.footer p {
  opacity: 0.8;
  font-size: 0.9rem;
}

/* 响应式适配（手机端） */
@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .nav-links {
    gap: 1rem;
  }
  .post-title {
    font-size: 1.6rem;
  }
}