/* 全局重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #333;
  line-height: 1.6;
  background: #f8f9fa;
}

/* 导航栏 */
.navbar {
  background: #1e293b;
  padding: 0 1rem;
}
.nav-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.nav-logo {
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  font-size: 1.1rem;
}
.nav-menu {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}
.nav-menu a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}
.nav-menu a:hover { color: #fff; }

/* 首页 hero 区 */
.hero {
  text-align: center;
  padding: 3rem 1rem 2rem;
}
.hero-img {
  width: 160px;
  max-width: 50vw;
  height: auto;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
}
.hero p {
  color: #64748b;
  max-width: 480px;
  margin: 0 auto;
}

/* 内容区 */
.content {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}
.content h1 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.content h2 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
  border-left: 4px solid #3b82f6;
  padding-left: 0.75rem;
}
.content p { margin-bottom: 0.75rem; }
.content ol { margin: 0.5rem 0 0.75rem 1.5rem; }
.content li { margin-bottom: 0.4rem; }
.content code {
  background: #e2e8f0;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.9em;
}
.content pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* 卡片 */
.cards {
  display: flex;
  gap: 1rem;
  margin: 1rem 0;
  flex-wrap: wrap;
}
.card {
  flex: 1;
  min-width: 200px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.25rem;
}
.card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
  color: #1e293b;
}
.card p { font-size: 0.9rem; color: #64748b; }

/* 按钮 */
.center { text-align: center; }
.btn {
  display: inline-block;
  background: #3b82f6;
  color: #fff;
  padding: 0.6rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.95rem;
  transition: background 0.2s;
}
.btn:hover { background: #2563eb; }

/* 页脚 */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: #94a3b8;
  font-size: 0.85rem;
  border-top: 1px solid #e2e8f0;
  background: #fff;
}

/* 移动端适配 */
@media (max-width: 600px) {
  .nav-container {
    flex-direction: column;
    height: auto;
    padding: 0.5rem 0;
  }
  .nav-menu { gap: 1rem; }
  .hero { padding: 2rem 1rem 1.5rem; }
  .hero h1 { font-size: 1.35rem; }
  .cards { flex-direction: column; }
}