/* 全局样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; } /* 平滑滚动 */
body {
  font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
  background: #f9fbfd;
  color: #333;
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }

/* 头部导航 */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
  background: #ffffff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}
.logo {
  font-size: 1.8rem;
  font-weight: bold;
  color: #0066cc;
}
.logo span { color: #003366; }
.nav a {
  margin-left: 2rem;
  color: #555;
  font-weight: 500;
}
.nav a:hover { color: #0066cc; }

/* 英雄区域 */
.hero {
  padding: 8rem 5% 6rem;
  text-align: center;
  background: linear-gradient(135deg, #e6f4ff 0%, #ffffff 100%);
  margin-top: 72px;
}
.hero h1 {
  font-size: 2.8rem;
  color: #003366;
  margin-bottom: 1rem;
}
.hero p {
  font-size: 1.2rem;
  color: #555;
  max-width: 800px;
  margin: 0 auto 2rem;
}
.btn {
  display: inline-block;
  padding: 0.9rem 2.2rem;
  background: #0066cc;
  color: white;
  border-radius: 30px;
  font-weight: bold;
  font-size: 1rem;
  margin: 0.5rem;
  transition: all 0.3s;
}
.btn:hover { background: #0055aa; transform: translateY(-2px); }
.btn-outline {
  background: transparent;
  border: 2px solid #0066cc;
  color: #0066cc;
}
.btn-outline:hover { background: #f0f8ff; }

/* 功能亮点 */
.features {
  padding: 5rem 5%;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  background: #f0f8ff;
}
.feature-card {
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  width: 260px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s;
}
.feature-card:hover { transform: translateY(-5px); }
.feature-icon {
  font-size: 2.5rem;
  color: #0066cc;
  margin-bottom: 1rem;
}
.feature-card h3 { font-size: 1.3rem; margin-bottom: 0.8rem; color: #003366; }
.feature-card p { font-size: 0.95rem; color: #666; }

/* 下载区域 */
.download {
  padding: 5rem 5%;
  text-align: center;
  background: #f0f8ff;
}
.download h2 { font-size: 2.2rem; margin-bottom: 2rem; color: #003366; }
.download-btn {
  display: inline-block;
  padding: 1rem 2rem;
  background: #0066cc;
  color: white;
  border-radius: 30px;
  font-weight: bold;
  margin: 1rem;
  text-decoration: none;
}
.download-btn:hover { background: #0055aa; }

/* 关于区域 */
.about {
  padding: 5rem 5%;
  background: #ffffff;
  text-align: center;
}
.about h2 { font-size: 2.2rem; margin-bottom: 2rem; color: #003366; }
.about p { font-size: 1.1rem; color: #555; max-width: 800px; margin: 0 auto; }

/* 数据统计 */
.stats {
  padding: 4rem 5%;
  text-align: center;
  background: #f0f8ff;
  color: #003366;
}
.stats h2 { font-size: 2.2rem; margin-bottom: 1.5rem; }
.stat-numbers {
  display: flex;
  justify-content: center;
  gap: 4rem;
  font-size: 1.4rem;
  font-weight: bold;
}
.stat { line-height: 1.4; }
.num { font-size: 2.4rem; color: #0066cc; }

/* 底部 */
.footer {
  padding: 3rem 5%;
  text-align: center;
  background: #001a33;
  color: #ccc;
  font-size: 0.95rem;
}
.footer a { color: #6cbcff; margin: 0 0.8rem; }
.footer a:hover { text-decoration: underline; }
.copyright { margin-top: 1.5rem; color: #999; }

/* 工具栏功能模块 */
.freedom-modules {
  padding: 3rem 5%;
  text-align: center;
  background: #ffffff;
}
.freedom-modules h2 {
  font-size: 2.2rem;
  margin-bottom: 1.5rem;
  color: #003366;
}
.freedom-modules p {
  font-size: 1.1rem;
  color: #555;
  max-width: 800px;
  margin: 0 auto;
}