* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9f9;
}
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* 导航栏 */
.navbar {
  background: white;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}
.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
}
.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #2c3e50;
}
nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: #555;
  transition: color 0.3s;
}
nav a:hover {
  color: #3498db;
}

/* 英雄区域 */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), 
              url('https://images.unsplash.com/photo-1581092580497-e0d23cbdf3f8?auto=format&fit=crop&w=1920&q=80') 
              center/cover no-repeat;
  color: white;
  text-align: center;
}
.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}
.hero p {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 2rem;
}
.btn {
  display: inline-block;
  background: #3498db;
  color: white;
  padding: 0.8rem 2rem;
  border-radius: 30px;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
}
.btn:hover {
  background: #2980b9;
}

/* 内容区 */
.solutions, .about {
  padding: 5rem 0;
}
.solutions h2, .about h2 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2rem;
}
.solution-card {
  background: white;
  padding: 2rem;
  margin-bottom: 2rem;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.solution-card h3 {
  color: #2c3e50;
  margin-bottom: 1rem;
}

/* 页脚 */
footer {
  background: #2c3e50;
  color: white;
  text-align: center;
  padding: 2rem 0;
}

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  nav { display: none; }
}