* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: #333;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部样式 */
header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 20px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  display: flex;
  align-items: center;
}

.logo i {
  margin-right: 10px;
}

nav ul {
  display: flex;
  list-style: none;
}

nav ul li {
  margin-left: 30px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.3s;
}

nav ul li a:hover {
  opacity: 0.8;
}

/* 英雄区域 */
.hero {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
  color: #333;
}

.hero p {
  font-size: 22px;
  margin-bottom: 30px;
  color: #666;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.cta-button {
  display: inline-block;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 15px 40px;
  font-size: 20px;
  font-weight: bold;
  text-decoration: none;
  border-radius: 50px;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

/* 特性区域 */
.features {
  padding: 80px 0;
  background: white;
}

.section-title {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: #333;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
}

.feature-card {
  text-align: center;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-10px);
}

.feature-icon {
  font-size: 50px;
  margin-bottom: 20px;
  color: #667eea;
}

.feature-card h3 {
  font-size: 24px;
  margin-bottom: 15px;
  color: #333;
}

/* 使用指南 */
.how-to-use {
  padding: 80px 0;
  background: #f9f9f9;
}

.steps {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
}

.step {
  flex: 1;
  min-width: 150px;
  text-align: center;
  padding: 10px;
}

.step-number {
  display: inline-block;
  width: 50px;
  height: 50px;
  line-height: 50px;
  background: #667eea;
  color: white;
  border-radius: 50%;
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 20px;
}

/* FAQ */
.faq {
  padding: 80px 0;
  background: white;
}

.faq-item {
  margin-bottom: 20px;
  border-bottom: 1px solid #eee;
  padding-bottom: 20px;
}

.faq-question {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 10px;
  color: #333;
}

/* 底部 */
footer {
  background: #333;
  color: white;
  padding: 40px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-section h3 {
  margin-bottom: 20px;
  font-size: 20px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #ccc;
  text-decoration: none;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: white;
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid #555;
  color: #aaa;
  font-size: 14px;
}

/* 弹框样式 */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  animation: fadeIn 0.3s ease;
}

.modal-content {
  background-color: #fff;
  margin: 10% auto;
  padding: 20px;
  border-radius: 10px;
  width: 80%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
  animation: slideIn 0.3s ease;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-header h2 {
  margin: 0;
  color: #333;
  font-size: 24px;
}

.close {
  color: #aaa;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.3s;
}

.close:hover,
.close:focus {
  color: #333;
}

.qr-code {
  max-width: 100%;
  height: auto;
  margin: 20px 0;
  border: 10px solid #f5f5f5;
  border-radius: 10px;
}

.modal-footer {
  margin-top: 20px;
  font-size: 16px;
  color: #666;
}

.modal-footer p {
  margin: 5px 0;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
  }

  nav ul {
    margin-top: 20px;
  }

  nav ul li {
    margin: 0 10px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero p {
    font-size: 18px;
  }

  .section-title {
    font-size: 28px;
  }

  .modal-content {
    width: 90%;
    margin: 20% auto;
  }
}