/* 基础样式 */
:root {
  --primary-color: #4a6bff;
  --secondary-color: #ff6b6b;
  --dark-color: #333;
  --light-color: #f4f7ff;
  --text-color: #444;
  --border-radius: 8px;
  --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: #fff;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: var(--transition);
}

a:hover {
  color: var(--secondary-color);
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

h2 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 2rem;
}

p {
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 12px 30px;
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: var(--transition);
  text-align: center;
}

.btn:hover {
  background-color: var(--secondary-color);
  color: white;
  transform: translateY(-3px);
  box-shadow: var(--box-shadow);
}

section {
  padding: 80px 0;
}

/* 导航栏 */
header {
  background-color: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 15px;
}

.logo h1 {
  font-size: 1.8rem;
  margin: 0;
  color: var(--primary-color);
}

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

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

nav ul li a {
  color: var(--dark-color);
  font-weight: 500;
}

nav ul li a:hover {
  color: var(--primary-color);
}

/* 英雄区域 */
.hero {
  background: linear-gradient(135deg, #f5f7ff 0%, #e3eaff 100%);
  padding: 100px 0;
}

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

.hero-content {
  flex: 1;
  padding-right: 50px;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  color: var(--dark-color);
}

.hero-content p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  color: var(--text-color);
}

.hero-image {
  flex: 1;
  text-align: center;
}

.hero-image img {
  max-width: 100%;
  border-radius: 20px;
  box-shadow: var(--box-shadow);
}

/* 功能区域 */
.features {
  background-color: white;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.feature-card {
  background-color: var(--light-color);
  border-radius: var(--border-radius);
  padding: 30px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--box-shadow);
}

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

.feature-icon {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

/* 使用步骤 */
.how-it-works {
  background-color: var(--light-color);
}

.steps {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 30px;
}

.step {
  flex: 1;
  min-width: 250px;
  background-color: white;
  border-radius: var(--border-radius);
  padding: 30px;
  text-align: center;
  box-shadow: var(--box-shadow);
  position: relative;
}

.step-number {
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  margin: 0 auto 20px;
}

/* 下载区域 */
.download {
  text-align: center;
  background: linear-gradient(135deg, #e3eaff 0%, #f5f7ff 100%);
}

.download p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto 30px;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.app-store-btn img {
  height: 60px;
  transition: var(--transition);
}

.app-store-btn:hover img {
  transform: scale(1.05);
}

/* 技术支持 */
.support {
  text-align: center;
}

.support p {
  max-width: 600px;
  margin: 0 auto 40px;
}

.contact-info {
  display: flex;
  justify-content: center;
  gap: 50px;
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-item i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.contact-item p {
  margin-bottom: 0;
}

/* 页脚 */
footer {
  background-color: var(--dark-color);
  color: white;
  padding: 40px 0;
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
}

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

/* 响应式设计 */
@media (max-width: 992px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-content {
    padding-right: 0;
    margin-bottom: 50px;
  }

  .hero-content h1 {
    font-size: 2.8rem;
  }

  .steps {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  header .container {
    flex-direction: column;
  }

  nav ul {
    margin-top: 20px;
  }

  nav ul li {
    margin: 0 15px;
  }

  h2 {
    font-size: 2rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  footer .container {
    flex-direction: column;
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2.2rem;
  }

  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  nav ul li {
    margin: 5px 10px;
  }

  .contact-info {
    flex-direction: column;
    gap: 30px;
  }
}

/* 隐私政策页面样式 */
.privacy-policy {
  padding: 80px 0;
  background-color: #f9f9f9;
}

.privacy-policy h1 {
  margin-bottom: 10px;
  color: #333;
  font-size: 2.5rem;
}

.last-updated {
  color: #777;
  margin-bottom: 15px;
  font-style: italic;
}

.language-selector {
  margin-bottom: 30px;
  font-size: 1rem;
  color: #555;
}

.language-selector .active {
  color: var(--primary-color);
  font-weight: 600;
}

.policy-content {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
  padding: 30px;
}

.policy-section {
  margin-bottom: 30px;
}

.policy-section:last-child {
  margin-bottom: 0;
}

.policy-section h2 {
  color: #333;
  margin-bottom: 15px;
  font-size: 1.5rem;
  border-bottom: 1px solid #eee;
  padding-bottom: 8px;
}

.policy-section p {
  margin-bottom: 15px;
  line-height: 1.6;
}

.policy-section ul {
  margin-left: 20px;
  margin-bottom: 15px;
}

.policy-section li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.logo h1 a {
  color: inherit;
  text-decoration: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .privacy-policy {
    padding: 40px 0;
  }
  
  .policy-content {
    padding: 20px;
  }
  
  .privacy-policy h1 {
    font-size: 2rem;
  }
  
  .policy-section h2 {
    font-size: 1.3rem;
  }
}