:root {
  --primary-color: #0077cc;
  --secondary-color: #4a90e2;
  --accent-color: #f5a623;
  --warning-color: #e74c3c;
  --text-color: #333333;
  --light-text: #ffffff;
  --background-color: #f8f9fa;
  --border-radius: 4px;
  --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.header {
  display: flex;
  align-items: center;
  padding: 1rem 0;
}

.brand {
  display: flex;
  align-items: center;
}

.brand-logo {
  height: 40px;
  margin-right: 10px;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

.nav {
  display: flex;
  margin-left: auto;
}

.nav-link {
  margin-left: 1.5rem;
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
}

.nav-link:hover {
  color: var(--primary-color);
}

.hero {
  padding: 3rem 0;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.hero-subtitle {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  color: #666;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: #005fa3;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background-color: #3a7bc8;
}

.warning-box {
  background-color: #fff8e6;
  border: 2px solid var(--warning-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  margin: 1.5rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  max-width: 900px;
}

.warning-icon {
  color: var(--warning-color);
  font-size: 1.5rem;
  margin-right: 0.8rem;
  flex-shrink: 0;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  padding: 3rem 0;
}

.feature-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--box-shadow);
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.feature-title {
  font-size: 1.2rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.feature-desc {
  color: #666;
}

.download-section {
  text-align: center;
  padding: 3rem 0;
  background-color: #f0f7ff;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.footer {
  background-color: #333;
  color: white;
  padding: 2rem 0;
  text-align: center;
}

.official-badge {
  background-color: var(--warning-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  margin: 1rem 0;
}

.official-badge i {
  margin-right: 0.5rem;
}

@media (max-width: 768px) {
  .features {
    grid-template-columns: 1fr;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .nav {
    display: none;
  }
}