body {
  background: linear-gradient(135deg, #e6f6fc 0%, #f7fbff 100%);
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
  letter-spacing: 0.5px;
}
a {
text-decoration: none !important;
color: rgb(0 153 200) !important;
}

.lang-switch {
  margin-top: 24px;
  margin-bottom: 24px;
  text-align: center;
}

.lang-switch .btn {
  min-width: 110px;
  font-weight: 600;
  border-radius: 30px;
  box-shadow: 0 2px 12px rgba(0,153,200,0.10);
  transition: all 0.2s;
  font-size: 1.1rem;
  padding: 8px 0;
}

.lang-switch .btn-dark {
  background: linear-gradient(90deg, #0099c8 60%, #00c6d7 100%);
  border: none;
  color: #fff;
}

.lang-switch .btn-outline-dark {
  border: 2px solid #0099c8;
  color: #0099c8;
  background: #fff;
}

.main-card {
  background: rgba(255,255,255,0.7);
  border-radius: 24px;
  padding: 48px;
  margin-bottom: 36px;
  box-shadow: 0 8px 40px 0 rgba(0,153,200,0.13), 0 1.5px 8px 0 rgba(0,153,200,0.08);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(8px);
  border: 1.5px solid rgba(0,153,200,0.10);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.main-content {
  flex: 1;
}

.main-logo {
  width: 300px;
  height: 300px;
  flex-shrink: 0;
}

.main-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.main-card .bi-info-circle {
  right: 10px;
  bottom: 10px;
  color: #00b6d7;
  font-size: 1.7rem;
  opacity: 0.7;
  transition: color 0.2s;
}

.main-card .bi-info-circle:hover {
  color: #0099c8;
  opacity: 1;
}

.main-card .main-title {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.6;
  color: #222;
  text-shadow: 0 2px 8px #e6f6fc;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.main-card .title-line {
  display: block;
}

.main-card .main-subtitle {
  color: #0099c8;
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 10px;
  text-shadow: 0 2px 8px #e6f6fc;
  line-height: 1.5;
  letter-spacing: 0.5px;
}

.section-title {
  background: linear-gradient(90deg, #0099c8 60%, #00c6d7 100%);
  color: #fff;
  font-size: 1.35rem;
  text-align: center;
  padding: 15px 0 13px 0;
  border-radius: 12px;
  margin-bottom: 30px;
  letter-spacing: 2px;
  font-weight: 700;
  box-shadow: 0 2px 12px rgba(0,153,200,0.10);
  border: none;
}

.section-subtitle {
  color: #0099c8;
  font-size: 1.35rem;
  text-align: center;
  margin: 44px 0 22px 0;
  letter-spacing: 2px;
  font-weight: 600;
  position: relative;
}

.section-subtitle:after {
  content: "";
  display: block;
  width: 70px;
  height: 4px;
  background: linear-gradient(90deg, #0099c8 60%, #00c6d7 100%);
  margin: 12px auto 0 auto;
  border-radius: 2px;
  opacity: 0.22;
}

.divider {
  border-top: 2.5px solid;
  border-image: linear-gradient(90deg, #b2e9f7 0%, #e6f6fc 100%) 1;
  margin: 38px 0 28px 0;
}

.info-card {
  background: rgba(255,255,255,0.92);
  border-radius: 18px;
  padding: 28px 18px 28px 18px;
  min-height: 150px;
  box-shadow: 0 2px 24px rgba(0,153,200,0.10);
  margin-bottom: 18px;
  position: relative;
  transition: box-shadow 0.25s, transform 0.22s, border 0.22s;
  overflow: hidden;
  border: 2px solid transparent;
}

.info-card:hover {
  box-shadow: 0 8px 40px 0 rgba(0,153,200,0.18), 0 1.5px 8px 0 rgba(0,153,200,0.10);
  transform: translateY(-6px) scale(1.025);
  border: 2px solid #00c6d7;
  z-index: 2;
}

.info-card .icon-bg {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, #e6f6fc 0%, #b2e9f7 100%);
  margin-bottom: 14px;
  box-shadow: 0 4px 18px rgba(0,153,200,0.13);
  border: 2.5px solid #00c6d7;
  transition: box-shadow 0.2s;
}

.info-card:hover .icon-bg {
  box-shadow: 0 8px 32px #00c6d733;
  border-color: #0099c8;
}

.info-card .bi, .info-card img {
  font-size: 2.2rem;
  color: #00b6d7;
  margin-bottom: 0;
  filter: drop-shadow(0 2px 8px #b2e9f7);
}

.info-card .info-title {
  font-weight: 700;
  font-size: 1.13rem;
  margin-bottom: 6px;
  color: #222;
  letter-spacing: 1px;
}

.info-card .info-desc {
  font-size: 1.01rem;
  color: #4a4a4a;
  line-height: 1.7;
  font-weight: 500;
}

.info-card .download {
  position: absolute;
  right: 18px;
  bottom: 18px;
  color: #00b6d7;
  font-size: 1.7rem;
  cursor: pointer;
  background: #e6f6fc;
  border-radius: 50%;
  padding: 8px 10px 6px 10px;
  box-shadow: 0 2px 8px #b2e9f7;
  transition: color 0.2s, background 0.2s, transform 0.2s;
}

.info-card .download:hover {
  color: #fff;
  background: linear-gradient(90deg, #0099c8 60%, #00c6d7 100%);
  transform: scale(1.22);
}

.about-card {
  background: rgba(255,255,255,0.92);
  border-radius: 18px;
  padding: 24px 15px;
  height: 100%;
  box-shadow: 0 2px 24px rgba(0,153,200,0.10);
  transition: box-shadow 0.25s, transform 0.22s, border 0.22s;
  border: 2px solid transparent;
  text-align: center;
}

.about-card:hover {
  box-shadow: 0 8px 40px 0 rgba(0,153,200,0.18), 0 1.5px 8px 0 rgba(0,153,200,0.10);
  transform: translateY(-6px) scale(1.025);
  border: 2px solid #00c6d7;
}

.about-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 15px;
}

.about-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.about-title {
  font-weight: 700;
  font-size: 1.13rem;
  color: #222;
  letter-spacing: 1px;
}

.footer-nav {
  margin: 0 auto 32px auto;
  max-width: 700px;
}

.footer-nav .card {
  border: none;
  border-radius: 18px;
  box-shadow: 0 2px 16px rgba(0,153,200,0.08);
  transition: box-shadow 0.2s, transform 0.2s, background 0.2s;
  background: #fff;
  cursor: pointer;
  min-height: 70px;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  padding: 0 18px;
  margin-bottom: 0;
}

.footer-nav .card:hover {
  box-shadow: 0 8px 32px #00c6d733;
  background: linear-gradient(90deg, #e6f6fc 60%, #b2e9f7 100%);
  transform: translateY(-4px) scale(1.04);
}

.footer-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #e6f6fc 0%, #b2e9f7 100%);
  border-radius: 50%;
  box-shadow: 0 2px 12px rgba(0,153,200,0.10);
  border: 2px solid #00c6d7;
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-icon i {
  font-size: 1.7rem;
  color: #00b6d7;
}

.footer-nav .nav-title {
  font-size: 1.08rem;
  color: #0099c8;
  font-weight: 600;
  margin-top: 0;
  letter-spacing: 1px;
  text-align: left;
}

.info-card .col-4 img {
  width: 100px;
  height: 100px;
}

@media (max-width: 768px) {
  .lang-switch .btn {
    min-width: 90px;
   
  }
  .main-card {
    flex-direction: column;
    padding: 24px;
    gap: 20px;
  }
  
  .main-logo {
    width: 200px;
    height: 200px;
    order: -1;
  }
  
  .footer-nav .card {
    min-height: 60px;
    padding: 0 10px;
  }
  
  .footer-icon {
    width: 38px;
    height: 38px;
  }
  
  .footer-nav .nav-title {
    font-size: 1rem;
  }
  
  .about-card {
    padding: 18px 10px;
  }
  
  .about-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 10px;
  }
  
  .about-title {
    font-size: 1rem;
  }
  
  .main-card .main-title {
    font-size: 1.4rem;
    line-height: 1.4;
    margin-bottom: 15px;
  }
  
  .main-card .title-line {
    display: block;
    margin-bottom: 5px;
  }
  
  .main-card .title-line:first-child:after {
    content: none;
  }
  
  .main-card .main-subtitle {
    font-size: 1.3rem;
  }

  .section-title {
    font-size: 1.1rem;
    padding: 12px 0 10px 0;
  }
}