nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  z-index: 1000;
}

nav.white {
  background-color: #fff;
  box-shadow: 0 3px 10px #00000020;
}

nav .center-area {
  height: 100%;
}

.nav-title {
  flex: auto;
  margin-left: 26px;
  color: #fff;
  font-size: 16px;
}

nav.white .nav-title {
  color: #666;
}

.nav-logo {
  width: 130px;
  height: 42px;
  background-image: ;
  background-size: cover;
}

nav.white .nav-logo {
  background-image: ;
}

.nav-tel {
  padding-left: 28px;
  height: 18px;
  line-height: 18px;
  font-size: 16px;
  color: #fff;
  background-image: ;
  background-size: 18px 18px;
  background-position: 0 0;
  background-repeat: no-repeat;
  margin-right: 24px;
}

nav.white .nav-tel {
  color: #666;
  background-image: ;
}

.nav-btn-contact {
  width: 158px;
  height: 48px;
  border: 1px solid #fff;
  border-radius: 6px;
  text-align: center;
  line-height: 48px;
  font-size: 18px;
  color: #fff;
}

.nav-btn-contact:hover {
  background-color: #00000020;
}

nav.white .nav-btn-contact {
  border: 1px solid #ff6727;
  background-color: #ff6727;
}

nav.white .nav-btn-contact:hover {
  border: 1px solid #fc5d19;
  background-color: #fc5d19;
}

.nav-qq {
  padding-left: 25px;
  height: 18px;
  line-height: 18px;
  font-size: 16px;
  color: #fff;
  background-image: ;
  background-size: 15px 18px;
  background-position: 0 0;
  background-repeat: no-repeat;
  margin-right: 40px;
}

nav.white .nav-qq {
  color: #666;
  background-image: ;
}