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

html {
  scrollbar-gutter: stable;
}

:root {
  --accent-gradient-line: linear-gradient(90deg, rgba(225, 6, 0, 0) 0%, #E10600 18.27%, #E10600 77.88%, rgba(225, 6, 0, 0) 100%);
}

body {
  font-family: "Microsoft YaHei", sans-serif;
  color: #C8CED6;
  background: #05070B;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; }

.btn {
  display: inline-block;
  text-align: center;
  color: #fff;
  background: linear-gradient(180deg, #F25458 12.02%, #C10014 69.23%);
  opacity: 0.9;
}

/* 顶部导航 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 90px;
  background: linear-gradient(180deg, #05070B 0%, #08111F 100%);
  z-index: 100;
}

.header-inner {
  max-width: 1920px;
  height: 90px;
  margin: 0 auto;
  padding: 0 80px;
  display: flex;
  align-items: center;
}

.header-logo img {
  height: 53px;
}

.nav {
  flex: 1;
  margin-left: 60px;
}

.nav-list {
  display: flex;
  justify-content: center;
  gap: 39px;
}

.nav-item a {
  display: block;
  padding: 0 10px;
  line-height: 90px;
  font-size: 16px;
  color: #fff;
  border-bottom: 2px solid transparent;
}

.nav-item:hover a,
.nav-item.active a {
  color: #E10600;
  border-bottom: 2px solid #E10600;
}

.btn-contact {
  width: 80px;
  height: 30px;
  line-height: 30px;
  border-radius: 50px;
  font-size: 12px;
}

/* 手机端菜单按钮，默认隐藏 */
.nav-btn {
  display: none;
  width: 28px;
  height: 22px;
  cursor: pointer;
}

.nav-btn span {
  display: block;
  height: 2px;
  margin-bottom: 6px;
  background: #fff;
}

.nav-btn span:last-child {
  margin-bottom: 0;
}

/* 手机端联系图标、底部 Tab：默认隐藏 */
.header-contact,
.tabbar {
  display: none;
}