* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background: #f8fafc;
  color: #1e293b;
  line-height: 1.7;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: #0f172a;
  padding: 20px 0;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  justify-items: center;
  flex-direction: row;
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 1px;
  text-shadow: 0 0 10px #1c1c1c;
}

.nav-menu a {
  color: #e2e8f0;
  margin-left: 32px;
  text-decoration: none;
  font-size: 16px;
  transition: color 0.3s;
}

.nav-menu a:hover {
  color: #38bdf8;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  background: #0284c7;
  color: #fff;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.3s;
}

.btn:hover {
  background: #0369a1;
  transform: translateY(-2px);
}

/* 卡片 + 悬浮动画 */
.card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  padding: 40px;
  margin-bottom: 32px;
  transition: all 0.3s ease;
}

/* 鼠标悬浮动画：轻微上浮+阴影加深 */
.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.1);
}

/* 图片样式 */
.img-responsive {
  width: 100%;
  border-radius: 12px;
  object-fit: cover;
}

/* 图标样式 */
.icon {
  font-size: 32px;
  color: #0284c7;
  margin-bottom: 20px;
}

/* 标题 */
.section-title {
  font-size: 38px;
  font-weight: 700;
  color: #0f172a;
  text-align: center;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 18px;
  color: #64748b;
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px auto;
  line-height: 1.8;
}

section {
  padding: 100px 0;
}

/* 响应式适配（手机端） */
@media (max-width: 768px) {
  .section-title {
    font-size: 30px;
  }

  .card {
    padding: 30px;
  }
}

/* 图标 */
.logo-img {
  width: 28px;
  height: 28px;
  margin: 7px;
  border-radius: 5px;
  background-color: #eee;
  box-shadow: 0 0 3px #38bdf8;
}

/* 二维码 */
.ewm {
  height: 150px;
}

/* 全局滚动条美化 */
::-webkit-scrollbar {
  width: 3px;
  height: 3px;
}

/* 滚动条轨道 */
::-webkit-scrollbar-track {
  /* background: #313334; */
  background: rgba(128, 90, 90, 0.5);
  border-radius: 10px;
}

/* 滚动条滑块 */
::-webkit-scrollbar-thumb {
  background: rgba(29, 51, 148, 0.25);
  /* background: linear-gradient(135deg, #02274a 0%, #010c17 100%); */
  border-radius: 10px;
  transition: all 0.3s ease;
}

/* 鼠标悬停滑块 */
::-webkit-scrollbar-thumb:hover {
  background: #0b3d76;
  transform: scale(1.2);
}

/* 给卡片内容区域单独加更精致的滚动条 */
.card::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}