* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Arial", sans-serif;
}

html,
body {
  overflow: hidden;
  height: 100%;
}
/* 仅手机 */
.only-phone {
  display: none;
}
/* 仅pc */
.only-pc {
  display: block;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: #2c3e50;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

.nav-logo {
  color: white;
  font-weight: bold;
  font-size: 1.2rem;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  transition: all 0.3s ease;
}

.nav-item {
  margin: 0 10px;
}

.nav-link {
  color: #ecf0f1;
  text-decoration: none;
  padding: 15px 10px;
  display: block;
  transition: color 0.3s;
  font-size: 0.9rem;
}

.nav-link:hover,
.nav-link.active {
  color: #3498db;
}

/* 汉堡菜单 */
.menu-toggle {
  display: none;
  cursor: pointer;
  padding: 10px;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: white;
  margin: 5px 0;
  transition: all 0.3s ease;
}

/* 最外部模块样式 */
.section-container {
  height: 100vh;
  width: 100%;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
  padding-top: 60px;
  /* 隐藏滚动条 */
  scrollbar-width: none;
  /* Firefox */
  -ms-overflow-style: none;
  /* IE 和 Edge */
}
/* 隐藏Webkit浏览器滚动条 */
.section-container::-webkit-scrollbar {
  display: none;
}

/* 各个模块的div */
.section {
  height: 100vh;
  scroll-snap-align: start;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.section:nth-child(odd) {
  background-color: #f9f9f9;
}

.section:nth-child(even) {
  background-color: #e9e9e9;
}

/* 背景图的操作 */
/* 模块一1背景 */
#section1 {
  background-image: url(../images/website/banner1.png);
  background-size: cover;
  background-position: center;
}
/* 模块5背景 */
#section5 {
  background-image: url(../images/website/行业案例@2x.png);
  background-size: cover;
  background-position: center;
}

/* 模块二的内容 */
.grid-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  /* 默认 4 列 */
  grid-auto-rows: minmax(100px, auto);
  /* 行高自适应，最小 100px */
  gap: 10px;
  /* 间距 */
  padding: 10px;
  width: 100%;
}

.grid-item {
  aspect-ratio: 3/2;
  /* 宽高比（接近 300x200） */
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
  position: relative;
  width: 100%;
}

.grid-item h2,
.grid-item p {
  transition: opacity 0.3s ease;
  position: relative;
  z-index: 1;
}