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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: #1a1a2e;
  background: #f5f5f7;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.section {
  width: 100%;
  height: 100vh;
  min-height: 640px;
  position: relative;
  overflow: hidden;
}

.section--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e8e8ed;
  color: #888;
  font-size: 18px;
}