:root {
  --c-primary: #008543;
  --c-primary-dark: #0f823b;
  --c-text: #5e5b5c;
  --c-text-soft: #838788;
  --c-white: #ffffff;
  --c-line: #dddddd;
  --c-border-soft: #b3e2ce;
  --r-sheet: 40px;
  --r-tab: 20px;
  --r-card: 10px;
  --r-slide: 20px;
  --w-mobile: 480px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  color: var(--c-text);
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  width: 100%;
  height: 100vh;
  font-family: var(--font-sans);
  color: var(--c-text);
  background: var(--c-white);
}

figure {
  margin: 0;
}

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

/* 时间轴竖条需保持原图比例，不能被 max-width 压缩 */
.fact-item__rail img,
.timeline-grid__spine img {
  max-width: none;
}

ul {
  list-style: none;
}

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

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