* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  overflow: hidden;
  color: #fff;
  font-family:
    "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  content: "";
  background:
    linear-gradient(rgba(0, 0, 0, 0.42), rgba(0, 0, 0, 0.48)),
    url("./assets/classroom.jpg") center / cover no-repeat;
  transform: scale(1.02);
}

body::after {
  position: fixed;
  inset: 0;
  content: "";
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.14), transparent 30%),
    linear-gradient(135deg, rgba(0, 0, 0, 0.28), rgba(0, 0, 0, 0.04));
  pointer-events: none;
}

.stage {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 28px;
}

h1 {
  margin: 0;
  max-width: 11ch;
  color: #fff;
  font-size: clamp(4.5rem, 16vw, 13rem);
  font-weight: 950;
  letter-spacing: 0;
  line-height: 1.02;
  text-align: center;
  text-shadow:
    0 4px 0 rgba(0, 0, 0, 0.45),
    0 18px 42px rgba(0, 0, 0, 0.78),
    0 0 34px rgba(255, 255, 255, 0.34);
}