/* RESET */
*,
*::before,
*::after{
  box-sizing:border-box;
}

html,
body{
  margin:0;
  overflow-x:hidden;
}

/* BODY */
body{
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;

  background:
    radial-gradient(circle at top,
    #25345c 0%,
    #0b1020 45%,
    #050711 100%);

  color:white;

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

/* =========================
   ■ タイトル
========================= */
h1 {
  text-align: center;
  margin-bottom: 6px;
  position: relative;
  z-index: 10;
  
}

.h1-sub {
  text-align: center;
  margin-bottom: 1px;
  position: relative;
  z-index: 10;
}

.hidden {
  display: none;
}