@font-face {
  font-family: "Geist Sans";
  src: url("/fonts/GeistSans.woff2") format("woff2");
}

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

@keyframes background-animation {
  0% {
    background-position: 0 0;
  }

  100% {
    background-position: 20vh 20vh;
  }
}

body {
  color: #000;
  background-color: #fff;
  background-image: url("/img/yui.png");
  background-size: 20vh 20vh;
  background-attachment: fixed;
  font-family: "Geist Sans", serif;
  font-size: 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: background-animation 1s linear infinite;
}

body.messages {
  background-image: none;
}

main {
  width: 100%;
  max-width: 40rem;
  display: flex;
  flex-direction: column;
  gap: 3rem;
  padding: 1rem;
}

.flex.row {
  display: flex;
  flex-direction: row;
}

.flex.column {
  display: flex;
  flex-direction: column;
}

section {
  flex: 1;
}

a {
  position: relative;
  color: #000;
  text-decoration-color: #00000080;
  text-decoration-thickness: 2px;
  transition: 250ms ease;
}

a:hover {
  text-decoration-color: #000;
}

hr {
  border: none;
  background: #000;
  width: 100%;
  height: 2px;
}

input,
textarea {
  padding: 4px;
}

span.hidden {
  display: none;
}