@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+JP&family=Roboto&display=swap");

:root {
  --primary-color: #79C8BC;
  --secondary-color: #444565;
  --background-color: #FFFFFF;
  --text-color: #444565;
  --button-text-color: #FFFFFF;
  --error-color: #DD68AA;
  --button-color: #444565;
  --button-hover-color: #BB5599;
  --input-border-color: #DD68AA;
}

#backgroundVideo {
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
    z-index: -1;
    width: 100%;
    object-fit: cover;
    /* object-fit: contain; */
    /* overflow-clip-margin: content-box; */
    overflow: clip;
  }

@keyframes move-and-rotate {
    0% {
      transform: translate(0, 0) rotate(0deg);
    }
    100% {
      transform: translate(-100vw, -100vh) rotate(1turn);
    }
  }
  
  .triangle {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid var(--primary-color);
    position: absolute;
    animation: move-and-rotate 5s linear infinite;
  }

  #pageTitle-container {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  #pageTitle-container img {
    height: 2em;
    vertical-align: middle;
    margin-right: 2px;
  }

body {
  font-family: "Noto Sans JP", sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  transition: background-color 0.5s ease;
  font-size: 16px;
  padding: 20px;
  position: relative;
}

#toggleLanguageText {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    font-size: 0.5vw;
    max-width: 22vw;
    color: var(--button-text-color);
}

h1 {
  text-align: center;
  color: var(--primary-color);
}

input[type="number"],
button {
  width: 100%;
  padding: 10px;
  font-size: 30px;
  margin-bottom: 10px;
  background-color: var(--button-color);
  color: var(--background-color);
  border: none;
  transition: background-color 0.3s ease;
  border-radius: 20px; /* Add rounded corners */
}

input[type="number"]:focus,
button:hover {
  background-color: var(--button-hover-color);
}

input[type="number"] {
  border: 1px solid var(--input-border-color);
}

.centered-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 20vw;
}

#result {
  margin-top: 20px;
  padding: 10px;
  border: 1px solid var(--secondary-color);
  border-radius: 5px;
  background-color: var(--background-color);
  color: var(--text-color);
}

.error {
  color: var(--error-color);
  font-weight: bold;
}

.case {
  border: 1px solid var(--secondary-color);
  margin-bottom: 10px;
  padding: 10px;
  background-color: var(--background-color);
  color: var(--text-color);
}

.case h2 {
  margin-top: 0;
  color: var(--text-color);
}

@media (min-width: 600px) {
  body {
    font-size: 18px;
    padding: 40px;
  }

  input[type="number"],
  button {
    width: auto;
    font-size: 18px;
  }
}

@media (min-width: 900px) {
  body {
    font-size: 20px;
    padding: 60px;
  }

  input[type="number"],
  button {
    font-size: 20px;
  }
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: var(--secondary-color);
    color: var(--background-color);
  }

  #backgroundVideo {
    filter: brightness(50%);
  }

  .case {
    border-color: var(--primary-color);
  }
}