/* ベース（スマホ） */
body, html {
  margin: 0;
  padding: 0;
  height: 667px;
  width: 375px;
  position: relative;
  overflow: hidden;
}
.container {
  position: relative;
  width: 100%;
  height: 90%;
}
.background {
  position: absolute;
  width: 120%;
  height: 80%;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}
.truck {
  position: absolute;
  z-index: 2;
  max-height: 15%;
  max-width: 36%;
  right: -30px;
  top: 55%;
  transform: translateY(-50%);
}
.tatsuro {
  position: absolute;
  z-index: 2;
  max-height: 15%;
  max-width: 10%;
  left: calc(25px);
  bottom: 125px;
}
.action-btn, .reset-btn {
  position: absolute;
  z-index: 3;
  font-size: 16px;
  padding: 10px;
  cursor: pointer;
  bottom: 50px;
  touch-action: manipulation;
}
.action-btn {
  left: 80px;
}
.reset-btn {
  left: 220px;
}
.message {
  position: absolute;
  z-index: 3;
  font-size: 0.7rem;
  left: 50%;
  top: 30%;
  transform: translateX(-50%);
  display: none;
  background-color: white;
  padding: 5px;
  border-radius: 4px;
  box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.25);
}
.rule-message {
  position: absolute;
  top: 20px;
  left: 10px;
  right: 10px;
  font-size: 0.9rem;
  font-weight: bold;
  color: #333;
  text-align: center;
  text-shadow: 1px 1px #eee;
  white-space: normal;
}
.rule-message span {
  display: block;
  font-size: 0.8rem;
  font-weight: normal;
  margin-top: 5px;
}
.success { color: green; }
.failure { color: red; }
.no-guts { color: black; }

/* PC（768px以上） */
@media (min-width: 768px) {
  body, html {
    width: 100%;
    height: 100vh;
  }
  .container {
    width: 750px;
    height: 600px;
    margin: 40px auto;
    border: 2px solid #ccc;
    border-radius: 12px;
    overflow: hidden;
    background: #fff;
  }
  .background {
    width: 110%;
    height: 75%;
    top: 48%;
  }
  .truck {
    max-height: 18%;
    max-width: 30%;
    top: 52%;
  }
  .tatsuro {
    max-height: 18%;
    max-width: 8%;
    bottom: 150px;
  }
  .action-btn, .reset-btn {
    font-size: 1.2rem;
    padding: 12px 20px;
    bottom: 40px;
  }
  .action-btn {
    left: 200px;
  }
  .reset-btn {
    left: 420px;
  }
  .rule-message {
    font-size: 1.4rem;
    top: 24px;
  }
  .message {
    font-size: 1rem;
  }
}