@charset "UTF-8";

.box-base {
  height: 100px;
  margin-bottom: 30px;
  padding: 20px;
  color: white;
  font-weight: bold;
}

.box-fixed {
  width: 500px;
  background-color: #e74c3c; 
}

.box-fluid {
  width: 100%;
  background-color: #3498db; 
}

.box-ideal {
  width: 100%;
  max-width: 500px;
  background-color: #2ecc71; 
}

.responsive-test {
    background-color: #ffeb3b; 
    padding: 50px;
    text-align: center;
}

.mode-text {
    font-size: 1.2em;
    font-weight: bold;
}

.mode-text::after {
    content: "スマホ版 (767px以下)";
}

@media (min-width: 768px) {
    .responsive-test {
        background-color: #ff9800; 
    }
    
    .mode-text::after {
        content: "タブレット版 (768px以上)";
    }
}

@media (min-width: 1024px) {
    .responsive-test {
        background-color: #00bcd4; 
    }
    
    .mode-text::after {
        content: "PC版 (1024px以上)";
    }
}