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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #121212;
    color: #e0e0e0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.container {
    background-color: #1e1e1e;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
    text-align: center;
    width: 100%;
    max-width: 600px;
}

h1 {
    color: #ffffff;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.conjugations {
    background-color: #2a2a2a;
    border: 1px solid #444;
    border-radius: 4px;
    padding: 10px;
    margin-top: 10px;
  }
  
  .conjugations h4 {
    color: #4CAF50;
    margin-bottom: 5px;
  }
  
  .conjugations p {
    margin: 5px 0;
  }
  
  .conjugations strong {
    color: #b0b0b0;
  }

  #verb-tense-selector {
    margin-bottom: 1rem;
}

#verb-tense {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #555555;
    border-radius: 4px;
    font-size: 1rem;
    background-color: #2a2a2a;
    color: #e0e0e0;
    cursor: pointer;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#verb-tense:hover {
    border-color: #4CAF50;
}

#verb-tense:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}

#verb-tense option {
    background-color: #2a2a2a;
    color: #e0e0e0;
}

#test-type-selector {
    margin-bottom: 1rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.test-type-btn {
    background-color: #333333;
    border: 1px solid #555555;
    color: #e0e0e0;
    padding: 0.5rem 1rem;
    margin: 0.25rem;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.3s, color 0.3s;
}

.test-type-btn.active {
    background-color: #4CAF50;
    color: #ffffff;
    border-color: #4CAF50;
}


#question-container {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

#romanization-container {
    font-size: 0.8em;
    color: #b0b0b0;
    margin-bottom: 1rem;
}


#user-input {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #555555;
    border-radius: 4px;
    font-size: 1rem;
    background-color: #2a2a2a;
    color: #e0e0e0;
}

#submit-btn, #next-btn {
    background-color: #4CAF50;
    color: #ffffff;
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 4px;
    margin: 0.5rem;
    font-size: 1rem;
    transition: background-color 0.3s;
}

#submit-btn:hover, #next-btn:hover {
    background-color: #45a049;
}


#result-container {
    margin-top: 1rem;
    font-size: 1rem;
}


#score {
    font-weight: bold;
    margin-top: 1rem;
    font-size: 1.2rem;
}

#korean-keyboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(30px, 1fr));
    gap: 5px;
    max-width: 100%;
    margin: 20px auto;
}

#korean-keyboard button {
    padding: 10px;
    border: 1px solid #555555;
    background-color: #2a2a2a;
    color: #e0e0e0;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

#korean-keyboard button:hover {
    background-color: #3a3a3a;
}
#additional-info {
    margin-top: 2rem;
    text-align: left;
    background-color: #2a2a2a;
    padding: 1rem;
    border-radius: 4px;
}

#additional-info h3 {
    color: #4CAF50;
    margin-bottom: 1rem;
}

#additional-info p {
    margin-bottom: 0.5rem;
}

#examples-container, #conjugation-container {
    margin-top: 1rem;
}

#examples-container h4, #conjugation-container h4 {
    color: #4CAF50;
    margin-bottom: 0.5rem;
}

#examples-container > div {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #444;
}

#examples-container > div:last-child {
    border-bottom: none;
}


#user-input, #definition-input {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #555555;
    border-radius: 4px;
    font-size: 1rem;
    background-color: #2a2a2a;
    color: #e0e0e0;
}

#definition-input {
    margin-top: 0.5rem;
}

@media screen and (max-width: 480px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .test-type-btn, #submit-btn, #next-btn {
        font-size: 0.9rem;
        padding: 0.4rem 0.8rem;
    }

    #question-container, #user-input, #result-container {
        font-size: 0.9rem;
    }

    #romanization-container {
        font-size: 0.7em;
    }

    #korean-keyboard {
        grid-template-columns: repeat(auto-fit, minmax(25px, 1fr));
        gap: 3px;
    }

    #korean-keyboard button {
        font-size: 0.8rem;
        padding: 8px;
    }
    #additional-info {
        font-size: 0.9rem;
    }

    #additional-info h3, #examples-container h4, #conjugation-container h4 {
        font-size: 1.1rem;
    }
}