.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}

h1 {
    color: #FF6B6B;
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.btn, .btn2, .getmark {
    font-size: 1.5rem;
    padding: 15px 30px;
    margin: 10px;
    border: none;
    border-radius: 25px;
    background: linear-gradient(to bottom, #4FACFE, #00F2FE);
    color: white;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover, .btn2:hover, .getmark:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    background: linear-gradient(to bottom, #FFD93D, #FF6B6B);
}

.operator-buttons button {
    width: 60px;
    height: 60px;
    font-size: 2rem;
    border-radius: 50%;
    margin: 10px;
}

input {
    font-size: 1.8rem;
    padding: 15px;
    border-radius: 15px;
    border: 3px solid #4FACFE;
    background-color: white;
    max-width: 200px;
    text-align: center;
    margin: 10px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
}

.ppp {
    font-size: 2rem;
    color: #FF6B6B;
    margin: 10px;
    font-weight: bold;
}

.calculation-section {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: nowrap;
    gap: 10px;
    background-color: #F8F9FA;
    padding: 20px;
    border-radius: 25px;
    margin: 20px auto;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    max-width: 800px;
}

.calculation-section > * {
    margin: 0 5px;
}

.calculation-section input {
    max-width: 150px;
    min-width: 100px;
}

#iscorrect {
    font-size: 3rem;
    margin: 10px;
}

#countTopic, #mark {
    font-size: 3rem;
    color: #4FACFE;
    margin: 10px;
}

#select {
    font-size: 1.2rem;
    padding: 10px;
    border-radius: 15px;
    background-color: #F8F9FA;
    border: 2px solid #4FACFE;
    margin: 10px;
}

#voiceIO {
    transform: scale(1.5);
    margin: 0 10px;
}

@media screen and (max-width: 768px) {
    .btn, .btn2, .getmark {
        font-size: 1.2rem;
        padding: 12px 24px;
    }

    .ppp {
        font-size: 1.5rem;
    }

    input {
        font-size: 1.5rem;
        max-width: 150px;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 10px;
    }

    h1 {
        font-size: 2rem;
    }

    .btn, .btn2, .getmark {
        font-size: 1rem;
        padding: 10px 20px;
    }

    .operator-buttons button {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    input {
        font-size: 1.2rem;
        max-width: 120px;
    }
}

.input-group {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.input-field {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    min-width: 300px;
}

.input-label-group {
    display: flex;
    align-items: center;
    gap: 15px;
    width: 100%;
}

.input-label-group label {
    min-width: 120px;
    text-align: right;
}

.input-label-group input {
    flex: 1;
    margin: 0;
}

.input-field input {
    width: 200px;
    border: 3px solid #4FACFE;
    transition: all 0.3s ease;
}

.input-field input:focus {
    transform: scale(1.02);
    border-color: #FF6B6B;
}

@media screen and (max-width: 768px) {
    .input-group {
        gap: 20px;
    }
    
    .input-field {
        padding: 15px;
    }
    
    .input-field input {
        width: 150px;
    }
}

@media screen and (max-width: 480px) {
    .input-field {
        padding: 10px;
        width: 100%;
    }
    
    .input-field input {
        width: 120px;
    }
}

/* 錯題列表樣式 */
.wrong-questions-container {
    margin-top: 30px;
    padding: 20px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.wrong-questions-title {
    color: #FF6B6B;
    font-size: 1.8rem;
    margin-bottom: 20px;
    text-align: center;
}

.wrong-questions-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.wrong-question-item {
    background: #F8F9FA;
    padding: 15px;
    border-radius: 10px;
    border-left: 5px solid #FF6B6B;
}

.question-content {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
}

.question-number {
    color: #4FACFE;
    font-weight: bold;
}

.question-text {
    flex: 1;
}

.wrong-mark {
    color: #FF6B6B;
    font-weight: bold;
}

.correct-answer {
    margin-top: 8px;
    color: #4FACFE;
    font-size: 1.2rem;
    padding-left: 25px;
}

/* 響應式設計 */
@media screen and (max-width: 768px) {
    .wrong-questions-title {
        font-size: 1.5rem;
    }

    .question-content {
        font-size: 1.2rem;
    }

    .correct-answer {
        font-size: 1rem;
    }
}

@media screen and (max-width: 480px) {
    .wrong-questions-container {
        padding: 15px;
    }

    .wrong-questions-title {
        font-size: 1.3rem;
    }

    .question-content {
        font-size: 1.1rem;
    }
}

/* 添加響應式設計 */
@media screen and (max-width: 768px) {
    .calculation-section {
        padding: 15px;
        gap: 5px;
    }

    .calculation-section input {
        max-width: 120px;
        min-width: 80px;
        font-size: 1.4rem;
    }

    .calculation-section .ppp {
        font-size: 1.6rem;
    }
}

@media screen and (max-width: 480px) {
    .calculation-section {
        padding: 10px;
        gap: 3px;
    }

    .calculation-section input {
        max-width: 100px;
        min-width: 60px;
        font-size: 1.2rem;
        padding: 8px;
    }

    .calculation-section .ppp {
        font-size: 1.4rem;
    }
}