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

body {
    font-family: 'Arial', 'Hiragino Sans', 'Yu Gothic', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 30px;
    padding: 40px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #667eea;
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    color: #666;
    font-size: 1.1rem;
}

.game-area {
    background: #f8f9ff;
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
}

.score-board {
    display: flex;
    justify-content: space-around;
    margin-bottom: 30px;
}

.score-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    padding: 15px 30px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.label {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.value {
    font-size: 2rem;
    font-weight: bold;
}

.value.correct {
    color: #4caf50;
}

.value.total {
    color: #2196f3;
}

.question-box {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.question-text {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 30px;
}

.number {
    color: #667eea;
    background: #f0f0ff;
    padding: 20px 30px;
    border-radius: 15px;
    min-width: 80px;
    text-align: center;
}

.plus, .equals {
    color: #666;
}

.question-mark {
    color: #ff6b6b;
    background: #fff0f0;
    padding: 20px 30px;
    border-radius: 15px;
    min-width: 80px;
    text-align: center;
}

.ten {
    color: #4caf50;
    background: #f0fff0;
    padding: 20px 30px;
    border-radius: 15px;
    min-width: 80px;
    text-align: center;
}

/* 視覚的なドット表示 */
.visual-dots {
    display: flex;
    justify-content: space-around;
    gap: 20px;
    margin-top: 20px;
}

.dots-container {
    flex: 1;
    background: #f8f9ff;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
}

.dots-label {
    color: #667eea;
    font-weight: bold;
    font-size: 1rem;
    margin-bottom: 15px;
}

.dots {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    min-height: 80px;
    align-items: center;
}

.dot {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
    animation: popIn 0.3s ease-out;
}

.dot.answer {
    background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.4);
}

@keyframes popIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* 数字ボタン */
.answer-section {
    margin-bottom: 20px;
}

.number-buttons {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.number-btn {
    font-size: 2rem;
    font-weight: bold;
    padding: 20px;
    border: 3px solid #ddd;
    border-radius: 15px;
    background: white;
    color: #667eea;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.number-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
    border-color: #667eea;
    background: #f0f0ff;
}

.number-btn:active {
    transform: translateY(0);
}

.number-btn.selected {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: #667eea;
    transform: scale(1.05);
}

.number-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-btn, .next-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 1.3rem;
    font-weight: bold;
    padding: 20px 40px;
    border: none;
    border-radius: 15px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.submit-btn:hover, .next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.submit-btn:active, .next-btn:active {
    transform: translateY(0);
}

.next-btn {
    width: 100%;
    background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
}

.feedback {
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 20px;
    animation: fadeIn 0.5s;
}

.feedback.correct {
    background: #d4edda;
    color: #155724;
    border: 3px solid #c3e6cb;
}

.feedback.incorrect {
    background: #f8d7da;
    color: #721c24;
    border: 3px solid #f5c6cb;
}

.hidden {
    display: none !important;
}

.help-section {
    background: #fff9e6;
    border-radius: 20px;
    padding: 25px;
    border: 3px dashed #ffd700;
}

.help-section h3 {
    color: #ff9800;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* 広告コンテナ */
.ad-container {
    max-width: 600px;
    margin: 20px auto;
    text-align: center;
}

/* フッター */
footer {
    text-align: center;
    padding: 20px;
    color: white;
    margin-top: 20px;
}

footer p {
    margin: 0;
}

footer a {
    color: white;
    text-decoration: underline;
}

.help-section p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.6;
}

.examples {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.example {
    background: white;
    padding: 10px 20px;
    border-radius: 10px;
    color: #667eea;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* レスポンシブデザイン */
@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    .question-text {
        font-size: 2rem;
        gap: 10px;
    }

    .number, .question-mark, .ten {
        padding: 15px 20px;
        min-width: 60px;
    }

    .number-buttons {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }

    .number-btn {
        font-size: 1.5rem;
        padding: 15px;
    }

    .dot {
        width: 20px;
        height: 20px;
    }

    .visual-dots {
        flex-direction: column;
        gap: 15px;
    }

    .submit-btn, .next-btn {
        font-size: 1.1rem;
        padding: 15px 30px;
    }
}