body { background: #e0f7fa; font-family: 'Zen Maru Gothic', sans-serif; display: flex; flex-direction: column; align-items: center; margin: 0; padding: 20px; color: #333; }
.container { background: white; padding: 20px; border-radius: 16px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); width: 100%; max-width: 420px; text-align: center; }
h1 { font-size: 1.2rem; color: #0277bd; }
.level-badge { display: inline-block; background: #ffb74d; color: white; padding: 4px 12px; border-radius: 12px; font-size: 0.8rem; font-weight: bold; margin-bottom: 10px; }
#question-text { font-size: 1rem; font-weight: bold; margin-bottom: 20px; text-align: left; }
.options-grid { display: flex; flex-direction: column; gap: 10px; }
.back-btn {position: absolute;top: 10px;left: 15px;padding: 8px 15px;background-color: rgba(255,255,255,0.9);text-decoration: none;color: #333;font-weight: bold;border-radius: 20px;box-shadow: 0 2px 5px rgba(0,0,0,0.2);z-index: 20;font-size: 0.9rem;}
.option-btn { padding: 12px; background: #f5f5f5; border: 2px solid #b0bec5; border-radius: 10px; font-weight: bold; cursor: pointer; text-align: left; }
.option-btn.correct { background: #c8e6c9; border-color: #388e3c; }
.option-btn.incorrect { background: #ffcdd2; border-color: #d32f2f; }
.option-btn:disabled { cursor: default; opacity: 0.9; }
.hidden { display: none !important; }

/* 解説エリア */
#explanation-box {
    margin-top: 20px;
    padding: 16px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 1px solid #e0e0e0;
    text-align: left;
}
.explanation-result {
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 8px;
}
.explanation-result.result-correct { color: #2e7d32; }
.explanation-result.result-incorrect { color: #c62828; }
.explanation-answer {
    font-weight: bold;
    margin-bottom: 10px;
    color: #0277bd;
}
.explanation-text {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #555;
}

/* 次へボタン */
#next-btn {
    margin-top: 16px;
    padding: 12px 28px;
    background: #0277bd;
    color: white;
    border: none;
    border-radius: 24px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(2, 119, 189, 0.3);
    transition: background 0.2s, transform 0.1s;
}
#next-btn:hover {
    background: #01579b;
}
#next-btn:active {
    transform: scale(0.98);
}

/* 結果画面のボタン */
#result-box button {
    margin-top: 16px;
    padding: 12px 28px;
    background: #0277bd;
    color: white;
    border: none;
    border-radius: 24px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
}

/* 他のクイズへのリンク */
#other-quizzes {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
}
.other-quizzes-title {
    font-size: 0.95rem;
    font-weight: bold;
    color: #666;
    margin: 0 0 12px;
}
.other-quiz-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 8px 0;
    padding: 10px 14px;
    background: #fff8e1;
    border: 2px solid #ffcc80;
    border-radius: 12px;
    color: #e65100;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.95rem;
    transition: background 0.2s, transform 0.1s;
}
.other-quiz-btn:hover {
    background: #ffe0b2;
}
.other-quiz-btn:active {
    transform: scale(0.98);
}
.other-quiz-icon {
    width: 32px;
    height: 32px;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    flex-shrink: 0;
}