img{
    /* PCの右クリック禁止 */
    pointer-events: none;

    /* SPの長押し禁止 */
    -webkit-touch-callout:none;
    -webkit-user-select:none;
    -moz-touch-callout:none;
    -moz-user-select:none;
    user-select:none;
}

/* 全体のスタイル */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* ヘッダー */
.header-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.header-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.1)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,138.7C960,139,1056,117,1152,112C1248,107,1344,117,1392,122.7L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
    opacity: 0.3;
}

.header-section .container {
    position: relative;
    z-index: 1;
}

/* 統計カード */
.stat-card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.stat-icon {
    font-size: 2.5rem;
    color: #667eea;
}

/* クイズカード */
.quiz-card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.quiz-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.quiz-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.quiz-card .btn {
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.quiz-card .btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* 検索ボックス - 修正版 */
.input-group {
    position: relative;
    display: flex;
    align-items: stretch;
}

.input-group-text {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    background-color: transparent;
    border: none;
    z-index: 5;
    padding: 0;
    pointer-events: none;
    color: #6c757d;
    display: flex;
    align-items: center;
}

#searchInput {
    border-radius: 25px;
    padding: 12px 20px 12px 45px;
    border: 2px solid #e0e0e0;
    transition: all 0.3s ease;
    width: 100%;
    position: relative;
    z-index: 1;
    background-color: white;
}

#searchInput:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    outline: none;
}

/* フッター */
.footer-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin-top: auto;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .header-section h1 {
        font-size: 2rem;
    }
    
    .stat-card {
        margin-bottom: 1rem;
    }
}

/* カスタムスクロールバー */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

/* バッジのスタイル */
.badge {
    font-weight: 500;
    padding: 0.5em 1em;
    border-radius: 20px;
}

/* カードタイトル */
.card-title {
    color: #2d3748;
    font-weight: 600;
}

/* No Resultsメッセージ */
#noResults {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ボタンのホバー効果 */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}