/* リセットCSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基本スタイル */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* ヘッダー */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 300;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* メインコンテナ */
main {
    padding: 3rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* アプリコンテナ（フレックスボックス） */
.apps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    justify-items: center;
    align-items: stretch;
}

/* アプリカード */
.app-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
    flex: 1 1 280px;
    max-width: 320px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(0, 0, 0, 0.05);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
    border-color: rgba(102, 126, 234, 0.2);
}

/* アプリ情報 */
.app-info {
    padding: 1.8rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
}

.app-info h3 {
    font-size: 1.4rem;
    margin-bottom: 1.2rem;
    color: #2c3e50;
    font-weight: 600;
    line-height: 1.3;
}

.app-info p {
    color: #666;
    line-height: 1.7;
    font-size: 1rem;
    margin: 0;
}

/* フッター */
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
}

footer p {
    opacity: 0.8;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .apps-container {
        grid-template-columns: 1fr;
        gap: 1.2rem;
    }
    
    .app-card {
        max-width: 100%;
        width: 100%;
        min-height: 180px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 2rem 1rem;
    }
    
    .app-info {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    header {
        padding: 1.5rem 1rem;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    main {
        padding: 1.5rem 0.8rem;
    }
    
    .apps-container {
        gap: 1rem;
    }
    
    .app-card {
        min-height: 160px;
        max-width: 100%;
    }
    
    .app-info {
        padding: 1.2rem;
    }
    
    .app-info h3 {
        font-size: 1.2rem;
        margin-bottom: 1rem;
    }
    
    .app-info p {
        font-size: 0.9rem;
    }
    
    footer {
        padding: 1.5rem 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 360px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    header p {
        font-size: 0.9rem;
    }
    
    .app-card {
        min-height: 140px;
    }
    
    .app-info {
        padding: 1rem;
    }
    
    .app-info h3 {
        font-size: 1.1rem;
    }
    
    .app-info p {
        font-size: 0.85rem;
    }
}

/* タッチデバイス対応 */
@media (hover: none) and (pointer: coarse) {
    .app-card {
        min-height: 180px;
    }
    
    .app-card:active {
        transform: translateY(-4px);
    }
    
    /* タッチ時のホバー効果を調整 */
    .app-card:hover {
        transform: translateY(0);
    }
}

/* アニメーション */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.app-card {
    animation: fadeInUp 0.6s ease forwards;
}

.app-card:nth-child(1) { animation-delay: 0.1s; }
.app-card:nth-child(2) { animation-delay: 0.15s; }
.app-card:nth-child(3) { animation-delay: 0.2s; }
.app-card:nth-child(4) { animation-delay: 0.25s; }
.app-card:nth-child(5) { animation-delay: 0.3s; }
.app-card:nth-child(6) { animation-delay: 0.35s; }
.app-card:nth-child(7) { animation-delay: 0.4s; }
.app-card:nth-child(8) { animation-delay: 0.45s; }
.app-card:nth-child(9) { animation-delay: 0.5s; }
.app-card:nth-child(10) { animation-delay: 0.55s; }

/* アクセシビリティ向上 */
.app-card:focus {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

.app-card:focus-visible {
    outline: 3px solid #667eea;
    outline-offset: 2px;
}

/* ローディング状態 */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* 成功状態 */
.success {
    border: 2px solid #27ae60;
    background: linear-gradient(135deg, #ffffff 0%, #f8fff8 100%);
}