/* ファイル全体のリセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

header {
    text-align: center;
    padding: 3rem 1rem 2rem;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

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

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.app-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.app-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #2d3748;
}

.app-description {
    color: #4a5568;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.app-link {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    transition: background 0.3s ease, transform 0.2s ease;
}

.app-link:hover {
    background: linear-gradient(135deg, #5a6fd8, #6a4190);
    transform: scale(1.05);
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    color: white;
    font-size: 0.9rem;
    opacity: 0.8;
}

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

@media (max-width: 480px) {
    header {
        padding: 2rem 1rem 1.5rem;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .app-card {
        padding: 1rem;
    }
    
    .app-icon {
        font-size: 2.5rem;
    }
}