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

body {
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #FFF5F7;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: linear-gradient(135deg, #FF6B6B 0%, #FFB5B5 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 2px 10px rgba(255, 107, 107, 0.2);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    opacity: 0.95;
}

.hero {
    background-color: white;
    padding: 4rem 0;
    text-align: center;
    border-bottom: 1px solid #FFE5E5;
}

.hero h2 {
    font-size: 1.8rem;
    color: #FF6B6B;
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero p {
    font-size: 1.1rem;
    color: #666;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.videos {
    padding: 4rem 0;
    background-color: #FFFAFA;
}

.videos h2 {
    text-align: center;
    font-size: 2rem;
    color: #FF6B6B;
    margin-bottom: 3rem;
    font-weight: 500;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.video-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.15);
}

.video-number {
    position: absolute;
    top: -15px;
    left: 20px;
    background: #FFB5B5;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.video-card h3 {
    color: #FF6B6B;
    margin-bottom: 1rem;
    margin-top: 1.5rem;
    font-size: 1.3rem;
    font-weight: 500;
}

.video-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 8px;
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

.cta {
    background: linear-gradient(135deg, #FFB5B5 0%, #FFDADA 100%);
    padding: 4rem 0;
    text-align: center;
}

.cta h2 {
    font-size: 2rem;
    color: #FF6B6B;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.cta-button {
    display: inline-block;
    background: #FF6B6B;
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.cta-button:hover {
    background: #FF5252;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

footer {
    background: #FF6B6B;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

footer p {
    font-size: 0.9rem;
    opacity: 0.9;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .videos h2 {
        font-size: 1.5rem;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .video-card {
        padding: 1.5rem;
    }
    
    .video-card h3 {
        font-size: 1.1rem;
    }
    
    .cta h2 {
        font-size: 1.5rem;
    }
    
    .cta p {
        font-size: 1rem;
    }
    
    .cta-button {
        padding: 0.8rem 2rem;
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    header {
        padding: 1.5rem 0;
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .videos {
        padding: 3rem 0;
    }
    
    .cta {
        padding: 3rem 0;
    }
}