@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&display=swap');

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 16px;
    line-height: 1.8;
    color: #333333;
    background-color: #ffffff;
}

a {
    color: inherit;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

a:hover {
    opacity: 0.8;
}

img {
    max-width: 100%;
    height: auto;
}

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

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 16px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #ffffff;
    font-size: 20px;
    font-weight: 700;
}

.logo img {
    width: 36px;
    height: 36px;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 140px 0 80px;
    text-align: center;
    color: #ffffff;
}

.hero h1 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
}

.hero p {
    font-size: 18px;
    opacity: 0.9;
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: #333333;
}

.plugins-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.plugin-card {
    background: #ffffff;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.plugin-card:hover {
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.15);
    transform: translateY(-4px);
}

.plugin-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: #333333;
}

.plugin-card .description {
    font-size: 14px;
    color: #666666;
    margin-bottom: 16px;
}

.plugin-card .features {
    font-size: 13px;
    color: #667eea;
    font-weight: 500;
    margin-bottom: 16px;
}

.plugin-card .status {
    display: inline-block;
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.status.available {
    background: #e8f5e9;
    color: #2e7d32;
}

.status.coming-soon {
    background: #fff3e0;
    color: #ef6c00;
}

.plugin-card .btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-disabled {
    background: #e0e0e0;
    color: #999999;
    cursor: not-allowed;
}

.btn-disabled:hover {
    opacity: 1;
    transform: none;
}

.concept-section {
    background: #f8f9fa;
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.concept-item {
    text-align: center;
    padding: 24px 16px;
}

.concept-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.concept-item h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: #333333;
}

.concept-item p {
    font-size: 14px;
    color: #666666;
}

footer {
    background: #333333;
    color: #ffffff;
    padding: 40px 0;
    text-align: center;
}

.footer-links {
    margin-bottom: 16px;
}

.footer-links a {
    color: #ffffff;
    margin: 0 16px;
    font-size: 14px;
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
}

.copyright {
    font-size: 13px;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 24px;
        margin-bottom: 32px;
    }
    
    .plugins-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .concept-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 24px;
    }
    
    .hero p {
        font-size: 14px;
    }
    
    .plugin-card {
        padding: 24px 16px;
    }
    
    .concept-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links a {
        display: block;
        margin: 8px 0;
    }
}