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

/* 基本設定 */
body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* ヘッダー */
.header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.logo p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    flex-wrap: wrap;
}

.nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

.nav a:hover {
    color: #ffd700;
}

/* メインコンテンツ */
.main {
    min-height: 80vh;
}

/* ヒーローセクション */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 4rem 0;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: #ffd700;
    color: #333;
}

.btn-primary:hover {
    background: #ffed4e;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 215, 0, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: #333;
    transform: translateY(-2px);
}

/* 特徴セクション */
.features {
    padding: 4rem 0;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 15px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e9ecef;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: #1e3c72;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

/* 市場概況 */
.market-overview {
    padding: 4rem 0;
    background: #f8f9fa;
}

.market-overview h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

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

.market-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    border: 1px solid #e9ecef;
}

.market-item h3 {
    color: #1e3c72;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.price {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #333;
}

.change {
    font-size: 1.1rem;
    font-weight: 600;
}

.change.positive {
    color: #28a745;
}

.change.negative {
    color: #dc3545;
}

/* ニュースセクション */
.latest-news {
    padding: 4rem 0;
    background: white;
}

.latest-news h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.news-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid #e9ecef;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.news-date {
    color: #6c757d;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.news-card h3 {
    color: #1e3c72;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    line-height: 1.4;
}

.news-card p {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.read-more {
    color: #1e3c72;
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid #1e3c72;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: #2a5298;
}

/* 投資のヒント */
.investment-tips {
    padding: 4rem 0;
    background: #f8f9fa;
}

.investment-tips h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

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

.tip {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    border: 1px solid #e9ecef;
}

.tip h3 {
    color: #1e3c72;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.tip p {
    line-height: 1.6;
    color: #555;
}

/* フッター */
.footer {
    background: #1e3c72;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: #ffd700;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #ffd700;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #2a5298;
    color: #b8c2cc;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        text-align: center;
    }
    
    .nav ul {
        justify-content: center;
        margin-top: 1rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid,
    .market-grid,
    .news-grid,
    .tips-content {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 2rem 0;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .features,
    .market-overview,
    .latest-news,
    .investment-tips {
        padding: 2rem 0;
    }
    
    .feature-card,
    .market-item,
    .news-card,
    .tip {
        padding: 1.5rem;
    }
}

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

.feature-card,
.market-item,
.news-card,
.tip {
    animation: fadeInUp 0.6s ease-out;
}

/* ホバーエフェクト */
.feature-card:hover,
.market-item:hover,
.news-card:hover,
.tip:hover {
    border-color: #1e3c72;
}

/* スクロールバーのカスタマイズ */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: #1e3c72;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2a5298;
}