/* 海洋テクノロジー業界サイト - 独自デザイン */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* ヘッダー */
.header {
    background: linear-gradient(135deg, rgba(0, 51, 102, 0.95) 0%, rgba(0, 34, 68, 0.95) 100%);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #ffffff;
    text-decoration: none;
}

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

.nav-menu a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #64b5f6;
}

/* ハンバーガーメニュー */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 3px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* メインコンテンツ */
.main-content {
    margin-top: 80px;
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ヒーローセクション */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), url('images/hero-ocean-technology.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: white;
    padding: 8rem 0 6rem;
    text-align: center;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero p {
    font-size: 1.3rem;
    max-width: 800px;
    margin: 0 auto;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

/* セクション共通 */
.section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 3rem;
    margin: 3rem 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #003366;
    position: relative;
    padding-bottom: 1rem;
}

.section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(45deg, #64b5f6, #42a5f5);
}

.section h3 {
    font-size: 1.8rem;
    margin: 2rem 0 1rem;
    color: #0066cc;
}

.section p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    text-align: justify;
}

/* ニュースリスト */
.news-list {
    list-style: none;
    margin: 2rem 0;
}

.news-item {
    background: linear-gradient(135deg, rgba(100, 181, 246, 0.1) 0%, rgba(66, 165, 245, 0.1) 100%);
    padding: 1.5rem;
    margin: 1rem 0;
    border-radius: 10px;
    border-left: 4px solid #42a5f5;
}

.news-date {
    font-size: 0.9rem;
    color: #666;
    font-weight: bold;
}

.news-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: #003366;
    margin: 0.5rem 0;
}

.news-content {
    color: #555;
    line-height: 1.7;
}

/* 画像スタイル */
.section-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 15px;
    margin: 2rem 0;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* ボタンスタイル */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(45deg, #42a5f5, #64b5f6);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin: 1rem 0;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(66, 165, 245, 0.4);
}

/* フッター */
.footer {
    background: linear-gradient(135deg, #003366 0%, #002244 100%);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

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

.footer-nav a:hover {
    color: #64b5f6;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 2rem;
    color: rgba(255, 255, 255, 0.7);
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .hamburger {
        display: flex !important;
        z-index: 1001;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: rgba(0, 51, 102, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 2rem;
        transition: left 0.3s ease;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        z-index: 999;
        gap: 1rem;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .section {
        padding: 2rem;
        margin: 2rem 0;
    }
    
    .section h2 {
        font-size: 2rem;
    }
    
    .footer-nav {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .section {
        padding: 1.5rem;
    }
}

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

.section {
    animation: fadeInUp 0.6s ease-out;
}

/* ホバーエフェクト */
.news-item:hover {
    transform: translateY(-2px);
    transition: transform 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}