/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', 'Noto Sans SC', 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* Navigation */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-image {
    height: 100px;
    width: auto;
    max-width: 350px;
    object-fit: contain;
    transition: all 0.3s ease;
}

.logo-image:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.nav-logo a {
    text-decoration: none;
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list li {
    margin: 0 15px;
    position: relative;
}

.nav-link {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    padding: 10px 0;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #3498db;
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 5px;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    list-style: none;
    padding: 10px 0;
}

/* Anchor Link Offset for Fixed Navbar */
#research-direction {
    position: relative;
    padding-top: 90px;
    margin-top: -90px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #2c3e50;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.dropdown-menu a:hover {
    background-color: #f8f9fa;
    color: #3498db;
}

/* Language Switcher */
.nav-lang {
    display: flex;
    gap: 10px;
}

.lang-btn {
    padding: 8px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    text-decoration: none;
    color: #666;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.lang-btn:hover,
.lang-btn.active {
    background-color: #3498db;
    color: #fff;
    border-color: #3498db;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #2c3e50;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 120px 0 80px;
    text-align: center;
}

.hero-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.3rem;
    line-height: 1.8;
    opacity: 0.9;
    max-width: 800px;
}

/* Hero Image */
.hero-image {
    width: 100%;
    max-width: 800px;
    position: relative;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.main-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.main-image:hover {
    transform: scale(1.02);
}



/* Intro Section */
.intro {
    padding: 80px 0;
    background: #f8f9fa;
}

.intro-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.intro-content h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.intro-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 40px;
}

/* Company Overview */
.company-overview {
    padding: 80px 0;
}

.overview-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.overview-content h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.overview-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 40px;
}

/* Business Preview */
.business-preview {
    padding: 80px 0;
    background: #f8f9fa;
}

.business-preview h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 50px;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.business-card {
    background: #fff;
    padding: 40px 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.business-card h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
}

.business-card p {
    color: #666;
    line-height: 1.6;
}

/* News Section */
.news {
    padding: 60px 0;
}

.news h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.news-content {
    text-align: center;
}

.news-link {
    display: inline-block;
    padding: 15px 30px;
    background: #3498db;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.news-link:hover {
    background: #2980b9;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 120px 0 60px;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

/* Business Details */
.business-details {
    padding: 80px 0;
}

.business-section {
    margin-bottom: 80px;
}

.section-content h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
    text-align: center;
}

.section-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 30px;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.feature-list {
    max-width: 800px;
    margin: 0 auto;
}

.feature-item {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.feature-item h4 {
    font-size: 1.3rem;
    color: #2c3e50;
    margin-bottom: 15px;
}

.feature-item ul {
    list-style: none;
    padding: 0;
}

.feature-item li {
    padding: 8px 0;
    color: #666;
    position: relative;
    padding-left: 20px;
}

.feature-item li:before {
    content: "•";
    color: #3498db;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Company Details */
.company-intro {
    padding: 60px 0;
    background: #f8f9fa;
}

.company-intro .intro-content {
    text-align: center;
}

.company-intro h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

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

.company-details {
    padding: 80px 0;
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.detail-card {
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.detail-card h3 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 30px;
    text-align: center;
}

.detail-item {
    display: flex;
    margin-bottom: 20px;
    align-items: flex-start;
}

.detail-item .label {
    font-weight: 600;
    color: #2c3e50;
    min-width: 120px;
    margin-right: 15px;
}

.detail-item .value {
    color: #666;
    flex: 1;
}

.group-info {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid #eee;
}

.group-info h4 {
    font-size: 1.3rem;
    color: #2c3e50;
    margin-bottom: 15px;
}

.group-info ul {
    list-style: none;
    padding: 0;
}

.group-info li {
    padding: 8px 0;
    color: #666;
}

.company-mission {
    padding: 80px 0;
    background: #f8f9fa;
}

.mission-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.mission-content h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.mission-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 20px;
}

/* Technology Areas */
.technology-intro {
    padding: 60px 0;
    background: #f8f9fa;
}

.technology-intro .intro-content {
    text-align: center;
}

.technology-intro h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

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

.technology-areas {
    padding: 80px 0;
}

.technology-areas h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 50px;
}

.areas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.area-card {
    background: #fff;
    padding: 40px 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.area-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.area-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.area-card h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
}

.area-card p {
    color: #666;
    line-height: 1.6;
}

/* Submission Info */
.submission-info {
    padding: 80px 0;
    background: #f8f9fa;
}

.submission-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.submission-content h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.contact-info {
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.contact-info h3 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 20px;
}

.contact-info p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    margin-bottom: 20px;
}

.email-contact {
    margin: 30px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 5px;
}

.email-contact strong {
    color: #2c3e50;
    margin-right: 10px;
}

.email-contact a {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
}

.email-contact a:hover {
    text-decoration: underline;
}

.note {
    font-style: italic;
    color: #888;
    font-size: 0.95rem;
}

.partnership-info {
    padding: 80px 0;
}

.partnership-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.partnership-content h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.partnership-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background: #3498db;
    color: #fff;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: #3498db;
    border: 2px solid #3498db;
}

.btn-secondary:hover {
    background: #3498db;
    color: #fff;
    transform: translateY(-2px);
}

/* Footer */
footer {
    background: #2c3e50;
    color: #fff;
    padding: 60px 0 20px;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: #fff;
}

.footer-section p {
    color: #bdc3c7;
    line-height: 1.6;
    margin-bottom: 10px;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #3498db;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .intro-content h2,
    .overview-content h2,
    .business-preview h2,
    .news h2,
    .page-header h1,
    .section-content h2,
    .company-intro h2,
    .mission-content h2,
    .technology-intro h2,
    .technology-areas h2,
    .submission-content h2,
    .partnership-content h2 {
        font-size: 2rem;
    }
    
    .business-grid,
    .areas-grid {
        grid-template-columns: 1fr;
    }
    
    .details-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-container {
        height: 60px;
    }
    
    .logo-image {
        height: 80px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .page-header {
        padding: 100px 0 40px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .business-card,
    .area-card,
    .detail-card {
        padding: 30px 20px;
    }
    
    .contact-info {
        padding: 30px 20px;
    }
    
    .image-grid {
        grid-template-columns: 1fr;
    }
}

/* Product Applications Section */
.product-applications {
    padding: 80px 0;
}

.product-applications h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 50px;
}

.application-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
}

.application-card {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    overflow: hidden;
}

.card-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.application-card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: 30px;
}

.card-content h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
}

.card-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
}

.feature-list ul {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: 8px 0;
    color: #666;
    position: relative;
    padding-left: 20px;
}

.feature-list li:before {
    content: "•";
    color: #3498db;
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Image Gallery Section */
.image-gallery {
    padding: 80px 0;
    background: #f8f9fa;
}

.gallery-title {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 50px;
}

.gallery-category {
    margin-bottom: 80px;
}

.category-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 30px;
    border-radius: 10px 10px 0 0;
    margin-bottom: 0;
}

.category-header h3 {
    font-size: 1.8rem;
    margin: 0;
}

.category-content {
    background: white;
    padding: 40px;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.image-item {
    text-align: center;
}

.image-item img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-item img:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.image-caption {
    margin-top: 15px;
    font-size: 1.1rem;
    color: #2c3e50;
    font-weight: 500;
}