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

body {
    font-family: 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Meiryo', sans-serif;
    line-height: 1.8;
    color: #333;
}

/* スキップリンク - アクセシビリティ対応 */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000;
    color: #fff;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ヘッダーナビゲーション */
header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

.logo img {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #ffffff;
    font-weight: 500;
    transition: color 0.3s;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: #ffcc00;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    background: none;
    border: none;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #ffffff;
    transition: 0.3s;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

html {
    scroll-behavior: smooth;
}

.hero {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    padding: 80px 20px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: #ffcc00;
    color: #1a1a2e;
    padding: 8px 24px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
    font-weight: bold;
    letter-spacing: 0.05em;
}

.hero-subtitle {
    font-size: 1.8rem;
    margin-bottom: 30px;
    font-style: italic;
    color: #ffcc00;
}

.hero-tagline {
    font-size: 1.3rem;
    margin-bottom: 50px;
    opacity: 0.95;
}

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

.intro {
    padding: 80px 20px;
    background: #f8f9fa;
    text-align: center;
}

.intro h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #1a1a2e;
}

.intro-text {
    font-size: 1.1rem;
    line-height: 2;
    color: #555;
    max-width: 800px;
    margin: 0 auto;
}

.features {
    padding: 80px 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.features h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 60px;
    color: #1a1a2e;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.feature-item {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
    border: 2px solid #e9ecef;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.18);
    border-color: #ff6b35;
}

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

.feature-item h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #1a1a2e;
}

.feature-item p {
    color: #666;
    line-height: 1.8;
}

.highlight {
    color: #ff6b35;
    font-weight: bold;
}

.use-cases {
    padding: 80px 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.use-cases h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 60px;
    color: #1a1a2e;
}

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

.use-case-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.use-case-card:hover {
    transform: translateY(-8px);
}

.use-case-header {
    padding: 30px 20px;
    text-align: center;
    font-size: 3rem;
}

.construction { background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%); }
.event { background: linear-gradient(135deg, #4834d4 0%, #686de0 100%); }
.traffic { background: linear-gradient(135deg, #26de81 0%, #20bf6b 100%); }
.emergency { background: linear-gradient(135deg, #fc5c65 0%, #fd7272 100%); }
.security { background: linear-gradient(135deg, #45aaf2 0%, #4b7bec 100%); }
.outdoor { background: linear-gradient(135deg, #fed330 0%, #f7b731 100%); }

.use-case-body {
    padding: 25px;
}

.use-case-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #1a1a2e;
}

.use-case-card p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.8;
}

.specs {
    padding: 80px 20px;
    background: white;
}

.specs h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 60px;
    color: #1a1a2e;
}

.specs-table {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.specs-table table {
    width: 100%;
    border-collapse: collapse;
}

.specs-table th {
    background: #1a1a2e;
    color: white;
    padding: 20px;
    text-align: left;
    font-weight: 600;
}

.specs-table td {
    padding: 20px;
    border-bottom: 1px solid #e9ecef;
}

.specs-table tr:last-child td {
    border-bottom: none;
}

.specs-table tr:nth-child(even) {
    background: #f8f9fa;
}

/* FAQセクション - LLMO対策重要 */
.faq {
    padding: 80px 20px;
    background: #f8f9fa;
}

.faq h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 60px;
    color: #1a1a2e;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq details {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    cursor: pointer;
    transition: box-shadow 0.3s;
}

.faq details:hover {
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.faq summary {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1a1a2e;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq summary::after {
    content: '+';
    font-size: 1.5rem;
    color: #ff6b35;
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 10px;
}

.faq details[open] summary::after {
    transform: rotate(45deg);
}

.faq details p {
    margin-top: 15px;
    line-height: 1.8;
    color: #666;
}

.cta {
    padding: 80px 20px;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
}

.cta p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background: #ff6b35;
    color: white;
    padding: 18px 50px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: bold;
    transition: background 0.3s, transform 0.3s;
}

.cta-button:hover {
    background: #ff8c42;
    transform: scale(1.05);
}

.cta-button-secondary {
    background: transparent;
    border: 3px solid #ffffff;
}

.cta-button-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #ffcc00;
    transform: scale(1.05);
}

footer {
    background: #f8f9fa;
    color: #333;
    padding: 40px 20px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.company-logo img {
    width: 125px;
    height: auto;
}

.footer-text {
    font-size: 0.9rem;
    color: #666;
    text-align: center;
}

.feature-item img {
    cursor: pointer;
    transition: transform 0.3s, opacity 0.3s, box-shadow 0.3s;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.feature-item img:hover {
    transform: scale(1.05);
    opacity: 0.95;
    box-shadow: 0 4px 15px rgba(255,107,53,0.3);
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    animation: fadeIn 0.3s;
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: zoomIn 0.3s;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
    background: none;
    border: none;
    padding: 0;
    line-height: 1;
}

.modal-close:hover,
.modal-close:focus {
    color: #ff6b35;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes zoomIn {
    from { transform: translate(-50%, -50%) scale(0.7); }
    to { transform: translate(-50%, -50%) scale(1); }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        right: -100%;
        top: 70px;
        flex-direction: column;
        background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.3);
        padding: 20px 0;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links li {
        padding: 15px 0;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .hero-tagline {
        font-size: 1.1rem;
    }
    
    .features h2,
    .use-cases h2,
    .specs h2,
    .faq h2,
    .cta h2 {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .faq summary {
        font-size: 1rem;
    }
    
    .faq summary::after {
        font-size: 1.3rem;
    }
}