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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

header {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #e94560;
}

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

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: #e94560;
}

.nav-links .dropdown {
    position: relative;
}

.nav-links .dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #1a1a2e;
    min-width: 200px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    z-index: 1001;
    padding: 0.5rem 0;
}

.nav-links .dropdown:hover .dropdown-content {
    display: block;
}

.nav-links .dropdown-content a {
    display: block;
    padding: 0.8rem 1.5rem;
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.3s;
}

.nav-links .dropdown-content a:hover {
    background: #e94560;
    color: white;
}

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

.hero {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.h1-subtitle {
    font-size: 1.5rem;
    font-weight: normal;
    opacity: 0.9;
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.9;
}

.video-section {
    text-align: center;
    margin: 2rem 0;
}

.video-section video {
    max-width: 100%;
    width: 800px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.video-section iframe {
    max-width: 100%;
    width: 800px;
    height: 450px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.intro {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    margin-top: 2rem;
}

.intro h2 {
    color: #1a1a2e;
    margin-bottom: 1rem;
}

.intro p {
    max-width: 700px;
    margin: 0 auto 1.5rem;
    color: #666;
}

.key-capabilities {
    text-align: left;
    max-width: 700px;
    margin: 1.5rem auto 2rem;
    list-style: none;
}

.key-capabilities li {
    padding: 0.8rem 0;
    border-bottom: 1px solid #eee;
    color: #555;
}

.key-capabilities li:last-child {
    border-bottom: none;
}

.key-capabilities li strong {
    color: #e94560;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: #e94560;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: background 0.3s;
}

.btn:hover {
    background: #c73e54;
}

.page-header {
    text-align: center;
    padding: 2rem 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.system-overview {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.system-overview h2 {
    color: #1a1a2e;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #e94560;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.overview-text p {
    color: #666;
    line-height: 1.8;
}

.system-diagram {
    text-align: center;
    margin-top: 2rem;
}

.system-diagram img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.advantages {
    margin-bottom: 2rem;
}

.advantages h2 {
    color: #1a1a2e;
    margin-bottom: 1.5rem;
    text-align: center;
}

.advantage-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    border-left: 4px solid #e94560;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.advantage-card h3 {
    color: #1a1a2e;
    margin-bottom: 0.8rem;
}

.advantage-card p {
    color: #666;
    line-height: 1.7;
}

.benefits {
    background: white;
    padding: 2rem;
    border-radius: 10px;
}

.benefits h2 {
    color: #1a1a2e;
    margin-bottom: 1.5rem;
}

.benefits ul {
    list-style: none;
}

.benefits li {
    padding: 0.8rem 0;
    border-bottom: 1px solid #eee;
    color: #666;
}

.benefits li:last-child {
    border-bottom: none;
}

.benefits li::before {
    content: "✓";
    color: #e94560;
    margin-right: 0.8rem;
    font-weight: bold;
}

footer {
    background: #1a1a2e;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
}

footer a {
    color: #e94560;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.copyright {
    margin-top: 0.8rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.contact-icons {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.contact-icons a {
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s;
}

.contact-icons a:hover {
    color: #e94560;
}

.contact-icons i {
    font-size: 1.1rem;
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .video-section video {
        width: 100%;
    }
    
    main {
        padding: 1rem;
    }
    
    .product-tabs {
        flex-direction: column;
    }
}

.product-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.product-tab {
    padding: 1rem 2rem;
    background: white;
    color: #1a1a2e;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.product-tab:hover {
    background: #f0f0f0;
}

.product-tab.active {
    background: #e94560;
    color: white;
    border-color: #e94560;
}

.product-images {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
    justify-content: center;
}

.product-image {
    flex: 1;
    max-width: 500px;
    text-align: center;
}

.product-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.image-caption {
    margin-top: 0.8rem;
    color: #1a1a2e;
    font-weight: 600;
}

.spec-image {
    margin-top: 2rem;
    text-align: center;
}

.spec-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

@media (max-width: 768px) {
    .product-images {
        flex-direction: column;
    }
    
    .product-image {
        max-width: 100%;
    }
}