:root {
    --bg-deep: #030303;
    --bg-surface: #0a0a0a;
    --bg-card: rgba(20, 20, 20, 0.6);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-tertiary: #52525b;
    --accent: #3b82f6; 
    --accent-glow: rgba(59, 130, 246, 0.15);
    --border: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    --glass: rgba(255, 255, 255, 0.03);
    --space-xs: 0.5rem;
    --space-s: 1.5rem;
    --space-m: 3rem;
    --space-l: 6rem;
    --space-xl: 10rem;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-deep);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-m);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(3, 3, 3, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: background 0.3s var(--ease-out);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo h1 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: color 0.3s var(--ease-out);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -21px;
    left: 0;
    width: 0;
    height: 1px;
    background: #00f2ff;
    transition: width 0.3s var(--ease-out);
    border-radius: 2px;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a.active::after {
    width: 100%;
}

.lang-toggle-btn {
    background: var(--glass);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem 1.25rem;
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all 0.3s var(--ease-out);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 80px;
}

.lang-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

#three-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.6;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    text-align: center;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 1.5rem;
    background: linear-gradient(180deg, #ffffff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin: 0 auto 3rem auto;
    font-weight: 400;
    letter-spacing: -0.01em;
    max-width: 600px;
    line-height: 1.6;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2.5rem;
    background: var(--text-primary);
    color: var(--bg-deep);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 999px;
    transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out), background 0.3s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
    background: #ffffff;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-l);
    color: var(--text-primary);
}

.about {
    padding: var(--space-xl) 0;
}

.about-text {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.8;
}

.about-section {
    margin: 0 auto;
}

.about-subtitle {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.about-tagline {
    font-size: 1.125rem;
    color: var(--accent);
    margin-bottom: 2.5rem;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.about-concept,
.about-business,
.about-commitment {
    margin: 2.5rem 0;
    padding: 2rem;
    background: var(--glass);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.concept-title {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.concept-desc {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.concept-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.concept-list li {
    padding: 0.75rem 0;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    border-bottom: 1px solid var(--border);
}

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

.concept-list strong {
    color: var(--text-primary);
    font-weight: 600;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.business-item {
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border: 1px solid var(--border);
    transition: all 0.3s var(--ease-out);
}

.business-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-hover);
}

.business-item strong {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.business-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

.about-mission {
    margin-top: 3rem;
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
    color: var(--text-primary);
    letter-spacing: 0.05em;
    padding: 2rem;
    background: linear-gradient(135deg, var(--accent-glow) 0%, rgba(59, 130, 246, 0.05) 100%);
    border-radius: 12px;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.products {
    padding: var(--space-xl) 0;
    position: relative;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    padding: 3rem 2.5rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    transition: all 0.5s var(--ease-out);
    position: relative;
    overflow: hidden;
}

.product-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.04;
    pointer-events: none;
    mix-blend-mode: overlay;
    z-index: 0;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    opacity: 0;
    transition: opacity 0.5s;
    z-index: 2;
}

.product-card > * {
    position: relative;
    z-index: 1;
}

.product-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.05);
}

.product-card:hover::before {
    opacity: 1;
}

.product-icon {
    margin-bottom: 1.5rem;
    opacity: 0.9;
    color: white;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    width: 48px;
    height: 48px;
    border-radius: 12px;
    justify-content: center;
    transition: all 0.3s var(--ease-out);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.product-card:hover .product-icon {
    background: #000000;
    color: white;
    border-color: white;
    transform: scale(1.05);
}

.product-icon svg {
    display: block;
    width: 24px;
    height: 24px;
}

.product-title {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.product-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    font-weight: 400;
}

.product-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    border-bottom: 1px solid rgba(255,255,255,0.2);
    padding-bottom: 2px;
    transition: border-color 0.3s;
}

.product-link:hover {
    border-color: var(--text-primary);
}

.advantages {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 4rem;
}

.advantage-item h3 {
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.advantage-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.contact {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--border);
}

.contact-info {
    display: flex;
    gap: 8rem;
    margin-top: 2rem;
}

.contact-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
}

.contact-item a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    transition: color 0.3s;
    display: block;
}

.contact-item .sub-link {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 0.25rem;
}

.contact-item .contact-value {
    color: var(--text-primary);
    font-size: 1.1rem;
    transition: color 0.3s;
    display: block;
}

.contact-item a:hover {
    color: var(--accent);
}

.reveal-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

.product-card:nth-child(2) { transition-delay: 0.1s; }
.product-card:nth-child(3) { transition-delay: 0.2s; }

.footer-content {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.beian-link {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.8rem;
}

.beian-link:hover {
    color: var(--text-secondary);
}

.footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    margin-left: 1rem;
}

.desktop-only {
    display: block;
}

.mobile-lang-switcher {
    display: none;
    margin-top: 2rem;
    width: 100%;
    padding: 0 2rem;
}

.lang-toggle-btn.secondary {
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    font-size: 1rem;
}

@media (max-width: 768px) {
    .desktop-only {
        display: none;
    }

    .mobile-lang-switcher {
        display: block;
    }
    
    :root {
        --space-m: 1.25rem;
        --space-l: 3rem;
        --space-xl: 5rem;
    }
    
    .nav-content {
        height: 70px;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        height: calc(100vh - 70px);
        background: rgba(3, 3, 3, 0.98);
        backdrop-filter: blur(30px);
        -webkit-backdrop-filter: blur(30px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1.5rem;
        padding: 2rem;
        opacity: 0;
        visibility: hidden;
        transform: scale(0.95);
        transition: all 0.4s var(--ease-out);
        z-index: 999;
        margin: 0;
    }

    .nav-links.mobile-active {
        opacity: 1;
        visibility: visible;
        transform: scale(1);
    }

    .nav-links a {
        font-size: 1.5rem;
        padding: 1rem;
        width: 100%;
        text-align: center;
    }

    .nav-links a::after {
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
    }

    .nav-links a.active::after {
        width: 40px;
    }

    .hero-title {
        font-size: clamp(2.25rem, 8vw, 3.5rem);
        margin-bottom: 1rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
        margin: 0 auto 2.5rem auto;
    }

    .products-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .product-card {
        padding: 2.5rem 2rem;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .contact-info {
        flex-direction: column;
        gap: 2.5rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
}