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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'CUNSHIP CONDENSED', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: #000000;
    font-weight: 300;
    overflow-x: hidden;
}

section {
    transition: all 0.5s ease-in-out;
    scroll-margin-top: 80px;
}

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

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(25px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(0, 0, 0, 0.95);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    height: 64px;
}

.nav-logo .logo-text {
    font-size: 24px;
    font-weight: 400;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 300;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0.8;
}

.nav-menu a:hover {
    color: #ffffff;
    opacity: 1;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-selector {
    position: relative;
}

.language-button {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: 20px;
    color: white;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.language-button:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(20px);
    padding: 10px 0;
    min-width: 120px;
    margin-top: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.language-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.language-option {
    width: 100%;
    background: transparent;
    border: none;
    color: white;
    padding: 10px 20px;
    text-align: left;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-button {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 10px 20px;
    border-radius: 8px;
    color: #ffffff;
    font-size: 14px;
    font-weight: 300;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-button:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.language-selector {
    position: relative;
}

.language-button {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: 20px;
    color: white;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.language-button:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.language-button::after {
    content: '▼';
    font-size: 10px;
    transition: transform 0.3s ease;
}

.language-button.active::after {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(20px);
    padding: 10px 0;
    min-width: 120px;
    margin-top: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

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

.language-option {
    width: 100%;
    background: transparent;
    border: none;
    color: white;
    padding: 10px 20px;
    text-align: left;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: url('https://s.panlai.com/upload/bizhihui_com_20231111140917169968295720629.jpg-arthumbs') center/cover no-repeat;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    text-align: center;
    z-index: 2;
    position: relative;
}

.hero-title {
    font-size: 60px;
    font-weight: 400;
    margin-bottom: 20px;
    color: #ffffff;
    letter-spacing: -1px;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 20px;
    font-weight: 400;
    margin-bottom: 40px;
    color: #b3b3b3;
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    animation: fadeInUp 1s ease-out 0.6s both;
}

.cta-button {
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 300;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.cta-button.primary {
    background: #ffffff;
    color: #000000;
}

.cta-button.secondary {
    background: transparent;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.cta-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.cta-button.primary:hover {
    background: #f0f0f0;
}

.cta-button.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: #b3b3b3;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    animation: bounce 2s infinite;
}

.arrow {
    width: 2px;
    height: 16px;
    background: rgba(255, 255, 255, 0.5);
    margin: 8px auto 0;
    position: relative;
}

.arrow::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: -3px;
    width: 0;
    height: 0;
    border-left: 3px solid transparent;
    border-right: 3px solid transparent;
    border-top: 4px solid rgba(255, 255, 255, 0.5);
}

.section-title {
    font-size: 40px;
    font-weight: 400;
    text-align: center;
    margin-bottom: 16px;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 16px;
    font-weight: 400;
    text-align: center;
    color: #b3b3b3;
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.products-section {
    padding: 120px 0;
    background: url('https://s.panlai.com/upload/bizhihui_com_20231111000031169963203192342.jpg-arthumbs') center/cover no-repeat fixed;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.product-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 30px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.product-image {
    height: 200px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

.product-placeholder {
    font-size: 16px;
    font-weight: 500;
    color: #ffffff;
}

.product-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #ffffff;
}

.product-info p {
    color: #b3b3b3;
    margin-bottom: 16px;
    line-height: 1.6;
    font-size: 14px;
}

.product-features {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.product-features span {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 400;
}

.product-button {
    background: transparent;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.product-button:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.solutions-section {
    padding: 120px 0;
    background: url('https://s.panlai.com/zb_users/upload/2026/01/bizhihui_com_202601111768138736313806.jpg-arthumbs') center/cover no-repeat fixed;
}

.solutions-tabs {
    margin-top: 60px;
}

.tab-nav {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-button {
    background: transparent;
    color: #b3b3b3;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 10px 18px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-button.active {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.3);
}

.tab-button:hover:not(.active) {
    color: #007AFF;
}

.tab-content {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 40px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.solution-text h3 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ffffff;
}

.solution-text p {
    color: #a8a8a8;
    margin-bottom: 30px;
    line-height: 1.6;
}

.solution-text ul {
    list-style: none;
}

.solution-text li {
    color: #a8a8a8;
    margin-bottom: 10px;
    position: relative;
    padding-left: 20px;
}

.solution-text li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #007AFF;
    font-weight: bold;
}

.solution-visual {
    height: 300px;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-placeholder {
    font-size: 18px;
    font-weight: 600;
    color: #007AFF;
}

.technology-section {
    padding: 120px 0;
    background: url('https://s.panlai.com/upload/20231108175856169943753643432.jpg-arthumbs?timestamp=1706121600') center/cover no-repeat fixed;
    background-size: 100% 100%;
    background-attachment: scroll;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.tech-item {
    text-align: center;
    padding: 40px 20px;
}

.tech-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #007AFF, #5856D6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: white;
    margin: 0 auto 20px;
}

.tech-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #ffffff;
}

.tech-item p {
    color: #b3b3b3;
    line-height: 1.6;
    font-size: 14px;
}

.about-section {
    padding: 120px 0;
    background: url('https://images.unsplash.com/photo-1509228627152-9d16d0903dfd?auto=format&fit=crop&q=80&w=1000') center/cover no-repeat fixed;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.about-text p {
    color: #b3b3b3;
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 32px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: #b3b3b3;
}

.about-visual {
    height: 400px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-placeholder {
    font-size: 16px;
    font-weight: 500;
    color: #ffffff;
}

.technology-section {
    padding: 120px 0;
    background: url('https://images.unsplash.com/photo-1538370965046-79c0d6907d47?auto=format&fit=crop&q=80&w=1000') center/cover no-repeat fixed;
}

.contact-section {
    padding: 120px 0;
    background: url('https://s.panlai.com/zb_users/upload/2025/12/bizhihui_com_202512241766588057501546.jpg-arthumbs') center/cover no-repeat fixed;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 60px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #ffffff;
    font-size: 14px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.3);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #b3b3b3;
}

.submit-button {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px 24px;
    border-radius: 8px;
    color: #ffffff;
    font-size: 14px;
    font-weight: 300;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.submit-button:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.4);
}

.contact-info {
    padding: 32px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
    color: #ffffff;
}

.info-item {
    margin-bottom: 16px;
}

.info-item strong {
    color: #ffffff;
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
}

.info-item span {
    color: #b3b3b3;
    font-size: 14px;
}

.footer {
    background: #000000;
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: #ffffff;
}

.footer-section p {
    color: #b3b3b3;
    line-height: 1.6;
    font-size: 14px;
}

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

.footer-section li {
    margin-bottom: 8px;
}

.footer-section a {
    color: #b3b3b3;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 14px;
}

.footer-section a:hover {
    color: #ffffff;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: #b3b3b3;
    font-size: 13px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes twinkle {
    0% {
        opacity: 0.3;
    }
    100% {
        opacity: 0.8;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(-50%) translateX(0);
    }
    50% {
        transform: translateY(-50%) translateX(10px);
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 20px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .products-grid,
    .tech-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .solution-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .earth {
        width: 200px;
        height: 200px;
        right: 5%;
    }
}