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

:root {
    /* Xilu Orange - Primary Color Palette */
    --primary-color: #ef562f;
    --primary-50: #fff5f2;
    --primary-100: #fff1ee;
    --primary-200: #ffe4de;
    --primary-300: #ffd5cc;
    --primary-400: #ffbcad;
    --primary-500: #fe795d;
    --primary-600: #ef562f;
    --primary-700: #eb4f27;
    --primary-800: #cc4522;
    --primary-900: #a5371b;
    
    /* Secondary Blue Palette */
    --secondary-50: #f0f9ff;
    --secondary-100: #e0f2fe;
    --secondary-200: #bae6fd;
    --secondary-300: #7dd3fc;
    --secondary-400: #38bdf8;
    --secondary-500: #0ea5e9;
    --secondary-600: #0284c7;
    --secondary-700: #0369a1;
    --secondary-800: #075985;
    --secondary-900: #0c4a6e;
    
    /* Grays */
    --gray-dark: #5a575e;
    --gray-light: #f5f5f5;
    
    /* Utility Colors */
    --light-bg: #F9F6F4;
    --light-bg-alt: #EFEFEC;
    --dark-text: #1a1a1a;
    --light-text: #ffffff;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--dark-text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #0a2a31;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

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

.logo img {
    height: 50px;
    width: auto;
    transition: var(--transition);
}

.logo img:hover {
    opacity: 0.8;
}

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

.nav-menu a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.lang-toggle {
    background: var(--primary-color);
    color: var(--light-text);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.lang-toggle:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.mobile-nav-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

@media (min-width: 769px) {
    .mobile-toggle {
        display: none;
    }
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background: var(--light-text);
    transition: var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-800) 0%, var(--primary-600) 100%);
    z-index: -1;
    /* Performance optimizations */
    will-change: transform;
    transform: translate3d(0, 0, 0);
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
    /* Performance optimizations for video */
    will-change: transform;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

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

.hero-content {
    text-align: center;
    color: var(--light-text);
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    letter-spacing: -2px;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 2.5rem;
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: var(--transition);
    display: inline-block;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--light-text);
}

.btn-primary:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(239, 86, 47, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--light-text);
    border: 2px solid var(--light-text);
}

.btn-secondary:hover {
    background: var(--light-text);
    color: var(--primary-color);
}

/* Solutions Section */
.solutions {
    padding: 8rem 0;
    background: var(--light-bg);
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.section-subtitle {
    font-size: 1.25rem;
    text-align: center;
    color: #666;
    margin-bottom: 4rem;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.solution-card:nth-child(3) {
    grid-column: 1 / -1;
    max-width: 100%;
}

.solution-card:nth-child(3) .card-image {
    height: 350px;
}

.solution-card {
    background: var(--light-text);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.card-image {
    height: 250px;
    background: linear-gradient(135deg, var(--card-color), rgba(0, 0, 0, 0.3));
    position: relative;
    background-size: cover;
    background-position: center;
}

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.solution-card:hover .card-overlay {
    background: rgba(0, 0, 0, 0.4);
}

.card-content {
    padding: 2rem;
}

.card-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.card-content p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.card-link {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.card-link:hover {
    color: var(--primary-color);
}

/* Stats Section */
/* About Section */
.about {
    padding: 8rem 0;
    background: var(--light-text);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.about-content p {
    margin-bottom: 1.5rem;
    color: #666;
    line-height: 1.8;
    font-size: 1.05rem;
}

.about-content .btn {
    margin-top: 1rem;
}

.about-image .image-placeholder {
    width: 100%;
    height: 400px;
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.about-logo {
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: contain;
}

/* Technology Section */
/* Contact Section */
.contact {
    padding: 8rem 0;
    background: var(--primary-color);
    color: var(--light-text);
    text-align: center;
}

.contact-content h2 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.contact-content p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
}

.contact-cta .btn-primary {
    background: var(--light-text);
    color: var(--primary-color);
}

.contact-cta .btn-primary:hover {
    background: var(--primary-100);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

/* Footer */
.footer {
    background: #0a2a31;
    color: var(--light-text);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-column h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.footer-column img {
    height: 40px;
    width: auto;
    margin-bottom: 1rem;
    display: block;
}

.footer-column h5 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.footer-column p {
    opacity: 0.8;
    line-height: 1.7;
}

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

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: var(--light-text);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-column a:hover {
    opacity: 1;
    color: var(--primary-400);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-nav-controls {
        display: flex;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
        background: var(--light-text);
        width: 100%;
        padding: 2rem;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        transition: var(--transition);
    }

    .nav-menu li {
        text-align: center;
    }

    /* Hide language toggle from nav menu on mobile since it's now in header */
    .nav-menu .lang-toggle {
        display: none;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu a {
        color: var(--dark-text);
    }

    .nav-menu a::after {
        background: var(--primary-color);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }

    .solutions-grid {
        grid-template-columns: 1fr;
    }

    .solution-card:nth-child(3) {
        grid-column: 1;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }



    .contact-content h2 {
        font-size: 2rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

}