:root {
    --bg-color: #000000;
    --bg-secondary: #050505;
    --text-primary: #FFFFFF;
    --text-secondary: #B3B3B3;
    --accent-color: #79f1e5;
    --font-primary: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-secondary: 'Source Han Sans CN', 'Noto Sans SC', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

a {
    text-decoration: none;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

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

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

/* Header */
header {
    background-color: rgba(0, 0, 0, 0.9);
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo span {
    color: var(--accent-color);
}

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

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: #000; /* Fallback */
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7); /* Darker overlay for better text readability */
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.hero::before {
    /* Optional: keep or remove radial gradient. Removing it might be cleaner with video. */
    display: none; 
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, #fff, #b3b3b3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    font-weight: 600;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--accent-color);
    color: #000;
    box-shadow: 0 0 20px rgba(121, 241, 229, 0.4);
}

/* Sections */
section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 60px;
    text-align: left;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
    margin-top: 20px;
}

.category-title {
    font-size: 1.8rem;
    margin-bottom: 30px;
    margin-top: 60px;
    color: var(--text-primary);
    border-left: 4px solid var(--accent-color);
    padding-left: 15px;
}

/* Core Solutions */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.solution-card {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 8px;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.solution-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-color);
}

.solution-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.solution-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.solution-card p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Footer */
footer {
    background-color: var(--bg-secondary);
    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(200px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.footer-col h4 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

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

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-col ul li a:hover {
    color: var(--accent-color);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Contact Page */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.contact-item {
    background-color: rgba(255, 255, 255, 0.03);
    padding: 30px;
    border-radius: 8px;
}

.contact-item h3 {
    color: var(--accent-color);
    margin-bottom: 15px;
}

.contact-item p {
    color: var(--text-secondary);
}

/* Privacy Policy & Legal */
.legal-content h2 {
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.legal-content h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--accent-color);
}

.legal-content p, .legal-content ul {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.legal-content ul {
    padding-left: 20px;
}

.legal-content ul li {
    margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .section-title {
        font-size: 2rem;
    }
}