/* CORE STYLES & COLORS */
:root {
    --bg-color: #1b1c1e;        
    --accent-color: #007bff;    
    --text-color: #ffffff;      
    --secondary-text: #b3b3b3;  
    --card-bg: #252629;         
}

body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    scroll-behavior: smooth;
}

/* NAVIGATION */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 50px;
    background-color: var(--bg-color);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid #333;
}

.logo img {
    height: 50px;
    width: auto;
    display: block;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 30px;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

/* HERO SECTION */
.hero {
    height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 20px;
    background: radial-gradient(circle at center, #2a2b30 0%, var(--bg-color) 70%);
}

h1 { font-size: 4rem; margin-bottom: 10px; letter-spacing: -2px; }
h2 { font-size: 2.5rem; margin-bottom: 10px; }

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

/* BUTTONS */
.cta-button {
    display: inline-block;
    padding: 15px 40px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
    text-decoration: none;
    margin: 10px;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(0, 123, 255, 0.4);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
}

.btn-outline:hover {
    background-color: var(--accent-color);
    color: white;
}

/* FEATURES GRID */
.features {
    padding: 80px 50px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    border: 1px solid #333;
    transition: border-color 0.3s;
}

.feature-card:hover { border-color: var(--accent-color); }
.feature-card h3 { margin-top: 0; color: var(--accent-color); }

/* PRODUCT SECTION (VTK) */
.product-section {
    background-color: var(--card-bg);
    padding: 80px 20px;
    text-align: center;
    border-top: 1px solid #333;
    border-bottom: 1px solid #333;
}

.product-container {
    max-width: 900px;
    margin: 0 auto;
}

/* VIDEO EMBED */
.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 ratio */
    height: 0;
    overflow: hidden;
    max-width: 100%;
    background: #000;
    border-radius: 10px;
    margin: 40px 0;
    border: 1px solid #333;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.vtk-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
    text-align: left;
}

.vtk-feature-item {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

/* PRICING SECTION */
.pricing-section {
    padding: 80px 20px;
    background-color: var(--bg-color);
    text-align: center;
}

.pricing-card {
    background-color: var(--card-bg);
    border: 1px solid var(--accent-color);
    border-radius: 15px;
    padding: 40px;
    max-width: 400px;
    margin: 0 auto;
    box-shadow: 0 0 20px rgba(0, 123, 255, 0.1);
}

.price {
    font-size: 3.5rem;
    font-weight: bold;
    color: white;
    margin: 20px 0;
}

.price span {
    font-size: 1rem;
    color: var(--secondary-text);
    font-weight: normal;
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin: 30px 0;
    text-align: left;
}

.pricing-features li {
    margin-bottom: 15px;
    color: var(--secondary-text);
}

.pricing-features li::before {
    content: "✓";
    color: var(--accent-color);
    font-weight: bold;
    margin-right: 10px;
}

/* MODAL FOR LEAD CAPTURE */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-color);
    padding: 40px;
    border-radius: 15px;
    width: 90%;
    max-width: 400px;
    border: 1px solid #333;
    text-align: center;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 15px; right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary-text);
}

.close-modal:hover { color: white; }

.modal-content input {
    width: 100%;
    padding: 15px;
    margin: 10px 0 20px 0;
    border-radius: 8px;
    border: 1px solid #444;
    background: var(--card-bg);
    color: white;
    box-sizing: border-box;
}

.modal-content input:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* TEXT PAGES (Privacy / Terms / Install) */
.text-page {
    max-width: 800px;
    margin: 50px auto;
    padding: 0 20px;
}
.text-page h1, .text-page h2 { color: var(--accent-color); }

.install-step {
    background-color: var(--card-bg);
    padding: 20px 30px;
    border-radius: 10px;
    border-left: 4px solid var(--accent-color);
    margin-bottom: 25px;
}
.install-step h3 {
    margin-top: 0;
    color: white;
}
.install-step p, .install-step li {
    color: var(--secondary-text);
}
ol {
    padding-left: 20px;
}
li {
    margin-bottom: 10px;
}
code {
    background-color: #111;
    padding: 2px 6px;
    border-radius: 4px;
    color: #00BFFF;
    font-family: monospace;
}

/* FOOTER & SOCIALS */
footer {
    text-align: center;
    padding: 40px;
    color: var(--secondary-text);
    font-size: 0.9rem;
    border-top: 1px solid #333;
}

.social-links a {
    color: var(--secondary-text);
    text-decoration: none;
    margin: 0 10px;
    font-size: 1.2rem;
}

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

.footer-links a {
    color: var(--secondary-text);
    text-decoration: none;
    margin: 0 10px;
}
.footer-links a:hover { color: white; }

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    nav { flex-direction: column; padding: 20px; }
    .nav-links { margin-top: 15px; }
    .nav-links a { margin: 0 15px; }
}