```css
/* =========================
   RESET
========================= */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #0a0a0a;
    color: #ffffff;
    line-height: 1.6;
}


/* =========================
   GLOBAL
========================= */

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section {
    padding: 100px 0;
}

a {
    color: inherit;
    text-decoration: none;
}

.eyebrow {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    color: #19bfff;
    margin-bottom: 15px;
}

h1,
h2,
h3 {
    line-height: 1.1;
}

h2 {
    font-size: clamp(32px, 5vw, 55px);
}


/* =========================
   NAVBAR
========================= */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    border-bottom: 1px solid #222;
    z-index: 1000;
}

.nav-container {
    height: 75px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 20px;
    font-weight: 900;
    letter-spacing: 2px;
}

nav {
    display: flex;
    gap: 30px;
}

nav a {
    font-size: 14px;
    color: #cccccc;
    transition: 0.2s;
}

nav a:hover {
    color: #19bfff;
}


/* =========================
   HERO
========================= */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;

    background:
        radial-gradient(
            circle at 80% 40%,
            rgba(25, 191, 255, 0.15),
            transparent 35%
        ),
        #0a0a0a;
}

.hero-content {
    padding-top: 75px;
}

.hero h1 {
    font-size: clamp(55px, 10vw, 120px);
    font-weight: 900;
    letter-spacing: -3px;
    margin-bottom: 25px;
}

.hero-text {
    max-width: 500px;
    font-size: 19px;
    color: #bdbdbd;
    margin-bottom: 35px;
}


/* =========================
   BUTTONS
========================= */

.hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.button {
    display: inline-block;
    padding: 14px 25px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 1px;
    transition: 0.2s;
}

.button-primary {
    background: #19bfff;
    color: #000000;
}

.button-primary:hover {
    background: #ffffff;
}

.button-secondary {
    border: 1px solid #555;
    color: #ffffff;
}

.button-secondary:hover {
    border-color: #19bfff;
    color: #19bfff;
}


/* =========================
   SECTION HEADING
========================= */

.section-heading {
    margin-bottom: 50px;
}

.section-heading > p:last-child {
    color: #999;
    margin-top: 15px;
}


/* =========================
   PRODUCTS
========================= */

.products {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.product-card {
    background: #111111;
    border: 1px solid #222;
    transition: 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    border-color: #19bfff;
}

.product-image {
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #171717;
    color: #555;
    font-size: 12px;
    letter-spacing: 2px;
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.product-info p {
    color: #999;
    margin-bottom: 20px;
}

.text-link {
    color: #19bfff;
    font-size: 14px;
    font-weight: 700;
}


/* =========================
   ABOUT
========================= */

.about-section {
    background: #111111;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.about-content p {
    color: #aaa;
    margin-bottom: 20px;
    font-size: 18px;
}


/* =========================
   CONTACT
========================= */

.contact-section {
    text-align: center;
}

.contact-content {
    max-width: 700px;
}

.contact-section p:not(.eyebrow) {
    color: #999;
    margin: 20px auto 30px;
    font-size: 18px;
}


/* =========================
   FOOTER
========================= */

footer {
    border-top: 1px solid #222;
    padding: 50px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

.footer-content p {
    color: #777;
    margin-top: 5px;
}

.footer-links {
    display: flex;
    gap: 25px;
}

.footer-links a {
    color: #999;
    font-size: 14px;
}

.footer-links a:hover {
    color: #19bfff;
}

.copyright {
    text-align: center;
    color: #555;
    font-size: 12px;
    margin-top: 50px;
}


/* =========================
   MOBILE
========================= */

@media (max-width: 768px) {

    .nav-container {
        height: 65px;
    }

    nav {
        display: none;
    }

    .section {
        padding: 70px 0;
    }

    .hero h1 {
        letter-spacing: -2px;
    }

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

    .product-image {
        height: 280px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-content {
        flex-direction: column;
    }

    .footer-links {
        flex-wrap: wrap;
    }
}
```