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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #000;
    color: #fff;
    line-height: 1.5;
}

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

.navbar {
    height: 80px;
    padding: 0 6%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #222;
    position: sticky;
    top: 0;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(12px);
    z-index: 100;
}

.logo {
    color: #fff;
    text-decoration: none;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 3px;
}

.navbar nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.navbar nav a {
    color: #aaa;
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s ease;
}

.navbar nav a:hover {
    color: #fff;
}

.cart-button {
    border: 1px solid #333;
    background: transparent;
    color: #fff;
    padding: 10px 15px;
    font-size: 13px;
    cursor: pointer;
    transition: 0.2s ease;
}

.cart-button:hover {
    background: #fff;
    color: #000;
}

#cart-count {
    margin-left: 5px;
    color: #888;
}


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

.hero {
    min-height: 78vh;
    display: flex;
    align-items: center;
    padding: 100px 8%;
    border-bottom: 1px solid #222;
}

.hero-content {
    max-width: 800px;
}

.eyebrow {
    color: #777;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 4px;
    margin-bottom: 25px;
}

.hero h1 {
    font-size: clamp(55px, 9vw, 120px);
    line-height: 0.92;
    letter-spacing: -6px;
    font-weight: 700;
    margin-bottom: 35px;
}

.hero-text {
    max-width: 430px;
    color: #999;
    font-size: 17px;
    margin-bottom: 35px;
}

.button {
    display: inline-block;
    padding: 15px 22px;
    background: #fff;
    color: #000;
    text-decoration: none;
    font-size: 13px;
    font-weight: 700;
    transition: 0.2s ease;
}

.button:hover {
    background: #ccc;
}


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

.products-section {
    padding: 120px 6%;
    border-bottom: 1px solid #222;
}

.section-header {
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 48px;
    letter-spacing: -2px;
}

.products {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.product {
    border: 1px solid #222;
    background: #050505;
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.product:hover {
    transform: translateY(-5px);
    border-color: #555;
}

.product-image {
    height: 300px;
    background: #0b0b0b;
    border-bottom: 1px solid #222;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image span {
    font-size: 12px;
    letter-spacing: 5px;
    color: #555;
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.product-info p {
    color: #777;
    font-size: 13px;
    min-height: 40px;
}

.product-bottom {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #222;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.product-bottom strong {
    font-size: 15px;
}

.product-bottom button {
    background: transparent;
    color: #fff;
    border: 1px solid #333;
    padding: 9px 13px;
    cursor: pointer;
    font-size: 12px;
    transition: 0.2s ease;
}

.product-bottom button:hover {
    background: #fff;
    color: #000;
}


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

.about {
    padding: 160px 8%;
    border-bottom: 1px solid #222;
}

.about h2 {
    font-size: clamp(45px, 7vw, 90px);
    line-height: 0.95;
    letter-spacing: -4px;
    margin-bottom: 35px;
}

.about > p:last-child {
    max-width: 500px;
    color: #777;
    font-size: 16px;
}


/* =========================
   CART
========================= */

#cart-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    z-index: 199;
}

.cart {
    position: fixed;
    top: 0;
    right: -420px;
    width: min(420px, 100%);
    height: 100vh;
    background: #050505;
    border-left: 1px solid #222;
    z-index: 200;
    padding: 30px;
    display: flex;
    flex-direction: column;
    transition: right 0.3s ease;
}

.cart.open {
    right: 0;
}

.cart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 25px;
    border-bottom: 1px solid #222;
}

.cart-header h2 {
    font-size: 20px;
}

.cart-header button {
    background: none;
    border: none;
    color: #fff;
    font-size: 28px;
    cursor: pointer;
}

#cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 20px 0;
}

.cart-footer {
    border-top: 1px solid #222;
    padding-top: 20px;
}

.cart-footer strong {
    display: block;
    margin-bottom: 15px;
}

.checkout {
    width: 100%;
    padding: 15px;
    border: none;
    background: #fff;
    color: #000;
    font-weight: 700;
    cursor: pointer;
}

.checkout:hover {
    background: #ccc;
}


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

footer {
    padding: 35px 6%;
    color: #555;
    font-size: 11px;
    letter-spacing: 1px;
}


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

@media (max-width: 800px) {

    .navbar {
        height: auto;
        padding: 20px;
        gap: 20px;
        flex-direction: column;
        align-items: flex-start;
    }

    .navbar nav {
        width: 100%;
        justify-content: space-between;
        gap: 10px;
    }

    .navbar nav a {
        font-size: 12px;
    }

    .hero {
        min-height: 70vh;
        padding: 80px 25px;
    }

    .hero h1 {
        font-size: 58px;
        letter-spacing: -4px;
    }

    .products-section {
        padding: 80px 20px;
    }

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

    .product-image {
        height: 240px;
    }

    .about {
        padding: 100px 25px;
    }

    .about h2 {
        font-size: 55px;
        letter-spacing: -3px;
    }
}
```