* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: #080808;
    color: #fff;
    font-family: Arial, Helvetica, sans-serif;
}

/* =========================
   HEADER
   ========================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(5, 5, 5, .96);
    border-bottom: 1px solid rgba(255,255,255,.08);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow: 0 8px 35px rgba(0,0,0,.35);
}

.header-inner {
    max-width: 1350px;
    min-height: 82px;
    margin: auto;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

/* LOGO */

.brand {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    line-height: .85;
    min-width: 220px;
}

.brand-main {
    color: #e10600;
    font-size: 34px;
    font-weight: 900;
    letter-spacing: 4px;
    text-shadow: 0 0 25px rgba(225,6,0,.18);
}

.brand-sub {
    color: #fff;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 6px;
    margin-top: 9px;
    opacity: .85;
}

/* MENU */

.main-nav {
    display: flex;
    align-items: center;
    gap: 3px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.main-nav a {
    position: relative;
    color: #aaa;
    text-decoration: none;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 1.4px;
    padding: 13px 15px;
    border-radius: 4px;
    transition: color .25s ease, background .25s ease;
}

.main-nav a::after {
    content: "";
    position: absolute;
    left: 15px;
    right: 15px;
    bottom: 6px;
    height: 2px;
    background: #e10600;
    transform: scaleX(0);
    transition: transform .25s ease;
    transform-origin: center;
}

.main-nav a:hover {
    color: #fff;
    background: rgba(255,255,255,.045);
}

.main-nav a:hover::after {
    transform: scaleX(1);
}

/* PREMIUM */

.main-nav .premium-nav {
    color: #fff;
    background: linear-gradient(
        135deg,
        rgba(225,6,0,.20),
        rgba(225,6,0,.05)
    );
    border: 1px solid rgba(225,6,0,.45);
}

.main-nav .premium-nav span {
    color: #e10600;
    margin-right: 5px;
}

.main-nav .premium-nav:hover {
    background: #e10600;
    border-color: #e10600;
}

.main-nav .premium-nav:hover span {
    color: #fff;
}

/* LOGIN */

.main-nav .login-link {
    color: #fff;
    border: 1px solid #333;
}

.main-nav .login-link:hover {
    border-color: #e10600;
}

/* REGISTER */

.main-nav .register-link {
    background: #e10600;
    color: #fff;
    margin-left: 4px;
}

.main-nav .register-link:hover {
    background: #b80500;
}

/* =========================
   BOTONES
   ========================= */

.btn-red,
.hero-button {
    display: inline-block;
    padding: 13px 22px;
    background: #e10600;
    color: #fff;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
    transition: background .2s ease, transform .2s ease;
}

.btn-red:hover,
.hero-button:hover {
    background: #b80500;
    transform: translateY(-2px);
}

/* =========================
   CONTENEDOR
   ========================= */

.page-container {
    max-width: 1250px;
    margin: auto;
    padding: 40px 25px;
}

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

.site-footer {
    position: relative;
    margin-top: 100px;
    background: linear-gradient(
        180deg,
        #0b0b0b 0%,
        #050505 100%
    );
    border-top: 1px solid #222;
    color: #777;
}

.site-footer::before {
    content: "";
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        #e10600,
        transparent
    );
}

.footer-inner {
    max-width: 1250px;
    margin: auto;
    padding: 65px 30px 50px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.3fr;
    gap: 60px;
}

/* FOOTER BRAND */

.footer-logo {
    color: #e10600;
    font-size: 34px;
    font-weight: 900;
    letter-spacing: 4px;
    line-height: .8;
}

.footer-sub {
    color: #fff;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 6px;
    margin-top: 10px;
}

.footer-brand p {
    max-width: 320px;
    margin-top: 25px;
    color: #666;
    line-height: 1.7;
    font-size: 14px;
}

/* COLUMNAS */

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-column h4 {
    margin: 0 0 12px;
    color: #fff;
    font-size: 11px;
    letter-spacing: 2px;
    font-weight: 900;
}

.footer-column a {
    color: #666;
    text-decoration: none;
    font-size: 13px;
    transition: color .2s, padding-left .2s;
}

.footer-column a:hover {
    color: #e10600;
    padding-left: 5px;
}

.footer-tagline {
    color: #444;
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 2px;
    line-height: 1.8;
    margin: 0;
}

/* FOOTER BOTTOM */

.footer-bottom {
    max-width: 1250px;
    margin: auto;
    padding: 22px 30px;
    border-top: 1px solid #181818;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    color: #444;
    font-size: 10px;
    letter-spacing: 1.5px;
}

/* =========================
   MERCH
   ========================= */

.product-image {
    height: 25%;
    background: #151515;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-image img {
    width: 250px;
    height: 250px;
    max-width: 100%;
    object-fit: contain;
    object-position: center;
    display: block;
    margin: auto;
}
cat >> assets/site.css <<'EOF'

/* =========================
   RESPONSIVE MÓVIL
   ========================= */

@media (max-width: 600px) {

    * {
        box-sizing: border-box;
    }

    html,
    body {
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
    }

    .page-container {
        width: 100%;
        max-width: 100%;
        padding: 0 15px;
    }

    /* HEADER */

    .header-inner {
        width: 100%;
        padding: 15px;
    }

    .brand {
        width: 100%;
        text-align: center;
    }

    .brand h1 {
        font-size: 28px;
    }

    .brand p {
        font-size: 11px;
    }

    .main-nav {
        width: 100%;
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 4px;
    }

    .main-nav a {
        font-size: 10px;
        padding: 8px 6px;
        white-space: nowrap;
    }

    /* CONTENIDO */

    .page-container img {
        max-width: 100%;
        height: auto;
    }

    /* MERCH */

    .product-image {
        width: 100%;
        height: 250px;
        min-height: 250px;
    }

    .product-image img {
        width: 250px;
        height: 250px;
        max-width: 100%;
        object-fit: contain;
    }

    /* GRIDS */

    .page-container > div,
    .products-grid,
    .product-grid {
        max-width: 100%;
    }

    /* TEXTOS */

    h1 {
        font-size: 30px;
        line-height: 1.15;
    }

    h2 {
        font-size: 24px;
        line-height: 1.2;
    }

    h3 {
        font-size: 20px;
    }

    p {
        line-height: 1.5;
    }

    /* FOOTER */

    .footer-inner {
        width: 100%;
        grid-template-columns: 1fr;
        gap: 25px;
        padding: 35px 20px;
    }

    .footer-bottom {
        width: 100%;
        flex-direction: column;
        gap: 10px;
        padding: 20px;
        text-align: center;
    }
}

@media (max-width: 380px) {

    .page-container {
        padding: 0 10px;
    }

    .brand h1 {
        font-size: 24px;
    }

    .main-nav a {
        font-size: 9px;
        padding: 7px 5px;
    }

    .product-image {
        height: 220px;
        min-height: 220px;
    }

    .product-image img {
        width: 220px;
        height: 220px;
    }

    h1 {
        font-size: 26px;
    }

    h2 {
        font-size: 22px;
    }
}

EOF
/* =========================
   MÓVIL
   ========================= */

@media (max-width: 900px) {

    .header-inner {
        min-height: auto;
        padding: 20px;
        flex-direction: column;
    }

    .brand {
        align-items: center;
    }

    .main-nav {
        justify-content: center;
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 600px) {

    .main-nav {
        gap: 2px;
    }

    .main-nav a {
        font-size: 11px;
        padding: 10px 8px;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        padding: 45px 25px;
    }

    .footer-bottom {
        flex-direction: column;
        padding: 20px 25px;
    }
}