:root {
    --product-bg: #07120d;
    --product-panel: #0d2118;
    --product-border: #294b38;
    --product-text: #f0f9f3;
    --product-muted: #a9c0b1;
    --product-accent: #57f28f;
    --product-accent-dark: #062012;
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
}

body {
    margin: 0;
    background:
        radial-gradient(
            circle at top right,
            rgba(87, 242, 143, 0.10),
            transparent 34rem
        ),
        var(--product-bg);
    color: var(--product-text);
    font: 15px/1.6 system-ui, -apple-system, sans-serif;
}

a {
    color: inherit;
}

.product-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    min-height: 72px;
    padding: 14px max(18px, calc((100% - 1180px) / 2));
    border-bottom: 1px solid var(--product-border);
    background: rgba(7, 18, 13, 0.92);
}

.product-brand,
.product-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.product-brand {
    text-decoration: none;
    font-weight: 900;
}

.product-mark {
    display: grid;
    width: 40px;
    height: 40px;
    place-items: center;
    border-radius: 13px;
    background: var(--product-accent);
    color: var(--product-accent-dark);
    font-weight: 1000;
}

.product-nav a {
    color: var(--product-muted);
    text-decoration: none;
    font-weight: 750;
}

.product-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 34px auto 90px;
}

.product-eyebrow {
    margin: 0;
    color: var(--product-accent);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.product-title {
    margin: 5px 0 8px;
    font-size: clamp(2rem, 5vw, 3.8rem);
}

.product-intro {
    max-width: 720px;
    color: var(--product-muted);
}

.catalogue-grid {
    display: grid;
    grid-template-columns:
        repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 28px;
}

.catalogue-card {
    overflow: hidden;
    border: 1px solid var(--product-border);
    border-radius: 20px;
    background: var(--product-panel);
}

.catalogue-image {
    display: grid;
    width: 100%;
    aspect-ratio: 1;
    place-items: center;
    background: #102a1e;
    object-fit: cover;
}

.catalogue-body {
    padding: 18px;
}

.catalogue-body h2 {
    margin: 7px 0;
}

.product-price {
    color: var(--product-accent);
    font-size: 1.4rem;
    font-weight: 950;
}

.compare-price {
    margin-left: 8px;
    color: var(--product-muted);
    text-decoration: line-through;
}

.product-meta {
    color: var(--product-muted);
}

.product-button {
    display: inline-block;
    margin-top: 8px;
    padding: 10px 14px;
    border-radius: 11px;
    background: var(--product-accent);
    color: var(--product-accent-dark);
    text-decoration: none;
    font-weight: 900;
}

.product-detail {
    display: grid;
    grid-template-columns:
        minmax(0, 1.1fr)
        minmax(320px, 0.9fr);
    gap: 26px;
}

.product-gallery {
    display: grid;
    grid-template-columns:
        repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.product-gallery img {
    width: 100%;
    aspect-ratio: 1;
    border: 1px solid var(--product-border);
    border-radius: 18px;
    object-fit: cover;
}

.product-summary,
.product-description,
.empty-products,
.product-unavailable {
    border: 1px solid var(--product-border);
    border-radius: 22px;
    background: var(--product-panel);
}

.product-summary {
    align-self: start;
    padding: 24px;
}

.product-summary h1 {
    margin: 8px 0;
    font-size: clamp(2rem, 5vw, 3.6rem);
    line-height: 1.05;
}

.product-fact {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 11px 0;
    border-bottom: 1px solid var(--product-border);
}

.product-fact span {
    color: var(--product-muted);
}

.product-description {
    margin-top: 24px;
    padding: 24px;
}

.commerce-notice {
    margin-top: 20px;
    padding: 15px;
    border: 1px solid var(--product-border);
    border-radius: 14px;
    color: var(--product-muted);
}

.empty-products,
.product-unavailable {
    margin-top: 25px;
    padding: 42px 24px;
    text-align: center;
}

.product-unavailable {
    width: min(760px, calc(100% - 32px));
    margin: 100px auto;
}

.product-footer {
    padding: 30px 18px;
    border-top: 1px solid var(--product-border);
    color: var(--product-muted);
    text-align: center;
}

@media (max-width: 860px) {
    .catalogue-grid {
        grid-template-columns: 1fr 1fr;
    }

    .product-detail {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .product-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .catalogue-grid,
    .product-gallery {
        grid-template-columns: 1fr;
    }
}

/* STAGE 13 BUYER CART */
.cart-purchase-form {
    margin-top: 20px;
    padding: 16px;
    border: 1px solid var(--product-border);
    border-radius: 14px;
    background: rgba(7, 18, 13, 0.72);
}

.cart-purchase-form label {
    display: block;
    color: var(--product-muted);
    font-weight: 800;
}

.cart-purchase-form input {
    width: 90px;
    margin-top: 8px;
    padding: 10px;
    border: 1px solid var(--product-border);
    border-radius: 10px;
    background: var(--product-bg);
    color: var(--product-text);
    font: inherit;
}

.cart-purchase-form button {
    display: block;
    width: 100%;
    margin-top: 12px;
    padding: 12px 15px;
    border: 0;
    border-radius: 11px;
    background: var(--product-accent);
    color: var(--product-accent-dark);
    cursor: pointer;
    font: inherit;
    font-weight: 950;
}

.cart-signin-link {
    display: block;
    margin-top: 20px;
    padding: 12px 15px;
    border-radius: 11px;
    background: var(--product-accent);
    color: var(--product-accent-dark);
    text-align: center;
    text-decoration: none;
    font-weight: 950;
}