:root {
    --bg: #070a0d;
    --panel: #0d1318;
    --panel-2: #111a20;
    --line: #26333b;
    --text: #e7eef2;
    --muted: #94a5ae;
    --accent: #7cff8a;
    --accent-dim: rgba(124, 255, 138, .12);
    --danger: #ff6b6b;
    --shadow: 0 20px 60px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background:
        linear-gradient(rgba(124, 255, 138, .025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(124, 255, 138, .025) 1px, transparent 1px),
        radial-gradient(circle at top, #101a20 0, var(--bg) 45%);
    background-size: 32px 32px, 32px 32px, auto;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: inherit; }
img { display: block; max-width: 100%; }
code { color: var(--accent); }

.site-header,
.site-footer {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem clamp(1rem, 4vw, 4rem);
    border-color: var(--line);
    background: rgba(7, 10, 13, .88);
    backdrop-filter: blur(14px);
}

.site-header {
    position: sticky;
    z-index: 20;
    top: 0;
    border-bottom: 1px solid var(--line);
}

.site-footer {
    margin-top: 4rem;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font: 700 .72rem/1.2 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: .12em;
}

.brand {
    text-decoration: none;
    font: 800 .92rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: .12em;
}
.brand span { color: var(--accent); }
.status-line,
.back-link {
    color: var(--muted);
    text-decoration: none;
    font: 700 .72rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: .1em;
}
.status-dot {
    display: inline-block;
    width: .5rem;
    height: .5rem;
    margin-right: .4rem;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 14px var(--accent);
}

.shell {
    width: min(1200px, calc(100% - 2rem));
    margin: 0 auto;
}
.shell.narrow { width: min(720px, calc(100% - 2rem)); }

.hero { padding: clamp(3rem, 8vw, 7rem) 0 2.5rem; max-width: 760px; }
.hero h1,
.item-panel h1,
.success-panel h1 {
    margin: .2rem 0 1rem;
    font-size: clamp(2.2rem, 6vw, 5.3rem);
    line-height: .95;
    letter-spacing: -.055em;
}
.hero p:not(.eyebrow), .description, .success-panel p { color: #bac7cd; line-height: 1.75; }
.eyebrow {
    margin: 0;
    color: var(--accent);
    font: 800 .72rem/1.2 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: .18em;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
}
.product-card {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: linear-gradient(180deg, var(--panel-2), var(--panel));
    box-shadow: var(--shadow);
}
.product-card.is-sold { opacity: .72; }
.card-image {
    position: relative;
    display: block;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: #050708;
}
.card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .25s ease; }
.card-image:hover img { transform: scale(1.025); }
.image-placeholder { display: grid; place-items: center; min-height: 260px; color: #53616a; font: 800 .8rem ui-monospace, monospace; letter-spacing: .14em; }
.availability {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: .38rem .55rem;
    border: 1px solid currentColor;
    border-radius: 5px;
    font: 800 .64rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: .11em;
}
.card-image .availability { position: absolute; top: .8rem; right: .8rem; backdrop-filter: blur(10px); }
.availability.available { color: var(--accent); background: rgba(5, 20, 10, .82); }
.availability.sold { color: #c5cbd0; background: rgba(20, 20, 20, .82); }
.card-body { padding: 1.25rem; }
.card-meta { display: flex; gap: .6rem; color: var(--muted); font: 700 .67rem ui-monospace, monospace; text-transform: uppercase; }
.card-meta span + span::before { content: "/"; margin-right: .6rem; color: #4b5a62; }
.card-body h2 { margin: .75rem 0; font-size: 1.25rem; }
.card-body h2 a { text-decoration: none; }
.summary { min-height: 4.8em; color: var(--muted); line-height: 1.55; }
.card-footer { display: flex; align-items: end; justify-content: space-between; gap: 1rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.price { display: block; font-size: 1.25rem; }
.shipping { display: block; margin-top: .28rem; color: var(--muted); font-size: .76rem; }

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: .72rem 1rem;
    border: 1px solid var(--accent);
    border-radius: 7px;
    color: #061008;
    background: var(--accent);
    text-decoration: none;
    font: 900 .72rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: .08em;
}
.button.secondary { color: var(--accent); background: transparent; }

.item-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(340px, .7fr);
    gap: clamp(1.5rem, 4vw, 4rem);
    padding: clamp(2rem, 5vw, 4rem) 0;
}
.gallery { min-width: 0; }
.main-image-wrap {
    overflow: hidden;
    display: grid;
    place-items: center;
    min-height: 450px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #050708;
}
.main-image { width: 100%; max-height: 720px; object-fit: contain; }
.thumbnail-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(76px, 1fr)); gap: .65rem; margin-top: .75rem; }
.thumbnail { overflow: hidden; aspect-ratio: 1; padding: 0; border: 1px solid var(--line); border-radius: 7px; background: #050708; cursor: pointer; }
.thumbnail.active { outline: 2px solid var(--accent); outline-offset: 2px; }
.thumbnail img { width: 100%; height: 100%; object-fit: cover; }
.item-panel { align-self: start; position: sticky; top: 90px; }
.item-topline { display: flex; align-items: center; justify-content: space-between; gap: 1rem; color: var(--muted); font: 700 .68rem ui-monospace, monospace; }
.item-panel h1 { margin-top: 1.2rem; font-size: clamp(2rem, 5vw, 3.7rem); }
.item-price { margin: 0; font-size: 2rem; font-weight: 850; }
.shipping-line { margin: .25rem 0 1.5rem; color: var(--muted); }
.spec-list, .receipt-list { margin: 0; border-top: 1px solid var(--line); }
.spec-list div, .receipt-list div { display: grid; grid-template-columns: 120px 1fr; gap: 1rem; padding: .8rem 0; border-bottom: 1px solid var(--line); }
dt { color: var(--muted); }
dd { margin: 0; text-align: right; }
.checkout-box { margin-top: 1.5rem; padding: 1rem; border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,.025); }
.total-line { display: flex; justify-content: space-between; margin-bottom: 1rem; font-size: 1.05rem; }
.checkout-message { min-height: 1.4em; margin: .65rem 0 0; color: var(--muted); font-size: .82rem; }
.error-text { color: var(--danger); }
.fine-print { color: #71818a; font-size: .72rem; line-height: 1.45; }
.notice { margin-top: 1.5rem; padding: 1rem; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); }
.notice.error { border-color: rgba(255,107,107,.5); color: var(--danger); }
.content-panel, .empty-state, .success-panel { padding: clamp(1.5rem, 4vw, 3rem); border: 1px solid var(--line); border-radius: 14px; background: var(--panel); box-shadow: var(--shadow); }
.content-panel { margin-bottom: 4rem; }
.content-panel h2 { margin-top: 2rem; }
.feature-list { color: #bac7cd; line-height: 1.8; }
.empty-state { margin-top: 4rem; text-align: center; }
.success-panel { margin-top: 6rem; text-align: center; }
.success-icon { display: grid; place-items: center; width: 72px; height: 72px; margin: 0 auto 1rem; border: 2px solid var(--accent); border-radius: 50%; color: var(--accent); font-size: 2rem; box-shadow: 0 0 28px var(--accent-dim); }
.receipt-list { max-width: 520px; margin: 2rem auto; text-align: left; }
.error-panel .success-icon { color: var(--danger); border-color: var(--danger); }

@media (max-width: 920px) {
    .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .item-layout { grid-template-columns: 1fr; }
    .item-panel { position: static; }
}

@media (max-width: 620px) {
    .product-grid { grid-template-columns: 1fr; }
    .site-header { align-items: flex-start; }
    .status-line { display: none; }
    .card-footer { align-items: stretch; flex-direction: column; }
    .button.secondary { width: 100%; }
    .main-image-wrap { min-height: 280px; }
}