.product-detail-page {
    padding: 1rem;
    background: linear-gradient(180deg, #eff4fb 0%, #f7f9fc 100%);
}

.product-qr-page {
    min-height: calc(100vh - var(--top-chrome-height));
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-detail-card {
    background: var(--color-surface);
    max-width: 1060px;
    margin: 0 auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    display: block;
}

.product-detail-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: 1rem;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(8, 35, 70, 0.14);
    background: #fff;
}

.product-detail-card h1 {
    font-size: 1.45rem;
    margin-bottom: 0.3rem;
}

.product-detail-meta {
    color: #4d5d72;
    margin-bottom: 0;
}

.unit-toggle {
    display: inline-flex;
    gap: 0.25rem;
    padding: 0.2rem 0.22rem;
    border: 1px solid #2f5f94;
    border-radius: 999px;
    background: #e7eff9;
    margin-bottom: 0;
}

.unit-toggle-btn {
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 0.28rem 0.68rem;
    background: transparent;
    color: #14385f;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
}

.unit-toggle-btn.is-active {
    background: var(--color-filter-active);
    border-color: var(--color-filter-active);
    color: #fff;
}

.product-detail-pricing {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 0.8rem;
}

.product-detail-photo-stack {
    display: grid;
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 0.9rem;
}

.product-detail-photo-frame {
    display: block;
    width: 100%;
    border: 1px solid rgba(12, 43, 78, 0.18);
    border-radius: 12px;
    overflow: hidden;
    background: linear-gradient(180deg, #ffffff 0%, #f5f9ff 100%);
}

.product-detail-photo-frame img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.product-detail-qr {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 144px;
    min-width: 144px;
    height: 144px;
    border: 1px solid rgba(12, 43, 78, 0.18);
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
    padding: 0.6rem;
    margin-bottom: 1rem;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.product-detail-qr a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.product-detail-qr img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.product-detail-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.7rem;
    margin-bottom: 0;
}

.product-detail-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--control-height);
    background: var(--color-primary);
    color: #fff;
    border: 1px solid var(--color-primary);
    padding: 0.72rem 1.1rem;
    border-radius: var(--radius-pill);
    text-decoration: none;
    font-weight: 600;
    line-height: 1.15;
    text-align: center;
}

button.product-detail-cta,
button.product-detail-secondary {
    font: inherit;
    cursor: pointer;
}

.product-detail-cta:visited {
    color: #fff;
}

.product-detail-cta:hover {
    background: #fff;
    color: var(--color-primary);
}

.product-detail-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--control-height);
    background-color: #f7f9fc;
    color: #1f3148;
    border: 1px solid #c7d2df;
    padding: 0.72rem 1.1rem;
    border-radius: var(--radius-pill);
    text-decoration: none;
    font-weight: 600;
    line-height: 1.15;
    text-align: center;
}

.product-detail-secondary:hover {
    background-color: var(--color-highlight);
}

.product-detail-cta.is-adding {
    opacity: 0.75;
    pointer-events: none;
}

.product-detail-secondary.is-adding {
    opacity: 0.75;
    pointer-events: none;
}

.product-detail-cta.is-added {
    background-color: #1f7a3f;
    border-color: #1f7a3f;
    color: #fff;
    animation: product-detail-added-pop 0.35s ease;
}

.product-detail-secondary.is-added {
    background-color: #1f7a3f;
    border-color: #1f7a3f;
    color: #fff;
    animation: product-detail-added-pop 0.35s ease;
}

@keyframes product-detail-added-pop {
    0% {
        transform: scale(1);
    }
    45% {
        transform: scale(1.08);
    }
    100% {
        transform: scale(1);
    }
}

.product-detail-specs {
    display: grid;
    grid-template-columns: minmax(160px, 220px) 1fr;
    gap: 0.35rem 0.7rem;
}

.product-detail-section {
    padding-top: 0;
    margin-top: 0.8rem;
}

.product-detail-section h2 {
    margin-top: 0;
    margin-bottom: 0.55rem;
    font-size: 1rem;
    color: #1e2b40;
}

.product-detail-bento {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 0.7rem;
}

.product-detail-panel {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
}

.product-detail-panel--summary {
    background: #f2f7ff;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.product-detail-panel--downloads {
    background: #f6fbf4;
}

.product-detail-panel--compatibility {
    background: #fff9f0;
}

.product-detail-panel--specs {
    background: #fcfdff;
}

.product-qr-card {
    width: min(960px, 100%);
}

.product-qr-panel {
    display: grid;
    grid-template-columns: minmax(280px, 400px) 1fr;
    gap: 1.25rem;
    align-items: center;
    background: #f8fbff;
}

.product-detail-qr--standalone {
    width: min(400px, 72vw);
    height: min(400px, 72vw);
    margin: 0;
    justify-self: center;
}

.product-qr-meta {
    display: grid;
    gap: 0.65rem;
    color: #23384f;
    line-height: 1.45;
}

.product-download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.7rem;
}

.product-download-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface-alt);
    padding: 0.7rem 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    text-decoration: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.product-download-item:hover {
    border-color: rgba(17, 78, 141, 0.4);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.product-download-thumb {
    height: 74px;
    border-radius: 6px;
    background: linear-gradient(135deg, #dcecff 0%, #f3f8ff 100%);
    border: 1px solid rgba(17, 78, 141, 0.16);
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    padding: 0.35rem 0.45rem;
    color: #1b4f85;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.product-download-thumb::after {
    content: attr(data-format);
}

.product-download-title {
    font-weight: 600;
    color: #1e2b40;
}

.product-download-format {
    font-size: 0.78rem;
    color: #54657f;
}

.product-download-link {
    display: inline-flex;
    align-self: flex-start;
    margin-top: 0.25rem;
    padding: 0.28rem 0.62rem;
    border-radius: 999px;
    background-color: var(--color-primary);
    border: 1px solid var(--color-primary);
    color: #fff;
    font-weight: 600;
    font-size: 0.78rem;
}

.product-download-item:hover .product-download-link {
    background-color: #fff;
    color: var(--color-primary);
}

.product-compatibility-groups {
    display: grid;
    gap: 0.9rem;
}

.product-compatibility-group h3 {
    margin: 0 0 0.5rem;
    font-size: 0.96rem;
    color: #3f2f17;
}

.product-compatibility-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.7rem;
}

.product-compatibility-card {
    display: grid;
    gap: 0.32rem;
    padding: 0.78rem 0.84rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(125, 84, 22, 0.16);
    background: linear-gradient(180deg, #fffdf8 0%, #fff6e8 100%);
    text-decoration: none;
    color: #21344b;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.product-compatibility-card:hover {
    transform: translateY(-1px);
    border-color: rgba(125, 84, 22, 0.32);
    box-shadow: 0 8px 18px rgba(66, 48, 16, 0.08);
}

.product-compatibility-topline {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.product-compatibility-category {
    color: #8a5a12;
    font-weight: 700;
}

.product-compatibility-brand {
    color: #6a7688;
}

.product-compatibility-title {
    font-weight: 700;
    color: #1e2b40;
}

.product-compatibility-sku {
    font-size: 0.8rem;
    color: #41526b;
}

.product-compatibility-note {
    font-size: 0.82rem;
    color: #5b4a2e;
    line-height: 1.35;
}

.product-detail-specs dt {
    font-weight: 600;
    padding-inline: 0.35rem;
}

.product-detail-specs dd {
    margin: 0;
    color: #2b384a;
    padding-inline: 0.35rem;
}

@media (max-width: 640px) {
    .product-detail-hero {
        flex-direction: column;
        align-items: flex-start;
    }

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

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

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

    .product-detail-qr {
        width: 132px;
        min-width: 132px;
        height: 132px;
    }

    .product-detail-actions {
        width: 100%;
        flex-direction: column;
    }

    .product-detail-actions > a {
        width: 100%;
    }
}