:root {
    --product-red: #bc1721;
    --product-ink: #171717;
    --product-paper: #f4f2ed;
    --product-line: rgba(23, 23, 23, 0.16);
}

.xiniu-product-body {
    background: var(--product-paper);
    color: var(--product-ink);
}

.xiniu-product-body #content > .ast-container {
    display: block;
    width: 100%;
    max-width: none;
    padding: 0;
}

.product-detail {
    padding-top: var(--header-height);
    overflow: hidden;
    background: var(--product-paper);
}

.product-detail__shell {
    width: min(1240px, calc(100% - 80px));
    margin-inline: auto;
}

.product-detail__hero {
    position: relative;
    padding: 54px 0 0;
    background: #f8f7f3;
    border-bottom: 1px solid var(--product-line);
}

.product-detail__hero::before {
    position: absolute;
    content: "";
    inset: 0 auto 0 0;
    width: max(20px, calc((100vw - 1240px) / 2));
    background: var(--product-red);
}

.product-detail__hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.94fr) minmax(420px, 0.86fr);
    align-items: center;
    gap: clamp(50px, 7vw, 110px);
}

.product-detail__hero-copy {
    padding: 36px 0 62px 34px;
}

.product-detail__breadcrumb {
    display: flex;
    align-items: center;
    gap: 11px;
    margin-bottom: 64px;
    color: #77736e;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.product-detail__breadcrumb a {
    color: var(--product-red);
}

.product-detail__eyebrow,
.product-detail__kicker {
    margin: 0 0 20px;
    color: var(--product-red);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.26em;
    text-transform: uppercase;
}

.product-detail__hero h1 {
    max-width: 720px;
    margin: 0;
    color: var(--product-ink);
    font-family: var(--font-serif);
    font-size: clamp(52px, 5.7vw, 88px);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.065em;
}

.product-detail__subtitle {
    margin: 28px 0 0;
    color: var(--product-red);
    font-size: 15px;
    font-weight: 800;
    letter-spacing: 0.04em;
}

.product-detail__summary {
    max-width: 640px;
    margin: 22px 0 0;
    color: #68645f;
    font-size: 14px;
    line-height: 1.9;
}

.product-detail__hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 34px;
}

.product-detail__button {
    min-height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 24px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.05em;
    transition: transform 0.28s var(--ease), color 0.28s ease, background 0.28s ease;
}

.product-detail__button:hover {
    transform: translateY(-2px);
}

.product-detail__button--primary {
    background: var(--product-red);
    color: #fff;
}

.product-detail__button--ghost {
    border-color: rgba(23, 23, 23, 0.28);
    color: var(--product-ink);
}

.product-detail__visual {
    position: relative;
    min-height: 610px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    overflow: hidden;
    background: #ebe9e3;
    border-radius: 32px 32px 0 0;
}

.product-detail__visual::before {
    position: absolute;
    content: "";
    width: 450px;
    height: 450px;
    border-radius: 50%;
    background: var(--product-red);
    transform: translate(16%, 5%);
}

.product-detail__visual-ring {
    position: absolute;
    width: 520px;
    height: 520px;
    border: 1px solid rgba(23, 23, 23, 0.18);
    border-radius: 50%;
    transform: translate(16%, 5%);
}

.product-detail__visual-index {
    position: absolute;
    top: 30px;
    left: 34px;
    color: rgba(23, 23, 23, 0.2);
    font: 800 80px/1 Arial, sans-serif;
    letter-spacing: -0.08em;
}

.product-detail__packshot {
    position: relative;
    z-index: 2;
    width: min(95%, 580px);
    height: 570px;
    object-fit: contain;
    filter: drop-shadow(0 28px 28px rgba(35, 13, 11, 0.2));
    transform: translateY(12px);
}

.product-detail__visual figcaption {
    position: absolute;
    z-index: 3;
    right: 24px;
    bottom: 20px;
    color: rgba(255, 255, 255, 0.92);
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.12em;
    writing-mode: vertical-rl;
}

.product-detail__specs {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin-top: 0;
    border-inline: 1px solid var(--product-line);
}

.product-detail__specs > div {
    min-height: 112px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 10px;
    padding: 22px 24px;
    border-right: 1px solid var(--product-line);
}

.product-detail__specs > div:last-child {
    border-right: 0;
}

.product-detail__specs dt {
    color: #8a8680;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.product-detail__specs dd {
    margin: 0;
    color: var(--product-ink);
    font-family: var(--font-serif);
    font-size: clamp(16px, 1.55vw, 22px);
    font-weight: 700;
    line-height: 1.35;
}

.product-detail__section {
    padding: 112px 0;
}

.product-detail__section-grid,
.product-detail__notes-grid {
    display: grid;
    grid-template-columns: 160px minmax(0, 1fr);
    gap: clamp(50px, 8vw, 120px);
}

.product-detail__section-label {
    padding-top: 8px;
    border-top: 1px solid var(--product-line);
}

.product-detail__section-label span {
    display: block;
    color: var(--product-red);
    font: 800 42px/1 Arial, sans-serif;
    letter-spacing: -0.06em;
}

.product-detail__section-label p {
    margin: 14px 0 0;
    color: #7b7771;
    font-size: 9px;
    font-weight: 800;
    line-height: 1.6;
    letter-spacing: 0.15em;
}

.product-detail__section-content h2,
.product-detail__construction h2,
.product-detail__notes h2,
.product-detail__application h2,
.product-detail__closing h2 {
    margin: 0;
    font-family: var(--font-serif);
    font-weight: 800;
    letter-spacing: -0.055em;
}

.product-detail__section-content h2 {
    max-width: 850px;
    font-size: clamp(44px, 6vw, 82px);
    line-height: 1.06;
}

.product-detail__section-content h2 em {
    color: var(--product-red);
    font-style: normal;
}

.product-detail__feature-grid {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    margin: 64px 0 0;
    padding: 1px;
    background: rgba(23, 23, 23, 0.14);
}

.product-detail__feature-grid li {
    min-height: 148px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 24px;
    background: var(--product-paper);
}

.product-detail__feature-grid span {
    color: var(--product-red);
    font-size: 10px;
    font-weight: 900;
}

.product-detail__feature-grid strong {
    max-width: 170px;
    font-family: var(--font-serif);
    font-size: 22px;
    line-height: 1.35;
}

.product-detail__application {
    padding: 92px 0;
    background: var(--product-red);
    color: #fff;
}

.product-detail__application-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(380px, 1.08fr);
    align-items: end;
    gap: clamp(60px, 10vw, 150px);
}

.product-detail__application .product-detail__kicker {
    color: rgba(255, 255, 255, 0.64);
}

.product-detail__application h2 {
    color: #fff;
    font-size: clamp(42px, 5vw, 72px);
    line-height: 1.12;
}

.product-detail__application-grid > p {
    margin: 0;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.42);
    color: rgba(255, 255, 255, 0.88);
    font-size: 15px;
    line-height: 2;
}

.product-detail__construction {
    background: #191919;
    color: #f8f7f3;
}

.product-detail__construction-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
    padding-bottom: 38px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.product-detail__construction h2 {
    max-width: 760px;
    color: #f8f7f3;
    font-size: clamp(44px, 5.5vw, 76px);
    line-height: 1.08;
}

.product-detail__construction-head > span {
    color: rgba(255, 255, 255, 0.46);
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0.16em;
}

.product-detail__method-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-left: 1px solid rgba(255, 255, 255, 0.17);
}

.product-detail__method-grid article {
    position: relative;
    padding: 46px 46px 52px;
    border-right: 1px solid rgba(255, 255, 255, 0.17);
    border-bottom: 1px solid rgba(255, 255, 255, 0.17);
}

.product-detail__method-grid article > span {
    color: var(--product-red);
    font: 800 12px/1 Arial, sans-serif;
}

.product-detail__method-grid h3 {
    margin: 68px 0 24px;
    color: #fff;
    font-family: var(--font-serif);
    font-size: 31px;
    line-height: 1.25;
}

.product-detail__method-grid article > div {
    color: rgba(255, 255, 255, 0.62);
    font-size: 13px;
    line-height: 1.95;
}

.product-detail__method-grid p {
    margin: 0 0 1.1em;
}

.product-detail__method-wide {
    grid-column: 1 / -1;
}

.product-detail__notes {
    background: #efede8;
}

.product-detail__notes h2 {
    max-width: 820px;
    font-size: clamp(42px, 5.4vw, 74px);
    line-height: 1.08;
}

.product-detail__notes-content > article {
    display: grid;
    grid-template-columns: minmax(160px, 0.32fr) minmax(0, 1fr);
    gap: 34px;
    padding: 34px 0;
    border-bottom: 1px solid var(--product-line);
}

.product-detail__notes-content > article:first-of-type {
    margin-top: 44px;
    border-top: 1px solid var(--product-line);
}

.product-detail__notes-content h3 {
    margin: 0;
    font-family: var(--font-serif);
    font-size: 23px;
}

.product-detail__notes-content article > p,
.product-detail__notes-content article > div {
    margin: 0;
    color: #6d6964;
    font-size: 13px;
    line-height: 1.9;
}

.product-detail__notes-content article > div p {
    margin: 0 0 1em;
}

.product-detail__closing {
    padding: 98px 0 110px;
    background: #202020;
    color: #fff;
}

.product-detail__closing p {
    margin: 0 0 34px;
    color: var(--product-red);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.2em;
}

.product-detail__closing h2 {
    max-width: 980px;
    color: #fff;
    font-size: clamp(44px, 6vw, 86px);
    line-height: 1.06;
}

.product-detail__closing > div > div {
    margin-top: 42px;
}

.product-detail__button--light {
    background: #f8f7f3;
    color: #191919;
}

@media (max-width: 1024px) {
    .product-detail__shell {
        width: min(100% - 48px, 900px);
    }

    .product-detail__hero-grid {
        grid-template-columns: minmax(0, 1fr) minmax(340px, 0.78fr);
        gap: 36px;
    }

    .product-detail__hero-copy {
        padding-left: 18px;
    }

    .product-detail__visual {
        min-height: 540px;
    }

    .product-detail__packshot {
        height: 490px;
    }

    .product-detail__specs {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .product-detail__specs > div:nth-child(3) {
        border-right: 0;
    }

    .product-detail__specs > div:nth-child(n + 4) {
        border-top: 1px solid var(--product-line);
    }

    .product-detail__section-grid,
    .product-detail__notes-grid {
        grid-template-columns: 110px minmax(0, 1fr);
        gap: 46px;
    }

    .product-detail__application-grid {
        gap: 60px;
    }
}

@media (max-width: 767px) {
    .product-detail__shell {
        width: calc(100% - 32px);
    }

    .product-detail__hero {
        padding-top: 32px;
    }

    .product-detail__hero::before {
        width: 8px;
    }

    .product-detail__hero-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .product-detail__hero-copy {
        padding: 20px 10px 46px 18px;
    }

    .product-detail__breadcrumb {
        margin-bottom: 42px;
    }

    .product-detail__hero h1 {
        font-size: clamp(45px, 14vw, 64px);
    }

    .product-detail__visual {
        min-height: 440px;
        border-radius: 24px 24px 0 0;
    }

    .product-detail__visual::before {
        width: 330px;
        height: 330px;
    }

    .product-detail__visual-ring {
        width: 370px;
        height: 370px;
    }

    .product-detail__packshot {
        width: 102%;
        height: 420px;
    }

    .product-detail__specs {
        width: 100%;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        border-inline: 0;
    }

    .product-detail__specs > div,
    .product-detail__specs > div:nth-child(3) {
        min-height: 96px;
        padding: 18px 16px;
        border-right: 1px solid var(--product-line);
        border-top: 1px solid var(--product-line);
    }

    .product-detail__specs > div:nth-child(even) {
        border-right: 0;
    }

    .product-detail__section {
        padding: 78px 0;
    }

    .product-detail__section-grid,
    .product-detail__notes-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .product-detail__section-label {
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
    }

    .product-detail__section-label p {
        margin: 0;
        text-align: right;
    }

    .product-detail__feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        margin-top: 42px;
    }

    .product-detail__feature-grid li {
        min-height: 130px;
        padding: 20px;
    }

    .product-detail__feature-grid strong {
        font-size: 18px;
    }

    .product-detail__application {
        padding: 72px 0;
    }

    .product-detail__application-grid {
        grid-template-columns: 1fr;
        gap: 42px;
    }

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

    .product-detail__method-wide {
        grid-column: auto;
    }

    .product-detail__method-grid article {
        padding: 36px 26px 40px;
    }

    .product-detail__method-grid h3 {
        margin-top: 44px;
    }

    .product-detail__construction-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .product-detail__notes-content > article {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .product-detail__closing {
        padding: 76px 0 88px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .product-detail__button {
        transition: none;
    }
}