:root {
    --accent: #23c9ff;
    --info-bg: #22282e;
    --img-bg: #191e26;
    --radius: 16px;
    --transition: .18s cubic-bezier(.4,0,.2,1);
    --font-main: 'Inter', 'Segoe UI', Arial, sans-serif;
}

.product-detail {
    padding: 46px 0 62px 0;
    min-height: 520px;
}
.product-detail__container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 14px;
    font-family: var(--font-main);
}
.product-detail__back {
    display: inline-block;
    color: var(--accent);
    font-size: 1.09rem;
    margin-bottom: 16px;
    border-radius: 8px;
    padding: 5px 15px 4px 10px;
    background: #1d2a384d;
    transition: background .18s, color .18s;
    font-weight: 500;
    text-decoration: none;
}
.product-detail__back:hover {
    background: #23c9ff22;
    color: #fff;
}
.product-detail__main {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    flex-wrap: wrap;
}
.product-detail__info {
    flex: 1 1 320px;
    min-width: 250px;
}
.product-detail__title {
    font-size: 1.54rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 9px;
    flex-wrap: wrap;
    letter-spacing: .5px;
}
.product-detail__addon {
    background: var(--accent);
    color: #19232b;
    font-size: .96em;
    font-weight: 700;
    padding: 3px 13px 2px 13px;
    border-radius: 14px;
    box-shadow: 0 2px 6px #23c9ff28;
    margin-left: 2px;
    opacity: .97;
    letter-spacing: .4px;
}
.product-detail__short {
    font-size: 1.07rem;
    color: #d8f5ff;
    margin-bottom: 17px;
    font-weight: 500;
    line-height: 1.4;
}
.product-detail__problems-title {
    font-size: 1.08em;
    font-weight: 700;
    color: #23c9ff;
    margin-bottom: 7px;
    letter-spacing: .1px;
}
.product-detail__problems-text {
    font-size: 1.01rem;
    color: #b3c4d7;
    line-height: 1.63;
}

.product-detail__images {
    flex: 1 1 270px;
    min-width: 230px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    align-items: flex-end;
}
.product-detail__imgwrap {
    width: 100%;
    border-radius: 13px;
    overflow: hidden;
    box-shadow: 0 4px 24px #0e2f3a21;
    background: var(--img-bg);
    aspect-ratio: 16/10;
    margin-bottom: 0;
}
.product-detail__imgwrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .18s cubic-bezier(.4,0,.2,1);
}
.product-detail__imgwrap:hover img {
    transform: scale(1.06);
}

@media (max-width: 900px) {
    .product-detail__main {
        flex-direction: column;
        gap: 23px;
    }
    .product-detail__images {
        align-items: flex-start;
        min-width: 0;
    }
}

@media (max-width: 600px) {
    .product-detail {
        padding: 25px 0 25px 0;
    }
    .product-detail__container {
        padding: 0 4vw;
    }
    .product-detail__title {
        font-size: 1.07rem;
    }
    .product-detail__short {
        font-size: .97rem;
    }
    .product-detail__problems-title,
    .product-detail__problems-text {
        font-size: .97em;
    }
}
.fade-in {
    opacity: 0;
    transform: translateY(20px) scale(.98);
    transition: opacity .4s, transform .4s;
}
.fade-in-visible {
    opacity: 1;
    transform: none;
}

.product-presentation {
    display: flex;
    flex-direction: column;
    gap: 38px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 28px 12px 50px 12px;
}
.presentation-slide {
    display: flex;
    gap: 32px;
    align-items: center;
}
.presentation-slide.rev {
    flex-direction: row-reverse;
}
.presentation-text {
    flex: 1 1 55%;
    font-size: 1.12rem;
    color: #a3edff;
}
.presentation-image {
    flex: 0 0 380px;
    max-width: 420px;
}
.presentation-image img {
    width: 100%;
    border-radius: 18px;
    box-shadow: 0 4px 32px #23c9ff18;
    cursor: pointer;
    transition: filter .14s;
}
.presentation-image img:hover {
    filter: brightness(1.13);
}
@media (max-width: 800px) {
    .presentation-slide,
    .presentation-slide.rev {
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
    }
    .presentation-image {
        max-width: 100%;
    }
}