.kit-upgrade-box {
    margin: 30px 0;
    padding: 24px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(12, 76, 147, 0.08), rgba(0, 153, 204, 0.12));
    border: 1px solid rgba(12, 76, 147, 0.18);
    box-shadow: 0 14px 40px rgba(18, 42, 70, 0.08);
}

.kit-upgrade-box__header {
    margin-bottom: 18px;
}

.kit-upgrade-box__bottom {
    margin-top: 18px;
}

.kit-upgrade-box__eyebrow {
    display: inline-block;
    margin-bottom: 8px;
    padding: 5px 10px;
    border-radius: 999px;
    background: #0c4c93;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.kit-upgrade-box h3 {
    margin: 0 0 8px;
    font-size: 1.4rem;
}

.kit-upgrade-box p {
    margin: 0;
}

.kit-upgrade-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.kit-upgrade-card {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 92px;
    grid-template-rows: auto auto auto auto auto auto;
    column-gap: 16px;
    row-gap: 10px;
    padding: 20px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(12, 76, 147, 0.16);
    box-shadow: 0 8px 20px rgba(18, 42, 70, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.kit-upgrade-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(12, 76, 147, 0.08), rgba(12, 76, 147, 0));
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.kit-upgrade-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(18, 42, 70, 0.12);
    border-color: rgba(12, 76, 147, 0.28);
}

.kit-upgrade-card:hover::after {
    opacity: 1;
}

.kit-upgrade-card.is-selected {
    border-color: #0c4c93;
    box-shadow: 0 0 0 3px rgba(12, 76, 147, 0.14), 0 12px 28px rgba(18, 42, 70, 0.12);
    background: linear-gradient(180deg, rgba(240, 248, 255, 0.98), rgba(255, 255, 255, 0.98));
}

.kit-upgrade-card.is-selected::after {
    opacity: 1;
}

.kit-upgrade-card__badge {
    grid-column: 1;
    grid-row: 1;
    display: inline-flex;
    width: fit-content;
    max-width: 100%;
    padding: 4px 9px;
    border-radius: 999px;
    background: rgba(12, 76, 147, 0.1);
    color: #0c4c93;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.kit-upgrade-card__media {
    grid-column: 2;
    grid-row: 2 / span 5;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 84px;
    height: 84px;
    margin: 0;
    padding: 8px;
    border-radius: 14px;
    background: rgba(12, 76, 147, 0.06);
    border: 1px solid rgba(12, 76, 147, 0.12);
    overflow: hidden;
}

.kit-upgrade-card__media img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

.kit-upgrade-card__selected {
    display: none;
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 6px 10px;
    border-radius: 999px;
    background: #0c4c93;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.kit-upgrade-card.is-selected .kit-upgrade-card__selected {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.kit-upgrade-card.is-selected .kit-upgrade-card__selected::before {
    content: '✓';
}

.kit-upgrade-card.is-selected .kit-upgrade-select {
    background: #16324f !important;
    border-color: #16324f !important;
}

.kit-upgrade-card h4,
.kit-upgrade-card__price,
.kit-upgrade-card__subtext,
.kit-upgrade-card__actions,
.kit-upgrade-card__description {
    grid-column: 1;
    min-width: 0;
}

.kit-upgrade-card h4 {
    grid-row: 2;
    margin: 0;
    font-size: 1.15rem;
}

.kit-upgrade-card__price {
    grid-row: 3;
    margin-top: 0;
    margin-bottom: 10px;
    font-weight: 700;
    color: #16324f;
}

.kit-upgrade-card__subtext {
    grid-row: 4;
    margin-bottom: 16px;
    color: #5d6d7e;
    font-size: 0.95rem;
}

.kit-upgrade-card__actions {
    grid-row: 5;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.kit-upgrade-card__actions .button {
    margin: 0;
}

.kit-upgrade-select {
    background: #0c4c93 !important;
    color: #fff !important;
    border-color: #0c4c93 !important;
}

.kit-upgrade-learn {
    background: #fff !important;
    color: #0c4c93 !important;
    border-color: rgba(12, 76, 147, 0.3) !important;
}

.kit-upgrade-clear-wrap {
    margin-top: 14px;
    text-align: right;
}

.kit-upgrade-clear {
    background: transparent !important;
    color: #0c4c93 !important;
    border-color: rgba(12, 76, 147, 0.28) !important;
}

.kit-upgrade-card__description {
    grid-row: 6;
    display: none;
}

@media (max-width: 640px) {
    .kit-upgrade-box {
        padding: 18px;
        border-radius: 14px;
    }

    .kit-upgrade-grid {
        grid-template-columns: 1fr;
    }

    .kit-upgrade-card {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto auto auto auto;
        row-gap: 12px;
        padding: 16px;
    }

    .kit-upgrade-card__badge,
    .kit-upgrade-card__media,
    .kit-upgrade-card h4,
    .kit-upgrade-card__price,
    .kit-upgrade-card__subtext,
    .kit-upgrade-card__actions,
    .kit-upgrade-card__description {
        grid-column: 1;
    }

    .kit-upgrade-card__media {
        grid-row: 2;
        width: 100%;
        max-width: 110px;
        height: 110px;
        justify-self: center;
    }

    .kit-upgrade-card h4 {
        grid-row: 3;
    }

    .kit-upgrade-card__price {
        grid-row: 4;
    }

    .kit-upgrade-card__subtext {
        grid-row: 5;
    }

    .kit-upgrade-card__actions {
        grid-row: 6;
    }

    .kit-upgrade-card__description {
        grid-row: 7;
    }

    .kit-upgrade-card__actions {
        flex-direction: column;
    }

    .kit-upgrade-card__actions .button {
        width: 100%;
    }

    .kit-upgrade-clear-wrap {
        text-align: center;
    }

    .kit-upgrade-clear {
        width: 100%;
    }
}