.cooperation-page {
    padding: 20px 0;
    color: var(--text-primary);
}

.cooperation-page *,
.cooperation-page *::before,
.cooperation-page *::after {
    box-sizing: border-box;
}

.cooperation-page__header {
    max-width: 760px;
    margin: 0 auto 44px;
    text-align: center;
}

.cooperation-page__eyebrow,
.cooperation-section__eyebrow {
    margin: 0 0 6px;
    color: var(--theme-color, #1890ff);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .14em;
    line-height: 1.5;
}

.cooperation-page__title {
    margin: 0 0 12px;
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 600;
    line-height: 1.4;
}

.cooperation-page__intro {
    margin: 0;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
}

.cooperation-section {
    padding: 36px 0;
    border-top: 1px solid var(--border-primary);
}

.cooperation-section:first-of-type {
    border-top: 0;
}

.cooperation-section__heading {
    margin-bottom: 14px;
}

.cooperation-section__heading h2 {
    margin: 0 0 4px;
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 600;
    line-height: 1.45;
}

.cooperation-section__heading > p:last-child {
    margin: 0;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.cooperation-section__description {
    max-width: 780px;
    margin: 0;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

.cooperation-principles {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 22px;
}

.cooperation-principle {
    min-height: 116px;
    padding: 16px;
    border: 1px solid var(--border-secondary);
    border-radius: 8px;
    background: var(--bg-secondary);
}

.cooperation-principle h3 {
    margin: 0 0 7px;
    color: var(--theme-color, #1890ff);
    font-size: 15px;
    font-weight: 600;
}

.cooperation-principle p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.7;
}

.cooperation-principle--boundary {
    border-color: rgba(255, 167, 38, .45);
    background: rgba(255, 167, 38, .09);
}

.cooperation-principle--boundary h3 {
    color: #f57c00;
}

.cooperation-advertising {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 22px;
}

.cooperation-advertising__item {
    padding: 20px;
    border: 1px solid var(--border-secondary);
    border-radius: 8px;
    background: var(--bg-secondary);
}

.cooperation-advertising__item h3 {
    margin: 0 0 6px;
    color: var(--text-primary);
    font-size: 17px;
    font-weight: 600;
}

.cooperation-advertising__label {
    margin: 0 0 4px;
    color: var(--theme-color, #1890ff);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.cooperation-advertising__intro {
    margin: 0 0 4px;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.8;
}

.cooperation-advertising__item dl {
    margin: 0;
}

.cooperation-advertising__item dl > div {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 10px;
    padding: 9px 0;
    border-top: 1px dashed var(--border-secondary);
}

.cooperation-advertising__item dl > div:first-child {
    padding-top: 0;
    border-top: 0;
}

.cooperation-advertising__item dt {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
}

.cooperation-advertising__item dd {
    margin: 0;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.7;
}

.cooperation-section--contact {
    padding-right: 24px;
    padding-left: 24px;
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    background: var(--bg-secondary);
}

.cooperation-contact-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 20px;
}

.cooperation-contact-links__item {
    display: flex;
    min-width: 0;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 13px 15px;
    border: 1px solid var(--border-secondary);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-primary);
    text-decoration: none;
    transition: border-color .2s, color .2s;
}

.cooperation-contact-links__item:hover {
    border-color: var(--theme-color, #1890ff);
    color: var(--theme-color, #1890ff);
}

.cooperation-contact-links__item span {
    flex-shrink: 0;
    color: var(--text-muted);
    font-size: 12px;
}

.cooperation-contact-links__item strong {
    min-width: 0;
    overflow: hidden;
    font-size: 13px;
    font-weight: 500;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.cooperation-partners {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
    margin-top: 22px;
}

.cooperation-partner {
    display: flex;
    height: 74px;
    align-items: center;
    justify-content: center;
    padding: 12px;
    border: 1px solid var(--border-secondary);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-secondary);
    text-align: center;
    text-decoration: none;
    transition: border-color .2s, transform .2s;
}

.cooperation-partner:hover {
    border-color: var(--theme-color, #1890ff);
    transform: translateY(-2px);
}

.cooperation-partner img {
    display: block;
    max-width: 100%;
    max-height: 46px;
    object-fit: contain;
}

.cooperation-partner span {
    font-size: 13px;
    font-weight: 500;
}

.cooperation-page__notice {
    margin: 18px 0 0;
    padding: 12px 14px;
    border-left: 3px solid var(--border-primary);
    background: var(--bg-hover);
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.7;
}

@media (max-width: 900px) {
    .cooperation-principles {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .cooperation-page {
        padding-top: 8px;
    }

    .cooperation-page__header {
        margin-bottom: 28px;
        text-align: left;
    }

    .cooperation-page__title {
        font-size: 24px;
    }

    .cooperation-section {
        padding: 28px 0;
    }

    .cooperation-section__heading h2 {
        font-size: 21px;
    }

    .cooperation-principles,
    .cooperation-advertising,
    .cooperation-contact-links {
        grid-template-columns: 1fr;
    }

    .cooperation-principle {
        min-height: 0;
    }

    .cooperation-section--contact {
        padding-right: 16px;
        padding-left: 16px;
    }
}

@media (max-width: 420px) {
    .cooperation-advertising__item dl > div {
        grid-template-columns: 1fr;
        gap: 3px;
    }

    .cooperation-partners {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}