/* =============================================================
   Home — Partners（合作伙伴 · 一行无缝轮播）
   决策：限高槽位 + marquee，见设计文档 §16.85
   辨识度：默认深灰高对比；悬停还原彩色
   尺寸：槽位 / logo / 间距一律相对单位（rem · clamp），勿写死 px 高度
============================================================= */
.home-partners {
    --section-overlay: transparent;
    /* 槽位与 logo：随视口缩放，保持可辨认下限 */
    --partners-logo-max-h: clamp(1.875rem, 2.8vw, 2.75rem);   /* ~30–44px */
    --partners-logo-max-w: clamp(5.5rem, 12vw, 9rem);           /* ~88–144px */
    --partners-slot-h: clamp(2.75rem, 4vw, 3.75rem);            /* ~44–60px */
    --partners-gap: clamp(1.75rem, 4vw, 3rem);
    --partners-duration: 45s;
    --partners-logo-muted: 0.88;   /* 默认可见度：勿过淡 */
    --partners-logo-hover: 1;
}

.home-partners .nd-section__inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: clamp(2.75rem, 5vw, 4rem) clamp(1.25rem, 3vw, 1.5rem) clamp(3rem, 5.5vw, 4.25rem);
}

.home-partners__head {
    margin-bottom: clamp(1.75rem, 3.5vw, 2.5rem);
    text-align: center;
}

.home-partners__title {
    margin: 0 0 0.5rem;
    font-family: var(--font-serif);
    font-size: clamp(1.375rem, 3vw, 1.75rem);
    font-weight: 700;
    color: var(--color-primary);
}

.home-partners__subtitle {
    margin: 0 auto;
    max-width: 36rem;
    font-size: clamp(0.875rem, 1.5vw, 0.9375rem);
    line-height: 1.55;
    color: var(--color-text-muted);
}

/* —— Marquee 视口：两侧轻淡出（勿切太多，避免「半截品牌」抢眼） —— */
.home-partners__marquee {
    margin-inline: calc(-1 * clamp(0.25rem, 1vw, 0.5rem));
}

.home-partners__viewport {
    overflow: hidden;
    padding-block: 0.25rem;
    mask-image: linear-gradient(
        90deg,
        transparent 0,
        #000 2.5%,
        #000 97.5%,
        transparent 100%
    );
    -webkit-mask-image: linear-gradient(
        90deg,
        transparent 0,
        #000 2.5%,
        #000 97.5%,
        transparent 100%
    );
}

.home-partners__track {
    display: flex;
    width: max-content;
    gap: 0;
    animation: home-partners-marquee var(--partners-duration) linear infinite;
    will-change: transform;
}

.home-partners__marquee:hover .home-partners__track,
.home-partners__marquee:focus-within .home-partners__track {
    animation-play-state: paused;
}

.home-partners__list {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    gap: 0;
    margin: 0;
    padding: 0.5rem var(--partners-gap) 0.5rem 0;
    list-style: none;
}

/* 限高限宽槽位：不同比例 logo 统一 contain，视觉权重更接近 */
.home-partners__item {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    box-sizing: border-box;
    height: var(--partners-slot-h);
    width: var(--partners-logo-max-w);
    padding-inline: 0.35rem;
}

.home-partners__logo {
    display: block;
    max-width: 100%;
    max-height: var(--partners-logo-max-h);
    width: auto;
    height: auto;
    object-fit: contain;
    /* 灰度 + 略提对比：浅底上仍可读；悬停去灰上色 */
    filter: grayscale(1) contrast(1.2);
    opacity: var(--partners-logo-muted);
    transition: filter 0.28s ease, opacity 0.28s ease, transform 0.28s ease;
}

.home-partners__item:hover .home-partners__logo,
.home-partners__item:focus-within .home-partners__logo {
    filter: grayscale(0) contrast(1);
    opacity: var(--partners-logo-hover);
    transform: scale(1.04);
}

.home-partners__name {
    font-size: clamp(0.75rem, 1.4vw, 0.8125rem);
    font-weight: 600;
    letter-spacing: 0.06em;
    white-space: nowrap;
    color: var(--color-text);
    opacity: 0.72;
}

@keyframes home-partners-marquee {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
    .home-partners__track {
        animation: none;
        width: 100%;
        justify-content: flex-start;
        will-change: auto;
    }

    .home-partners__viewport {
        overflow-x: auto;
        mask-image: none;
        -webkit-mask-image: none;
        -webkit-overflow-scrolling: touch;
    }

    .home-partners__list[aria-hidden="true"] {
        display: none;
    }

    .home-partners__list {
        padding-right: 0;
    }

    .home-partners__item:hover .home-partners__logo,
    .home-partners__item:focus-within .home-partners__logo {
        transform: none;
    }
}

@media (max-width: 576px) {
    .home-partners {
        --partners-logo-max-h: clamp(1.5rem, 5.5vw, 2rem);
        --partners-logo-max-w: clamp(4.5rem, 28vw, 6.5rem);
        --partners-slot-h: clamp(2.25rem, 8vw, 3rem);
        --partners-gap: clamp(1.25rem, 5vw, 2rem);
        --partners-duration: 38s;
    }
}