/* ==================== Partner页面样式 ==================== */
:root {
    --partner-design-width: 1920px;
}

.partner-page {
    background: var(--bg-white);
    height: 100%;
    max-height: 100vh;
    overflow: hidden !important;
}

.main-content {
    position: relative;
    width: 100%;
    /* 固定高度，单视窗显示 */
    height: 100%;
    overflow: hidden !important;
    z-index: 1;
    max-width: calc(120rem); /* 1920px */
    margin-left: auto;
    margin-right: auto;
}

/* ==================== PARTNER标题 ==================== */
.page-title {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(9rem); /* 128px - 下沉位置 */
    margin-left: auto;
    margin-right: auto;
    width: fit-content;
    font-family: var(--font-family);
    font-size: calc(3rem); /* 48px */
    line-height: calc(3.5rem); /* 56px */
    letter-spacing: calc(0.12rem); /* 1.92px */
    text-transform: uppercase;
    text-align: center;
    color: var(--primary-black);
    margin: 0 auto;
    font-weight: 700;
    animation: fadeIn 0.8s ease-out 0.2s both;
    white-space: nowrap;
    z-index: 2;
}

/* ==================== 合作伙伴轮播容器 ==================== */
.partner-carousel-wrapper {
    position: absolute;
    left: calc(18rem); /* 与第一个卡片左边对齐 */
    top: calc(18rem); /* 与第一行卡片顶部对齐 */
    width: calc(83rem); /* 覆盖所有4列卡片 */
    height: calc(29.5rem); /* 显示两行: 13.5rem * 2 + 2.5rem间距 */
    overflow: hidden;
    z-index: 1;
}

/* ==================== 合作伙伴图片网格 (4×N) ==================== */
.partner-grid {
    position: relative;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, calc(20rem));
    gap: calc(2.5rem) calc(1rem);
    transition: transform 0.5s ease;
    z-index: 1;
}

/* ==================== 滚动箭头按钮 ==================== */
.partner-scroll-btn {
    position: absolute;
    left: calc(58.5rem); /* 居中于网格区域 (18rem + 83rem/2) */
    width: calc(2rem); /* 32px */
    height: calc(2rem); /* 32px */
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: all 0.3s ease;
}

.partner-scroll-btn img {
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.partner-scroll-btn.scroll-up {
    top: calc(15rem); /* 图片区域上方 (18rem - 3rem) */
}

.partner-scroll-btn.scroll-up img {
    transform: rotate(-90deg); /* 箭头向上 */
}

.partner-scroll-btn.scroll-down {
    top: calc(48.5rem); /* 两行卡片下方 (18rem + 29.5rem + 1rem) */
}

.partner-scroll-btn.scroll-down img {
    transform: rotate(90deg); /* 箭头向下 */
}

.partner-scroll-btn:hover:not(:disabled) img {
    opacity: 0.7;
}

.partner-scroll-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

/* ==================== 空状态提示 ==================== */
.partner-empty-message,
.partner-loading-message {
    grid-column: 1 / -1;
    text-align: center;
    padding: calc(5rem) 0;
    font-family: var(--font-family);
    font-size: calc(1.25rem); /* 20px */
    color: var(--primary-black);
    white-space: nowrap;
    opacity: 0.6;
}

/* ==================== 通用图片项样式 ==================== */
.partner-item {
    position: relative;
    width: calc(20rem); /* 320px */
    height: calc(13.5rem); /* 216px */
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 2;
}

.partner-item:hover {
    transform: scale(1.02);
    box-shadow: 0 calc(0.625rem) calc(1.875rem) rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.partner-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ==================== 网格项动画 ==================== */
.partner-item:nth-child(1) { animation: fadeInScale 0.6s ease-out 0.3s both; }
.partner-item:nth-child(2) { animation: fadeInScale 0.6s ease-out 0.35s both; }
.partner-item:nth-child(3) { animation: fadeInScale 0.6s ease-out 0.4s both; }
.partner-item:nth-child(4) { animation: fadeInScale 0.6s ease-out 0.45s both; }
.partner-item:nth-child(5) { animation: fadeInScale 0.6s ease-out 0.5s both; }
.partner-item:nth-child(6) { animation: fadeInScale 0.6s ease-out 0.55s both; }
.partner-item:nth-child(7) { animation: fadeInScale 0.6s ease-out 0.6s both; }
.partner-item:nth-child(8) { animation: fadeInScale 0.6s ease-out 0.65s both; }

/* ==================== Logo叠加层 - 通用样式 ==================== */
.partner-logo {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: calc(10rem); /* 160px - 缩小 */
    height: calc(6rem); /* 96px - 缩小 */
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.partner-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* 悬浮时显示Logo */
.partner-item:hover .partner-logo {
    opacity: 1;
}

/* ==================== 项目链接指示器 ==================== */
.partner-link-indicator {
    position: absolute;
    right: calc(0.75rem); /* 12px */
    bottom: calc(0.75rem); /* 12px */
    width: calc(2.5rem); /* 40px */
    height: calc(2.5rem); /* 40px */
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 15;
    opacity: 0;
    transform: scale(0.8) translateY(calc(0.5rem));
    transition: all 0.3s ease;
    pointer-events: none;
    box-shadow: 0 calc(0.125rem) calc(0.5rem) rgba(0, 0, 0, 0.2);
}

.partner-link-indicator svg {
    width: calc(1.25rem); /* 20px */
    height: calc(1.25rem); /* 20px */
    color: var(--primary-black);
    transition: transform 0.2s ease;
}

/* 有项目链接的项目悬浮时显示指示器 */
.partner-item.has-project-link:hover .partner-link-indicator,
.partner-item.has-project-link.hovered .partner-link-indicator {
    opacity: 1;
    transform: scale(1) translateY(0);
}

/* 点击效果 */
.partner-item.has-project-link:active .partner-link-indicator {
    transform: scale(0.9) translateY(0);
}

.partner-item.has-project-link:hover .partner-link-indicator svg,
.partner-item.has-project-link.hovered .partner-link-indicator svg {
    transform: translate(calc(0.125rem), calc(-0.125rem)); /* 箭头微微向右上移动 */
}

/* 半透明遮罩层（所有partner-item） */
.partner-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

/* 悬浮时显示遮罩层 */
.partner-item:hover::after {
    opacity: 1;
}

/* JavaScript 添加的悬浮状态支持 */
.partner-item.hovered .partner-logo {
    opacity: 1;
}

.partner-item.hovered::after {
    opacity: 1;
}

/* 更多项的动画延迟 */
.partner-item:nth-child(n+9) {
    animation: fadeInScale 0.6s ease-out 0.7s both;
}

/* ==================== 动画效果 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(calc(1.25rem)); /* 20px */
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}