/**
 * 分类浏览页 - 叠放卡片 + 手风琴展开 + 拍立得网格
 */

.categories-page {
    max-width: 72rem;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

.categories-page-header {
    margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
    .categories-page {
        padding: 3rem 1.5rem 4rem;
    }

    .categories-page-header {
        margin-bottom: 3rem;
    }
}

.categories-page-heading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

@media (min-width: 768px) {
    .categories-page-heading {
        gap: 0.75rem;
        margin-bottom: 0.5rem;
    }
}

.categories-page-icon {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
    fill: none;
    stroke: #0ea5e9;
    stroke-width: 1.75;
    stroke-linecap: round;
    stroke-linejoin: round;
}

@media (min-width: 768px) {
    .categories-page-icon {
        width: 1.75rem;
        height: 1.75rem;
    }
}

.categories-page-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    color: #1e293b;
}

@media (min-width: 768px) {
    .categories-page-title {
        font-size: 1.875rem;
    }
}

.categories-page-desc {
    margin: 0;
    padding-left: 1.75rem;
    font-size: 0.875rem;
    color: #64748b;
}

@media (min-width: 768px) {
    .categories-page-desc {
        padding-left: 2.75rem;
        font-size: 1rem;
    }
}

.categories-page-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 5rem 1rem;
    color: #94a3b8;
}

.categories-page-empty svg {
    width: 2.5rem;
    height: 2.5rem;
    opacity: 0.4;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
}

/* ===== 分类网格 ===== */

.categories-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0.75rem;
    user-select: none;
}

@media (min-width: 640px) {
    .categories-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .categories-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

.categories-grid.has-expanded .category-album-item:not(.is-expanded) {
    display: none;
}

.categories-grid.has-expanded .category-album-item.is-expanded {
    grid-column: 1 / -1;
}

/* ===== 相册卡片 ===== */

.category-album-item {
    opacity: 0;
    transform: translateY(1.875rem);
    animation: categoryAlbumIn 0.6s ease-out forwards;
    animation-delay: calc(var(--album-index, 0) * 0.08s);
}

@keyframes categoryAlbumIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-album-card {
    overflow: hidden;
    border-radius: 1.5rem;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(1rem);
    -webkit-backdrop-filter: blur(1rem);
    border: 1px solid rgba(14, 165, 233, 0.12);
    box-shadow:
        0 0.25rem 1.5rem rgba(148, 163, 184, 0.12),
        inset 0 0.0625rem 0 rgba(255, 255, 255, 0.8);
}

.category-album-toggle {
    display: block;
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: pointer;
    text-align: inherit;
    font: inherit;
    color: inherit;
}

.category-album-preview {
    padding: 1rem 1rem 0.75rem;
}

@media (min-width: 768px) {
    .category-album-preview {
        padding: 1.5rem 1.5rem 1rem;
    }
}

/* ===== 叠放预览 ===== */

.category-stack {
    position: relative;
    width: 100%;
    max-width: 12.5rem;
    height: 9rem;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .category-stack {
        max-width: 16.25rem;
        height: 12rem;
    }
}

.category-stack__layers {
    position: absolute;
    inset: 0;
}

.category-stack__layer {
    position: absolute;
    inset: 0;
    transform-origin: center center;
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    will-change: transform;
}

.category-stack__layer[data-layer="0"] {
    transform: rotate(-4deg);
}

.category-stack__layer[data-layer="1"] {
    transform: translateY(0.75rem) scale(0.96);
}

.category-stack__layer[data-layer="2"] {
    transform: translateY(1.5rem) scale(0.92) rotate(3deg);
}

.category-album-card:hover .category-stack__layer[data-layer="0"],
.category-album-item.is-expanded .category-stack__layer[data-layer="0"] {
    transform: rotate(-12deg) translateY(-0.25rem) scale(0.95);
}

.category-album-card:hover .category-stack__layer[data-layer="1"],
.category-album-item.is-expanded .category-stack__layer[data-layer="1"] {
    transform: translateY(-0.625rem) scale(1);
}

.category-album-card:hover .category-stack__layer[data-layer="2"],
.category-album-item.is-expanded .category-stack__layer[data-layer="2"] {
    transform: rotate(12deg) translateY(-0.25rem) scale(0.95);
}

.category-stack__frame {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    border-radius: 0.75rem;
    box-shadow:
        0 0.625rem 1.5rem rgba(15, 23, 42, 0.14),
        0 0 0 1px rgba(15, 23, 42, 0.05);
}

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

.category-stack__badge {
    position: absolute;
    right: 0;
    bottom: -0.5rem;
    z-index: 20;
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
    background: #0ea5e9;
    color: #fff;
    font-size: 0.625rem;
    font-weight: 700;
    line-height: 1.4;
    box-shadow: 0 0.25rem 0.75rem rgba(14, 165, 233, 0.35);
}

@media (min-width: 768px) {
    .category-stack__badge {
        padding: 0.125rem 0.625rem;
        font-size: 0.75rem;
    }
}

.category-album-meta {
    margin-top: 1rem;
    text-align: center;
}

@media (min-width: 768px) {
    .category-album-meta {
        margin-top: 1.5rem;
    }
}

.category-album-name {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    color: #1e293b;
}

@media (min-width: 768px) {
    .category-album-name {
        font-size: 1.125rem;
    }
}

.category-album-date {
    margin: 0.25rem 0 0;
    font-size: 0.625rem;
    color: #64748b;
}

@media (min-width: 768px) {
    .category-album-date {
        font-size: 0.75rem;
    }
}

/* ===== 展开区域 ===== */

.category-album-expand {
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    transition:
        grid-template-rows 0.4s cubic-bezier(0.25, 0.1, 0.25, 1),
        opacity 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.category-album-item.is-expanded .category-album-expand {
    grid-template-rows: 1fr;
    opacity: 1;
}

.category-album-expand__inner {
    overflow: hidden;
}

.category-album-expand__panel {
    padding: 0 1rem 1.5rem;
}

@media (min-width: 768px) {
    .category-album-expand__panel {
        padding: 0 1.5rem 1.5rem;
    }
}

.category-photo-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
    padding: 1rem;
    border-radius: 1rem;
    background: rgba(248, 250, 252, 0.8);
}

@media (min-width: 640px) {
    .category-photo-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 1.25rem;
        padding: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .category-photo-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.category-photo-loading {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 2rem 1rem;
    color: #64748b;
    font-size: 0.875rem;
}

.category-photo-loading__spinner {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid #0ea5e9;
    border-top-color: transparent;
    border-radius: 50%;
    animation: categorySpin 0.8s linear infinite;
}

@keyframes categorySpin {
    to {
        transform: rotate(360deg);
    }
}

/* ===== 拍立得照片卡片 ===== */

.category-photo-card {
    position: relative;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: pointer;
    text-align: left;
    opacity: 0;
    transform: translateY(1.875rem) rotate(var(--photo-tilt, 0deg));
    animation: categoryPhotoIn 0.6s ease-out forwards;
    animation-delay: calc(var(--photo-index, 0) * 0.05s);
}

@keyframes categoryPhotoIn {
    to {
        opacity: 1;
        transform: translateY(0) rotate(var(--photo-tilt, 0deg));
    }
}

.category-photo-card:hover {
    z-index: 10;
    transform: rotate(0deg) scale(1.03);
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.category-photo-frame {
    position: relative;
    padding: 0.5rem 0.5rem 1.5rem;
    border-radius: 0.125rem;
    background: #fff;
    box-shadow:
        0 0.625rem 1.5rem rgba(15, 23, 42, 0.12),
        0 0 0 1px rgba(15, 23, 42, 0.04);
    transition: box-shadow 0.3s ease;
}

@media (min-width: 768px) {
    .category-photo-frame {
        padding: 0.625rem 0.625rem 2rem;
    }
}

.category-photo-card:hover .category-photo-frame {
    box-shadow:
        0 1rem 2rem rgba(15, 23, 42, 0.18),
        0 0 0 1px rgba(15, 23, 42, 0.04);
}

.category-photo-media {
    position: relative;
    overflow: hidden;
    border-radius: 0.0625rem;
    background: #e2e8f0;
}

.category-photo-media.is-landscape {
    aspect-ratio: 4 / 3;
}

.category-photo-media.is-portrait {
    aspect-ratio: 4 / 5;
}

.category-photo-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.category-photo-card:hover .category-photo-media img {
    transform: scale(1.05);
}

.category-photo-shade {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0);
    transition: background 0.3s ease;
    pointer-events: none;
}

.category-photo-card:hover .category-photo-shade {
    background: rgba(0, 0, 0, 0.1);
}

.category-photo-caption {
    position: absolute;
    right: 0;
    bottom: 0.375rem;
    left: 0;
    padding: 0 0.375rem;
    text-align: center;
    font-size: 0.75rem;
    font-style: italic;
    color: #94a3b8;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.category-photo-tape {
    position: absolute;
    top: -0.5rem;
    left: 0.5rem;
    width: 2rem;
    height: 0.75rem;
    border-radius: 0.125rem;
    background: rgba(251, 191, 36, 0.55);
    transform: rotate(-6deg);
    pointer-events: none;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

@media (min-width: 768px) {
    .category-photo-tape {
        left: 0.75rem;
        width: 2.5rem;
        height: 1rem;
    }
}

/* ===== 无障碍：减少动画 ===== */

html.no-animations .category-album-item,
html.no-animations .category-photo-card {
    animation: none;
    opacity: 1;
    transform: none;
}

html.no-animations .category-stack__layer,
html.no-animations .category-photo-card:hover {
    transition: none;
}