:root {
    --catalog-primary: #452b23;
    --catalog-accent: #a56649;
    --catalog-bg: #f7f2ed;
    --catalog-cover: #ece3da;
    --catalog-text: #2a2a2a;
    --catalog-muted: #7a7168;
    --catalog-border: #e2d9d2;
    --catalog-white: #ffffff;
    --catalog-shadow-soft: 0 15px 35px rgba(69, 43, 35, 0.12);
    --catalog-shadow-lift: 0 30px 55px rgba(69, 43, 35, 0.28);
}

/* ---------- toolbar ---------- */
.catalog-gallery-section {
    padding: 70px 0 100px;
    background-color: var(--catalog-bg);
}

.catalog-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 55px;
}

.catalog-search {
    position: relative;
    max-width: 380px;
    width: 100%;
}

.catalog-search__icon {
    position: absolute;
    top: 50%;
    left: 22px;
    transform: translateY(-50%);
    color: var(--catalog-muted);
    font-size: 14px;
    pointer-events: none;
}

.catalog-search__input {
    width: 100%;
    padding: 15px 20px 15px 46px;
    border-radius: 50px;
    border: 1px solid var(--catalog-border);
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(6px);
    color: var(--catalog-text);
    font-size: 15px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.catalog-search__input:focus {
    outline: none;
    border-color: var(--catalog-accent);
    box-shadow: 0 0 0 4px rgba(165, 102, 73, 0.15);
}

.catalog-count {
    margin: 0;
    color: var(--catalog-muted);
    font-size: 14px;
    letter-spacing: 0.3px;
}

.catalog-empty,
.catalog-no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--catalog-muted);
    font-size: 16px;
}

/* ---------- size filter ---------- */
.catalog-size-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: -30px 0 45px;
}

.catalog-size-filter__pill {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 16px;
    border-radius: 50px;
    border: 1px solid var(--catalog-border);
    background: rgba(255, 255, 255, 0.6);
    color: var(--catalog-muted);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.2px;
    cursor: pointer;
    transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.catalog-size-filter__pill:hover {
    border-color: var(--catalog-accent);
    color: var(--catalog-text);
}

.catalog-size-filter__pill:focus-visible {
    outline: 2px solid var(--catalog-accent);
    outline-offset: 2px;
}

.catalog-size-filter__pill.is-active {
    background: var(--catalog-primary);
    border-color: var(--catalog-primary);
    color: var(--catalog-white);
}

.catalog-size-filter__count {
    font-size: 11px;
    font-weight: 700;
    opacity: 0.7;
    font-variant-numeric: tabular-nums;
}

/* ---------- responsive grid ----------
   Desktop 4 cols / Laptop 3 cols / Tablet 2 cols / Mobile 1 col */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 60px 40px;
}

@media (max-width: 1399px) {
    .catalog-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 55px 32px;
    }
}

@media (max-width: 1199px) {
    .catalog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 50px 28px;
    }
}

@media (max-width: 575px) {
    .catalog-grid {
        grid-template-columns: 1fr;
        max-width: 320px;
        margin: 0 auto;
        gap: 55px 0;
    }
}

/* ---------- hardcover book card (real CSS 3D: perspective + preserve-3d + translateZ) ---------- */
.catalog-book-link {
    --book-w: 190px;
    --book-h: calc(var(--book-w) * 1.4);
    --book-depth: calc(var(--book-w) * 0.11);
    --book-spine-w: calc(var(--book-w) * 0.22);
    display: block;
    text-decoration: none;
    cursor: pointer;
    outline: none;
}

.catalog-book-scene {
    display: flex;
    flex-direction: column;
    align-items: center;
    perspective: 900px;
    padding: 10px 0 22px;
}

.catalog-book {
    position: relative;
    width: var(--book-w);
    height: var(--book-h);
    transform-style: preserve-3d;
    transform: rotateY(-28deg);
    transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.catalog-book-link:hover .catalog-book,
.catalog-book-link:focus-visible .catalog-book {
    transform: rotateY(0deg) translateY(-6px);
}

/* front cover face */
.catalog-book__cover {
    position: absolute;
    inset: 0;
    overflow: hidden;
    border-radius: 0 5px 5px 0;
    background: var(--catalog-cover);
    transform: translateZ(var(--book-depth));
    box-shadow: 3px 4px 16px rgba(0, 0, 0, 0.35);
}

/* page edges (right side of the book) */
.catalog-book::before {
    content: "";
    position: absolute;
    left: 0;
    top: 2px;
    width: var(--book-spine-w);
    height: calc(var(--book-h) - 4px);
    transform: translateX(calc(var(--book-w) - (var(--book-spine-w) / 2))) rotateY(90deg);
    background: repeating-linear-gradient(90deg, #ffffff 0, #ffffff 2px, #ece4da 2px, #ece4da 3px);
}

/* back cover */
.catalog-book::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 0 5px 5px 0;
    background: var(--catalog-primary);
    transform: translateZ(calc(var(--book-depth) * -1));
    box-shadow: -12px 0 40px 6px rgba(0, 0, 0, 0.28);
}

.catalog-book-link:focus-visible .catalog-book__cover {
    box-shadow:
        0 0 0 3px var(--catalog-accent),
        3px 4px 16px rgba(0, 0, 0, 0.35);
}

.catalog-book__shadow {
    width: calc(var(--book-w) * 0.85);
    height: 18px;
    margin-top: -6px;
    background: radial-gradient(ellipse at center, rgba(69, 43, 35, 0.38) 0%, rgba(69, 43, 35, 0) 72%);
    filter: blur(2px);
    opacity: 0.55;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.catalog-book-link:hover .catalog-book__shadow,
.catalog-book-link:focus-visible .catalog-book__shadow {
    opacity: 0.8;
    transform: scale(1.08);
}

.catalog-book__skeleton {
    position: absolute;
    inset: 0;
    background: linear-gradient(100deg, #e7ded4 30%, #f4efe8 50%, #e7ded4 70%);
    background-size: 200% 100%;
    animation: catalogShimmer 1.4s ease-in-out infinite;
    opacity: 1;
    transition: opacity 0.4s ease;
    z-index: 2;
}

.catalog-book-link.is-loaded .catalog-book__skeleton {
    opacity: 0;
    pointer-events: none;
}

@keyframes catalogShimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

.catalog-book__img {
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: 1;
}

.catalog-book-link.is-loaded .catalog-book__img {
    opacity: 1;
}

.catalog-book__sheen {
    position: absolute;
    inset: 0;
    background: linear-gradient(115deg, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0) 30%);
    z-index: 3;
    pointer-events: none;
}

.catalog-book__badge,
.catalog-book__new {
    position: absolute;
    z-index: 4;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    padding: 5px 10px;
    border-radius: 30px;
    backdrop-filter: blur(4px);
}

.catalog-book__badge {
    top: 12px;
    left: 12px;
    color: var(--catalog-white);
    background: rgba(69, 43, 35, 0.65);
    display: none;
}

.catalog-book__new {
    top: 12px;
    right: 12px;
    color: var(--catalog-white);
    background: rgba(165, 102, 73, 0.9);
}

.catalog-book__meta {
    display: block;
    text-align: center;
}

.catalog-book__title {
    display: block;
    font-size: 17px;
    font-weight: 600;
    color: var(--catalog-text);
    letter-spacing: 0.2px;
}

.catalog-book__cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--catalog-accent);
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.35s ease, transform 0.35s ease;
}

.catalog-book-link:hover .catalog-book__cta,
.catalog-book-link:focus-visible .catalog-book__cta {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 575px) {
    .catalog-book-link {
        --book-w: 170px;
    }
}

@media (prefers-reduced-motion: reduce) {

    .catalog-book,
    .catalog-book__shadow,
    .catalog-book__cta,
    .catalog-book__img {
        transition: none !important;
    }

    .catalog-book__skeleton {
        animation: none !important;
    }
}