:root {
    --shop-bg: #f3f6fb;
    --shop-bg-soft: #eef3f9;
    --shop-surface: #ffffff;
    --shop-surface-soft: #f8fbff;
    --shop-surface-tint: rgba(255, 255, 255, 0.72);
    --shop-border: #dbe4f0;
    --shop-border-strong: #c8d6e5;
    --shop-text: #0f172a;
    --shop-muted: #5f6f86;
    --shop-accent: #2563eb;
    --shop-accent-strong: #1d4ed8;
    --shop-accent-soft: #dbeafe;
    --shop-success: #0f766e;
    --shop-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
    --shop-shadow-soft: 0 10px 24px rgba(15, 23, 42, 0.06);
    --shop-radius: 22px;
}

body.shop-page {
    min-height: 100vh;
    margin: 0;
    color: var(--shop-text);
    background:
        radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 22%),
        radial-gradient(circle at top right, rgba(14, 165, 233, 0.08), transparent 18%),
        linear-gradient(180deg, #f8fbff 0%, var(--shop-bg) 100%);
    overflow-x: hidden;
}

body.shop-page a {
    text-decoration: none;
}

body.shop-page .page-shell,
body.shop-page .shop-shell,
body.shop-page .container-shell,
body.shop-page .shell,
body.shop-page .container {
    width: min(90vw, 1800px) !important;
    margin: 24px auto 0 !important;
    padding: 28px !important;
    border-radius: 32px !important;
    background: var(--shop-surface);
    border: 1px solid rgba(219, 228, 240, 0.95);
    box-shadow: var(--shop-shadow);
    position: relative;
    z-index: 1;
}

body.shop-page .auth-shell {
    width: min(90vw, 1480px) !important;
}

.shop-header {
    position: sticky;
    top: 0;
    z-index: 30;
    padding: 0;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid rgba(200, 214, 229, 0.9);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
    backdrop-filter: blur(10px);
}

.shop-topbar,
.shop-navbar {
    width: 100%;
    max-width: none;
    margin: 0;
}

.shop-topbar {
    border-bottom: 1px solid rgba(219, 228, 240, 0.82);
    background: rgba(248, 251, 255, 0.94);
}

.shop-topbar__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: min(92vw, 1840px);
    margin: 0 auto;
    gap: 16px;
    padding: 12px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    font-size: 0.88rem;
    color: var(--shop-muted);
}

.shop-topbar__left,
.shop-topbar__right {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
}

.shop-topbar__left span,
.shop-topbar__right a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--shop-muted);
    font-weight: 600;
}

.shop-topbar__right a:hover {
    color: var(--shop-accent);
}

.shop-navbar {
    border: 0;
    border-radius: 0 !important;
    background: rgba(255, 255, 255, 0.98) !important;
    box-shadow: none;
    padding: 0;
    border-bottom: 0;
}

.shop-navbar .container-fluid {
    width: min(92vw, 1840px);
    margin: 0 auto;
    padding: 18px 0 !important;
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    display: flex;
    align-items: center;
    gap: 18px;
}

.shop-brand {
    display: inline-flex;
    align-items: center;
}

.shop-brand__logo {
    height: 46px;
    width: auto;
    display: block;
}

.shop-navbar .navbar-toggler {
    border: 1px solid var(--shop-border-strong);
    border-radius: 14px;
    padding: 0.55rem 0.7rem;
}

.shop-navbar .navbar-toggler:focus {
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.12);
}

.shop-navbar .navbar-nav {
    align-items: center;
    gap: 6px;
}

.shop-navbar .nav-link,
.shop-navbar .nav-cta {
    font-weight: 700;
    border-radius: 14px;
    padding: 0.75rem 1rem !important;
    transition: all 0.2s ease;
}

.shop-navbar .nav-link {
    color: var(--shop-muted) !important;
}

.shop-navbar .nav-link:hover,
.shop-navbar .nav-link.active {
    color: var(--shop-text) !important;
    background: var(--shop-bg-soft);
}

.shop-navbar .nav-cta {
    min-width: 118px;
}

.shop-nav-meta {
    padding: 0.6rem 0.9rem;
    border-radius: 14px;
    background: rgba(37, 99, 235, 0.08);
    color: var(--shop-muted);
    font-size: 0.88rem;
    font-weight: 600;
    white-space: nowrap;
}

.nav-link-user {
    display: inline-flex !important;
    align-items: center;
    gap: 10px;
}

.nav-user-avatar {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: inline-grid;
    place-items: center;
    background: var(--shop-accent-soft);
    color: var(--shop-accent-strong);
}

.shop-navbar .badge {
    background: var(--shop-accent-soft) !important;
    color: var(--shop-accent-strong) !important;
    border-radius: 999px;
    padding: 0.35rem 0.55rem;
    font-weight: 800;
}

.shop-navbar .dropdown-menu {
    border: 1px solid var(--shop-border);
    border-radius: 16px;
    box-shadow: var(--shop-shadow);
    padding: 10px;
}

.shop-navbar .dropdown-item {
    border-radius: 12px;
    padding: 0.7rem 0.85rem;
}

.shop-navbar .dropdown-item:hover {
    background: var(--shop-bg-soft);
}

body.shop-page .alert {
    border: 1px solid var(--shop-border);
    border-radius: 18px;
    box-shadow: var(--shop-shadow-soft);
}

.shop-page .btn {
    border-radius: 14px;
    font-weight: 700;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.shop-page .btn:hover {
    transform: translateY(-1px);
}

.shop-page .btn-primary,
.shop-page .nav-cta {
    background: linear-gradient(135deg, var(--shop-accent), var(--shop-accent-strong));
    border-color: transparent;
}

.shop-page .btn-outline-primary {
    border-color: var(--shop-border-strong);
    color: var(--shop-text);
}

.shop-page .btn-outline-primary:hover {
    background: var(--shop-bg-soft);
    border-color: var(--shop-border-strong);
    color: var(--shop-text);
}

.shop-page .form-control,
.shop-page .form-select {
    border: 1px solid var(--shop-border-strong);
    border-radius: 14px;
    min-height: 50px;
    background: #fff;
    box-shadow: none;
}

.shop-page .form-control:focus,
.shop-page .form-select:focus {
    border-color: var(--shop-accent);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.12);
}

.shop-page h1,
.shop-page h2,
.shop-page h3,
.shop-page h4,
.shop-page h5,
.shop-page h6,
.main-title,
.detail-title {
    color: var(--shop-text);
}

.shop-page h1 { font-size: clamp(2rem, 2.6vw, 2.8rem); }
.shop-page h2 { font-size: clamp(1.55rem, 2vw, 2rem); }
.shop-page h3 { font-size: clamp(1.2rem, 1.5vw, 1.45rem); }
.shop-page h4,
.shop-page h5,
.shop-page h6 { font-size: clamp(1rem, 1.1vw, 1.15rem); }

.detail-hero,
.catalog-toolbar,
.filter-panel,
.catalog-main,
.detail-panel,
.card-soft,
.shop-page .card {
    background: transparent;
    border: 0;
    box-shadow: none;
    backdrop-filter: none;
}

.catalog-hero__eyebrow,
.detail-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.45rem 0.8rem;
    border-radius: 999px;
    background: var(--shop-accent-soft);
    color: var(--shop-accent-strong);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.main-title,
.detail-title {
    margin: 14px 0 0;
    letter-spacing: -0.05em;
    font-weight: 800;
    line-height: 1;
}

.catalog-hero__lead,
.detail-lead,
.shop-page .text-muted {
    color: var(--shop-muted) !important;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.stat-card {
    border: 1px solid rgba(219, 228, 240, 0.9);
    border-radius: 20px;
    padding: 20px 18px;
    background: rgba(255,255,255,0.78);
    min-height: 118px;
}

.stat-value {
    font-size: 2rem;
    line-height: 1;
    font-weight: 800;
    color: var(--shop-text);
}

.stat-label {
    margin-top: 8px;
    color: var(--shop-muted);
    font-weight: 600;
}

.catalog-layout {
    display: grid;
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
}

.filter-panel {
    position: sticky;
    top: 124px;
    border-radius: 26px;
    padding: 0;
    background: transparent;
    border: 0;
    backdrop-filter: none;
}

.filter-panel h5,
.catalog-toolbar h2 {
    font-weight: 800;
}

.filter-panel > * {
    padding-left: 24px;
    padding-right: 24px;
}

.filter-panel h5 {
    padding-top: 8px;
    margin-bottom: 16px;
}

.filter-panel hr {
    margin: 0 24px 22px;
    opacity: 1;
    border-color: rgba(200, 214, 229, 0.8);
}

.filter-panel .form-label,
.catalog-toolbar .toolbar-label,
.detail-panel .form-label,
.shop-page .form-label {
    font-size: 0.76rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--shop-muted);
    font-weight: 800;
}

.catalog-main {
    border-radius: 0;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
    backdrop-filter: none;
}

.catalog-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 16px 0 22px;
    margin-bottom: 22px;
    border-radius: 0;
    background: transparent;
    border: 0;
    border-bottom: 1px solid rgba(200, 214, 229, 0.82);
    backdrop-filter: none;
}

.catalog-toolbar__right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.results-count {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.72rem 0.95rem;
    border-radius: 14px;
    background: var(--shop-accent-soft);
    color: var(--shop-accent-strong);
    font-weight: 800;
}

.books-loading {
    text-align: center;
    padding: 72px 20px;
    color: var(--shop-accent-strong);
}

#books-container > .row {
    margin: 0;
}

.book-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid var(--shop-border);
    border-radius: 22px;
    overflow: hidden;
    background: #fff;
    box-shadow: var(--shop-shadow-soft);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 32px rgba(15, 23, 42, 0.1);
}

.book-card__cover {
    position: relative;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
}

.book-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: transform 0.35s ease, opacity 0.25s ease;
}

.book-image.loaded {
    opacity: 1;
}

.book-card:hover .book-image {
    transform: scale(1.03);
}

.book-image.loading {
    background: linear-gradient(90deg, #edf2f7 25%, #e2e8f0 50%, #edf2f7 75%);
    background-size: 200% 100%;
    animation: book-shimmer 1.4s infinite;
}

@keyframes book-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.book-card__overlay {
    position: absolute;
    inset: auto 0 0 0;
    padding: 12px;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    background: linear-gradient(180deg, transparent, rgba(15, 23, 42, 0.8));
}

.book-badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 0.35rem 0.65rem;
    background: rgba(255,255,255,0.18);
    color: #fff;
    font-size: 0.76rem;
    font-weight: 700;
}

.book-badge--light {
    background: rgba(255,255,255,0.92);
    color: var(--shop-text);
}

.book-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 12px;
    padding: 18px;
}

.book-card__title {
    margin: 0;
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.75em;
}

.book-card__meta {
    display: grid;
    gap: 6px;
    color: var(--shop-muted);
    font-size: 0.9rem;
}

.book-card__meta span {
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.book-card__footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    padding-top: 12px;
    border-top: 1px solid var(--shop-border);
    color: var(--shop-muted);
    font-size: 0.85rem;
}

.book-link {
    color: var(--shop-accent-strong);
    font-weight: 800;
}

.pagination-wrapper {
    margin-top: 22px;
}

.pagination .page-link {
    border: 1px solid var(--shop-border);
    border-radius: 12px;
    margin: 0 4px;
    color: var(--shop-text);
    background: #fff;
    box-shadow: var(--shop-shadow-soft);
    padding: 0.75rem 1rem;
}

.pagination .page-link:hover,
.pagination .page-item.active .page-link {
    background: var(--shop-accent);
    border-color: var(--shop-accent);
    color: #fff;
}

.offcanvas.filter-offcanvas {
    width: min(380px, 92vw) !important;
    border: none;
    box-shadow: 0 28px 70px rgba(15, 23, 42, 0.22);
}

.offcanvas.filter-offcanvas .offcanvas-header {
    background: linear-gradient(135deg, var(--shop-accent), var(--shop-accent-strong));
    color: #fff;
}

.offcanvas.filter-offcanvas .btn-close {
    filter: invert(1);
}

.offcanvas.filter-offcanvas .offcanvas-body {
    background: #fff;
}

.detail-hero {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: flex-start;
    border-radius: 30px;
    padding: 24px;
    margin-bottom: 22px;
}

.detail-title {
    font-size: clamp(2rem, 3vw, 3rem);
    margin-top: 0.55rem;
}

.detail-lead {
    max-width: 66ch;
}

.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 1rem;
}

.detail-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 999px;
    padding: 0.58rem 0.9rem;
    background: var(--shop-accent-soft);
    color: var(--shop-accent-strong);
    font-weight: 700;
    font-size: 0.9rem;
}

.detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.92fr);
    gap: 24px;
    align-items: start;
    margin-bottom: 24px;
}

.detail-panel {
    border-radius: 22px;
    padding: 24px;
}

.detail-cover {
    padding: 18px;
}

.book-detail-image {
    width: 100%;
    max-height: 740px;
    object-fit: cover;
    border-radius: 18px;
    box-shadow: 0 18px 48px rgba(15, 23, 42, 0.14);
}

.info-list {
    display: grid;
    gap: 12px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    color: var(--shop-muted);
}

.info-row strong {
    color: var(--shop-text);
}

.purchase-panel .fs-3 {
    font-size: 2rem !important;
}

.purchase-panel .alert {
    box-shadow: none;
    border-radius: 16px;
}

.abstract-tabs .nav-tabs {
    border-bottom: 0;
    gap: 10px;
    margin-bottom: 16px;
}

.abstract-tabs .nav-tabs .nav-link {
    border: 1px solid var(--shop-border);
    background: #fff;
    color: var(--shop-text);
    border-radius: 999px;
    padding: 0.7rem 1rem;
    font-weight: 700;
}

.abstract-tabs .nav-tabs .nav-link.active {
    background: var(--shop-accent);
    border-color: var(--shop-accent);
    color: #fff;
}

.abstract-tabs .tab-content {
    background: var(--shop-surface-soft);
    border: 1px solid var(--shop-border);
    border-radius: 20px;
    padding: 20px;
}

.abstract-text {
    color: #334155;
    line-height: 1.8;
    font-size: 0.98rem;
}

.keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.keyword-tag {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 0.55rem 0.85rem;
    background: var(--shop-accent-soft);
    color: var(--shop-accent-strong);
    border: 0;
}

.shop-footer {
    width: 100%;
    max-width: none;
    margin: 48px 0 0;
    padding: 0;
    border-radius: 0;
    background: #fff;
    color: #cbd5e1;
    box-shadow: 0 -10px 30px rgba(15, 23, 42, 0.03);
    border-top: 1px solid rgba(200, 214, 229, 0.95);
}

.shop-footer__grid {
    display: grid;
    grid-template-columns: minmax(280px, 1.25fr) repeat(3, minmax(180px, 1fr));
    width: min(92vw, 1840px);
    margin: 0 auto;
    gap: 24px;
    padding: 34px 0 42px;
}

.shop-footer__logo {
    height: 38px;
    width: auto;
    margin-bottom: 16px;
}

.shop-footer h6 {
    color: var(--shop-text);
    font-weight: 800;
    margin-bottom: 14px;
}

.shop-footer p,
.shop-footer span,
.shop-footer a {
    display: block;
    color: var(--shop-muted);
    line-height: 1.7;
    margin-bottom: 8px;
}

.shop-footer a:hover {
    color: var(--shop-text);
}

.mobile-filter-toggle {
    display: none;
}

@media (max-width: 1199.98px) {
    .detail-grid,
    .catalog-layout,
    .shop-footer__grid {
        grid-template-columns: 1fr;
    }

    .filter-panel {
        position: static;
    }

}

@media (max-width: 991.98px) {
    .shop-topbar__inner,
    .shop-topbar__left,
    .shop-topbar__right,
    .catalog-toolbar,
    .catalog-toolbar__right,
    .detail-hero {
        flex-direction: column;
        align-items: flex-start;
    }

    .shop-navbar {
        padding: 14px;
    }

    .shop-nav-meta {
        display: none !important;
    }
}

@media (max-width: 767.98px) {
    body.shop-page .page-shell,
    body.shop-page .shop-shell,
    body.shop-page .container-shell,
    body.shop-page .shell,
    body.shop-page .container,
    body.shop-page .auth-shell {
        width: calc(100% - 16px) !important;
        margin-top: 16px !important;
        padding: 18px !important;
        border-radius: 24px !important;
    }

    .shop-header {
        padding: 0;
    }

    .shop-topbar__inner {
        width: calc(100% - 16px);
        padding: 12px 0;
    }

    .shop-navbar .container-fluid {
        width: calc(100% - 16px);
        padding: 14px 0 !important;
    }

    .shop-brand__logo {
        height: 40px;
    }

    .hero-actions,
    .detail-meta {
        gap: 8px;
    }

    .mobile-filter-toggle {
        display: inline-flex;
    }

    .desktop-filter {
        display: none;
    }

    .catalog-toolbar__right,
    .results-count {
        width: 100%;
    }

    .results-count {
        justify-content: center;
        text-align: center;
    }

    .shop-footer {
        width: 100%;
    }
}