:root {
    --c-ink: #17211b;
    --c-muted: #66746d;
    --c-soft: #eef3ee;
    --c-bg: #f7f5ef;
    --c-panel: #ffffff;
    --c-green: #1f8f4d;
    --c-green-dark: #126536;
    --c-red: #d84a2b;
    --c-line: #dfe6df;
    --shadow-1: 0 12px 34px rgba(23, 33, 27, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--c-ink);
    background: var(--c-bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.6;
}

body.nav-open {
    overflow: hidden;
}

img {
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

a:hover {
    color: var(--c-green-dark);
}

button,
input {
    font: inherit;
}

.site-shell {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(247, 245, 239, 0.94);
    border-bottom: 1px solid rgba(31, 143, 77, 0.14);
    backdrop-filter: blur(14px);
}

.nav-shell {
    min-height: 72px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0;
    white-space: nowrap;
}

.brand img {
    border-radius: 8px;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    font-size: 0.95rem;
    color: #314138;
}

.site-nav a {
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}

.site-nav a:hover {
    border-bottom-color: var(--c-green);
}

.site-nav a.active,
.site-nav a[aria-current="page"] {
    color: var(--c-green-dark);
    border-bottom-color: var(--c-green);
    font-weight: 800;
}

.nav-search {
    display: flex;
    align-items: center;
    width: 290px;
    border: 1px solid var(--c-line);
    background: var(--c-panel);
    border-radius: 8px;
    overflow: hidden;
}

.nav-search input {
    min-width: 0;
    width: 100%;
    border: 0;
    outline: 0;
    padding: 10px 12px;
    background: transparent;
}

.nav-search button,
.btn,
.search-button,
.load-more {
    border: 0;
    border-radius: 8px;
    background: var(--c-green);
    color: #fff;
    cursor: pointer;
    transition: transform 0.16s ease, background 0.16s ease;
}

.nav-search button {
    align-self: stretch;
    flex: 0 0 auto;
    min-width: 64px;
    border-radius: 0;
    padding: 0 14px;
    white-space: nowrap;
}

.nav-search button:hover,
.btn:hover,
.search-button:hover,
.load-more:hover {
    background: var(--c-green-dark);
    color: #fff;
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
    padding: 10px;
}

.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--c-ink);
    margin: 5px 0;
}

.hero {
    padding: 78px 0 54px;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.06fr) minmax(380px, 0.94fr);
    gap: 54px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--c-green-dark);
    font-weight: 700;
    font-size: 0.9rem;
    margin: 0 0 16px;
}

.eyebrow::before {
    content: "";
    width: 32px;
    height: 2px;
    background: var(--c-green);
}

.hero h1,
.page-hero h1,
.detail-title {
    margin: 0;
    color: var(--c-ink);
    font-size: 3.25rem;
    line-height: 1.12;
    letter-spacing: 0;
}

.hero-lede,
.page-lede {
    max-width: 690px;
    margin: 22px 0 0;
    color: var(--c-muted);
    font-size: 1.08rem;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    margin-top: 30px;
}

.hero-search,
.wide-search {
    display: flex;
    width: min(100%, 560px);
    min-height: 56px;
    border: 1px solid var(--c-line);
    background: var(--c-panel);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-1);
}

.hero-search input,
.wide-search input {
    min-width: 0;
    flex: 1;
    border: 0;
    outline: 0;
    padding: 0 18px;
    background: transparent;
}

.search-button {
    min-width: 92px;
    border-radius: 0;
    flex: 0 0 auto;
    white-space: nowrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 18px;
    font-weight: 700;
    white-space: nowrap;
}

.btn.secondary {
    border: 1px solid var(--c-line);
    background: var(--c-panel);
    color: var(--c-ink);
}

.btn.secondary:hover {
    border-color: var(--c-green);
    background: #f4fbf5;
    color: var(--c-green-dark);
}

.hero-points,
.trust-grid,
.process-grid,
.stats-grid {
    display: grid;
    gap: 12px;
}

.hero-points {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 32px;
}

.point,
.stat,
.trust-card,
.process-card,
.category-chip,
.meta-card,
.panel-card {
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
}

.point {
    padding: 14px;
}

.point strong {
    display: block;
    font-size: 1.2rem;
    color: var(--c-green-dark);
}

.point span,
.stat span,
.book-meta,
.muted {
    color: var(--c-muted);
}

.cover-collage {
    position: relative;
    min-height: 560px;
    padding: 28px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: #fbfaf5;
    box-shadow: var(--shadow-1);
    overflow: hidden;
}

.cover-collage::before {
    content: "";
    position: absolute;
    left: 28px;
    right: 28px;
    bottom: 30px;
    height: 40px;
    border-radius: 50%;
    background: rgba(23, 33, 27, 0.08);
    filter: blur(16px);
}

.collage-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    align-items: stretch;
}

.collage-grid .bby-cover-crop {
    width: 100%;
}

.collage-note {
    position: absolute;
    left: 28px;
    right: 28px;
    bottom: 24px;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 16px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.92);
}

.bby-cover-crop {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    background: #fff;
    aspect-ratio: 3 / 4;
    border: 1px solid rgba(23, 33, 27, 0.08);
}

.bby-cover-crop img {
    width: 100%;
    height: 114%;
    object-fit: cover;
    object-position: top center;
    display: block;
}

.bby-cover-crop.contain img {
    object-fit: contain;
    background: #fff;
}

.section {
    padding: 44px 0;
}

.section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 22px;
}

.section-title {
    margin: 0;
    font-size: 2rem;
    line-height: 1.2;
}

.section-desc {
    max-width: 640px;
    margin: 8px 0 0;
    color: var(--c-muted);
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.book-card {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
    overflow: hidden;
    box-shadow: 0 1px 0 rgba(23, 33, 27, 0.03);
    transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.book-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-1);
}

.book-card .bby-cover-crop {
    border: 0;
    border-bottom: 1px solid var(--c-line);
    border-radius: 0;
}

.book-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    padding: 14px;
}

.book-title {
    margin: 0;
    font-weight: 800;
    line-height: 1.42;
}

.book-title a {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-price {
    margin-top: auto;
    display: grid;
    gap: 7px;
}

.book-price-main,
.book-price-meta {
    display: flex;
    align-items: baseline;
    gap: 8px;
    min-width: 0;
}

.book-price-main {
    flex-wrap: wrap;
}

.book-price-meta {
    align-items: center;
}

.book-price-meta .tag {
    margin-left: auto;
}

.price {
    color: var(--c-red);
    font-size: 1.15rem;
    font-weight: 800;
}

.book-price:has(.integral-buy-price) .price {
    color: var(--c-muted);
    font-size: 0.96rem;
    font-weight: 650;
}

.integral-buy-price {
    display: inline-flex;
    align-items: baseline;
    gap: 2px;
    color: var(--c-red);
    font-size: 1.08rem;
    font-weight: 850;
    white-space: nowrap;
}

.integral-buy-price small {
    margin-right: 2px;
    color: #a86215;
    font-size: 0.72rem;
    font-weight: 750;
}

.integral-points {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 0 8px;
    border: 1px solid rgba(31, 143, 77, 0.2);
    border-radius: 999px;
    background: #edf7f0;
    color: var(--c-green-dark);
    font-size: 0.76rem;
    font-weight: 750;
    white-space: nowrap;
}

.tag {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 0 8px;
    border-radius: 999px;
    background: var(--c-soft);
    color: var(--c-green-dark);
    font-size: 0.78rem;
    font-weight: 700;
    white-space: nowrap;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.category-chip {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    min-height: 56px;
    padding: 0 16px;
}

.category-chip strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.category-chip span {
    color: var(--c-red);
    font-weight: 800;
}

.process-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.process-card,
.trust-card,
.panel-card {
    padding: 20px;
}

.process-card b {
    color: var(--c-green-dark);
}

.trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qr-band {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
    align-items: center;
    padding: 28px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: #213529;
    color: #fff;
}

.qr-band p {
    color: rgba(255, 255, 255, 0.78);
}

.qr-stack {
    display: flex;
    gap: 14px;
}

.qr-stack figure,
.footer-qrs figure {
    margin: 0;
    text-align: center;
}

.qr-stack img,
.footer-qrs img {
    display: block;
    width: 116px;
    height: 116px;
    object-fit: cover;
    border-radius: 8px;
    background: #fff;
    padding: 6px;
}

.qr-stack figcaption,
.footer-qrs figcaption {
    margin-top: 6px;
    font-size: 0.82rem;
}

.page-hero {
    padding: 56px 0 30px;
    border-bottom: 1px solid rgba(31, 143, 77, 0.12);
}

.breadcrumbs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 18px;
    color: var(--c-muted);
    font-size: 0.9rem;
}

.breadcrumbs a {
    color: var(--c-green-dark);
}

.filter-panel {
    margin-top: 24px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
}

.filter-row {
    display: grid;
    grid-template-columns: 92px 1fr;
    gap: 16px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--c-line);
}

.filter-row:last-child {
    border-bottom: 0;
}

.filter-label {
    color: var(--c-muted);
    font-weight: 700;
}

.filter-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
}

.filter-list a {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 0 10px;
    border-radius: 999px;
    background: var(--c-soft);
    color: #314138;
}

.filter-list a.active,
.filter-list a:hover {
    background: var(--c-green);
    color: #fff;
}

.result-toolbar {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: center;
    margin-bottom: 18px;
}

.load-more-wrap {
    text-align: center;
    margin-top: 26px;
}

.load-more {
    min-height: 44px;
    padding: 0 24px;
}

.load-more[disabled] {
    cursor: not-allowed;
    opacity: 0.55;
    transform: none;
}

.detail-grid {
    display: grid;
    grid-template-columns: minmax(310px, 0.88fr) minmax(0, 1.12fr);
    gap: 34px;
    align-items: start;
    padding: 36px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
}

.detail-cover {
    border-radius: 8px;
    background: #f8faf7;
    padding: 18px;
}

.detail-canvas-frame {
    position: relative;
    display: grid;
    place-items: center;
    width: 100%;
    aspect-ratio: 75 / 88;
    margin: 0;
    overflow: hidden;
    border: 1px solid rgba(23, 33, 27, 0.08);
    border-radius: 8px;
    background: #fff;
}

.detail-cover-canvas {
    display: block;
    width: 100%;
    height: auto;
    max-height: 100%;
    object-fit: contain;
    object-position: top center;
    background: #fff;
    opacity: 0;
    transition: opacity 160ms ease;
}

.detail-cover-canvas.is-ready {
    opacity: 1;
}

.detail-cover-canvas.is-loading,
.detail-inline-canvas.is-loading {
    background: #f1f4ef;
}

.canvas-image-source {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    margin: -1px !important;
    padding: 0 !important;
    overflow: hidden !important;
    clip: rect(0 0 0 0) !important;
    clip-path: inset(50%) !important;
    border: 0 !important;
}

.detail-title {
    font-size: 2.35rem;
}

.detail-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin: 16px 0;
}

.detail-price {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin: 20px 0;
    color: var(--c-red);
    font-weight: 900;
    font-size: 2.1rem;
}

.detail-price small {
    color: var(--c-muted);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: line-through;
}

.detail-pricing {
    display: flex;
    align-items: stretch;
    gap: 12px;
    flex-wrap: wrap;
    margin: 20px 0;
}

.detail-pricing .detail-price {
    margin: 0;
}

.detail-integral-price {
    display: flex;
    align-items: baseline;
    gap: 8px;
    flex-wrap: wrap;
    min-height: 52px;
    padding: 10px 14px;
    border: 1px solid rgba(216, 74, 43, 0.18);
    border-radius: 8px;
    background: #fff6f1;
}

.detail-integral-price .label {
    color: #a86215;
    font-size: 0.84rem;
    font-weight: 750;
}

.detail-integral-price strong {
    color: var(--c-red);
    font-size: 1.5rem;
    font-weight: 900;
}

.detail-integral-price .integral-points {
    border: 0;
}

.meta-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin: 20px 0;
}

.meta-card {
    padding: 12px;
}

.meta-card span {
    display: block;
    color: var(--c-muted);
    font-size: 0.84rem;
}

.meta-card b {
    display: block;
    overflow-wrap: anywhere;
}

.buy-panel {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 16px;
    align-items: center;
    margin-top: 20px;
    padding: 16px;
    border-radius: 8px;
    background: var(--c-soft);
}

.buy-panel img {
    width: 112px;
    height: 112px;
    object-fit: cover;
    border-radius: 8px;
    background: #fff;
    padding: 6px;
}

.book-detail-copy {
    padding: 24px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
    overflow: hidden;
}

.book-detail-copy img {
    max-width: 100%;
    height: auto;
    display: block;
    clip-path: inset(0 0 12% 0);
}

.detail-inline-canvas {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto 18px;
    border-radius: 8px;
    background: #fff;
}

.column-hero-media {
    width: min(520px, 100%);
    margin: 26px 0 0;
    overflow: hidden;
    border: 1px solid rgba(31, 143, 77, 0.16);
    border-radius: 8px;
    aspect-ratio: 16 / 7;
    background: #edf3ea;
}

.column-hero-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.column-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.column-card {
    min-height: 220px;
    padding: 22px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 14px;
}

.column-card-media {
    margin: 0;
    overflow: hidden;
    border-radius: 8px;
    aspect-ratio: 16 / 9;
    background: #edf3ea;
}

.column-card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.18s ease;
}

.column-card:hover .column-card-media img {
    transform: scale(1.03);
}

.column-card h2 {
    margin: 0 0 10px;
    font-size: 1.3rem;
}

.about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 24px;
}

.stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.stat {
    padding: 18px;
}

.stat strong {
    display: block;
    color: var(--c-green-dark);
    font-size: 1.6rem;
}

.site-footer {
    margin-top: 56px;
    padding: 40px 0 22px;
    background: #18251d;
    color: rgba(255, 255, 255, 0.78);
}

.footer-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) 180px minmax(260px, 0.7fr);
    gap: 30px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 1.2rem;
}

.site-footer h2 {
    margin: 0 0 12px;
    color: #fff;
    font-size: 1rem;
}

.site-footer a {
    display: block;
    margin: 8px 0;
}

.footer-qrs {
    display: flex;
    gap: 12px;
}

.footer-records {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px 18px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    font-size: 0.85rem;
}

.footer-records a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 0;
}

.go-top {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 20;
    width: 44px;
    height: 44px;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
    color: var(--c-green-dark);
    box-shadow: var(--shadow-1);
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.16s ease;
}

.go-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.empty-state {
    padding: 32px;
    text-align: center;
    border: 1px solid var(--c-line);
    border-radius: 8px;
    background: var(--c-panel);
    color: var(--c-muted);
}

@media (max-width: 1020px) {
    .nav-shell {
        grid-template-columns: auto auto;
    }

    .nav-toggle {
        display: block;
        justify-self: end;
    }

    .site-nav,
    .nav-search {
        display: none;
    }

    body.nav-open .site-nav,
    body.nav-open .nav-search {
        display: flex;
        position: fixed;
        left: 20px;
        right: 20px;
        z-index: 40;
        background: var(--c-panel);
        border: 1px solid var(--c-line);
        box-shadow: var(--shadow-1);
    }

    body.nav-open .site-nav {
        top: 82px;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 10px;
        border-radius: 8px 8px 0 0;
    }

    body.nav-open .site-nav a {
        padding: 12px;
        border-bottom: 1px solid var(--c-line);
    }

    body.nav-open .site-nav a.active,
    body.nav-open .site-nav a[aria-current="page"] {
        border-bottom-color: var(--c-green);
        background: #f4fbf5;
    }

    body.nav-open .nav-search {
        top: 322px;
        width: auto;
        border-radius: 0 0 8px 8px;
    }

    .hero-grid,
    .detail-grid,
    .about-layout,
    .qr-band {
        grid-template-columns: 1fr;
    }

    .cover-collage {
        min-height: 470px;
    }

    .book-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .category-grid,
    .process-grid,
    .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .site-shell {
        width: min(100% - 28px, 1180px);
    }

    .hero {
        padding-top: 42px;
    }

    .hero h1,
    .page-hero h1 {
        font-size: 2.25rem;
    }

    .detail-title {
        font-size: 1.85rem;
    }

    .hero-points,
    .book-grid,
    .category-grid,
    .process-grid,
    .trust-grid,
    .column-grid,
    .meta-grid,
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .cover-collage {
        min-height: auto;
        padding: 14px;
    }

    .collage-grid {
        display: flex;
        overflow-x: auto;
        padding-bottom: 84px;
        scroll-snap-type: x mandatory;
    }

    .collage-grid .bby-cover-crop {
        min-width: 150px;
        scroll-snap-align: start;
    }

    .collage-note {
        left: 14px;
        right: 14px;
        bottom: 14px;
        font-size: 0.88rem;
    }

    .hero-search,
    .wide-search {
        width: 100%;
    }

    .section-header,
    .result-toolbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .filter-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .detail-grid {
        padding: 16px;
    }

    .qr-stack,
    .footer-qrs {
        flex-wrap: wrap;
    }

    .buy-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 460px) {
    .hero-points,
    .book-grid,
    .category-grid,
    .process-grid,
    .trust-grid,
    .column-grid,
    .meta-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .hero h1,
    .page-hero h1 {
        font-size: 2rem;
    }

    .hero-search,
    .wide-search {
        flex-direction: column;
    }

    .search-button {
        width: 100%;
        min-height: 44px;
        border-radius: 0;
    }
}