/* ============================================================
   图道书单 · 前端样式
   Version 0.0.1
   中文优先排版 / 双主题适配 / 响应式 5-1 列
   ============================================================ */

.td-books,
.td-books *,
.td-books *::before,
.td-books *::after {
    box-sizing: border-box;
}

.td-books {
    /* 默认亮色变量 */
    --td-books-accent:         #2958d8;
    --td-books-accent-hover:   #1e47b0;
    --td-books-accent-bg:      rgba(41, 88, 216, 0.08);
    --td-books-bg-page:        #f5f7fa;
    --td-books-bg-surface:     #ffffff;
    --td-books-bg-elevated:    #fafbfc;
    --td-books-bg-muted:       #eef1f5;
    --td-books-text-primary:   #1a1d21;
    --td-books-text-secondary: #4a4f55;
    --td-books-text-muted:     #8b9098;
    --td-books-text-on-accent: #ffffff;
    --td-books-border-subtle:  #e3e7ec;
    --td-books-border-strong:  #c7cdd4;
    --td-books-star-on:        #f4a93b;
    --td-books-star-off:       #d3d7dd;
    --td-books-danger:         #cc3636;
    --td-books-radius-sm:      6px;
    --td-books-radius-md:      8px;
    --td-books-radius-lg:      8px;
    --td-books-shadow-card:    0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06);
    --td-books-shadow-hover:   0 2px 4px rgba(16,24,40,.06), 0 4px 8px rgba(16,24,40,.08);
    --td-books-font-zh:        -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    --td-books-font-en:        -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --td-books-font-mono:      ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Consolas, monospace;

    font-family: var(--td-books-font-zh);
    color: var(--td-books-text-primary);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---------- 暗色适配（跟随站点 html.dark） ---------- */
html.dark .td-books,
html[data-theme="dark"] .td-books,
.td-books[data-theme="dark"] {
    --td-books-accent:         #6b8ef5;
    --td-books-accent-hover:   #8aa8ff;
    --td-books-accent-bg:      rgba(107,142,245,0.15);
    --td-books-bg-page:        #0f1217;
    --td-books-bg-surface:     #171b22;
    --td-books-bg-elevated:    #1d222b;
    --td-books-bg-muted:       #252b35;
    --td-books-text-primary:   #e8ebef;
    --td-books-text-secondary: #b4bbc4;
    --td-books-text-muted:     #7b838e;
    --td-books-border-subtle:  #2a303b;
    --td-books-border-strong:  #3a424f;
    --td-books-star-on:        #f4b94a;
    --td-books-star-off:       #3a424f;
}

/* ---------- 通用 ---------- */
.td-books a {
    color: var(--td-books-accent);
    text-decoration: none;
    transition: color .12s ease;
}
.td-books a:hover,
.td-books a:focus-visible {
    color: var(--td-books-accent-hover);
    text-decoration: underline;
}
.td-books *:focus-visible {
    outline: 2px solid var(--td-books-accent);
    outline-offset: 2px;
    border-radius: 3px;
}

.td-books h1, .td-books h2, .td-books h3 {
    font-family: var(--td-books-font-zh);
    color: var(--td-books-text-primary);
    letter-spacing: .01em;
}

/* ---------- 归档页版心 ---------- */
.td-books-template {
    width: min(100% - 32px, 1200px);
    margin: 22px auto 48px;
}

.td-books-archive {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.td-books-single-template {
    width: min(100% - 32px, 1200px);
    margin: 22px auto 52px;
}

@media (max-width: 767px) {
    .td-books-template,
    .td-books-single-template {
        width: min(100% - 20px, 1200px);
        margin: 14px auto 34px;
    }
}

/* ---------- 按钮 ---------- */
.td-books-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    height: 36px;
    border: 1px solid var(--td-books-border-strong);
    border-radius: var(--td-books-radius-sm);
    background: var(--td-books-bg-surface);
    color: var(--td-books-text-primary);
    font-size: 14px;
    font-weight: 500;
    line-height: 1;
    cursor: pointer;
    text-decoration: none;
    transition: background .12s ease, border-color .12s ease, color .12s ease;
    gap: 6px;
}
.td-books-btn:hover {
    background: var(--td-books-bg-elevated);
    border-color: var(--td-books-text-muted);
    color: var(--td-books-text-primary);
    text-decoration: none;
}
.td-books-btn--primary {
    background: var(--td-books-accent);
    border-color: var(--td-books-accent);
    color: var(--td-books-text-on-accent);
}
.td-books-btn--primary:hover {
    background: var(--td-books-accent-hover);
    border-color: var(--td-books-accent-hover);
    color: var(--td-books-text-on-accent);
}
.td-books-btn--icon {
    width: 36px;
    padding: 0;
    flex: 0 0 36px;
}

/* ---------- 筛选条 ---------- */
.td-books-filter-bar {
    padding: 14px;
    margin: 0 0 14px;
    background: linear-gradient(180deg, var(--td-books-bg-surface), var(--td-books-bg-elevated));
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-md);
    box-shadow: var(--td-books-shadow-card);
}
.td-books-filter-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 0 0 12px;
}
.td-books-filter-title {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding-left: 10px;
    border-left: 3px solid var(--td-books-accent);
    color: var(--td-books-text-primary);
    font-size: 16px;
    font-weight: 600;
    line-height: 1.2;
}
.td-books-filter-fields {
    display: grid;
    grid-template-columns: minmax(260px, 1.55fr) minmax(170px, .95fr) minmax(170px, .95fr) minmax(140px, .75fr) auto;
    align-items: flex-end;
    gap: 10px 12px;
}
.td-books-filter-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}
.td-books-filter-field--search {
    min-width: 220px;
}
.td-books-filter-label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
    font-size: 12px;
    color: var(--td-books-text-muted);
    font-weight: 500;
}
.td-books-filter-field input[type="text"],
.td-books-filter-field select {
    width: 100%;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-sm);
    background: var(--td-books-bg-surface);
    color: var(--td-books-text-primary);
    font-family: inherit;
    font-size: 14px;
    line-height: 1;
    transition: border-color .12s ease, background .12s ease;
}
.td-books-filter-field input[type="text"]:hover,
.td-books-filter-field select:hover {
    border-color: var(--td-books-border-strong);
}
.td-books-filter-field input[type="text"]:focus,
.td-books-filter-field select:focus {
    outline: none;
    border-color: var(--td-books-accent);
    background: var(--td-books-bg-surface);
}
.td-books-filter-input-wrap {
    position: relative;
    display: block;
}
.td-books-filter-input-wrap input[type="text"] { padding-left: 34px; }
.td-books-filter-icon {
    position: absolute;
    left: 10px; top: 50%;
    transform: translateY(-50%);
    color: var(--td-books-text-muted);
}
.td-books-filter-actions {
    display: flex;
    gap: 6px;
    align-items: flex-end;
    justify-content: flex-end;
    white-space: nowrap;
}
.td-books-filter-actions .td-books-btn--primary {
    min-width: 76px;
}

/* ---------- 工具栏（排序 + 计数） ---------- */
.td-books-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px 12px;
    margin: 0 0 16px;
    background: var(--td-books-bg-surface);
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-md);
}
.td-books-toolbar-count {
    margin: 0;
    font-size: 13px;
    color: var(--td-books-text-secondary);
}
.td-books-toolbar-count strong {
    color: var(--td-books-text-primary);
    font-variant-numeric: tabular-nums;
}
.td-books-sort {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 0;
}
.td-books-sort label {
    font-size: 13px;
    color: var(--td-books-text-muted);
}
.td-books-sort select {
    height: 34px;
    min-width: 168px;
    padding: 0 28px 0 10px;
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-sm);
    background: var(--td-books-bg-surface);
    color: var(--td-books-text-primary);
    font-family: inherit;
    font-size: 13px;
}

/* ---------- 网格 ---------- */
.td-books-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 20px;
    margin: 0 0 28px;
}
@media (max-width: 1279px) { .td-books-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (max-width: 1023px) { .td-books-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; } }
@media (max-width:  767px) { .td-books-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; } }
@media (max-width:  400px) { .td-books-grid { grid-template-columns: 1fr; } }

/* ---------- 卡片 ---------- */
.td-books-card {
    display: flex;
    flex-direction: column;
    padding: 12px;
    background: var(--td-books-bg-surface);
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-md);
    box-shadow: var(--td-books-shadow-card);
    transition: transform .15s ease, box-shadow .15s ease;
}
.td-books-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--td-books-shadow-hover);
}
.td-books-card-cover {
    display: block;
    aspect-ratio: 2/3;
    overflow: hidden;
    border-radius: var(--td-books-radius-sm);
    background: var(--td-books-bg-muted);
    position: relative;
}
.td-books-card-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .2s ease;
}
.td-books-card:hover .td-books-card-cover-img {
    transform: scale(1.02);
}
.td-books-card-cover-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    font-family: var(--td-books-font-zh);
    font-weight: 600;
    color: var(--td-books-text-muted);
    background: linear-gradient(135deg, var(--td-books-bg-elevated), var(--td-books-bg-muted));
}
.td-books-card-body {
    padding: 12px 2px 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.td-books-card-title {
    margin: 0;
    font-size: 16px;
    font-weight: 500;
    line-height: 1.3;
    color: var(--td-books-text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.6em;
}
.td-books-card-title a {
    color: inherit;
}
.td-books-card-title a:hover {
    color: var(--td-books-accent);
    text-decoration: none;
}
.td-books-card-rating {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--td-books-text-muted);
}
.td-books-card-rating-label { color: var(--td-books-text-muted); }
.td-books-card-category {
    font-size: 12px;
    color: var(--td-books-accent);
}
.td-books-card-author {
    font-size: 13px;
    color: var(--td-books-text-secondary);
    margin-top: 2px;
}
.td-books-card-author a {
    color: inherit;
}
.td-books-card-author a:hover {
    color: var(--td-books-accent);
    text-decoration: none;
}
.td-books-card-author-extra { color: var(--td-books-text-muted); font-size: 12px; }

/* ---------- 分页 ---------- */
.td-books-pagination {
    display: flex;
    justify-content: center;
    margin: 24px 0 12px;
}
.td-books-pagination ul.page-numbers {
    display: flex;
    gap: 4px;
    list-style: none;
    padding: 0;
    margin: 0;
}
.td-books-pagination li {
    margin: 0;
    padding: 0;
    list-style: none;
}
.td-books-pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-sm);
    background: var(--td-books-bg-surface);
    color: var(--td-books-text-primary);
    font-size: 14px;
    text-decoration: none;
    transition: background .12s ease, color .12s ease, border-color .12s ease;
    font-variant-numeric: tabular-nums;
}
.td-books-pagination .page-numbers:hover {
    background: var(--td-books-bg-elevated);
    color: var(--td-books-accent);
    border-color: var(--td-books-border-strong);
    text-decoration: none;
}
.td-books-pagination .page-numbers.current {
    background: var(--td-books-accent);
    color: var(--td-books-text-on-accent);
    border-color: var(--td-books-accent);
}
.td-books-pagination .page-numbers.dots {
    border-color: transparent;
    background: transparent;
}

/* ---------- 空状态 ---------- */
.td-books-empty {
    text-align: center;
    padding: 42px 20px;
    margin: 6px auto 0;
    max-width: 680px;
    background: var(--td-books-bg-surface);
    border: 1px dashed var(--td-books-border-strong);
    border-radius: var(--td-books-radius-md);
    color: var(--td-books-text-secondary);
}
.td-books-empty-icon {
    color: var(--td-books-text-muted);
    margin-bottom: 12px;
}
.td-books-empty-title {
    margin: 0 0 8px;
    font-size: 18px;
    font-weight: 500;
    color: var(--td-books-text-primary);
}
.td-books-empty-desc {
    margin: 0 0 16px;
    color: var(--td-books-text-muted);
    font-size: 14px;
}

/* ---------- 详情页 ---------- */
.td-books-detail {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 0 40px;
}

.td-books-breadcrumb {
    padding: 0 0 12px;
    font-size: 13px;
    color: var(--td-books-text-muted);
}
.td-books-breadcrumb a { color: var(--td-books-text-secondary); }
.td-books-breadcrumb a:hover { color: var(--td-books-accent); text-decoration: none; }
.td-books-breadcrumb-sep { margin: 0 6px; color: var(--td-books-text-muted); }
.td-books-breadcrumb-current { color: var(--td-books-text-primary); }

.td-books-detail-main {
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 34px;
    padding: 24px;
    background: var(--td-books-bg-surface);
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-md);
    box-shadow: var(--td-books-shadow-card);
}
@media (max-width: 767px) {
    .td-books-detail-main {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 16px;
        text-align: center;
    }
}

.td-books-detail-cover-wrap {
    position: sticky;
    top: 24px;
    align-self: start;
}
@media (max-width: 767px) {
    .td-books-detail-cover-wrap { position: static; text-align: center; }
}
.td-books-detail-cover {
    display: block;
    width: 100%;
    max-width: 300px;
    aspect-ratio: 2/3;
    overflow: hidden;
    border-radius: var(--td-books-radius-md);
    box-shadow: 0 6px 24px rgba(16,24,40,.1);
    background: var(--td-books-bg-muted);
    cursor: zoom-in;
    margin: 0 auto;
}
.td-books-detail-cover--empty {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    font-weight: 600;
    color: var(--td-books-text-muted);
    cursor: default;
}
.td-books-detail-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
html.dark .td-books-detail-cover-img { filter: brightness(.92); }

.td-books-detail-info { display: flex; flex-direction: column; }
.td-books-detail-title {
    margin: 0;
    font-size: 30px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--td-books-text-primary);
}
.td-books-detail-subtitle {
    margin: 6px 0 16px;
    font-family: var(--td-books-font-en);
    font-style: italic;
    font-size: 16px;
    color: var(--td-books-text-muted);
    font-weight: 400;
}

.td-books-meta-list {
    display: grid;
    grid-template-columns: 7em 1fr;
    column-gap: 12px;
    row-gap: 10px;
    margin: 20px 0 0;
    padding: 0;
    font-size: 14px;
}
.td-books-meta-list dt {
    color: var(--td-books-text-muted);
    font-weight: 500;
    font-size: 13px;
    margin: 0;
    text-align: right;
    padding-top: 2px;
}
@media (max-width: 767px) {
    .td-books-meta-list {
        grid-template-columns: 6em 1fr;
        text-align: left;
    }
    .td-books-meta-list dt { text-align: left; }
}
.td-books-meta-list dd { margin: 0; color: var(--td-books-text-primary); }
.td-books-meta-sep { color: var(--td-books-text-muted); margin: 0 4px; }
.td-books-meta-mono { font-family: var(--td-books-font-mono); font-size: 13px; }
.td-books-meta-en { color: var(--td-books-text-muted); font-family: var(--td-books-font-en); font-size: 13px; }
.td-books-meta-tags { line-height: 1.8; }
.td-books-douban-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 30px;
    padding: 5px 10px;
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-sm);
    background: var(--td-books-accent-bg);
    color: var(--td-books-accent);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.2;
    text-decoration: none;
}
.td-books-douban-link:hover,
.td-books-douban-link:focus-visible {
    border-color: var(--td-books-accent);
    background: var(--td-books-bg-surface);
    color: var(--td-books-accent-hover);
    text-decoration: none;
}
.td-books-douban-link svg {
    width: 14px;
    height: 14px;
    flex: 0 0 14px;
}
.td-books-tag {
    color: var(--td-books-accent);
    text-decoration: none;
    border-bottom: 1px dashed var(--td-books-border-strong);
}
.td-books-tag:hover { color: var(--td-books-accent-hover); border-bottom-color: currentColor; }
.td-books-tag-sep { color: var(--td-books-text-muted); margin: 0 6px; }

/* 摘要 */
.td-books-excerpt {
    margin: 16px 0 0;
    padding: 16px 18px;
    background: var(--td-books-bg-elevated);
    border-left: 3px solid var(--td-books-accent);
    border-radius: var(--td-books-radius-sm);
    color: var(--td-books-text-secondary);
    line-height: 1.7;
}
.td-books-excerpt::before {
    content: "/";
    margin-right: 8px;
    font-style: normal;
    font-weight: 600;
    color: var(--td-books-accent);
}
.td-books-excerpt p { margin: 0 0 8px; }
.td-books-excerpt p:last-child { margin-bottom: 0; }

/* 评分一行 */
.td-books-ratings {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px 22px;
    margin: 16px 0 0;
    padding: 14px 18px;
    background: var(--td-books-bg-surface);
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-md);
    font-size: 14px;
}
.td-books-ratings--hero {
    align-items: flex-start;
    margin-top: 28px;
    padding: 14px 16px;
    background: var(--td-books-bg-elevated);
    border-color: var(--td-books-border-subtle);
}
.td-books-rating-item { display: inline-flex; align-items: center; gap: 6px; }
.td-books-rating-label { color: var(--td-books-text-muted); font-size: 13px; }
.td-books-read-time { color: var(--td-books-text-primary); font-variant-numeric: tabular-nums; }

.td-books-content-panel {
    margin: 16px 0 0;
    padding: 22px 24px;
    background: var(--td-books-bg-surface);
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-md);
}
.td-books-section-title {
    margin: 0 0 14px;
    padding-left: 12px;
    border-left: 3px solid var(--td-books-accent);
    font-size: 18px;
    font-weight: 600;
    line-height: 1.35;
}

/* 读后感正文 */
.td-books-content {
    margin: 0;
    font-size: 15px;
    line-height: 1.85;
    color: var(--td-books-text-primary);
    letter-spacing: .01em;
    overflow-wrap: break-word;
    word-break: break-word;
}
.td-books-content p {
    margin: 1em 0;
    text-indent: 2em;
}
.td-books-content p:first-child { margin-top: 0; text-indent: 0; }
.td-books-content p:last-child { margin-bottom: 0; }
.td-books-content h2, .td-books-content h3, .td-books-content h4 {
    margin: 1.6em 0 .6em;
    line-height: 1.4;
    font-weight: 600;
}
.td-books-content h2 { font-size: 20px; }
.td-books-content h3 { font-size: 17px; }
.td-books-content blockquote {
    margin: 1.5em 0;
    padding: 8px 16px;
    border-left: 3px solid var(--td-books-accent);
    background: var(--td-books-bg-elevated);
    color: var(--td-books-text-secondary);
    font-style: italic;
}
.td-books-content blockquote p { text-indent: 0; }
.td-books-content ul, .td-books-content ol { padding-left: 2em; }
.td-books-content li { margin: .3em 0; }
.td-books-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--td-books-radius-sm);
    margin: 1em 0;
}
.td-books-content a { color: var(--td-books-accent); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.td-books-content a:hover { color: var(--td-books-accent-hover); }
.td-books-content pre, .td-books-content code {
    font-family: var(--td-books-font-mono);
    font-size: 13px;
}
.td-books-content pre {
    padding: 12px 16px;
    background: var(--td-books-bg-elevated);
    border-radius: var(--td-books-radius-sm);
    overflow-x: auto;
}
.td-books-content hr {
    border: 0;
    border-top: 1px solid var(--td-books-border-subtle);
    margin: 2em 0;
}

/* ---------- 相关推荐（横向滚动） ---------- */
.td-books-related {
    margin: 16px 0 0;
    padding: 22px 24px;
    background: var(--td-books-bg-surface);
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-md);
}
.td-books-related-title {
    margin: 0 0 16px;
    font-size: 18px;
    font-weight: 600;
    color: var(--td-books-text-primary);
    padding-left: 12px;
    border-left: 3px solid var(--td-books-accent);
}
.td-books-related-wrap {
    position: relative;
}
.td-books-related-scroller {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    padding: 4px 2px 16px;
    -ms-overflow-style: none;
    scrollbar-width: thin;
}
.td-books-related-scroller::-webkit-scrollbar { height: 6px; }
.td-books-related-scroller::-webkit-scrollbar-track { background: var(--td-books-bg-elevated); }
.td-books-related-scroller::-webkit-scrollbar-thumb { background: var(--td-books-border-strong); border-radius: 3px; }

.td-books-related-card {
    flex: 0 0 160px;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    background: var(--td-books-bg-surface);
    border: 1px solid var(--td-books-border-subtle);
    border-radius: var(--td-books-radius-sm);
    text-decoration: none;
    color: var(--td-books-text-primary);
    transition: transform .15s ease, box-shadow .15s ease;
}
.td-books-related-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--td-books-shadow-card);
    text-decoration: none;
    color: var(--td-books-text-primary);
}
.td-books-related-cover {
    display: block;
    aspect-ratio: 2/3;
    overflow: hidden;
    border-radius: 4px;
    background: var(--td-books-bg-muted);
    position: relative;
}
.td-books-related-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.td-books-related-cover--empty {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--td-books-text-muted);
    font-weight: 600;
}
.td-books-related-title-text {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 13px;
    line-height: 1.3;
    min-height: 2.6em;
    margin-top: 4px;
}
.td-books-related-cat, .td-books-related-author {
    font-size: 12px;
    color: var(--td-books-text-muted);
}

.td-books-related-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border: 1px solid var(--td-books-border-subtle);
    border-radius: 50%;
    background: var(--td-books-bg-surface);
    color: var(--td-books-text-primary);
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--td-books-shadow-card);
    transition: background .12s ease;
    z-index: 2;
}
.td-books-related-nav:hover { background: var(--td-books-accent); color: var(--td-books-text-on-accent); border-color: var(--td-books-accent); }
.td-books-related-nav--prev { left: -18px; }
.td-books-related-nav--next { right: -18px; }
.td-books-related-nav[disabled] { opacity: .3; cursor: not-allowed; }
@media (max-width: 767px) {
    .td-books-related-nav { display: none; }
    .td-books-related-card { flex-basis: 130px; }
}

.td-books-related-empty {
    padding: 20px 0;
    color: var(--td-books-text-muted);
    font-size: 14px;
}

/* 详情页返回按钮区 */
.td-books-detail-footer {
    padding: 22px 0 0;
    text-align: center;
    margin-top: 0;
}
.td-books .td-books-detail-footer .td-books-btn--primary {
    min-width: 128px;
    color: var(--td-books-text-on-accent) !important;
    font-weight: 600;
    text-decoration: none !important;
}
.td-books .td-books-detail-footer .td-books-btn--primary:hover,
.td-books .td-books-detail-footer .td-books-btn--primary:focus-visible {
    color: var(--td-books-text-on-accent) !important;
    text-decoration: none !important;
}

/* ---------- 星级 SVG ---------- */
.td-books-stars { display: inline-flex; align-items: center; gap: 1px; line-height: 1; }
.td-books-stars--sm { font-size: 14px; }
.td-books-stars--md { font-size: 18px; }
.td-books-stars--lg { font-size: 22px; }
.td-books-star { width: 1em; height: 1em; fill: var(--td-books-star-off); }
.td-books-star--on { fill: var(--td-books-star-on); }
.td-books-star--half .td-books-star-bg { fill: var(--td-books-star-off); }
.td-books-star--half .td-books-star-fg { fill: var(--td-books-star-on); }

/* ---------- Lightbox ---------- */
.td-books-lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    display: grid;
    place-items: center;
    z-index: 9999;
    cursor: zoom-out;
    opacity: 0;
    transition: opacity .15s ease;
    padding: 4vh 4vw;
}
.td-books-lightbox-overlay.is-open { opacity: 1; }
.td-books-lightbox-img {
    max-width: 90vw;
    max-height: 90vh;
    box-shadow: 0 20px 60px rgba(0,0,0,.6);
    border-radius: 4px;
    transition: transform .2s ease;
}
.td-books-lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,.15);
    border: 0;
    border-radius: 50%;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.td-books-lightbox-close:hover { background: rgba(255,255,255,.3); }

/* ---------- 打印样式 ---------- */
@media print {
    .td-books-filter-bar,
    .td-books-pagination,
    .td-books-related,
    .td-books-lightbox-overlay,
    .td-books-detail-footer,
    .td-books-breadcrumb {
        display: none !important;
    }
    .td-books-detail { max-width: 100%; padding: 0; }
    .td-books-content { font-size: 12pt; line-height: 1.5; }
    .td-books-detail-cover { max-width: 4cm; box-shadow: none; }
    .td-books a { color: inherit; text-decoration: none; }
    .td-books a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

@media (max-width: 1160px) {
    .td-books-filter-fields {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .td-books-filter-field--search {
        grid-column: span 2;
    }
    .td-books-filter-actions {
        justify-content: flex-start;
    }
}

@media (max-width: 767px) {
    .td-books-filter-bar {
        padding: 12px;
    }
    .td-books-filter-head,
    .td-books-toolbar {
        align-items: flex-start;
        flex-direction: column;
    }
    .td-books-filter-fields {
        grid-template-columns: 1fr;
    }
    .td-books-filter-field--search {
        grid-column: auto;
        min-width: 0;
    }
    .td-books-filter-actions {
        width: 100%;
    }
    .td-books-filter-actions .td-books-btn--primary {
        flex: 1 1 auto;
    }
    .td-books-sort {
        width: 100%;
    }
    .td-books-sort select {
        width: 100%;
    }
}

/* ---------- 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
    .td-books *,
    .td-books *::before,
    .td-books *::after {
        animation-duration: .001ms !important;
        transition-duration: .001ms !important;
    }
}

/* ---------- 最新/推荐快捷布局 ---------- */
.td-books-latest--row,
.td-books-recommend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}
.td-books-latest--row > *,
.td-books-recommend > * {
    flex: 0 0 140px;
}
.td-books-latest--grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}