/* ---------- 古籍清单 容器 ---------- */
.abook-front-wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 24px 20px 48px;
    font-family: var(--sans);
    color: var(--ink);
    background: var(--paper);
    min-height: 60vh;
    border-radius: var(--radius-lg);
}

/* ---------- 登录提示 ---------- */
.abook-login-prompt {
    text-align: center;
    padding: 80px 24px;
    background: var(--paper-light);
    border-radius: var(--radius-lg);
    margin-top: 32px;
    border: 1px solid var(--line-soft);
    position: relative;
    overflow: hidden;
}

.abook-login-prompt::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--cinnabar), var(--amber), var(--jade));
}

.abook-login-prompt-icon {
    font-size: 56px;
    margin-bottom: 20px;
    opacity: .8;
}

.abook-login-prompt h2 {
    margin: 0 0 10px 0;
    color: var(--ink);
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 500;
    letter-spacing: 2px;
}

.abook-login-prompt p {
    color: var(--ink-light);
    margin-bottom: 24px;
    font-size: 14px;
}

/* ---------- 搜索栏 ---------- */
.abook-search-box {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--paper-light) 0%, var(--paper-warm) 100%);
    border-radius: var(--radius);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-sm);
}

.abook-search-box input[type="text"] {
    flex: 1;
    padding: 12px 20px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    font-size: 14px;
    outline: none;
    background: var(--paper-light);
    color: var(--ink);
    font-family: var(--sans);
    transition: all .25s;
}

.abook-search-box input[type="text"]:focus {
    border-color: var(--cinnabar-soft);
    box-shadow: 0 0 0 3px rgba(168,56,46,.1);
    background: #fff;
}

.abook-search-box input[type="text"]::placeholder {
    color: var(--ink-light);
    font-style: italic;
}

/* ---------- 分类导航 ---------- */
.abook-category-nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 12px;
}

/* ---------- 树状分类布局 ---------- */
.abook-tree-layout {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.abook-tree-sidebar {
    flex: 0 0 260px;
    background: linear-gradient(180deg, var(--paper-light) 0%, var(--paper) 100%);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 120px);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

.abook-tree-header {
    padding: 14px 18px;
    font-family: var(--serif);
    font-size: 15px;
    font-weight: 600;
    color: var(--ink);
    background: linear-gradient(135deg, var(--paper-warm) 0%, var(--paper) 100%);
    border-bottom: 2px solid var(--line);
    flex: 0 0 auto;
    letter-spacing: 1px;
}

.abook-tree-body {
    overflow-y: auto;
    flex: 1;
    padding: 8px 0;
}

.abook-tree-body::-webkit-scrollbar { width: 6px; }
.abook-tree-body::-webkit-scrollbar-track { background: transparent; }
.abook-tree-body::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }
.abook-tree-body::-webkit-scrollbar-thumb:hover { background: var(--ink-light); }

.abook-tree-node {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 13px;
    color: var(--ink-soft);
    transition: all .2s;
    user-select: none;
    line-height: 1.4;
    border-left: 3px solid transparent;
}

.abook-tree-node:hover {
    background: var(--paper-warm);
    color: var(--ink);
    border-left-color: var(--cinnabar-soft);
}

.abook-tree-node.active {
    background: linear-gradient(90deg, var(--paper-warm) 0%, transparent 100%);
    color: var(--cinnabar);
    font-weight: 600;
    border-left-color: var(--cinnabar);
}

.abook-tree-node.active .abook-tree-count {
    color: var(--cinnabar);
    background: rgba(168,56,46,.1);
    font-weight: 600;
}

.abook-tree-toggle {
    flex: 0 0 16px;
    font-size: 10px;
    color: var(--ink-light);
    text-align: center;
    cursor: pointer;
    transition: transform .2s;
    line-height: 1;
}

.abook-tree-node.active .abook-tree-toggle {
    color: var(--cinnabar);
}

.abook-tree-leaf {
    flex: 0 0 16px;
    color: var(--jade);
    opacity: .6;
}

.abook-tree-label {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.abook-tree-count {
    flex: 0 0 auto;
    font-size: 11px;
    color: var(--ink-light);
    background: var(--paper-warm);
    padding: 2px 8px;
    border-radius: 10px;
    font-variant-numeric: tabular-nums;
    transition: all .2s;
}

.abook-tree-children {
    /* 由 JS 控制显示/隐藏 */
}

/* 面包屑 */
.abook-breadcrumb {
    padding: 0 0 16px;
    font-size: 13px;
    color: var(--ink-light);
    font-weight: 500;
}

.abook-crumb-sep {
    margin: 0 4px;
    color: var(--line);
}

/* 右侧内容区域 */
.abook-tree-content {
    flex: 1;
    min-width: 0;
}

/* ---------- 书籍网格容器 ---------- */
.abook-book-grid {
    margin-bottom: 28px;
}

/* 基础标签样式 */
.abook-book-cat,
.abook-book-type,
.abook-book-size {
    display: inline-block;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
}

.abook-book-cat {
    background: rgba(63,122,77,.08);
    color: var(--jade);
}

.abook-book-type {
    background: rgba(62,92,118,.08);
    color: var(--indigo);
}

.abook-book-size {
    background: rgba(184,134,11,.08);
    color: var(--amber);
}

/* ---------- 古籍列表行 ---------- */
.abook-book-grid.abook-book-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    grid-template-columns: unset;
}

.abook-book-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 18px;
    background: var(--paper-light);
    border: 1px solid var(--line-soft);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all .25s;
    position: relative;
    overflow: hidden;
}

.abook-book-row::before {
    content: "";
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--cinnabar) 0%, var(--cinnabar-soft) 100%);
    opacity: 0;
    transition: opacity .25s;
}

.abook-book-row:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
    border-color: var(--line);
}

.abook-book-row:hover::before {
    opacity: 1;
}

.abook-row-icon {
    flex: 0 0 40px;
    font-size: 28px;
    text-align: center;
    color: var(--jade);
    opacity: .7;
}

.abook-row-info {
    flex: 1;
    min-width: 0;
}

.abook-row-title {
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 6px 0;
    color: var(--ink);
    line-height: 1.4;
    font-family: var(--serif);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color .2s;
}

.abook-book-row:hover .abook-row-title {
    color: var(--cinnabar);
}

.abook-row-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.abook-row-points {
    flex: 0 0 auto;
    font-size: 13px;
    color: var(--amber);
    font-weight: 600;
    font-family: var(--serif);
    white-space: nowrap;
}

/* ---------- 详情页 ---------- */
.abook-book-detail {
    background: var(--paper-light);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    border: 1px solid var(--line-soft);
}

.abook-btn-back {
    margin-bottom: 20px;
}

.abook-detail-header h2 {
    margin: 0 0 20px 0;
    font-size: 24px;
    color: var(--ink);
    font-family: var(--serif);
    font-weight: 500;
    letter-spacing: 1px;
}

.abook-detail-info {
    margin-bottom: 20px;
}

.abook-detail-row {
    display: flex;
    padding: 10px 0;
    border-bottom: 1px solid var(--line-soft);
}

.abook-detail-row label {
    width: 100px;
    color: var(--ink-light);
    font-size: 14px;
    flex-shrink: 0;
}

.abook-detail-row span {
    color: var(--ink);
    font-size: 14px;
}

/* ---------- 下载区域 ---------- */
.abook-download-section {
    background: var(--paper-warm);
    border-radius: var(--radius);
    padding: 18px 20px;
    margin-top: 20px;
    border: 1px solid var(--line-soft);
}

.abook-download-section h3 {
    margin: 0 0 14px 0;
    color: var(--cinnabar);
    font-size: 16px;
    font-family: var(--serif);
    font-weight: 500;
}

.abook-download-section p {
    margin: 0 0 14px 0;
    font-size: 14px;
    color: var(--ink-soft);
}

.abook-download-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.abook-download-link-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background: var(--paper-light);
    border-radius: var(--radius-sm);
    border: 1px solid var(--line-soft);
    transition: border-color .2s, box-shadow .2s;
}

.abook-download-link-item:hover {
    border-color: var(--cinnabar-soft);
    box-shadow: var(--shadow-sm);
}

.abook-link-platform {
    display: inline-block;
    padding: 3px 12px;
    background: var(--ink);
    color: var(--paper);
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .5px;
}

.abook-link-code {
    font-size: 13px;
    color: var(--ink-light);
}

.abook-no-links {
    color: var(--ink-light);
    font-size: 14px;
}

.abook-points-insufficient {
    color: var(--cinnabar);
    font-weight: 600;
    font-size: 14px;
}