/* ===== READER FINAL — 单一权威排版层 =====
 * 置于 reader.css 之后加载，承载全部"最终值"。
 * 旧 reader.css 的多代覆盖层(基础/WeRead/JOBS/PREMIUM)被此层统一，
 * 消除"同一属性被 !important 重写 4-6 次"导致的排版漂移与主题双轨翻车。
 * 允许在此用 !important（这是唯一允许的文件），旧层逐步清理。
 */

/* ---- P0-1 阅读排版统一 ---- */
.reader-shell .chapter-content.markdown-body,
.chapter-content.markdown-body {
    font-size: calc(var(--font-size-reader, clamp(17px, 1.05vw + 10px, 19px)) * var(--reader-font-scale, 1)) !important;   /* 阅读正文 = token × Aa缩放 */
    line-height: var(--reader-line-height, 1.9) !important;   /* 行距 = Aa 设置变量 */
    letter-spacing: .012em !important;                          /* 中文微开字距，去拥挤 */
    text-align: left !important;                               /* 干掉 justify 的"河流"毛刺 */
    text-justify: none !important;
    hanging-punctuation: allow-end;                            /* 标点悬挂 */
    text-autospace: ideograph-alpha ideograph-numeric;         /* 中西文混排自动留隙(Chrome 140+，其余浏览器忽略) */
    color: var(--ink, #2b2620) !important;
}

/* 段落：首行缩进 + 段间距统一
   只作用于容器直接子级——marked 松散列表的 <li><p> 与 <blockquote><p>
   曾被后代选择器误中(叠加 2em 缩进 + 双重段距)，2026-08-14 收敛。 */
.reader-shell .chapter-content.markdown-body > p,
.chapter-content.markdown-body > p {
    margin: 0 0 .9em !important;
    text-indent: 2em !important;
}

/* 缩进规则补全：标题/引用/代码/列表之后的首段不缩进 */
.reader-shell .chapter-content.markdown-body > :is(h1,h2,h3,h4)+p,
.chapter-content.markdown-body > :is(h1,h2,h3,h4)+p,
.reader-shell .chapter-content.markdown-body > blockquote+p,
.chapter-content.markdown-body > blockquote+p,
.reader-shell .chapter-content.markdown-body > pre+p,
.chapter-content.markdown-body > pre+p {
    text-indent: 0 !important;
}

/* Mermaid 图表彻底隔离：正文排版 CSS(text-indent/margin/line-height/letter-spacing
   等)会通过继承泄漏进 mermaid v11 foreignObject 内的 HTML 标签。
   这里一次性重置所有可能泄漏的排版属性，不再逐条打地鼠。 */
.reader-shell .chapter-content.markdown-body .mermaid-container :is(p, span, div) {
    text-indent: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    line-height: normal !important;
    letter-spacing: normal !important;
    word-spacing: normal !important;
    text-align: center !important;
    text-justify: none !important;
    hanging-punctuation: none !important;
    text-wrap: normal !important;
}

/* 去掉文档感下划线（h2 的 border-bottom） */
.reader-shell .chapter-content.markdown-body :is(h1,h2),
.chapter-content.markdown-body :is(h1,h2) {
    border-bottom: none !important;
}

/* ---- P0-3 章节头：书页扉页感（放大章题，去 mono 印章） ---- */
.reader-shell .chapter-header,
.chapter-header {
    margin: 0 0 2.4em !important;
    padding-bottom: 1.4em !important;
    border-bottom: none !important;
}
.reader-shell .chapter-number-display,
.chapter-number-display {
    font-family: var(--serif) !important;
    font-style: italic !important;
    font-size: .95rem !important;
    letter-spacing: .04em !important;
    color: var(--ink-mute, #8a8378) !important;
    margin-bottom: 10px !important;
}
.reader-shell .chapter-number-display::before,
.chapter-number-display::before {
    display: none !important;  /* 去掉横线印章感 */
}
.reader-shell .chapter-title-display,
.chapter-title-display {
    font-size: clamp(1.8rem, 3.4vw, 2.4rem) !important;
    font-weight: 600 !important;
    line-height: 1.22 !important;
    letter-spacing: -.02em !important;
}

/* ---- 移动端正文统一（消除 4 次覆盖的字号死规则） ---- */
@media (max-width: 768px) {
    .reader-shell .chapter-content.markdown-body,
    .chapter-content.markdown-body {
        font-size: calc(var(--font-size-reader-mobile, clamp(16.5px, 4.5vw, 17.5px)) * var(--reader-font-scale, 1)) !important;
    }
}

/* ---- P1-2 工具栏减负：主题已收进 Aa 面板（底部 sheet），语言留在工具栏 ---- */
@media (min-width: 901px) {
    .reader-shell .header-toolbar .toolbar-settings {
        display: flex !important;
    }
    .reader-shell .header-toolbar .toolbar-settings .theme-segmented {
        display: none !important;
    }
}
.chapter-end-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    /* 底部安全区：全面屏手势条不再压住「下一章」。
       旧规则把 env(safe-area-inset-bottom) 打在不存在的 .navigation 上（已清理） */
    margin: 4em auto calc(2em + env(safe-area-inset-bottom, 0px));
    max-width: var(--reader-content-max, 40rem);
}
.chapter-end-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
    padding: 18px 20px;
    background: var(--paper-2, #f7f4ef);
    border: 1px solid var(--line, #e5dfd4);
    border-radius: var(--radius, 14px);
    cursor: pointer;
    text-align: left;
    transition: border-color .2s, transform .2s, box-shadow .2s;
    font-family: inherit;
}
.chapter-end-next { align-items: flex-end; text-align: right; }
.chapter-end-kicker {
    font-family: var(--ui-sans, system-ui);
    font-size: .66rem;
    font-weight: 600;
    letter-spacing: .08em;
    color: var(--ink-mute, #8a8378);
    text-transform: uppercase;
}
.chapter-end-title {
    font-family: var(--serif, Georgia);
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--ink, #2b2620);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.chapter-end-btn:hover:not(:disabled) {
    border-color: var(--accent, #b8893e);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px -8px rgba(30, 23, 10, .2);
}
.chapter-end-btn:disabled {
    opacity: .35;
    cursor: default;
}
@media (max-width: 600px) {
    .chapter-end-nav { grid-template-columns: 1fr; gap: 10px; }
    .chapter-end-next { align-items: flex-start; text-align: left; }
}

/* ---- P1-3 封面页操作行：收藏/下载 chip（微信读书式，主操作落在书的身份页） ---- */
.cover-action-row {
    display: flex;
    justify-content: center;
    gap: 26px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid color-mix(in srgb, var(--line, #e5dfd4) 60%, transparent);
}
.cover-action-chip {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px 6px;
    font-family: var(--ui-sans, system-ui);
    font-size: .84rem;
    font-weight: 500;
    color: var(--ink-soft, #6b6459);
    transition: color .15s;
}
.cover-action-chip:hover { color: var(--accent, #b8893e); }
.cover-action-chip.is-favorite { color: var(--accent, #b8893e); }
.cover-action-chip .icon { width: 17px; height: 17px; display: inline-flex; }
.cover-action-chip .icon svg { width: 17px; height: 17px; }

/* 封面页删除链：弱化 danger 文字，hover 才转实色 */
.cover-danger-link {
    display: block;
    margin: 34px auto 0;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: var(--ui-sans, system-ui);
    font-size: .74rem;
    color: color-mix(in srgb, #c0392b 45%, transparent);
    letter-spacing: .04em;
    transition: color .15s;
}
.cover-danger-link:hover { color: #c0392b; }


/* 封面元数据中的生成模型：低调标识（读者想了解书的来历） */
.cover-model {
    color: var(--ink-mute, #8a8378);
}


/* ---- P1-2 工具栏减负：主题收进 Aa sheet，桌面隐藏工具栏主题 ---- */
@media (min-width: 901px) {
    .reader-shell .header-toolbar .toolbar-settings .theme-segmented {
        display: none !important;
    }
}

/* ==== Aa 阅读设置 · 锚定 Aa 按钮的 pop-over（2026-08-15 重塑）====
   旧版固定右下（bottom:24px）与新底部进度条（bottom:14px 中央）同带拥挤；
   改为从顶部工具栏 Aa 按钮下方浮现（WeRead 网页版同款锚定式），
   底部整条留给进度条。移动端维持底部 sheet。 */
.aa-backdrop {
    position: fixed; inset: 0;
    background: transparent;
    opacity: 0; pointer-events: none;
    z-index: 998;
}
.aa-backdrop.open { opacity: 1; pointer-events: auto; }
.aa-menu {
    display: block;
    position: fixed;
    top: 58px; right: 20px; bottom: auto; left: auto;
    width: 320px;
    max-width: calc(100vw - 32px);
    padding: 18px 20px 12px;
    border-radius: 14px;
    border: 1px solid var(--line, #e5dfd4);
    background: var(--paper-2, #fbf8f2);
    box-shadow: var(--shadow-md, 0 12px 28px -10px rgba(30,23,10,.18));
    opacity: 0;
    transform: translateY(-6px) scale(.98);
    transform-origin: top right;
    pointer-events: none;
    transition: opacity .18s ease, transform .18s cubic-bezier(.2,.8,.2,1);
    z-index: 999;
}
.aa-menu.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}
@media (max-width: 600px) {
    .aa-menu { top: auto; right: 0; left: 0; bottom: 0; width: auto; max-width: none; border-radius: 16px 16px 0 0; transform: translateY(12px); transform-origin: bottom center; }
}
.aa-menu .aa-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.aa-menu .aa-row:last-of-type { margin-bottom: 6px; }
.aa-menu .aa-label {
    display: block; flex: none; margin: 0;
    font: 600 .74rem/1 var(--ui-sans, system-ui);
    letter-spacing: .05em;
    color: var(--ink-mute, #8a8378);
}
.aa-menu .aa-step { display: flex; align-items: center; gap: 0; border: 1px solid var(--line, #e5dfd4); border-radius: 999px; overflow: hidden; background: var(--paper, #fbf8f2); }
.aa-menu .aa-step-btn {
    width: 40px; height: 32px; flex: none;
    border: none; border-radius: 0;
    background: transparent;
    color: var(--ink, #2b2620);
    font-size: .82rem; cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center;
    transition: background .15s, color .15s, opacity .15s;
}
.aa-menu .aa-step-btn:hover:not(:disabled) { background: var(--paper-3, #f1ece2); color: var(--accent, #b8893e); }
.aa-menu .aa-step-btn:disabled { opacity: .3; cursor: default; }
.aa-menu .aa-step-btn + .aa-step-btn { border-left: 1px solid var(--line, #e5dfd4); }
.aa-menu .aa-step-val { min-width: 58px; text-align: center; font-size: .8rem; font-weight: 600; color: var(--ink, #2b2620); font-variant-numeric: tabular-nums; }
.aa-menu .aa-theme-dots { display: flex; align-items: center; gap: 12px; }
.aa-menu .theme-dot {
    width: 32px; height: 32px; flex: none;
    border-radius: 50%;
    border: 2px solid transparent;
    background: transparent; padding: 2px; cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center;
    transition: border-color .15s, transform .15s;
}
.aa-menu .theme-dot:hover { transform: scale(1.06); }
.aa-menu .theme-dot-swatch { width: 100%; height: 100%; border-radius: 50%; display: block; box-shadow: inset 0 0 0 1px rgba(0,0,0,.1); }
.aa-menu .theme-dot.active { border-color: var(--accent, #b8893e); }
.aa-menu .aa-reset {
    display: block; width: 100%;
    margin: 4px 0 0; padding: 9px 0 1px;
    border: none; border-top: 1px solid var(--line, #e5dfd4);
    background: none;
    font-size: .72rem; color: var(--ink-mute, #8a8378);
    cursor: pointer; text-align: center;
}
.aa-menu .aa-reset:hover { color: var(--accent, #b8893e); }
.aa-menu .aa-focus-btn {
    display: flex; align-items: center; justify-content: center; gap: 6px;
    width: 100%; margin: 0; padding: 9px 0 8px;
    border: none; border-top: 1px solid var(--line, #e5dfd4);
    background: none;
    font: 600 .72rem/1 var(--ui-sans, var(--sans));
    color: var(--ink-soft, #5f584c);
    cursor: pointer;
}
.aa-menu .aa-focus-btn:hover { color: var(--accent, #b8893e); }
.aa-menu .aa-focus-btn kbd {
    font: 600 9.5px/1 var(--ui-sans, var(--sans));
    padding: 2px 5px; border-radius: 4px;
    border: 1px solid var(--line-strong, #d5ccbc);
    color: var(--ink-mute, #8a8378);
}

/* ---- 专注模式：一切 chrome 退场，纯内容（F 进入 / Esc·F 退出） ---- */
body.reader-focus .reader-shell .header { transform: translateY(-110%) !important; }
body.reader-focus #readerBottomBar { transform: translateY(100%) !important; }
#focusToast {
    position: fixed; left: 50%; bottom: 34px; transform: translateX(-50%);
    z-index: 120; padding: 8px 16px; border-radius: 999px;
    background: color-mix(in srgb, var(--ink) 82%, transparent);
    color: var(--paper-2);
    font: 500 12px/1.4 var(--ui-sans, var(--sans));
    letter-spacing: .02em;
    opacity: 0; pointer-events: none;
    transition: opacity .25s ease;
}
#focusToast.show { opacity: 1; }


/* ===== 图表（Mermaid + PlantUML）—— 唯一样式源 =====
 * 所有图表 CSS 从 reader.css 迁入此处，一个选择器只出现一次。
 * reader.css 中的旧规则已删除，此层为唯一权威。
 */

/* ── 容器外壳 ── */
.reader-shell .chapter-content.markdown-body .diagram-block {
    margin: 1em 0;
    overflow: hidden;
    border: 1px solid var(--reader-border, var(--border-color));
    border-radius: 14px;
    background: var(--reader-surface, var(--bg-elevated));
    box-shadow: 0 8px 18px rgba(89, 69, 42, 0.08);
    max-width: 100%;
}
.dark .diagram-block {
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.32);
}

/* ── 工具栏 ── */
.diagram-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    background: var(--reader-surface-soft, var(--bg-secondary));
    border-bottom: 1px solid var(--reader-border, var(--border-color-light));
}
.diagram-tabs { display: flex; gap: var(--spacing-2); min-width: 0; }
.diagram-tab {
    border: 1px solid var(--reader-border, var(--border-color));
    background: var(--reader-surface, var(--bg-elevated));
    color: var(--reader-text-muted, var(--text-secondary));
    border-radius: var(--radius-full);
    min-height: 32px;
    padding: 0 var(--spacing-3);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.diagram-tab:hover {
    border-color: var(--reader-accent, var(--color-primary));
    color: var(--reader-text, var(--text-primary));
}
.diagram-tab.is-active {
    background: var(--reader-accent, var(--color-primary));
    border-color: var(--reader-accent, var(--color-primary));
    color: #fff;
}

/* ── 复制按钮 ── */
.diagram-copy-btn {
    border: 1px solid var(--reader-border, var(--border-color));
    background: var(--reader-surface, var(--bg-elevated));
    color: var(--reader-text-muted, var(--text-secondary));
    border-radius: var(--radius-full);
    min-height: 32px;
    padding: 0 var(--spacing-3);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.diagram-copy-btn:hover {
    color: var(--reader-text, var(--text-primary));
    border-color: var(--reader-accent, var(--color-primary));
    background: color-mix(in srgb, var(--reader-accent, #0f6cff) 14%, transparent);
}
.diagram-copy-btn.is-copied {
    color: var(--color-white, #fff);
    border-color: var(--color-primary, #0f6cff);
    background: var(--color-primary, #0f6cff);
}

/* ── 渲染区 / 源码切换 ── */
.diagram-rendered { padding: 0; }
.diagram-block.show-source .diagram-rendered { display: none; }
.diagram-block.show-source .diagram-source { display: block; }
.markdown-body .diagram-source {
    display: none; margin: 0;
    padding: var(--spacing-4);
    background: var(--reader-surface-soft, var(--bg-secondary));
    border-top: 1px solid var(--reader-border, var(--border-color-light));
    overflow-x: auto;
}
.markdown-body .diagram-source code {
    display: block;
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    white-space: pre;
    color: var(--text-primary);
    background: transparent; padding: 0; border-radius: 0;
}

/* ── Mermaid 容器 ── */
.reader-shell .chapter-content.markdown-body .mermaid-container {
    overflow-x: auto;
    overflow-y: visible;
    -webkit-overflow-scrolling: touch;
    text-align: center;
    padding: 0;
}
.reader-shell .chapter-content.markdown-body .mermaid-container svg {
    display: block;
    width: auto;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
}

/* ── PlantUML 容器 ── */
.reader-shell .chapter-content.markdown-body .diagram-block .plantuml-container {
    margin: 0; border: none; border-radius: 0;
    background: transparent; padding: 0;
    text-align: center; overflow-x: auto;
    max-width: 100%;
}
.plantuml-container svg {
    max-width: 100%; height: auto; display: block; margin: 0 auto;
}
.plantuml-loading {
    color: var(--text-secondary); font-style: italic;
    padding: var(--spacing-5);
}
.plantuml-error {
    background: var(--color-warning-bg);
    border: 1px solid var(--color-warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-4); margin: var(--spacing-4) 0;
    color: var(--color-alert-caution-text);
    font-family: var(--font-family-mono);
    white-space: pre-wrap; word-break: break-all;
}
.reader-shell .plantuml-container { cursor: zoom-in; }

/* ── CSS 隔离：阻止正文排版泄漏进图表 ──
 * mermaid v11 htmlLabels 把标签渲染成 foreignObject 里的 <p>/<span>/<div>，
 * 会继承正文的 text-indent:2em / margin / line-height 等。
 * 一次重置所有可泄漏属性，不再逐条打地鼠。 */
.reader-shell .chapter-content.markdown-body .mermaid-container :is(p, span, div) {
    text-indent: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    line-height: normal !important;
    letter-spacing: normal !important;
    word-spacing: normal !important;
    text-align: center !important;
    text-justify: none !important;
    hanging-punctuation: none !important;
    text-wrap: normal !important;
}
/* SVG text/tspan 模式（PlantUML + mermaid 非 htmlLabels 回退） */
.reader-shell .mermaid-container svg text,
.reader-shell .mermaid-container svg tspan,
.reader-shell .plantuml-container svg text,
.reader-shell .plantuml-container svg tspan {
    letter-spacing: 0 !important;
    word-spacing: 0 !important;
}

/* ── 点击放大 overlay ── */
.diagram-overlay {
    position: fixed; inset: 0; z-index: 9999;
    background: rgba(0,0,0,.82);
    display: none;
    align-items: flex-start; justify-content: center;
    padding: 40px 20px; overflow: auto; cursor: zoom-out;
    -webkit-overflow-scrolling: touch;
}
.diagram-overlay.active { display: flex; }
.diagram-overlay svg {
    max-width: none; width: auto; height: auto;
    background: #fff; border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.diagram-overlay-hint {
    position: fixed; bottom: 20px; left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,.6);
    font-family: var(--ui-sans); font-size: .76rem;
    pointer-events: none;
}

/* ── 错误卡片 ── */
.reader-shell .diagram-error-card {
    padding: 18px; border-radius: 16px;
    border: 1px solid color-mix(in srgb, var(--err, #B23A2E) 22%, var(--reader-border, #e8dcc8));
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--reader-surface, #fffdf5) 94%, #fff), color-mix(in srgb, var(--err, #B23A2E) 6%, transparent)),
        var(--reader-surface, #fffdf5);
    color: var(--reader-text, #2c2416);
}
.reader-shell .diagram-error-eyebrow {
    font-family: var(--lux-mono); font-size: 10px;
    letter-spacing: 0.22em; text-transform: uppercase;
    color: color-mix(in srgb, var(--err, #B23A2E) 82%, var(--reader-text-secondary, #7a6e5d));
    margin-bottom: 8px;
}
.reader-shell .diagram-error-title {
    font-family: var(--lux-serif); font-size: 1rem;
    font-weight: 600; margin-bottom: 8px;
}
.reader-shell .diagram-error-note {
    font-size: 0.94rem; line-height: 1.65;
    color: var(--reader-text-secondary, #7a6e5d);
}
.reader-shell .diagram-error-details {
    margin: 10px 0; padding: 10px 12px; border-radius: 12px;
    background: rgba(0, 0, 0, 0.04);
    font-family: var(--lux-mono); font-size: 12px;
    line-height: 1.55; color: var(--reader-text, #2c2416);
    word-break: break-word;
}
.reader-shell .diagram-render-failed .diagram-tab[data-diagram-view-btn="rendered"] {
    color: color-mix(in srgb, var(--err, #B23A2E) 82%, var(--reader-text-secondary, #7a6e5d));
}

/* ── 移动端 ── */
@media (max-width: 768px) {
    .diagram-toolbar { flex-wrap: wrap; justify-content: stretch; padding: var(--spacing-2); }
    .diagram-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-2); width: 100%; }
    .diagram-tab { min-height: 44px; font-size: var(--font-size-sm); }
    .diagram-copy-btn { width: 100%; min-height: 44px; font-size: var(--font-size-sm); }
    .reader-shell .diagram-error-card { padding: 16px; border-radius: 16px; }
}

/* ============================================================
   P0-4 目录侧栏 · 微信读书式停靠密排（2026-08-14，唯一权威层）
   此前侧栏是「圆角浮卡」+ 四代行距规则叠加（实测行距 48px vs 行高 38px，
   藏着 10px 幽灵间距）。复刻 WeRead：整高停靠栏、38px 单行密排、
   左侧 2px 指示条、数字右对齐等宽、标题单行省略。
   行样式全局生效（2026-08-15 密排下沉抽屉）；仅停靠定位留在 ≥769px。
   ============================================================ */
@media (min-width: 769px) {
    /* 容器列宽 260 → 280（WeRead 阅读密度） */
    .reader-shell .reader-container {
        grid-template-columns: 280px minmax(0, 1fr) !important;
    }
    /* 停靠栏：去浮卡化——整高、贴顶、仅右侧发丝线 */
    .reader-shell .sidebar {
        position: sticky;
        top: 0 !important;
        height: 100vh !important;
        max-height: 100vh !important;
        margin: 0 !important;
        padding: 0 !important;
        border: 0 !important;
        border-right: 1px solid var(--line) !important;
        border-radius: 0 !important;
        box-shadow: none !important;
        background: var(--paper-2);
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }
}
/* ---- 密排语言全局化（2026-08-15）：行样式对桌面停靠栏与移动抽屉一视同仁。
   此前只在 ≥769px 生效，≤768px 抽屉回落到 44px 圆角卡 + 6px 间距 + 可换行
   标题的松散形态（用户实测「太松散」的根因）。 ---- */
/* 头部：tabs + 关闭，单行 44px */
.reader-shell .sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 44px;
    padding: 0 10px 0 14px !important;
    margin: 0 !important;
    border-bottom: 1px solid var(--line) !important;
    background: transparent !important;
}
.reader-shell .sidebar-close-btn {
    width: 32px;
    height: 32px;
    margin: 0 !important;
    border: 0 !important;
    border-radius: var(--radius-sm) !important;
    background: transparent !important;
    color: var(--ink-mute);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.reader-shell .sidebar-close-btn:hover { background: var(--paper-3); color: var(--ink); }
/* 搜索框：紧贴 tabs，压掉上下 padding */
.reader-shell .toc-search-wrap { padding: 7px 12px !important; border-bottom: 1px solid var(--line); }
/* 书名条已删除（2026-08-15）：书名常驻阅读器顶栏，侧栏不再重复，
   搜索框直接贴列表——微信读书抽屉结构 */
/* 列表本体：零间距密排 + 独立滚动 */
.reader-shell .chapter-list {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
    gap: 0 !important;
    padding: 4px 0 24px !important;
    margin: 0 !important;
    scrollbar-width: thin;
    scrollbar-color: color-mix(in srgb, var(--ink-mute) 40%, transparent) transparent;
}
/* 行：38px 单行，数字右对齐 + 标题省略（桌面与抽屉同语言） */
.reader-shell .chapter-item {
    display: flex !important;
    grid-template-columns: none !important;
    align-items: center !important;
    height: 38px;
    min-height: 38px !important;
    max-height: 38px;
    margin: 0 !important;
    padding: 0 12px 0 14px !important;
    gap: 10px;
    border: 0 !important;
    border-left: 2px solid transparent !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    background: transparent !important;
    transform: none !important;
    cursor: pointer;
}
.reader-shell .chapter-item:hover {
    background: var(--paper-3) !important;
    border-left-color: transparent !important;
}
.reader-shell .chapter-item.active {
    background: var(--accent-soft) !important;
    border-left-color: var(--accent) !important;
}
.reader-shell .chapter-number {
    flex: none;
    width: 2.4em;
    margin: 0 !important;
    padding: 0 !important;
    background: transparent !important;
    border: 0 !important;
    border-radius: 0 !important;
    font-family: var(--ui-sans, var(--sans)) !important;
    font-size: 11px !important;
    font-weight: 600;
    line-height: 1 !important;
    font-variant-numeric: tabular-nums;
    text-align: right;
    color: var(--ink-mute);
}
.reader-shell .chapter-item.active .chapter-number {
    color: var(--accent);
    background: transparent !important;
}
.reader-shell .chapter-title {
    font-family: var(--ui-sans, var(--sans)) !important;
    font-size: 13.5px !important;
    font-weight: 400 !important;
    line-height: 1.25 !important;
    color: var(--ink-soft);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
    -webkit-line-clamp: unset !important;
    -webkit-box-orient: initial !important;
    min-width: 0;
}
.reader-shell .chapter-item.active .chapter-title {
    color: var(--accent);
    font-weight: 600 !important;
}
.reader-shell .chapter-item.failed { opacity: .5; }

/* ============================================================
   P0-5 阅读器首部压缩 + 双竖线修复（2026-08-14）
   ============================================================ */
/* 目录行旧代际的绝对定位指示条 ::before 与新 border-left 叠加成双竖线——全部废止 */
.reader-shell .chapter-item::before,
.reader-shell .chapter-item.active::before,
.reader-shell .chapter-item.active::after { content: none !important; display: none !important; }

/* 章节头压缩：微信读书的章节头是轻量的一小块 */
.reader-shell .chapter-header,
.chapter-header {
    margin: 0 0 1.1em !important;
    padding-bottom: .55em !important;
}
.reader-shell .chapter-number-display,
.chapter-number-display {
    font-size: .78rem !important;
    margin-bottom: 4px !important;
}

/* 阅读区去卡化：正文直接落在纸面上（WeRead 无卡片容器）+ 顶距压缩 */
.reader-shell .content-area {
    background: transparent !important;
    border: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    padding: clamp(18px, 2.6vw, 34px) clamp(18px, 3vw, 44px) 78px !important;
    min-height: 60vh;
}
.reader-shell .reader-container {
    padding-top: clamp(10px, 1.6vw, 20px) !important;
}
.reader-shell .header-toolbar { min-height: 46px; }

/* ---- 工具栏自动隐藏（滚动向下沉浸，向上唤回） ---- */
.reader-shell .header {
    transition: transform .28s cubic-bezier(.4, 0, .2, 1);
    will-change: transform;
}
.reader-shell.reader-chrome-hidden .header,
body.reader-chrome-hidden .reader-shell .header { transform: translateY(-110%); }

/* ============================================================
   P0-6 底部进度条（微信读书式：上一章 | 滑杆 | 下一章）— 仅桌面
   ============================================================ */
/* ============================================================
   P0-6 底部进度架（2026-08-15 二次重塑）：去「悬浮胶囊」化——
   悬浮小组件浮在正文上=违和；改为停靠式工具架：全宽贴底、
   发丝线分隔、控件居中收束、随 header 滚动自动隐藏。
   ============================================================ */
#readerBottomBar {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    transform: translateY(0);
    z-index: 90;
    display: none;
    align-items: center;
    justify-content: center;
    gap: 18px;
    height: 46px;
    padding: 0 24px;
    border-radius: 0;
    background: color-mix(in srgb, var(--paper-2) 90%, transparent);
    backdrop-filter: blur(16px) saturate(1.1);
    -webkit-backdrop-filter: blur(16px) saturate(1.1);
    border-top: 1px solid var(--line);
    box-shadow: none;
    font-family: var(--ui-sans, var(--sans));
    transition: transform .28s cubic-bezier(.4, 0, .2, 1);
}
#readerBottomBar.is-visible { display: flex; }
body.reader-chrome-hidden #readerBottomBar { transform: translateY(100%); }
#readerBottomBar .bb-btn {
    width: 32px; height: 32px; padding: 0; border: 0; border-radius: 50%;
    background: transparent; color: var(--ink-soft);
    font: 600 16px/1 var(--ui-sans, var(--sans)); cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center;
    transition: background var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
}
#readerBottomBar .bb-btn:hover { background: var(--paper-3); color: var(--ink); }
#readerBottomBar .bb-btn:disabled { opacity: .35; cursor: default; background: none; }
#readerBottomBar .bb-center {
    display: flex; align-items: center; gap: 14px;
    width: min(560px, 56vw); justify-content: center;
}
#readerBottomBar .bb-slider {
    -webkit-appearance: none; appearance: none;
    flex: 1; min-width: 0; height: 3px; border-radius: 999px;
    background: var(--line-strong); outline: none; cursor: pointer;
}
#readerBottomBar .bb-slider::-webkit-slider-thumb {
    -webkit-appearance: none; appearance: none;
    width: 13px; height: 13px; border-radius: 50%;
    background: var(--accent); border: 2px solid var(--paper-2);
    box-shadow: 0 1px 4px color-mix(in srgb, var(--ink) 25%, transparent);
}
#readerBottomBar .bb-slider::-moz-range-thumb {
    width: 13px; height: 13px; border-radius: 50%;
    background: var(--accent); border: 2px solid var(--paper-2);
}
#readerBottomBar .bb-label {
    font-size: 11.5px; font-weight: 600; color: var(--ink-mute);
    font-variant-numeric: tabular-nums; min-width: 72px; text-align: center;
    white-space: nowrap;
}
@media (max-width: 768px) { #readerBottomBar { display: none !important; } }

/* ============================================================
   P0-7 划线高亮 + 选中工具条
   ============================================================ */
mark.hl {
    background: color-mix(in srgb, var(--accent) 20%, transparent);
    color: inherit;
    padding: .02em 0;
    border-radius: 2px;
    cursor: pointer;
}
mark.hl:hover { background: color-mix(in srgb, var(--accent) 30%, transparent); }
#selectionToolbar {
    position: fixed;
    z-index: 95;
    display: none;
    align-items: center;
    gap: 2px;
    height: 36px;
    padding: 0 6px;
    border-radius: 10px;
    background: color-mix(in srgb, var(--ink) 92%, transparent);
    box-shadow: var(--shadow-lg);
    font-family: var(--ui-sans, var(--sans));
}
#selectionToolbar.is-visible { display: flex; }
#selectionToolbar button {
    height: 28px; padding: 0 12px; margin: 0; border: 0; border-radius: 7px;
    background: transparent; color: #F5EFE4;
    font: 600 12.5px/1 var(--ui-sans, var(--sans)); cursor: pointer;
    white-space: nowrap;
}
#selectionToolbar button:hover { background: rgba(255, 255, 255, .14); }

/* ---- 目录搜索框 ---- */
.toc-search-wrap { padding: 10px 12px; border-bottom: 1px solid var(--line); }
.toc-search {
    width: 100%; height: 32px; padding: 0 12px;
    border: 1px solid var(--line); border-radius: var(--radius-sm);
    background: var(--paper); color: var(--ink);
    font: 500 12.5px/1 var(--ui-sans, var(--sans));
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.toc-search::placeholder { color: var(--ink-mute); }
.toc-search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.toc-empty {
    padding: 26px 18px; text-align: center;
    color: var(--ink-mute); font: 500 12.5px/1.6 var(--ui-sans, var(--sans));
}

/* ============================================================
   P0-8 首部再压缩 + 章节头与底部条重塑（2026-08-14 二次反馈）
   ============================================================ */
/* 顶栏去书名块：WeRead 顶栏只有工具，书名在目录侧栏/封面页/标签页标题里 */
.reader-shell .book-row,
.reader-shell .book-sub-row {
    display: none !important;
}
.reader-shell .header { padding-top: 6px !important; padding-bottom: 6px !important; }
.reader-shell .header-toolbar { min-height: 38px; }

/* 章节头：WeRead 式轻量两行——微型章号 + 标题，无下划线无装饰。
   字号随 Aa 阅读字号缩放（此前标题固定 rem，放大后正文反超标题） */
.reader-shell .chapter-header,
.chapter-header {
    margin: 0 0 1.5em !important;
    padding: 0 0 0 !important;
    border-bottom: none !important;
}
.reader-shell .chapter-number-display,
.chapter-number-display {
    font-family: var(--ui-sans, var(--sans)) !important;
    font-style: normal !important;
    font-size: calc(11px * var(--reader-font-scale, 1)) !important;
    font-weight: 600;
    letter-spacing: .14em;
    text-transform: none;
    color: var(--ink-mute) !important;
    margin: 0 0 5px !important;
    display: block !important;
}
.reader-shell .chapter-title-display,
.chapter-title-display {
    font-family: var(--serif) !important;
    font-size: calc(clamp(1.15rem, 1.8vw, 1.35rem) * var(--reader-font-scale, 1)) !important;
    font-weight: 600 !important;
    line-height: 1.35 !important;
    letter-spacing: -.01em !important;
}

/* 底部进度架：P0-6 单一权威定义（上方），本块旧胶囊覆盖已删（2026-08-15） */

/* ============================================================
   P0-9 工具栏按钮统一（三代收敛，2026-08-14）
   旧三代：桌面硬编码 rgba 描边胶囊 / ≤900px 圆形 44px 图标 / ≤768px 38px。
   统一为全站同语言的幽灵按钮：透明底 32px、hover 淡底浮出、token 化
   （midnight 自动正确）；移动端图标化 38px。
   ============================================================ */
.reader-shell .header-btn,
.reader-shell .back-link-inline {
    background: transparent !important;
    border: 1px solid transparent !important;
    color: var(--ink-soft) !important;
    border-radius: var(--radius-sm) !important;
    min-height: 32px !important;
    min-width: 0 !important;
    height: 32px !important;
    width: auto !important;
    padding: 0 10px !important;
    margin: 0 !important;
    font-size: 12.5px !important;
    font-weight: 500 !important;
    box-shadow: none !important;
    gap: 6px !important;
    transform: none !important;
    transition: background var(--transition-fast), color var(--transition-fast) !important;
}
.reader-shell .header-btn:hover,
.reader-shell .back-link-inline:hover {
    background: var(--paper-3) !important;
    border-color: transparent !important;
    color: var(--ink) !important;
    transform: none !important;
    box-shadow: none !important;
}
.reader-shell .header-btn:active { transform: scale(.96) !important; }
.reader-shell .header-btn svg,
.reader-shell .header-btn .icon,
.reader-shell .back-link-inline svg,
.reader-shell .back-link-inline .icon { font-size: 15px; width: 15px; height: 15px; }
.reader-shell .header-btn.fav-btn.is-fav,
.reader-shell .header-btn[aria-pressed="true"] { color: var(--accent) !important; }

@media (max-width: 900px) {
    .reader-shell .header-btn,
    .reader-shell .back-link-inline {
        width: 38px !important;
        height: 38px !important;
        min-width: 38px !important;
        min-height: 38px !important;
        padding: 0 !important;
        border-radius: var(--radius-sm) !important;
        font-size: 0 !important;
        justify-content: center !important;
    }
    .reader-shell .header-btn svg,
    .reader-shell .header-btn .icon { font-size: 17px; width: 17px; height: 17px; }
}


/* ?chapter=N 直达正文：初始隐藏封面页（可被 JS 内联 display 解除——
   旧实现用 !important 内联样式永久压制了「关于本书」回封面） */
.reader-shell.reader-jump-mode #bookCoverPage { display: none; }
.reader-shell.reader-jump-mode #content-area { display: block; }
/* ============================================================
   P1-1 笔记系统（2026-08-15）—— 微信读书式：选中写想法 + 侧栏笔记面板
   ============================================================ */
/* 侧栏 Tab（目录 | 笔记） */
.sidebar-tabs { display: flex; gap: 2px; }
.sidebar-tab {
    appearance: none; border: 0; background: transparent; cursor: pointer;
    font: 600 13px/1 var(--ui-sans, var(--sans));
    color: var(--ink-mute); padding: 8px 12px; border-radius: var(--radius-sm);
    display: inline-flex; align-items: center; gap: 6px;
    box-shadow: inset 0 -2px 0 transparent;
    transition: color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}
.sidebar-tab:hover { color: var(--ink); background: var(--paper-3); }
.sidebar-tab.active { color: var(--accent); box-shadow: inset 0 -2px 0 var(--accent); }
.sidebar-tab .tab-count {
    font-size: 10px; font-weight: 700; min-width: 17px; height: 17px; padding: 0 5px;
    border-radius: 999px; background: var(--paper-3); color: var(--ink-mute);
    display: inline-flex; align-items: center; justify-content: center;
    font-variant-numeric: tabular-nums;
}
.sidebar-tab.active .tab-count { background: var(--accent-soft); color: var(--accent); }
body.notes-tab-active .toc-search-wrap,
body.notes-tab-active .chapter-list { display: none !important; }
body:not(.notes-tab-active) .notes-panel { display: none !important; }

/* 笔记面板 */
.notes-panel { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.notes-list { flex: 1; overflow-y: auto; overscroll-behavior: contain; padding: 8px 0 24px; }
.note-item {
    padding: 12px 18px; border-bottom: 1px solid color-mix(in srgb, var(--line) 55%, transparent);
    cursor: pointer; transition: background var(--transition-fast);
}
.note-item:hover { background: var(--paper-3); }
.note-quote {
    font-family: var(--serif); font-size: .8rem; line-height: 1.55; color: var(--ink-soft);
    border-left: 2px solid var(--accent); padding-left: 10px; margin: 0 0 7px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.note-text { font-family: var(--ui-sans); font-size: .8rem; line-height: 1.6; color: var(--ink); margin: 0; white-space: pre-wrap; }
.note-meta { font-family: var(--ui-sans); font-size: .64rem; color: var(--ink-mute); margin-top: 6px; display: flex; gap: 8px; align-items: center; }
.note-meta .note-del { margin-left: auto; border: 0; background: none; color: var(--ink-mute); font-size: .64rem; cursor: pointer; padding: 2px 6px; border-radius: 4px; }
.note-meta .note-del:hover { color: var(--err); background: var(--err-soft); }
.notes-empty { padding: 40px 22px; text-align: center; color: var(--ink-mute); font: 500 12.5px/1.8 var(--ui-sans); }
.notes-empty b { display: block; font-family: var(--serif); font-size: .95rem; color: var(--ink-soft); margin-bottom: 6px; }

/* 带笔记的划线：accent 实底 + 右上角小标 */
mark.hl.has-note { background: color-mix(in srgb, var(--accent) 26%, transparent); position: relative; }
mark.hl.has-note::after {
    content: "✎"; position: absolute; top: -9px; right: -7px;
    font-size: 9px; color: var(--accent); font-weight: 700;
}

/* 笔记编辑浮卡（选中文字上方弹出） */
#noteEditor {
    position: fixed; z-index: 96; display: none;
    width: 320px; max-width: calc(100vw - 24px);
    padding: 12px 14px; border-radius: 12px;
    background: var(--paper-2); border: 1px solid var(--line);
    box-shadow: var(--shadow-lg);
}
#noteEditor.is-visible { display: block; }
#noteEditor .ne-quote {
    font-family: var(--serif); font-size: .74rem; line-height: 1.5; color: var(--ink-mute);
    border-left: 2px solid var(--accent); padding-left: 8px; margin: 0 0 9px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
#noteEditor textarea {
    width: 100%; height: 68px; resize: vertical; padding: 8px 10px;
    border: 1px solid var(--line-strong); border-radius: 8px;
    background: var(--paper); color: var(--ink);
    font: 400 .8rem/1.55 var(--ui-sans); outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
#noteEditor textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
#noteEditor .ne-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 9px; }
#noteEditor .ne-btn {
    height: 32px; padding: 0 16px; border-radius: 999px; border: 0; cursor: pointer;
    font: 600 12.5px/1 var(--ui-sans);
}
#noteEditor .ne-cancel { background: transparent; color: var(--ink-mute); }
#noteEditor .ne-cancel:hover { color: var(--ink); background: var(--paper-3); }
#noteEditor .ne-save { background: var(--accent); color: var(--paper-2); }
#noteEditor .ne-save:hover { background: var(--accent-ink); }