/**
 * 电子书阅读器主题样式
 * 支持多种阅读主题和字体设置
 */

/* ========== 基础变量 ========== */
:root {
    /* 默认主题 - 白昼 */
    --bg-color: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --accent-color: #14b8a6;
    --highlight-bg: #fef3c7;
    --highlight-text: #92400e;
    --popup-bg: #ffffff;
    --popup-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* 字体设置 */
    --font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size: 18px;
    --line-height: 1.8;
    --letter-spacing: 0px;
    --paragraph-spacing: 1.5em;
    --page-margin: 1rem;
}

/* ========== 主题定义 ========== */

/* 羊皮纸主题 */
[data-theme="sepia"] {
    --bg-color: #f4ecd8;
    --text-color: #5b4636;
    --text-secondary: #8b7355;
    --border-color: #d4c5a9;
    --accent-color: #a0522d;
    --highlight-bg: #e6d5b8;
    --highlight-text: #5b4636;
    --popup-bg: #f4ecd8;
}

/* 夜间主题 */
[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --text-color: #e4e4e7;
    --text-secondary: #a1a1aa;
    --border-color: #3f3f46;
    --accent-color: #60a5fa;
    --highlight-bg: #3d3d5c;
    --highlight-text: #fbbf24;
    --popup-bg: #252542;
    --popup-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

/* 护眼主题 */
[data-theme="eye-care"] {
    --bg-color: #c7edcc;
    --text-color: #2d5a27;
    --text-secondary: #5a8a52;
    --border-color: #a3d9a5;
    --accent-color: #2d5a27;
    --highlight-bg: #e8f5e9;
    --highlight-text: #1b5e20;
    --popup-bg: #d4edda;
}

/* ========== 阅读器容器 ========== */
.reader-container {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: var(--font-size);
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ========== 阅读内容样式 ========== */
.reader-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 3rem;
    transition: padding 0.3s ease;
    line-height: var(--line-height);
    letter-spacing: var(--letter-spacing);
    -webkit-touch-callout: none;
    -webkit-user-select: text;
    user-select: text;
    touch-action: pan-y;
}

/* 段落 */
.reader-content p {
    margin-bottom: var(--paragraph-spacing);
    text-indent: 2em;
    text-align: justify;
    word-break: break-word;
    line-height: var(--line-height);
    letter-spacing: var(--letter-spacing);
}

/* 标题 */
.reader-content h1,
.reader-content h2,
.reader-content h3,
.reader-content h4,
.reader-content h5,
.reader-content h6 {
    text-indent: 0;
    margin: 2em 0 1em;
    font-weight: 600;
    line-height: 1.4;
    letter-spacing: var(--letter-spacing);
}

.reader-content h1 { font-size: 1.8em; }
.reader-content h2 { font-size: 1.5em; }
.reader-content h3 { font-size: 1.3em; }
.reader-content h4 { font-size: 1.1em; }

/* 引用 */
.reader-content blockquote {
    margin: 1.5em 2em;
    padding-left: 1em;
    border-left: 3px solid var(--accent-color);
    color: var(--text-secondary);
    font-style: italic;
}

/* 列表 */
.reader-content ul,
.reader-content ol {
    margin: 1em 0;
    padding-left: 2em;
}

.reader-content li {
    margin: 0.5em 0;
}

/* 代码 */
.reader-content code {
    background-color: var(--border-color);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
}

.reader-content pre {
    background-color: var(--border-color);
    padding: 1em;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1.5em 0;
}

.reader-content pre code {
    background: none;
    padding: 0;
}

/* 图片 */
.reader-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.5em auto;
}

/* 分隔线 */
.reader-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2em 0;
}

/* 链接 */
.reader-content a {
    color: var(--accent-color);
    text-decoration: underline;
}

/* ========== 实体高亮（人名等）========== */
.entity-highlight {
    background-color: var(--highlight-bg);
    color: var(--highlight-text);
    padding: 0.05em 0.15em;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.entity-highlight:hover {
    background-color: var(--accent-color);
    color: white;
}

/* ========== 实体弹出卡片 ========== */
.entity-popup {
    position: absolute;
    background-color: var(--popup-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    max-width: 300px;
    box-shadow: var(--popup-shadow);
    z-index: 1000;
    animation: popupFadeIn 0.2s ease;
}

@keyframes popupFadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.entity-popup::before {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 6px 6px 0;
    border-style: solid;
    border-color: var(--popup-bg) transparent transparent;
}

.entity-popup .entity-name {
    font-weight: 600;
    font-size: 1.1em;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.entity-popup .entity-alias {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.entity-popup .entity-description {
    font-size: 0.9em;
    line-height: 1.5;
    color: var(--text-color);
}

.entity-popup .entity-count {
    font-size: 0.8em;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
}

.entity-popup .close-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    border-radius: 50%;
    transition: all 0.2s;
}

.entity-popup .close-btn:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}

/* ========== 阅读工具栏 ========== */
.reader-toolbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 100;
    transition: background-color 0.3s ease;
}

.toolbar-left,
.toolbar-center,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toolbar-center {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.progress-text-mini {
    font-size: 11px;
    color: var(--text-color);
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    background: linear-gradient(135deg, var(--border-color) 0%, rgba(59, 130, 246, 0.15) 100%);
    border-radius: 12px;
    min-width: 52px;
    text-align: center;
    letter-spacing: 0.02em;
    border: 1px solid rgba(59, 130, 246, 0.2);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.page-info-mini {
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.2rem 0.5rem;
    background-color: var(--border-color);
    border-radius: 10px;
    min-width: 56px;
    text-align: center;
    margin-right: 0.5rem;
}

.toolbar-btn {
    padding: 0.5rem;
    border-radius: 6px;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toolbar-btn:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}

.toolbar-btn.active {
    color: var(--accent-color);
    background-color: rgba(20, 184, 166, 0.1);
}

/* ========== EPUB 返回按钮（迷你 U-turn）========== */
.back-btn-mini {
    position: relative;
    overflow: hidden;
    padding: 0.35rem;
    color: var(--accent-color);
    background-color: rgba(20, 184, 166, 0.08);
    border-radius: 6px;
}

.back-btn-mini:hover {
    background-color: rgba(20, 184, 166, 0.18);
}

.back-btn-progress-bar {
    position: absolute;
    bottom: 2px;
    left: 4px;
    right: 4px;
    height: 2px;
    border-radius: 1px;
    overflow: hidden;
    background: transparent;
    pointer-events: none;
}

.back-btn-progress-fill {
    height: 100%;
    background: var(--accent-color);
    width: 100%;
    transform: scaleX(1);
    transform-origin: left;
    opacity: 0.7;
}

/* 当返回按钮显示时，进度条开始5秒倒计时 */
#epub-back-btn:not(.hidden) .back-btn-progress-fill {
    animation: backBtnProgress 30s linear forwards;
}

@keyframes backBtnProgress {
    from { transform: scaleX(1); }
    to { transform: scaleX(0); }
}

/* ========== 设置面板（精致弹窗风格） ========== */
.settings-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.92);
    background-color: var(--popup-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 0;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15), 0 8px 24px rgba(0,0,0,0.1);
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    width: 320px;
    max-width: calc(100vw - 2rem);
    max-height: calc(100vh - 80px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.settings-panel.show {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

/* 设置面板头部 */
.settings-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px 6px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.settings-panel-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 6px;
}

.settings-panel-close {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
}

.settings-panel-close:hover {
    background: var(--border-color);
    color: var(--text-color);
}

/* 设置面板内容区 */
.settings-panel-body {
    overflow-y: auto;
    overflow-x: hidden;
    padding: 6px 12px 10px;
    -webkit-overflow-scrolling: touch;
    flex: 1;
}

/* 设置分组 */
.settings-group {
    margin-bottom: 8px;
}

.settings-group:last-child {
    margin-bottom: 0;
}

.settings-group-title {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.settings-group-title svg {
    width: 12px;
    height: 12px;
}

/* 字体大小滑块 */
.font-size-control {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
}

.font-size-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
}

.font-size-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.font-size-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.font-size-value {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-color);
    min-width: 32px;
    text-align: center;
}

/* 字体选择 */
.font-family-select {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
    outline: none;
}

.font-family-select:focus {
    border-color: var(--accent-color);
}

/* 主题选择 */
.theme-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

.theme-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 6px 4px;
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    background: transparent;
}

.theme-option:hover {
    background: var(--border-color);
}

.theme-option.active {
    border-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.08);
}

.theme-preview {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: 1px solid rgba(0,0,0,0.1);
}

.theme-preview.light { background: #ffffff; }
.theme-preview.sepia { background: #f4ecd8; }
.theme-preview.dark { background: #1a1a2e; }
.theme-preview.eye-care { background: #c7edcc; }

.theme-label {
    font-size: 10px;
    color: var(--text-secondary);
}

/* 行高选择 */
.line-height-options {
    display: flex;
    gap: 4px;
}

.line-height-option {
    flex: 1;
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

.line-height-option:hover {
    border-color: var(--accent-color);
}

.line-height-option.active {
    border-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.08);
    color: var(--accent-color);
}

/* 字间距选择 */
.letter-spacing-options {
    display: flex;
    gap: 4px;
}

.letter-spacing-option {
    flex: 1;
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

.letter-spacing-option:hover {
    border-color: var(--accent-color);
}

.letter-spacing-option.active {
    border-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.08);
    color: var(--accent-color);
}

/* 页边距选择 */
.margin-options {
    display: flex;
    gap: 4px;
}

.margin-option {
    flex: 1;
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

.margin-option:hover {
    border-color: var(--accent-color);
}

.margin-option.active {
    border-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.08);
    color: var(--accent-color);
}

/* 自定义字体上传 */
.font-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.15s;
}

.font-upload-area:hover {
    border-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.04);
}

.font-upload-area input {
    display: none;
}

.font-upload-text {
    font-size: 12px;
    color: var(--text-secondary);
}

.font-upload-hint {
    font-size: 10px;
    color: var(--text-secondary);
    opacity: 0.7;
    margin-top: 2px;
}

/* 自定义字体列表 */
.custom-font-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 6px;
}

.custom-font-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5px 8px;
    background: var(--border-color);
    border-radius: 6px;
    font-size: 12px;
}

.custom-font-item button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 11px;
    padding: 2px 4px;
}

.custom-font-item button:hover {
    color: #ef4444;
}

/* ========== 目录面板 ========== */
.toc-panel {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 320px;
    max-width: 80vw;
    background-color: var(--popup-bg);
    border-right: 1px solid var(--border-color);
    z-index: 150;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.toc-panel.show {
    transform: translateX(0);
}

.toc-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.toc-panel-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

.toc-panel-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.toc-panel-close:hover {
    background: var(--border-color);
    color: var(--text-color);
}

.toc-list {
    overflow-y: auto;
    flex: 1;
    padding: 0.5rem 0;
}

.toc-item {
    padding: 0.6rem 1rem;
    cursor: pointer;
    transition: all 0.15s;
    border-left: 3px solid transparent;
    color: var(--text-color);
    font-size: 0.9rem;
}

.toc-item:hover {
    background: var(--border-color);
}

.toc-item.active {
    border-left-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.08);
    color: var(--accent-color);
    font-weight: 500;
}

.toc-item.level-1 { padding-left: 1rem; }
.toc-item.level-2 { padding-left: 1.8rem; font-size: 0.85rem; }
.toc-item.level-3 { padding-left: 2.6rem; font-size: 0.8rem; }

/* ========== 遮罩层 ========== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 120;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.overlay.show {
    opacity: 1;
    pointer-events: auto;
}

/* ========== 头部栏 ========== */
.reader-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    transition: transform 0.3s ease, background-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
}

.reader-header.hidden {
    transform: translateY(-100%);
}

.reader-header.visible {
    transform: translateY(0);
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-btn {
    padding: 0.5rem;
    border-radius: 6px;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-btn:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}

.book-info {
    flex: 1;
    text-align: center;
    overflow: hidden;
}

.book-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.book-author {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ========== 选择文本菜单 ========== */
.selection-menu {
    position: absolute;
    background: var(--popup-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--popup-shadow);
    z-index: 1000;
    display: flex;
    gap: 0.25rem;
    padding: 0.25rem;
    animation: popupFadeIn 0.15s ease;
}

.selection-menu button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    padding: 0.4rem 0.6rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.15s;
    font-size: 0.7rem;
}

.selection-menu button:hover {
    background: var(--border-color);
    color: var(--text-color);
}

.selection-menu button svg {
    width: 16px;
    height: 16px;
}

/* ========== 标注列表 ========== */
.annotation-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 360px;
    max-width: 90vw;
    background-color: var(--popup-bg);
    border-left: 1px solid var(--border-color);
    z-index: 150;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.annotation-panel.show {
    transform: translateX(0);
}

.annotation-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.annotation-panel-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.annotation-count {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--border-color);
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
}

.annotation-panel-actions {
    display: flex;
    gap: 0.25rem;
}

.panel-action-btn {
    padding: 0.4rem;
    border-radius: 6px;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.panel-action-btn:hover {
    background: var(--border-color);
    color: var(--text-color);
}

.annotation-list {
    overflow-y: auto;
    flex: 1;
    padding: 0.75rem;
}

.annotation-item {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.15s;
    background: var(--bg-color);
}

.annotation-item:hover {
    border-color: var(--accent-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.annotation-text {
    font-size: 0.85rem;
    color: var(--text-color);
    margin-bottom: 0.35rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.annotation-note {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 0.25rem;
    padding-top: 0.25rem;
    border-top: 1px solid var(--border-color);
}

.annotation-meta {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.35rem;
    display: flex;
    justify-content: space-between;
}

.annotation-actions {
    display: flex;
    gap: 0.25rem;
    margin-top: 0.5rem;
}

.annotation-actions button {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.annotation-actions button:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* ========== 人物标注面板 ========== */
.entity-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 380px;
    max-width: 90vw;
    background-color: var(--popup-bg);
    border-left: 1px solid var(--border-color);
    z-index: 150;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.entity-panel.show {
    transform: translateX(0);
}

.entity-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.entity-panel-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.entity-count {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--border-color);
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
}

.entity-panel-actions {
    display: flex;
    gap: 0.25rem;
}

.entity-panel-add {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.entity-input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.entity-input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.15s;
}

.entity-input:focus {
    border-color: var(--accent-color);
}

.entity-input-full {
    width: 100%;
    margin-bottom: 0.5rem;
    box-sizing: border-box;
}

.entity-select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
}

.entity-select:focus {
    border-color: var(--accent-color);
}

.entity-style-select,
.entity-color-select {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.entity-style-select label,
.entity-color-select label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.style-options,
.color-options {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.style-option {
    padding: 0.25rem 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
    transition: all 0.15s;
}

.style-option:hover {
    border-color: var(--accent-color);
}

.style-option.active {
    border-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.08);
}

.style-preview {
    font-size: 0.8rem;
    padding: 0.1rem 0.3rem;
    border-radius: 2px;
}

.color-option {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.15s;
    padding: 0;
}

.color-option:hover {
    transform: scale(1.1);
}

.color-option.active {
    border-color: var(--text-color);
    box-shadow: 0 0 0 2px var(--bg-color), 0 0 0 4px var(--accent-color);
}

.color-custom-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.color-custom-wrapper input[type="color"] {
    width: 24px;
    height: 24px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    background: none;
}

.color-custom-label {
    font-size: 0.6rem;
    color: var(--text-secondary);
}

.entity-add-btn {
    width: 100%;
    padding: 0.6rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
}

.entity-add-btn:hover {
    opacity: 0.9;
}

.entity-rule-list {
    overflow-y: auto;
    flex: 1;
    padding: 0.75rem;
}

.entity-rule-item {
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.15s;
    background: var(--bg-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.entity-rule-item:hover {
    border-color: var(--accent-color);
}

.entity-rule-item.selected {
    border-color: var(--accent-color);
    background: rgba(20, 184, 166, 0.08);
}

.entity-rule-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--accent-color);
}

.entity-rule-info {
    flex: 1;
    min-width: 0;
}

.entity-rule-name {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.entity-rule-meta {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.15rem;
}

.entity-rule-actions {
    display: flex;
    gap: 0.15rem;
    opacity: 0;
    transition: opacity 0.15s;
}

.entity-rule-item:hover .entity-rule-actions {
    opacity: 1;
}

.entity-rule-actions button {
    padding: 0.2rem;
    border: 1px solid transparent;
    border-radius: 4px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.7rem;
    transition: all 0.15s;
}

.entity-rule-actions button:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.entity-rule-actions button.edit-style.active {
    border-color: var(--accent-color);
    background-color: rgba(20, 184, 166, 0.1);
    color: var(--accent-color);
}

.entity-rule-actions button.delete-rule:hover {
    border-color: #ef4444;
    color: #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
}

/* 正则规则标签 */
.rule-type-badge {
    font-size: 0.65rem;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    background-color: var(--border-color);
    color: var(--text-secondary);
    margin-left: 0.35rem;
    vertical-align: middle;
}

/* ========== 搜索面板 ========== */
.search-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 380px;
    max-width: 90vw;
    background-color: var(--popup-bg);
    border-left: 1px solid var(--border-color);
    z-index: 150;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.search-panel.show {
    transform: translateX(0);
}

.search-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.search-panel-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-results {
    overflow-y: auto;
    flex: 1;
    padding: 0.75rem;
}

.search-result-item {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.15s;
    background: var(--bg-color);
}

.search-result-item:hover {
    border-color: var(--accent-color);
}

.search-result-text {
    font-size: 0.85rem;
    color: var(--text-color);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-result-text mark {
    background: rgba(251, 191, 36, 0.5);
    color: inherit;
    padding: 0 2px;
    border-radius: 2px;
}

.search-result-meta {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.35rem;
}

.search-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

/* ========== 进度跳转弹窗 ========== */
.progress-jump-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.progress-jump-overlay:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.progress-jump-dialog {
    background: var(--popup-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    width: 280px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.progress-jump-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
}

.progress-jump-dialog input[type="range"] {
    width: 100%;
    margin-bottom: 1rem;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
}

.progress-jump-dialog input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.progress-jump-buttons {
    display: flex;
    gap: 0.5rem;
}

.progress-jump-btn {
    flex: 1;
    padding: 0.6rem;
    border-radius: 6px;
    border: none;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
}

.progress-jump-btn-cancel {
    background: var(--border-color);
    color: var(--text-secondary);
}

.progress-jump-btn-confirm {
    background: var(--accent-color);
    color: white;
}

.progress-jump-btn:hover {
    opacity: 0.9;
}

/* ========== 加载动画 ========== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========== 翻页方向指示器 ========== */
.page-turn-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 200;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.page-turn-indicator.show {
    opacity: 1;
}

.indicator-arrow {
    width: 48px;
    height: 48px;
    color: var(--accent-color);
    opacity: 0.6;
}

/* ========== 笔记对话框 ========== */
.note-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background: var(--popup-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    width: 400px;
    max-width: 90vw;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    z-index: 300;
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s ease;
}

.note-dialog.show {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.note-dialog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.note-dialog-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

.note-dialog-source {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    padding: 0.4rem 0.6rem;
    background: var(--border-color);
    border-radius: 6px;
    line-height: 1.4;
}

.note-dialog textarea {
    width: 100%;
    min-height: 100px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 0.9rem;
    resize: vertical;
    outline: none;
    box-sizing: border-box;
}

.note-dialog textarea:focus {
    border-color: var(--accent-color);
}

.note-dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.note-dialog-btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: none;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
}

.note-dialog-btn-cancel {
    background: var(--border-color);
    color: var(--text-secondary);
}

.note-dialog-btn-confirm {
    background: var(--accent-color);
    color: white;
}

/* ========== 实体信息对话框 ========== */
.entity-info-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background: var(--popup-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    width: 360px;
    max-width: 90vw;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    z-index: 300;
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s ease;
}

.entity-info-dialog.show {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.entity-info-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.entity-info-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
}

.entity-info-content {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-color);
}

/* ========== 确认删除对话框 ========== */
.confirm-delete-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background: var(--popup-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    width: 300px;
    max-width: 90vw;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    z-index: 300;
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s ease;
    text-align: center;
}

.confirm-delete-dialog.show {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.confirm-delete-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.confirm-delete-message {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.confirm-delete-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

/* ========== 批量操作栏 ========== */
.entity-batch-bar {
    padding: 0.75rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

/* ========== 正则预设按钮 ========== */
.regex-presets {
    margin-bottom: 0.5rem;
}

.regex-presets label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.25rem;
}

.preset-buttons {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.15s;
}

.preset-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    :root {
        --font-size: 16px;
        --line-height: 1.7;
    }

    .reader-content {
        padding: 1rem var(--page-margin);
    }

    .reader-content p {
        text-indent: 1.5em;
    }

    .reader-content h1 { font-size: 1.5em; }
    .reader-content h2 { font-size: 1.3em; }
    .reader-content h3 { font-size: 1.15em; }

    .reader-toolbar {
        padding: 0.5rem 0.75rem;
        gap: 0.5rem;
    }

    .toolbar-btn {
        padding: 0.6rem;
        min-width: 40px;
        min-height: 40px;
    }

    .toolbar-btn svg {
        width: 22px;
        height: 22px;
    }

    .toc-panel,
    .annotation-panel,
    .entity-panel,
    .search-panel {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        max-width: 100%;
        border-radius: 0;
        z-index: 250;
    }

    .settings-panel {
        position: fixed;
        top: auto;
        left: 0;
        right: 0;
        bottom: 0;
        transform: translateY(100%) scale(1);
        width: 100%;
        max-width: 100%;
        border-radius: 16px 16px 0 0;
        max-height: 85vh;
    }

    .settings-panel.show {
        transform: translateY(0) scale(1);
    }

    .note-dialog,
    .entity-info-dialog,
    .confirm-delete-dialog {
        width: calc(100vw - 2rem);
    }

    .progress-jump-dialog {
        width: calc(100vw - 2rem);
    }
}

@media (max-width: 400px) {
    :root {
        --font-size: 15px;
    }

    .reader-toolbar {
        padding: 0.4rem 0.5rem;
    }

    .page-info-mini,
    .progress-text-mini {
        font-size: 10px;
        padding: 0.15rem 0.4rem;
    }
}

/* ========== 滚动条样式 ========== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ========== 实体面板 Tab ========== */
.entity-panel-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-color);
}

.entity-tab {
    flex: 1;
    padding: 0.6rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.15s;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

.entity-tab:hover {
    color: var(--text-color);
    background: var(--border-color);
}

.entity-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    font-weight: 500;
}

/* ========== 实体面板状态 ========== */
.entity-panel-status {
    padding: 0.5rem 0.75rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
    flex-shrink: 0;
}

/* ========== 默认样式设置 ========== */
.entity-panel-default-style {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.entity-panel-default-style label {
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ========== 隐藏类 ========== */
.hidden {
    display: none !important;
}