/* ==========================================================================
   全局样式重置与基础设定
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
    --danger-color: #e74c3c;
    --text-color: #333;
    --text-secondary: #7f8c8d;
    --bg-color: #f5f7fa;
    --sidebar-bg: #fff;
    --border-color: #eee;
    --highlight-color: #ffeb3b;
    --active-highlight: #ff9800;
    --bracket-color: #d32f2f;
    --card-bg: #fff;
    --hover-bg: #f0f4f8;
    --header-bg: #fff;
    --nav-bar-bg: #fff3cd;
}

/* 黑夜模式变量覆盖 */
[data-theme="dark"] {
    --primary-color: #5dade2;
    --primary-dark: #3498db;
    --success-color: #27ae60;
    --text-color: #ecf0f1;
    --text-secondary: #bdc3c7;
    --bg-color: #2c3e50;
    --sidebar-bg: #34495e;
    --border-color: #465c71;
    --highlight-color: #d4ac0d;
    --active-highlight: #e67e22;
    --bracket-color: #e74c3c;
    --card-bg: #34495e;
    --hover-bg: #2c3e50;
    --header-bg: #34495e;
    --nav-bar-bg: #465c71;
}

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
    line-height: 1.6;
    background: var(--bg-color); /* 使用变量 */
    height: 100vh;
    padding: 10px;
    overflow: hidden; 
    color: var(--text-color);
    transition: background 0.3s, color 0.3s;
}

/* ==========================================================================
   主容器布局
   ========================================================================== */
.app-container {
    max-width: 100%;
    margin: 0;
    height: calc(100vh - 20px);
    background: var(--card-bg); /* 使用变量 */
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    display: flex;
    overflow: hidden;
    transition: background 0.3s;
}

/* ==========================================================================
   左侧栏：导航与检索枢纽
   ========================================================================== */
.sidebar {
    width: 320px;
    min-width: 220px;
    max-width: 800px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: relative;
    transition: background 0.3s, border-color 0.3s;
}

/* 拖拽手柄 */
.sidebar-resizer {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    cursor: col-resize;
    z-index: 100;
    background: transparent;
    transition: background 0.2s;
}
.sidebar-resizer:hover, .sidebar-resizer.resizing {
    background: rgba(52, 152, 219, 0.5);
}

/* 顶部：选择文件夹 */
.sidebar-header {
    padding: 10px 12px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

/* 新增：顶部行布局 (标题 + 黑夜按钮) */
.header-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.app-title {
    font-size: 1rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 黑夜模式切换按钮 */
.theme-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: background 0.2s;
}
.theme-btn:hover { background: rgba(255,255,255,0.4); }

.folder-btn {
    width: 100%;
    padding: 6px 10px;
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 4px;
    color: white;
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: background 0.2s;
    margin-top: 5px;
}
.folder-btn:hover { background: rgba(255,255,255,0.3); }

.folder-info {
    font-size: 0.75rem;
    margin-top: 5px;
    opacity: 0.9;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Tab 切换 */
.sidebar-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background: var(--sidebar-bg); /* 适配黑夜 */
}

.tab-btn {
    flex: 1;
    padding: 10px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}
.tab-btn:hover { background: rgba(0,0,0,0.05); color: var(--primary-color); }
[data-theme="dark"] .tab-btn:hover { background: rgba(255,255,255,0.05); }

.tab-btn.active {
    background: var(--card-bg);
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* 内容列表 */
.sidebar-content {
    flex: 1;
    overflow-y: auto;
    position: relative;
    padding-right: 5px;
}

.tab-pane { display: none; height: 100%; }
.tab-pane.active { display: flex; flex-direction: column; }

/* 浏览视图 */
.file-filters {
    padding: 8px 10px;
    display: flex;
    gap: 5px;
    border-bottom: 1px solid var(--border-color);
    background: var(--card-bg);
}

.filter-tag {
    padding: 3px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    cursor: pointer;
    background: rgba(0,0,0,0.05); /* 适配黑夜 */
    color: var(--text-secondary);
    border: none;
}
[data-theme="dark"] .filter-tag { background: rgba(255,255,255,0.1); }

.filter-tag.active { background: var(--primary-color); color: white; }

.file-list { list-style: none; padding: 0; margin: 0; }

.file-item {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
}
.file-item:hover { background: var(--hover-bg); }
.file-item.active { background: rgba(52, 152, 219, 0.15); border-left: 3px solid var(--primary-color); }

.file-icon { font-size: 1rem; flex-shrink: 0; }
.file-icon.txt { color: var(--primary-color); }
.file-icon.docx { color: var(--success-color); }

.file-details { flex: 1; min-width: 0; }
.file-name {
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}

/* 全局搜索视图 */
.global-search-box {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    background: var(--card-bg);
}

.search-input-group { display: flex; gap: 5px; }
.search-input-group input {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    border-radius: 4px;
    font-size: 0.85rem;
}
.search-input-group button {
    padding: 6px 12px;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.search-status-bar {
    padding: 5px 10px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: rgba(0,0,0,0.02);
    border-bottom: 1px solid var(--border-color);
}
[data-theme="dark"] .search-status-bar { background: rgba(255,255,255,0.02); }

.search-results-list { flex: 1; overflow-y: auto; }

/* 搜索结果条目 */
.search-result-item {
    padding: 0; 
    border-bottom: 1px solid var(--border-color);
    cursor: default;
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
}

/* 结果头部 */
.result-header {
    padding: 10px 12px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    transition: background 0.2s;
}
.result-header:hover { background: var(--hover-bg); }

.result-file-info {
    font-weight: bold;
    font-size: 0.85rem;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
}
.result-count {
    font-weight: normal;
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-left: 4px;
}
.result-toggle-icon {
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.2s;
    margin-left: 10px;
}
.result-header.expanded .result-toggle-icon { transform: rotate(180deg); }

/* 子结果容器 */
.sub-results-container {
    display: none;
    background: rgba(0,0,0,0.02); /* 适配黑夜 */
    border-top: 1px solid var(--border-color);
}
[data-theme="dark"] .sub-results-container { background: rgba(0,0,0,0.2); }

.sub-results-container.expanded { display: block; }

/* 子结果条目 */
.sub-result-item {
    padding: 8px 12px 8px 28px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.5;
    transition: background 0.2s;
    position: relative;
}
.sub-result-item:before {
    content: "";
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #ccc;
}
[data-theme="dark"] .sub-result-item:before { background: #666; }

.sub-result-item:hover { background: rgba(52, 152, 219, 0.1); color: var(--text-color); }
.sub-result-item:hover:before { background: var(--primary-color); }

.sub-result-item em {
    font-style: normal;
    background: var(--highlight-color);
    font-weight: bold;
    color: #d35400; /* 高亮文字保持深色以便阅读，或单独设变量 */
    padding: 0 1px;
}
[data-theme="dark"] .sub-result-item em { color: #fff; } /* 黑夜模式下高亮文字变白 */

/* ==========================================================================
   右侧栏：阅读与处理中心
   ========================================================================== */
.main-viewer {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--card-bg);
    border-left: 1px solid var(--border-color);
}

/* 工具栏 */
.viewer-header {
    padding: 10px 20px;
    min-height: 60px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--header-bg);
    flex-wrap: wrap;
    gap: 10px;
}

.doc-info h2 {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.doc-stats { font-size: 0.8rem; color: var(--text-secondary); }

.viewer-actions { display: flex; gap: 10px; align-items: center; }

/* 编码控件 */
.encoding-control {
    display: flex;
    align-items: center;
    background: rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 2px;
}
[data-theme="dark"] .encoding-control { background: rgba(255,255,255,0.05); }

.encoding-label { font-size: 0.8rem; color: var(--text-secondary); padding: 0 5px; }
.encoding-select {
    border: none;
    background: transparent;
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--primary-dark);
    cursor: pointer;
    padding: 3px 5px;
}
.encoding-select:focus { outline: none; }
[data-theme="dark"] .encoding-select option { background: var(--bg-color); color: var(--text-color); }

.save-btn {
    padding: 5px 10px;
    font-size: 0.85rem;
    border: none;
    border-radius: 4px;
    background: var(--success-color);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
}
.save-btn:hover { background: #27ae60; }
.save-btn:disabled { background: #95a5a6; cursor: not-allowed; }

/* 页内搜索 */
.local-search { position: relative; }
.local-search input {
    padding: 5px 25px 5px 10px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    border-radius: 15px;
    width: 180px;
    font-size: 0.85rem;
    transition: width 0.3s;
}
.local-search input:focus { width: 240px; border-color: var(--primary-color); outline: none; }
.local-search i {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
    font-size: 0.8rem;
}

/* 搜索导航条 */
.search-nav-bar {
    background: var(--nav-bar-bg);
    padding: 5px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border-color);
    display: none; 
    color: var(--text-color);
}
.nav-controls button {
    background: rgba(255,255,255,0.6);
    border: 1px solid rgba(0,0,0,0.1);
    padding: 2px 8px;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 5px;
    color: #333;
}
[data-theme="dark"] .nav-controls button { background: rgba(0,0,0,0.3); color: #fff; border-color: rgba(255,255,255,0.1); }
.nav-controls button:hover { background: white; }
[data-theme="dark"] .nav-controls button:hover { background: rgba(255,255,255,0.1); }

/* 内容阅读区 */
.viewer-body {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--bg-color); /* 稍微深一点的背景区分纸张 */
}

.content-scroller {
    height: 100%;
    overflow-y: auto;
    padding: 30px 50px;
    scroll-behavior: smooth;
}

.document-content {
    max-width: 1000px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-color);
    white-space: pre-wrap;
    word-wrap: break-word;
    padding-bottom: 50px;
}

/* DOCX 样式 */
.docx-content h1, .docx-content h2, .docx-content h3 {
    margin-top: 1.5em;
    margin-bottom: 0.8em;
    color: var(--text-color);
}

/* 高亮与标记 */
.highlight {
    background-color: var(--highlight-color);
    color: #333; /* 高亮文字保持深色 */
    padding: 2px 0;
    border-radius: 2px;
}
.highlight.active {
    background-color: var(--active-highlight);
    box-shadow: 0 0 0 2px var(--active-highlight);
    color: #fff;
}
.bracket-content { color: var(--bracket-color); font-weight: bold; }

/* 滚动条标记 */
.scrollbar-markers {
    position: absolute;
    top: 0;
    right: 0;
    width: 12px;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}
.marker {
    position: absolute;
    right: 0;
    width: 8px;
    height: 4px;
    background: rgba(255, 152, 0, 0.6);
    border-radius: 2px;
    pointer-events: auto;
    cursor: pointer;
}
.marker.active { background: #e65100; width: 12px; }

/* 空状态与加载 */
.empty-state {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-align: center;
}
.empty-state i { font-size: 3rem; margin-bottom: 15px; opacity: 0.5; }

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    flex-direction: column;
    color: #333;
}
[data-theme="dark"] .loading-overlay { background: rgba(0,0,0,0.7); color: #fff; }

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0,0,0,0.1);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 10px;
}
[data-theme="dark"] .spinner { border-color: rgba(255,255,255,0.1); border-top-color: var(--primary-color); }

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* 滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: #ccc; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #bbb; }
::-webkit-scrollbar-track { background: transparent; }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: #555; }
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover { background: #666; }

/* ==========================================================================
   目录与章节高亮
   ========================================================================== */
.chapter-title {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--primary-dark);
    margin: 40px 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    line-height: 1.4;
}
/* 目录抽屉 (位于阅读区右侧) */
.catalog-drawer {
    position: absolute;
    top: 0;
    right: 0; /* 改为右侧 */
    bottom: 0;
    width: 260px;
    background: var(--card-bg);
    border-left: 1px solid var(--border-color); /* 改为左边框 */
    box-shadow: -2px 0 10px rgba(0,0,0,0.1); /* 阴影投向左侧 */
    z-index: 500;
    transform: translateX(100%); /* 初始隐藏在右侧外 */
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
}
.catalog-drawer.active {
    transform: translateX(0);
}
.catalog-header {
    padding: 15px;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}
.catalog-close {
    cursor: pointer;
    color: var(--text-secondary);
}
.catalog-close:hover { color: var(--danger-color); }
.catalog-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px 0;
    list-style: none;
}
.catalog-item {
    padding: 5px 10px; /* 缩小内边距 */
    font-size: 0.75rem; /* 缩小字体 (约12px) */
    cursor: pointer;
    border-right: 3px solid transparent; /* 选中条改为右侧 */
    border-left: none;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: all 0.2s;
    line-height: 1.4;
}
.catalog-item:hover {
    background: var(--hover-bg);
    color: var(--primary-color);
}
.catalog-item.active {
    background: rgba(52, 152, 219, 0.1);
    border-right-color: var(--primary-color); /* 选中条在右侧 */
    color: var(--primary-dark);
    font-weight: bold;
}
/* 悬浮目录按钮 (右侧) */
.catalog-toggle-btn {
    position: absolute;
    right: 0;
    top: 100px; /* 距离顶部一定距离 */
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-right: none;
    border-radius: 4px 0 0 4px;
    padding: 10px 8px;
    box-shadow: -2px 0 5px rgba(0,0,0,0.1);
    cursor: pointer;
    z-index: 400;
    writing-mode: vertical-rl; /* 竖排文字 */
    text-orientation: upright;
    font-size: 0.85rem;
    color: var(--primary-color);
    letter-spacing: 2px;
    transition: right 0.3s;
}
.catalog-toggle-btn:hover {
    background: var(--primary-color);
    color: white;
}
/* 响应式调整 */
@media (max-width: 768px) {
    .catalog-drawer { width: 80%; }
}