:root {
    --bg-color: #1e1e1e;
    --sidebar-bg: #252526;
    --editor-bg: #1e1e1e;
    --border-color: #333333;
    --text-color: #cccccc;
    --text-secondary-color: #888888;
    --accent-color: #007acc;
    --accent-hover-color: #009dff;
    --active-bg: #37373d;
    --button-bg: #3a3d41;
    --button-hover-bg: #4a4d51;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
    /* 新增：预览面板相关颜色 */
    --preview-bg: #2a2a2e;
    --preview-toc-bg: #252526;
    --code-bg: #2d2d2d;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

.app-container {
    display: flex;
    height: 100vh;
    position: relative;
}

.sidebar {
    background-color: var(--sidebar-bg);
    height: 100%;
    display: flex;
    flex-direction: column;
}

#file-explorer {
    width: 280px;
    border-right: 1px solid var(--border-color);
}

#inspector-panel {
    width: 280px;
    border-left: 1px solid var(--border-color);
}

.sidebar-header {
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.sidebar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-actions button {
    background-color: var(--button-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 3px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background-color 0.2s;
}

.sidebar-actions button:hover {
    background-color: var(--button-hover-bg);
}

.sidebar-header h2 {
    font-size: 16px;
}

#new-template-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    font-size: 20px;
    line-height: 22px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#new-template-btn:hover {
    background: var(--accent-hover-color);
}

#file-tree-container, .inspector-section {
    overflow-y: auto;
    padding: 10px 0;
    flex-grow: 1;
}

#file-tree, #outline-list, #placeholder-list {
    list-style: none;
}

#file-tree li {
    padding: 5px 15px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    user-select: none;
}

#file-tree li.template {
    font-weight: bold;
}

#file-tree li.workfile {
    padding-left: 30px;
    color: var(--text-secondary-color);
}

#file-tree li:hover {
    background-color: var(--active-bg);
}

#file-tree li.active {
    background-color: var(--accent-color);
    color: white;
}

#main-editor {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative; /* 新增：为预览面板的绝对定位提供容器 */
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--text-secondary-color);
    text-align: center;
}

#editor-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative; /* 新增：为预览面板的绝对定位提供容器 */
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

#file-title {
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.editor-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

#version-selector, #save-btn, #copy-btn, #undo-btn, #redo-btn, #preview-btn, #copy-html-btn  { /* 新增 #preview-btn */
    background-color: var(--button-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s, opacity 0.2s;
}

#version-selector:hover, #copy-btn:hover, #undo-btn:not(:disabled):hover, #redo-btn:not(:disabled):hover, #preview-btn:hover, #copy-html-btn:hover  { /* 新增 #preview-btn:hover */
    background-color: var(--button-hover-bg);
}

#preview-btn.active { /* 新增：预览按钮激活状态 */
    background-color: var(--accent-color);
    color: white;
}

#save-btn {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

#save-btn:hover {
    background-color: var(--accent-hover-color);
}

#save-btn.dirty {
    animation: pulse 1.5s infinite;
}

#copy-btn.copied, #copy-html-btn.copied {
    background-color: #28a745;
    border-color: #28a745;
    color: white;
}

#undo-btn:disabled, #redo-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 122, 204, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(0, 122, 204, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 122, 204, 0); }
}

#editor-textarea {
    flex-grow: 1;
    background-color: var(--editor-bg);
    color: var(--text-color);
    border: none;
    padding: 15px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    outline: none;
}

#inspector-content h3 {
    font-size: 14px;
    padding: 0 15px 5px;
    color: var(--text-secondary-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 5px;
}

#outline-list li, #placeholder-list li {
    padding: 5px 15px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 13px;
}

#outline-list li:hover, #placeholder-list li:hover {
    background-color: var(--active-bg);
}

.hidden {
    display: none !important;
}

/* Context Menu */
.context-menu {
    position: absolute;
    background-color: #2d2d2d;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    padding: 5px 0;
    z-index: 1000;
}

.context-menu ul {
    list-style: none;
}

.context-menu li {
    padding: 8px 15px;
    cursor: pointer;
    font-size: 14px;
}

.context-menu li:hover {
    background-color: var(--accent-color);
    color: white;
}

#preview-panel {
    position: absolute;
    top: 0;
    right: 0;
    width: 55%; /* 调整宽度以适应视口百分比 */
    height: 100%;
    background-color: var(--preview-bg);
    z-index: 99; /* 提高层级，确保在最上层 */
    display: flex;
    border-left: 1px solid var(--border-color);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out, visibility 0.3s; /* 添加 visibility 过渡 */
    box-shadow: -5px 0 15px rgba(0,0,0,0.3);
    visibility: hidden; /* 默认隐藏，防止交互穿透 */
    pointer-events: none; /* 隐藏时不允许点击 */
}

#preview-panel.visible {
    transform: translateX(0);
    visibility: visible; /* 可见 */
    pointer-events: auto; /* 可见时允许点击 */
}

#preview-toc-container {
    width: 200px;
    flex-shrink: 0;
    background-color: var(--preview-toc-bg);
    padding: 10px;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

#preview-toc-container h4 {
    font-size: 14px;
    color: var(--text-secondary-color);
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

#preview-toc-list {
    list-style: none;
}

#preview-toc-list a {
    display: block;
    padding: 4px 0;
    font-size: 13px;
    color: var(--text-color);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.2s;
}

#preview-toc-list a:hover {
    color: var(--accent-hover-color);
}

#preview-toc-list a.toc-active {
    color: var(--accent-color);
    font-weight: bold;
}

#preview-content {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
}

/* --- 新增：Markdown 基础样式 --- */
.markdown-body {
    line-height: 1.6;
    font-size: 15px;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}
.markdown-body h1 { font-size: 2em; }
.markdown-body h2 { font-size: 1.5em; }
.markdown-body h3 { font-size: 1.25em; }
.markdown-body p { margin-bottom: 16px; }
.markdown-body a { color: var(--accent-hover-color); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body code {
    padding: 0.2em 0.4em;
    margin: 0;
    font-size: 85%;
    background-color: var(--code-bg);
    border-radius: 3px;
    font-family: var(--font-mono);
}
.markdown-body pre {
    background-color: var(--code-bg);
    padding: 16px;
    overflow: auto;
    border-radius: 3px;
    margin-bottom: 16px;
}
.markdown-body pre code {
    padding: 0;
    margin: 0;
    font-size: 100%;
    background-color: transparent;
}
.markdown-body blockquote {
    margin: 0 0 16px;
    padding: 0 1em;
    color: var(--text-secondary-color);
    border-left: 0.25em solid var(--border-color);
}
.markdown-body ul, .markdown-body ol {
    padding-left: 2em;
    margin-bottom: 16px;
}
.markdown-body li {
    margin-bottom: 0.25em;
}