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

:root {
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f5;
    --color-text: #333333;
    --color-text-secondary: #666666;
    --color-border: #e0e0e0;
    --color-primary: #0066cc;
    --color-primary-hover: #0052a3;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-warning: #ffc107;
    --color-toolbar: #ffffff;
    --color-toolbar-text: #333333;
    --color-toolbar-border: #e0e0e0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
}

html.dark-mode {
    --color-bg: #1e1e1e;
    --color-bg-secondary: #2d2d2d;
    --color-text: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-border: #404040;
    --color-primary: #4da6ff;
    --color-primary-hover: #66b3ff;
    --color-toolbar: #2d2d2d;
    --color-toolbar-text: #e0e0e0;
    --color-toolbar-border: #404040;
}

html {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 工具栏 */
.toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background-color: var(--color-toolbar);
    border-bottom: 1px solid var(--color-toolbar-border);
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
    z-index: 100;
}

.toolbar-group {
    display: flex;
    gap: 4px;
    align-items: center;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background-color: var(--color-toolbar-border);
    margin: 0 4px;
}

.toolbar-spacer {
    flex: 1;
}

.toolbar-btn {
    padding: 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background-color: transparent;
    color: var(--color-toolbar-text);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
}

.toolbar-btn:hover {
    background-color: var(--color-bg-secondary);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.toolbar-btn:active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.mode-select {
    padding: 6px 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background-color: transparent;
    color: var(--color-toolbar-text);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    height: 32px;
}

.mode-select:hover {
    border-color: var(--color-primary);
}

/* 容器布局 */
.container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.editor-container {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.editor-container #editor {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    font-family: 'Fira Code', 'Monaco', 'Menlo', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    background-color: var(--color-bg);
    color: var(--color-text);
}

/* CodeMirror */
.CodeMirror {
    background-color: var(--color-bg) !important;
    color: var(--color-text) !important;
    height: 100% !important;
    font-family: 'Fira Code', 'Monaco', 'Menlo', monospace !important;
    font-size: 14px !important;
}

.CodeMirror-scroll {
    overflow: hidden !important;
}

.CodeMirror-scrollbar {
    width: 8px;
}

.CodeMirror-scrollbar-filler,
.CodeMirror-gutter-filler {
    background-color: var(--color-bg) !important;
}

.CodeMirror-linenumber {
    color: var(--color-text-secondary) !important;
    background-color: var(--color-bg-secondary) !important;
}

.CodeMirror-gutters {
    background-color: var(--color-bg-secondary) !important;
    border-right: 1px solid var(--color-border) !important;
}

/* 分割条 */
.splitter {
    width: 4px;
    background-color: var(--color-border);
    cursor: col-resize;
    user-select: none;
    transition: background-color 0.2s ease;
    z-index: 50;
}

.splitter:hover,
.splitter.active {
    background-color: var(--color-primary);
}

/* 预览区 */
.preview-container {
    flex: 1;
    overflow: auto;
    background-color: var(--color-bg);
    border-left: 1px solid var(--color-border);
    transition: all 0.2s ease;
}

.preview-container.drag-over {
    background-color: var(--color-bg-secondary);
    border-left: 3px solid var(--color-primary);
    box-shadow: inset 0 0 10px rgba(0, 102, 204, 0.1);
}

.preview {
    padding: 20px;
    word-wrap: break-word;
    word-break: break-word;
}

/* Markdown 预览样式 */
.preview h1,
.preview h2,
.preview h3,
.preview h4,
.preview h5,
.preview h6 {
    margin: 24px 0 16px;
    font-weight: 600;
    line-height: 1.25;
}

.preview h1 {
    font-size: 2em;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 10px;
}

.preview h2 {
    font-size: 1.5em;
}

.preview h3 {
    font-size: 1.25em;
}

.preview h4 {
    font-size: 1em;
}

.preview h5 {
    font-size: 0.875em;
}

.preview h6 {
    font-size: 0.85em;
    color: var(--color-text-secondary);
}

.preview p {
    margin: 0 0 16px;
}

.preview ul,
.preview ol {
    margin: 0 0 16px;
    padding-left: 2em;
}

.preview li {
    margin: 8px 0;
}

.preview ul li {
    list-style-type: disc;
}

.preview ol li {
    list-style-type: decimal;
}

.preview blockquote {
    margin: 16px 0;
    padding: 12px 16px;
    border-left: 4px solid var(--color-primary);
    background-color: var(--color-bg-secondary);
    color: var(--color-text-secondary);
}

.preview code {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    padding: 2px 6px;
    font-family: 'Fira Code', 'Monaco', 'Menlo', monospace;
    font-size: 0.9em;
    color: var(--color-primary);
}

.preview pre {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 12px 16px;
    overflow-x: auto;
    margin: 16px 0;
    line-height: 1.4;
}

.preview pre code {
    background-color: transparent;
    border: none;
    padding: 0;
    color: var(--color-text);
    font-size: 0.9em;
}

.preview table {
    border-collapse: collapse;
    width: 100%;
    margin: 16px 0;
}

.preview table th,
.preview table td {
    border: 1px solid var(--color-border);
    padding: 8px 12px;
    text-align: left;
}

.preview table th {
    background-color: var(--color-bg-secondary);
    font-weight: 600;
}

.preview table tr:nth-child(even) {
    background-color: var(--color-bg-secondary);
}

.preview a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.preview a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

.preview img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 16px 0;
}

.preview hr {
    border: none;
    border-top: 2px solid var(--color-border);
    margin: 24px 0;
}

/* GFM 扩展 */
.preview .task-list-item {
    list-style-type: none;
    margin-left: -2em;
}

.preview .task-list-item input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
}

.preview del {
    text-decoration: line-through;
    color: var(--color-text-secondary);
}

/* Mermaid */
.mermaid {
    display: flex;
    justify-content: center;
    margin: 16px 0;
}

/* KaTeX 数学公式 */
.katex-display {
    margin: 16px 0;
}

/* 状态栏 */
.statusbar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 12px;
    background-color: var(--color-toolbar);
    border-top: 1px solid var(--color-toolbar-border);
    font-size: 12px;
    color: var(--color-text-secondary);
}

.status-item {
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.status-item span {
    font-weight: 600;
    margin-left: 4px;
    color: var(--color-primary);
}

.status-spacer {
    flex: 1;
}

/* 对话框 */
.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 200;
    transition: opacity 0.2s ease;
}

.dialog-overlay.hidden {
    display: none;
    opacity: 0;
}

.dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 300;
    min-width: 300px;
    max-width: 500px;
    background-color: var(--color-bg);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.dialog.hidden {
    display: none;
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.9);
}

.dialog-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.dialog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
}

.dialog-header h3 {
    margin: 0;
    font-size: 16px;
}

.dialog-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0;
    transition: color 0.2s ease;
}

.dialog-close:hover {
    color: var(--color-text);
}

.dialog-body {
    padding: 16px;
    flex: 1;
    overflow-y: auto;
}

.dialog-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 16px;
    border-top: 1px solid var(--color-border);
}

/* 按钮 */
.btn {
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-secondary);
}

/* 表单元素 */
input[type="text"],
input[type="url"],
textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: inherit;
    font-size: 14px;
    transition: border-color 0.2s ease;
}

input[type="text"]:focus,
input[type="url"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.1);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

/* 全屏模式 */
.fullscreen-mode {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    background-color: var(--color-bg);
}

.fullscreen-mode .toolbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1001;
}

.fullscreen-mode .container {
    position: fixed;
    top: 48px;
    left: 0;
    right: 0;
    bottom: 35px;
}

.fullscreen-mode .statusbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1001;
}

/* 模式特定样式 */
.mode-edit .preview-container,
.mode-preview .editor-container,
.mode-preview .splitter {
    display: none;
}

.mode-edit .editor-container {
    flex: 1;
}

.mode-preview .preview-container {
    flex: 1;
    border-left: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .toolbar {
        gap: 4px;
        padding: 6px 8px;
    }

    .toolbar-divider {
        margin: 0 2px;
    }

    .container {
        flex-direction: column;
    }

    .splitter {
        width: 100%;
        height: 4px;
        cursor: row-resize;
    }

    .preview-container {
        border-left: none;
        border-top: 1px solid var(--color-border);
    }

    .preview {
        padding: 16px;
    }

    .statusbar {
        gap: 8px;
        padding: 6px 8px;
        font-size: 11px;
        overflow-x: auto;
    }
}

/* 打印样式 */
@media print {
    .toolbar,
    .statusbar,
    .splitter,
    .editor-container {
        display: none;
    }

    .preview-container {
        border: none;
        overflow: visible;
    }

    .preview {
        max-width: 100%;
    }
}