/* ============================
   CSS 变量 – 主题（亮色/暗色）
   ============================ */
:root {
    /* 主色 – 蓝色系 */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #dbeafe;

    /* 中性色 – 灰度系 */
    --color-bg: #f8fafc;
    --color-bg-panel: #ffffff;
    --color-bg-toolbar: #ffffff;
    --color-bg-footer: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-shadow: rgba(0, 0, 0, 0.06);

    /* 组件变量 */
    --radius: 8px;
    --transition: 0.2s ease;
    --max-width: 1440px;
    --gap: 20px;
}

[data-theme="dark"] {
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-primary-light: #1e293b;

    --color-bg: #0f172a;
    --color-bg-panel: #1e293b;
    --color-bg-toolbar: #1e293b;
    --color-bg-footer: #0f172a;
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #475569;
    --color-border: #334155;
    --color-shadow: rgba(0, 0, 0, 0.3);
}

/* ============================
   全局重置 & 基础
   ============================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text-primary);
    display: flex;
    flex-direction: column;
    transition: background var(--transition), color var(--transition);
}

/* ============================
   滚动条
   ============================ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* ============================
   顶部工具栏（全宽）
   ============================ */
.toolbar {
    background: var(--color-bg-toolbar);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 20px;
    flex-shrink: 0;
    display: flex;
    justify-content: center;
}
.toolbar-inner {
    width: 100%;
    max-width: var(--max-width);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.toolbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
    user-select: none;
}
.toolbar-brand .icon {
    font-size: 24px;
}
.toolbar-brand .version {
    font-size: 12px;
    font-weight: 400;
    color: var(--color-text-muted);
    background: var(--color-bg);
    padding: 0 10px;
    border-radius: 12px;
    line-height: 20px;
}

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

/* 顶部工具栏按钮 */
.toolbar-actions .btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: none;
    border-radius: var(--radius);
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}
.toolbar-actions .btn-ghost:hover {
    background: var(--color-bg);
    color: var(--color-text-primary);
}
.toolbar-actions .btn-ghost:active {
    transform: scale(0.96);
}

/* ============================
   主容器（居中，宽度 1440px）
   ============================ */
.main-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 20px 20px 0 20px;
    min-height: 0;
}
.main {
    width: 100%;
    max-width: var(--max-width);
    display: flex;
    gap: var(--gap);
    min-height: 0;
}

/* ============================
   左右面板通用
   ============================ */
.editor-panel,
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px var(--color-shadow);
    overflow: hidden;
    min-width: 0;
    transition: background var(--transition), border-color var(--transition);
}

/* ============================
   面板头部
   ============================ */
.panel-header {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-toolbar);
    flex-shrink: 0;
    gap: 10px;
}
.panel-header .badge {
    font-size: 11px;
    color: var(--color-text-muted);
    background: var(--color-bg);
    padding: 0 10px;
    border-radius: 12px;
    line-height: 20px;
}

/* ============================
   统一按钮样式
   ============================ */
.panel-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 通用按钮基础样式 */
.panel-actions .btn-action {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border: 1px solid transparent;
    border-radius: 6px;
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    height: 28px;
    line-height: 1;
}

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

.panel-actions .btn-action:active {
    transform: scale(0.96);
}

/* 带图标的按钮 */
.panel-actions .btn-action .icon {
    font-size: 14px;
    line-height: 1;
}

/* 主要操作按钮（导出、导入） */
.panel-actions .btn-action.primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.panel-actions .btn-action.primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    color: #fff;
}

/* 危险操作按钮（清空） */
.panel-actions .btn-action.danger {
    color: #ef4444;
}

.panel-actions .btn-action.danger:hover {
    background: #fef2f2;
    border-color: #fca5a5;
}

[data-theme="dark"] .panel-actions .btn-action.danger:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.3);
}

/* 源码切换按钮（激活状态） */
.panel-actions .btn-action.source-active {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* 展开按钮 */
.panel-actions .btn-action.expand {
    font-size: 16px;
    padding: 4px 8px;
}

/* 文件上传包装器 */
.panel-actions .file-input-wrap {
    position: relative;
    display: inline-flex;
}

.panel-actions .file-input-wrap input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
}

/* ============================
   编辑器主体
   ============================ */
.editor-body {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

.line-numbers {
    padding: 14px 0 14px 12px;
    font-family: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.7;
    color: var(--color-text-muted);
    text-align: right;
    user-select: none;
    overflow: hidden;
    min-width: 38px;
    flex-shrink: 0;
    background: var(--color-bg-panel);
    border-right: 1px solid var(--color-border);
    opacity: 0.6;
}
.line-numbers .line-num {
    display: block;
    padding-right: 8px;
}

.editor-textarea {
    flex: 1;
    padding: 14px 18px;
    font-family: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 14px;
    line-height: 1.7;
    border: none;
    outline: none;
    resize: none;
    background: var(--color-bg-panel);
    color: var(--color-text-primary);
    tab-size: 2;
    transition: background var(--transition), color var(--transition);
}
.editor-textarea::placeholder {
    color: var(--color-text-muted);
}

/* ============================
   预览主体
   ============================ */
.preview-body {
    flex: 1;
    padding: 20px 24px;
    overflow: auto;
    background: var(--color-bg-panel);
    display: flex;
    flex-direction: column;
}

.preview-body .markdown-body {
    background: transparent !important;
    color: var(--color-text-primary) !important;
    font-size: 15px;
    line-height: 1.8;
    max-width: 820px;
    margin: 0 auto;
}
.preview-body .markdown-body pre {
    background: var(--color-bg) !important;
    border-radius: var(--radius);
    padding: 16px !important;
}
.preview-body .markdown-body code {
    background: var(--color-bg);
    border-radius: 4px;
    padding: 2px 6px;
}
.preview-body .markdown-body table {
    border-color: var(--color-border);
}
.preview-body .markdown-body th,
.preview-body .markdown-body td {
    border-color: var(--color-border);
    padding: 8px 12px;
}
.preview-body .markdown-body blockquote {
    border-left-color: var(--color-primary);
    color: var(--color-text-secondary);
    background: var(--color-bg);
    padding: 8px 16px;
    border-radius: 0 var(--radius) var(--radius) 0;
}
.preview-body .markdown-body a {
    color: var(--color-primary);
}
.preview-body .markdown-body a:hover {
    text-decoration: underline;
}

/* 空状态 */
.preview-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-text-muted);
    user-select: none;
    flex: 1;
}
.preview-empty .icon {
    font-size: 48px;
    margin-bottom: 14px;
    opacity: 0.5;
}
.preview-empty .title {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-secondary);
}
.preview-empty .hint {
    font-size: 13px;
    opacity: 0.6;
    margin-top: 4px;
}

/* ============================
   HTML 源码视图
   ============================ */
.source-view {
    display: none;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.source-view.active {
    display: flex;
}

.source-toolbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 6px 12px;
    background: var(--color-bg-toolbar);
    border-bottom: 1px solid var(--color-border);
    border-radius: var(--radius) var(--radius) 0 0;
    flex-shrink: 0;
    gap: 8px;
}

.source-toolbar .source-label {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-right: auto;
    font-weight: 500;
}

.source-toolbar .btn-copy-source {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-bg-panel);
    color: var(--color-text-secondary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    height: 28px;
    line-height: 1;
}

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

.source-toolbar .btn-copy-source:active {
    transform: scale(0.96);
}

.source-toolbar .btn-copy-source.copied {
    background: #22c55e;
    color: #fff;
    border-color: #22c55e;
}

.source-toolbar .btn-copy-source .icon {
    font-size: 13px;
}

.source-body {
    flex: 1;
    overflow: auto;
    background: var(--color-bg);
    border-radius: 0 0 var(--radius) var(--radius);
}

.html-source {
    margin: 0;
    padding: 16px 20px;
    font-family: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.7;
    overflow: auto;
    color: var(--color-text-primary);
    white-space: pre-wrap;
    word-break: break-all;
    height: 100%;
    background: var(--color-bg);
    border-radius: 0 0 var(--radius) var(--radius);
}

.html-source code {
    background: transparent !important;
    padding: 0 !important;
    font-size: inherit;
}

/* ============================
   面板底部统计
   ============================ */
.panel-footer {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 6px 16px;
    font-size: 12px;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-toolbar);
    flex-shrink: 0;
    flex-wrap: wrap;
}
.panel-footer .num {
    font-weight: 500;
    color: var(--color-text-primary);
}
#previewStatus {
    color: var(--color-text-secondary);
}
#previewStatus.success {
    color: #22c55e;
}
#previewStatus.error {
    color: #ef4444;
}

/* ============================
   分割条
   ============================ */
.resizer {
    width: 4px;
    background: transparent;
    cursor: col-resize;
    flex-shrink: 0;
    position: relative;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
    margin: 0 -2px;
}
.resizer:hover,
.resizer.active {
    background: var(--color-primary);
}
.resizer .resizer-handle {
    width: 2px;
    height: 32px;
    background: var(--color-border);
    border-radius: 2px;
    transition: background 0.2s;
}
.resizer:hover .resizer-handle,
.resizer.active .resizer-handle {
    background: #fff;
}
.resizer::after {
    content: '';
    position: absolute;
    inset: 0 -6px;
}

/* ============================
   底部版权（全宽）
   ============================ */
.main-footer {
    background: var(--color-bg-footer);
    border-top: 1px solid var(--color-border);
    padding: 12px 20px;
    flex-shrink: 0;
    display: flex;
    justify-content: center;
    margin-top: 20px;
}
.footer-inner {
    width: 100%;
    max-width: var(--max-width);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px 16px;
    font-size: 13px;
    color: var(--color-text-secondary);
}
.footer-inner a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}
.footer-inner a:hover {
    text-decoration: underline;
}
.footer-links {
    display: flex;
    gap: 16px;
}

/* ============================
   Toast
   ============================ */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(16px);
    background: var(--color-bg-panel);
    color: var(--color-text-primary);
    padding: 10px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: 0 8px 24px var(--color-shadow);
    font-size: 14px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
    z-index: 999;
    white-space: nowrap;
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============================
   交互状态
   ============================ */
.editor-panel.drag-over {
    outline: 2px dashed var(--color-primary);
    outline-offset: -4px;
    background: var(--color-primary-light);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.rendering .preview-body {
    animation: pulse 0.6s ease-in-out 2;
}

/* ============================
   响应式
   ============================ */
@media (max-width: 1024px) {
    .main {
        flex-direction: column;
    }
    .resizer {
        width: 100%;
        height: 4px;
        cursor: row-resize;
        margin: 0;
    }
    .resizer .resizer-handle {
        width: 32px;
        height: 2px;
    }
    .resizer::after {
        inset: -6px 0;
    }
    .editor-panel,
    .preview-panel {
        min-height: 300px;
    }
}

@media (max-width: 820px) {
    .main-wrapper {
        padding: 12px 12px 0 12px;
    }
    .toolbar-brand span:not(.icon) {
        display: none;
    }
    .line-numbers {
        display: none;
    }
    .preview-body {
        padding: 14px 16px;
    }
    .panel-footer {
        gap: 12px;
        font-size: 11px;
        padding: 4px 12px;
    }
    .panel-actions .btn-action .label {
        display: none;
    }
    .panel-actions .btn-action {
        padding: 4px 8px;
        font-size: 13px;
    }
    .panel-actions .btn-action .icon {
        font-size: 15px;
    }
    .source-toolbar .btn-copy-source .label {
        display: none;
    }
}

@media (max-width: 480px) {
    .main-wrapper {
        padding: 8px 8px 0 8px;
    }
    .main {
        gap: 10px;
    }
    .toolbar {
        padding: 8px 12px;
    }
    .toolbar-actions .btn-ghost {
        padding: 4px 8px;
        font-size: 12px;
    }
    .editor-textarea {
        font-size: 13px;
        padding: 10px 14px;
    }
    .preview-body .markdown-body {
        font-size: 14px;
    }
    .panel-header {
        padding: 6px 12px;
        font-size: 12px;
    }
    .panel-actions {
        gap: 2px;
    }
    .panel-actions .btn-action {
        padding: 3px 6px;
        font-size: 12px;
        height: 24px;
    }
    .panel-actions .btn-action .icon {
        font-size: 13px;
    }
    .source-toolbar {
        padding: 4px 10px;
    }
    .source-toolbar .btn-copy-source {
        padding: 2px 8px;
        font-size: 11px;
        height: 24px;
    }
    .main-footer {
        padding: 8px 12px;
        font-size: 12px;
    }
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    .footer-links {
        gap: 12px;
    }
}
/* ============================
   工具导航（新增）
   ============================ */
.toolbar-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 20px;
    padding-left: 20px;
    border-left: 1px solid var(--color-border);
}

.toolbar-nav .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.toolbar-nav .nav-link:hover {
    background: var(--color-bg);
    color: var(--color-text-primary);
}

.toolbar-nav .nav-link.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.toolbar-nav .nav-link .nav-icon {
    font-size: 15px;
}

.toolbar-nav .nav-separator {
    color: var(--color-text-muted);
    font-size: 12px;
}

/* 表格预览样式（Excel 页面专用） */
.table-preview {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.table-preview .source-toolbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 6px 12px;
    background: var(--color-bg-toolbar);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
    gap: 8px;
}

.table-preview .source-toolbar .source-label {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-right: auto;
    font-weight: 500;
}

.table-preview .source-body {
    flex: 1;
    overflow: auto;
    padding: 12px 16px;
    background: var(--color-bg-panel);
}

.table-preview table {
    border-collapse: collapse;
    width: 100%;
    font-size: 13px;
}

.table-preview th,
.table-preview td {
    border: 1px solid var(--color-border);
    padding: 6px 12px;
    text-align: left;
}

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

@media (max-width: 820px) {
    .toolbar-nav {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        gap: 2px;
        flex-wrap: wrap;
    }
    .toolbar-nav .nav-link {
        font-size: 12px;
        padding: 2px 8px;
    }
    .toolbar-nav .nav-link .nav-label {
        display: none;
    }
    .toolbar-nav .nav-separator {
        display: none;
    }
    .table-preview .source-toolbar .source-label {
        font-size: 11px;
    }
}
/* ============================
   工具介绍（居中，置顶）
   ============================ */
.tool-intro {
    background: var(--color-bg-panel);
    border-bottom: 1px solid var(--color-border);
    padding: 20px 20px 16px 20px;
    display: flex;
    justify-content: center;
    flex-shrink: 0;
}

.tool-intro-inner {
    width: 100%;
    max-width: var(--max-width);
    text-align: center;
}

.tool-intro-inner .intro-icon {
    font-size: 32px;
    margin-bottom: 6px;
}

.tool-intro-inner h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}

.tool-intro-inner p {
    font-size: 14px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ============================
   底部信息栏（支持格式 + 使用提示 两栏）
   ============================ */
.tool-bottom {
    background: var(--color-bg-panel);
    border-top: 1px solid var(--color-border);
    padding: 16px 20px 12px 20px;
    display: flex;
    justify-content: center;
    flex-shrink: 0;
}

.tool-bottom-inner {
    width: 100%;
    max-width: var(--max-width);
}

.bottom-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.bottom-item {
    display: flex;
    flex-direction: column;
}

.bottom-item .bottom-icon {
    font-size: 20px;
    margin-bottom: 4px;
}

.bottom-item h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}

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

.bottom-list li {
    font-size: 13px;
    line-height: 1.8;
    color: var(--color-text-secondary);
    padding: 1px 0;
}

.bottom-list .tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 0 8px;
    border-radius: 4px;
    margin-right: 4px;
    min-width: 32px;
    text-align: center;
}

.bottom-list code {
    font-family: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 12px;
    background: var(--color-bg);
    padding: 0 6px;
    border-radius: 4px;
    color: var(--color-text-primary);
}

.bottom-list .key {
    display: inline-block;
    font-size: 11px;
    font-family: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
    background: var(--color-bg);
    padding: 0 6px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    margin: 0 2px;
}

/* ============================
   响应式
   ============================ */
@media (max-width: 820px) {
    .tool-intro-inner h2 {
        font-size: 17px;
    }
    .tool-intro-inner p {
        font-size: 13px;
    }
    .bottom-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .tool-bottom {
        padding: 12px 16px;
    }
}

@media (max-width: 480px) {
    .tool-intro {
        padding: 14px 16px 12px 16px;
    }
    .tool-intro-inner .intro-icon {
        font-size: 24px;
    }
    .tool-intro-inner h2 {
        font-size: 15px;
    }
    .tool-intro-inner p {
        font-size: 12px;
    }
    .bottom-list li {
        font-size: 12px;
    }
}