/* CSS 变量定义 */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --text-primary: #1e293b;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --text-light: #475569;
    --background-light: #f8fafc;
    --background-gray: #f1f5f9;
    --border-color: #e2e8f0;
    --border-light: #cbd5e1;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
}

/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background-light);
    color: var(--text-secondary);
    line-height: 1.6;
    overflow: hidden;
}

/* 主应用容器 */
.app {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 顶部工具栏 */
.toolbar {
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.toolbar-left h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.toolbar-left h1 .app-icon {
    width: 24px;
    height: 24px;
    margin-right: 4px;
    vertical-align: middle;
}

.toolbar-left h1 i {
    color: var(--primary-color);
}

.subtitle {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 400;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mode-group {
    display: flex;
    gap: 8px;
    margin-right: 16px; /* 与右侧自定义/导出拉开距离 */
}

.btn-toggle.active {
    background: var(--primary-color);
    color: #fff;
    border-color: transparent;
}

.btn-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* 不同模式选中态颜色 */
#modeXhsBtn.active {
    background: #ef4444; /* 红色 */
}

#modePyqBtn.active {
    background: #10b981; /* 绿色 */
}

/* 按钮样式 */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--background-gray);
    color: var(--text-light);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

/* 主内容区域 */
.main-content {
    flex: 1;
    display: flex;
    height: calc(100vh - 73px);
}

/* 面板通用样式 */
.editor-panel,
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
    border-right: 1px solid #e2e8f0;
}

.preview-panel {
    border-right: none;
}

.panel-header {
    padding: 16px 28px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f8fafc;
}

.panel-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: #1e293b;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 编辑器工具栏 */
.editor-tools,
.preview-tools {
    display: flex;
    gap: 4px;
    align-items: center;
}

/* 预览工具栏特殊样式，确保与右侧工具栏对齐 */
.preview-panel .panel-header {
    padding-right: 75px;
}

.preview-tools {
    gap: 8px;
}

.tool-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: #64748b;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.tool-btn:hover {
    background: #e2e8f0;
    color: #475569;
}

.zoom-level {
    font-size: 12px;
    color: #64748b;
    padding: 0 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 45px;
    font-weight: 500;
}

/* Markdown 编辑器 */
#markdownInput {
    flex: 1;
    border: none;
    padding: 20px;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    outline: none;
    background: #fafafa;
    color: #374151;
}

#markdownInput::placeholder {
    color: #9ca3af;
}

/* 预览容器 */
.preview-container {
    flex: 1;
    overflow: auto;
    background: #f1f5f9;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.preview-content {
    transform-origin: top center;
    transition: transform 0.2s ease;
}

/* Markdown 海报样式 */
.markdown-poster {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 0;
    padding: 40px;
    margin: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    width: 640px; /* 视觉宽度（内容卡片外层） */
    min-height: 600px;
    position: relative;
    overflow: hidden;
}

/* 小红书模式下，为了与导出一致，使用 border-box 宽度模型 */
.markdown-poster[data-mode="xhs"] {
    box-sizing: border-box;
}

.markdown-poster[data-mode="pyq"] {
    box-sizing: border-box;
}

.markdown-poster::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0;
    pointer-events: none;
}

.poster-content {
    background: rgba(255, 255, 255, 0.95) !important;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 1;
    overflow: hidden;
    word-wrap: break-word;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}


/* 空内容提示样式 */
.empty-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 40px;
    color: var(--text-muted);
    min-height: 400px;
}

.empty-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
    opacity: 0.8;
}

.empty-preview h3 {
    font-size: 24px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 600;
}

.empty-preview > p {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 32px;
    line-height: 1.5;
}

.empty-tips {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 320px;
}

.tip-item {
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
    padding: 12px 16px;
    background: rgba(99, 102, 241, 0.05);
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
}

.tip-item i {
    color: var(--primary-color);
    font-size: 14px;
    width: 16px;
    flex-shrink: 0;
}

.tip-item span {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.4;
}

/* Markdown 内容样式 */
.poster-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 16px 0;
    box-shadow: var(--shadow-md);
    display: block;
    object-fit: cover;
}

.poster-content video,
.poster-content iframe {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 16px 0;
    display: block;
}

.poster-content table {
    width: 100%;
    max-width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
    overflow-x: auto;
    display: block;
    white-space: nowrap;
}

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

.poster-content table th {
    background: var(--background-light);
    font-weight: 600;
}

.poster-content h1 {
    font-size: var(--dynamic-h1-size, 28px);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.poster-content h2 {
    font-size: var(--dynamic-h2-size, 22px);
    font-weight: 600;
    color: var(--text-secondary);
    margin: 24px 0 12px 0;
    line-height: 1.4;
}

.poster-content h3 {
    font-size: var(--dynamic-h3-size, 18px);
    font-weight: 600;
    color: var(--text-light);
    margin: 20px 0 8px 0;
}

.poster-content p {
    font-size: var(--dynamic-font-size, 16px);
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.7;
}

/* Markdown 空行（可视化占位） */
.poster-content .md-empty-line {
    height: 1em;
    line-height: 1em;
    margin: 8px 0;
    opacity: 0.2;
}

.poster-content em {
    font-style: italic;
    color: var(--primary-color);
}

.poster-content strong {
    font-weight: 700;
    color: var(--text-primary);
}

.poster-content a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid var(--primary-color);
    transition: all 0.2s ease;
}

.poster-content a:hover {
    color: var(--primary-hover);
    border-bottom-color: var(--primary-hover);
}

.poster-content ul,
.poster-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.poster-content li {
    font-size: var(--dynamic-font-size, 16px);
    color: var(--text-light);
    margin-bottom: 8px;
    line-height: 1.6;
    display: list-item;
}

.poster-content li a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid var(--primary-color);
    display: inline;
}

.poster-content li code {
    background: var(--background-gray);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: var(--dynamic-code-size, 14px);
    color: var(--primary-color);
    display: inline;
    vertical-align: baseline;
    line-height: inherit;
}

.poster-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--text-muted);
    font-style: italic;
    font-size: var(--dynamic-quote-size, 16px);
}

.poster-content code {
    background: var(--background-gray);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: var(--dynamic-code-size, 14px);
    color: var(--primary-color);
    display: inline;
    line-height: inherit;
    vertical-align: baseline;
}

.poster-content pre {
    background: var(--text-primary);
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 16px 0;
    display: block;
}

.poster-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    display: inline;
}

/* 背景自定义面板 */
.background-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    max-width: 500px;
    width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.background-panel.active {
    opacity: 1;
    pointer-events: all;
}

.background-panel .panel-content {
    padding: 24px;
}

.background-panel h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.setting-section {
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e2e8f0;
}

.setting-section:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
}

.setting-section h4 {
    font-size: 16px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider-group input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #e2e8f0;
    outline: none;
    cursor: pointer;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #6366f1;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.slider-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #6366f1;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.slider-value {
    font-size: 14px;
    color: #6366f1;
    font-weight: 500;
    min-width: 50px;
    text-align: right;
}

.background-options {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.option-group label {
    font-size: 14px;
    font-weight: 500;
    color: #374151;
}

.preset-backgrounds {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.bg-preset {
    width: 60px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.2s ease;
}

.bg-preset:hover {
    transform: scale(1.05);
}

.bg-preset.active {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

/* 背景预设样式 */
.bg-preset[data-bg="gradient1"] {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.bg-preset[data-bg="gradient2"] {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.bg-preset[data-bg="gradient3"] {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.bg-preset[data-bg="gradient4"] {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.bg-preset[data-bg="gradient5"] {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.bg-preset[data-bg="gradient6"] {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

.bg-preset[data-bg="gradient7"] {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
}

.bg-preset[data-bg="gradient8"] {
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
}

.color-inputs {
    display: flex;
    gap: 16px;
}

.color-input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.color-input-group label {
    font-size: 12px;
    color: #64748b;
}

input[type="color"] {
    width: 100%;
    height: 40px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    cursor: pointer;
    background: none;
}

select {
    padding: 8px 12px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    color: #374151;
    background: white;
    cursor: pointer;
}

.panel-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    justify-content: flex-end;
}

/* 遮罩层 */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .editor-panel,
    .preview-panel {
        height: 50vh;
    }
    
    .toolbar {
        padding: 8px 16px;
    }
    
    .toolbar-left h1 {
        font-size: 18px;
    }
    
    .subtitle {
        display: none;
    }
    
    .markdown-poster {
        width: calc(100vw - 40px);
        max-width: 640px;
        margin: 10px;
        padding: 20px;
    }
    
    .poster-content {
        padding: 20px;
    }
}

/* 缩放控制 */
.preview-content.zoom-75 {
    transform: scale(0.75);
}

.preview-content.zoom-50 {
    transform: scale(0.5);
}

.preview-content.zoom-125 {
    transform: scale(1.25);
}

.preview-content.zoom-150 {
    transform: scale(1.5);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.poster-content {
    animation: fadeIn 0.5s ease;
}

/* 工具提示 */
.tool-btn[title]:hover::after {
    content: attr(title);
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    background: #1e293b;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    z-index: 1000;
}

.tool-btn {
    position: relative;
}

/* GitHub 链接样式 */
.github-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: none;
    color: #24292e;
    border-radius: 50%;
    text-decoration: none;
    font-size: 18px;
    transition: all 0.2s ease;
    margin-left: 4px;
}

.github-link:hover {
    color: #6366f1;
    transform: scale(1.1);
}

.github-link i {
    color: inherit;
}