/* ============================================
   Phone Image Template System
   用于生成手机端分享图片的CSS框架
   渲染宽度540px, html2canvas scale=2 输出1080px
   注意: 仅使用html2canvas兼容的CSS属性
   支持: flexbox, border-radius, box-shadow, background-color,
         font, padding, margin, border, position(relative/absolute/fixed)
   不支持: transform, filter, clip-path, backdrop-filter,
           CSS grid, object-fit, position:sticky, CSS animations
   ============================================ */

/* --- CSS Custom Properties (小红书经典风格) --- */
:root {
    /* 字号 */
    --pi-font-size-base: 14px;
    --pi-font-size-title: 26px;
    --pi-font-size-subtitle: 16px;
    --pi-font-size-small: 12px;
    /* 行高 */
    --pi-line-height: 1.8;
    /* 间距 */
    --pi-spacing: 20px;
    --pi-spacing-sm: 10px;
    --pi-spacing-lg: 30px;
    --pi-spacing-xs: 5px;
    /* 颜色 */
    --pi-color-text: #333333;
    --pi-color-text-light: #666666;
    --pi-color-text-lighter: #999999;
    --pi-color-bg: #ffffff;
    --pi-color-accent: #1890ff;
    --pi-color-border: #eeeeee;
    /* 圆角 */
    --pi-radius: 12px;
    /* 字体 */
    --pi-font-family: 'Source Han Sans', 'SourceHanSans-Normal', sans-serif;
}

/* ============================================
   Base Container
   固定540px宽度的最外层容器
   ============================================ */
.phone-image-container {
    width: 540px;
    background: var(--pi-color-bg);
    color: var(--pi-color-text);
    font-family: var(--pi-font-family);
    font-size: var(--pi-font-size-base);
    line-height: var(--pi-line-height);
    overflow: hidden;
    position: relative;
}

/* ============================================
   Page Container
   每一页的容器, 尺寸由 size class 控制
   ============================================ */
.phone-image-page {
    overflow: hidden;
    box-sizing: border-box;
    position: relative;
}

/* ============================================
   Size Variants
   两种主流手机图片尺寸
   ============================================ */

/* 小红书尺寸 540x720 (输出1080x1440) */
.size-xiaohongshu .phone-image-page {
    width: 540px;
    height: 720px;
}

/* 抖音尺寸 540x960 (输出1080x1920) */
.size-douyin .phone-image-page {
    width: 540px;
    height: 960px;
}

/* ============================================
   Page Type Variants
   三种页面类型: 封面页/内容页/总结页
   ============================================ */

/* --- 封面页/首页 --- */
.page-cover {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--pi-spacing-lg);
    text-align: center;
}

.page-cover .cover-title {
    font-size: 28px;
    font-weight: normal;
    letter-spacing: 2px;
    line-height: 1.5;
    margin-bottom: var(--pi-spacing);
    color: var(--pi-color-text);
    word-break: break-word;
}

.page-cover .cover-subtitle {
    font-size: var(--pi-font-size-subtitle);
    color: var(--pi-color-text-light);
    margin-bottom: var(--pi-spacing);
}

.page-cover .cover-image {
    width: 100%;
    margin-bottom: var(--pi-spacing);
}

.page-cover .cover-meta {
    font-size: var(--pi-font-size-small);
    color: var(--pi-color-text-lighter);
    margin-top: var(--pi-spacing-sm);
}

/* --- 封面页 - 无封面图装饰排版 --- */
.page-cover.no-cover-image {
    justify-content: center;
    padding: var(--pi-spacing-lg);
}

.page-cover.no-cover-image .cover-decor-line {
    position: absolute;
    left: 30px;
    right: 30px;
    height: 2px;
    background: var(--pi-color-border);
}

.page-cover.no-cover-image .cover-decor-top {
    top: 80px;
}

.page-cover.no-cover-image .cover-decor-bottom {
    bottom: 80px;
}

.page-cover.no-cover-image .cover-no-img-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--pi-spacing) 0;
}

.page-cover.no-cover-image .cover-no-img-title {
    font-size: 36px;
    font-weight: bold;
    line-height: 1.4;
    color: var(--pi-color-text);
    word-break: break-word;
    margin-bottom: var(--pi-spacing);
    padding: 0 20px;
}

.page-cover.no-cover-image .cover-decor-divider {
    width: 60px;
    height: 3px;
    background: var(--pi-color-accent);
    margin-bottom: var(--pi-spacing);
}

.page-cover.no-cover-image .cover-no-img-desc {
    font-size: var(--pi-font-size-subtitle);
    color: var(--pi-color-text-light);
    line-height: 1.8;
    margin-bottom: var(--pi-spacing);
    padding: 0 30px;
    word-break: break-word;
}

.page-cover.no-cover-image .cover-no-img-meta {
    display: flex;
    gap: 15px;
    font-size: var(--pi-font-size-small);
    color: var(--pi-color-text-lighter);
    flex-wrap: wrap;
    justify-content: center;
}

/* --- 内容页图片强制约束 --- */
.page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
    margin: 10px 0;
}

/* --- 内容页 --- */
.page-body {
    display: flex;
    flex-direction: column;
    padding: var(--pi-spacing);
}

/* 内容页 - 页头区域 */
.page-header {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 20px;
}

.page-header .page-title {
    font-size: 20px;
    font-weight: normal;
    letter-spacing: 1px;
    color: #666;
    line-height: 1.4;
    word-break: break-word;
}

.page-header .page-subtitle {
    font-size: var(--pi-font-size-subtitle);
    color: var(--pi-color-text-light);
    margin-top: var(--pi-spacing-sm);
}

/* 内容页 - 正文区域 */
.page-content {
    flex: 1;
    overflow: hidden;
    word-break: break-word;
    line-height: 2.0;
}

.page-content p {
    text-indent: 2em;
    margin-bottom: 16px;
    color: #333;
}

.page-content h2 {
    font-weight: normal;
    font-size: 18px;
    letter-spacing: 1px;
    margin-top: 24px;
    margin-bottom: 12px;
    color: #333;
}

.page-content h3 {
    font-weight: normal;
    font-size: 16px;
    margin-top: 20px;
    margin-bottom: 10px;
    color: #555;
}

.page-content h4 {
    font-size: var(--pi-font-size-base);
    font-weight: bold;
    margin-top: var(--pi-spacing-sm);
    margin-bottom: 5px;
}

.page-content h5 {
    font-size: 13px;
    font-weight: bold;
    margin-top: var(--pi-spacing-sm);
    margin-bottom: 5px;
}

.page-content h6 {
    font-size: 12px;
    font-weight: bold;
    margin-top: var(--pi-spacing-sm);
    margin-bottom: 5px;
    color: var(--pi-color-text-light);
}

.page-content blockquote {
    border-left: 1px solid #ccc;
    font-style: normal;
    color: #888;
    padding-left: 15px;
    margin: var(--pi-spacing-sm) 0;
}

.page-content ul,
.page-content ol {
    padding-left: var(--pi-spacing);
    margin-bottom: var(--pi-spacing-sm);
}

.page-content li {
    margin-bottom: 5px;
}

/* 内容页 - 页脚区域 */
.page-footer {
    border-top: none;
    padding-top: 0;
    margin-top: var(--pi-spacing-sm);
    font-size: 11px;
    color: #bbb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* --- 总结页/尾页 --- */
.page-summary {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--pi-spacing-lg);
    text-align: center;
}

.page-summary .summary-title {
    font-weight: normal;
    letter-spacing: 2px;
    font-size: 22px;
    margin-bottom: var(--pi-spacing);
    color: var(--pi-color-text);
}

.page-summary .summary-text {
    font-size: var(--pi-font-size-subtitle);
    color: #aaa;
    font-weight: normal;
    margin-bottom: var(--pi-spacing);
    line-height: 1.6;
}

.page-summary .summary-qr {
    margin-bottom: var(--pi-spacing-sm);
}

.page-summary .summary-footer {
    font-size: var(--pi-font-size-small);
    color: #ccc;
}

/* ============================================
   Font Variants
   ============================================ */
.font-source-han-sans {
    --pi-font-family: 'Source Han Sans', 'SourceHanSans-Normal', sans-serif;
}

/* ============================================
   Article Images
   文章内图片样式
   ============================================ */

/* 行内图片, 有边距 */
.article-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: var(--pi-spacing) 0;
}

/* 全宽图片, 无边距 */
.article-image-full {
    width: 100%;
    height: auto;
    display: block;
    margin: 0;
}

/* ============================================
   Page Number Indicator
   页码指示器
   ============================================ */
.page-number-indicator {
    position: absolute;
    bottom: 10px;
    right: 15px;
    font-size: var(--pi-font-size-small);
    color: var(--pi-color-text-lighter);
}

/* ============================================
   Vertical Alignment (逐页对齐)
   ============================================ */
.page-body.valign-center .page-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* ============================================
   Content Flow (中间栏内容流)
   所有元素按实际尺寸纵向排列
   ============================================ */
.content-flow {
    width: 540px;
    padding: 20px;
    box-sizing: border-box;
    background: #fff;
    min-height: 100%;
}

.content-flow-block {
    position: relative;
    margin-bottom: 0;
}

.content-flow-block img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- 分页插入区域 --- */
.break-inserter {
    height: 20px;
    border-top: 1px dashed #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 2px 0;
    cursor: pointer;
}

.break-inserter:hover {
    border-color: var(--pi-color-accent);
    background: rgba(24, 144, 255, 0.05);
}

.break-inserter-btn {
    opacity: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--pi-color-accent);
    color: #fff;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    border: none;
    cursor: pointer;
    padding: 0;
}

.break-inserter:hover .break-inserter-btn {
    opacity: 1;
}

/* --- 已插入的分页标记 --- */
.page-break-marker {
    height: 30px;
    background: #fff3f3;
    border: 1px dashed #ff4d4f;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 4px 0;
    position: relative;
}

.page-break-marker .break-marker-label {
    font-size: 12px;
    color: #ff4d4f;
    user-select: none;
}

.page-break-marker .remove-break-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    margin-top: -10px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #ff4d4f;
    color: #fff;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    border: none;
    cursor: pointer;
    padding: 0;
    opacity: 0;
}

.page-break-marker:hover .remove-break-btn {
    opacity: 1;
}

/* ============================================
   Preview Thumbnails (缩略图容器)
   ============================================ */
.preview-thumbnails {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 20px;
    height: 100%;
    padding: 0 10px;
}

.preview-thumb-item {
    position: relative;
    flex-shrink: 0;
    text-align: center;
}

.preview-thumb-item img {
    display: block;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.preview-thumb-page-num {
    display: block;
    text-align: center;
    font-size: 12px;
    color: #999;
    margin-top: 6px;
}

.thumb-alignment-toggle {
    position: absolute;
    top: 8px;
    right: 8px;
    z-index: 10;
    opacity: 0;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #666;
    user-select: none;
    border: none;
    padding: 0;
    cursor: pointer;
    transition: opacity 0.2s;
}

.preview-thumb-item:hover .thumb-alignment-toggle {
    opacity: 1;
}

.thumb-alignment-toggle:hover {
    background: rgba(0, 0, 0, 0.1);
}

.thumb-alignment-toggle.active-center {
    opacity: 1;
    background: rgba(24, 144, 255, 0.15);
    color: #1890ff;
}

/* ============================================
   Content Flow Code Blocks (中间栏代码块样式)
   仅用于编辑区中间栏, 不影响渲染页面
   ============================================ */

/* 表格美化样式（html2canvas兼容） */
.page-content table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 13px; }
.page-content th { background-color: #f0f0f0; font-weight: bold; padding: 8px 10px; border: 1px solid #ddd; text-align: left; }
.page-content td { padding: 8px 10px; border: 1px solid #ddd; }
.page-content tr:nth-child(even) td { background-color: #f9f9f9; }

.content-flow pre {
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    padding: 12px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.6;
    margin: 10px 0;
}

.content-flow code {
    font-family: 'Courier New', Consolas, monospace;
    font-size: 13px;
}

.content-flow pre code {
    background: none;
    border: none;
    padding: 0;
}

/* 中间栏表格样式 */
.content-flow-block table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 13px; }
.content-flow-block th { background-color: #f0f0f0; font-weight: bold; padding: 8px 10px; border: 1px solid #ddd; text-align: left; }
.content-flow-block td { padding: 8px 10px; border: 1px solid #ddd; }
.content-flow-block tr:nth-child(even) td { background-color: #f9f9f9; }