/* ============================================
   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 --- */
:root {
    /* 字号 */
    --pi-font-size-base: 14px;
    --pi-font-size-title: 24px;
    --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;
    /* 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;
    /* 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: 32px;
    font-weight: bold;
    line-height: 1.4;
    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 {
    padding-bottom: var(--pi-spacing-sm);
    margin-bottom: var(--pi-spacing);
    border-bottom: 1px solid var(--pi-color-border);
}

.page-header .page-title {
    font-size: var(--pi-font-size-title);
    font-weight: bold;
    line-height: 1.4;
    color: var(--pi-color-text);
    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;
}

.page-content p {
    margin-bottom: var(--pi-spacing-sm);
    text-indent: 2em;
}

.page-content h2 {
    font-size: 20px;
    font-weight: bold;
    margin-top: var(--pi-spacing);
    margin-bottom: var(--pi-spacing-sm);
}

.page-content h3 {
    font-size: var(--pi-font-size-subtitle);
    font-weight: bold;
    margin-top: var(--pi-spacing-sm);
    margin-bottom: var(--pi-spacing-sm);
}

.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: 3px solid var(--pi-color-accent);
    padding-left: var(--pi-spacing-sm);
    margin: var(--pi-spacing-sm) 0;
    color: var(--pi-color-text-light);
    font-style: italic;
}

.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 {
    padding-top: var(--pi-spacing-sm);
    margin-top: var(--pi-spacing-sm);
    border-top: 1px solid var(--pi-color-border);
    font-size: var(--pi-font-size-small);
    color: var(--pi-color-text-lighter);
    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-size: var(--pi-font-size-title);
    font-weight: bold;
    margin-bottom: var(--pi-spacing);
    color: var(--pi-color-text);
}

.page-summary .summary-text {
    font-size: var(--pi-font-size-subtitle);
    color: var(--pi-color-text-light);
    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: var(--pi-color-text-lighter);
}

/* ============================================
   Font Variants
   三种可选字体
   ============================================ */
.font-source-han-sans {
    --pi-font-family: 'Source Han Sans', 'SourceHanSans-Normal', sans-serif;
}

.font-alibaba-puhuiti {
    --pi-font-family: 'AlibabaPuHuiTi', sans-serif;
}

.font-lxgw-wenkai {
    --pi-font-family: 'LXGWWenKai', cursive;
}

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

/* ============================================
   Template Namespaces
   三个模板命名空间, 基础结构样式
   后续Task 8-10会填充详细样式
   ============================================ */

/* --- 简约文字卡片模板 --- */
.tpl-minimal {
    /* 基础结构: 白底黑字, 大量留白, 现代简约风格 */
}

/* 封面页 - 居中大标题 + 副标题 + 日期 */
.tpl-minimal .page-cover .cover-title {
    font-size: 28px;
    font-weight: normal;
    letter-spacing: 2px;
    line-height: 1.5;
}

.tpl-minimal .page-cover .cover-subtitle {
    font-weight: normal;
    letter-spacing: 1px;
    color: #999;
}

.tpl-minimal .page-cover .cover-meta {
    letter-spacing: 1px;
}

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

.tpl-minimal .page-header .page-title {
    font-size: 20px;
    font-weight: normal;
    letter-spacing: 1px;
    color: #666;
}

/* 内容页 - 正文区域: 宽行高(2.0), 大段落间距, 首行缩进2em */
.tpl-minimal .page-content {
    line-height: 2.0;
}

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

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

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

.tpl-minimal .page-content blockquote {
    border-left: 1px solid #ccc;
    font-style: normal;
    color: #888;
    padding-left: 15px;
}

.tpl-minimal .page-content .article-image {
    border-radius: 4px;
}

.tpl-minimal .page-content .article-image-full {
    border-radius: 0;
}

/* 内容页 - 页脚区域: 小号版权 + 页码, 细线分隔 */
.tpl-minimal .page-footer {
    border-top: none;
    padding-top: 0;
    font-size: 11px;
    color: #bbb;
}

/* 总结页/尾页 */
.tpl-minimal .page-summary .summary-title {
    font-weight: normal;
    letter-spacing: 2px;
    font-size: 22px;
}

.tpl-minimal .page-summary .summary-text {
    color: #aaa;
    font-weight: normal;
}

.tpl-minimal .page-summary .summary-footer {
    color: #ccc;
}

/* --- 杂志模板 - 完整样式 --- */
.tpl-magazine .page-cover {
    padding: 0;
    justify-content: flex-end;
    padding-bottom: 40px;
    position: relative;
}

.tpl-magazine .page-cover::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: #1890ff;
}

.tpl-magazine .page-cover .cover-title {
    font-size: 26px;
    font-weight: bold;
    line-height: 1.4;
    letter-spacing: 1px;
    position: relative;
    padding-bottom: 15px;
}

.tpl-magazine .page-cover .cover-subtitle {
    font-weight: normal;
    color: #666;
    letter-spacing: 0.5px;
}

.tpl-magazine .page-cover .cover-meta {
    position: relative;
    padding: 8px 12px;
    background: #f5f5f5;
    border-radius: 2px;
}

.tpl-magazine .page-header {
    border-bottom: 2px solid #1890ff;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.tpl-magazine .page-header .page-title {
    font-size: 22px;
    font-weight: bold;
    letter-spacing: 0.5px;
}

.tpl-magazine .page-content {
    line-height: 1.8;
}

.tpl-magazine .page-content p {
    margin-bottom: 14px;
    text-indent: 2em;
    color: #333;
}

.tpl-magazine .page-content p:first-child {
    text-indent: 0;
}

.tpl-magazine .page-content p:first-child::first-letter {
    font-size: 3.2em;
    font-weight: bold;
    float: left;
    line-height: 1;
    margin-right: 8px;
    margin-top: 4px;
    color: #1890ff;
}

.tpl-magazine .page-content h2 {
    font-size: 20px;
    font-weight: bold;
    margin-top: 22px;
    margin-bottom: 10px;
    padding-left: 10px;
    border-left: 3px solid #1890ff;
}

.tpl-magazine .page-content h3 {
    font-size: 17px;
    font-weight: bold;
    margin-top: 16px;
    margin-bottom: 8px;
    color: #1890ff;
}

.tpl-magazine .page-content blockquote {
    border-left: 4px solid #1890ff;
    background: #f8f9fa;
    padding: 12px 15px;
    margin: 12px 0;
    font-style: normal;
    color: #555;
    border-radius: 0 4px 4px 0;
}

.tpl-magazine .page-content .article-image {
    border-radius: 2px;
}

.tpl-magazine .page-footer {
    border-top: 2px solid #1890ff;
    padding-top: 8px;
    color: #1890ff;
    font-weight: bold;
}

.tpl-magazine .page-summary {
    background: #f8f9fa;
}

.tpl-magazine .page-summary .summary-title {
    color: #1890ff;
    font-size: 24px;
    font-weight: bold;
}

.tpl-magazine .page-summary .summary-text {
    color: #666;
}

.tpl-magazine .page-summary .summary-footer {
    border-top: 1px solid #ddd;
    padding-top: 15px;
    color: #999;
}

/* --- 图文混排模板 - 完整样式 --- */
.tpl-mixed {
    /* 基础结构: 图文混排 */
}

/* 封面页: 图片背景 + 底部文字叠加 */
.tpl-mixed .page-cover {
    justify-content: flex-end;
    padding: 0;
    padding-bottom: 30px;
    position: relative;
}

.tpl-mixed .page-cover .cover-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.tpl-mixed .page-cover .cover-title {
    position: relative;
    z-index: 2;
    font-size: 24px;
    font-weight: bold;
    line-height: 1.4;
    color: #fff;
    background: rgba(0, 0, 0, 0.5);
    padding: 15px 20px;
    width: 100%;
    box-sizing: border-box;
    text-align: left;
}

.tpl-mixed .page-cover .cover-subtitle {
    position: relative;
    z-index: 2;
    color: #eee;
    background: rgba(0, 0, 0, 0.3);
    padding: 8px 20px;
    width: 100%;
    box-sizing: border-box;
    text-align: left;
    margin-bottom: 0;
}

.tpl-mixed .page-cover .cover-meta {
    position: relative;
    z-index: 2;
    color: #ccc;
    padding: 5px 20px;
    background: rgba(0, 0, 0, 0.3);
    width: 100%;
    box-sizing: border-box;
    text-align: left;
}

/* 无封面图时的降级样式 */
.tpl-mixed .page-cover.no-cover-image {
    justify-content: center;
    background: #333;
}

.tpl-mixed .page-cover.no-cover-image .cover-title {
    text-align: center;
    background: none;
    font-size: 26px;
}

.tpl-mixed .page-cover.no-cover-image .cover-subtitle {
    text-align: center;
    background: none;
}

.tpl-mixed .page-cover.no-cover-image .cover-meta {
    text-align: center;
    background: none;
}

/* 内容页头部 */
.tpl-mixed .page-header {
    border-bottom: 2px solid #333;
    padding-bottom: 8px;
}

.tpl-mixed .page-header .page-title {
    font-size: 20px;
    font-weight: bold;
}

/* 内容页正文 */
.tpl-mixed .page-content {
    line-height: 1.8;
}

.tpl-mixed .page-content p {
    margin-bottom: 12px;
    text-indent: 2em;
    color: #333;
}

.tpl-mixed .page-content h2 {
    font-size: 19px;
    font-weight: bold;
    margin-top: 18px;
    margin-bottom: 8px;
    padding: 6px 12px;
    background: #f0f0f0;
    border-left: 4px solid #333;
}

.tpl-mixed .page-content h3 {
    font-size: 16px;
    font-weight: bold;
    margin-top: 14px;
    margin-bottom: 6px;
    color: #555;
}

.tpl-mixed .page-content blockquote {
    border-left: 3px solid #333;
    background: #f8f8f8;
    padding: 10px 15px;
    font-style: normal;
    color: #666;
}

.tpl-mixed .page-content .article-image {
    border-radius: 0;
    margin: 15px 0;
}

.tpl-mixed .page-content .article-image-full {
    margin: 0 -20px;
    max-width: none;
    width: 540px;
}

/* 内容页底部 */
.tpl-mixed .page-footer {
    border-top: 1px solid #333;
    color: #333;
    font-weight: bold;
}

/* 总结页 */
.tpl-mixed .page-summary {
    background: #f5f5f5;
}

.tpl-mixed .page-summary .summary-title {
    font-size: 28px;
    font-weight: bold;
    color: #333;
}

.tpl-mixed .page-summary .summary-text {
    color: #666;
}

.tpl-mixed .page-summary .summary-footer {
    color: #999;
    border-top: 1px solid #ddd;
    padding-top: 15px;
}