/*
Theme Name: InsightYouth 有悟青年
Theme URI:  https://www.insightyouth.cn
Description: 为「有悟青年 InsightYouth」定制的文章主题。沿用官网的墨绿设计系统，针对深度长文做了专门的排版优化：720px 舒适行宽、17px 正文、自动目录、阅读进度条。并内置 canonical、JSON-LD 结构化数据与 OG 标签，为搜索长尾流量服务。
Author:     InsightYouth
Author URI: https://www.insightyouth.cn
Version:    1.0.0
*/

/* ==========================================================================
   1. 设计变量 —— 与官网 index.html 完全对齐
   ========================================================================== */
:root{
  --bg:#f4faf6;
  --card:#ffffff;
  --text:#1b2e26;
  --muted:#6b8079;
  --primary:#1f7a5c;
  --primary-deep:#14523e;
  --primary-soft:#e6f4ed;
  --accent:#3fa87a;
  --border:#dcebe3;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 4px 20px rgba(20,82,62,.07);
  --shadow-hover:0 8px 28px rgba(20,82,62,.12);

  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  /* 正文行宽：一行约 35~40 个汉字，视线不必左右大幅度扫动 */
  --read-width:720px;
  --wide-width:1080px;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

a{color:var(--primary);text-decoration:none;transition:color .18s}
a:hover{color:var(--primary-deep)}

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

/* ==========================================================================
   2. 顶部导航 —— 精简版官网导航，读者随时能走回主站
   ========================================================================== */
.iy-nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
}
.iy-nav-inner{
  max-width:var(--wide-width);margin:0 auto;
  padding:0 24px;height:60px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.iy-logo{
  font-size:17px;font-weight:700;color:var(--primary-deep);
  letter-spacing:.3px;white-space:nowrap;
}
/* 副标与官网一致：继承 logo 的字号字重，仅换主题色 */
.iy-logo span{color:var(--primary)}
.iy-nav-links{display:flex;align-items:center;gap:26px;flex:0 1 auto}
.iy-nav-links a{
  font-size:15px;font-weight:400;letter-spacing:.2px;color:var(--muted);
  position:relative;padding:4px 0;white-space:nowrap;
}
.iy-nav-links a:hover{color:var(--primary)}
.iy-nav-links a.is-current{color:var(--primary);font-weight:600}
.iy-nav-links a.is-current::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;
  height:2px;border-radius:2px;background:var(--primary);
}

/* 阅读进度条 */
.iy-progress{
  position:absolute;left:0;bottom:-1px;height:2px;width:0;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  transition:width .1s linear;
}

/* ==========================================================================
   3. 布局骨架
   ========================================================================== */
.iy-main{
  max-width:var(--read-width);
  margin:0 auto;padding:44px 24px 60px;
}
.iy-main--wide{max-width:var(--wide-width)}

.iy-layout{
  display:grid;grid-template-columns:minmax(0,1fr) 280px;
  gap:36px;align-items:start;
}

.iy-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

/* ==========================================================================
   4. 首页 / 列表页：文章卡片
   ========================================================================== */
.iy-page-head{margin-bottom:28px}
.iy-page-head h1{
  margin:0 0 8px;font-size:26px;font-weight:700;color:var(--text);
  letter-spacing:-.3px;
}
.iy-page-head p{margin:0;font-size:14px;color:var(--muted)}

.iy-post-list{display:flex;flex-direction:column;gap:18px}

.iy-post-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:24px 26px;
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.iy-post-card:hover{
  transform:translateY(-2px);
  box-shadow:var(--shadow-hover);
  border-color:var(--accent);
}
.iy-post-card h2{
  margin:0 0 10px;font-size:19px;font-weight:700;line-height:1.45;
  letter-spacing:-.2px;
}
.iy-post-card h2 a{color:var(--text)}
.iy-post-card h2 a:hover{color:var(--primary)}
.iy-post-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-size:13px;color:var(--muted);margin-bottom:12px;
}
.iy-post-meta .iy-dot{opacity:.5}
.iy-tag{
  display:inline-block;background:var(--primary-soft);color:var(--primary-deep);
  font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;
}
.iy-post-excerpt{
  margin:0;font-size:14.5px;line-height:1.75;color:var(--muted);
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;
  overflow:hidden;
}
.iy-post-more{
  display:inline-block;margin-top:14px;font-size:14px;font-weight:600;
}

/* 分页 */
.iy-pager{
  display:flex;justify-content:space-between;align-items:center;
  margin-top:32px;padding-top:22px;border-top:1px solid var(--border);
  font-size:14px;color:var(--muted);
}

/* 独立页面入口：挂在文章列表底部，胶囊按钮组 */
.iy-page-links{
  display:flex;flex-wrap:wrap;gap:10px;
  margin-top:24px;padding-top:20px;border-top:1px dashed var(--border);
}
.iy-page-link{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 16px;border:1px solid var(--border);border-radius:999px;
  background:var(--card);color:var(--text);
  font-size:14px;font-weight:500;text-decoration:none;
  transition:all .18s;
}
.iy-page-link:hover{
  color:var(--primary);border-color:var(--primary);
  background:var(--primary-soft);transform:translateY(-1px);
}
.iy-page-arrow{opacity:.55;transition:transform .18s}
.iy-page-link:hover .iy-page-arrow{opacity:1;transform:translateX(2px)}

/* ==========================================================================
   5. 文章详情页
   ========================================================================== */
.iy-article-head{margin-bottom:34px}
.iy-article-head h1{
  margin:0 0 14px;font-size:31px;font-weight:700;line-height:1.35;
  letter-spacing:-.5px;color:var(--text);
}
.iy-article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px;
  font-size:13.5px;color:var(--muted);
}
.iy-article-meta .iy-dot{opacity:.5}
.iy-article-meta a{border-bottom:1px solid transparent}
.iy-article-meta a:hover{border-bottom-color:currentColor}
.iy-article-cover{
  margin:0 0 30px;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);
}
.iy-article-cover img{width:100%}

/* --- 正文排版：这是本主题最花心思的地方 --- */
.iy-content{
  font-size:17px;line-height:1.85;color:var(--text);
  word-wrap:break-word;overflow-wrap:break-word;
}
.iy-content p{margin:0 0 1.4em}
.iy-content p:last-child{margin-bottom:0}

.iy-content h2,.iy-content h3,.iy-content h4{
  color:var(--text);font-weight:700;letter-spacing:-.2px;
  scroll-margin-top:80px;   /* 锚点跳转时避免被吸顶导航盖住 */
}
.iy-content h2{
  font-size:22px;line-height:1.5;margin:2.2em 0 .9em;
  padding-left:14px;border-left:4px solid var(--primary);
}
.iy-content h3{font-size:18px;line-height:1.5;margin:1.9em 0 .8em}
.iy-content h4{font-size:16px;margin:1.6em 0 .7em}

.iy-content a{
  color:var(--primary);border-bottom:1px solid var(--border);
  transition:border-color .18s;
}
.iy-content a:hover{border-bottom-color:var(--primary)}

.iy-content strong{font-weight:700;color:var(--primary-deep)}
.iy-content em{font-style:normal;color:var(--muted)}

/* 列表 */
.iy-content ul,.iy-content ol{margin:0 0 1.4em;padding-left:1.5em}
.iy-content li{margin:0 0 .5em}
.iy-content li::marker{color:var(--primary)}
.iy-content ul ul,.iy-content ol ol,.iy-content ul ol,.iy-content ol ul{
  margin:.5em 0 0;
}

/* 引用 */
.iy-content blockquote{
  margin:1.8em 0;padding:14px 20px;
  border-left:3px solid var(--primary);
  background:var(--primary-soft);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  color:var(--primary-deep);
}
.iy-content blockquote p{margin:0}
.iy-content blockquote p + p{margin-top:.7em}

/* 分割线 */
.iy-content hr{
  margin:2.4em auto;border:none;height:1px;
  background:linear-gradient(90deg,transparent,var(--border) 15%,var(--border) 85%,transparent);
}

/* 图片 */
.iy-content img{
  border-radius:var(--radius-sm);
  margin:1.8em auto;
  box-shadow:0 2px 12px rgba(20,82,62,.08);
}
.iy-content p > img:only-child{margin:1.6em auto}

/* 代码块 */
.iy-content code{
  font-family:var(--font-mono);font-size:.88em;
  background:var(--primary-soft);color:var(--primary-deep);
  padding:2px 6px;border-radius:5px;
}
.iy-content pre{
  margin:1.8em 0;padding:18px 20px;overflow-x:auto;
  background:#16342a;color:#d7ece2;
  border-radius:var(--radius-sm);
  font-size:14px;line-height:1.7;
}
.iy-content pre code{
  background:none;color:inherit;padding:0;font-size:1em;
  font-family:var(--font-mono);
}

/* 表格 */
.iy-content table{
  width:100%;margin:1.8em 0;border-collapse:collapse;
  font-size:15px;display:block;overflow-x:auto;
}
.iy-content thead{background:var(--primary-soft)}
.iy-content th{
  padding:11px 14px;text-align:left;font-weight:600;
  color:var(--primary-deep);border-bottom:2px solid var(--border);
  white-space:nowrap;
}
.iy-content td{
  padding:11px 14px;border-bottom:1px solid var(--border);
}
.iy-content tbody tr:nth-child(even){background:rgba(230,244,237,.4)}
.iy-content tbody tr:hover{background:var(--primary-soft)}

/* 文末 */
.iy-article-foot{
  margin-top:52px;padding-top:26px;border-top:1px solid var(--border);
}
.iy-article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.iy-article-tags a{
  background:var(--primary-soft);color:var(--primary-deep);
  font-size:13px;padding:4px 12px;border-radius:999px;
}
.iy-article-tags a:hover{background:var(--primary);color:#fff}
/* 上下篇 */
.iy-neighbor{
  display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px;
}
.iy-nb-item{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:14px 16px;
  font-size:14px;color:var(--text);line-height:1.6;
  transition:border-color .18s,transform .18s;
  overflow:hidden;
}
.iy-nb-item:hover{border-color:var(--primary);transform:translateY(-1px)}
.iy-nb-item a{
  display:block;color:var(--text);border:none;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.iy-nb-item a:hover{color:var(--primary)}
.iy-nb-label{
  display:block;font-size:12px;color:var(--muted);margin-bottom:5px;
}
.iy-nb-next{text-align:right}

/* ==========================================================================
   6. 侧边栏
   ========================================================================== */
.iy-sidebar{display:flex;flex-direction:column;gap:18px;position:sticky;top:80px}
.iy-widget{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);
}
.iy-widget h3{
  margin:0 0 14px;font-size:14px;font-weight:700;color:var(--primary-deep);
  padding-bottom:10px;border-bottom:1px solid var(--border);
}
.iy-widget ul{list-style:none;margin:0;padding:0}
.iy-widget li{
  padding:7px 0;font-size:14px;color:var(--muted);
  border-bottom:1px dashed rgba(220,235,227,.7);
}
.iy-widget li:last-child{border-bottom:none}
.iy-widget li a{color:var(--text)}
.iy-widget li a:hover{color:var(--primary)}
.iy-widget .iy-count{
  float:right;font-size:12px;color:var(--muted);
  background:var(--primary-soft);padding:1px 8px;border-radius:999px;
}

/* ==========================================================================
   7. 浮动目录（TOC）—— 长文利器
   ========================================================================== */
.iy-toc{
  position:fixed;top:120px;left:calc(50% + 390px);
  width:190px;max-height:calc(100vh - 200px);overflow-y:auto;
  font-size:13px;line-height:1.6;
  opacity:0;transition:opacity .25s;pointer-events:none;
}
.iy-toc.is-visible{opacity:1;pointer-events:auto}
.iy-toc-title{
  font-size:12px;font-weight:700;color:var(--muted);
  margin-bottom:10px;letter-spacing:.5px;
}
.iy-toc a{
  display:block;padding:4px 0 4px 12px;
  color:var(--muted);border-left:2px solid var(--border);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.iy-toc a:hover{color:var(--primary);border-left-color:var(--primary)}
.iy-toc a.is-active{
  color:var(--primary);border-left-color:var(--primary);font-weight:600;
}
.iy-toc a.iy-toc-h3{padding-left:24px;font-size:12.5px}

/* ==========================================================================
   8. 页脚
   ========================================================================== */
.iy-footer{
  margin-top:60px;padding:26px 0;
  border-top:1px solid var(--border);
  background:rgba(230,244,237,.35);
}
.iy-footer-inner{
  max-width:var(--wide-width);margin:0 auto;padding:0 24px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px;font-size:13px;color:var(--muted);
}
.iy-footer a{color:var(--primary)}

/* ==========================================================================
   9. 404
   ========================================================================== */
.iy-404{text-align:center;padding:60px 0}
.iy-404 h1{font-size:64px;margin:0 0 8px;color:var(--primary-soft);font-weight:800}
.iy-404 p{margin:0 0 26px;color:var(--muted)}

/* ==========================================================================
   10. 响应式
   ========================================================================== */
@media (max-width:1280px){
  .iy-toc{display:none}
}
@media (max-width:900px){
  .iy-layout{grid-template-columns:minmax(0,1fr)}
  .iy-sidebar{position:static}
  /* 导航项较多时（含独立页面），窄屏改为横向滑动，避免挤爆或被隐藏 */
  .iy-nav-links{
    min-width:0;overflow-x:auto;
    overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;
    scrollbar-width:none;-ms-overflow-style:none;
  }
  .iy-nav-links::-webkit-scrollbar{display:none}
  .iy-logo{flex:0 0 auto}
}
@media (max-width:640px){
  body{font-size:15px}
  .iy-nav-inner{padding:0 16px;height:54px}
  .iy-nav-links{gap:14px}
  .iy-nav-links a{font-size:13px}
  .iy-logo span{display:none}

  .iy-main{padding:26px 16px 40px}
  .iy-article-head h1{font-size:24px}
  .iy-content{font-size:16px;line-height:1.8}
  .iy-content h2{font-size:19px;margin:1.8em 0 .8em}
  .iy-content h3{font-size:17px}
  .iy-post-card{padding:18px 18px}
  .iy-post-card h2{font-size:17px}
  .iy-neighbor{grid-template-columns:1fr}
  .iy-neighbor .iy-nb-next{text-align:left}
  .iy-404 h1{font-size:48px}

  .iy-about{flex-direction:column;text-align:center;padding:20px 18px;gap:14px}
  .iy-about-qr{width:120px;height:120px}
  .iy-about-body{text-align:center}
}

/* ---------- 页脚「数据统计」图标：与官网首页 .stat-link 完全一致 ---------- */
.iy-footer a.iy-stat-link{
  display:inline-flex;align-items:center;gap:5px;
  margin-left:10px;vertical-align:middle;
  font-size:12px;color:var(--muted);text-decoration:none;
  padding:4px 10px;border:1px solid var(--border);border-radius:20px;
  background:var(--bg);transition:all .16s;opacity:.75;
}
.iy-footer a.iy-stat-link:hover{
  opacity:1;color:var(--primary);
  border-color:var(--primary);background:var(--primary-soft);
}

/* ---------- 文末「关于本文」卡片：版权信息 + 公众号二维码 ---------- */
.iy-about{
  display:flex;align-items:center;gap:18px;
  margin-top:22px;padding:18px 20px;
  background:var(--primary-soft);
  border-radius:var(--radius);
}
.iy-about-qr{
  flex:none;width:96px;height:96px;
  border-radius:10px;background:#fff;
  border:1px solid var(--border);
  display:block;
}
.iy-about-body{min-width:0;font-size:13.5px;color:var(--primary-deep);line-height:1.75}
.iy-about-body strong{display:block;margin-bottom:4px;font-size:14px}
.iy-about-body p{margin:0}
.iy-about-wx{margin-top:6px !important;opacity:.85}

/* 打印：去掉导航与目录，专注正文 */
@media print{
  .iy-nav,.iy-toc,.iy-sidebar,.iy-footer,.iy-neighbor,.iy-about{display:none}
  body{background:#fff}
  .iy-content{font-size:12pt}
}