/* jinlab.com 全站共用样式（issue #33）：配色变量、顶栏、页脚、二维码弹窗、
   正文排版都只在这里定义一份，各页面 <link rel="stylesheet" href="/site.css?v=N">
   引用，页面自己的 <style> 只放该页独有的部分（比如首页的瓷砖）。
   ?v=N 是缓存破壁版本号：Cloudflare 会在边缘缓存静态文件，改了这个文件
   内容后要把所有页面里的 v= 数字一起加 1，访客才能马上拿到新版。
   只给 jinlab.com 用，不放 sites/_shared/（那里的文件会被 typeless/mind 共用）。 */

:root{
  --paper: #EAE2D0;
  --tile-bg: #F1EADC;
  --ink: #221F19;
  --ink-soft: #4B463C;
  --ink-faint: #948C77;
  --rule: rgba(34,31,25,0.14);
  --mark: #C9552B;
  --mark-wash: rgba(201,85,43,0.08);
  color-scheme: light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper: #17140E;
    --tile-bg: #211D16;
    --ink: #F1E9D9;
    --ink-soft: #BDB4A0;
    --ink-faint: #6E6656;
    --rule: rgba(241,233,217,0.14);
    --mark: #E3824F;
    --mark-wash: rgba(227,130,79,0.1);
    color-scheme: dark;
  }
}
:root[data-theme="dark"]{
  --paper: #17140E;
  --tile-bg: #211D16;
  --ink: #F1E9D9;
  --ink-soft: #BDB4A0;
  --ink-faint: #6E6656;
  --rule: rgba(241,233,217,0.14);
  --mark: #E3824F;
  --mark-wash: rgba(227,130,79,0.1);
  color-scheme: dark;
}

*{ box-sizing: border-box; }
html, body{ min-height: 100%; }
body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Sans 3", "Noto Sans SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- 顶栏：左边品牌（点了回首页），右边站内导航 + 主题切换 ---------- */
.topbar{
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  row-gap: 12px;
  padding: 22px 28px;
  border-bottom: 1px solid var(--rule);
}
.topbar-home{
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.topbar-logo{ height: 24px; width: auto; display: block; }
.topbar-brand{
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}
.topbar-right{
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}
.topbar-link{
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
}
.topbar-link:hover, .topbar-link:focus-visible, .topbar-link[aria-current="page"]{ color: var(--mark); }
.theme-toggle{
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 8px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle svg{ width: 16px; height: 16px; display: block; }
.theme-toggle:hover,
.theme-toggle:focus-visible{ color: var(--mark); border-color: var(--mark); }
.theme-toggle:focus-visible{ outline: 2px solid var(--mark); outline-offset: 2px; }
.theme-toggle .icon-sun{ display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon{ display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun{ display: block; }
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .theme-toggle .icon-moon{ display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-sun{ display: block; }
}
@media (prefers-reduced-motion: reduce){ .theme-toggle{ transition: none; } }

/* ---------- 页脚：左边版权 + 站内链接，右边关注图标 ---------- */
footer{
  border-top: 1px solid var(--rule);
  padding: 20px 28px 26px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.footer-main{ min-width: 0; }
footer .copyright{
  margin: 0;
  text-align: left;
  font-size: 0.82rem;
  color: var(--ink-faint);
  line-height: 1.6;
}
footer .years{
  font-family: "IBM Plex Mono", monospace;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
}
footer .copyright strong{ color: var(--ink-soft); font-weight: 600; }
.footer-links{
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-top: 6px;
}
.footer-links a{
  font-size: 0.8rem;
  color: var(--ink-soft);
  text-decoration: none;
}
.footer-links a:hover, .footer-links a:focus-visible{ color: var(--mark); text-decoration: underline; text-underline-offset: 2px; }
.footer-follow{
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
  flex-shrink: 0;
}
.follow-icon-btn{
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 0;
  padding: 4px;
  cursor: pointer;
  color: var(--ink-faint);
  text-decoration: none;
  transition: color 0.15s ease, opacity 0.15s ease, filter 0.15s ease;
}
.follow-icon-btn svg,
.follow-icon-btn img{ width: 20px; height: 20px; display: block; }
/* 单色图标靠 color 变亮；微信这类官方彩色图标没法用 currentColor，
   改用 opacity+filter，同样是"悬停变亮"的效果。 */
.follow-icon-btn:hover,
.follow-icon-btn:focus-visible{ color: var(--mark); }
.follow-icon-btn .brand-icon{ opacity: 0.85; }
.follow-icon-btn:hover .brand-icon,
.follow-icon-btn:focus-visible .brand-icon{ opacity: 1; filter: brightness(1.08); }
.follow-icon-btn:focus-visible{ outline: 2px solid var(--mark); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce){ .follow-icon-btn{ transition: none; } }

/* ---------- 二维码弹窗：暗色主题下也固定浅色卡片，二维码需要浅色留白才扫得出 ---------- */
.qr-modal{
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.qr-modal[hidden]{ display: none; }
.qr-modal-backdrop{ position: absolute; inset: 0; background: rgba(0,0,0,0.55); }
.qr-modal-card{
  position: relative;
  background: #FBF6EA;
  border-radius: 14px;
  padding: 28px 28px 22px;
  width: 260px;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}
.qr-modal-card img{ width: 200px; height: 200px; object-fit: contain; display: block; }
.qr-modal-label{
  font-family: "Fraunces", "Noto Serif SC", serif;
  font-weight: 600;
  font-size: 1rem;
  color: #221F19;
  text-align: center;
  margin: 0;
}
.qr-modal-label small{
  display: block;
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-weight: 400;
  font-size: 0.78rem;
  color: #4B463C;
  margin-top: 2px;
}
.qr-modal-close{
  position: absolute;
  top: 8px;
  right: 10px;
  background: none;
  border: 0;
  font-size: 1.3rem;
  line-height: 1;
  color: #4B463C;
  cursor: pointer;
  padding: 6px;
}
.qr-modal-close:focus-visible{ outline: 2px solid var(--mark); outline-offset: 2px; }

/* ---------- 正文页（文章、关于、隐私、AI学习）共用排版 ---------- */
.page{
  flex: 1;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 28px 64px;
}
.page-eyebrow{
  font-family: "IBM Plex Mono", monospace;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.7rem;
  color: var(--ink-faint);
  margin: 0 0 12px;
}
.page-eyebrow a{ color: inherit; text-decoration: none; }
.page-eyebrow a:hover, .page-eyebrow a:focus-visible{ color: var(--mark); }
.page h1{
  font-family: "Fraunces", "Noto Serif SC", serif;
  font-weight: 900;
  font-size: clamp(1.6rem, 2.6vw + 1rem, 2.3rem);
  line-height: 1.3;
  margin: 0 0 14px;
}
.page-meta{
  font-size: 0.84rem;
  color: var(--ink-faint);
  margin: 0 0 28px;
}
.lede{
  font-size: 1.06rem;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 28px;
}
.prose{ font-size: 1rem; line-height: 1.85; color: var(--ink); overflow-wrap: break-word; }
.prose h2{
  font-family: "Fraunces", "Noto Serif SC", serif;
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.4;
  margin: 40px 0 12px;
}
.prose h3{ font-size: 1.05rem; font-weight: 600; margin: 28px 0 8px; }
.prose p{ margin: 0 0 16px; }
.prose ul, .prose ol{ margin: 0 0 16px; padding-left: 1.4em; }
.prose li{ margin: 0 0 6px; }
.prose a{ color: var(--mark); text-decoration: underline; text-underline-offset: 2px; }
.prose a:hover, .prose a:focus-visible{ color: var(--ink); }
.prose strong{ font-weight: 600; }
.prose code{
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.86em;
  background: var(--mark-wash);
  padding: 1px 5px;
  border-radius: 4px;
}
.prose .callout{
  border-left: 3px solid var(--mark);
  background: var(--mark-wash);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 0 0 20px;
}
.prose .callout p:last-child{ margin-bottom: 0; }
.table-wrap{ overflow-x: auto; margin: 0 0 20px; }
.prose table{ border-collapse: collapse; width: 100%; font-size: 0.9rem; }
.prose th, .prose td{ border-bottom: 1px solid var(--rule); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th{ font-weight: 600; color: var(--ink-soft); }
.article-end{
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* 文章列表（首页「原创文章」区和 /articles/ 共用） */
.article-list{ list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.article-card{
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: 16px;
  background: var(--tile-bg);
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.article-card:hover, .article-card:focus-visible{ transform: translateY(-2px); border-color: var(--mark); }
.article-card:focus-visible{ outline: 2px solid var(--mark); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce){ .article-card{ transition: none; } }
.article-card-title{ display: block; font-weight: 600; font-size: 1rem; line-height: 1.5; color: var(--ink); margin: 0 0 6px; }
.article-card-summary{ display: block; font-size: 0.88rem; line-height: 1.7; color: var(--ink-soft); }

@media (max-width: 480px){
  .topbar{ padding: 18px 18px; }
  .page{ padding: 36px 18px 48px; }
  footer{ flex-wrap: wrap; padding: 18px 18px 22px; }
  .footer-follow{ margin-left: 0; }
  .qr-modal-card{ width: 220px; padding: 24px 20px 18px; }
  .qr-modal-card img{ width: 172px; height: 172px; }
}