/* 笔记文章页共享样式 —— 沿用主站深空玻璃拟态的视觉语言 */

:root{
  --blue:#5B86FF; --aqua:#6FE3E8; --violet:#BB8CFF;
  --ink:#E8EDFB; --muted:rgba(232,237,251,.66); --dim:rgba(232,237,251,.42);
  --glass:rgba(255,255,255,.045);
  --brd:rgba(255,255,255,.1);
  --hair:rgba(255,255,255,.08);
  --serif:'Noto Serif SC',Georgia,serif;
  --sans:'Noto Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}

body{
  margin:0; padding:0 24px 96px;
  background:
    radial-gradient(1100px 560px at 50% -8%, rgba(91,134,255,.15), transparent 62%),
    radial-gradient(820px 460px at 88% 108%, rgba(187,140,255,.11), transparent 62%),
    linear-gradient(180deg,#06081A 0%,#080C22 52%,#060918 100%);
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px; line-height:1.95;
  -webkit-font-smoothing:antialiased;
}

/* ---------- 顶部返回 ---------- */
.topbar{
  position:sticky; top:0; z-index:10;
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  background:rgba(6,8,26,.72);
  border-bottom:1px solid var(--hair);
  margin:0 -24px 64px; padding:0 24px;
}
.topbar-inner{
  max-width:760px; margin:0 auto;
  display:flex; align-items:center; justify-content:space-between;
  height:62px;
}
.back{
  display:inline-flex; align-items:center; gap:8px;
  font-size:13.5px; color:var(--muted); text-decoration:none;
  transition:color .25s;
}
.back:hover{color:var(--aqua)}
.back .arrow{transition:transform .25s}
.back:hover .arrow{transform:translateX(-3px)}
.brand-mini{
  font-family:var(--serif); font-size:14px; letter-spacing:.06em;
  color:var(--dim); text-decoration:none;
}

/* ---------- 文章容器 ---------- */
.article{max-width:720px; margin:0 auto}

.article-head{margin-bottom:52px}
.cat{
  display:inline-block; margin:0 0 20px;
  font-size:12px; letter-spacing:.24em; color:var(--aqua);
  text-transform:uppercase;
}
.article-title{
  font-family:var(--serif); font-weight:700;
  font-size:38px; line-height:1.42; letter-spacing:.01em;
  margin:0 0 20px;
}
.article-meta{
  font-size:13px; color:var(--dim); letter-spacing:.04em;
  display:flex; gap:16px; flex-wrap:wrap;
  padding-top:18px; border-top:1px solid var(--hair);
}
.lede{
  font-size:17.5px; line-height:1.9; color:var(--muted);
  margin:26px 0 0; padding-left:18px;
  border-left:2px solid rgba(111,227,232,.4);
}

/* ---------- 正文 ---------- */
.body p{margin:0 0 26px}
.body h2{
  font-family:var(--serif); font-weight:600;
  font-size:23px; line-height:1.6; letter-spacing:.01em;
  margin:56px 0 22px;
}
.body h2:first-child{margin-top:0}
.body strong{font-weight:500; color:#fff}
.body em{font-style:normal; color:var(--aqua)}

.body ul,.body ol{margin:0 0 28px; padding-left:22px}
.body li{margin-bottom:12px}
.body li::marker{color:var(--aqua)}

.body blockquote{
  margin:32px 0; padding:20px 24px;
  border-radius:16px;
  background:var(--glass);
  border:1px solid var(--brd);
  color:var(--muted);
}
.body blockquote p{margin:0}
.body blockquote p+p{margin-top:12px}

/* 行内代码与数字强调 */
code{
  font-family:'Space Grotesk',ui-monospace,Consolas,monospace;
  font-size:.9em; padding:2px 7px; border-radius:6px;
  background:rgba(91,134,255,.14);
  border:1px solid rgba(91,134,255,.22);
  color:var(--aqua);
}

/* 数据块：用于放外部引用数据 */
.figures{
  margin:36px 0; padding:26px 28px; border-radius:18px;
  background:var(--glass);
  border:1px solid var(--brd);
}
.figures h3{
  font-family:var(--serif); font-size:15px; font-weight:600;
  margin:0 0 18px; color:var(--ink); letter-spacing:.02em;
}
.figures ul{margin:0; padding-left:20px; list-style:none}
.figures li{
  position:relative; margin-bottom:14px; font-size:14.5px;
  line-height:1.75; color:var(--muted); padding-left:16px;
}
.figures li:last-child{margin-bottom:0}
.figures li::before{
  content:''; position:absolute; left:0; top:.72em;
  width:6px; height:6px; border-radius:50%;
  background:linear-gradient(100deg,var(--blue),var(--aqua));
}
.figures b{color:var(--ink); font-weight:500}
.source{
  margin:16px 0 0; font-size:12.5px; color:var(--dim);
  letter-spacing:.02em;
}

/* 分隔线 */
.body hr{
  border:0; height:1px; background:var(--hair);
  margin:52px 0;
}

/* ---------- 文末 ---------- */
.article-foot{
  margin-top:64px; padding-top:28px;
  border-top:1px solid var(--hair);
  display:flex; align-items:center; justify-content:space-between;
  gap:20px; flex-wrap:wrap;
}
.signature{font-size:14px; color:var(--dim)}
.signature strong{color:var(--muted); font-weight:500}
.next-links{display:flex; gap:16px; flex-wrap:wrap}
.next-links a{
  font-size:13.5px; color:var(--muted); text-decoration:none;
  transition:color .25s;
}
.next-links a:hover{color:var(--aqua)}

/* ---------- 响应式 ---------- */
@media (max-width:640px){
  body{padding:0 20px 72px; font-size:15.5px}
  .topbar{margin:0 -20px 44px; padding:0 20px}
  .article-title{font-size:29px}
  .body h2{font-size:21px; margin:44px 0 18px}
  .lede{font-size:16px}
  .figures{padding:22px 20px}
}

/* 键盘焦点：默认 outline 在深底上不明显，改用品牌青色 */
:focus-visible{
  outline:2px solid var(--aqua);
  outline-offset:3px;
  border-radius:4px;
}

/* 尊重系统的"减少动态效果"设置 */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .back .arrow,.back:hover .arrow{transition:none; transform:none}
}