/* blog/blog.css — shared by the blog index and every post.
   Design tokens are copied verbatim from site/index.html so the blog reads as
   the same product, not a bolted-on sub-site. */

:root{
  --bg:#05070d; --bg2:#080c15; --panel:rgba(15,22,36,.66); --line:rgba(94,140,190,.18);
  --txt:#dbe6f3; --dim:#7f93ac; --dim2:#5d7089;
  --cyan:#38e1ff; --blue:#3d7dff; --ice:#9fe8ff;
  --violet:#8b5cf6; --amber:#ffb545; --rose:#ff5d7a; --green:#39d98a;
  --grad:linear-gradient(135deg,#38e1ff 0%,#3d7dff 55%,#8b5cf6 100%);
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --max:860px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--txt);
  font-family:var(--sans); font-size:16px; line-height:1.75;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(900px 520px at 12% -8%, rgba(56,225,255,.10), transparent 62%),
    radial-gradient(760px 460px at 88% 4%, rgba(139,92,246,.10), transparent 60%);
  background-repeat:no-repeat;
}
a{color:var(--ice); text-decoration:none}
a:hover{color:var(--cyan)}
::selection{background:rgba(56,225,255,.26); color:#fff}

/* ---------------------------------------------------------------- top bar */
.bar{
  position:sticky; top:0; z-index:50;
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  background:rgba(5,7,13,.82); border-bottom:1px solid var(--line);
}
.bar-in{
  max-width:var(--max); margin:0 auto; padding:11px 22px;
  display:flex; align-items:center; gap:16px;
}
.bar a.brand{
  font-family:var(--mono); font-size:13px; letter-spacing:.04em;
  color:var(--txt); display:flex; align-items:center; gap:8px; white-space:nowrap;
}
.bar a.brand b{
  background:var(--grad); -webkit-background-clip:text; background-clip:text;
  color:transparent; font-weight:800; font-size:15px;
}
.bar .sp{flex:1}
.bar .lang{
  display:flex; gap:2px; border:1px solid var(--line); border-radius:9px; padding:2px;
  background:rgba(9,14,24,.7);
}
.bar .lang button{
  font:inherit; font-size:12px; font-family:var(--mono);
  padding:3px 10px; border:0; border-radius:7px; cursor:pointer;
  background:transparent; color:var(--dim); transition:.16s;
}
.bar .lang button.on{background:rgba(56,225,255,.14); color:var(--cyan)}
.bar .lang a.lang-link{
  font-size:12px; font-family:var(--mono); padding:3px 10px; border-radius:7px;
  color:var(--dim); text-decoration:none; transition:.16s;
}
.bar .lang a.lang-link:hover{background:rgba(56,225,255,.14); color:var(--cyan)}
.bar .back{font-size:13px; color:var(--dim); font-family:var(--mono)}
.bar .back:hover{color:var(--cyan)}

/* reading progress */
#pg{
  position:fixed; top:0; left:0; height:2px; width:0;
  background:var(--grad); z-index:60; transition:width .1s linear;
}

/* ------------------------------------------------------------------ shell */
.wrap{max-width:var(--max); margin:0 auto; padding:0 22px}

/* ------------------------------------------------------------------- hero */
.hero{padding:64px 0 34px}
.eyebrow{
  display:inline-flex; align-items:center; gap:9px;
  font-family:var(--mono); font-size:12px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--dim);
}
.eyebrow .dot{
  width:6px; height:6px; border-radius:50%; background:var(--cyan);
  box-shadow:0 0 12px var(--cyan);
}
h1{
  font-size:clamp(30px,4.6vw,46px); line-height:1.18; margin:16px 0 0;
  letter-spacing:-.02em; font-weight:800;
}
h1 .grad{background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent}
.lede{color:var(--dim); font-size:17px; margin:16px 0 0; max-width:70ch}
.meta{
  margin-top:22px; display:flex; flex-wrap:wrap; gap:10px 18px;
  font-family:var(--mono); font-size:12px; color:var(--dim2);
}
.meta span{display:inline-flex; align-items:center; gap:6px}

/* ------------------------------------------------------------------- card */
.card{
  display:block; padding:25px 26px; border:1px solid var(--line); border-radius:16px;
  background:var(--panel); position:relative; overflow:hidden;
  transition:transform .18s, border-color .18s, box-shadow .18s;
}
.card::before{
  content:""; position:absolute; inset:0; border-radius:16px; pointer-events:none;
  background:var(--grad); opacity:0; transition:opacity .18s;
  -webkit-mask:linear-gradient(#000,#000) content-box,linear-gradient(#000,#000);
  -webkit-mask-composite:xor; mask-composite:exclude; padding:1px;
}
.card:hover{transform:translateY(-2px); border-color:rgba(56,225,255,.34); box-shadow:0 16px 40px -22px rgba(56,225,255,.5)}
.card:hover::before{opacity:.9}
.card h2{font-size:20px; margin:0 0 8px; line-height:1.35; color:var(--txt)}
.card p{margin:0; color:var(--dim); font-size:14.5px}
.tags{display:flex; flex-wrap:wrap; gap:7px; margin-top:15px}
.tag{
  font-family:var(--mono); font-size:11px; letter-spacing:.03em;
  padding:3px 9px; border-radius:20px; border:1px solid var(--line);
  color:var(--dim); background:rgba(56,225,255,.05);
}

/* -------------------------------------------------------------- post body */
article{padding-bottom:40px}
article h2{
  font-size:26px; margin:52px 0 14px; line-height:1.3; font-weight:750;
  padding-top:14px; border-top:1px solid var(--line);
}
article h2::before{
  content:attr(data-n); font-family:var(--mono); font-size:12px;
  color:var(--cyan); display:block; margin-bottom:7px; letter-spacing:.1em;
}
article h3{font-size:19px; margin:32px 0 10px; color:var(--ice); font-weight:650}
article p{margin:0 0 17px; color:#c6d4e6}
article ul,article ol{margin:0 0 18px; padding-left:22px; color:#c6d4e6}
article li{margin:7px 0}
article li::marker{color:var(--cyan)}
article strong{color:#eaf3ff; font-weight:650}
article code{
  font-family:var(--mono); font-size:.875em;
  background:rgba(56,225,255,.09); border:1px solid rgba(56,225,255,.15);
  padding:1.5px 5px; border-radius:5px; color:var(--ice); word-break:break-word;
}
article a{text-decoration:underline; text-underline-offset:3px; text-decoration-color:rgba(56,225,255,.35)}
article a:hover{text-decoration-color:var(--cyan)}

/* code blocks */
pre{
  margin:0 0 22px; padding:17px 19px; overflow-x:auto;
  background:#070b14; border:1px solid var(--line); border-radius:12px;
  font-family:var(--mono); font-size:13px; line-height:1.65; color:#c9d7e8;
  position:relative;
}
pre code{background:none; border:0; padding:0; font-size:inherit; color:inherit}
pre .c1{color:#5d7089; font-style:italic}      /* comment */
pre .s1{color:#39d98a}                          /* string */
pre .k1{color:#8b5cf6; font-weight:600}         /* keyword */
pre .n1{color:#ffb545}                          /* number / flag */
pre .f1{color:#38e1ff}                          /* function / command */
pre .e1{color:#ff5d7a}                          /* error / removed */
pre .g1{color:#39d98a}                          /* added / ok */

/* callouts */
.note{
  margin:0 0 22px; padding:15px 18px 15px 17px; border-radius:12px;
  border:1px solid var(--line); border-left:3px solid var(--cyan);
  background:rgba(56,225,255,.055); font-size:14.5px; color:#c6d4e6;
}
.note.warn{border-left-color:var(--amber); background:rgba(255,181,69,.06)}
.note.bug{border-left-color:var(--rose); background:rgba(255,93,122,.06)}
.note.ok{border-left-color:var(--green); background:rgba(57,217,138,.06)}
.note b{color:#eaf3ff}
.note-title{
  font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--cyan); display:block; margin-bottom:6px;
}
.note.warn .note-title{color:var(--amber)}
.note.bug .note-title{color:var(--rose)}
.note.ok .note-title{color:var(--green)}
.note p:last-child{margin-bottom:0}

/* tables */
.tw{overflow-x:auto; margin:0 0 22px; border:1px solid var(--line); border-radius:12px}
table{border-collapse:collapse; width:100%; font-size:14px; min-width:420px}
th,td{padding:10px 14px; text-align:left; border-bottom:1px solid var(--line)}
th{
  background:rgba(56,225,255,.06); color:var(--ice);
  font-family:var(--mono); font-size:11.5px; letter-spacing:.06em;
  text-transform:uppercase; font-weight:600; white-space:nowrap;
}
tr:last-child td{border-bottom:0}
td code{font-size:.86em}
.num{font-family:var(--mono); text-align:right; white-space:nowrap}

/* figures */
figure{margin:26px 0; padding:0}
.fig-box{
  border:1px solid var(--line); border-radius:14px; overflow:hidden;
  background:linear-gradient(180deg,#080d17,#060911);
}
.fig-box svg{display:block; width:100%; height:auto}
.fig-box img{display:block; width:100%; height:auto}
figcaption{
  margin-top:10px; font-size:12.5px; color:var(--dim2); font-family:var(--mono);
  text-align:center; letter-spacing:.02em;
}

/* stats strip */
.stats{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(128px,1fr));
  gap:1px; margin:0 0 24px; background:var(--line);
  border:1px solid var(--line); border-radius:13px; overflow:hidden;
}
.stat{background:#070b14; padding:15px 16px}
.stat b{
  display:block; font-family:var(--mono); font-size:23px; line-height:1.15;
  background:var(--grad); -webkit-background-clip:text; background-clip:text;
  color:transparent; font-weight:800;
}
.stat span{font-size:11.5px; color:var(--dim); letter-spacing:.02em}

/* footer / cta */
.cta{
  margin:48px 0 0; padding:26px; border-radius:16px; border:1px solid var(--line);
  background:linear-gradient(135deg,rgba(56,225,255,.07),rgba(139,92,246,.07));
}
.cta h3{margin:0 0 8px; font-size:18px; color:#eaf3ff}
.cta p{margin:0 0 16px; color:var(--dim); font-size:14.5px}
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 20px; border-radius:10px; font-size:14px; font-weight:600;
  font-family:var(--sans); border:1px solid transparent; cursor:pointer;
  transition:.18s;
}
.btn-p{background:var(--grad); color:#04070e}
.btn-p:hover{filter:brightness(1.12); color:#04070e; transform:translateY(-1px)}
.btn-g{
  border-color:var(--line); color:var(--ice); background:rgba(56,225,255,.05);
}
.btn-g:hover{border-color:rgba(56,225,255,.45); color:var(--cyan)}

.foot{
  border-top:1px solid var(--line); margin-top:56px; padding:26px 0 46px;
  font-family:var(--mono); font-size:12px; color:var(--dim2);
  display:flex; flex-wrap:wrap; gap:10px 20px; align-items:center;
}
.foot .sp{flex:1}

/* TOC */
.toc{
  margin:0 0 34px; padding:18px 22px; border:1px solid var(--line);
  border-radius:13px; background:rgba(9,14,24,.6);
}
.toc-t{
  font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--dim2); margin-bottom:10px;
}
.toc ol{margin:0; padding-left:20px; font-size:14px}
.toc li{margin:5px 0}
.toc a{color:var(--dim); text-decoration:none}
.toc a:hover{color:var(--cyan)}

/* reveal */
.reveal{opacity:0; transform:translateY(14px); transition:opacity .5s ease, transform .5s ease}
.reveal.on{opacity:1; transform:none}

@media (max-width:640px){
  .hero{padding:40px 0 24px}
  article h2{font-size:22px; margin-top:40px}
  .card{padding:20px}
  .bar-in{padding:9px 16px; gap:10px}
  .bar a.brand{font-size:12px}
  pre{font-size:12px; padding:14px}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1; transform:none; transition:none}
  html{scroll-behavior:auto}
}

/* ---------- author card ---------- */
/* Added for GEO: the audit scored Expertise 9/13 because neither post ever
   stated who wrote it. An AI reading the page can judge the writing; it cannot
   verify the author without an explicit block. Kept visually quiet so it does
   not compete with the article. */
.author{
  display:flex; gap:16px; align-items:flex-start;
  margin:44px 0 0; padding:18px 20px; border-radius:12px;
  border:1px solid var(--line); background:rgba(9,14,24,.55);
}
.author .av{
  flex:0 0 46px; width:46px; height:46px; border-radius:50%;
  background:var(--grad); color:#04121a; font-weight:700; font-size:18px;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); letter-spacing:0;
}
.author .who{flex:1; min-width:0}
.author .nm{font-weight:600; color:#eaf3ff; font-size:14.5px; margin-bottom:3px}
.author .rl{font-family:var(--mono); font-size:11.5px; color:var(--dim2); letter-spacing:.05em; margin-bottom:8px}
.author .bio{font-size:13.5px; line-height:1.65; color:var(--dim); margin:0 0 8px}
.author .lk{display:flex; flex-wrap:wrap; gap:14px; font-family:var(--mono); font-size:12px}
.author .lk a{color:var(--cyan); text-decoration:none}
.author .lk a:hover{text-decoration:underline}
@media(max-width:520px){
  .author{flex-direction:column; gap:12px}
  .author .av{flex:0 0 auto}
}

/* ---------- FAQ ---------- */
.faq{margin:8px 0 0}
.faq .q{
  font-weight:600; color:#eaf3ff; font-size:15px;
  margin:18px 0 6px; padding-left:14px; position:relative;
}
.faq .q::before{
  content:"Q"; position:absolute; left:0; top:1px;
  font-family:var(--mono); font-size:11px; color:var(--cyan);
}
.faq .a{
  margin:0 0 4px 14px; font-size:14.5px; line-height:1.7; color:var(--dim);
}

/* ---------- related notes ---------- */
/* Internal links between the four notes: a crawler that sees only one page
   cannot tell these are one body of work. Kept quieter than a section heading
   because it sits below the article, not inside the argument. */
.related{
  margin:34px 0 4px; padding:16px 18px; border:1px solid var(--line);
  border-radius:12px; background:var(--panel);
}
.related-t{
  margin:0 0 8px; font-family:var(--mono); font-size:11px;
  letter-spacing:.14em; text-transform:uppercase; color:var(--dim2);
}
.related ul{margin:0; padding-left:18px}
.related li{margin:5px 0; font-size:14px; line-height:1.6; color:var(--dim)}
.related a{color:var(--ice)}