/* =============================================================================
   KANMMU · v3 “SPECTRAL VECTOR” — THE READING LAYER
   -----------------------------------------------------------------------------
   OWNER: pages-architect.  Styles _layouts/post.html (layout: post) and the
   legacy document layouts that wrap content in `.rd-doc`.

   A post is a document, not a deck.  The world stays as a fixed backdrop
   (document mode); `.rd-lane` is the controlled reading plate: a scrim bounded
   by two 1px rules, radius 0, no blur, no shadow.

   Type contract
     · body        19px / 1.72, measure 68ch
     · H1          clamp(40px, 5vw, 76px)
     · H2 / H3     32–40 / 22–27, hairline + mono index
     · blockquote  2px spectral left rule
     · code        --ink-1 body, 1px border, mono 15px
     · tables      hard top/bottom rules, no zebra
     · captions    mono 12px
     · links       ruled underline that draws on hover
   ========================================================================== */

/* =============================================================================
   0 · TOKENS
   ========================================================================== */
.rd-doc,
.rd-doc * { box-sizing: border-box; }

.rd-doc {
  --rd-measure: 68ch;
  --rd-frame: 880px;
  --rd-pad-x: clamp(22px, 3.4vw, 54px);
  --rd-body: 19px;
  --rd-lh: 1.72;
  --rd-gap: 1.45em;
  --rd-scrim-a: rgba(5, 6, 10, .60);
  --rd-scrim-b: rgba(5, 6, 10, .76);
  --rd-scrim-c: rgba(5, 6, 10, .84);
  position: relative;
  z-index: 2;
  padding: 0 0 clamp(60px, 8vh, 100px);
}

/* the title block starts just below the top bar: no dead air above the kicker
   (the lane enters at ~120–150px under the 64px header) */
body[data-sp-page='post'] .sp-track { padding-top: clamp(84px, 9.6vh, 108px); }

.rd-lane {
  position: relative;
  width: min(var(--rd-frame), calc(100vw - 520px));
  margin: 0 auto;
  background:
    linear-gradient(180deg,
      var(--rd-scrim-a) 0%,
      var(--rd-scrim-b) 12%,
      var(--rd-scrim-b) 55%,
      var(--rd-scrim-c) 100%);
  border-inline: 1px solid var(--line-1);
  box-shadow: none;
}

/* =============================================================================
   1 · HEADER
   ========================================================================== */
.rd-head { padding: clamp(24px, 2.2vw, 32px) var(--rd-pad-x) clamp(24px, 3vw, 38px); }
.rd-head__eyebrow { margin-bottom: clamp(20px, 2.6vw, 30px); }

.rd-title {
  font-family: var(--f-display);
  font-weight: 700;
  font-stretch: 106%;
  font-size: clamp(40px, 5vw, 76px);
  line-height: .98;
  letter-spacing: -.04em;
  color: var(--paper);
  text-wrap: balance;
  overflow-wrap: break-word;
}
/* CJK titles never letter-space as tightly as the Latin display cut */
.rd-title:lang(zh),
.rd-title [data-zh] {
  font-family: var(--f-cjk);
  font-weight: 700;
  letter-spacing: -.025em;
  line-height: 1.14;
}
.rd-title em {
  font-style: normal;
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
}

.rd-sub {
  margin-top: 20px;
  max-width: var(--rd-measure);
  font-family: var(--f-cjk);
  font-size: clamp(17px, 1.5vw, 21px);
  font-weight: 400;
  line-height: 1.5;
  color: var(--paper-2);
  text-wrap: pretty;
}

.rd-head__rule { margin: clamp(24px, 3vw, 38px) 0 0; }

/* meta bar: hairline cells, mono throughout */
.rd-metabar {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: start;
  gap: 0;
  margin-top: clamp(20px, 2.6vw, 30px);
  border-top: 1px solid var(--line-1);
  border-bottom: 1px solid var(--line-1);
}
.rd-meta {
  padding: 15px 22px;
  border-left: 1px solid var(--line-1);
  min-width: 0;
}
.rd-meta:first-child { border-left: 0; padding-left: 0; }
.rd-meta .sp-label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--dim);
}
.rd-meta b {
  display: block;
  font-family: var(--f-mono);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: .02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}
.rd-meta b a {
  color: inherit;
  border-bottom: 1px solid transparent;
  transition: border-color .24s var(--e-out);
}
.rd-meta b a:hover { border-bottom-color: var(--paper); }
.rd-meta small {
  display: block;
  margin-top: 6px;
  font-family: var(--f-mono);
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: .06em;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}

.rd-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
}
.rd-tags .sp-label { margin-right: 4px; font-size: 12px; color: var(--dim); }
.rd-tags .sp-chip { min-height: 32px; font-size: 12px; }

/* =============================================================================
   2 · ARTICLE / PROSE
   ========================================================================== */
.rd-article { padding: 0 var(--rd-pad-x) clamp(44px, 6vw, 78px); }
.rd-article__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  margin-bottom: clamp(24px, 3vw, 36px);
  border-bottom: 1px solid var(--line-2);
}
.rd-article__head .sp-label { font-size: 12px; color: var(--mute); }
.rd-article__len {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}
.rd-article__len b { color: var(--paper-2); font-weight: 400; }

.rd-prose {
  max-width: var(--rd-measure);
  font-family: var(--f-cjk);
  font-size: var(--rd-body);
  line-height: var(--rd-lh);
  letter-spacing: .006em;
  color: var(--paper-2);
  overflow-wrap: break-word;
}
.rd-prose p { margin: 0 0 var(--rd-gap); text-wrap: pretty; }
.rd-prose :is(p, li, blockquote):lang(en) { line-height: 1.7; }
.rd-prose > p:first-of-type { margin-top: 0; }

.rd-prose strong,
.rd-prose b { font-weight: 600; color: var(--paper); }
.rd-prose em,
.rd-prose i { font-style: italic; }

/* links: a hairline that becomes a solid rule on hover */
.rd-prose a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  transition: border-color .24s var(--e-out), color .2s;
}
.rd-prose a:hover,
.rd-prose a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* --- headings ----------------------------------------------------------- */
.rd-prose { counter-reset: rd-h2; }
.rd-prose h2 {
  position: relative;
  margin: 2.1em 0 .6em;
  padding-top: 1.75em;
  border-top: 1px solid var(--line-2);
  font-family: var(--f-display);
  font-weight: 700;
  font-stretch: 104%;
  font-size: clamp(28px, 2.7vw, 40px);
  line-height: 1.08;
  letter-spacing: -.03em;
  color: var(--paper);
  text-wrap: balance;
}
.rd-prose h2::before {
  content: counter(rd-h2, decimal-leading-zero);
  position: absolute;
  top: .62em;
  left: 0;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--dim);
  counter-increment: rd-h2;
}
.rd-prose > h2:first-child { margin-top: 0; border-top: 0; padding-top: 1.55em; }

.rd-prose h3 {
  margin: 1.9em 0 .55em;
  font-family: var(--f-display);
  font-weight: 600;
  font-stretch: 102%;
  font-size: clamp(21px, 1.9vw, 27px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: pretty;
}
.rd-prose h3::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 14px;
  margin-bottom: .28em;
  background: var(--grad);
  vertical-align: middle;
  opacity: .9;
}
.rd-prose h4 {
  margin: 1.7em 0 .4em;
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
}
.rd-prose h5,
.rd-prose h6 {
  margin: 1.5em 0 .35em;
  font-family: var(--f-cjk);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper-2);
}

/* heading anchors (injected by post.html) */
.rd-prose :is(h2, h3, h4) .rd-anchor {
  margin-left: .4em;
  font-family: var(--f-mono);
  font-size: .62em;
  font-weight: 400;
  color: var(--dim);
  text-decoration: none;
  border: 0;
  opacity: 0;
  transition: opacity .2s, color .2s;
}
.rd-prose :is(h2, h3, h4):hover .rd-anchor,
.rd-prose .rd-anchor:focus-visible { opacity: 1; }
.rd-prose .rd-anchor:hover { color: var(--paper); }

/* --- lists -------------------------------------------------------------- */
.rd-prose ul,
.rd-prose ol {
  margin: 0 0 var(--rd-gap);
  padding-left: 1.4em;
}
.rd-prose li { margin: .42em 0; position: relative; }
.rd-prose ul { list-style: none; padding-left: 1.35em; }
.rd-prose ul > li::before {
  content: '';
  position: absolute;
  left: -1.1em;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--line-3);
}
.rd-prose ol { counter-reset: rd-li; padding-left: 1.9em; list-style: none; }
.rd-prose ol > li::before {
  counter-increment: rd-li;
  content: counter(rd-li, decimal-leading-zero);
  position: absolute;
  left: -1.9em;
  top: .18em;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}
.rd-prose li > ul,
.rd-prose li > ol { margin: .45em 0 .2em; }
.rd-prose li > p { margin: 0 0 .4em; }

/* --- blockquote: the 2px spectral rule ---------------------------------- */
.rd-prose blockquote {
  position: relative;
  margin: 2em 0;
  padding: 4px 0 4px 26px;
  border: 0;
  font-family: var(--f-serif);
  font-size: clamp(20px, 1.7vw, 24px);
  font-style: italic;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--paper);
}
.rd-prose blockquote::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--grad);
}
.rd-prose blockquote p { margin: 0 0 .8em; }
.rd-prose blockquote p:last-child { margin-bottom: 0; }
.rd-prose blockquote em,
.rd-prose blockquote i { color: var(--paper-2); }
.rd-prose blockquote:lang(zh),
.rd-prose blockquote [data-zh] {
  font-family: var(--f-cjk);
  font-style: normal;
  font-size: .82em;
  line-height: 1.7;
}

.rd-prose hr {
  position: relative;
  height: 1px;
  margin: 2.6em 0;
  border: 0;
  background: var(--line-2);
}
.rd-prose hr::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 56px;
  height: 1px;
  background: var(--paper);
}

/* --- inline code -------------------------------------------------------- */
.rd-prose code {
  padding: 2px 6px;
  font-family: var(--f-mono);
  font-size: .82em;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--paper);
  background: var(--ink-1);
  border: 1px solid var(--line-1);
  border-radius: 0;
  overflow-wrap: break-word;
}
.rd-prose a > code { border-color: var(--line-2); }
.rd-prose kbd {
  padding: 2px 6px;
  font-family: var(--f-mono);
  font-size: .78em;
  color: var(--paper);
  background: var(--ink-2);
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 0;
}

/* --- code blocks -------------------------------------------------------- */
.rd-prose div.highlighter-rouge,
.rd-prose div.highlight { margin: 2em 0; }

.rd-prose div.highlighter-rouge > div.highlight {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  background: var(--ink-1);
  border: 1px solid var(--line-1);
  border-radius: 0;
  -webkit-overflow-scrolling: touch;
}
.rd-prose div.highlighter-rouge > div.highlight::-webkit-scrollbar { height: 4px; }
.rd-prose div.highlighter-rouge > div.highlight::-webkit-scrollbar-track { background: var(--ink-0); }
.rd-prose div.highlighter-rouge > div.highlight::-webkit-scrollbar-thumb { background: var(--line-2); }

.rd-prose pre,
.rd-prose pre.highlight,
.rd-prose code.highlighter-rouge {
  margin: 0;
  padding: 20px 22px;
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0;
  color: var(--paper-2);
  background: var(--ink-1);
  border: 1px solid var(--line-1);
  border-radius: 0;
  overflow-x: auto;
  tab-size: 2;
}
.rd-prose > pre,
.rd-prose > pre.highlight { margin: 2em 0; }
.rd-prose pre.highlight { padding: 20px 22px; background: var(--ink-1); }
.rd-prose pre.highlight > code,
.rd-prose pre > code {
  padding: 0;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  white-space: pre;
}

/* line-numbered blocks (Rouge table layout) */
.rd-prose table.rouge-table { width: 100%; margin: 0; border: 0; }
.rd-prose table.rouge-table td { padding: 0; border: 0; vertical-align: top; }
.rd-prose table.rouge-table td.rouge-gutter {
  width: 1%;
  background: rgba(255, 255, 255, .012);
  border-right: 1px solid var(--line-1);
}
.rd-prose table.rouge-table td.rouge-gutter pre.lineno {
  padding: 20px 12px 20px 16px;
  color: var(--dim);
  text-align: right;
  user-select: none;
  border: 0;
  background: none;
}
.rd-prose table.rouge-table td.rouge-code { padding: 0; }
.rd-prose table.rouge-table td.rouge-code pre {
  padding: 20px 22px 20px 18px;
  border: 0;
  background: none;
}
.rd-prose table.rouge-table td.rouge-code pre code { white-space: pre; }

/* monochrome syntax: weight and value, not a rainbow */
.rd-prose .highlight .c,
.rd-prose .highlight .c1,
.rd-prose .highlight .cm,
.rd-prose .highlight .cs,
.rd-prose .highlight .cd,
.rd-prose .highlight .ch { color: var(--dim); font-style: normal; }
.rd-prose .highlight .k,
.rd-prose .highlight .kd,
.rd-prose .highlight .kn,
.rd-prose .highlight .kp,
.rd-prose .highlight .kr,
.rd-prose .highlight .kt,
.rd-prose .highlight .kc { color: var(--paper); font-weight: 500; }
.rd-prose .highlight .s,
.rd-prose .highlight .s1,
.rd-prose .highlight .s2,
.rd-prose .highlight .sb,
.rd-prose .highlight .sc,
.rd-prose .highlight .sd,
.rd-prose .highlight .se,
.rd-prose .highlight .sh,
.rd-prose .highlight .si,
.rd-prose .highlight .sx,
.rd-prose .highlight .sr,
.rd-prose .highlight .ss,
.rd-prose .highlight .sa,
.rd-prose .highlight .dl { color: var(--paper-2); }
.rd-prose .highlight .m,
.rd-prose .highlight .mf,
.rd-prose .highlight .mh,
.rd-prose .highlight .mi,
.rd-prose .highlight .mo,
.rd-prose .highlight .il,
.rd-prose .highlight .mb,
.rd-prose .highlight .mx { color: var(--paper-2); }
.rd-prose .highlight .na,
.rd-prose .highlight .nb,
.rd-prose .highlight .nc,
.rd-prose .highlight .nd,
.rd-prose .highlight .ne,
.rd-prose .highlight .nf,
.rd-prose .highlight .nl,
.rd-prose .highlight .nn,
.rd-prose .highlight .nt,
.rd-prose .highlight .nv,
.rd-prose .highlight .no,
.rd-prose .highlight .py { color: var(--paper); }
.rd-prose .highlight .cp,
.rd-prose .highlight .cpf,
.rd-prose .highlight .gh,
.rd-prose .highlight .gu { color: var(--mute); }
.rd-prose .highlight .gd { color: var(--g-rose); }
.rd-prose .highlight .gi { color: var(--g-lime); }
.rd-prose .highlight .err,
.rd-prose .highlight .gr { color: var(--g-rose); background: none; }
.rd-prose .highlight .w { color: var(--dim); }

/* --- tables: hard rules, no zebra --------------------------------------- */
.rd-tablewrap {
  margin: 2em 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.rd-tablewrap::-webkit-scrollbar { height: 4px; }
.rd-tablewrap::-webkit-scrollbar-thumb { background: var(--line-2); }
.rd-prose .rd-tablewrap > table { width: max-content; min-width: 100%; margin: 0; }

.rd-prose table {
  width: 100%;
  margin: 2em 0;
  border-collapse: collapse;
  font-family: var(--f-cjk);
  font-size: 15px;
  line-height: 1.6;
}
.rd-prose table td,
.rd-prose table th { overflow-wrap: anywhere; }
.rd-prose thead { background: none; }
.rd-prose th {
  padding: 10px 14px 10px 0;
  border-top: 2px solid var(--line-3);
  border-bottom: 1px solid var(--line-2);
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mute);
  text-align: left;
  vertical-align: bottom;
}
.rd-prose td {
  padding: 12px 14px 12px 0;
  border-bottom: 1px solid var(--line-1);
  color: var(--paper-2);
  vertical-align: top;
  font-variant-numeric: tabular-nums;
}
.rd-prose tbody tr:last-child td { border-bottom: 1px solid var(--line-2); }
.rd-prose tbody tr:hover td { background: rgba(255, 255, 255, .02); }
.rd-prose th:first-child,
.rd-prose td:first-child { padding-left: 0; }
.rd-prose th:last-child,
.rd-prose td:last-child { padding-right: 0; }

/* --- media -------------------------------------------------------------- */
.rd-prose img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-1);
  background: var(--ink-1);
}
.rd-prose p > img:only-child { margin: 2em auto; }
.rd-prose a > img { border-color: var(--line-2); }
.rd-prose a:hover > img { border-color: var(--line-3); }

.rd-prose figure { margin: 2.2em 0; padding: 0; }
.rd-prose figure img { margin: 0 auto; }
.rd-prose figcaption {
  margin-top: 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  line-height: 1.55;
  letter-spacing: .06em;
  color: var(--dim);
  text-wrap: pretty;
}
.rd-prose figcaption b,
.rd-prose figcaption strong { color: var(--mute); font-weight: 500; }

.rd-prose iframe {
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 2em 0;
  border: 1px solid var(--line-1);
  background: var(--ink-1);
}
.rd-prose video { width: 100%; height: auto; margin: 2em 0; border: 1px solid var(--line-1); }

.rd-prose .katex-display {
  margin: 1.8em 0;
  padding: 14px 0;
  overflow-x: auto;
  overflow-y: hidden;
  border-top: 1px solid var(--line-1);
  border-bottom: 1px solid var(--line-1);
}
.rd-prose .katex { font-size: 1.02em; }

.rd-prose .footnotes {
  margin-top: 2.6em;
  padding-top: 20px;
  border-top: 1px solid var(--line-2);
  font-size: 15px;
  line-height: 1.7;
  color: var(--mute);
}
.rd-prose .footnotes ol { padding-left: 1.9em; }

/* =============================================================================
   3 · READING PROGRESS + CATALOG
   ========================================================================== */
.rd-prog {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 45;
  height: 2px;
  background: transparent;
  pointer-events: none;
}
.rd-prog i {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--grad);
  transform: scaleX(var(--rd-p, 0));
  transform-origin: 0 50%;
}

.rd-toc {
  position: fixed;
  right: max(24px, calc((100vw - 880px) / 2 - 224px));
  top: 50%;
  translate: 0 -50%;
  z-index: 30;
  width: 196px;
  max-height: 62vh;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.rd-toc[data-empty='1'] { display: none; }
.rd-toc__hd {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-2);
}
.rd-toc__hd .sp-label { font-size: 12px; color: var(--dim); }
.rd-toc__pct {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--paper-2);
  font-variant-numeric: tabular-nums;
}
.rd-toc__list {
  flex: 1 1 auto;
  min-height: 0;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  list-style: none;
}
.rd-toc__list::-webkit-scrollbar { width: 2px; }
.rd-toc__list::-webkit-scrollbar-thumb { background: var(--line-2); }
.rd-toc__li { margin: 0; }
.rd-toc__li--h3 { padding-left: 14px; }
.rd-toc__a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 0 7px 11px;
  font-family: var(--f-cjk);
  font-size: 12.5px;
  line-height: 1.35;
  color: var(--mute);
  transition: color .2s;
}
.rd-toc__li--h3 .rd-toc__a { font-size: 12px; color: var(--dim); }
.rd-toc__no {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}
.rd-toc__li--h3 .rd-toc__no { display: none; }
.rd-toc__a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: var(--paper);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform .3s var(--e-out);
}
.rd-toc__a:hover { color: var(--paper-2); }
.rd-toc__a[aria-current='true'] { color: var(--paper); }
.rd-toc__a[aria-current='true']::before { transform: scaleY(1); }
.rd-toc__a[aria-current='true'] .rd-toc__no { color: var(--paper-2); }
.rd-toc__back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--line-1);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
  transition: color .2s;
}
.rd-toc__back:hover { color: var(--paper); }
.rd-toc__back svg { width: 11px; height: 11px; fill: none; stroke: currentColor; stroke-width: 1.4; }

/* =============================================================================
   4 · COMMENTS / END MATTER
   ========================================================================== */
.rd-comments {
  padding: clamp(30px, 4vw, 52px) var(--rd-pad-x);
  border-top: 1px solid var(--line-1);
}
.rd-comments__hd {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}
.rd-comments__hd .sp-label { font-size: 12px; color: var(--dim); }
.rd-comments__mount {
  position: relative;
  padding: 18px;
  border: 1px solid var(--line-1);
  background: rgba(9, 11, 16, .5);
  min-height: 120px;
}
.rd-comments__mount iframe { width: 100% !important; border: 0; }
.rd-comments__fallback {
  display: grid;
  place-items: center;
  min-height: 84px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--dim);
  transition: opacity .3s;
}
.rd-comments__mount[data-loaded='1'] .rd-comments__fallback { opacity: 0; }

.rd-end {
  padding: clamp(30px, 4vw, 52px) var(--rd-pad-x) clamp(34px, 4.4vw, 58px);
  border-top: 1px solid var(--line-2);
}
.rd-end__hd {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}
.rd-end__hd .sp-label { font-size: 12px; color: var(--dim); }
.rd-pn {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-1);
}
.rd-pn__a {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 0;
  transition: background .3s var(--e-out), padding .3s var(--e-out);
}
.rd-pn__a + .rd-pn__a { border-left: 1px solid var(--line-1); padding-left: 24px; }
.rd-pn__a:hover { background: rgba(255, 255, 255, .025); }
.rd-pn__a--next { text-align: right; align-items: flex-end; padding-left: 24px; }
.rd-pn__k {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--dim);
  transition: color .2s;
}
.rd-pn__a:hover .rd-pn__k { color: var(--paper); }
.rd-pn__k svg {
  width: 12px;
  height: 12px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  transition: transform .3s var(--e-out);
}
.rd-pn__a:hover .rd-pn__k svg { transform: translateX(-3px); }
.rd-pn__a--next:hover .rd-pn__k svg { transform: translateX(3px); }
.rd-pn__t {
  font-family: var(--f-cjk);
  font-size: 16px;
  line-height: 1.45;
  color: var(--paper-2);
  transition: color .2s;
}
.rd-pn__a:hover .rd-pn__t { color: var(--paper); }
.rd-pn__a--empty { opacity: .42; }

.rd-end__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-top: clamp(26px, 3vw, 40px);
  padding-top: 18px;
  border-top: 1px solid var(--line-1);
}
.rd-end__links { display: flex; flex-wrap: wrap; gap: 26px; }
.rd-end__note {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--dim);
  text-transform: uppercase;
}

/* =============================================================================
   5 · RESPONSIVE
   ========================================================================== */
@media (max-width: 1240px) {
  .rd-lane { width: min(var(--rd-frame), calc(100vw - 96px)); }
  .rd-toc { display: none; }
}

@media (max-width: 900px) {
  .rd-lane {
    width: 100%;
    border-inline: 0;
    background: rgba(5, 6, 10, .84);
  }
  .rd-doc { padding-top: 0; }
  .rd-head { padding-top: clamp(30px, 7vw, 46px); }
}

@media (max-width: 620px) {
  .rd-doc {
    --rd-measure: none;
    --rd-pad-x: 20px;
    --rd-body: 18px;
    --rd-lh: 1.7;
  }
  .rd-title { font-size: clamp(32px, 9vw, 40px); line-height: 1.06; overflow-wrap: anywhere; }
  .rd-sub { font-size: 16px; }
  .rd-metabar { grid-template-columns: 1fr 1fr; }
  .rd-meta { padding: 12px 14px; }
  .rd-meta:first-child { padding-left: 0; }
  .rd-meta:nth-child(3) { border-left: 0; padding-left: 0; }
  .rd-prose h2 { margin-top: 1.9em; }
  .rd-prose pre,
  .rd-prose pre.highlight { padding: 16px 16px; font-size: 13.5px; }
  .rd-prose blockquote { padding-left: 18px; }
  .rd-pn { grid-template-columns: 1fr; }
  .rd-pn__a + .rd-pn__a { border-left: 0; border-top: 1px solid var(--line-1); padding-left: 0; }
  .rd-pn__a--next { text-align: left; align-items: flex-start; }
  .rd-article__head { flex-direction: column; align-items: flex-start; gap: 6px; }
  .rd-prose table { font-size: 14px; }
}

@media (max-width: 420px) {
  .rd-doc { --rd-pad-x: 18px; --rd-body: 18px; --rd-lh: 1.68; }
  .rd-title { font-size: 31px; }
  .rd-meta { padding: 11px 10px; }
  .rd-meta b { font-size: 13px; }
  .rd-prose h2 { font-size: 26px; }
  .rd-prose h3 { font-size: 20px; }
  .rd-prose pre,
  .rd-prose pre.highlight { font-size: 13px; padding: 14px 14px; }
  .rd-end__links { gap: 18px; }
}

/* =============================================================================
   6 · MOTION / PRINT
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .rd-prog i,
  .rd-toc__a::before,
  .rd-anchor,
  .rd-pn__k svg { transition: none; }
}

@media print {
  .sp-topbar, .rd-toc, .rd-prog, .sp-cursor, .sp-frame, .sp-plate,
  #sp-gl, .rd-comments { display: none !important; }
  .rd-doc { padding: 0; }
  .rd-lane { width: auto; background: #fff; border: 0; }
  .rd-prose { color: #111; max-width: none; font-size: 11.5pt; }
  .rd-prose h2, .rd-prose h3, .rd-title { color: #000; }
  .rd-prose a { color: #111; border-bottom-color: #999; }
  .rd-prose pre, .rd-prose code { background: #f4f4f2; color: #111; border-color: #ccc; }
}