/* Post layout: [toc | body | sidenote margin] */

.post-main {
  max-width: 86rem;
  margin: 0 auto;
  padding: 2rem 2rem 3rem;
}

/* Header */
.post-header { margin-bottom: 1rem; }
.ph-crumb {
  font-size: 11px;
  color: var(--ink-4);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.ph-crumb a { color: var(--ink-3); border-bottom: 0; }
.ph-crumb a:hover { color: var(--link); }
.ph-crumb .sep { color: var(--rule-strong); margin: 0 0.3rem; }

.ph-title {
  font-size: 2.6rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
  max-width: 44rem;
}
.ph-dek {
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--ink-2);
  font-style: italic;
  margin: 0.9rem 0 1.5rem;
  max-width: 44rem;
}

.ph-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  padding: 0.5rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  max-width: 58rem;
  line-height: 1.4;
}
.ph-meta .mi {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
  cursor: help;
}
.ph-meta .mi-v { color: var(--ink-2); line-height: 1; }
.ph-meta .mi-rel {
  color: var(--ink-4);
  font-style: italic;
  margin-left: 0.25rem;
  font-family: var(--font-serif);
  font-size: 0.92em;
}
.ph-meta .mi-ico {
  color: var(--accent);
  flex-shrink: 0;
  font-size: 11px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 11px;
  height: 11px;
}
.ph-meta .mi-ico svg { display: block; }
.ph-meta .mi-tags {
  white-space: normal;
  flex-wrap: wrap;
  row-gap: 0.1rem;
  column-gap: 0.4rem;
  cursor: default;
}
.ph-meta .mi-tags a {
  color: var(--link);
  border-bottom: 0;
  cursor: pointer;
}
.ph-meta .mi-tags a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* Three-column layout */
.post-layout {
  display: grid;
  grid-template-columns: 13rem minmax(0, 38rem) minmax(12rem, 18rem);
  gap: 2.5rem;
  margin-top: 2rem;
  align-items: start;
}

/* TOC */
.post-toc {
  position: sticky;
  top: 1.5rem;
  font-family: var(--font-sans);
  font-size: 12.5px;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
  padding-right: 0.5rem;
  border-right: 1px solid var(--rule);
}
.toc-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-4);
  margin-bottom: 0.6rem;
}
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list li { margin: 0.15rem 0; }
.toc-list a {
  display: flex;
  gap: 0.5rem;
  padding: 0.2rem 0.25rem;
  color: var(--ink-3);
  border: 0;
  border-left: 2px solid transparent;
  padding-left: 0.5rem;
  line-height: 1.35;
  transition: color 80ms, border-color 80ms;
}
.toc-list a:hover { color: var(--link); background: transparent; }
.toc-list li.active > a { color: var(--ink); border-left-color: var(--accent); }
.toc-list li.sub a { padding-left: 1.25rem; font-size: 11.5px; }
.toc-n { color: var(--ink-4); font-size: 10.5px; min-width: 2rem; }
.toc-t { text-wrap: pretty; }

.toc-progress {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}
.progress-label {
  font-size: 10px;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.3rem;
}
.progress-bar {
  height: 3px;
  background: var(--rule);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  transition: width 120ms;
}

/* Body */
.post-body {
  min-width: 0;
  font-size: 21px;
  line-height: 1.68;
}
.post-body p { max-width: 38rem; }
.post-body > section { margin-bottom: 1.5rem; }

.abstract {
  border-left: 2px solid var(--rule-strong);
  padding: 0.1rem 0 0.1rem 1.25rem;
  margin-bottom: 2.25rem;
}
.abs-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-4);
  margin-bottom: 0.5rem;
}
.abstract p {
  font-size: 0.97rem;
  color: var(--ink-2);
  margin: 0;
  max-width: 38rem;
}

.sig { color: var(--ink-4); font-size: 11px; margin-top: 2rem; }

/* Sidenotes: absolutely positioned into the right margin */
.post-body { position: relative; }

.sn-ref {
  font-family: var(--font-mono);
  font-size: 0.7em;
  cursor: pointer;
  color: var(--accent);
  vertical-align: super;
  line-height: 0;
  padding: 0 2px;
  user-select: none;
}
.sn-ref:hover .sn-n { text-decoration: underline; }
.sn-n { font-weight: 600; }

.sn-note {
  position: absolute;
  right: -20rem;
  width: 17rem;
  font-family: var(--font-serif);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-2);
  display: grid;
  grid-template-columns: 1.25rem 1fr;
  gap: 0.4rem;
  transform: translateY(-0.2em);
}
.sn-n-inline {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 10.5px;
  padding-top: 0.25em;
  font-weight: 600;
}
.sn-body { text-wrap: pretty; }
.sn-body em { font-style: italic; }
.sn-note a { font-size: inherit; }

/* Mobile: sidenotes collapse into tap-to-expand */
@media (max-width: 1100px) {
  .post-layout { grid-template-columns: 12rem minmax(0, 1fr); }
  .post-side { display: none; }
  .sn-note {
    position: static;
    width: auto;
    display: none;
    background: var(--paper-2);
    border-left: 2px solid var(--accent);
    padding: 0.5rem 0.75rem;
    margin: 0.5rem 0;
  }
  .sn-note.open { display: grid; }
}
@media (max-width: 760px) {
  .post-layout { grid-template-columns: 1fr; }
  .post-toc { position: static; border-right: 0; border-bottom: 1px solid var(--rule); padding-bottom: 1rem; margin-bottom: 1.5rem; }
  .ph-title { font-size: 2rem; }
  .ph-meta { grid-template-columns: 1fr 1fr; }
  .ph-meta-tags { grid-column: span 2; }
}

/* Backlinks, nested under the TOC sidebar */
.toc-backlinks {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}
.bl-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--font-sans);
  font-size: 11.5px;
  line-height: 1.4;
}
.bl-list li {
  display: grid;
  grid-template-columns: 0.9rem 1fr;
  gap: 0.3rem;
  align-items: baseline;
  padding: 0.25rem 0;
  color: var(--ink-3);
}
.bl-list a {
  color: var(--ink-2);
  border-bottom: 0;
  text-wrap: pretty;
}
.bl-list a:hover {
  color: var(--link);
  background: transparent;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}
.bl-glyph {
  color: var(--accent);
  font-size: 0.85em;
  line-height: 1;
  opacity: 0.7;
}

.post-foot {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 54rem;
}
.pf-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-4);
  margin-bottom: 0.4rem;
}
.pf-cite-block {
  font-size: 10.5px;
  background: var(--paper-2);
  padding: 0.75rem 1rem;
  margin: 0;
  color: var(--ink-2);
}
.pf-feedback { color: var(--ink-3); font-size: 11.5px; }
.pf-feedback a { color: var(--ink-2); border-bottom: 1px dotted var(--rule-strong); }