/* ============================================================
   Kishaan Gidda — BLOG layout
   Mode: Read. Same world as the home page, tuned for a single
   long-form article: a masthead, a sticky contents rail, and
   one comfortable measure of text.
   ============================================================ */

main { position: relative; z-index: 1; }

/* ============================================================
   MASTHEAD — the silk appears once here, then the page is paper
   ============================================================ */

.masthead {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: min(78svh, 660px);
  padding: calc(var(--bar-top) + 72px) var(--gutter) clamp(56px, 8vh, 96px);
}
.masthead-inner {
  width: min(1320px, 100%);
  margin: 0 auto;
}

/* the plate dissolves into the paper rather than stopping dead */
.masthead-silk {
  mask-image: linear-gradient(to bottom, #000 74%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, #000 74%, transparent 100%);
}

.masthead-title {
  margin-top: 20px;
  max-width: 16ch;
  font-size: clamp(2.4rem, 6.4vw, 5.6rem);
  letter-spacing: -0.038em;
  line-height: 1.0;
}
.masthead-standfirst {
  margin-top: 30px;
  max-width: 48ch;
  font-size: clamp(1.02rem, 1.5vw, 1.2rem);
  line-height: 1.58;
  color: var(--ink);
}
.masthead-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 30px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.masthead-meta .sep { color: var(--ink-faint); }

/* ============================================================
   ARTICLE — contents rail + one measure of prose
   Column tracks are exact quarters with no gap, so both the
   rail and the text start on a hairline. See home.css.
   ============================================================ */

.article {
  position: relative;
  width: var(--container);
  margin: 0 auto;
  padding: clamp(72px, 10vh, 132px) 0 clamp(96px, 12vh, 168px);
  display: grid;
  grid-template-columns: 25% 75%;
  align-items: start;
  border-top: 1px solid var(--rule);
}

.reading-index {
  position: sticky;
  top: calc(var(--bar-top) + clamp(28px, 6vh, 64px));
  padding-right: var(--gutter);
}
.reading-index .label { margin-bottom: 14px; }
.reading-index ol { border-top: 1px solid var(--rule); }
.reading-index li { border-bottom: 1px solid var(--rule); position: relative; }
.reading-index a {
  display: block;
  padding: 12px 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
  transition: color 260ms var(--ease), transform 260ms var(--ease);
}
.reading-index a:hover { color: var(--display); }
.reading-index a.on { color: var(--display); transform: translateX(12px); }
.reading-index li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 1px;
  height: 20px;
  background: var(--display);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 300ms var(--ease);
}
.reading-index li:has(a.on)::before { transform: scaleY(1); }

/* ---- prose ---- */

.prose {
  /* the measure lives in the first two of the three right-hand
     tracks; the third stays empty so the page keeps breathing */
  max-width: 68ch;
  padding-right: var(--gutter);
}

.prose section + section { margin-top: clamp(48px, 6vh, 76px); }

.prose h2 {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 22px;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  line-height: 1.14;
}
.h-num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  transform: translateY(-0.35em);
}

.prose p {
  margin-bottom: 20px;
  font-size: 1.04rem;
  line-height: 1.72;
  color: var(--ink);
}
.prose p:last-child { margin-bottom: 0; }

.prose a:not(.br) {
  color: var(--display);
  border-bottom: 1px solid var(--rule);
  transition: border-color 200ms var(--ease);
}
.prose a:not(.br):hover { border-bottom-color: var(--display); }

.prose-list { margin: 4px 0 20px; }
.prose-list li {
  position: relative;
  padding: 11px 0 11px 28px;
  font-size: 1.02rem;
  line-height: 1.66;
  color: var(--ink);
  border-bottom: 1px solid var(--rule-soft);
}
.prose-list li:first-child { border-top: 1px solid var(--rule-soft); }
.prose-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 21px;
  width: 12px;
  height: 1px;
  background: var(--ink-faint);
}

/* ---- end matter ---- */

.article-end { margin-top: clamp(56px, 7vh, 88px); }
.article-sign {
  margin-top: 22px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.article-links {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin: 22px 0 0 -12px;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 900px) {
  .masthead { min-height: 68svh; }
  .masthead-title { max-width: 100%; }

  .article { display: block; }
  /* with the prose in one column the rail becomes a real table
     of contents at the top, not a sticky sidebar */
  .reading-index {
    position: static;
    padding-right: 0;
    margin-bottom: 44px;
  }
  .reading-index a.on { transform: translateX(12px); }

  .prose { max-width: 100%; padding-right: 0; }
}

@media (max-width: 620px) {
  .masthead-title { font-size: clamp(2rem, 10vw, 3rem); }
  .prose h2 { gap: 10px; }
}