about.css

/* ========================================
   BIODYN , About, "Turntable"
   The opening view is sized to one screen. The
   case selector sits above the figure. Opening
   an area keeps the figure pinned beside the
   detail so it can morph a level deeper.
   ======================================== */

.tt-main-wrap {
  padding-top: 0;
  padding-bottom: 0;
}

.tt-root {
  /* The nav shrinks to ~65px once scrolled; anything sticky has to sit exactly
     under it, or page content shows through the gap between the two. */
  --tt-stick: 66px;

  /* The opening view has to land inside one screen, with no clipped line of
     type at the fold. Everything above the detail is budgeted against svh. */
  min-height: max(660px, 100svh);
  display: flex;
  flex-direction: column;
  padding-top: clamp(92px, 13vh, 148px);
  padding-bottom: clamp(24px, 4vh, 48px);
}

/* ---------------------------------------
   Masthead
   --------------------------------------- */

.tt-masthead {
  flex: none;
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr);
  grid-template-areas:
    "eyebrow eyebrow"
    "title   lede";
  column-gap: clamp(30px, 4vw, 66px);
  align-items: end;
}

.tt-masthead .ab-eyebrow {
  grid-area: eyebrow;
  margin-bottom: clamp(12px, 2vh, 22px);
}

.tt-masthead .ab-display {
  grid-area: title;
  font-size: clamp(1.9rem, 3.5vw + 0.3rem, 3.5rem);
  line-height: 1.04;
}

.tt-masthead .ab-lede {
  grid-area: lede;
  max-width: 42ch;
  font-size: clamp(0.9rem, 0.42vw + 0.78rem, 1.02rem);
  line-height: 1.72;
  padding-bottom: 0.4em;
}

/* ---------------------------------------
   Case selector, above the figure
   --------------------------------------- */

.tt-rail {
  flex: none;
  display: flex;
  margin-top: clamp(18px, 3vh, 34px);
  border-bottom: 1px solid var(--ab-line);
}

.tt-rail-item {
  position: relative;
  flex: 1 1 0;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: clamp(10px, 1.6vh, 16px) 20px clamp(12px, 1.8vh, 18px) 0;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--ab-faint);
  font: inherit;
  transition: color var(--transition-medium);
}

.tt-rail-item::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--tt-c);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.55s cubic-bezier(0.22, 0.7, 0.2, 1);
}

.tt-rail-item.is-active::after { transform: scaleX(1); }
.tt-rail-item.is-active,
.tt-rail-item:hover { color: var(--ab-bone); }

.tt-rail-item[data-channel="1"] { --tt-c: var(--ab-ch1); }
.tt-rail-item[data-channel="2"] { --tt-c: var(--ab-ch2); }
.tt-rail-item[data-channel="3"] { --tt-c: var(--ab-ch3); }

.tt-rail-num {
  flex: none;
  font-family: var(--ab-font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  color: var(--tt-c);
}

.tt-rail-name {
  font-family: var(--ab-font-display);
  font-size: clamp(1.02rem, 0.7vw + 0.8rem, 1.32rem);
  line-height: 1.2;
}

/* ---------------------------------------
   Grid: figure beside text, then beside detail
   --------------------------------------- */

.tt-grid {
  /* Basis 0 so the figure takes exactly the space left over by the masthead,
     rail and closing line , the opening view then always lands on one screen
     instead of depending on a hand-added budget. */
  flex: 1 1 0;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  grid-template-areas:
    "visual text"
    "visual detail";
  grid-template-rows: 1fr 0fr;
  column-gap: clamp(28px, 4vw, 64px);
  margin-top: clamp(14px, 2.4vh, 28px);
}

/* Once the detail is out the view is meant to scroll, and the reading column
   takes the larger share so the papers can sit two-up. */
.tt-root.is-open .tt-grid {
  flex: 0 0 auto;
  grid-template-columns: minmax(0, 0.64fr) minmax(0, 1.36fr);
  grid-template-rows: 0fr auto;
}

.tt-visual {
  grid-area: visual;
  align-self: stretch;
  height: 100%;
  min-height: 0;
}

.tt-root.is-open .tt-visual { height: auto; }

/* The inactive panel is removed outright rather than clipped: clipped content
   that is still focusable conflicts with its own aria-hidden, and an
   overflow-hidden ancestor would also kill the sticky rail inside the detail. */
.tt-argument {
  grid-area: text;
  align-self: start;
  min-height: 0;
}

.tt-root.is-open .tt-argument { display: none; }

.tt-detail {
  grid-area: detail;
  align-self: start;
  min-height: 0;
  display: none;
}

.tt-root.is-open .tt-detail {
  display: block;
  animation: tt-detail-in 0.6s cubic-bezier(0.22, 0.7, 0.2, 1);
}

@keyframes tt-detail-in {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: none; }
}

/* ---------------------------------------
   Chamber
   --------------------------------------- */

.tt-chamber {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 220px;
}

/* Pinned while the detail scrolls past, so the figure stays with the text. */
.tt-root.is-open .tt-chamber {
  position: sticky;
  top: var(--tt-stick);
  height: clamp(230px, 38vh, 400px);
}

.tt-canvas {
  cursor: grab;
  touch-action: pan-y;
}

.tt-canvas.is-dragging { cursor: grabbing; }
.tt-canvas:focus-visible { outline: 2px solid var(--ab-ch); outline-offset: 3px; }

.tt-grab {
  position: absolute;
  left: 12px;
  bottom: 10px;
  font-family: var(--ab-font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ab-faint);
  opacity: 0.6;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.tt-chamber.is-touched .tt-grab { opacity: 0; }

/* ---------------------------------------
   Argument
   --------------------------------------- */

.tt-numeral {
  font-size: clamp(1.7rem, 1.6vw + 1rem, 2.4rem);
  margin-bottom: clamp(6px, 1vh, 14px);
}

.tt-argument .ab-case-title {
  font-size: clamp(1.4rem, 1.5vw + 0.75rem, 2.15rem);
  margin-bottom: clamp(10px, 1.6vh, 18px);
}

.tt-argument .ab-case-body {
  font-size: clamp(0.9rem, 0.4vw + 0.78rem, 1rem);
  line-height: 1.72;
  max-width: 46ch;
}

.tt-more { margin-top: clamp(16px, 2.4vh, 28px); }

/* ---------------------------------------
   Detail
   --------------------------------------- */

/* The header and the four area tabs stay pinned, so moving between areas
   never means scrolling back to the top of the list. */
.tt-detail-bar {
  position: sticky;
  top: var(--tt-stick);
  z-index: 3;
  background: var(--ab-field);
  padding-bottom: 2px;
  /* Paints the field a little above the bar as well, so a subpixel seam or the
     nav's shrink transition cannot open a window onto the scrolling text. */
  box-shadow: 0 -14px 0 0 var(--ab-field);
}

.tt-detail-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 14px;
}

.tt-detail-title {
  font-family: var(--ab-font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 1.6vw + 0.7rem, 1.95rem);
  line-height: 1.15;
  color: var(--ab-bone);
}

.tt-close {
  flex: none;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--ab-line);
  border-radius: 2px;
  color: var(--ab-dim);
  font-family: var(--ab-font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.tt-close:hover { border-color: var(--ab-ch); color: var(--ab-ch); }

.tt-detail-lede {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ab-dim);
  padding: 18px 0 2px;
}

/* Area tabs */

.tt-tabs {
  display: flex;
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.tt-tab {
  position: relative;
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 11px 14px 12px 0;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--ab-faint);
  font: inherit;
  transition: color var(--transition-medium);
}

.tt-tab::after {
  content: '';
  position: absolute;
  left: 0;
  right: 8px;
  bottom: -1px;
  height: 1px;
  background: var(--ab-ch);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.45s cubic-bezier(0.22, 0.7, 0.2, 1);
}

.tt-tab.is-active::after { transform: scaleX(1); }
.tt-tab.is-active, .tt-tab:hover { color: var(--ab-bone); }

.tt-tab-index {
  font-family: var(--ab-font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--ab-faint);
  transition: color var(--transition-medium);
}

.tt-tab.is-active .tt-tab-index { color: var(--ab-ch); }

.tt-tab-name {
  font-family: var(--ab-font-display);
  font-size: clamp(0.95rem, 0.5vw + 0.78rem, 1.14rem);
  line-height: 1.18;
}

/* The panel grows in rather than sliding a spoiler open */

.tt-panel { padding-top: clamp(20px, 3vh, 32px); }

.tt-panel.is-entering {
  animation: tt-panel-in 0.62s cubic-bezier(0.22, 0.7, 0.2, 1);
}

@keyframes tt-panel-in {
  from { opacity: 0; transform: translateY(20px) scale(0.985); }
  to   { opacity: 1; transform: none; }
}

.tt-panel-title {
  font-family: var(--ab-font-display);
  font-weight: 400;
  font-size: clamp(1.55rem, 1.9vw + 0.75rem, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ab-bone);
  margin-bottom: 12px;
  max-width: 22ch;
}

.tt-panel-note {
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--ab-dim);
  max-width: 62ch;
  margin-bottom: clamp(20px, 3vh, 30px);
}

.tt-panel-count {
  display: block;
  font-family: var(--ab-font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ab-faint);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ab-line);
  margin-bottom: 20px;
}

.tt-panel .ab-refs {
  grid-template-columns: repeat(auto-fill, minmax(246px, 1fr));
  gap: 18px 34px;
  padding-bottom: 8px;
}

/* ---------------------------------------
   Responsive
   --------------------------------------- */

/* On a short laptop screen the case text, not the figure, is what stops the
   opening view fitting. Trim the text rather than let it spill past the fold. */
@media (min-width: 1001px) and (max-height: 840px) {
  .tt-numeral { font-size: 1.5rem; margin-bottom: 4px; }
  .tt-argument .ab-case-title { font-size: clamp(1.24rem, 1.2vw + 0.62rem, 1.62rem); margin-bottom: 9px; }
  .tt-argument .ab-case-body { font-size: 0.87rem; line-height: 1.6; max-width: 44ch; }
  .tt-more { margin-top: 14px; padding: 10px 17px; }
  .tt-masthead .ab-lede { font-size: 0.9rem; line-height: 1.62; }
}

@media (max-width: 1000px) {
  .tt-root { min-height: 0; padding-top: clamp(96px, 14vh, 140px); }

  .tt-masthead {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "eyebrow" "title" "lede";
    row-gap: 20px;
  }
  .tt-masthead .ab-eyebrow { margin-bottom: 0; }
  .tt-masthead .ab-lede { max-width: 60ch; padding-bottom: 0; }

  .tt-grid,
  .tt-root.is-open .tt-grid {
    /* The desktop grid takes a flex basis of 0 so the figure absorbs the
       leftover height. Stacked, there is no leftover to absorb: leaving it
       collapses the grid to zero and the figure and the text overlap. */
    flex: 0 0 auto;
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "visual" "text" "detail";
    grid-template-rows: auto auto auto;
    row-gap: 26px;
  }

  .tt-visual,
  .tt-root.is-open .tt-visual { height: auto; }

  /* Stacked, the pinned figure and the detail bar are two sticky elements in a
     row, so both offsets have to come from the same number. --tt-fig is the
     pinned figure height; the bar sits directly under it. --tt-stick is a
     couple of px under the mobile nav, which stays 82px tall, so the bar
     tucks beneath it instead of leaving a gap. */
  .tt-root {
    --tt-stick: 78px;
    --tt-fig: clamp(170px, 48vw, 220px);
  }

  .tt-chamber { height: min(400px, 78vw); }

  /* Stacked, the figure sits above the detail rather than beside it, so its
     sticky containing block is exactly its own height: it has nowhere to
     travel and only leaves a dead band under the nav with the panel text
     sliding through it. The bar takes the pin instead. */
  .tt-root.is-open .tt-chamber {
    position: static;
    height: var(--tt-fig);
    min-height: 0;
  }

  .tt-detail-bar { top: var(--tt-stick); }
}

@media (max-width: 720px) {
  .tt-rail { flex-direction: column; }
  .tt-rail-item {
    padding: 12px 0;
    border-top: 1px solid var(--ab-line);
  }
  .tt-rail-item:first-child { border-top: 0; }
  .tt-rail-item::after { bottom: auto; top: 0; }
  .tt-tabs { flex-wrap: wrap; }
  .tt-tab { flex: 1 1 42%; padding-right: 10px; }
  .tt-panel .ab-refs { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .tt-grid, .tt-chamber, .tt-argument, .tt-detail,
  .tt-app-body, .tt-rail-item::after { transition: none; }
}

/* ---------------------------------------
   Embedded on the main page
   --------------------------------------- */

/* The same experience, running below the hero rather than as its own page, so
   it brings its own field instead of inheriting one from .ab-body. */
.tt-embed {
  background: var(--ab-field);
  color: var(--ab-bone);
}

.tt-embed .tt-root {
  padding-top: clamp(52px, 7vh, 96px);
  padding-bottom: clamp(40px, 6vh, 80px);
  min-height: max(620px, 92svh);
}



/* Mono labels are set in rem against a base that shrinks on a phone, which
   pushes them under 11px. Hold them at the legibility floor. */
@media (max-width: 600px) {
  .tt-rail-num { font-size: 0.72rem; }
}