/* ==========================================================================
   Section 2 — Built for Progress
   A pinned scroll scene on a blueprint grid: copy on the left, a tower
   elevation on the right that rises floor by floor as the visitor scrolls.
   Progress (0 → 1) is written to --p on .about by js/about.js.
   ========================================================================== */

.about {
  --blueprint: rgba(163, 184, 214, 0.07);
  --steel: #8fa6c4;
  --p: 0;

  position: relative;
  height: 240vh;
  /* solid ink at the very top so the diagonal edge joins seamlessly */
  background:
    linear-gradient(180deg, var(--ink) 0, rgba(10, 18, 32, 0) 28vh),
    radial-gradient(120% 80% at 85% 20%, rgba(25, 67, 118, 0.38) 0%, rgba(25, 67, 118, 0) 60%),
    linear-gradient(180deg, var(--ink) 0%, #0c1830 100%);
  color: var(--white);
}

.about__pin {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  display: flex;
  align-items: center;
}

/* Blueprint grid — major and minor lines, faded toward the edges */
.about__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--blueprint) 1px, transparent 1px),
    linear-gradient(90deg, var(--blueprint) 1px, transparent 1px),
    linear-gradient(rgba(163, 184, 214, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(163, 184, 214, 0.035) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  background-position: center;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 60% 50%, #000 30%, transparent 85%);
  mask-image: radial-gradient(ellipse 80% 70% at 60% 50%, #000 30%, transparent 85%);
  transform: translateY(calc(var(--p) * -60px));
  opacity: 0;
  transition: opacity 1.4s ease;
}
.about.in-view .about__grid { opacity: 1; }

.about__inner {
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(2rem, 6vw, 7rem);
  align-items: center;
  padding: calc(100px + 2rem) calc(var(--gutter) + clamp(0rem, 6.5vw, 8rem)) 2rem;
}

.about__copy { min-width: 0; }

/* Eyebrow */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--silver-dim);
}
.eyebrow__rule {
  display: block;
  width: 48px;
  height: 1px;
  background: currentColor;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 1.2s var(--ease-out) 0.1s;
}
.about.in-view .eyebrow__rule { transform: scaleX(1); }

/* Headline — each word rises out of its own mask */
.about__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(3rem, 6.4vw, 7rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
}
.about__title em {
  font-style: italic;
  font-weight: 500;
  color: var(--silver);
}
.word-mask {
  display: inline-block;
  overflow: hidden;
  padding-bottom: 0.1em;
  margin-bottom: -0.1em;
  vertical-align: top;
}
.word-mask > span {
  display: inline-block;
  transform: translateY(105%) rotate(4deg);
  transform-origin: left bottom;
  transition: transform 1.3s var(--ease-out);
}
.about.in-view .word-mask > span { transform: none; }
.about.in-view .word-mask:nth-child(2) > span { transition-delay: 0.1s; }
.about.in-view .word-mask:nth-child(3) > span { transition-delay: 0.2s; }

/* Lead paragraph — words brighten with scroll progress */
.about__lead {
  max-width: 36ch;
  margin: clamp(1.75rem, 3vw, 2.75rem) 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.3rem, 1.7vw, 1.8rem);
  line-height: 1.38;
  letter-spacing: -0.005em;
  text-wrap: pretty;
}
.about__lead .w {
  opacity: 0.2;
  transition: opacity 0.35s ease;
}
.about__lead .w.is-lit { opacity: 1; }

/* Secondary block — offset to the right, arrives late in the scene */
.about__detail {
  display: grid;
  gap: 1.5rem;
  max-width: 36rem;
  margin: clamp(1.75rem, 3vw, 2.5rem) 0 0 clamp(0rem, 7vw, 7rem);
  padding-top: clamp(1.25rem, 2vw, 1.75rem);
  border-top: 1px solid var(--line);
}
.about__body {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--silver-dim);
}

.about__sectors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.about__sectors li {
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--line);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver);
  transition: background-color 0.4s ease, border-color 0.4s ease, color 0.4s ease;
}
.about__sectors li:hover {
  background: var(--silver);
  border-color: var(--silver);
  color: var(--navy-deep);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  justify-self: start;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.text-link span {
  background: linear-gradient(currentColor, currentColor) left bottom / 0% 1px no-repeat;
  padding-bottom: 4px;
  transition: background-size 0.6s var(--ease-out);
}
.text-link svg { transition: transform 0.6s var(--ease-out); }
.text-link:hover span,
.text-link:focus-visible span { background-size: 100% 1px; }
.text-link:hover svg,
.text-link:focus-visible svg { transform: translateX(8px); }

.reveal-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}
.about.in-view .eyebrow.reveal-up { opacity: 1; transform: none; }
.about.is-late .about__detail .reveal-up { opacity: 1; transform: none; }
.about.is-late .about__detail .reveal-up:nth-child(2) { transition-delay: 0.12s; }
.about.is-late .about__detail .reveal-up:nth-child(3) { transition-delay: 0.24s; }
.about__detail { transition: border-color 1s ease; border-top-color: transparent; }
.about.is-late .about__detail { border-top-color: var(--line); }

/* ==========================================================================
   Tower elevation
   ========================================================================== */
.about__visual {
  position: relative;
  margin: 0;
  min-width: 0;
  height: min(66vh, 620px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.tower {
  position: relative;
  flex: 1;
  min-height: 0;
}
.tower__svg {
  width: 100%;
  height: 100%;
  max-width: none;
  overflow: visible;
}
.tower__svg .t-line {
  fill: none;
  stroke: var(--steel);
  stroke-width: 1;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}
.tower__svg .t-slab { stroke: var(--silver); stroke-width: 1.4; }
.tower__svg .t-mullion { stroke-opacity: 0.45; }
.tower__svg .t-ground { stroke: var(--silver); stroke-width: 1.2; }
.tower__svg .t-hatch { stroke-opacity: 0.35; }
.tower__svg .t-dim { stroke-opacity: 0.6; }
.tower__svg .t-glass {
  fill: var(--steel);
  opacity: 0;
  transition: opacity 0.8s ease;
}
.tower__svg .t-glass.is-on { opacity: 0.07; }
.tower__svg .t-tag {
  fill: var(--silver-dim);
  font-family: var(--font-ui);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  opacity: 0;
  transition: opacity 0.6s ease;
}
.tower__svg .t-tag.is-on { opacity: 1; }
.tower__svg .t-beacon {
  fill: var(--white);
  opacity: 0;
  transition: opacity 0.6s ease;
}
.tower__svg .t-beacon.is-on {
  opacity: 1;
  animation: beacon 2.4s ease-in-out infinite;
}
@keyframes beacon {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.tower__readout {
  display: grid;
  gap: 0.35rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}
.tower__label,
.tower__floor {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver-dim);
}
.tower__value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.2vw, 3rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
}
.tower__value small {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--silver-dim);
}

/* ==========================================================================
   Section edge — one diagonal, low on the left and high on the right.
   js/about.js redraws the path itself on scroll (no stretching), so the
   hairline stays one solid line while the diagonal levels out.
   ========================================================================== */
.edge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(100% - 1px);
  z-index: 2;
  height: clamp(56px, 9.5vw, 190px);
  pointer-events: none;
}
.edge svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  overflow: visible;
}
.edge__shape path { fill: var(--ink); }
.edge__line path {
  fill: none;
  stroke: rgba(227, 231, 237, 0.7);
  stroke-width: 1.25;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  shape-rendering: geometricPrecision;
}
/* hairline draws left to right once the preloader lifts */
.edge__line {
  clip-path: inset(-6px 100% -6px 0);
  transition: clip-path 1.8s cubic-bezier(0.65, 0, 0.35, 1) 1.1s;
}
.is-ready .edge__line { clip-path: inset(-6px 0 -6px 0); }

@media (prefers-reduced-motion: reduce) {
  .edge__line { clip-path: none; }
}

/* Shorter desktop screens: keep the whole scene inside the pinned frame */
@media (min-width: 1024px) and (max-height: 860px) {
  .about__inner { padding-top: calc(100px + 1rem); }
  .about__title { font-size: clamp(3rem, 5.4vw, 5.25rem); }
  .about__lead { font-size: clamp(1.2rem, 1.45vw, 1.45rem); margin-top: 1.5rem; }
  .about__detail { margin-top: 1.5rem; gap: 1.1rem; padding-top: 1.1rem; }
  .about__body { font-size: 0.9375rem; line-height: 1.65; }
  .eyebrow { margin-bottom: 1.25rem; }
  .about__visual { height: min(62vh, 520px); }
}

/* ==========================================================================
   Responsive — no pinning on smaller screens; scene plays as it passes
   ========================================================================== */
@media (max-width: 1023px) {
  .about { height: auto; }
  .about__pin {
    position: relative;
    height: auto;
    display: block;
  }
  .about__inner {
    grid-template-columns: 1fr;
    gap: 3.5rem;
    padding: clamp(5rem, 14vw, 7rem) 1.25rem clamp(4rem, 12vw, 6rem);
  }
  .about__detail { margin-left: 0; }
  .about__visual { height: min(78vh, 560px); }
}

@media (max-width: 560px) {
  .about__title { font-size: clamp(3rem, 15vw, 4.25rem); }
  .about__lead { font-size: 1.3rem; }
  .about__visual { height: 480px; }
}

/* ==========================================================================
   Reduced motion — show the finished scene
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .about { height: auto; }
  .about__pin { position: relative; height: auto; }
  .about__grid { opacity: 1; transform: none; }
  .eyebrow__rule,
  .word-mask > span,
  .reveal-up { opacity: 1; transform: none; }
  .about__lead .w { opacity: 1; }
  .about__detail { border-top-color: var(--line); }
}