/* Progressive enhancement layer for the Perihelion studio experience. */

:root {
  --pointer-x: 50vw;
  --pointer-y: 50vh;
  --scroll-progress: 0;
  --ambient-accent: 255, 92, 33;
}

body.enhanced {
  background:
    radial-gradient(900px circle at var(--pointer-x) var(--pointer-y), rgba(var(--ambient-accent), .055), transparent 42%),
    var(--bg);
}

body.enhanced::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
  opacity: .17;
  mix-blend-mode: soft-light;
  background-image:
    repeating-radial-gradient(circle at 17% 29%, rgba(255,255,255,.12) 0 1px, transparent 1px 3px),
    repeating-radial-gradient(circle at 79% 71%, rgba(255,255,255,.08) 0 1px, transparent 1px 4px);
  background-size: 9px 11px, 13px 15px;
}

.experience-progress {
  position: fixed;
  z-index: 80;
  right: 0;
  top: 0;
  width: 2px;
  height: calc(var(--scroll-progress) * 100%);
  background: linear-gradient(to bottom, var(--sun), var(--solar));
  box-shadow: 0 0 18px rgba(255,92,33,.35);
  pointer-events: none;
}

.experience-orbit {
  position: fixed;
  z-index: 48;
  width: 38px;
  height: 38px;
  margin: -19px 0 0 -19px;
  left: var(--pointer-x);
  top: var(--pointer-y);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  opacity: 0;
  transform: scale(.7);
  transition: opacity .22s ease, transform .22s ease, border-color .22s ease;
  pointer-events: none;
}

.experience-orbit::before,
.experience-orbit::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}

.experience-orbit::before {
  width: 4px;
  height: 4px;
  left: -2px;
  top: 16px;
  background: var(--sun);
  box-shadow: 0 0 12px rgba(255,196,77,.7);
}

.experience-orbit::after {
  inset: 7px;
  border: 1px solid rgba(255,255,255,.08);
}

body.pointer-active .experience-orbit {
  opacity: 1;
  transform: scale(1);
}

body.pointer-over-link .experience-orbit {
  transform: scale(1.45);
  border-color: rgba(255,196,77,.5);
}

.hero-visual,
.project-art,
.method-orbit,
.case-visual {
  transform-style: preserve-3d;
  will-change: transform;
}

.enhanced .project-link {
  position: relative;
  isolation: isolate;
}

.enhanced .project-art {
  transition: transform .55s cubic-bezier(.2,.7,.2,1), border-color .35s ease, filter .35s ease;
}

.enhanced .project-link:hover .project-art,
.enhanced .project-link:focus-visible .project-art {
  border-color: rgba(255,255,255,.18);
  filter: saturate(1.08) contrast(1.03);
}

.project-scan {
  position: absolute;
  z-index: 8;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(to bottom, transparent 0 47%, rgba(255,255,255,.1) 49.5%, rgba(255,196,77,.18) 50%, transparent 52%);
  transform: translateY(-105%);
  opacity: 0;
}

.project-link:hover .project-scan,
.project-link:focus-visible .project-scan {
  animation: project-scan 1.25s cubic-bezier(.2,.7,.2,1) both;
}

@keyframes project-scan {
  0% { transform: translateY(-105%); opacity: 0; }
  18% { opacity: .55; }
  100% { transform: translateY(105%); opacity: 0; }
}

.project-art .project-status {
  position: absolute;
  z-index: 9;
  right: .9rem;
  top: .9rem;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .45rem .55rem;
  border: 1px solid rgba(255,255,255,.1);
  background: rgba(10,10,10,.38);
  backdrop-filter: blur(10px);
  font: 500 .53rem/1 var(--sans);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.64);
}

.project-art .project-status::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--sun);
  box-shadow: 0 0 10px rgba(255,196,77,.55);
}

.evidence {
  position: relative;
  padding-top: clamp(5rem, 9vw, 9rem);
  padding-bottom: clamp(5rem, 10vw, 10rem);
  border-top: 1px solid var(--line);
}

.evidence::before {
  content: "";
  position: absolute;
  inset: 0 var(--pad) auto;
  height: 1px;
  background: linear-gradient(90deg, var(--solar), transparent 22%);
  opacity: .65;
}

.evidence-heading {
  display: grid;
  grid-template-columns: .72fr 1.28fr;
  gap: clamp(2rem, 7vw, 8rem);
  margin-bottom: clamp(3rem, 6vw, 5.5rem);
}

.evidence-heading h2 {
  margin: 0;
  max-width: 880px;
  font-family: var(--display);
  font-size: clamp(3.2rem, 6.5vw, 6.7rem);
  line-height: .9;
  font-weight: 400;
  letter-spacing: -.055em;
}

.evidence-heading-copy {
  align-self: end;
  max-width: 560px;
}

.evidence-heading-copy p {
  margin: 0;
  color: #aaa49a;
  font-size: 1.03rem;
  line-height: 1.55;
}

.evidence-index {
  border-top: 1px solid var(--line);
}

.evidence-row {
  position: relative;
  display: grid;
  grid-template-columns: 68px minmax(150px,.72fr) 1fr 1fr;
  gap: clamp(1rem, 3vw, 3.8rem);
  padding: clamp(1.4rem, 2.5vw, 2.15rem) 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  overflow: hidden;
}

.evidence-row::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(255,92,33,.075), transparent 42%);
  transform: translateX(-105%);
  transition: transform .55s cubic-bezier(.2,.7,.2,1);
}

.evidence-row:hover::before,
.evidence-row:focus-within::before {
  transform: translateX(0);
}

.evidence-no {
  color: var(--solar);
  font: .64rem/1.4 monospace;
}

.evidence-project h3 {
  margin: -.2rem 0 .45rem;
  font-family: var(--display);
  font-size: clamp(1.65rem, 2.7vw, 2.7rem);
  font-weight: 400;
  letter-spacing: -.035em;
}

.evidence-project a {
  display: inline-flex;
  gap: .35rem;
  color: #88827a;
  font-size: .62rem;
  text-transform: uppercase;
  letter-spacing: .1em;
}

.evidence-cell span {
  display: block;
  margin-bottom: .45rem;
  color: #77716a;
  font-size: .55rem;
  text-transform: uppercase;
  letter-spacing: .13em;
}

.evidence-cell p {
  margin: 0;
  max-width: 460px;
  color: #bcb6ad;
  line-height: 1.52;
}

.evidence-pulse {
  display: inline-grid;
  grid-template-columns: repeat(9, 5px);
  gap: 4px;
  margin-top: .85rem;
}

.evidence-pulse i {
  display: block;
  width: 5px;
  height: var(--pulse, 8px);
  align-self: end;
  background: rgba(255,255,255,.15);
  transition: height .3s ease, background .3s ease;
}

.evidence-row:hover .evidence-pulse i:nth-child(3n+1) { height: 18px; background: rgba(255,92,33,.65); }
.evidence-row:hover .evidence-pulse i:nth-child(3n+2) { height: 11px; background: rgba(255,196,77,.5); }
.evidence-row:hover .evidence-pulse i:nth-child(3n) { height: 6px; }

.brief-lab {
  position: relative;
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  min-height: 650px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.brief-lab-copy {
  padding: clamp(5rem, 8vw, 8rem) clamp(2rem, 5vw, 5rem) clamp(5rem, 8vw, 8rem) 0;
  border-right: 1px solid var(--line);
}

.brief-lab-copy h2 {
  margin: 0 0 1.5rem;
  max-width: 660px;
  font-family: var(--display);
  font-size: clamp(3.1rem, 5.6vw, 5.9rem);
  line-height: .92;
  font-weight: 400;
  letter-spacing: -.05em;
}

.brief-lab-copy > p:not(.eyebrow) {
  margin: 0;
  max-width: 490px;
  color: #9f9991;
  line-height: 1.55;
}

.brief-lab-console {
  position: relative;
  display: grid;
  align-content: center;
  padding: clamp(3rem, 6vw, 6rem);
  background:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
    #0d0d0d;
  background-size: 28px 28px;
}

.brief-lab-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-bottom: 2rem;
}

.brief-tab {
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 999px;
  background: rgba(255,255,255,.025);
  color: #a7a198;
  padding: .68rem .88rem;
  cursor: pointer;
  font-size: .67rem;
  text-transform: uppercase;
  letter-spacing: .09em;
  transition: border-color .2s ease, background .2s ease, color .2s ease, transform .2s ease;
}

.brief-tab:hover,
.brief-tab[aria-selected="true"] {
  color: var(--paper);
  border-color: rgba(255,196,77,.5);
  background: rgba(255,196,77,.06);
  transform: translateY(-1px);
}

.brief-readout {
  min-height: 285px;
  display: grid;
  align-content: center;
}

.brief-readout-label {
  margin: 0 0 1rem;
  color: var(--solar);
  font: .62rem monospace;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.brief-readout h3 {
  margin: 0 0 1.3rem;
  max-width: 720px;
  font-family: var(--display);
  font-size: clamp(2.4rem, 4vw, 4.4rem);
  line-height: .98;
  font-weight: 400;
  letter-spacing: -.04em;
}

.brief-readout p {
  margin: 0;
  max-width: 640px;
  color: #aaa49a;
  line-height: 1.55;
}

.brief-signal {
  position: absolute;
  right: clamp(1.2rem, 3vw, 2.4rem);
  bottom: clamp(1.2rem, 3vw, 2.4rem);
  width: min(210px, 28%);
  height: 38px;
  display: flex;
  gap: 4px;
  align-items: end;
  opacity: .55;
}

.brief-signal i {
  flex: 1;
  min-width: 2px;
  height: calc((var(--bar) + 2) * 3px);
  background: linear-gradient(to top, rgba(255,92,33,.3), rgba(255,196,77,.78));
  transform-origin: bottom;
  animation: signal-drift 2.8s ease-in-out infinite alternate;
  animation-delay: calc(var(--bar) * -80ms);
}

@keyframes signal-drift {
  to { transform: scaleY(.45); opacity: .45; }
}

.page-transition {
  position: fixed;
  z-index: 200;
  inset: 0;
  display: grid;
  place-items: center;
  background: #090909;
  transform: translateY(101%);
  pointer-events: none;
  transition: transform .48s cubic-bezier(.76,0,.24,1);
}

.page-transition::before {
  content: "PERIHELION";
  color: rgba(255,255,255,.34);
  font-size: .6rem;
  letter-spacing: .24em;
}

body.leaving .page-transition { transform: translateY(0); }

.case-study-page.enhanced main { position: relative; }

.case-study-rail {
  position: fixed;
  z-index: 35;
  left: max(.55rem, calc((100vw - var(--max)) / 2 - 2.4rem));
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  gap: .45rem;
}

.case-study-rail a {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(255,255,255,.18);
  overflow: hidden;
  text-indent: 999px;
  transition: transform .2s ease, background .2s ease;
}

.case-study-rail a.active {
  transform: scale(1.8);
  background: var(--sun);
}

@media (hover: none), (pointer: coarse) {
  .experience-orbit { display: none; }
  body.enhanced { background: var(--bg); }
}

@media (max-width: 900px) {
  .evidence-heading,
  .brief-lab {
    grid-template-columns: 1fr;
  }

  .evidence-heading { gap: 1.7rem; }
  .evidence-row { grid-template-columns: 44px 1fr 1fr; }
  .evidence-project { grid-column: 2 / -1; }
  .evidence-cell:nth-of-type(2) { grid-column: 2; }
  .brief-lab-copy { border-right: 0; border-bottom: 1px solid var(--line); padding-right: 0; }
  .brief-lab-console { min-height: 520px; padding-inline: var(--pad); }
  .case-study-rail { display: none; }
}

@media (max-width: 620px) {
  .evidence-row { grid-template-columns: 34px 1fr; gap: .8rem 1rem; }
  .evidence-project,
  .evidence-cell,
  .evidence-cell:nth-of-type(2) { grid-column: 2; }
  .evidence-cell { padding-top: .6rem; }
  .brief-lab { margin-inline: calc(var(--pad) * -1); padding-inline: var(--pad); }
  .brief-lab-copy { padding-left: var(--pad); padding-right: var(--pad); margin-inline: calc(var(--pad) * -1); }
  .brief-lab-console { margin-inline: calc(var(--pad) * -1); }
  .brief-signal { width: 38%; }
}

@media (prefers-reduced-motion: reduce) {
  .project-link:hover .project-scan,
  .project-link:focus-visible .project-scan,
  .brief-signal i { animation: none !important; }
  .page-transition { display: none; }
  .experience-orbit { display: none; }
}