/* Shared editorial polish: spacing, interaction feedback, and image viewing. */
:root {
  --motion-fast: 180ms;
  --motion-standard: 280ms;
  --motion-reveal: 560ms;
  --motion-page: 500ms;
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-page: cubic-bezier(.45, 0, .2, 1);
  --focus-ring: #b5502e;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --ink: #f1f0ec;
  --muted: #b4b7c0;
  --line: #363a43;
  --bg: #1a1d24;
  --paper: #1a1d24;
  --soft: #20242c;
  --card: #22262f;
  --quote-bg: #22262f;
  --accent: #d08a70;
  color-scheme: dark;
}

body,
main section,
.about-hero,
.card,
.footer-button {
  transition: background-color var(--motion-standard) ease, color var(--motion-standard) ease,
    border-color var(--motion-standard) ease;
}

/* Dark heroes remain the visual anchor; the body stays distinct but deliberately nearby. */
:root[data-theme="dark"] :is(header.hero, .site-header, .hero, .takeaway) {
  background-color: var(--night, #12141a);
}

:root[data-theme="dark"] .footer-button {
  background: var(--card);
}

:root[data-theme="dark"] :is(.product-frame, .hero-showcase) {
  background: #20242c;
}

/* Keep the release-strategy image untouched while darkening its text surfaces. */
:root[data-theme="dark"] .release-artifact .scope-card,
:root[data-theme="dark"] .release-artifact figcaption {
  background: rgba(34, 38, 47, .96);
}

.theme-toggle {
  position: relative;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  margin: -5px 0;
  padding: 0;
  border: 1px solid rgba(174, 179, 191, .42);
  border-radius: 50%;
  background: transparent;
  color: #d7dae0;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: rgba(255, 255, 255, .82);
  background: rgba(255, 255, 255, .08);
  color: #fff;
  transform: translateY(-1px);
}

.theme-icon {
  position: absolute;
  inset: 6px;
  display: grid;
  place-items: center;
  transition: opacity var(--motion-standard) ease,
    transform 420ms var(--ease-out);
}

.theme-icon svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.theme-icon-sun { opacity: 0; transform: rotate(-70deg) scale(.65); }
.theme-icon-moon { opacity: 1; transform: rotate(0) scale(1); }
:root[data-theme="dark"] .theme-icon-sun { opacity: 1; transform: rotate(0) scale(1); }
:root[data-theme="dark"] .theme-icon-moon { opacity: 0; transform: rotate(70deg) scale(.65); }

/* Cross-document transitions. The early head script supplies the no-flash entry state. */
html {
  background: var(--night, #12141a);
}

.page-entry-pending body {
  opacity: 0;
}

.page-entry-active body {
  transition: opacity var(--motion-page) ease;
}

body.is-page-exiting {
  opacity: 0;
  transition: opacity var(--motion-page) ease;
  pointer-events: none;
}

/* The password page uses the same quiet fade as the rest of the site. */
.access-entry-pending body {
  opacity: 0;
}

.access-entry-active body {
  transition: opacity var(--motion-page) ease;
}

/* Unlock handoff: the access page converges on a horizon; the case study opens from it. */
.unlock-horizon {
  position: fixed;
  inset: 0;
  z-index: 1000;
  overflow: hidden;
  pointer-events: none;
  visibility: hidden;
}

.unlock-horizon::before {
  content: "";
  position: absolute;
  top: var(--unlock-y, 50%);
  left: 0;
  width: 100vw;
  height: 1px;
  background: rgba(255,255,255,.72);
  opacity: 0;
  transform: translateY(-50%) scaleX(0);
  transform-origin: var(--unlock-x, 50%) center;
}

.is-horizon-launching .unlock-horizon { visibility: visible; }
.is-horizon-launching .page-transition-surface {
  opacity: 0;
  transform: translateY(-2vh) scale(.975);
  transition: opacity 540ms ease-in, transform 700ms cubic-bezier(.55, 0, .8, .25);
}
.is-horizon-launching .unlock-horizon::before {
  opacity: 1;
  transform: translateY(-50%) scaleX(1);
  transition: transform 620ms var(--ease-out) 40ms, opacity 180ms ease 40ms;
}

.case-study-horizon-pending body { overflow: hidden; }
.case-study-horizon-pending .hero {
  opacity: 0;
  transform: scale(1.025);
}
.case-study-horizon-pending::before,
.case-study-horizon-pending::after,
.case-study-horizon-active::before,
.case-study-horizon-active::after {
  content: "";
  position: fixed;
  left: 0;
  z-index: 9999;
  width: 100%;
  height: calc(50% + 1px);
  background: #12141a;
  pointer-events: none;
  transform: scaleY(1);
}
.case-study-horizon-pending::before,
.case-study-horizon-active::before { top: 0; transform-origin: top; }
.case-study-horizon-pending::after,
.case-study-horizon-active::after { bottom: 0; transform-origin: bottom; }
.case-study-horizon-active::before,
.case-study-horizon-active::after {
  transition: transform 980ms cubic-bezier(.76, 0, .24, 1) 100ms;
}
.case-study-horizon-active:not(.case-study-horizon-pending)::before,
.case-study-horizon-active:not(.case-study-horizon-pending)::after { transform: scaleY(0); }
.case-study-horizon-active .hero {
  transition: opacity 760ms ease 230ms, transform 1050ms var(--ease-out) 100ms;
}
.case-study-horizon-active:not(.case-study-horizon-pending) .hero {
  opacity: 1;
  transform: none;
}

/* Keep the story on one continuous canvas; hierarchy comes from rhythm. */
main section:not(.takeaway) {
  background: var(--paper, var(--bg, #faf9f6));
}

main section.soft:not(.takeaway) {
  background: var(--paper, var(--bg, #faf9f6)) !important;
}

@media (min-width: 761px) {
  main section:not(.takeaway) {
    padding-block: clamp(112px, 9vw, 144px);
  }
}

main section > .wrap > :is(figure, .visual, .product-frame, .evidence-grid, .version-grid, .rule-gallery, .phase-visuals, .grid2, .grid3, .band, .studies, .foundation, .context-stack) {
  margin-top: clamp(42px, 5vw, 64px);
}

a,
button,
summary {
  transition: color var(--motion-fast) ease, background-color var(--motion-fast) ease,
    border-color var(--motion-fast) ease, transform var(--motion-fast) var(--ease-out);
}

:is(a, button, summary):focus-visible,
.expandable-image:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 5px;
}

.navlinks a {
  position: relative;
}

.navlinks a::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 1px;
  background: currentColor;
  content: "";
  opacity: .7;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--motion-standard) var(--ease-out);
}

.navlinks a:hover::after,
.navlinks a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.expandable-image {
  cursor: zoom-in;
  transform: translateZ(0) scale(1);
  transition: transform var(--motion-standard) var(--ease-out),
    filter var(--motion-standard) ease;
}

.expandable-image:hover,
.expandable-image:focus-visible {
  filter: brightness(.985);
  transform: translateZ(0) scale(1.012);
}

.reveal-ready {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--motion-reveal) ease,
    transform var(--motion-reveal) var(--ease-out);
}

.reveal-ready.is-visible {
  opacity: 1;
  transform: translateY(0);
}

body.lightbox-open {
  overflow: hidden;
}

.image-lightbox[hidden] {
  display: none;
}

.image-lightbox {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  padding: clamp(18px, 3vw, 40px);
  background: rgba(10, 11, 14, .94);
  color: #fff;
  opacity: 0;
  transition: opacity var(--motion-standard) ease;
}

.image-lightbox.is-open {
  opacity: 1;
}

.lightbox-toolbar {
  display: flex;
  justify-content: flex-end;
}

.lightbox-close,
.lightbox-nav {
  display: grid;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 50%;
  background: rgba(18, 20, 26, .72);
  color: #fff;
  cursor: pointer;
  font: inherit;
  place-items: center;
}

.lightbox-close {
  font-size: 27px;
  line-height: 1;
}

.lightbox-close:hover,
.lightbox-nav:hover {
  border-color: #fff;
  background: #fff;
  color: #12141a;
}

.lightbox-stage {
  position: relative;
  display: grid;
  min-height: 0;
  align-items: center;
  justify-items: center;
  padding: 14px clamp(0px, 5vw, 70px);
}

.lightbox-image {
  max-width: 100%;
  max-height: 74vh;
  object-fit: contain;
  box-shadow: 0 24px 80px rgba(0, 0, 0, .32);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 25px;
}

.lightbox-prev { left: 0; }
.lightbox-next { right: 0; }

.lightbox-caption {
  width: min(760px, 100%);
  min-height: 28px;
  margin: 14px auto 0;
  color: #cfd2d9;
  font-size: 14px;
  line-height: 1.55;
  text-align: center;
}

@media (max-width: 760px) {
  main section:not(.takeaway) {
    padding-block: 80px;
  }

  .image-lightbox {
    padding: 16px;
  }

  .lightbox-stage {
    padding-inline: 0;
  }

  .lightbox-nav {
    top: auto;
    bottom: 4px;
  }

  .lightbox-image {
    max-height: 70vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  body,
  main section,
  .about-hero,
  .card,
  .footer-button,
  .theme-icon {
    transition: none;
  }
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal-ready {
    opacity: 1;
    transform: none;
  }

  .expandable-image:hover,
  .expandable-image:focus-visible {
    transform: none;
  }

  body.is-page-exiting,
  .page-entry-pending body,
  .access-entry-pending body,
  .access-entry-pending main > *,
  .is-horizon-launching .page-transition-surface,
  .case-study-horizon-pending .hero {
    opacity: 1;
    transform: none;
  }

  .case-study-horizon-pending::before,
  .case-study-horizon-pending::after,
  .unlock-horizon { display: none; }
}