/* =============================================================================
   RESEARCH CINEMA SKIN
   -----------------------------------------------------------------------------
   Applied to /research-articles/ only. `_layouts/default.html` adds
   `spx-cinema` to <body>; `_includes/head.html` loads this file plus the
   Barlow Condensed webfont. Markup lives in _includes/spx-section.html and
   the animated backgrounds in assets/js/research-cinema.js.

   Look: launch-broadcast style — every publication is a full-screen panel
   with a moving background, a bold condensed uppercase headline in the
   bottom-left, one line of copy and a single outlined button.

     black   #000000     off-white rgb(240 240 250) at stepped opacities
     charcoal rgb(37 38 40)

   Scoped body.theme-typesafe.spx-cinema (three classes) so it outranks the
   typesafe theme without !important.
   ========================================================================== */

body.theme-typesafe.spx-cinema {
  --spx-white: rgb(240, 240, 250);
  --spx-white-80: rgba(240, 240, 250, 0.8);
  --spx-white-60: rgba(240, 240, 250, 0.6);
  --spx-white-35: rgba(240, 240, 250, 0.35);
  --spx-white-15: rgba(240, 240, 250, 0.15);
  --spx-charcoal: rgb(37, 38, 40);
  --spx-head: "Barlow Condensed", "Arial Narrow", "Helvetica Neue", Arial,
    sans-serif;

  background: #000;
  color: var(--spx-white);
}

/* The page runs edge to edge; sections handle their own padding. */
body.theme-typesafe.spx-cinema .site-shell {
  width: 100%;
  max-width: none;
  padding: 0;
}

/* -----------------------------------------------------------------------------
   Nav: floats over the hero, solidifies once the page scrolls
   -------------------------------------------------------------------------- */

body.theme-typesafe.spx-cinema .topnav {
  position: fixed;
  left: 0;
  right: 0;
  background: linear-gradient(rgba(0, 0, 0, 0.72), rgba(0, 0, 0, 0));
  border-bottom: 1px solid transparent;
  transition: background-color 0.4s var(--ts-ease), border-color 0.4s var(--ts-ease);
}

body.theme-typesafe.spx-cinema.spx-scrolled .topnav {
  background: rgba(0, 0, 0, 0.92);
  border-bottom-color: var(--spx-white-15);
}

body.theme-typesafe.spx-cinema .topnav-brand,
body.theme-typesafe.spx-cinema .topnav-link {
  font-family: var(--spx-head);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--spx-white);
  border-radius: 0;
}

body.theme-typesafe.spx-cinema.dark-mode .topnav-link.active {
  background: transparent;
  box-shadow: inset 0 -2px 0 var(--spx-white);
}

body.theme-typesafe.spx-cinema.dark-mode .topnav-link:hover {
  background: transparent;
  color: var(--spx-white-60);
}

/* -----------------------------------------------------------------------------
   Full-screen section
   -------------------------------------------------------------------------- */

.spx-cinema .spx-section {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  isolation: isolate;
  padding-top: 10rem; /* fixed nav + group label never overlap the copy */
  box-sizing: border-box;
  background: #000;
  border-top: 1px solid var(--spx-white-15);
}

.spx-cinema .spx-section--hero {
  border-top: 0;
}

.spx-cinema .spx-bg,
.spx-cinema .spx-shade {
  position: absolute;
  inset: 0;
}

.spx-cinema .spx-bg {
  z-index: -2;
}

.spx-cinema .spx-canvas,
.spx-cinema .spx-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* A video sits over the fallback canvas and fades in once it is playing. */
.spx-cinema .spx-video {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s var(--ts-ease);
}

.spx-cinema .spx-section.spx-video-ready .spx-video {
  opacity: 1;
}

/* Darken the bottom-left where the copy sits, like a broadcast lower third. */
.spx-cinema .spx-shade {
  z-index: -1;
  background: linear-gradient(
      to top,
      rgba(0, 0, 0, 0.85) 0%,
      rgba(0, 0, 0, 0.35) 38%,
      rgba(0, 0, 0, 0) 70%
    ),
    linear-gradient(to right, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0) 55%);
}

.spx-cinema .spx-copy {
  width: min(760px, 100%);
  padding: 0 6vw 13vh;
  box-sizing: border-box;
}

.spx-cinema .spx-eyebrow {
  margin: 0 0 0.6rem;
  font-family: var(--ts-term);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--spx-white);
}

.spx-cinema .spx-title {
  margin: 0 0 1.1rem;
  font-family: var(--spx-head);
  font-weight: 700;
  font-size: clamp(2.4rem, 5.6vw, 4.8rem);
  line-height: 0.94;
  letter-spacing: -0.005em;
  text-transform: uppercase;
  color: var(--spx-white);
  -webkit-text-stroke: 0;
  border: 0;
  padding: 0;
}

.spx-cinema .spx-title--long {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.spx-cinema .spx-section--hero .spx-title {
  font-size: clamp(3rem, 8.4vw, 7rem);
}

.spx-cinema .spx-desc {
  max-width: 56ch;
  margin: 0 0 0.9rem;
  font-family: var(--ts-body);
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--spx-white-80);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.spx-cinema .spx-tags {
  margin: 0 0 1.8rem;
  font-family: var(--ts-term);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--spx-white-60);
}

/* -----------------------------------------------------------------------------
   Outlined button: fills white on hover
   -------------------------------------------------------------------------- */

.spx-cinema .spx-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

body.theme-typesafe.spx-cinema .spx-button {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1.05rem 1.4rem;
  border: 1px solid var(--spx-white);
  background: transparent;
  color: var(--spx-white);
  font-family: var(--spx-head);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background-color 0.3s var(--ts-ease), color 0.3s var(--ts-ease);
}

body.theme-typesafe.spx-cinema .spx-button:hover,
body.theme-typesafe.spx-cinema .spx-button:focus-visible {
  background: var(--spx-white);
  color: #000;
}

body.theme-typesafe.spx-cinema .spx-button--ghost {
  border-color: var(--spx-white-35);
}

.spx-cinema .spx-button-arrow {
  transition: transform 0.3s var(--ts-ease);
}

.spx-cinema .spx-button:hover .spx-button-arrow {
  transform: translateX(4px);
}

/* -----------------------------------------------------------------------------
   Group label pinned over the first section of each group, scroll cue
   -------------------------------------------------------------------------- */

.spx-cinema .spx-group {
  position: relative;
}

body.theme-typesafe.spx-cinema .spx-group-label {
  position: absolute;
  z-index: 2;
  top: 6.2rem;
  left: 6vw;
  margin: 0;
  font-family: var(--ts-term);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--spx-white-60);
}

.spx-cinema .spx-group-label span {
  color: var(--spx-white);
  margin-right: 0.6rem;
}

body.theme-typesafe.spx-cinema .spx-scroll-cue {
  position: absolute;
  right: 6vw;
  bottom: 13vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  font-family: var(--ts-term);
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--spx-white-60);
  text-decoration: none;
}

.spx-cinema .spx-scroll-cue::after {
  content: "";
  width: 1px;
  height: 56px;
  background: linear-gradient(var(--spx-white), transparent);
  animation: spx-cue 2.2s var(--ts-ease) infinite;
  transform-origin: top;
}

@keyframes spx-cue {
  0% { transform: scaleY(0); opacity: 1; }
  70% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(1); opacity: 0; }
}

.spx-cinema .spx-empty {
  padding: 4rem 6vw;
  color: var(--spx-white-60);
}

/* -----------------------------------------------------------------------------
   Copy rises in as each section enters (class set by research-cinema.js)
   -------------------------------------------------------------------------- */

.spx-cinema.spx-js .spx-copy > * {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.9s var(--ts-ease), transform 0.9s var(--ts-ease);
}

.spx-cinema.spx-js .spx-section.spx-in .spx-copy > * {
  opacity: 1;
  transform: none;
}

.spx-cinema.spx-js .spx-section.spx-in .spx-copy > :nth-child(2) { transition-delay: 0.08s; }
.spx-cinema.spx-js .spx-section.spx-in .spx-copy > :nth-child(3) { transition-delay: 0.16s; }
.spx-cinema.spx-js .spx-section.spx-in .spx-copy > :nth-child(4) { transition-delay: 0.24s; }
.spx-cinema.spx-js .spx-section.spx-in .spx-copy > :nth-child(5) { transition-delay: 0.32s; }

@media (max-width: 760px) {
  .spx-cinema .spx-copy {
    padding-bottom: 10vh;
  }
  .spx-cinema .spx-scroll-cue {
    display: none;
  }
  body.theme-typesafe.spx-cinema .spx-group-label {
    top: 5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .spx-cinema.spx-js .spx-copy > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .spx-cinema .spx-scroll-cue::after {
    animation: none;
  }
}