:root {
  --research-accent: #2d6cdf;
  --research-ink: #172033;
  --research-muted: #657184;
  --research-line: rgba(101, 113, 132, 0.18);
  --research-card: rgba(255, 255, 255, 0.84);
  --research-shadow: 0 18px 45px rgba(24, 35, 56, 0.10);
}

html {
  scroll-behavior: smooth;
}

body.research-polished {
  background:
    radial-gradient(circle at 12% 8%, color-mix(in srgb, var(--research-accent) 8%, transparent), transparent 28rem),
    radial-gradient(circle at 88% 18%, rgba(39, 116, 191, 0.07), transparent 30rem),
    #fff;
}

.research-progress {
  position: fixed;
  z-index: 1000;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--research-accent), #2f80ed);
  transform: scaleX(0);
  transform-origin: left center;
  box-shadow: 0 0 14px color-mix(in srgb, var(--research-accent) 45%, transparent);
}

.research-contents {
  position: fixed;
  z-index: 90;
  left: max(1rem, calc(50vw - 690px));
  top: 6.1rem;
  width: 178px;
  padding: 0.75rem;
  border: 1px solid var(--research-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 10px 30px rgba(24, 35, 56, 0.08);
  backdrop-filter: blur(16px);
}

.research-contents-title {
  padding: 0.2rem 0.45rem 0.55rem;
  font-family: "Google Sans", sans-serif;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--research-muted);
}

.research-contents-link {
  display: block;
  width: 100%;
  margin: 0.08rem 0;
  padding: 0.42rem 0.55rem;
  border: 0;
  border-left: 3px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: #3a4352;
  cursor: pointer;
  font: 700 0.82rem/1.25 "Google Sans", sans-serif;
  text-align: left;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.research-contents-link:hover,
.research-contents-link.active {
  color: var(--research-accent);
  background: color-mix(in srgb, var(--research-accent) 10%, transparent);
  border-left-color: var(--research-accent);
  transform: translateX(2px);
}

.research-polished .section {
  position: relative;
}

.research-polished .sec-heading {
  position: relative;
  display: table;
  margin-left: auto;
  margin-right: auto;
}

.research-polished .sec-heading::after {
  content: "";
  display: block;
  width: 54px;
  height: 3px;
  margin: 0.55rem auto 0;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--research-accent), transparent);
}

.research-polished .hero {
  position: relative;
  overflow: hidden;
}

.research-polished .hero::before {
  content: "";
  position: absolute;
  inset: auto -14vw -18rem -14vw;
  height: 26rem;
  pointer-events: none;
  background: radial-gradient(ellipse at center, color-mix(in srgb, var(--research-accent) 9%, transparent), transparent 65%);
}

.research-polished .publication-video-block,
.research-polished .survey-hero-card,
.research-polished .fig-wrap,
.research-polished .chart-card,
.research-polished .fmp-chart-wrap,
.research-polished .realworld-chart-card,
.research-polished .method-visual-card,
.research-polished .taxonomy-card,
.research-polished .module-card,
.research-polished .paper-browser,
.research-polished .highlight-shell,
.research-polished .fmp-highlight-shell {
  border-color: color-mix(in srgb, var(--research-accent) 17%, #dfe5ee);
  box-shadow: var(--research-shadow);
}

.research-polished .highlight-card,
.research-polished .method-step,
.research-polished .mini-figure {
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.research-polished .highlight-card:hover,
.research-polished .method-step:hover,
.research-polished .mini-figure:hover,
.research-polished .chart-card:hover,
.research-polished .fmp-chart-wrap:hover,
.research-polished .fig-wrap:hover,
.research-polished .module-card:hover,
.research-polished .taxonomy-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--research-accent) 32%, #dfe5ee);
  box-shadow: 0 22px 52px rgba(24, 35, 56, 0.14);
}

.research-polished .highlight-icon {
  filter: drop-shadow(0 7px 12px color-mix(in srgb, var(--research-accent) 16%, transparent));
}

.research-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.research-reveal.research-visible {
  opacity: 1;
  transform: none;
}

.research-clickable-media {
  cursor: zoom-in;
}

.research-lightbox {
  position: fixed;
  z-index: 1200;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: rgba(10, 14, 22, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.research-lightbox.open {
  opacity: 1;
  pointer-events: auto;
}

.research-lightbox img {
  max-width: min(1100px, 94vw);
  max-height: 88vh;
  object-fit: contain;
  border-radius: 14px;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.4);
  background: #fff;
}

.research-lightbox-close,
.research-top {
  border: 0;
  cursor: pointer;
  font-family: "Google Sans", sans-serif;
  box-shadow: 0 12px 28px rgba(24, 35, 56, 0.18);
}

.research-lightbox-close {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  background: #fff;
  color: var(--research-ink);
  font-size: 1.45rem;
  line-height: 1;
}

.research-top {
  position: fixed;
  z-index: 950;
  right: 1.2rem;
  bottom: 1.2rem;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  color: #fff;
  background: var(--research-accent);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.research-top.visible {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

@media (max-width: 1180px) {
  .research-contents {
    display: none;
  }
}

@media (max-width: 760px) {
  .research-lightbox {
    padding: 1rem;
  }
  .research-top {
    right: 0.8rem;
    bottom: 0.8rem;
  }
}