/* ==========================================================================
   cNF Volume Estimation - project page
   Built on the Nerfies academic project-page template (Bulma).
   Visual language borrows the clean, restrained look of the Nerfies and
   3D Gaussian Splatting project pages: white canvas, dark type, one blue
   link accent, soft gray panels.
   ========================================================================== */

:root {
  --accent: hsl(204, 86%, 45%);
  --accent-soft: hsl(204, 86%, 53%);
  --ink: #1f2429;
  --muted: #5b6168;
  --line: #e6e8eb;
  --panel: #f5f5f7;
  --panel-line: #e3e5e8;
  --site-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  font-family: var(--site-font);
  color: var(--ink);
}

button,
input,
select,
textarea {
  font-family: var(--site-font);
}

section[data-spy] {
  scroll-margin-top: 88px;
}

/* ---- Typography ---------------------------------------------------------- */

.publication-title {
  font-family: var(--site-font);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.1;
}

.publication-subtitle {
  font-family: var(--site-font);
  color: var(--muted);
  font-weight: 400;
}

.publication-authors {
  font-family: var(--site-font);
}

.publication-authors a,
.publication-authors a:visited {
  color: var(--accent-soft) !important;
}

.publication-authors a:hover {
  text-decoration: underline;
}

.author-block {
  display: inline-block;
}

.author-note {
  color: var(--muted);
  font-size: 0.95rem;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.35em 0.9em;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--accent);
  font-family: var(--site-font);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-kicker {
  margin-bottom: 0.4rem;
  color: var(--accent);
  font-family: var(--site-font);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.title.is-3,
.title.is-4 {
  font-family: var(--site-font);
  letter-spacing: -0.01em;
}

.paper-copy {
  max-width: 840px;
  margin: 1.3rem auto 0;
}

.paper-copy p {
  color: #333941;
  font-size: 1.04rem;
  line-height: 1.78;
}

/* ---- Navbar -------------------------------------------------------------- */

.navbar {
  border-bottom: 1px solid var(--line);
  box-shadow: none;
}

.navbar-brand .navbar-item {
  gap: 0.58rem;
  font-family: var(--site-font);
  font-weight: 700;
}

.navbar-brand .home-button {
  margin-right: 0.4rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.navbar-brand .home-button:hover {
  border-color: var(--accent-soft);
  color: var(--accent);
  background: #fff;
}

.home-button-short {
  display: none;
}

.navbar-logo {
  display: block;
  flex: none;
  width: 56px;
  height: 34px;
  object-fit: contain;
  filter: drop-shadow(0 2px 3px rgba(16, 135, 213, 0.18));
}

.navbar-item.is-section-link {
  color: var(--muted);
  font-weight: 600;
}

.navbar-item.is-section-link:hover {
  color: var(--ink);
}

/* ---- Hero / links -------------------------------------------------------- */

.hero.publication-header .hero-body {
  padding-top: 3rem;
  padding-bottom: 2rem;
}

.publication-links {
  margin-top: 1.5rem;
}

.link-block a {
  margin-top: 5px;
  margin-bottom: 5px;
}

.external-link.button {
  font-family: var(--site-font);
  font-weight: 600;
}

/* ---- Teaser / banner ----------------------------------------------------- */

.teaser {
  font-family: var(--site-font);
}

.teaser .hero-body {
  padding-top: 0;
  padding-bottom: 3rem;
}

.publication-banner {
  margin-top: 0;
}

.banner-frame {
  overflow: hidden;
  border: 1px solid var(--panel-line);
  border-radius: 12px;
  background: var(--panel);
}

.banner-frame img {
  display: block;
  width: 100%;
}

.hero-segment-control {
  display: flex;
  justify-content: center;
  margin-top: 1.25rem;
}

.segment-volume-button {
  appearance: none;
  border: 1px solid #b9bdc4;
  border-radius: 999px;
  background: #d4d7dc;
  color: #171b20;
  cursor: pointer;
  font-family: var(--site-font);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0;
  padding: 0.9rem 1.35rem;
  box-shadow: 0 0 0 0 rgba(31, 36, 41, 0.22), 0 14px 28px rgba(31, 36, 41, 0.14);
  animation: segment-pulse 1.55s ease-in-out infinite;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease, filter 160ms ease;
}

.segment-volume-button:hover,
.segment-volume-button:focus-visible {
  background: #c7cbd1;
  border-color: #9fa5ad;
  transform: translateY(-1px);
  outline: none;
  box-shadow: 0 0 0 10px rgba(31, 36, 41, 0.08), 0 16px 32px rgba(31, 36, 41, 0.18);
}

.segment-volume-button.is-segmented {
  animation: none;
  background: #5d636b;
  border-color: #5d636b;
  color: #fff;
}

@keyframes segment-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(31, 36, 41, 0.22), 0 14px 28px rgba(31, 36, 41, 0.14);
  }
  55% {
    box-shadow: 0 0 0 12px rgba(31, 36, 41, 0), 0 16px 32px rgba(31, 36, 41, 0.16);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(31, 36, 41, 0), 0 14px 28px rgba(31, 36, 41, 0.14);
  }
}

.results-frame {
  max-width: 720px;
  margin: 1.5rem auto 0;
}

/* ---- Slide-driven sections ---------------------------------------------- */

.subhead {
  font-family: var(--site-font);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.copy {
  color: var(--muted);
  font-size: 1.02rem;
}

.method-step .copy + .copy {
  margin-top: 1rem;
}

.ticks {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
}

.ticks li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: 0.5rem;
  color: #2c3138;
}

.ticks li::before {
  content: "\f00c";
  font-family: "Font Awesome 5 Free";
  font-weight: 900;
  position: absolute;
  left: 0;
  top: 0.15rem;
  color: var(--accent);
  font-size: 0.8rem;
}

.slide-figure {
  margin: 1.5rem auto 0;
  max-width: 920px;
  overflow: hidden;
  border: 1px solid var(--panel-line);
  border-radius: 12px;
  background: #fff;
}

.slide-figure a {
  display: block;
  background: var(--panel);
}

.slide-figure img {
  display: block;
  width: 100%;
}

.slide-figure figcaption {
  padding: 0.7rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--line);
}

.method-step {
  max-width: 920px;
  margin: 2.25rem auto 0;
}

.step-pill {
  display: block;
  margin-bottom: 0.35rem;
  padding: 0;
  background: transparent;
  color: var(--accent);
  font-family: var(--site-font);
  font-size: 0.96rem;
  font-weight: 700;
  letter-spacing: 0;
}

/* ---- Section tracker (scroll-spy) --------------------------------------- */

.section-tracker {
  position: fixed;
  left: 28px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 25;
  width: 178px;
  padding: 0.35rem 0;
}

.section-tracker ul {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.section-tracker ul::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0.8rem;
  bottom: 0.8rem;
  width: 1px;
  background: linear-gradient(to bottom, transparent, #cfd6dd 14%, #cfd6dd 86%, transparent);
}

.section-tracker li {
  position: relative;
  margin: 0.28rem 0;
}

.section-tracker a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  min-height: 44px;
  padding: 0.42rem 0 0.42rem 0.05rem;
  border: 0;
  border-radius: 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  line-height: 1.15;
  transition: color 0.2s ease, transform 0.2s ease;
}

.section-tracker .dot {
  flex: none;
  position: relative;
  z-index: 1;
  width: 16px;
  height: 16px;
  border: 4px solid #fff;
  border-radius: 999px;
  background: #c0c7cf;
  box-shadow: 0 0 0 1px rgba(192, 199, 207, 0.5);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.section-tracker .lbl {
  opacity: 0.7;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.section-tracker a:hover {
  color: var(--ink);
  transform: translateX(2px);
}

.section-tracker a:hover .lbl {
  opacity: 1;
  color: var(--ink);
}

.section-tracker a.is-active .lbl {
  opacity: 1;
  color: #0f1720;
  font-weight: 700;
}

.section-tracker a.is-active {
  color: var(--ink);
  transform: translateX(4px);
}

.section-tracker a.is-active .dot {
  background: var(--accent);
  transform: scale(1.28);
  box-shadow:
    0 0 0 6px rgba(16, 135, 213, 0.14),
    0 0 0 1px #fff inset;
}

@media (max-width: 1215px) {
  .section-tracker { display: none; }
}

.teaser .subtitle {
  margin-top: 1.25rem;
  color: var(--muted);
}

/* ---- Fine-tuning results chart ------------------------------------------ */

.finetune-chart {
  max-width: 980px;
  margin: 1.75rem auto 0;
}

.finetune-table-wrap {
  max-width: 900px;
  margin: 1.35rem auto 0;
}

.finetune-table {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  color: #2c3138;
  font-size: 0.92rem;
}

.finetune-table th {
  color: var(--ink);
  font-weight: 700;
}

.finetune-table td:last-child,
.finetune-table th:last-child {
  text-align: right;
  white-space: nowrap;
}

.finetune-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 0.7rem;
}

.finetune-toolbar select {
  min-width: 205px;
  min-height: 36px;
  padding: 0.35rem 2.1rem 0.35rem 0.75rem;
  border: 1px solid #b6c3d4;
  border-radius: 2px;
  background: #fff;
  color: #1e3559;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
}

.finetune-plot-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #e7eef8;
}

.finetune-plot-wrap svg {
  display: block;
  width: 100%;
  height: auto;
  min-height: 420px;
}

.finetune-tooltip {
  position: absolute;
  z-index: 2;
  max-width: 260px;
  padding: 0.55rem 0.7rem;
  border: 1px solid rgba(31, 36, 41, 0.16);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.96);
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.35;
  box-shadow: 0 12px 28px rgba(31, 36, 41, 0.18);
  pointer-events: none;
}

.finetune-tooltip strong {
  display: block;
  margin-bottom: 0.16rem;
}

.finetune-bar-group {
  cursor: pointer;
}

.finetune-bar-hit {
  fill: transparent;
}

.finetune-bar {
  fill: #636efa;
  transition: fill 0.16s ease, opacity 0.16s ease;
}

.finetune-bar-group:hover .finetune-bar,
.finetune-bar-group:focus .finetune-bar {
  fill: #4d58f0;
}

.finetune-bar-group.is-selected .finetune-bar {
  fill: var(--ink);
}

.finetune-plot-bg {
  fill: #e7eef8;
}

.finetune-grid {
  stroke: rgba(69, 91, 122, 0.14);
  stroke-width: 1;
}

.finetune-axis {
  stroke: rgba(30, 53, 89, 0.42);
  stroke-width: 1;
}

.finetune-axis-label,
.finetune-tick,
.finetune-y-label {
  fill: #1e3559;
  font-family: var(--site-font);
  font-weight: 600;
}

.finetune-axis-label {
  font-size: 14px;
}

.finetune-tick {
  font-size: 12px;
}

.finetune-y-label {
  font-size: 12px;
  text-anchor: end;
}

.finetune-bar-label {
  fill: #fff;
  font-family: var(--site-font);
  font-size: 12px;
  font-weight: 700;
  pointer-events: none;
}

.finetune-value-label {
  fill: #1e3559;
  font-family: var(--site-font);
  font-size: 11px;
  font-weight: 700;
  pointer-events: none;
}

/* ---- Section rhythm ------------------------------------------------------ */

.section.alt {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.content.has-text-justified p {
  color: #2c3138;
}

.lead {
  font-size: 1.15rem;
  color: var(--muted);
}

/* ---- Research questions -------------------------------------------------- */

.question-card {
  height: 100%;
  padding: 1.6rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: #fff;
}

.question-card .q-index {
  display: block;
  margin-bottom: 0.6rem;
  color: var(--accent);
  font-family: var(--site-font);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.question-card p {
  margin: 0;
  font-size: 1.05rem;
}

/* ---- Method / pipeline steps -------------------------------------------- */

.step-card {
  height: 100%;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.step-card .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: 1rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-family: var(--site-font);
  font-weight: 700;
}

.step-card h3 {
  margin-bottom: 0.5rem;
  font-family: var(--site-font);
  font-size: 1.1rem;
  font-weight: 600;
}

.step-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---- Feature cards (synthetic data) ------------------------------------- */

.feature-card {
  height: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.feature-card .feature-media {
  display: block;
  background: var(--panel);
}

.feature-card .feature-media img {
  display: block;
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.feature-card .feature-body {
  padding: 1.25rem;
}

.feature-card .feature-body strong {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--site-font);
}

.feature-card .feature-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---- Results carousel ---------------------------------------------------- */

.results-carousel {
  overflow: hidden;
}

.results-carousel .item {
  margin: 5px;
  overflow: hidden;
  border: 1px solid #d7dadd;
  border-radius: 10px;
  padding: 0;
  background: var(--panel);
}

.results-carousel .item img {
  display: block;
  width: 100%;
  height: 320px;
  object-fit: contain;
  background: var(--panel);
}

.results-carousel .item .caption {
  padding: 0.7rem 0.9rem;
  background: #fff;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---- Scope deck slideshow ------------------------------------------------ */

.scope-carousel {
  overflow: hidden;
}

.scope-carousel .item {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--panel-line);
  border-radius: 10px;
  background: var(--panel);
}

.scope-carousel .item a {
  display: block;
}

.scope-carousel .item img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 76vh;
  object-fit: contain;
  background: var(--panel);
}

/* navigation arrows */
.scope-carousel .slider-navigation-previous,
.scope-carousel .slider-navigation-next {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.16);
  height: 46px;
  width: 46px;
}

.scope-carousel .slider-navigation-previous:hover,
.scope-carousel .slider-navigation-next:hover {
  border-color: var(--accent);
}

/* pagination dots */
.scope-carousel .slider-pagination .slider-page {
  background: #c7ccd1;
  opacity: 1;
}

.scope-carousel .slider-pagination .slider-page.is-active {
  background: var(--accent);
}

/* ---- Figure galleries ---------------------------------------------------- */

.gallery-heading {
  margin: 2.5rem 0 1rem;
  font-family: var(--site-font);
  font-size: 1.1rem;
  font-weight: 600;
}

.gallery-heading:first-of-type {
  margin-top: 1rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.gallery.is-gifs {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.gallery figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.gallery figure a {
  display: block;
  background: var(--panel);
}

.gallery figure img {
  display: block;
  width: 100%;
  height: 230px;
  object-fit: contain;
  background: var(--panel);
  transition: transform 0.25s ease;
}

.gallery.is-gifs figure img {
  height: 300px;
}

.gallery figure:hover img {
  transform: scale(1.02);
}

.gallery figcaption {
  padding: 0.7rem 0.85rem;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ---- Scope deck ---------------------------------------------------------- */

.deck {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.75rem;
}

.deck figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.deck figure a {
  display: block;
}

.deck figure img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.deck figure:hover img {
  transform: scale(1.04);
}

.deck figcaption {
  position: absolute;
  bottom: 0;
  right: 0;
  padding: 0.15rem 0.5rem;
  border-top-left-radius: 6px;
  background: rgba(31, 36, 41, 0.82);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
}

/* ---- References ---------------------------------------------------------- */

.citation {
  font-size: 0.72em;
  line-height: 0;
  margin-left: 0.12rem;
  vertical-align: super;
  white-space: nowrap;
}

.citation a {
  color: var(--accent-soft);
  font-weight: 700;
}

.reference-list {
  margin: 0;
  padding-left: 1.2rem;
}

.reference-list li {
  margin-bottom: 0.8rem;
  color: var(--muted);
}

.reference-list a {
  color: var(--accent-soft);
  font-weight: 600;
}

/* ---- BibTeX -------------------------------------------------------------- */

#BibTeX pre {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

/* ---- Footer -------------------------------------------------------------- */

.footer {
  background: #fff;
  border-top: 1px solid var(--line);
}

.footer .icon-link {
  font-size: 22px;
  color: var(--ink);
  margin: 0 0.4rem;
}

.footer .icon-link:hover {
  color: var(--accent);
}

/* ---- Lightbox ------------------------------------------------------------ */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  place-items: center;
  padding: 4rem 1.5rem 2rem;
  background: rgba(20, 23, 26, 0.9);
}

.lightbox.is-open {
  display: grid;
}

.lightbox img {
  max-width: min(1100px, 95vw);
  max-height: 80vh;
  object-fit: contain;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.lightbox p {
  max-width: min(900px, 92vw);
  margin-top: 1rem;
  color: #fff;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 1.1rem;
  right: 1.4rem;
  min-height: 40px;
  padding: 0.5rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.18);
}

/* ---- Responsive ---------------------------------------------------------- */

@media screen and (max-width: 1023px) {
  .deck {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media screen and (max-width: 768px) {
  .gallery,
  .gallery.is-gifs {
    grid-template-columns: 1fr;
  }
  .finetune-toolbar select {
    width: 100%;
  }
  .finetune-plot-wrap {
    overflow: hidden;
  }
  .finetune-plot-wrap svg {
    width: 100%;
    min-height: 0;
  }
  .deck {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .gallery figure img,
  .gallery.is-gifs figure img {
    height: auto;
    max-height: 70vh;
  }
}

@media screen and (max-width: 768px) {
  .publication-title {
    font-size: 1.6rem;
    line-height: 1.2;
  }
  .subtitle.is-5 {
    font-size: 1rem;
  }
  .section {
    padding-left: 1.1rem;
    padding-right: 1.1rem;
  }
  .navbar-logo {
    width: 46px;
    height: 28px;
  }
  .home-button-long {
    display: none;
  }
  .home-button-short {
    display: inline;
  }
  /* 22 pagination dots overflow on phones; arrows are enough */
  .scope-carousel .slider-pagination {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .gallery figure img,
  .deck figure img,
  .finetune-bar,
  .section-tracker a,
  .section-tracker .dot,
  .section-tracker .lbl {
    transition: none;
  }
}