/* Project-specific styling layered on top of the Academic Project Page template (index.css).
   Colour pairing follows the paper and the simulator:
   blue = direct LED and its cone, red = surface reflection and its cone,
   amber = samples inside both cones, teal = particle filter estimate. */

:root {
  --primary-color: #2459B8;
  --primary-hover: #1C4794;
  --c-dir: #2459B8;
  --c-ref: #C2412B;
  --c-inl: #B87506;
  --c-est: #0B7381;
  --c-ink: #101A1D;
  --c-dim: #6B7B80;
  --c-water: #DCE8EE;
  --c-water-line: #8FB3C2;
}

.c-dir { color: var(--c-dir); font-weight: 600; }
.c-ref { color: var(--c-ref); font-weight: 600; }

/* ---------- title ---------- */
.publication-venue { margin: 0 0 1.25rem; font-size: .9rem; }
.publication-title { font-size: clamp(1.9rem, 4.2vw, 2.9rem) !important; text-wrap: balance; }
.publication-authors { margin-bottom: .5rem; }
.publication-affiliations { color: var(--text-secondary); margin-bottom: 1.5rem; }
.publication-affiliations .author-block { margin: 0 .6rem; }
.publication-affiliations a { color: inherit; text-decoration: underline; text-decoration-color: var(--border-color); text-underline-offset: 3px; }
.publication-affiliations a:hover { color: var(--primary-color); }

/* ---------- teaser ---------- */
.teaser .hero-body { padding-top: 0; }
.teaser-figure { margin: 0 0 2rem; }
.teaser-figure img { display: block; width: 100%; height: auto; }
.teaser-figure figcaption, .gallery-item figcaption, .paper-figure figcaption {
  font-size: .9rem; color: var(--text-secondary); margin-top: .75rem; text-align: center;
}
.lead {
  font-size: 1.2rem; line-height: 1.7; color: var(--text-primary);
  max-width: 46rem; margin: 0 auto 2.5rem; text-align: center; text-wrap: pretty;
}
.stats {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem;
  max-width: 46rem; margin: 0 auto;
}
.stat {
  background: var(--background-secondary); border: 1px solid var(--border-color);
  border-radius: var(--border-radius); padding: 1.25rem 1rem; text-align: center;
}
.stat-value {
  font-size: 2rem; font-weight: 800; letter-spacing: -.02em; line-height: 1.1;
  color: var(--text-primary); font-variant-numeric: tabular-nums;
}
.stat-label { font-size: .85rem; color: var(--text-secondary); margin-top: .5rem; line-height: 1.45; }
@media (max-width: 560px) { .stats { grid-template-columns: minmax(0, 1fr); } }

/* ---------- video ---------- */
.video-slot { background: #0E1517; }
.video-slot:hover { transform: none; }
.video-placeholder {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .75rem; color: #C9D6D8; text-align: center; padding: 1rem;
}
.video-placeholder .fa-youtube { color: #FF3D3D; }
.video-placeholder p { font-size: 1.1rem; margin: 0; }
.video-placeholder a { color: #8FC3FF; font-size: .95rem; }
.video-placeholder a:hover { color: #fff; }

/* ---------- section helpers ---------- */
.section-intro {
  max-width: 44rem; margin: -0.5rem auto 2.5rem; text-align: center;
  color: var(--text-secondary); font-size: 1.05rem; text-wrap: pretty;
}
.title.is-3.has-text-centered { margin-left: auto; margin-right: auto; }
/* No decorative gradient bars under headings or on link hover. */
.title.is-3 { padding-bottom: 0; margin-bottom: 1.5rem !important; }
.title.is-3::after, .publication-authors a::after { display: none; }

/* ---------- method ---------- */
.method-grid {
  display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); gap: 2rem; align-items: start;
  max-width: 1180px; margin: 0 auto;
}
@media (max-width: 960px) { .method-grid { grid-template-columns: minmax(0, 1fr); } }
.method-figure {
  background: #fff; border: 1px solid var(--border-color); border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md); padding: 1rem 1rem .75rem;
}
#method-svg { display: block; width: 100%; height: auto; font-family: 'Inter', sans-serif; }
#method-svg .dg { transition: opacity .35s ease; }
#method-svg.focus .dg:not(.on) { opacity: .07; }
#method-svg text {
  font-size: 15px; fill: var(--c-ink);
  paint-order: stroke; stroke: #fff; stroke-width: 4px; stroke-linejoin: round;
}
#method-svg text.dim { fill: var(--c-dim); font-size: 13.5px; }
#method-svg .inset text { stroke: none; }
#method-svg .math { font-family: 'KaTeX_Math', 'Times New Roman', serif; font-style: italic; font-size: 19px; }
.method-legend {
  display: flex; flex-wrap: wrap; gap: .35rem 1.1rem; justify-content: center;
  font-size: .8rem; color: var(--text-secondary); margin-top: .5rem;
}
.method-legend i, .plot-legend i {
  display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: .4rem; vertical-align: -1px;
}
.method-note { font-size: .78rem; color: var(--text-light); text-align: center; margin-top: .25rem; }

.method-panel { display: flex; flex-direction: column; gap: 1rem; min-width: 0; }
.step-nav { display: flex; flex-wrap: wrap; gap: .4rem; }
.step-pill {
  font: 600 .85rem/1 'Inter', sans-serif; color: var(--text-secondary);
  background: #fff; border: 1px solid var(--border-color); border-radius: 999px;
  min-width: 2.2rem; height: 2.2rem; padding: 0 .8rem; cursor: pointer; transition: var(--transition);
}
.step-pill:hover { border-color: var(--primary-color); color: var(--primary-color); }
.step-pill[aria-selected="true"] { background: var(--c-ink); border-color: var(--c-ink); color: #fff; }
.step-pill:focus-visible, .step-btn:focus-visible, .chip:focus-visible { outline: 2px solid var(--primary-color); outline-offset: 2px; }

.step-card {
  background: #fff; border: 1px solid var(--border-color); border-left: 4px solid var(--step-color, var(--c-ink));
  border-radius: var(--border-radius); padding: 1.25rem 1.4rem; box-shadow: var(--shadow-sm); min-height: 15rem;
}
.step-kicker {
  font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--step-color, var(--c-dim));
}
.step-title { font-size: 1.3rem; font-weight: 700; margin: .25rem 0 .75rem; color: var(--text-primary); }
.step-body { color: var(--text-secondary); line-height: 1.65; }
.step-body p + p { margin-top: .6rem; }
.step-body .eq { overflow-x: auto; overflow-y: hidden; padding: .35rem 0; color: var(--text-primary); }
.step-body .ref { font-size: .8rem; color: var(--text-light); }
.step-controls { display: flex; justify-content: space-between; gap: .5rem; }
.step-btn {
  font: 600 .9rem 'Inter', sans-serif; color: var(--text-primary); background: #fff;
  border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: .55rem 1rem; cursor: pointer;
  transition: var(--transition);
}
.step-btn:hover:not(:disabled) { border-color: var(--primary-color); color: var(--primary-color); }
.step-btn:disabled { opacity: .4; cursor: default; }

.insight {
  display: flex; gap: 1rem; align-items: flex-start; max-width: 52rem; margin: 2.5rem auto 0;
  background: #fff; border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 1.1rem 1.4rem;
}
.insight > svg, .insight > i { color: #E0A100; font-size: 1.3rem; margin-top: .2rem; flex: none; }
.insight p { color: var(--text-secondary); margin: 0; }
.insight strong { color: var(--text-primary); }

.paper-figure { max-width: 52rem; margin: 1.5rem auto 0; }
.paper-figure summary {
  cursor: pointer; text-align: center; color: var(--primary-color); font-weight: 600; font-size: .95rem;
}
.paper-figure figure { margin: 1rem 0 0; background: #fff; border-radius: var(--border-radius); padding: 1rem; border: 1px solid var(--border-color); }
.paper-figure img { display: block; width: 100%; height: auto; }

/* ---------- embedded simulator ---------- */
.sim-container { max-width: 1320px; }
/* leave room for the section menu on the right */
@media (min-width: 1181px) { .sim-container { max-width: min(1320px, calc(100vw - 10rem)); } }
.sim-embed {
  height: min(820px, 85vh); border-radius: var(--border-radius-lg); overflow: hidden;
  border: 1px solid var(--border-color); box-shadow: var(--shadow-xl);
  /* shown until the simulator loads */
  background: #E7ECEC url(../images/simulator_preview.jpg) center top / cover no-repeat;
}
#sim-frame { display: block; width: 100%; height: 100%; border: 0; }
#sim-frame[src] { background: #E7ECEC; }
.sim-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .6rem; margin: -.75rem 0 1.25rem; }
.sim-actions .button { height: 2.25em; font-size: .9rem; }
.button.is-outlined-dark {
  background: #fff !important; color: var(--text-primary) !important;
  border: 1px solid var(--border-color) !important; box-shadow: var(--shadow-sm);
}
.button.is-outlined-dark:hover { border-color: var(--primary-color) !important; color: var(--primary-color) !important; }

/* ---------- section menu (right edge, wide screens only) ---------- */
.section-nav {
  position: fixed; right: 1.5rem; top: 50%; transform: translateY(-50%); z-index: 900;
  display: flex; flex-direction: column; gap: .2rem;
}
.section-nav a {
  display: flex; align-items: center; justify-content: flex-end; gap: .7rem;
  padding: .4rem 0; color: var(--text-secondary); font-size: .92rem; font-weight: 500; text-decoration: none;
}
.section-nav a::after {
  content: ""; flex: none; width: 12px; height: 12px; border-radius: 50%;
  background: var(--border-color); transition: background .2s, transform .2s;
}
.section-nav span {
  opacity: 0; transform: translateX(6px); transition: opacity .2s, transform .2s;
  background: rgba(255, 255, 255, .94); padding: .15rem .55rem; border-radius: 6px; white-space: nowrap;
  box-shadow: var(--shadow-sm);
}
.section-nav:hover span, .section-nav a:focus-visible span { opacity: 1; transform: none; }
.section-nav a:hover, .section-nav a.is-active { color: var(--text-primary); }
.section-nav a:hover::after { background: var(--text-secondary); }
.section-nav a.is-active::after { background: var(--primary-color); transform: scale(1.3); }
@media (max-width: 1180px) { .section-nav { display: none; } }
@media (prefers-reduced-motion: reduce) { .section-nav a::after, .section-nav span { transition: none; } }

/* ---------- experiments ---------- */
.gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; }
.gallery-wide { grid-column: 1 / -1; }
@media (max-width: 700px) { .gallery { grid-template-columns: minmax(0, 1fr); } }
.gallery-item { margin: 0; }
.gallery-item img {
  display: block; width: 100%; height: auto; border-radius: var(--border-radius);
  box-shadow: var(--shadow-md); background: #fff; transition: var(--transition);
}
.gallery-item a:hover img { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.gallery-item figcaption { text-align: left; }
.gallery-item:not(.gallery-wide) img { aspect-ratio: 4 / 3; object-fit: contain; }
.gallery-item.on-dark img { background: #000; }

.platforms { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 2rem; }
@media (max-width: 700px) { .platforms { grid-template-columns: minmax(0, 1fr); } }
.platform { background: #fff; border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 1rem 1.2rem; }
.platform h4 { font-weight: 700; margin-bottom: .35rem; display: flex; gap: .5rem; align-items: center; }
.platform h4 svg { color: var(--primary-color); }
.platform p { font-size: .9rem; color: var(--text-secondary); }

/* ---------- results ---------- */
.results-tabs { margin-bottom: 1.75rem !important; }
.results-tabs ul { flex-wrap: wrap; row-gap: .4rem; }
.results-tabs li.is-active a { background-color: var(--c-ink) !important; border-color: var(--c-ink) !important; }
.tab-panel[hidden] { display: none; }
.panel-lead { color: var(--text-secondary); max-width: 46rem; margin: 0 auto 1.5rem; text-align: center; text-wrap: pretty; }
.plot-switch { display: flex; flex-wrap: wrap; gap: .4rem; justify-content: center; margin-bottom: 1rem; }
.chip {
  font: 600 .82rem 'Inter', sans-serif; color: var(--text-secondary); background: #fff;
  border: 1px solid var(--border-color); border-radius: 999px; padding: .4rem .9rem; cursor: pointer; transition: var(--transition);
}
.chip:hover { border-color: var(--primary-color); color: var(--primary-color); }
.chip.is-active { background: var(--primary-color); border-color: var(--primary-color); color: #fff; }
.plot { margin: 0 0 1rem; }
.plot img {
  display: block; width: 100%; height: auto; background: #fff;
  border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: .5rem;
}
.plot figcaption { text-align: center; font-size: .88rem; color: var(--text-secondary); margin-top: .4rem; }
.plot-legend { display: flex; flex-wrap: wrap; gap: .3rem 1.1rem; justify-content: center; font-size: .85rem; color: var(--text-secondary); }
.plot-legend.centered { margin: -0.5rem 0 1.25rem; }
.legend-note { color: var(--text-light); }
.sub-title { font-weight: 700; font-size: 1.1rem; margin-bottom: .75rem; }

.table-wrap { overflow-x: auto; margin-top: 1rem; }
.results-table, .comp-table { font-size: .9rem; font-variant-numeric: tabular-nums; background: transparent; }
.results-table caption { caption-side: top; text-align: left; font-size: .85rem; color: var(--text-secondary); padding-bottom: .4rem; }
.results-table th, .results-table td, .comp-table th, .comp-table td { vertical-align: middle; }
.results-table td, .results-table th { white-space: nowrap; }
.comp-table { min-width: 640px; }
.comp-table tbody th { white-space: nowrap; }
.results-table td, .comp-table td { text-align: center; }
.results-table thead th, .comp-table thead th { text-align: center; color: var(--text-secondary); font-weight: 600; }
.results-table tr.group > * { border-top: 2px solid var(--border-color); }
.results-table .win { font-weight: 700; color: var(--c-dir); }
.results-table .win sup, .table-note sup { color: var(--c-ref); }
.m-ours { font-weight: 700; color: var(--c-dir) !important; }
.results-table.compact { font-size: .82rem; }
.results-table.compact th, .results-table.compact td { padding: .35em .45em; }
.table-note { font-size: .82rem; color: var(--text-light); margin-top: .5rem; }
.comp-table tbody th { font-weight: 600; color: var(--text-primary); }
.comp-table td:nth-child(2), .comp-table th:nth-child(2) { background: rgba(36, 89, 184, .06); }
.comp-table .yes { color: #2C7148; font-weight: 700; }
.comp-table .no { color: var(--c-ref); font-weight: 700; }
.comp-table .part { color: #B87506; font-weight: 700; }

.mini-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; margin: .5rem 0 1rem; }
@media (max-width: 760px) { .mini-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.mini-stats > div {
  background: var(--background-secondary); border: 1px solid var(--border-color); border-radius: var(--border-radius);
  padding: .8rem .9rem; text-align: center;
}
.mini-stats .v { display: block; font-weight: 800; font-size: 1.1rem; font-variant-numeric: tabular-nums; }
.mini-stats .l { display: block; font-size: .78rem; color: var(--text-secondary); margin-top: .2rem; }

/* ---------- footer ---------- */
.footer .funding { font-size: .85rem; color: var(--text-secondary); }

/* The template forces every .button to full width on phones; keep the hero buttons that way but not ours. */
@media screen and (max-width: 480px) {
  .sim-actions .button { width: auto; }
}

@media screen and (max-width: 768px) {
  /* The template docks "Related Work" bottom-right on phones; lift scroll-to-top above it. */
  .scroll-to-top { bottom: 5.5rem; }
  .content.has-text-justified { text-align: left !important; }
}

/* Placeholder hero button (code not released yet): looks like the others, just not clickable.
   The template puts its margin on ".link-block a", so give the <span> the same. */
.link-block .button.is-soon { margin: 8px 4px; cursor: default; }
.button.is-dark.is-soon:hover { transform: none; background: var(--text-primary) !important; box-shadow: var(--shadow-md); }
.button.is-soon .soon { font-weight: 500; opacity: .7; margin-left: .3em; }