/* HFX3D — custom academic project page */

:root {
  --hero-bg:    #07090f;
  --dark-bg:    #0d1117;
  --surface:    #ffffff;
  --surface-2:  #f7f8fc;
  --border:     #e5e7eb;
  --text-1:     #0f172a;
  --text-2:     #475569;
  --text-3:     #94a3b8;
  --blue:       #2563eb;
  --blue-dk:    #1d4ed8;
  --blue-t:     rgba(37,99,235,.1);
  --purple:     #7c3aed;
  --radius:     12px;
  --nav-h:      60px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px; line-height: 1.6; color: var(--text-1);
  background: var(--surface); -webkit-font-smoothing: antialiased;
}

/* ── Fade-in ── */
.fade-up { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.fade-up.visible { opacity: 1; transform: none; }

/* ── Layout ── */
.container    { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 820px;  margin: 0 auto; padding: 0 24px; }
.text-center  { text-align: center; }

/* ════════════════════════════════ NAVBAR ═══ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h); z-index: 1000;
  background: rgba(255,255,255,.88); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: border-color .3s, box-shadow .3s;
}
.navbar.scrolled { border-bottom-color: var(--border); box-shadow: 0 1px 20px rgba(0,0,0,.06); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; gap: 28px;
}
.nav-brand { font-weight: 800; font-size: 1.1rem; letter-spacing: -.02em;
  text-decoration: none; color: var(--text-1); flex-shrink: 0; }
.nav-brand span { color: var(--blue); }
.nav-links { display: flex; gap: 2px; flex: 1; }
.nav-links a { text-decoration: none; font-size: .84rem; font-weight: 500; color: var(--text-2);
  padding: 6px 11px; border-radius: 7px; transition: color .15s, background .15s; white-space: nowrap; }
.nav-links a:hover { color: var(--text-1); background: var(--surface-2); }
.nav-actions { display: flex; gap: 8px; flex-shrink: 0; }
.nav-burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px;
  border: none; background: none; margin-left: auto; }
.nav-burger span { display: block; width: 22px; height: 2px; background: var(--text-1); border-radius: 2px; }

/* Mobile nav */
.nav-mobile { display: none; flex-direction: column; gap: 2px;
  position: fixed; top: var(--nav-h); left: 0; right: 0; z-index: 999;
  background: rgba(255,255,255,.97); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); padding: 12px 16px;
  box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.nav-mobile.open { display: flex; }
.nav-mobile a { text-decoration: none; font-size: .9rem; font-weight: 500; color: var(--text-2);
  padding: 10px 12px; border-radius: 8px; transition: all .15s; }
.nav-mobile a:hover { color: var(--text-1); background: var(--surface-2); }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; gap: 7px; padding: 9px 20px;
  border-radius: 8px; font-size: .875rem; font-weight: 600; text-decoration: none;
  cursor: pointer; border: none; transition: all .2s; white-space: nowrap; }
.btn i { font-size: .85em; }
.btn-primary  { background: var(--blue); color: #fff; }
.btn-primary:hover  { background: var(--blue-dk); transform: translateY(-1px); }
.btn-outline  { background: transparent; color: var(--text-1); border: 1.5px solid var(--border); }
.btn-outline:hover  { border-color: var(--blue); color: var(--blue); background: var(--blue-t); transform: translateY(-1px); }
.btn-ghost-dark { background: rgba(255,255,255,.08); color: rgba(255,255,255,.8); border: 1px solid rgba(255,255,255,.14); }
.btn-ghost-dark:hover { background: rgba(255,255,255,.15); color: #fff; transform: translateY(-1px); }
.btn-accent { background: linear-gradient(135deg, var(--blue), var(--purple));
  color: #fff; box-shadow: 0 4px 20px rgba(37,99,235,.35); }
.btn-accent:hover { opacity: .9; transform: translateY(-2px); }

/* ════════════════════════════════ HERO ═══ */
#hero {
  min-height: 100vh; background: var(--hero-bg);
  padding: calc(var(--nav-h) + 80px) 24px 80px;
  display: flex; align-items: center; position: relative; overflow: hidden;
}
#hero::before { content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(37,99,235,.18), transparent),
    radial-gradient(ellipse 40% 40% at 80% 60%, rgba(124,58,237,.12), transparent); }
#hero::after { content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, black, transparent); }
.hero-inner { position: relative; z-index: 1; max-width: 900px; margin: 0 auto; text-align: center; }
.hero-badge { display: inline-block; padding: 5px 16px; border-radius: 100px; margin-bottom: 24px;
  font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  background: rgba(37,99,235,.15); border: 1px solid rgba(37,99,235,.35); color: #93c5fd; }
.hero-title { font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 800; letter-spacing: -.04em;
  line-height: 1.12; margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 40%, #93c5fd 70%, #c4b5fd 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: 1.05rem; color: rgba(255,255,255,.5); margin-bottom: 10px;
  line-height: 1.65; max-width: 620px; margin-left: auto; margin-right: auto; }
.hero-authors { font-size: .9rem; color: rgba(255,255,255,.4); margin-bottom: 6px; }
.hero-authors a { color: rgba(255,255,255,.6); text-decoration: none; }
.hero-authors a:hover { color: #93c5fd; }
.hero-affil { font-size: .8rem; color: rgba(255,255,255,.28); margin-bottom: 40px; }
.hero-btns { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.hero-stats { display: flex; margin-top: 64px;
  border-radius: var(--radius); border: 1px solid rgba(255,255,255,.07); overflow: hidden; }
.hero-stat { flex: 1; padding: 24px 16px; text-align: center; border-right: 1px solid rgba(255,255,255,.07); }
.hero-stat:last-child { border-right: none; }
.hero-stat-num { font-size: 2.2rem; font-weight: 800; letter-spacing: -.04em; line-height: 1;
  background: linear-gradient(135deg, #fff, #93c5fd);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-stat-lbl { font-size: .7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .1em; color: rgba(255,255,255,.3); margin-top: 6px; }

/* ════════════════════════════════ TEASER ═══ */
#teaser { background: var(--surface-2); padding: 80px 24px; }
.teaser-vid-pair {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 20px; max-width: 1200px; margin: 0 auto;
}
.teaser-vid-wrap {
  position: relative; border-radius: 14px; overflow: hidden;
  box-shadow: 0 16px 56px rgba(0,0,0,.14); border: 1px solid var(--border);
}
.teaser-vid-wrap video { width: 100%; display: block; aspect-ratio: 16/9; object-fit: cover; }
.teaser-vid-lbl {
  position: absolute; bottom: 10px; left: 10px;
  background: rgba(0,0,0,.62); color: #fff; backdrop-filter: blur(6px);
  font-size: .72rem; font-weight: 600; letter-spacing: .04em;
  padding: 4px 10px; border-radius: 6px; pointer-events: none;
}
.teaser-caption { text-align: center; margin-top: 16px; font-size: .82rem; color: var(--text-3); }
.teaser-legend {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 6px 18px; max-width: 900px; margin: 18px auto 0;
}
.tl-item { display: flex; align-items: center; gap: 6px;
  font-size: .78rem; color: var(--text-2); font-weight: 500; }
.tl-dot { width: 11px; height: 11px; border-radius: 50%; flex-shrink: 0; }
@media(max-width: 768px) { .teaser-vid-pair { grid-template-columns: 1fr; } }

/* ════════════════════════════════ SECTION HEAD ═══ */
.section-head { margin-bottom: 48px; }
.section-label { font-size: .72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .12em; color: var(--blue); margin-bottom: 10px; }
.section-title { font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 800;
  letter-spacing: -.03em; line-height: 1.2; color: var(--text-1); }
.section-sub { font-size: .9rem; color: var(--text-3); margin-top: 8px; }

/* Dark section head overrides */
.dark-head .section-label { color: #60a5fa; }
.dark-head .section-title { color: #f1f5f9; }
.dark-head .section-sub   { color: rgba(255,255,255,.32); }

/* ════════════════════════════════ ABSTRACT ═══ */
#abstract { padding: 100px 24px; background: var(--surface); }
.abstract-body { font-size: 1.05rem; color: var(--text-2); line-height: 1.8; }
.abstract-body p + p { margin-top: 1.2em; }
.abstract-body strong { color: var(--text-1); font-weight: 600; }

/* ════════════════════════════════ DATASET ═══ */
#dataset { padding: 100px 24px; background: var(--surface-2); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 240px));
  justify-content: center; gap: 14px; margin-bottom: 64px; }
.stat-card { background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px;
  transition: border-color .2s, transform .2s; }
.stat-card:hover { border-color: var(--blue); transform: translateY(-2px); }
.stat-card-label { font-size: .7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .08em; color: var(--text-3); margin-bottom: 4px; }
.stat-card-value { font-size: 1.45rem; font-weight: 800; letter-spacing: -.04em; color: var(--text-1); }

.taxonomy-title { font-size: 1rem; font-weight: 700; color: var(--text-1); margin-bottom: 16px; }
.taxonomy-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 64px; }
.class-chip { display: flex; align-items: center; gap: 7px; padding: 6px 14px; border-radius: 100px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: .82rem; font-weight: 500; color: var(--text-2);
  transition: border-color .2s, transform .15s; }
.class-chip:hover { border-color: var(--blue); transform: scale(1.03); }
.class-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

.bld-strip-title { font-size: 1rem; font-weight: 700; color: var(--text-1); margin-bottom: 16px; }
.bld-strip { display: flex; gap: 12px; overflow-x: auto; padding: 4px 0 14px;
  scrollbar-width: thin; scrollbar-color: var(--border) transparent;
  scroll-snap-type: x mandatory; }
.bld-strip::-webkit-scrollbar { height: 4px; }
.bld-strip::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.bld-strip-item { flex-shrink: 0; scroll-snap-align: start;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; width: 178px;
  transition: border-color .2s, transform .2s; }
.bld-strip-item:hover { border-color: var(--blue); transform: translateY(-2px); }
.bld-strip-item img { width: 100%; aspect-ratio: 4/3; object-fit: cover;
  background: var(--surface-2); display: block; }
.bld-strip-foot { padding: 8px 10px; }
.bld-strip-name { font-size: .74rem; font-weight: 600; color: var(--text-1);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bld-strip-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 3px; }
.bld-strip-id { font-size: .62rem; font-family: 'JetBrains Mono', monospace; color: var(--text-3); }
.badge { font-size: .58rem; font-weight: 700; padding: 2px 7px; border-radius: 4px; }
.badge-train { background: rgba(37,99,235,.1); color: var(--blue); }
.badge-test  { background: rgba(124,58,237,.1); color: var(--purple); }

/* ════════════════════════════════ GEOSPATIAL ═══ */
#geospatial { background: var(--dark-bg); padding: 100px 0 0; }
.geo-inner { padding: 0 24px 48px; }
.geo-layout { display: grid; grid-template-columns: 1fr 320px; }
#coverageMap { height: 520px; }
.geo-panel { background: #090c15; border-left: 1px solid rgba(255,255,255,.06);
  padding: 24px; display: flex; flex-direction: column; gap: 16px; height: 520px; overflow-y: auto; }
.gp-top { display: flex; align-items: flex-start; gap: 10px; }
.gp-id-badge { font-family: 'JetBrains Mono', monospace; font-size: .62rem; font-weight: 700;
  padding: 3px 8px; border-radius: 5px; background: rgba(37,99,235,.2);
  border: 1px solid rgba(37,99,235,.4); color: #60a5fa; flex-shrink: 0; margin-top: 3px; }
#gpName { font-size: .9rem; font-weight: 700; color: #f1f5f9; }
#gpUni  { font-size: .72rem; color: rgba(255,255,255,.32); margin-top: 2px; }
.gp-stats { display: flex; gap: 18px; }
.gp-stat { font-size: .72rem; color: rgba(255,255,255,.38); }
.gp-stat span { color: rgba(255,255,255,.72); font-weight: 600; }
.gp-canvas-wrap { position: relative; border-radius: 10px; overflow: hidden;
  border: 1px solid rgba(255,255,255,.07); background: #0a0a14; aspect-ratio: 16/9; }
#gpCanvas { width: 100%; height: 100%; display: block; }
#gpLoading, #gpNoVideo { position: absolute; inset: 0; display: none;
  align-items: center; justify-content: center; flex-direction: column; gap: 8px;
  font-size: .75rem; color: rgba(255,255,255,.35); }
.spinner { width: 28px; height: 28px; border-radius: 50%;
  border: 3px solid rgba(255,255,255,.08); border-top-color: #60a5fa;
  animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
#gpModes { display: flex; gap: 3px; background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.07); border-radius: 100px; padding: 3px; width: fit-content; }
.gp-mode { border: none; border-radius: 100px; padding: 4px 13px; font-size: .7rem; font-weight: 600;
  background: transparent; color: rgba(255,255,255,.38); cursor: pointer; transition: all .15s; }
.gp-mode.active { background: var(--blue); color: #fff; }
#gpLegend { display: flex; flex-wrap: wrap; gap: 5px 10px; opacity: .4; transition: opacity .25s; }
.gp-legend-item { display: flex; align-items: center; gap: 5px; font-size: .64rem; color: rgba(255,255,255,.65); }
.gp-lc { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; display: inline-block; }
#gpCta { width: 100%; padding: 10px; border-radius: 9px; cursor: pointer;
  background: rgba(37,99,235,.14); border: 1px solid rgba(37,99,235,.35);
  color: #93c5fd; font-size: .8rem; font-weight: 700; transition: all .2s; margin-top: auto; }
#gpCta:hover { background: rgba(37,99,235,.26); }
.mapboxgl-ctrl-logo, .mapboxgl-ctrl-attrib { display: none !important; }

/* ════════════════════════════════ 3D EXPLORER ═══ */
#explorer { padding: 80px 0 100px; background: var(--dark-bg); border-top: 1px solid rgba(255,255,255,.05); }
.explorer-wrap { max-width: 1300px; margin: 0 auto; padding: 0 24px; }

.bsl-outer { position: relative; overflow: hidden; margin-bottom: 14px; }
.bsl-outer::before, .bsl-outer::after { content: ''; position: absolute; top: 0; bottom: 0; width: 56px; z-index: 2; pointer-events: none; }
.bsl-outer::before { left: 0; background: linear-gradient(90deg, var(--dark-bg), transparent); }
.bsl-outer::after  { right: 0; background: linear-gradient(-90deg, var(--dark-bg), transparent); }
#bslTrack { display: flex; gap: 8px; padding: 4px 0 8px; width: max-content; animation: bsl-scroll 50s linear infinite; will-change: transform; }
@keyframes bsl-scroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
.bsl-outer:hover #bslTrack { animation-play-state: paused; cursor: pointer; }
.bsl-item { flex-shrink: 0; display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 6px 8px; border-radius: 10px; border: 1px solid rgba(255,255,255,.07);
  background: rgba(255,255,255,.03); cursor: pointer; transition: all .18s; min-width: 80px; }
.bsl-item:hover   { border-color: rgba(37,99,235,.5); background: rgba(37,99,235,.1); }
.bsl-item.bsl-active { border-color: var(--blue); background: rgba(37,99,235,.15); }
.bsl-thumb { width: 64px; height: 44px; border-radius: 6px; object-fit: cover; background: rgba(255,255,255,.05); display: block; }
.bsl-label { font-size: .58rem; color: rgba(255,255,255,.42); font-weight: 600; text-align: center; max-width: 74px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bsl-id    { font-family: 'JetBrains Mono', monospace; font-size: .52rem; color: rgba(255,255,255,.2); }

.dv-frame { border: 1px solid rgba(255,255,255,.07); border-radius: var(--radius); overflow: hidden; background: #f4f5f8; }
.dv-canvases { position: relative; width: 100%; height: 580px; display: flex; }
.dv-half { flex: 1; position: relative; cursor: grab; }
.dv-half:active { cursor: grabbing; }
.dv-canvases::after { content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: rgba(255,255,255,.28); pointer-events: none; z-index: 5; }

.dv-vp-label { position: absolute; top: 12px; z-index: 10; font-size: .64rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em; padding: 3px 10px; border-radius: 6px;
  background: rgba(0,0,0,.42); backdrop-filter: blur(8px); color: rgba(255,255,255,.65); pointer-events: none; }
.dv-vp-label-left  { left: 12px; }
.dv-vp-label-right { left: calc(50% + 12px); }

.dv-mode-bar { position: absolute; top: 12px; right: 12px; z-index: 10;
  display: flex; gap: 3px; background: rgba(7,9,15,.78); backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,.1); border-radius: 100px; padding: 3px; }
.dv-mode-btn { border: none; border-radius: 100px; padding: 4px 12px; font-size: .7rem; font-weight: 600;
  background: transparent; color: rgba(255,255,255,.42); cursor: pointer; transition: all .15s;
  display: flex; align-items: center; gap: 5px; white-space: nowrap; }
.dv-mode-btn.active { background: var(--blue); color: #fff; }
.dv-mode-btn.dv-mode-btn-dim { opacity: .3; pointer-events: none; }
.dv-mode-text { display: none; }
@media(min-width: 768px) { .dv-mode-text { display: inline; } }

.dv-right-label { position: absolute; bottom: 12px; right: 12px; z-index: 10; font-size: .64rem;
  font-weight: 700; color: rgba(255,255,255,.6); background: rgba(0,0,0,.42); backdrop-filter: blur(6px);
  border-radius: 6px; padding: 3px 10px; pointer-events: none; }

#dvLoading { position: absolute; inset: 0; display: none; flex-direction: column;
  align-items: center; justify-content: center; gap: 12px;
  background: rgba(244,245,248,.92); z-index: 20; font-size: .85rem; color: #555; }
#dvPlaceholder { position: absolute; inset: 0; display: none; flex-direction: column;
  align-items: center; justify-content: center; gap: 14px;
  background: rgba(244,245,248,.94); z-index: 20; text-align: center; padding: 2rem; }
#dvPlaceholder > i { font-size: 2.5rem; opacity: .2; color: #333; }
#dvPlaceholder > span { font-size: .85rem; color: #555; }
#dvPlaceholderCmd { font-family: 'JetBrains Mono', monospace; font-size: .72rem; color: var(--blue);
  background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 6px; padding: 8px 14px; }
#dvPlaceholder small { font-size: .72rem; color: #888; }

.dv-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px;
  background: #090c15; border-top: 1px solid rgba(255,255,255,.06); }
#dvTitle { flex: 1; font-size: .73rem; font-weight: 600; color: rgba(255,255,255,.55);
  font-family: 'JetBrains Mono', monospace; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dv-toolbar { display: flex; align-items: center; gap: 5px; flex-shrink: 0; }
.dv-btn { border: 1px solid rgba(255,255,255,.1); border-radius: 7px; background: rgba(255,255,255,.05);
  color: rgba(255,255,255,.45); font-size: .7rem; padding: 4px 10px; cursor: pointer;
  transition: all .15s; display: flex; align-items: center; gap: 5px; }
.dv-btn:hover  { border-color: rgba(255,255,255,.2); color: rgba(255,255,255,.8); }
.dv-btn.active { background: rgba(37,99,235,.2); border-color: rgba(37,99,235,.45); color: #93c5fd; }
.dv-zoom-btn { border: 1px solid rgba(255,255,255,.1); border-radius: 6px; background: rgba(255,255,255,.05);
  color: rgba(255,255,255,.45); font-size: .88rem; width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all .15s; }
.dv-zoom-btn:hover { border-color: rgba(255,255,255,.2); color: rgba(255,255,255,.8); }

#dvLegend { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 10px 18px; justify-content: center; }
.dv-legend-item { display: flex; align-items: center; gap: 6px; font-size: .72rem; color: rgba(255,255,255,.48); }
.dv-lc { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; display: inline-block; }

/* ════════════════════════════════ COMPARISON ═══ */
#comparison { padding: 100px 24px; background: var(--surface); }
.cmp-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
img-comparison-slider {
  display: block; border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: 0 8px 32px rgba(0,0,0,.08);
  --divider-width: 3px; --divider-color: #2563eb; --handle-size: 40px;
}
.cmp-caption { text-align: center; font-size: .78rem; color: var(--text-3); margin-top: 10px; }
.cmp-placeholder { aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 8px;
  background: var(--surface-2); color: var(--text-3); font-size: .8rem; text-align: center;
  border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }

/* ════════════════════════════════ VIDEO RESULTS ═══ */
#results-video { padding: 100px 24px; background: var(--dark-bg); border-top: 1px solid rgba(255,255,255,.05); }
.video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.video-card { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.07);
  border-radius: var(--radius); overflow: hidden; transition: border-color .2s, transform .2s;
  content-visibility: auto; contain-intrinsic-size: auto 220px; }
.video-card:hover { border-color: rgba(37,99,235,.4); transform: translateY(-2px); }
.video-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
.video-pair video, .video-pair img.vid-ph { width: 100%; display: block; background: #0a0a14; aspect-ratio: 16/9; object-fit: cover; }
.video-pair img.vid-ph-sem { filter: brightness(0.5) hue-rotate(200deg); }
.video-foot { padding: 8px 10px; display: flex; justify-content: space-between; align-items: center; }
.video-name { font-size: .7rem; font-weight: 600; color: rgba(255,255,255,.7); }
.video-id   { font-size: .6rem; font-family: 'JetBrains Mono', monospace; color: rgba(255,255,255,.28); }

/* ════════════════════════════════ BENCHMARK ═══ */
#benchmark { padding: 100px 24px; background: var(--surface); }
.bench-note { font-size: .8rem; color: var(--text-3); margin-top: 10px; }
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 40px; }
table { width: 100%; border-collapse: collapse; font-size: .875rem; }
thead th { background: var(--surface-2); color: var(--text-3); font-size: .68rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em; padding: 12px 16px;
  border-bottom: 1px solid var(--border); white-space: nowrap; }
tbody td { padding: 12px 16px; border-bottom: 1px solid var(--border); color: var(--text-2); vertical-align: middle; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--surface-2); }
.td-left  { text-align: left; font-weight: 600; color: var(--text-1); }
.td-num   { text-align: center; }
.td-best  { text-align: center; font-weight: 700; color: var(--text-1); }
.td-high  { text-align: center; background: rgba(22,163,74,.08) !important; color: #16a34a; font-weight: 600; }
.td-mid   { text-align: center; background: rgba(234,179,8,.08) !important; color: #ca8a04; font-weight: 600; }
.td-low   { text-align: center; background: rgba(220,38,38,.08) !important; color: #dc2626; font-weight: 600; }
.td-miou  { text-align: center; font-weight: 700; color: var(--blue); }
.row-miou td { border-top: 2px solid var(--border) !important; }
.row-miou .td-left { color: var(--blue); }
.badge-prog { display: inline-block; font-size: .6rem; font-weight: 700; padding: 2px 7px; border-radius: 4px;
  margin-left: 6px; vertical-align: middle;
  background: rgba(22,163,74,.1); color: #16a34a; border: 1px solid rgba(22,163,74,.2); }

/* ════════════════════════════ BENCHMARK EXTRAS ═══ */
.bm-tbl-title { font-size: 1rem; font-weight: 700; color: var(--text-1); margin-bottom: 10px; }
.bm-tbl-note  { font-size: .78rem; color: var(--text-3); margin-bottom: 14px; }
.th-rank  { text-align: center !important; width: 42px; }
.th-sep   { text-align: center; border-left: 2px solid var(--border) !important; }
.td-rank  { text-align: center; padding: 10px 6px !important; }
.rank-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 50%;
  font-size: .68rem; font-weight: 700; flex-shrink: 0;
}
.rk1 { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }
.rk2 { background: #f1f5f9; color: #475569; border: 1px solid #94a3b8; }
.rk3 { background: #fff7ed; color: #9a3412; border: 1px solid #fdba74; }
.rkn { background: var(--surface-2); color: var(--text-3); border: 1px solid var(--border); }
.row-rank1 td { background: rgba(37,99,235,.035) !important; }
.row-rank1 .td-left { font-weight: 700; color: var(--text-1); border-left: 3px solid var(--blue); }

/* ════════════════════════════════ DOWNLOAD ═══ */
#download { padding: 100px 24px; background: var(--surface); }
.download-box {
  max-width: 640px; margin: 0 auto;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px 36px;
  display: flex; flex-direction: column; align-items: center; gap: 28px;
  box-shadow: 0 4px 24px rgba(0,0,0,.06);
}
.download-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; width: 100%; }
.download-stat { display: flex; flex-direction: column; align-items: center; gap: 4px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 16px 8px; }
.download-num { font-size: 1.25rem; font-weight: 700; color: var(--blue); }
.download-lbl { font-size: .72rem; color: var(--text-3); font-weight: 500; text-align: center; }
.download-note { font-size: .8rem; color: var(--text-3); text-align: center; }
.download-note a { color: var(--blue); text-decoration: none; }
.download-note a:hover { text-decoration: underline; }
.btn-lg { padding: 13px 30px; font-size: 1rem; }
@media(max-width: 600px) { .download-grid { grid-template-columns: repeat(2, 1fr); } }

/* ══════════════════════════════ ACKNOWLEDGMENTS ═══ */
#acknowledgments { padding: 80px 24px; background: var(--surface-2); }
.ack-body { max-width: 680px; margin: 32px auto 0; color: var(--text-2);
  font-size: .9375rem; line-height: 1.8; text-align: center; }

/* ════════════════════════════════ CITATION ═══ */
#citation { padding: 100px 24px; background: var(--surface-2); }
.citation-box { max-width: 760px; margin: 0 auto; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: 0 4px 24px rgba(0,0,0,.06); }
.citation-hdr { display: flex; justify-content: space-between; align-items: center;
  padding: 12px 18px; background: var(--surface-2); border-bottom: 1px solid var(--border); }
.citation-hdr span { font-size: .75rem; font-weight: 600; color: var(--text-3); }
.copy-btn { display: inline-flex; align-items: center; gap: 5px; padding: 5px 12px;
  border-radius: 6px; font-size: .75rem; font-weight: 600; background: transparent;
  border: 1px solid var(--border); color: var(--text-2); cursor: pointer; transition: all .15s; }
.copy-btn:hover { border-color: var(--blue); color: var(--blue); }
.citation-body { padding: 20px 22px; }
.citation-body pre { font-family: 'JetBrains Mono', monospace; font-size: .8rem;
  color: var(--text-2); white-space: pre-wrap; line-height: 1.7; margin: 0; }

/* ════════════════════════════════ FOOTER ═══ */
footer { background: var(--hero-bg); border-top: 1px solid rgba(255,255,255,.06); padding: 48px 24px; text-align: center; }
.footer-brand { font-weight: 800; font-size: 1.05rem; color: rgba(255,255,255,.55); margin-bottom: 14px; }
.footer-brand span { color: #60a5fa; }
.footer-links { display: flex; gap: 4px; justify-content: center; margin-bottom: 18px; flex-wrap: wrap; }
.footer-links a { font-size: .82rem; color: rgba(255,255,255,.38); text-decoration: none;
  padding: 4px 10px; border-radius: 6px; transition: color .15s; }
.footer-links a:hover { color: rgba(255,255,255,.75); }
.footer-copy { font-size: .76rem; color: rgba(255,255,255,.5); }
.footer-copy a { color: rgba(255,255,255,.32); text-decoration: none; }
.footer-copy a:hover { color: rgba(255,255,255,.6); }

/* ════════════════════════════════ QUALITATIVE GALLERY ═══ */
#qualitative { background: var(--surface-2); padding: 80px 0; }
.qual-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.qual-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.qual-pair { display: grid; grid-template-columns: 1fr 1fr; }
.qual-img { position: relative; }
.qual-img img { width: 100%; height: 160px; object-fit: cover; display: block; }
.qual-lbl {
  position: absolute; bottom: 6px; left: 6px;
  background: rgba(0,0,0,.55); color: #fff;
  font-size: .68rem; font-weight: 700; letter-spacing: .05em;
  padding: 2px 7px; border-radius: 4px;
  pointer-events: none;
}
.qual-info {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-top: 1px solid var(--border);
}
.qual-placeholder {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  padding: 64px 24px; color: var(--text-3); text-align: center;
  border: 2px dashed var(--border); border-radius: var(--radius); margin-top: 40px;
}
.qual-placeholder i { font-size: 2rem; opacity: .4; }
.qual-placeholder span { font-size: .9rem; max-width: 480px; line-height: 1.6; }
.qual-name { font-size: .84rem; font-weight: 600; color: var(--text-1); }
.qual-id   { font-size: .75rem; color: var(--text-3); font-family: 'JetBrains Mono', monospace; }

/* RGB + Semantic annotation gallery */
.annot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}
.annot-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.annot-bld-lbl {
  padding: 8px 12px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--text-3);
  border-bottom: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
}
.annot-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.annot-img-wrap {
  position: relative;
}
.annot-img-wrap img {
  width: 100%;
  display: block;
  aspect-ratio: 3/2;
  object-fit: cover;
}
.annot-tag {
  position: absolute;
  bottom: 6px;
  left: 6px;
  background: rgba(0,0,0,.65);
  color: #fff;
  backdrop-filter: blur(4px);
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .06em;
  padding: 2px 7px;
  border-radius: 3px;
  pointer-events: none;
}
@media(max-width: 768px) { .annot-grid { grid-template-columns: 1fr; } }

/* Animated fly-through cards */
.anim-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.anim-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.anim-video-wrap { position: relative; }
.anim-video-wrap video { width: 100%; display: block; aspect-ratio: 16/9; object-fit: cover; }
.anim-lbl {
  position: absolute; bottom: 8px; left: 8px;
  background: rgba(0,0,0,.6); color: #fff; backdrop-filter: blur(4px);
  font-size: .68rem; font-weight: 700; letter-spacing: .05em;
  padding: 3px 8px; border-radius: 4px; pointer-events: none;
}
@media(max-width: 768px) { .anim-grid { grid-template-columns: 1fr; } }

/* ════════════════════════════════ CONDITIONS GRID ═══ */
.cond-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cond-card { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.cond-card img { width: 100%; height: 150px; object-fit: cover; display: block; }
.cond-label {
  text-align: center; font-size: .8rem; font-weight: 600;
  color: var(--text-2); padding: 8px; background: var(--surface);
}

/* Dataset comparison */
.row-ours td { background: var(--blue-t); }
.row-ours td:first-child { border-left: 3px solid var(--blue); }
.cmp-group-hdr td {
  background: var(--surface-2); font-size: .74rem; font-weight: 700;
  color: var(--text-3); text-transform: uppercase; letter-spacing: .06em;
  padding: 6px 14px;
}

/* ════════════════════════════════ SCROLL TOP ═══ */
.scroll-top { position: fixed; bottom: 24px; right: 24px; z-index: 500;
  width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-2); display: flex; align-items: center;
  justify-content: center; cursor: pointer; font-size: .8rem;
  opacity: 0; pointer-events: none; transition: all .25s;
  box-shadow: 0 4px 16px rgba(0,0,0,.1); }
.scroll-top.visible { opacity: 1; pointer-events: auto; }
.scroll-top:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-2px); }

/* ════════════════════════════════ RESPONSIVE ═══ */
@media(max-width: 1100px) { .video-grid { grid-template-columns: repeat(2, 1fr); } }
@media(max-width: 1024px) {
  .geo-layout { grid-template-columns: 1fr; }
  #coverageMap { height: 360px; }
  .geo-panel   { height: auto; min-height: 0; }
  .cmp-grid    { grid-template-columns: 1fr; max-width: 500px; margin-left: auto; margin-right: auto; }
  .dv-canvases { height: 420px; }
}
@media(max-width: 900px) {
  .qual-grid { grid-template-columns: 1fr; }
  .cond-grid { grid-template-columns: repeat(3, 1fr); }
}
@media(max-width: 560px) {
  .cond-grid { grid-template-columns: repeat(2, 1fr); }
}
@media(max-width: 768px) {
  .hero-stats { flex-direction: column; }
  .hero-stat  { border-right: none; border-bottom: 1px solid rgba(255,255,255,.07); }
  .hero-stat:last-child { border-bottom: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links, .nav-actions { display: none; }
  .nav-burger { display: flex; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
}
@media(max-width: 480px) {
  .hero-btns  { flex-direction: column; align-items: center; }
  .video-grid { grid-template-columns: 1fr; }
}