/* Spectral World Renderer project page.
   Layout after the Nerfies / LongSplat academic template (white page, centred ~960 px column),
   written as self-contained CSS so that the page renders without Bulma or icon fonts. */
:root{
  --accent:#12897C;          /* links, active tabs (teal, 4.6:1 on white) */
  --accent-strong:#0B6F64;
  --teal:#3FD1C0;--amber:#F2B24C;--navy:#0B1426;
  --text:#363636;--strong:#222;--muted:#5F6672;--line:#E4E7EB;--band:#F5F5F5;
  --dark-btn:#363636;--dark-btn-hover:#1F1F1F;
  --sans:"Noto Sans",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --display:"Google Sans","Noto Sans",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --col:960px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:var(--text);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
img,video,iframe{display:block;max-width:100%}
img{height:auto}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-strong);text-decoration:underline}
h1,h2,h3,h4{font-family:var(--display);color:var(--strong);margin:0;line-height:1.2;font-weight:500}
p{margin:0 0 1em}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:3px solid #F2B24C;outline-offset:2px;border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--strong);color:#fff;padding:8px 14px;border-radius:6px}
.skip:focus{top:12px;color:#fff}
.container{max-width:var(--col);margin:0 auto;padding:0 24px}
.center{text-align:center}

/* Hero */
.hero{padding:48px 0 8px;text-align:center}
.pub-title{font-size:clamp(2.3rem,6vw,4.1rem);font-weight:500;letter-spacing:-.01em;display:flex;align-items:center;justify-content:center;gap:.3em;flex-wrap:wrap}
.pub-title .logo{width:1.05em;height:1.05em;flex:none}
.pub-subtitle{font-size:clamp(1.25rem,2.6vw,1.75rem);font-weight:700;margin:12px auto 22px;max-width:820px}
.authors,.affils{list-style:none;padding:0;margin:0 auto;display:flex;flex-wrap:wrap;justify-content:center;font-family:var(--display)}
.authors{font-size:1.25rem;gap:2px 0;max-width:860px}
.authors li:not(:last-child)::after{content:",";color:var(--text);margin-right:.45em}
.authors .name{color:var(--accent);text-decoration:none}
.authors a.name:hover,.authors a.name:focus-visible{text-decoration:underline}
.authors sup,.affils sup{font-size:.62em;margin-left:1px}
.affils{font-size:1.05rem;gap:2px 18px;margin-top:6px;color:var(--text)}
.affils sup{margin-right:2px}
.venue{font-family:var(--display);font-size:1.3rem;font-weight:700;color:var(--strong);margin:16px 0 18px}
.links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:8px}
.pill{display:inline-flex;align-items:center;gap:7px;height:2.5em;padding:0 1.15em;border-radius:290486px;background:var(--dark-btn);color:#fff;font-size:1rem;font-family:var(--sans);border:0;line-height:1;white-space:nowrap}
.pill:hover{background:var(--dark-btn-hover);color:#fff;text-decoration:none}
.pill svg{width:1.05em;height:1.05em;flex:none}
.pill[aria-disabled="true"]{background:#6B6B6B;cursor:not-allowed}
.pill small{font-size:.72em;opacity:.85}

/* Teaser */
.teaser{padding:22px 0 30px}
.tagline{font-size:clamp(1.45rem,3.2vw,2rem);font-weight:700;text-align:center;margin:0 0 18px}
.tagline .hl{color:var(--accent)}
.teaser figcaption,.caption{font-size:.95rem;color:var(--muted);text-align:center;margin:12px auto 0;max-width:880px;line-height:1.55}
figure{margin:0}
figcaption b{color:var(--strong)}

/* Grey carousel band */
.band{background:var(--band);padding:28px 0 22px}
.carousel{position:relative;max-width:1200px;margin:0 auto;padding:0 56px}
.track{display:grid;grid-auto-flow:column;grid-auto-columns:calc((100% - 32px)/3);gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;scrollbar-width:none;padding:4px}
.track::-webkit-scrollbar{display:none}
.slide{scroll-snap-align:start;background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.08);display:flex;flex-direction:column}
.slide img{aspect-ratio:16/9;object-fit:cover;width:100%;background:#ddd}
.slide .body{padding:10px 14px 12px;display:flex;flex-direction:column;gap:6px;flex:1}
.slide h3{font-size:1.05rem;font-weight:700}
.slide .meta{font-size:.85rem;color:var(--muted)}
.slide button{margin-top:auto;align-self:flex-start;border:0;background:none;padding:2px 0;color:var(--accent);font-size:.9rem}
.slide button:hover{text-decoration:underline}
.slide button[disabled]{color:var(--muted);cursor:default;text-decoration:none}
.nav-btn{position:absolute;top:calc(50% - 22px);width:40px;height:40px;border-radius:50%;border:0;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.18);display:grid;place-items:center;color:var(--strong)}
.nav-btn:hover{background:#f0f0f0}
.nav-btn svg{width:18px;height:18px}
.nav-btn.prev{left:8px}.nav-btn.next{right:8px}
.dots{display:flex;justify-content:center;gap:8px;margin-top:14px}
.dots button{width:9px;height:9px;border-radius:50%;border:0;padding:0;background:#C7CCD3}
.dots button[aria-current="true"]{background:var(--accent)}

/* Sections */
.section{padding:40px 0 8px}
.section > .container > h2,.sec-title{font-size:2rem;font-weight:500;padding-bottom:10px;border-bottom:1px solid var(--line);margin-bottom:22px}
.section.abstract h2{text-align:center;border-bottom:0;padding-bottom:0;margin-bottom:14px}
.abstract p.body{text-align:justify;font-size:1rem}
h3.sub{font-size:1.45rem;font-weight:500;margin:34px 0 12px}
.lead{color:var(--text)}
.text-block{text-align:justify}
.highlights{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:20px}
.highlights div{border:1px solid var(--line);border-radius:8px;padding:12px 14px;text-align:center}
.highlights b{display:block;font-family:var(--display);font-size:1.55rem;font-weight:500;color:var(--strong);line-height:1.2}
.highlights span{font-size:.85rem;color:var(--muted);line-height:1.4;display:block;margin-top:4px}
.fig{margin:6px 0 4px}
.fig img{width:100%}
.fig figcaption{font-size:.92rem;color:var(--muted);text-align:justify;margin-top:10px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:16px 0 8px}
.steps div{border-left:3px solid var(--teal);padding:2px 0 2px 12px}
.steps h4{font-size:1.05rem;font-weight:700;margin-bottom:4px}
.steps p{font-size:.93rem;margin:0}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:center;margin-top:18px}
.split>*{min-width:0}
.zoom{display:block;border:0;padding:0;background:none;cursor:zoom-in;width:100%}

/* Video */
.video-wrap{position:relative;width:100%;aspect-ratio:16/9;background:#000;border-radius:6px;overflow:hidden}
.video-wrap img,.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border:0}
.play{position:absolute;inset:0;border:0;background:rgba(0,0,0,.18);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:#fff}
.play .yt{width:68px;height:48px;border-radius:12px;background:#E62117;display:grid;place-items:center;transition:transform .15s}
.play:hover .yt{transform:scale(1.07)}
.play .yt svg{width:24px;height:24px}
.play span.t{font-size:.95rem;text-shadow:0 1px 3px rgba(0,0,0,.6)}
.play[hidden]{display:none}

/* Tabs in the reference style */
.tabs{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin:10px 0 14px}
.tabs.left{justify-content:flex-start}
.tabs button{border:0;background:none;color:var(--accent);padding:6px 12px;border-radius:4px;font-size:.95rem;line-height:1.3}
.tabs button:hover{background:#EEF7F6}
.tabs button[aria-selected="true"],.tabs button[aria-pressed="true"]{background:var(--accent);color:#fff}
.tabs .sep{width:1px;background:var(--line);margin:4px 6px}
.hint{font-size:.88rem;color:var(--muted);text-align:center;margin:8px 0}

/* Material query player with RGB comparison */
.player{position:relative;border-radius:6px;overflow:hidden;background:#111;aspect-ratio:16/9}
.player video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.player .rgb-layer{clip-path:inset(0 calc(100% - var(--split,50%)) 0 0)}
.player .rgb-layer[hidden]{display:none}
.divider{position:absolute;top:0;bottom:0;left:var(--split,50%);width:2px;margin-left:-1px;background:#fff;box-shadow:0 0 6px rgba(0,0,0,.5);pointer-events:none}
.divider span{position:absolute;top:50%;left:50%;width:34px;height:34px;margin:-17px 0 0 -17px;border-radius:50%;background:#fff;color:var(--strong);display:grid;place-items:center;font-size:15px;box-shadow:0 1px 6px rgba(0,0,0,.35)}
.player input[type=range]{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize}
.player .label{position:absolute;top:10px;font-size:.8rem;color:#fff;background:rgba(0,0,0,.55);padding:2px 9px;border-radius:4px;pointer-events:none}
.player .label.l{left:10px}.player .label.r{right:10px}
.player .query-chip{position:absolute;left:50%;bottom:12px;transform:translateX(-50%);display:flex;align-items:center;gap:8px;background:rgba(11,20,38,.88);color:#fff;border:2px solid var(--qc,var(--teal));border-radius:999px;padding:4px 14px 4px 10px;font-size:.92rem;pointer-events:none;white-space:nowrap}
.player .query-chip .qi svg{width:16px;height:16px;display:block;color:var(--qc,var(--teal))}
.player .query-chip svg.or,.qchip svg.or{width:.72em;height:.72em;margin:0 .22em;vertical-align:-.02em;color:var(--qc,var(--teal))}
/* Click crosshair (query colour over a dark underlay; the clicked point itself stays visible) */
.player .xhair{position:absolute;width:64px;height:64px;transform:translate(-50%,-50%);pointer-events:none;overflow:visible}
.xhair circle,.xhair path{fill:none}
.xhair .under{stroke:rgba(0,0,0,.6);stroke-width:6}
.xhair .over{stroke:var(--qc);stroke-width:3}
.xhair .dot{fill:#fff;stroke:rgba(0,0,0,.6);stroke-width:1}
.xhair .pulse{stroke:var(--qc);stroke-width:3;transform-origin:0 0;animation:xpulse 1.6s ease-out infinite}
@keyframes xpulse{from{transform:scale(.7);opacity:.9}to{transform:scale(2.6);opacity:0}}
/* Reference-spectrum card (spectrum queries) */
.player .spec-card{position:absolute;left:10px;bottom:12px;width:132px;padding:6px 8px 5px;border-radius:8px;background:rgba(11,20,38,.88);border:2px solid var(--qc);color:#fff;pointer-events:none;font-size:.7rem;line-height:1.25}
.spec-card svg{display:block;width:100%;height:auto}
.spec-card .base{stroke:rgba(255,255,255,.35);stroke-width:1.2;fill:none}
.spec-card .curve{stroke:var(--qc);stroke-width:2.6;fill:none;stroke-linejoin:round;stroke-linecap:round}
.spec-card .ref{display:block;font-weight:700}
.spec-card .ax{display:block;color:rgba(255,255,255,.75)}
/* Mode-tagged query chips: outline and icon share the query colour; icons sit on navy for contrast. */
.qchips{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px 14px;margin:10px 0 14px}
.qgroup{display:inline-flex;flex-wrap:wrap;align-items:center;gap:6px}
.mode-tag{font-size:.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-right:2px}
.qchip{display:inline-flex;align-items:center;gap:7px;border:2px solid var(--qc);background:#fff;color:var(--strong);border-radius:999px;padding:3px 12px 3px 4px;font-size:.92rem;line-height:1.3;white-space:nowrap}
.qchip .qi{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--navy)}
.qchip .qi svg{width:15px;height:15px;color:var(--qc)}
.qchip[data-chip="rgb"]{border-color:#C9CED6}
.qchip:hover{background:#F3F5F8}
.qchip[aria-pressed="true"]{background:var(--navy);color:#fff;box-shadow:0 0 0 2px #fff,0 0 0 4px var(--qc)}
.qchip[aria-pressed="true"][data-chip="rgb"]{box-shadow:0 0 0 2px #fff,0 0 0 4px #8A93A3}
.player .status{position:absolute;right:10px;bottom:12px;font-size:.78rem;color:#fff;background:rgba(0,0,0,.55);padding:2px 8px;border-radius:4px}
.player .status[hidden],.player [hidden]{display:none}
.player:focus-within{outline:3px solid #F2B24C;outline-offset:2px}
.thumbs{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:6px}
.thumbs button{border:2px solid transparent;border-radius:6px;padding:0;background:none;width:96px;overflow:hidden;opacity:.75;transition:opacity .15s}
.thumbs button:hover{opacity:1}
.thumbs button[aria-pressed="true"]{border-color:var(--accent);opacity:1}
.thumbs img{width:100%;aspect-ratio:16/9;object-fit:cover}
.thumbs span{display:block;font-size:.72rem;color:var(--text);padding:2px 0 3px;background:#fff}
.desc{font-size:.92rem;color:var(--muted);margin-top:10px;text-align:center}

.pp{position:absolute;right:10px;top:10px;width:34px;height:34px;border-radius:50%;border:0;background:rgba(0,0,0,.55);color:#fff;font-size:12px;display:grid;place-items:center;z-index:2}
.pp:hover{background:rgba(0,0,0,.75)}
.player .label.r{right:52px}
.player .status{right:52px}

/* Tables and bars */
.table-wrap{overflow-x:auto;margin:6px 0}
table{border-collapse:collapse;width:100%;font-size:.95rem;font-variant-numeric:tabular-nums}
caption{caption-side:bottom;text-align:left;font-size:.85rem;color:var(--muted);padding-top:8px}
th,td{padding:7px 12px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{border-bottom:2px solid #C9CED6;font-weight:700;color:var(--strong)}
tbody th{font-weight:500}
.ours{background:#EEF8F6}
td.best{font-weight:700;color:var(--strong)}
td.best::after{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--amber);margin-left:5px;vertical-align:middle}
tr.mean td,tr.mean th{font-weight:700;border-top:2px solid #C9CED6}
.setting{color:var(--muted);font-size:.8rem;margin-left:6px}
.short{display:none}
.two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;margin-top:8px}
.two>*{min-width:0}
.hbars{display:flex;flex-direction:column;gap:10px;margin:8px 0 14px}
.hbar{display:grid;grid-template-columns:128px minmax(0,1fr);gap:10px;align-items:center;font-size:.88rem}
.hbar .track2{position:relative;height:22px;background:#F0F2F4;border-radius:4px}
.hbar .fill{position:absolute;left:0;top:0;bottom:0;border-radius:4px;background:#B4BCC8;min-width:3px}
.hbar.ours-row .fill{background:var(--accent)}
.hbar.ours-row .name{font-weight:700;color:var(--strong)}
.hbar .val{position:absolute;left:calc(var(--w) + 6px);top:50%;transform:translateY(-50%);font-size:.82rem;font-weight:700;white-space:nowrap}
.hbar .val.inside{left:auto;right:6px;color:#fff}
.small-label{font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:10px}
.mini th,.mini td{padding:6px 8px;font-size:.88rem}
.row-sub{display:block;font-size:.75rem;color:var(--muted);font-weight:400}
b.win{color:var(--accent-strong)}
.fine{font-size:.82rem;color:var(--muted)}
ul.points{padding-left:1.2em;margin:10px 0 0}
ul.points li{margin-bottom:4px}

/* Citation */
.bib{position:relative;background:#F5F5F5;border-radius:4px;padding:18px 20px}
.bib pre{margin:0;font:.88rem/1.6 var(--mono);color:#333;overflow-x:auto;white-space:pre}
.copy{position:absolute;top:10px;right:10px;border:1px solid #D0D4DA;background:#fff;border-radius:4px;font-size:.8rem;padding:3px 10px}
.copy:hover{border-color:var(--accent)}
footer{padding:36px 0 40px;text-align:center;font-size:.88rem;color:var(--muted)}
footer p{margin:0}

/* Lightbox */
dialog.lightbox{border:0;padding:0;background:transparent;max-width:96vw;max-height:94vh}
dialog.lightbox::backdrop{background:rgba(0,0,0,.85)}
dialog.lightbox img{max-width:96vw;max-height:90vh;width:auto;background:#fff;border-radius:4px}
dialog.lightbox .close{position:fixed;top:12px;right:12px;width:40px;height:40px;border-radius:50%;border:0;background:#fff;font-size:22px;line-height:1}

@media (max-width:900px){
  .track{grid-auto-columns:calc((100% - 16px)/2)}
  .highlights{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:700px){
  .two,.split,.steps{grid-template-columns:1fr}
  .carousel{padding:0 16px}
  .track{grid-auto-columns:82%}
  .nav-btn{display:none}
}
@media (max-width:600px){
  .container{padding:0 16px}
  .hero{padding-top:32px}
  .authors{font-size:1.05rem}
  .affils{font-size:.9rem;flex-direction:column}
  .venue{font-size:1.1rem}
  .pill{font-size:.9rem;padding:0 .95em}
  .section > .container > h2,.sec-title{font-size:1.6rem}
  .abstract p.body,.text-block,.fig figcaption{text-align:left}
  th,td{padding:6px 6px;font-size:.85rem}
  th .long{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
  th .short{display:inline}
  .setting{display:none}
  .mini th,.mini td{padding:6px 4px;font-size:.8rem}
  .hbar{grid-template-columns:96px minmax(0,1fr);font-size:.8rem}
  .thumbs button{width:76px}
  .player .label{font-size:.7rem}
  .player .query-chip{font-size:.8rem;bottom:8px}
  .player .xhair{width:44px;height:44px}
  .player .spec-card{width:96px;font-size:.62rem;bottom:auto;top:40px;padding:4px 6px}
  .qchips{gap:6px 10px}
  .qchip{font-size:.85rem}
  .bib pre{white-space:pre-wrap;word-break:break-word;font-size:.78rem}
  .copy{position:static;margin-bottom:8px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.track{scroll-behavior:auto}*{transition:none!important}.xhair .pulse{animation:none;opacity:0}}

.related{list-style:none;padding:0;margin:1rem 0 0}.related li{padding:.7rem 0;border-top:1px solid #eee;line-height:1.55}.related li:last-child{border-bottom:1px solid #eee}.related .venue{color:var(--accent);font-weight:500;margin-right:.25em}.lead-in{margin:0}

/* Readability pass: teaser lead and query-mode legend */
.tagline-sub{max-width:760px;margin:-8px auto 18px;text-align:center;color:var(--muted);font-size:1.05rem;line-height:1.55}
.tagline-sub a{white-space:nowrap;font-weight:600}
.lead-short{max-width:860px;margin:0 auto 10px;text-align:center;line-height:1.6}
.modes{list-style:none;padding:0;margin:0 auto 6px;display:flex;flex-wrap:wrap;justify-content:center;gap:6px 18px;max-width:980px;font-size:.92rem;color:var(--muted)}
.modes b{color:var(--strong);font-weight:600;margin-right:.25em}
@media (max-width:600px){.modes{flex-direction:column;align-items:flex-start;gap:4px;padding:0 4px}.lead-short{text-align:left}.tagline-sub{font-size:.98rem}}