/* SpaRV project page. Layout follows the Neural Harmonic Textures page:
   one centred column, Lato, centred section headings, rounded figures. */

:root {
  --ink: #1f2328;
  --muted: #59636e;
  --line: #e1e4e8;
  --soft: #f6f8fa;
  --link: #1772d0;
  --link-hover: #f09228;
  --accent: #0b57d0;
  --ours-bg: #eef4fd;
  --btn: #24292f;
  --btn-off: #d8dee4;
  --btn-off-ink: #6e7781;
  --radius: 8px;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: 'Lato', Verdana, Helvetica, sans-serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); }

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------------------------------------------------------------- top bar */

.topbar {
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.topbar .page {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  padding-bottom: 10px;
}
.topbar nav { display: flex; flex-wrap: wrap; gap: 4px 16px; color: var(--muted); }

/* ----------------------------------------------------------------- header */

header.paper { text-align: center; padding: 36px 0 8px; }
header.paper p { text-align: center; }

h1 {
  font-size: 34px;
  font-weight: 400;
  line-height: 1.25;
  margin: 0 0 18px;
}
h1 .acronym { font-weight: 700; color: var(--accent); }

.authors { font-size: 18px; margin: 0 auto 6px; max-width: 820px; }
.authors span { white-space: nowrap; }
.affil { font-size: 17px; color: var(--muted); margin: 0; }
.venue { font-size: 17px; color: var(--muted); font-style: italic; margin: 4px 0 0; }

.buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 22px 0 6px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 18px;
  border-radius: 999px;
  background: var(--btn);
  color: #fff;
  font-size: 16px;
  line-height: 1.4;
}
.btn:hover { color: #fff; background: #000; }
.btn svg { width: 17px; height: 17px; fill: currentColor; flex: none; }
.btn.is-disabled {
  background: var(--btn-off);
  color: var(--btn-off-ink);
  pointer-events: none;
}
.btn .soon { font-size: 12px; opacity: .9; }
.btn:not(.is-disabled) .soon { display: none; }

/* --------------------------------------------------------------- sections */

section { padding: 12px 0 8px; }

h2 {
  font-size: 26px;
  font-weight: 400;
  text-align: center;
  margin: 28px 0 4px;
}
h2 + hr { border: 0; border-top: 1px solid var(--line); margin: 6px 0 18px; }

h3 {
  font-size: 21px;
  font-weight: 700;
  text-align: center;
  margin: 34px 0 10px;
}
h3.left { text-align: left; }
h3 .num {
  display: inline-block;
  min-width: 28px;
  height: 28px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  line-height: 28px;
  text-align: center;
  vertical-align: 2px;
}

p { margin: 0 0 14px; text-align: justify; hyphens: auto; }

.lead { font-size: 18px; text-align: center; max-width: 820px; margin: 18px auto 6px; }

/* ---------------------------------------------------------------- figures */

figure { margin: 18px 0 22px; }
figure img, figure video { display: block; width: 100%; height: auto; border-radius: var(--radius); }
figure.diagram img { border-radius: 0; }
figure.narrow { max-width: 760px; margin-left: auto; margin-right: auto; }
figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}
figcaption b { color: var(--ink); }

.grid { display: grid; gap: 10px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid figure { margin: 0; }
.grid figcaption { text-align: center; margin-top: 4px; }
@media (max-width: 640px) {
  .grid.cols-2 { grid-template-columns: 1fr; }
  .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
}

.hint { color: var(--muted); font-size: 14px; text-align: center; margin: 6px 0 16px; }

/* ------------------------------------------------- segmented tab buttons */

.seg {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin: 10px 0 12px;
  padding: 0;
  list-style: none;
}
.seg button {
  font: inherit;
  font-size: 15px;
  padding: 4px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}
.seg button:hover { border-color: #b6bec7; }
.seg button.active { background: var(--btn); border-color: var(--btn); color: #fff; }
.seg .seg-label { align-self: center; color: var(--muted); font-size: 14px; margin-right: 4px; }
.seg-row { display: flex; flex-wrap: wrap; justify-content: center; column-gap: 28px; }
.seg-row .seg { margin-bottom: 4px; }

.pane[hidden] { display: none; }

/* ------------------------------------------- comparison sliders (img/video) */

.cmp {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--soft);
  user-select: none;
  -webkit-user-select: none;
  touch-action: pan-y;
  cursor: ew-resize;
}
/* low-resolution renders: do not upscale them across the full column */
.cmp.narrow { max-width: 720px; margin-left: auto; margin-right: auto; }
#teaser .cmp { max-width: 820px; margin: 0 auto; }
/* every .cmp carries an inline aspect-ratio, so videos do not reflow on load */
.cmp-layer { position: absolute; inset: 0; }
.cmp-layer img, .cmp-layer video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  pointer-events: none;
}

.cmp-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  margin-left: -1px;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, .25);
  outline: none;
}
.cmp-handle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 34px;
  height: 34px;
  margin: -17px 0 0 -17px;
  border-radius: 50%;
  background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 6l-6 6 6 6M15 6l6 6-6 6' fill='none' stroke='%2324292f' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 20px no-repeat;
  box-shadow: 0 1px 4px rgba(0, 0, 0, .35);
}
.cmp-handle:focus-visible::after { box-shadow: 0 0 0 3px var(--accent); }

.cmp-label {
  position: absolute;
  bottom: 10px;
  transform: translateX(-50%);
  padding: 1px 9px;
  border-radius: 4px;
  background: rgba(0, 0, 0, .58);
  color: #fff;
  font-size: 14px;
  white-space: nowrap;
  pointer-events: none;
  transition: opacity .15s;
}
.cmp-label.ours { background: rgba(11, 87, 208, .85); }
.cmp-label.hide { opacity: 0; }
@media (max-width: 640px) { .cmp-label { font-size: 12px; bottom: 6px; } }

details.fold { margin: 10px 0 0; }
details.fold summary {
  cursor: pointer;
  color: var(--link);
  font-size: 15px;
  text-align: center;
  list-style: none;
}
details.fold summary::-webkit-details-marker { display: none; }
details.fold summary::before { content: "\25B8  "; }
details.fold[open] summary::before { content: "\25BE  "; }
details.fold .cmp { margin-top: 10px; }

/* ------------------------------------------------------------- video embed */

.embed {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  background: var(--soft);
  border: 1px dashed #c9d1d9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  text-align: center;
  padding: 16px;
}
.embed:not(.has-video) { aspect-ratio: auto; min-height: 120px; }
.embed.has-video { border: 0; background: #000; padding: 0; }
.embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: var(--radius); }

/* ------------------------------------------------------------------ tables */

.tbl { overflow-x: auto; margin: 14px 0 22px; }
table {
  border-collapse: collapse;
  margin: 0 auto;
  font-size: 15px;
  line-height: 1.35;
  font-variant-numeric: tabular-nums;
  min-width: min(100%, 480px);
}
caption {
  caption-side: top;
  color: var(--muted);
  font-size: 15px;
  padding-bottom: 8px;
  text-align: center;
}
th, td { padding: 5px 10px; text-align: center; white-space: nowrap; }
thead tr:first-child th { border-top: 2px solid var(--ink); }
thead tr:last-child th { border-bottom: 1px solid var(--ink); }
tbody tr:last-child td { border-bottom: 2px solid var(--ink); }
th { font-weight: 700; }
th.l, td.l { text-align: left; }
th.metric { font-weight: 400; color: var(--muted); }
tr.ours td { background: var(--ours-bg); }
tr.ours td.l { font-weight: 700; }
tr.group td {
  font-style: italic;
  color: var(--muted);
  padding-top: 8px;
  border-bottom: 1px solid var(--line);
}
td b { font-weight: 700; }
td u { text-decoration-thickness: 1px; text-underline-offset: 2px; }
.tbl-note { color: var(--muted); font-size: 14px; text-align: center; margin: -12px 0 22px; }

/* ------------------------------------------------------------------ bibtex */

.bib { position: relative; }
.bib pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.5;
}
.bib button {
  position: absolute;
  top: 10px;
  right: 10px;
  font: inherit;
  font-size: 13px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
}

footer {
  margin-top: 40px;
  padding: 18px 0 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 26px; }
  .authors { font-size: 16px; }
  h2 { font-size: 23px; }
  h3 { font-size: 19px; }
  p { text-align: left; }
}