/* Classic academic style: white page, centred column, serif headings. */
:root {
  --bg: #ffffff;
  --ink: #16181d;
  --ink-2: #3b414c;
  --muted: #727885;
  --rule: #e5e7ec;
  --soft: #f2f3f6;
  --accent: #2a5fc0;
  --ours: #2a63cb;
  --ours-soft: #f0f5ff;
  --b0: #d9dde4;
  --b1: #b5bcc8;
  --b2: #8d96a5;
  --panel-bg: radial-gradient(120% 95% at 50% 18%, #ffffff 0%, #f1f2f5 62%, #e9ebf0 100%);
  --panel-label-bg: rgba(255, 255, 255, .82);
  --radius: 12px;
  --font-ui: "Source Sans 3", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --s1: #e6eff9; --s1-ink: #2b5d98;
  --s2: #fcede0; --s2-ink: #a0561e;
  --s3: #f8e6f1; --s3-ink: #93417a;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 18px/1.65 var(--font-ui);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
img, video { max-width: 100%; }
::selection { background: #dbe7ff; }

.wrap { max-width: 1000px; margin: 0 auto; padding: 0 24px; }
.wrap-wide { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 800px; margin-left: auto; margin-right: auto; }

/* ---------- header ---------- */
.masthead { padding: 76px 0 8px; text-align: center; }
.title { margin: 0; font-family: var(--font-serif); color: var(--ink); }
.title-name {
  display: block; font-size: clamp(46px, 7.4vw, 72px); font-weight: 600; line-height: 1.02;
  letter-spacing: -.02em; font-variation-settings: "opsz" 60;
}
.title-sub {
  display: block; max-width: 900px; margin: 14px auto 0;
  font-size: clamp(21px, 2.9vw, 30px); font-weight: 400; line-height: 1.25; color: var(--ink-2);
  letter-spacing: -.005em; font-variation-settings: "opsz" 32;
}
.authors {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 22px;
  margin: 34px auto 0; padding: 0; list-style: none; max-width: 980px;
  font-size: 19px; font-weight: 600; color: var(--ink);
}
.authors sup, .affils sup { font-size: .62em; font-weight: 600; color: var(--muted); margin-left: 1px; }
.affils {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 2px 20px;
  margin: 10px auto 0; padding: 0; list-style: none; font-size: 16px; color: var(--ink-2);
}
.corr { margin: 8px 0 0; font-size: 13.5px; color: var(--muted); }

.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin: 28px 0 0; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 19px 10px 15px;
  border-radius: 999px; background: var(--ink); color: #fff; text-decoration: none;
  font: 600 15.5px/1 var(--font-ui); letter-spacing: .005em;
  transition: transform .15s, background .15s, box-shadow .15s;
}
.btn:hover { background: #000; transform: translateY(-1px); box-shadow: 0 6px 16px -8px rgba(0,0,0,.45); }
.btn svg { width: 17px; height: 17px; flex: none; }
.btn.is-soon { background: var(--soft); color: var(--muted); box-shadow: none; transform: none; }
.btn .soon {
  font: 700 9.5px/1 var(--font-ui); text-transform: uppercase; letter-spacing: .08em;
  padding: 4px 6px; border-radius: 999px; background: #fff; color: var(--muted); margin-left: 1px;
}

/* ---------- teaser ---------- */
.teaser { margin: 48px auto 0; }
.teaser-frame {
  position: relative; border-radius: 14px; overflow: hidden; background: #fff;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 18px 40px -18px rgba(16, 24, 40, .28);
}
.teaser-frame video { display: block; width: 100%; height: auto; aspect-ratio: 1828 / 390; background: #f4f4f4; }
.teaser-rows { position: absolute; left: 10px; top: 0; bottom: 0; display: grid; grid-template-rows: 1fr 1fr; pointer-events: none; }
.teaser-rows span {
  align-self: start; margin-top: 9px; font: 700 10.5px/1 var(--font-ui); letter-spacing: .08em; text-transform: uppercase;
  color: #fff; background: rgba(15, 17, 22, .55); padding: 5px 7px; border-radius: 999px;
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}
.teaser-labels {
  display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); column-gap: calc(100% * 6 / 1828);
  margin-top: 12px; font: 600 14px var(--font-ui); color: var(--ink-2); text-align: center;
}
.teaser figcaption { max-width: 780px; margin: 18px auto 0; text-align: center; font-size: 16.5px; line-height: 1.6; color: var(--ink-2); }

/* ---------- sections ---------- */
section { padding: 64px 0 8px; }
.h2 {
  margin: 0 0 30px; text-align: center; font: 600 34px/1.15 var(--font-serif);
  letter-spacing: -.012em; font-variation-settings: "opsz" 40;
}
.h2::after { content: ""; display: block; width: 36px; height: 3px; margin: 16px auto 0; border-radius: 2px; background: var(--accent); opacity: .85; }
.h3 { margin: 0 0 8px; font: 600 24px/1.25 var(--font-serif); letter-spacing: -.008em; font-variation-settings: "opsz" 28; }
.lead { margin: 0 0 24px; color: var(--ink-2); font-size: 17px; }
#abstract { padding-top: 48px; scroll-margin-top: 58px; }
.method-stage { padding: 56px 0; }
.method-stage-1 { margin-top: 48px; background: #eef4fc; }
.method-stage-2 { background: #fff4e9; }
.method-stage .fig img { mix-blend-mode: multiply; }
.method-stage-label {
  display: inline-flex; padding: 8px 14px; border-radius: 999px; background: rgba(255,255,255,.8);
  font: 700 12px/1 var(--font-ui); letter-spacing: .1em; text-transform: uppercase; color: var(--s1-ink);
}
.method-stage-2 .method-stage-label { color: var(--s2-ink); }
.method-stage .feature { margin-top: 24px; }
.method-stage .result { margin-top: 56px; }
.method-stage-2 #transfer { margin-top: 24px; }
.wrap.real-world-section { padding-top: 64px; }
.abstract p { margin: 0; text-align: justify; hyphens: auto; -webkit-hyphens: auto; font-size: 18px; line-height: 1.72; }
.abstract p + p { margin-top: 1em; }

.fig { margin: 0; }
.fig img { display: block; width: 100%; height: auto; }
.fig figcaption { margin-top: 14px; font-size: 15.5px; line-height: 1.6; color: var(--ink-2); }
.fig figcaption b { color: var(--ink); font-weight: 600; }
.fig-center figcaption { max-width: 820px; margin-left: auto; margin-right: auto; text-align: center; }
.method-fig { max-width: 1000px; margin-left: auto; margin-right: auto; }

.stages { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 36px; }
.stage { border-radius: 14px; padding: 22px 22px 22px; background: var(--sc); }
.stage-1 { --sc: var(--s1); --sci: var(--s1-ink); }
.stage-2 { --sc: var(--s2); --sci: var(--s2-ink); }
.stage-3 { --sc: var(--s3); --sci: var(--s3-ink); }
.stage-num { font: 700 11.5px/1 var(--font-ui); letter-spacing: .1em; text-transform: uppercase; color: var(--sci); }
.stage h3 { margin: 10px 0 8px; font: 600 20px/1.25 var(--font-serif); color: var(--ink); }
.stage p { margin: 0; font-size: 15.5px; line-height: 1.6; color: var(--ink-2); }

.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: center; margin: 64px 0 0; }
.feature.flip .fig { order: 2; }
.feature .fig img { border-radius: 10px; }
.eyebrow { font: 700 11.5px/1 var(--font-ui); letter-spacing: .1em; text-transform: uppercase; }
.feature .h3 { margin-top: 10px; }
.feature p { margin: 0 0 12px; color: var(--ink-2); font-size: 17px; }
.eyebrow-1 { color: var(--s1-ink); } .eyebrow-2 { color: var(--s2-ink); } .eyebrow-3 { color: var(--s3-ink); }
.wide-fig { margin-top: 64px; }
.wide-fig .h3, .wide-fig .lead { text-align: center; }
.wide-fig .lead { max-width: 780px; margin-left: auto; margin-right: auto; }
.transfer-explanation { margin-top: 0; }
.transfer-method-fig { margin-bottom: 32px; padding: 0 23px; }

.result { margin-top: 72px; }
.result:first-of-type { margin-top: 0; }
.result-head { max-width: 800px; margin: 0 auto 24px; text-align: center; }
.result-head .lead { margin: 0; }
.card { border: 1px solid var(--rule); border-radius: 18px; padding: 22px; background: #fff; box-shadow: 0 1px 2px rgba(16, 24, 40, .04); }
.card + .card { margin-top: 18px; }
.card-title { margin: 0 0 14px; font: 600 15px var(--font-ui); color: var(--ink); }
.subhead { margin: 44px auto 18px; max-width: 800px; text-align: center; }
.subhead .h3 { font-size: 21px; }
.subhead .lead { margin: 0; font-size: 16.5px; }

/* ---------- BibTeX, footer ---------- */
#bibtex { padding-top: 56px; scroll-margin-top: 58px; }
.bib { position: relative; }
.bib pre {
  margin: 0; padding: 20px 22px; overflow-x: auto; border-radius: 14px;
  background: #f6f7f9; border: 1px solid var(--rule);
  font: 400 13.5px/1.65 var(--font-mono); color: var(--ink-2);
}
.copy {
  position: absolute; top: 12px; right: 12px; font: 600 12.5px var(--font-ui); color: var(--ink-2);
  background: #fff; border: 1px solid var(--rule); border-radius: 999px; padding: 6px 12px; cursor: pointer;
}
.copy:hover { border-color: var(--muted); }
.copy.is-done { color: #1f7a3d; border-color: #b9e0c5; }
footer { padding: 64px 0 56px; text-align: center; font-size: 14px; color: var(--muted); }
footer p { margin: 4px 0; }

@media (max-width: 860px) {
  .stages { grid-template-columns: 1fr; }
  .feature { grid-template-columns: 1fr; gap: 22px; }
  .feature.flip .fig { order: 0; }
}
@media (max-width: 640px) {
  .method-stage { padding-top: 36px; padding-bottom: 36px; }
  .method-stage-1 { margin-top: 32px; }
  .method-stage .result { margin-top: 40px; }
  .wrap.real-world-section { padding-top: 48px; }
  .transfer-method-fig { padding-left: 15px; padding-right: 15px; }
  body { font-size: 17px; }
  .wrap, .wrap-wide { padding: 0 16px; }
  .masthead { padding-top: 48px; }
  .authors { font-size: 17px; gap: 2px 14px; }
  .affils { font-size: 14.5px; }
  .teaser-labels { font-size: 10px; }
  .teaser-rows { display: none; }
  .h2 { font-size: 28px; }
  section { padding-top: 48px; }
  .card { padding: 14px; border-radius: 14px; }
  .abstract p { text-align: left; }
}