/* FORM project page. Palette and type follow the FORM video. */
:root {
  --bg: #f4f6f7;
  --surface: #ffffff;
  --surface-2: #f8fafb;
  --ink: #21333e;
  --ink-2: #2d4654;
  --muted: #566975;
  --faint: #8a99a4;
  --line: #d9e1e5;
  --line-soft: #e9eef1;
  --teal: #167b76;
  --teal-dark: #0f5e5a;
  --teal-soft: #e3f0ef;
  --blue: #2375aa;
  --orange: #c96932;
  --playdoh: #c93632;
  --slime: #9a7400;
  --plasticine: #4c5149;
  --bad: #b8433b;
  --code-bg: #1c2a33;
  --code-ink: #e6edf1;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(33 51 62 / 5%), 0 12px 32px -16px rgb(33 51 62 / 22%);
  --wrap: 1140px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 Lato, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--teal); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--teal-dark); }
b, strong { font-weight: 700; }
sup { font-size: .68em; line-height: 0; }
:focus-visible { outline: 3px solid rgb(22 123 118 / 45%); outline-offset: 2px; border-radius: 6px; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 16px; }
@media (min-width: 720px) { .wrap { padding-inline: 32px; } }
.narrow { max-width: 880px; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip { position: absolute; left: 16px; top: -60px; z-index: 50; padding: 8px 14px; border-radius: 8px; background: var(--ink); color: #fff; }
.skip:focus { top: 12px; color: #fff; }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 40;
  background: rgb(244 246 247 / 88%);
  -webkit-backdrop-filter: saturate(150%) blur(10px);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
.topbar.is-stuck { border-bottom-color: var(--line); }
.topbar-inner { display: flex; align-items: center; gap: 12px; height: 56px; }
.brand {
  font-size: 20px; font-weight: 900; letter-spacing: .03em; color: var(--teal); text-decoration: none;
  opacity: 0; transform: translateY(4px); transition: opacity .2s ease, transform .2s ease;
}
.topbar.is-stuck .brand { opacity: 1; transform: none; }
.topbar nav { display: flex; gap: 2px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.topbar nav::-webkit-scrollbar { display: none; }
.topbar nav a {
  flex: none; padding: 6px 11px; border-radius: 999px;
  color: var(--muted); font-size: 15px; font-weight: 700; text-decoration: none;
}
.topbar nav a:hover { color: var(--ink); background: #e7ecee; }
.topbar nav a.is-active { color: var(--teal); background: var(--teal-soft); }
@media (max-width: 600px) {
  .brand { display: none; }
  .topbar nav { margin-left: -8px; }
}

/* Hero */
.hero { padding: clamp(40px, 7vw, 84px) 0 clamp(28px, 4vw, 48px); text-align: center; }
.hero h1 { margin: 0; font-weight: 700; }
.wordmark {
  display: block; color: var(--teal);
  font-size: clamp(60px, 12vw, 116px); font-weight: 900; line-height: .92; letter-spacing: .02em;
}
.title {
  display: block; max-width: 36ch; margin: 18px auto 0;
  font-size: clamp(26px, 4.4vw, 46px); line-height: 1.14; letter-spacing: -.012em; text-wrap: balance;
}
.acronym { margin: 16px 0 0; color: var(--muted); font-size: clamp(16px, 2.2vw, 20px); }
.acronym b { color: var(--teal); font-weight: 900; }
.authors {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 22px;
  max-width: 920px; margin: 30px auto 0; padding: 0; list-style: none; font-size: 18px;
}
.authors a {
  color: var(--ink); text-decoration: none;
  background: linear-gradient(var(--line), var(--line)) 0 100% / 100% 1.5px no-repeat;
  transition: color .15s ease;
}
.authors a:hover { color: var(--teal); background-image: linear-gradient(var(--teal), var(--teal)); }
.authors sup { margin-left: 2px; color: var(--teal); font-weight: 700; }
.affiliations {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 2px 20px;
  max-width: 1000px; margin: 14px auto 0; padding: 0; list-style: none; color: var(--muted); font-size: 15px;
}
.affiliations sup, .contact sup { margin-right: 2px; color: var(--teal); font-weight: 700; }
.contact { margin: 8px 0 0; color: var(--muted); font-size: 15px; }
.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 30px; }
.links.start { justify-content: flex-start; margin-top: 22px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 18px;
  border: 1.5px solid var(--ink); border-radius: 999px; background: var(--ink); color: #fff;
  font-size: 16px; font-weight: 700; text-decoration: none; white-space: nowrap;
  transition: transform .15s ease, background-color .15s ease, border-color .15s ease, color .15s ease;
}
.btn svg { flex: none; width: 18px; height: 18px; }
.btn:hover { transform: translateY(-1px); border-color: var(--ink-2); background: var(--ink-2); color: #fff; }
.btn-light { border-color: var(--line); background: var(--surface); color: var(--ink); }
.btn-light:hover { border-color: var(--teal); background: var(--surface); color: var(--teal); }
.btn-soon, .btn-soon:hover {
  transform: none; border: 1.5px dashed #b8c5cc; background: transparent; color: var(--faint); cursor: default;
}
.soon {
  padding: 2px 8px; border-radius: 999px; background: #e7ecee; color: var(--muted);
  font-size: 11px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase;
}

/* Teaser */
.teaser { padding-bottom: clamp(48px, 7vw, 88px); }
.teaser-card {
  display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(28px, 4vw, 48px); align-items: center; padding: clamp(20px, 4vw, 44px);
  background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow);
}
@media (min-width: 980px) { .teaser-card { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); } }
.teaser h2 {
  margin: 0; color: var(--teal);
  font-size: clamp(28px, 3.2vw, 36px); font-weight: 900; line-height: 1.12; letter-spacing: -.012em;
}
.lede { margin: 18px 0 0; font-size: clamp(19px, 2.2vw, 23px); line-height: 1.4; }
.steps { display: grid; gap: 18px; margin: 28px 0 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 42px 1fr; }
.steps .num { color: var(--teal); font-size: 15px; font-weight: 900; line-height: 1.8; }
.steps b { display: block; font-size: 18.5px; line-height: 1.35; }
.steps .sub { display: block; margin-top: 2px; color: var(--muted); font-size: 16px; line-height: 1.5; }

.grid9 {
  display: grid; grid-template-columns: auto repeat(3, minmax(0, 1fr)); gap: 8px 10px; align-items: center; margin: 0;
}
.grid9 .col { padding-top: 6px; color: var(--teal); font-size: 15px; font-weight: 700; line-height: 1.25; text-align: center; }
.grid9 .row { padding-right: 4px; font-size: 14.5px; line-height: 1.3; text-align: right; white-space: nowrap; }
.grid9 .row b { display: block; font-size: 15.5px; }
.grid9 img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 8px; background: var(--line); }
.grid9 img.tall { aspect-ratio: 531 / 618; }
.grid9 figcaption { grid-column: 1 / -1; margin-top: 8px; color: var(--muted); font-size: 14.5px; line-height: 1.5; }
@media (max-width: 560px) {
  .grid9 { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
  .grid9 .corner { display: none; }
  .grid9 .row { grid-column: 1 / -1; padding: 8px 0 0; text-align: left; white-space: normal; }
  .grid9 .row b { display: inline; }
}

/* Sections */
.section { padding: clamp(56px, 8vw, 96px) 0; border-top: 1px solid var(--line); }
.eyebrow { margin: 0 0 10px; color: var(--teal); font-size: 13px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.section-title {
  max-width: 26ch; margin: 0;
  font-size: clamp(28px, 3.8vw, 42px); font-weight: 900; line-height: 1.14; letter-spacing: -.012em; text-wrap: balance;
}
.section-lede { max-width: 72ch; margin: 16px 0 0; color: var(--muted); font-size: clamp(17px, 1.9vw, 19px); }
.section-lede b { color: var(--ink); }
figcaption { color: var(--muted); font-size: 15px; line-height: 1.55; }

/* Video */
.player {
  position: relative; margin-top: 28px; aspect-ratio: 16 / 9; overflow: hidden;
  background: #0f1b22; border-radius: 16px; box-shadow: var(--shadow);
}
.player video { width: 100%; height: 100%; object-fit: contain; }
.play {
  position: absolute; inset: 0; display: grid; place-items: center; margin: auto;
  width: clamp(64px, 9vw, 92px); height: clamp(64px, 9vw, 92px);
  border: 0; border-radius: 50%; background: rgb(22 123 118 / 94%); color: #fff; cursor: pointer;
  box-shadow: 0 12px 32px rgb(0 0 0 / 28%); transition: transform .15s ease, background-color .15s ease;
}
.play:hover { transform: scale(1.06); background: var(--teal); }
.play svg { width: 40%; height: 40%; margin-left: 6%; }
.player.is-started .play { display: none; }
.chapters { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.chapters button {
  display: inline-flex; align-items: baseline; gap: 8px; padding: 7px 13px;
  border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--ink); cursor: pointer;
  font-family: inherit; font-size: 14.5px; font-weight: 700; line-height: 1.2;
  transition: border-color .15s ease, background-color .15s ease, color .15s ease;
}
.chapters button:hover { border-color: var(--teal); }
.chapters time { color: var(--teal); font-weight: 900; font-variant-numeric: tabular-nums; }
.chapters button[aria-current="true"] { border-color: var(--teal); background: var(--teal); color: #fff; }
.chapters button[aria-current="true"] time { color: #d4efec; }
.transcript { margin-top: 18px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.transcript summary { padding: 14px 18px; font-weight: 700; cursor: pointer; }
.transcript-body { padding: 0 18px 10px; columns: 2 340px; column-gap: 36px; }
.transcript-body h3 {
  margin: 12px 0 4px; color: var(--teal); font-size: 13px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase;
  break-after: avoid;
}
.transcript-body p { margin: 0 0 8px; color: var(--muted); font-size: 15.5px; break-inside: avoid; }

/* Abstract */
.abstract { max-width: 78ch; margin: 18px 0 0; font-size: clamp(17px, 1.9vw, 18.5px); line-height: 1.75; }

/* Method */
.figure { margin: 32px 0 0; }
.figure img { width: 100%; background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); }
.figure figcaption { max-width: 100ch; margin-top: 12px; }
.figure figcaption b { color: var(--teal); }
.ideas { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; margin-top: 32px; }
@media (min-width: 900px) { .ideas { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.idea, .plan-row {
  padding: 22px 24px 24px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
}
.idea { display: flex; flex-direction: column; min-width: 0; }
.idea h3, .plan-row h3 { display: flex; align-items: baseline; gap: 10px; margin: 0; font-size: 19px; line-height: 1.3; }
.idea h3 span { color: var(--teal); font-size: 14px; font-weight: 900; }
.idea p, .plan-row p { margin: 8px 0 18px; color: var(--muted); font-size: 16px; line-height: 1.6; }
.eq-wrap {
  margin-top: auto; padding: 16px 12px; overflow-x: auto; font-size: 16px;
  background: var(--surface-2); border: 1px solid var(--line-soft); border-radius: 10px;
}
.eq { max-width: 100%; margin-inline: auto; }
.plan-row { display: grid; grid-template-columns: minmax(0, 1fr); gap: 4px 32px; align-items: center; margin-top: 16px; }
.plan-row p { margin-bottom: 0; }
@media (min-width: 900px) { .plan-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 560px) {
  .idea, .plan-row { padding: 18px 16px 18px; }
  .eq-wrap { padding: 12px 8px; font-size: 12.5px; }
  .eq { max-width: none; }
  .plan-row .eq-wrap { margin-top: 14px; }
}

/* Results */
.stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 32px; }
@media (min-width: 900px) { .stats { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.stat { padding: 18px 20px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.stat strong {
  display: block; color: var(--teal); white-space: nowrap;
  font-size: clamp(26px, 3.4vw, 38px); font-weight: 900; line-height: 1.1; letter-spacing: -.01em;
}
.stat span { display: block; margin-top: 8px; color: var(--muted); font-size: 14.5px; line-height: 1.45; }

.task { margin-top: clamp(48px, 6vw, 72px); }
.task-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.task-head h3 { margin: 0; font-size: clamp(22px, 2.6vw, 28px); font-weight: 900; line-height: 1.2; letter-spacing: -.01em; }
.pill {
  padding: 4px 11px; border-radius: 999px; background: var(--teal-soft); color: var(--teal);
  font-size: 12px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase;
}
.pill-hw { background: #f8ece4; color: #a4521f; }
.desc { max-width: 80ch; margin: 12px 0 0; }
.media-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; margin-top: 22px; }
.media-grid + .media, .media + .media-grid, .media + .media { margin-top: 16px; }
.task > .media { margin-top: 22px; }
@media (min-width: 900px) {
  .media-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .media-grid.split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); align-items: start; }
  .media-grid.hw { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); align-items: start; }
}
.media { margin: 0; padding: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.media > video, .media > img { width: 100%; background: var(--bg); border-radius: 8px; }
.media figcaption { padding: 12px 6px 4px; }
.media figcaption > b:first-child { color: var(--ink); }
video.clip { cursor: pointer; }
.outcomes { display: grid; gap: 6px; margin: 10px 0 0; padding: 0; list-style: none; }
.outcomes li { padding-left: 27px; color: var(--ink); font-size: 15px; background: no-repeat 0 2px / 18px 18px; }
.outcomes .ok { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Ccircle cx='9' cy='9' r='9' fill='%23167b76'/%3E%3Cpath d='M5 9.4l2.6 2.6L13 6.6' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); }
.outcomes .bad { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Ccircle cx='9' cy='9' r='9' fill='%23b8433b'/%3E%3Cpath d='M6.2 6.2l5.6 5.6M11.8 6.2l-5.6 5.6' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E"); }
.outcomes .meh { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Ccircle cx='9' cy='9' r='9' fill='%238a99a4'/%3E%3Cpath d='M5.5 9h7' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E"); }

.summary { padding: 20px 22px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.summary h4 { margin: 0 0 8px; color: var(--muted); font-size: 13px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.summary h4 ~ h4 { margin-top: 22px; }
.mini { width: 100%; border-collapse: collapse; font-size: 15px; font-variant-numeric: tabular-nums; }
.mini th, .mini td { padding: 7px 8px; text-align: right; border-bottom: 1px solid var(--line-soft); }
.mini th:first-child { padding-left: 0; text-align: left; }
.mini thead th { color: var(--muted); font-size: 13px; font-weight: 700; }
.mini tbody th { font-weight: 700; }
.mini .true { color: var(--faint); font-size: 13px; font-weight: 400; }
.mini .good { color: var(--teal); font-weight: 900; }
.mat-a { color: var(--blue); }
.mat-b { color: var(--orange); }
.summary p { margin: 14px 0 0; color: var(--muted); font-size: 14.5px; line-height: 1.5; }

.scan-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.scan { margin: 0; text-align: center; }
.scan img { width: 100%; background: #f2f2f0; border-radius: 8px; }
.scan span { display: block; margin-top: 8px; font-size: 15px; font-weight: 700; line-height: 1.3; }
.scan strong { display: block; font-size: clamp(22px, 2.6vw, 30px); font-weight: 900; line-height: 1.15; }
.mat-playdoh { color: var(--playdoh); }
.mat-slime { color: var(--slime); }
.mat-plasticine { color: var(--plasticine); }

/* Benchmark */
.table-wrap { margin-top: 28px; overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.bench { width: 100%; min-width: 780px; border-collapse: collapse; font-size: 15px; font-variant-numeric: tabular-nums; }
.bench th, .bench td { padding: 11px 14px; text-align: right; white-space: nowrap; }
.bench thead th { border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12.5px; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; }
.bench thead tr:first-child th { padding-bottom: 2px; border-bottom: 0; color: var(--ink); font-size: 14px; letter-spacing: .08em; text-align: center; }
.bench thead tr:first-child th:first-child { text-align: left; }
.bench .grp { border-left: 1px solid var(--line-soft); }
.bench tbody th { text-align: left; font-weight: 700; }
.bench tbody th small { display: block; color: var(--muted); font-size: 13px; font-weight: 400; }
.bench tbody tr + tr { border-top: 1px solid var(--line-soft); }
.bench tbody tr.ours { background: #f3f9f8; }
.bench tbody tr.ours th { color: var(--teal); }
.bench td.t { color: var(--muted); }
.bench td.best { color: var(--teal); font-weight: 900; }
.table-notes { display: grid; gap: 6px; max-width: 100ch; margin: 16px 0 0; padding-left: 20px; color: var(--muted); font-size: 15px; }
.table-notes b { color: var(--ink); }

/* Code and citation */
.code-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; align-items: start; margin-top: 28px; }
@media (min-width: 900px) { .code-grid { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); } }
.code-grid p { margin: 0 0 14px; }
.note { color: var(--muted); font-size: 14.5px; }
.links + .note { margin-top: 18px; }
.codeblock { overflow: hidden; background: var(--code-bg); border-radius: var(--radius); box-shadow: var(--shadow); }
.bibtex .codeblock { margin-top: 24px; }
.codeblock-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px 10px 18px;
  border-bottom: 1px solid rgb(255 255 255 / 8%); color: #9fb2bd; font-size: 13px; font-weight: 700; letter-spacing: .04em;
}
.copy {
  padding: 5px 12px; border: 1px solid rgb(255 255 255 / 20%); border-radius: 999px; background: transparent;
  color: var(--code-ink); font-family: inherit; font-size: 13px; font-weight: 700; cursor: pointer;
}
.copy:hover { border-color: rgb(255 255 255 / 45%); }
.codeblock pre { margin: 0; padding: 16px 18px 18px; overflow-x: auto; }
.codeblock code { color: var(--code-ink); font: 13.5px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; white-space: pre; }

@media (max-width: 720px) { #bibtex-code { white-space: pre-wrap; overflow-wrap: anywhere; } }

/* Footer */
.footer { padding: 36px 0 56px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14.5px; }
.footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }
.footer p { margin: 0; }
.footer b { color: var(--teal); }