/* Light, sans-serif project page adapted from the HC-DLM template (hc-dlm.github.io).
   Accent (light blue) marks headings, highlights and best results; green marks backward verification. */
:root {
  --accent: #3a8fdc;        /* light blue: fills, borders, bars */
  --accent-ink: #1f73bf;    /* the same hue, dark enough for small text */
  --accent-soft: #eaf4fd;
  --accent-line: #c6e0f7;
  --green: #1f8a5b;
  --green-soft: #e8f6ef;
  --ink: #1a1c20;
  --ink-soft: #4a4f57;
  --muted: #8b8f97;
  --bg: #ffffff;
  --bg-alt: #f6f9fc;
  --card: #ffffff;
  --line: #e5e8ec;
  --shadow-1: 0 1px 2px rgba(20, 22, 26, 0.04), 0 8px 24px rgba(20, 22, 26, 0.06);
  --radius: 18px;
  --sans: "Inter", "Noto Sans", system-ui, -apple-system, sans-serif;
  --mono: "Fira Code", ui-monospace, SFMono-Regular, Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 110%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
.section, .hero { scroll-margin-top: 3.636rem; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.012em; margin: 0; line-height: 1.2; }
p { margin: 0 0 1rem; }
img { display: block; max-width: 100%; height: auto; }
a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
code { font-family: var(--mono); font-size: 0.88em; background: var(--bg-alt); border: 1px solid var(--line); border-radius: 5px; padding: 0 0.3em; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.ac { color: var(--accent); }
.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 1rem; top: 1rem; z-index: 50; background: #fff; padding: 0.4rem 0.8rem; border-radius: 8px; box-shadow: var(--shadow-1); }

.container { max-width: 1180px; margin: 0 auto; padding: 0 1.5rem; }
.container.narrow { max-width: 980px; }
.container.wide { max-width: 1480px; }

/* Top navigation */
.topnav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 0.9091rem;
  padding: 0.5909rem 1.591rem; background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line); font-size: 0.8364rem;
}
.brand { font-weight: 800; letter-spacing: -0.01em; text-decoration: none; font-size: 0.9545rem; }
.topnav ul { list-style: none; display: flex; align-items: center; gap: 1.455rem; margin: 0; padding: 0; }
.topnav ul a { color: var(--ink-soft); text-decoration: none; font-weight: 500; }
.topnav ul a:hover { color: var(--ink); }

/* Hero */
.hero {
  position: relative; padding: 3.864rem 1.364rem 3.182rem; text-align: center;
  background:
    radial-gradient(900px 380px at 82% -10%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 60%),
    radial-gradient(900px 380px at 0% 0%, color-mix(in srgb, var(--accent) 7%, transparent), transparent 60%),
    #fff;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(rgba(0, 0, 0, 0.035) 1px, transparent 1px);
  background-size: 22px 22px;
}
.hero-inner { position: relative; z-index: 1; max-width: 1140px; margin: 0 auto; }
.eyebrow { display: inline-block; margin: 0 0 1rem; padding: 0.25rem 0.8rem; border-radius: 999px; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-ink); background: var(--accent-soft); border: 1px solid var(--accent-line); }
.publication-title {
  font-size: clamp(30.4px, 3.6vw, 44px); line-height: 1.16; letter-spacing: -0.022em; font-weight: 800;
  margin: 0 auto 0.8182rem; max-width: none; text-wrap: balance;
}
.subtitle { max-width: 66ch; margin: 0 auto 1.727rem; font-size: clamp(18px, 1.9vw, 23px); font-weight: 500; color: var(--ink-soft); line-height: 1.4; text-wrap: balance; }
.subtitle .hl { color: var(--accent-ink); font-weight: 700; white-space: nowrap; background: linear-gradient(transparent 60%, color-mix(in srgb, var(--accent) 22%, #fff) 60%); padding: 0 0.1em; }
.authors { margin: 0 0 0.5rem; font-size: 0.9273rem; line-height: 1.8; }
.authors > span { white-space: nowrap; }
.authors sup, .affils sup { color: var(--accent-ink); font-weight: 600; font-size: 0.72em; margin-left: 0.06em; }
.affils { margin: 0 0 1.727rem; font-size: 0.8636rem; color: var(--ink-soft); line-height: 1.7; }
.affils span { display: inline-block; margin: 0 0.6818rem; }

.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6364rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.4545rem;
  padding: 0.5636rem 1.136rem; border-radius: 999px; font-size: 0.8364rem; font-weight: 600;
  color: #fff; background: var(--ink); border: 1px solid var(--ink); text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease, background-color 120ms ease;
}
.btn:hover { background: #000; transform: translateY(-1px); box-shadow: var(--shadow-1); }
.btn.ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { background: var(--accent-soft); border-color: var(--accent-line); }
.btn.soon { background: #fff; color: var(--muted); border: 1px dashed #c8ccd2; cursor: default; }
.btn.soon:hover { transform: none; box-shadow: none; }

/* Metrics under the hero */
.metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; margin: 0 0 2rem; }
.metric { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 1rem 0.6rem 0.9rem; box-shadow: var(--shadow-1); text-align: center; }
.metric b { display: block; font-size: 2.1rem; font-weight: 800; letter-spacing: -0.03em; line-height: 1; color: var(--accent); font-variant-numeric: tabular-nums; }
.metric span { display: block; margin-top: 0.4rem; font-size: 0.8rem; line-height: 1.3; color: var(--ink-soft); }

/* Demo: task tabs above the card (iframe) */
.demo-wrap { position: relative; z-index: 1; max-width: calc(1180px - 2.727rem); margin: 2.5rem auto 0; }
.demo-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.5rem; max-width: 760px; margin: 0 auto 0.9rem; padding: 0.35rem; background: #fff; border: 1px solid var(--line); border-radius: 999px; box-shadow: var(--shadow-1); }
.demo-tabs button { font: inherit; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; padding: 0.6rem 0.5rem; border: 0; border-radius: 999px; background: transparent; color: var(--ink-soft); cursor: pointer; transition: background-color 150ms ease, color 150ms ease; }
.demo-tabs button:hover { background: var(--accent-soft); color: var(--accent-ink); }
.demo-tabs button[aria-selected="true"] { background: var(--accent); color: #fff; box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 30%, transparent); }
.demo-tabs button.backward:hover { background: var(--green-soft); color: var(--green); }
.demo-tabs button.backward[aria-selected="true"] { background: var(--green); color: #fff; box-shadow: 0 4px 12px color-mix(in srgb, var(--green) 30%, transparent); }
.demo { text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-1); overflow: hidden; }
.demo iframe { display: block; width: 100%; height: 790px; border: 0; background: transparent; }
@media (max-width: 768px) {
  .demo iframe { height: 720px; }
  .demo-tabs { border-radius: 16px; }
  .demo-tabs button { font-size: 0.68rem; letter-spacing: 0.02em; padding: 0.55rem 0.3rem; border-radius: 12px; }
}

/* Sections */
.section { padding: 4.5rem 0 4rem; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.kicker { display: block; width: fit-content; margin: 0 auto 0.8rem; padding: 0.3em 0.7em 0.3em 0.75em; font-size: 1.55rem; font-weight: 700; line-height: 1.2; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent-ink); background: var(--accent-soft); border-left: 5px solid var(--accent); border-radius: 3px 10px 10px 3px; }
h2 { text-align: center; font-size: clamp(25.6px, 2.8vw, 34.4px); letter-spacing: -0.02em; margin-bottom: 1rem; }
h3 { font-size: 1.15rem; letter-spacing: -0.01em; }
.lead { text-align: center; color: var(--ink-soft); max-width: 72ch; margin: 0 auto 1rem; font-size: 1.02rem; }
.prose { max-width: 66rem; margin: 1.75rem auto 0; font-size: 1.02rem; line-height: 1.75; color: var(--ink-soft); }
.prose p { margin-bottom: 1.1rem; text-align: justify; hyphens: auto; }
.prose strong { color: var(--ink); }
.container.narrow + .container { margin-top: 2rem; }
.container > * + * { margin-top: 1.75rem; }

/* Figures */
.figure { margin: 0; }
.figure figcaption { margin: 0.9rem auto 0; max-width: 78ch; text-align: center; font-size: 0.92rem; line-height: 1.55; color: var(--ink-soft); }
.figure figcaption strong { color: var(--ink); }
.framed img { width: 100%; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem 1.5rem; box-shadow: var(--shadow-1); }
.figure a { display: block; }

/* Task cards: flip to show input, output and metric */
.task-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; }
.flip { perspective: 1200px; outline: none; cursor: pointer; }
.flip-inner { display: grid; height: 100%; transform-style: preserve-3d; transition: transform 600ms cubic-bezier(.2, .7, .2, 1); }
.flip .face { grid-area: 1 / 1; backface-visibility: hidden; -webkit-backface-visibility: hidden; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem 1.6rem 1.35rem; box-shadow: var(--shadow-1); display: flex; flex-direction: column; }
.flip .back { transform: rotateY(180deg); background: linear-gradient(180deg, var(--accent-soft), #fff 70%); border-color: var(--accent-line); }
.flip.backward .back { background: linear-gradient(180deg, var(--green-soft), #fff 70%); border-color: color-mix(in srgb, var(--green) 25%, #fff); }
@media (hover: hover) { .flip:hover .flip-inner { transform: rotateY(180deg); } }
.flip.is-flipped .flip-inner, .flip:focus-visible .flip-inner { transform: rotateY(180deg); }
.flip:focus-visible .face { box-shadow: 0 0 0 3px var(--accent-line), var(--shadow-1); }
@media (prefers-reduced-motion: reduce) { .flip-inner { transition: none; } }
.task h3 { margin: 1rem 0 0.6rem; display: flex; align-items: baseline; gap: 0.6rem; }
.task h3 .num { font-size: 0.85rem; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }
.task .front > p { font-size: 0.93rem; color: var(--ink-soft); line-height: 1.55; }
.flip-hint { margin-top: auto; padding-top: 0.6rem; font-size: 0.72rem; font-weight: 600; letter-spacing: 0.04em; color: var(--accent-ink); }
.task.backward .flip-hint { color: var(--green); }
.task dl { margin: 0.4rem 0 0; display: grid; grid-template-columns: auto 1fr; gap: 0.7rem 1rem; font-size: 0.95rem; }
.task dt { font-weight: 700; color: var(--ink); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; padding-top: 0.2rem; }
.task dd { margin: 0; color: var(--ink-soft); line-height: 1.45; }
.tag { display: inline-block; width: fit-content; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-ink); background: var(--accent-soft); border-radius: 999px; padding: 0.3rem 0.75rem; }
.tag.backward { color: var(--green); background: var(--green-soft); }
.task.backward h3 .num { color: var(--green); }
.zoom-hint { display: none; }

/* Benchmark facts */
.split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 2.25rem; align-items: center; }
.split .lead { text-align: left; margin-left: 0; }
.facts { display: grid; gap: 0.9rem; margin-top: 1.25rem; }
.fact { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 4px 14px 14px 4px; padding: 0.9rem 1.15rem; }
.fact strong { display: block; margin-bottom: 0.25rem; font-size: 0.98rem; }
.fact p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); line-height: 1.55; }
.split .figure img { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow-1); }

/* Findings (headline numbers) */
.finding-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; }
.finding { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem 1.6rem 1.35rem; box-shadow: var(--shadow-1); display: flex; flex-direction: column; }
.stat { display: flex; flex-direction: column; margin: 1rem 0 0.9rem; }
.stat-num { font-size: 2.6rem; font-weight: 800; letter-spacing: -0.03em; line-height: 1; color: var(--accent); font-variant-numeric: tabular-nums; }
.stat-num small { font-size: 0.5em; font-weight: 700; margin-left: 0.05em; }
.stat-sub { font-size: 0.85rem; color: var(--ink-soft); margin-top: 0.35rem; }

/* Bars */
.bars { background: var(--bg-alt); border: 1px solid var(--line); border-radius: 12px; padding: 0.9rem 1rem 0.8rem; margin-top: auto; }
.bars-title { margin: 0 0 0.6rem; font-size: 0.8rem; font-weight: 600; color: var(--ink-soft); }
.bar-row { display: grid; grid-template-columns: minmax(6rem, 8.5rem) 1fr 2.6rem; align-items: center; gap: 0.6rem; font-size: 0.8rem; padding: 0.22rem 0; color: var(--ink-soft); }
.bar-label { line-height: 1.25; }
.bar { display: block; height: 0.85rem; background: #e6e9ee; border-radius: 4px; overflow: hidden; }
.bar i { display: block; height: 100%; width: calc(var(--v) * 1%); background: #b9c2cd; border-radius: 4px; }
.bar-val { text-align: right; font-variant-numeric: tabular-nums; }
.bar-row.top { color: var(--accent-ink); font-weight: 700; }
.bar-row.top .bar i { background: var(--accent); }
.bar-row.top .bar { background: var(--accent-soft); }

/* Result blocks and tables */
.result-block { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-1); padding: 1.5rem 1.6rem 1.25rem; }
.result-block > h3 { display: flex; align-items: baseline; gap: 0.6rem; margin-bottom: 0.5rem; }
.result-block > h3 .num { font-size: 0.85rem; font-weight: 800; color: var(--accent); }
.result-block > p { color: var(--ink-soft); font-size: 0.95rem; }
.table-scroll { overflow-x: auto; }
table.results { width: 100%; border-collapse: collapse; font-size: 0.88rem; line-height: 1.3; font-variant-numeric: tabular-nums; }
table.results caption { text-align: left; font-size: 0.82rem; font-weight: 600; color: var(--muted); padding-bottom: 0.5rem; }
table.results th, table.results td { padding: 0.48rem 0.6rem; text-align: right; vertical-align: bottom; white-space: nowrap; }
table.results thead th { font-weight: 600; color: var(--ink-soft); border-bottom: 1.5px solid var(--ink); padding-bottom: 0.55rem; white-space: normal; }
table.results thead th:first-child, table.results tbody th { text-align: left; }
table.results tbody th { font-weight: 400; }
table.results tbody tr { border-bottom: 1px solid var(--line); }
table.results tbody tr:last-child { border-bottom: 1.5px solid var(--ink); }
table.results tr.group th { padding-top: 0.7rem; padding-bottom: 0.25rem; font-style: italic; font-size: 0.85rem; color: var(--muted); border-bottom: 0; }
table.results tr.group { border-bottom: 0; }
table.results .best { font-weight: 700; color: var(--accent-ink); background: var(--accent-soft); }
table.results .na { color: var(--muted); }
.table-note { color: var(--muted); font-size: 0.86rem; margin: 0.9rem 0 0; line-height: 1.55; }
.result-stack > * + * { margin-top: 1.25rem; }

/* FL rules */
.rules { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; margin: 0.25rem 0 1.25rem; }
.rule { border-radius: 12px; padding: 0.85rem 1.05rem; background: var(--bg-alt); border: 1px solid var(--line); }
.rule.refute { background: var(--accent-soft); border-color: var(--accent-line); }
.rule strong { display: block; font-size: 0.92rem; margin-bottom: 0.2rem; }
.rule.refute strong { color: var(--accent-ink); }
.rule p { margin: 0; font-size: 0.86rem; color: var(--ink-soft); line-height: 1.5; }

/* Analysis panels and callout */
.panels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; align-items: stretch; }
.panel h3 { margin-bottom: 0.6rem; }
.panel > p { font-size: 0.95rem; color: var(--ink-soft); line-height: 1.6; }
.panel img { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 0.75rem; box-shadow: var(--shadow-1); }
.callout { background: var(--accent-soft); border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; padding: 1.1rem 1.35rem; max-width: 980px; margin-left: auto; margin-right: auto; }
.callout .callout-kicker { margin: 0 0 0.25rem; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-ink); }
.callout h3 { margin-bottom: 0.45rem; }
.callout p { margin: 0; color: var(--ink-soft); font-size: 0.98rem; }

/* Footer */
.footer { padding: 2.5rem 0 3rem; font-size: 0.9rem; color: var(--muted); }
.footer p { margin: 0 auto 0.3rem; text-align: center; max-width: 80ch; }
.footer a { color: var(--ink-soft); }

@media (max-width: 1000px) {
  .finding-grid, .task-grid { grid-template-columns: 1fr 1fr; }
  .finding:last-child, .task:last-child { grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  .topnav ul li:not(:last-child) { display: none; }
  body { font-size: 17px; }
  .hero { padding: 2.727rem 0.9091rem 2.273rem; }
  .finding-grid, .task-grid, .panels, .split, .rules { grid-template-columns: 1fr; }
  .finding:last-child, .task:last-child { grid-column: auto; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .framed img { padding: 0.75rem; }
  .prose p { text-align: left; }
  .kicker { font-size: 1.2rem; }
  .container { padding: 0 1rem; }
}

/* Zoomable figure: the image scales and pans inside its card */
.zoom { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem 1.5rem; box-shadow: var(--shadow-1); outline: none; }
.zoom:focus-visible { box-shadow: 0 0 0 3px var(--accent-line), var(--shadow-1); }
.zoom-viewport { position: relative; overflow: hidden; border-radius: 8px; touch-action: pan-y; cursor: zoom-in; user-select: none; -webkit-user-select: none; }
.zoom-viewport img { width: 100%; transform-origin: 0 0; will-change: transform; }
.zoom.is-zoomed .zoom-viewport { touch-action: none; cursor: grab; box-shadow: inset 0 0 0 1px var(--accent-line); }
.zoom.is-dragging .zoom-viewport { cursor: grabbing; }
.zoom.is-animating .zoom-viewport img { transition: transform 200ms ease; }
.zoom-controls { position: absolute; top: 0.6rem; right: 0.7rem; z-index: 2; display: flex; align-items: center; gap: 0.25rem; padding: 0.2rem; background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(6px); border: 1px solid var(--line); border-radius: 999px; box-shadow: var(--shadow-1); font-size: 0.75rem; }
.zoom-controls button, .zoom-controls a { font: inherit; font-weight: 700; min-width: 1.9rem; height: 1.9rem; padding: 0 0.55rem; display: inline-grid; place-items: center; border: 0; border-radius: 999px; background: transparent; color: var(--ink); cursor: pointer; text-decoration: none; }
.zoom-controls button:hover, .zoom-controls a:hover { background: var(--accent-soft); color: var(--accent-ink); }
.zoom-controls button[data-act="in"], .zoom-controls button[data-act="out"] { font-size: 1.05rem; }
.zoom-controls button:disabled { color: var(--muted); background: transparent; cursor: default; }
.zoom-level { min-width: 3.2em; text-align: center; color: var(--accent-ink); font-variant-numeric: tabular-nums; }
.zoom-hint { margin: 0.6rem 0 0; text-align: center; font-size: 0.75rem; color: var(--muted); }
@media (max-width: 860px) {
  .zoom { padding: 0.75rem; }
  .zoom-controls { top: 0.35rem; right: 0.35rem; }
  .zoom-hint { font-size: 0.7rem; }
}
.task-grid + .figure { margin-top: 1.75rem; }

/* Analysis: one card per task */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-1); padding: 1.35rem 1.4rem 1.2rem; display: flex; flex-direction: column; }
.panel h3 { margin: 0.8rem 0 0.5rem; font-size: 1.05rem; }
.panel > p { font-size: 0.9rem; line-height: 1.55; }
.panel .figure { margin-top: auto; }
.panel img { box-shadow: none; padding: 0.4rem; }
.panel .bars { margin-top: 0; }
.panel .bar-row { grid-template-columns: minmax(0, 9.6rem) 1fr 2.4rem; gap: 0.5rem; font-size: 0.72rem; }
.panel figcaption { font-size: 0.8rem; margin-top: 0.6rem; }
@media (max-width: 1000px) { .panels { grid-template-columns: 1fr; max-width: 640px; margin-left: auto; margin-right: auto; } }
.container.wide .callout { max-width: none; }