:root {
  --ink: #1a222c;
  --ink-soft: #3d4a59;
  --steel: #4a6fa5;
  --steel-deep: #2f4a6e;
  --mist: #f0f0f0;
  --fog: #ffffff;
  --line: rgba(26, 34, 44, 0.12);
  --paper: #ffffff;
  --shadow: rgba(26, 34, 44, 0.08);
  --max: 1120px;
  --font-display: "Syne", sans-serif;
  --font-body: "Source Serif 4", Georgia, "Times New Roman", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: #ffffff;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  background: #ffffff !important;
  -webkit-font-smoothing: antialiased;
}

img,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  color: var(--steel-deep);
  margin-bottom: 0.85rem;
}

h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
  color: var(--ink);
}

p {
  margin: 0;
}

.hero {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-bottom: 1.5rem;
}

.hero-copy {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 3rem 0 1.25rem;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 0.85rem;
}

.brand {
  font-size: clamp(2.4rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--ink);
  line-height: 1.05;
  margin-bottom: 0.85rem;
}

.venue {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--steel);
  margin-bottom: 0.85rem;
}

.venue a {
  color: inherit;
  text-decoration: none;
}

.venue a:hover {
  text-decoration: underline;
}

.tagline {
  max-width: 40rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--ink-soft);
  margin-bottom: 1.15rem;
}

.authors {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.4rem;
}

.authors sup,
.affiliations sup,
.corresponding sup {
  font-size: 0.68em;
  line-height: 0;
}

.affiliations,
.corresponding {
  max-width: 46rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.affiliations {
  margin-bottom: 0.25rem;
}

.affil-sep {
  margin: 0 0.4rem;
}

.corresponding {
  margin-bottom: 1.45rem;
}

.corresponding a {
  color: var(--steel-deep);
  text-decoration: none;
}

.corresponding a:hover {
  text-decoration: underline;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  padding: 0.8rem 1.25rem;
  border-radius: 0.35rem;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  cursor: not-allowed;
  opacity: 0.72;
  text-decoration: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

a.btn:not([aria-disabled="true"]) {
  cursor: pointer;
  opacity: 1;
}

a.btn:not([aria-disabled="true"]):hover {
  transform: translateY(-1px);
}

.btn-note {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  opacity: 0.85;
}

.btn-primary {
  background: var(--steel-deep);
  color: #f7fafc;
}

.btn-secondary {
  background: transparent;
  color: var(--steel-deep);
  border-color: rgba(47, 74, 110, 0.35);
}

.hero-visual {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0.25rem auto 1.75rem;
  background: #ffffff;
}

.hero-visual img {
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  margin: 0 auto;
  display: block;
}

.section {
  padding: 4.5rem 0;
  background: #ffffff;
}

.section-inner {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
}

.section-lead {
  max-width: 42rem;
  color: var(--ink-soft);
  margin-bottom: 1.75rem;
}

.abstract-section {
  background: #ffffff;
  border-top: 1px solid var(--line);
}

.abstract-section p {
  max-width: 46rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.method-section {
  border-top: 1px solid var(--line);
}

.arch-figure {
  margin: 0;
}

.arch-figure img {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: 0 18px 40px var(--shadow);
}

.arch-figure figcaption {
  margin-top: 1rem;
  max-width: 48rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.video-section {
  border-top: 1px solid var(--line);
}

.featured-video {
  margin: 1.5rem 0 0;
}

.video-wrap-featured {
  max-width: 56rem;
  margin: 0 auto;
}

.demos-section {
  border-top: 1px solid var(--line);
  padding-bottom: 5rem;
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 800px) {
  .demo-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem 1.5rem;
  }
}

.demo-item {
  margin: 0;
}

.video-wrap {
  position: relative;
  background: #111820;
  border: 1px solid var(--line);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #111820;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem 1.25rem 2.5rem;
  text-align: center;
}

.site-footer p {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.site-footer p + p {
  margin-top: 0.35rem;
  font-weight: 500;
}

.reveal,
.reveal-delay,
.demo-item,
.arch-figure,
.featured-video,
.abstract-section p {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-delay {
  transition-delay: 0.12s;
}

.demo-item:nth-child(2) { transition-delay: 0.06s; }
.demo-item:nth-child(3) { transition-delay: 0.12s; }
.demo-item:nth-child(4) { transition-delay: 0.18s; }

.reveal.is-visible,
.reveal-delay.is-visible,
.demo-item.is-visible,
.arch-figure.is-visible,
.featured-video.is-visible,
.abstract-section p.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .reveal-delay,
  .demo-item,
  .arch-figure,
  .featured-video,
  .abstract-section p {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 640px) {
  .hero-copy {
    padding-top: 2.5rem;
  }

  .section {
    padding: 3.25rem 0;
  }

  .btn {
    width: 100%;
  }
}