:root {
  --bg: #fbfbfd;
  --panel: #ffffff;
  --ink: #171923;
  --muted: #606779;
  --line: #e5e7ef;
  --accent: #6e3cc4;
  --accent-2: #0f7b8f;
  --soft: #f3eefc;
  --shadow: 0 18px 50px rgba(38, 31, 66, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

.hero {
  background:
    radial-gradient(circle at 20% 10%, rgba(110, 60, 196, 0.18), transparent 35%),
    radial-gradient(circle at 85% 25%, rgba(15, 123, 143, 0.16), transparent 32%),
    linear-gradient(135deg, #ffffff 0%, #f7f3ff 55%, #edf8fa 100%);
  border-bottom: 1px solid var(--line);
}

.nav {
  max-width: 1160px;
  margin: 0 auto;
  padding: 22px 28px 0;
  display: flex;
  justify-content: flex-end;
  gap: 22px;
  font-size: 0.95rem;
  font-weight: 650;
}

.hero-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 58px 28px 64px;
  text-align: center;
}

.venue,
.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  line-height: 1.12;
}

h1 {
  max-width: 1240px;
  margin: 0 auto 24px;
  font-size: clamp(2.05rem, 4.3vw, 4.35rem);
  letter-spacing: -0.055em;
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(1.8rem, 3.6vw, 3.15rem);
  letter-spacing: -0.045em;
}

h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
}

.authors {
  max-width: 900px;
  margin: 0 auto 10px;
  color: #2e3342;
  font-size: 1.06rem;
  font-weight: 620;
}

.affiliations {
  margin: 0 auto 30px;
  color: var(--muted);
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(110, 60, 196, 0.25);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font-weight: 750;
  box-shadow: 0 8px 24px rgba(38, 31, 66, 0.08);
}

.button:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.button.disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.section {
  max-width: 1160px;
  margin: 0 auto;
  padding: 72px 28px;
}

#demo {
  padding-top: 42px;
}

.section-heading {
  max-width: 860px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin-bottom: 10px;
}

.section-heading p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.section-heading.compact {
  margin-top: 44px;
  margin-bottom: 22px;
}

.method-detail {
  margin-top: 22px;
}

.tldr {
  padding-top: 58px;
}

.tldr > p {
  max-width: 900px;
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 1.1rem;
}

.cards,
.metric-grid,
.explain-grid,
.method-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card,
.metric,
.explain-card,
.step-card,
.figure,
.video-wrap,
pre {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.card {
  padding: 22px;
}

.card p,
.explain-card p {
  margin: 0;
  color: var(--muted);
}

.explain-grid {
  margin-top: 18px;
}

.explain-card {
  padding: 20px;
}

.method-steps {
  margin-top: 22px;
}

.step-card {
  padding: 22px;
}

.step-card h3 {
  margin-bottom: 8px;
}

.step-card p {
  margin: 0;
  color: var(--muted);
}

.math {
  color: #2c2440;
  font-weight: 760;
}

.figure {
  margin: 0;
  padding: 14px;
  overflow: hidden;
}

.figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
}

figcaption,
.caption {
  color: var(--muted);
  font-size: 0.95rem;
}

figcaption {
  padding: 12px 4px 2px;
}

.metric-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 24px;
}

.metric {
  padding: 22px;
}

.metric-value {
  display: block;
  color: var(--accent);
  font-size: clamp(1.7rem, 3.3vw, 2.55rem);
  line-height: 1;
  font-weight: 850;
  letter-spacing: -0.045em;
}

.metric-label {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-weight: 650;
}

.results-tables {
  display: grid;
  gap: 22px;
  margin: 24px 0 30px;
}

.table-figure {
  background: #fff;
}

.table-figure img {
  border-radius: 12px;
}

.split {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
  align-items: start;
}

.video-wrap {
  padding: 14px;
}

video {
  display: block;
  width: 100%;
  max-height: 680px;
  border-radius: 16px;
  background: #111;
}

.limitations {
  background: var(--soft);
  border: 1px solid rgba(110, 60, 196, 0.14);
  border-radius: 28px;
  padding: 42px;
}

.limitations ul {
  margin: 0;
  padding-left: 22px;
  color: #3b3d4d;
}

.limitations li + li {
  margin-top: 8px;
}

pre {
  margin: 0;
  padding: 22px;
  overflow-x: auto;
  white-space: pre;
  color: #2c2440;
  background: #f9f7ff;
  font-size: 0.9rem;
}

footer {
  margin-top: 32px;
  padding: 34px 28px;
  color: var(--muted);
  text-align: center;
  border-top: 1px solid var(--line);
  background: #fff;
}

@media (max-width: 860px) {
  .nav {
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
  }

  .cards,
  .metric-grid,
  .explain-grid,
  .method-steps,
  .split {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    padding-top: 46px;
    padding-bottom: 50px;
  }

  .section {
    padding-top: 48px;
    padding-bottom: 48px;
  }
}