:root {
  color-scheme: dark;
  --bg: #0a0c10;
  --bg-alt: #10141a;
  --panel: #151a22;
  --line: #232a35;
  --fg: #eef1f5;
  --muted: #9aa4b2;
  --red: #e83030;
  --red-soft: rgba(232, 48, 48, 0.14);
  --radius: 14px;
  --wrap: 1180px;
  --display: 'Space Grotesk', system-ui, sans-serif;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

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

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

/* hero */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  isolation: isolate;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(8, 10, 14, 0.94) 0%, rgba(8, 10, 14, 0.82) 38%, rgba(8, 10, 14, 0.25) 75%, rgba(8, 10, 14, 0.1) 100%),
    linear-gradient(0deg, var(--bg) 0%, rgba(10, 12, 16, 0) 28%),
    linear-gradient(180deg, rgba(8, 10, 14, 0.7) 0%, rgba(8, 10, 14, 0) 18%);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 22px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.brand img {
  width: 34px;
  height: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.95rem;
}

.nav-links a {
  text-decoration: none;
  color: #d3d9e1;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--fg);
}

.nav-links .nav-gh {
  color: var(--fg);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  padding: 6px 16px;
}

.hero-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 24px 120px;
}

.news {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--fg);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  padding: 5px 14px 5px 5px;
  backdrop-filter: blur(8px);
  transition: background 0.15s;
}

.news:hover {
  background: rgba(255, 255, 255, 0.13);
}

.news-tag {
  background: var(--red);
  color: #fff;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: 999px;
  padding: 2px 10px;
}

.hero h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.4rem, 5.4vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 28px 0 22px;
}

.lede {
  max-width: 38rem;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: #c9d0da;
  margin: 0 0 34px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 600;
  border-radius: 999px;
  padding: 13px 26px;
  transition: transform 0.15s, background 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--red);
  color: #fff;
}

.btn-primary:hover {
  background: #f04545;
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(10, 12, 16, 0.35);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.hero-caption {
  position: absolute;
  right: 24px;
  bottom: 84px;
  margin: 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
}

/* stats */

.stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  max-width: var(--wrap);
  margin: -56px auto 0;
  padding: 0 24px;
  position: relative;
}

.stat {
  padding: 22px 20px;
  border-left: 1px solid var(--line);
}

.stat:first-child {
  border-left: 0;
}

.stat b {
  display: block;
  font-family: var(--display);
  font-size: clamp(2rem, 3.6vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.03em;
}

.stat span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

/* sections */

.section {
  padding: 120px 0;
}

.section.alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.kicker {
  font-family: var(--mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--red);
  margin: 0 0 14px;
}

.section h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2rem, 4.2vw, 3.3rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
  max-width: 20ch;
}

.intro {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 40rem;
  margin: 0 0 56px;
}

/* loop */

.loop {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}

.step:hover {
  border-color: #38414f;
  transform: translateY(-2px);
}

.step-media {
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}

.step-media.light {
  background: #fff;
}

.step-media img,
.step-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.step-media.light img {
  object-fit: contain;
  padding: 10px;
}

.step-text {
  padding: 24px 26px 28px;
}

.step-n {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--red);
}

.step h3 {
  font-family: var(--display);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  margin: 4px 0 8px;
}

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

/* simulators */

.sims {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.sim {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.sim video {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: #000;
}

.sim figcaption {
  padding: 16px 18px 20px;
}

.sim b {
  display: block;
  font-family: var(--display);
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.sim span {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 4px;
}

/* benchmark */

.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 0 0 48px;
}

.chips li {
  font-family: var(--mono);
  font-size: 0.95rem;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 999px;
  padding: 8px 18px;
}

.chips li:first-child {
  border-color: var(--red);
  background: var(--red-soft);
}

.robots {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 12px;
}

.robots figure {
  margin: 0;
}

.robots img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #f4f5f7;
  border-radius: 12px;
  padding: 10px;
  transition: transform 0.2s;
}

.robots figure:hover img {
  transform: translateY(-3px);
}

.robots figcaption {
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
  margin-top: 8px;
  line-height: 1.3;
}

/* papers */

.featured {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 36px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  margin: 48px 0 64px;
}

.featured-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  border-radius: 10px;
  background: #fff;
}

.venue {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--red);
  margin: 0 0 8px;
}

.venue span {
  color: var(--muted);
  margin-left: 12px;
}

.featured h3,
.timeline h3 {
  font-family: var(--display);
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 0 0 10px;
}

.featured h3 {
  font-size: 1.65rem;
}

.featured h3 a,
.timeline h3 a {
  text-decoration: none;
}

.featured h3 a:hover,
.timeline h3 a:hover {
  text-decoration: underline;
  text-decoration-color: var(--red);
  text-underline-offset: 4px;
}

.summary {
  color: #c4cbd5;
  margin: 0 0 10px;
}

.authors {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 14px;
}

.links {
  margin: 0;
}

.links a {
  display: inline-block;
  margin-right: 18px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--fg);
  border-bottom: 1px solid var(--red);
}

.links a:hover {
  color: var(--red);
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 34px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.timeline li {
  display: grid;
  grid-template-columns: 70px 240px 1fr;
  gap: 28px;
  align-items: start;
  padding: 26px 0;
  position: relative;
}

.year {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
  background: var(--bg-alt);
  text-align: center;
  padding: 4px 0;
  position: relative;
}

.tl-thumb img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
  transition: transform 0.2s;
}

.tl-thumb:hover img {
  transform: scale(1.02);
}

.timeline h3 {
  font-size: 1.2rem;
}

/* footer */

.footer {
  padding: 72px 0 80px;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-inner {
  text-align: center;
}

.footer-logo {
  width: 220px;
  margin: 0 auto 20px;
}

.footer a {
  color: var(--fg);
}

/* responsive */

@media (max-width: 1000px) {
  .sims {
    grid-template-columns: repeat(2, 1fr);
  }

  .robots {
    grid-template-columns: repeat(5, 1fr);
  }

  .featured {
    grid-template-columns: 1fr;
  }

  .timeline li {
    grid-template-columns: 70px 180px 1fr;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .wrap,
  .topbar,
  .hero-body,
  .stats {
    padding-left: 16px;
    padding-right: 16px;
  }

  .nav-links a:not(.nav-gh) {
    display: none;
  }

  .hero-shade {
    background:
      linear-gradient(0deg, var(--bg) 0%, rgba(8, 10, 14, 0.86) 45%, rgba(8, 10, 14, 0.55) 100%);
  }

  .hero-body {
    justify-content: flex-end;
    padding-bottom: 96px;
  }

  .hero-caption {
    left: 16px;
    right: auto;
    bottom: 18px;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 0;
  }

  .stat {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 18px 4px;
  }

  .stat:last-child {
    grid-column: span 2;
  }

  .section {
    padding: 80px 0;
  }

  .intro {
    margin-bottom: 36px;
  }

  .loop,
  .sims {
    grid-template-columns: 1fr;
  }

  .sim video {
    aspect-ratio: 16 / 10;
  }

  .robots {
    grid-template-columns: repeat(3, 1fr);
  }

  .featured {
    padding: 14px;
    gap: 20px;
  }

  .featured h3 {
    font-size: 1.35rem;
  }

  .timeline::before {
    display: none;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .year {
    text-align: left;
    background: none;
    padding: 0;
  }
}

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

  .step,
  .btn,
  .robots img,
  .tl-thumb img {
    transition: none;
  }
}