:root {
  --bg: #f7f8fb;
  --paper: #ffffff;
  --ink: #162033;
  --muted: #647083;
  --line: #dfe5ef;
  --accent: #2b65f6;
  --accent-dark: #1749be;
  --shadow: 0 16px 40px rgba(19, 32, 53, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
}

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

a:hover {
  color: var(--accent-dark);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 22px;
}

.brand {
  color: var(--ink);
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 20px;
  font-size: 0.95rem;
}

.hero {
  padding: 92px 22px 52px;
  background:
    radial-gradient(circle at top left, rgba(43, 101, 246, 0.16), transparent 32rem),
    linear-gradient(180deg, #fff 0%, var(--bg) 100%);
}

.hero-inner {
  max-width: 1040px;
  margin: 0 auto;
  text-align: center;
}

h1 {
  max-width: 1180px;
  margin: 0 auto 22px;
  font-size: clamp(2rem, 2.9vw, 2.55rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h1 span {
  display: block;
  white-space: nowrap;
}

h2 {
  margin: 0 0 22px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: 0;
  text-align: center;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
  line-height: 1.35;
}

.authors {
  margin: 0 auto 8px;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 650;
}

.affiliation {
  margin: 0 auto 22px;
  color: var(--muted);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 104px;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(22, 32, 51, 0.06);
}

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

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 54px 22px;
}

.section.narrow {
  max-width: 820px;
}

.section p {
  color: var(--muted);
  font-size: 1.02rem;
}

.main-video,
.video-grid video {
  display: block;
  width: 100%;
  border-radius: 10px;
  background: #111827;
  box-shadow: var(--shadow);
}

.main-video {
  max-height: 660px;
}

.figure-card {
  margin: 0 0 28px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.figure-card img {
  display: block;
  width: 100%;
  border-radius: 6px;
}

.figure-card figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.grid {
  display: grid;
  gap: 20px;
  margin: 26px 0;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: 0 10px 28px rgba(19, 32, 53, 0.06);
}

.grid article p {
  margin: 0;
  font-size: 0.97rem;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.video-grid article {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.video-grid h3 {
  margin: 12px 4px 2px;
}

.table-wrap {
  overflow-x: auto;
  margin: 24px 0 36px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  background: #eef3ff;
  color: #24324a;
}

td:last-child,
th:last-child {
  color: var(--accent-dark);
  font-weight: 800;
}

.average td {
  background: #f7faff;
  font-weight: 800;
}

pre {
  overflow-x: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #111827;
  color: #d8e3f8;
  line-height: 1.5;
}

.footer {
  padding: 30px 22px 46px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 780px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 12px;
  }

  .hero {
    padding-top: 58px;
  }

  .grid.three,
  .grid.two,
  .video-grid {
    grid-template-columns: 1fr;
  }

  h1 span {
    display: inline;
    white-space: normal;
  }
}