:root {
  --bg: #030711;
  --surface: rgba(7, 12, 23, 0.9);
  --surface-light: rgba(10, 18, 33, 0.85);
  --fg: #e9f4ff;
  --muted: #9fb6d6;
  --accent: #50f5c0;
  --accent-2: #5a6bff;
  --border: rgba(255, 255, 255, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.bg-grid,
.bg-gradient,
.bg-noise {
  position: fixed;
  inset: 0;
  z-index: -2;
}

.bg-grid {
  background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
}

.bg-gradient {
  background: radial-gradient(circle at 20% 20%, rgba(80, 245, 192, 0.18), transparent 30%),
    radial-gradient(circle at 80% 10%, rgba(90, 107, 255, 0.35), transparent 40%),
    radial-gradient(circle at 40% 80%, rgba(255, 94, 188, 0.25), transparent 40%);
  filter: blur(40px);
}

.bg-noise {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Crect width='1' height='1' fill='rgba(255,255,255,0.08)'/%3E%3C/svg%3E");
  opacity: 0.35;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(3, 7, 17, 0.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.logo {
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.nav-actions {
  display: flex;
  gap: 0.75rem;
  margin-left: auto;
}

.btn {
  border-radius: 999px;
  padding: 0.7rem 1.4rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s;
}

.btn-primary {
  background: linear-gradient(120deg, #4ef7d4, #5a6bff);
  color: #051221;
  border: none;
  box-shadow: 0 15px 40px rgba(90, 107, 255, 0.35);
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: rgba(80, 245, 192, 0.4);
}

.btn:hover {
  transform: translateY(-2px);
}

.hero {
  padding: 5rem 1.5rem 6rem;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4.6rem);
  margin: 1rem 0;
}

.subtitle {
  font-size: 1.2rem;
  color: var(--muted);
  line-height: 1.8;
}

.hero-buttons {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-stats {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.hero-stats div {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.2rem;
  background: rgba(4, 10, 22, 0.8);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-stats span {
  display: block;
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.main-content {
  background: rgba(3, 6, 15, 0.85);
  border-radius: 32px 32px 0 0;
  margin-top: -2rem;
  position: relative;
  z-index: 1;
  box-shadow: 0 -20px 60px rgba(0, 0, 0, 0.45);
}

.section {
  padding: 4rem max(5vw, 1.5rem);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 2.5rem;
}

.section h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--muted);
  line-height: 1.6;
}

.abstract {
  max-width: 900px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--muted);
}

.abstract em {
  color: var(--accent);
}

.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 1.5rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card h3 {
  margin-top: 0;
}

.card p {
  color: var(--muted);
  line-height: 1.6;
}

.sectors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.sector-item {
  background: var(--surface-light);
  border: 1px solid rgba(90, 107, 255, 0.25);
  border-radius: 20px;
  padding: 1.6rem;
}

.sector-item h4 {
  margin-top: 0;
  color: var(--accent);
}

.timeline {
  border-left: 2px solid rgba(255, 255, 255, 0.08);
  padding-left: 1.5rem;
  max-width: 800px;
  margin: 0 auto 2.5rem;
}

.timeline article {
  margin-bottom: 1.8rem;
  position: relative;
  padding-left: 0.75rem;
}

.timeline article::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px rgba(80, 245, 192, 0.7);
}

.timeline h3 {
  margin: 0 0 0.4rem;
}

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

.experiment-setup {
  background: rgba(6, 13, 29, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 1.8rem;
  max-width: 900px;
  margin: 0 auto;
}

.experiment-setup p {
  margin: 0 0 0.8rem;
}

.figure-stack {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  max-width: 1100px;
  margin: 0 auto;
}

.figure-full {
  background: rgba(7, 14, 28, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 28px;
  padding: 2rem;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.45);
}

.figure-full h3 {
  margin-top: 0;
}

.figure-full p {
  color: var(--muted);
  line-height: 1.6;
}

.figure-canvas {
  width: 100%;
  margin-top: 1.5rem;
  border-radius: 18px;
  display: block;
  background: transparent;
}

.download-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

}

@media (max-width: 600px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }

  .timeline {
    border-left: none;
    padding-left: 0;
  }

  .timeline article::before {
    left: 0;
  }
}