:root {
  --bg: #050805;
  --surface: #0f150b;
  --surface-alt: #121c10;
  --text: #f5f7f1;
  --muted: #b9c3b2;
  --accent: #D5FFA6;
  --accent-strong: #95f2f5;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 35px 60px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Inter", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover,
a:focus {
  color: var(--accent-strong);
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

section {
  scroll-margin-top: 90px;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 4vw;
  background: rgba(5, 10, 4, 0.85);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.logo {
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.top-nav__links {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.top-nav__links a {
  padding: 0.25rem 0.4rem;
  border-radius: 999px;
  color: var(--muted);
}

.top-nav__links a:hover,
.top-nav__links a:focus {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.hero {
  background: radial-gradient(circle at 20% 20%, rgba(157, 216, 108, 0.18), transparent 50%),
    radial-gradient(circle at 80% 0%, rgba(136, 190, 209, 0.12), transparent 40%),
    linear-gradient(135deg, #040805, #0d1609 60%, #030402);
  padding-bottom: 2rem;
}

.hero__content {
  display: grid;
  grid-template-columns: minmax(340px, 1.4fr) minmax(200px, 0.6fr);
  gap: 3rem;
  align-items: start;
  padding: 5rem 0 3rem;
}

.hero__text h1 {
  font-size: clamp(2.4rem, 4vw, 3.5rem);
  margin-bottom: 1rem;
}

.hero__lead {
  font-size: 1.1rem;
  color: var(--muted);
}

.hero__meta {
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1.2rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.85rem;
  color: var(--accent-strong);
  margin-bottom: 1.5rem;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.btn {
  padding: 0.65rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #041104;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover,
.btn:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn--accent:hover,
.btn--accent:focus {
  background: var(--accent-strong);
  color: #041104;
}

.social-links {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.social-link {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: grid;
  place-items: center;
  color: var(--text);
  transition: background 0.2s ease, transform 0.2s ease;
}

.social-link svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.social-link svg.social-icon--fill {
  fill: currentColor;
  stroke: none;
}

.social-link:hover,
.social-link:focus {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.hero__media {
  justify-self: end;
  align-self: center;
}

.hero__media figure {
  width: min(250px, 70vw);
  margin: 0 auto;
  padding: 1rem;
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.hero__scroll {
  display: inline-block;
  margin-left: 4vw;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border);
}

.section--alt {
  background: var(--surface);
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.section p {
  max-width: 780px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  padding: 1.5rem;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.25);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-size: 1.2rem;
  color: var(--accent-strong);
}

.papers {
  display: grid;
  gap: 1.5rem;
}

.paper {
  padding: 1.25rem 1.5rem;
  border-radius: 1rem;
  background: var(--surface-alt);
  border-left: 4px solid var(--accent);
  border-right: 1px solid var(--border);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.paper__title {
  font-size: 1.1rem;
  font-weight: 600;
  display: inline-block;
}

.paper__status {
  color: var(--muted);
  margin: 0.5rem 0;
}

.paper__link {
  font-size: 0.95rem;
}

.panel {
  background: linear-gradient(120deg, rgba(157, 216, 108, 0.12), rgba(240, 180, 94, 0.12));
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  padding: 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: safe center;
  justify-content: space-evenly;
  gap: 1.25rem;
}

.contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer {
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: #040704;
}

@media (max-width: 900px) {
  .hero__content {
    grid-template-columns: 1fr;
  }

  .hero__media {
    justify-self: center;
  }
}

@media (max-width: 600px) {
  .top-nav {
    position: static;
    flex-direction: column;
    align-items: flex-start;
  }

  .hero__content {
    padding-top: 3rem;
  }

  .hero__media figure {
    padding: 0.5rem;
  }

  .panel,
  .contact {
    flex-direction: column;
    align-items: flex-start;
  }
}