*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0f;
  --bg-card: #12121a;
  --bg-card-hover: #1a1a2e;
  --border: #1e1e32;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-light: #8b5cf6;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a855f7);
  --gradient-text: linear-gradient(135deg, #818cf8, #a78bfa, #c084fc);
  --radius: 12px;
  --radius-lg: 16px;
  --max-width: 1200px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent-light); text-decoration: none; transition: color 0.2s; }
a:hover { color: #c4b5fd; }

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
}

.nav-logo img { height: 32px; width: 32px; }
.nav-logo span { font-weight: 700; font-size: 17px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 8px;
  background: var(--gradient);
  color: #fff !important;
  font-weight: 600;
  font-size: 14px;
}

.nav-cta:hover { opacity: 0.92; }

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
}

/* Hero */
.hero {
  padding: 140px 0 80px;
  background: radial-gradient(ellipse at 50% 0%, var(--accent-glow) 0%, transparent 55%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 100px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero h1 .highlight {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--text-secondary);
  max-width: 720px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.meta-pill {
  padding: 10px 16px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 13px;
}

.meta-pill strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 2px;
}

.meta-pill span { color: var(--text-muted); font-size: 12px; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  background: var(--gradient);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #fff;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border: 1px solid var(--border);
  transition: border-color 0.2s, background 0.2s;
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--bg-card);
  color: var(--text);
}

/* Sections */
section { padding: 88px 0; }
section.alt { background: rgba(18, 18, 26, 0.5); }

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
}

.section-header { margin-bottom: 48px; }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.card {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: border-color 0.2s, transform 0.2s, background 0.2s;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  background: rgba(99, 102, 241, 0.12);
  margin-bottom: 16px;
}

/* Timeline */
.timeline { display: flex; flex-direction: column; gap: 0; }

.timeline-entry {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.timeline-entry:last-child { border-bottom: none; }

.timeline-year {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-light);
  padding-top: 4px;
}

.timeline-body h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}

.timeline-body p,
.timeline-body li {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.timeline-body ul {
  margin: 12px 0 0 20px;
}

.timeline-body li { margin-bottom: 6px; }

/* Link lists */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.link-item {
  display: block;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  transition: all 0.2s;
}

.link-item:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  color: var(--text);
}

.link-item span {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 4px;
}

/* Publications */
.pub-list { display: flex; flex-direction: column; gap: 16px; }

.pub-item {
  padding: 22px 24px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.pub-item h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.pub-item h4 a { color: var(--text); }
.pub-item h4 a:hover { color: var(--accent-light); }

.pub-meta {
  font-size: 13px;
  color: var(--text-muted);
}

/* Steps */
.steps { display: flex; flex-direction: column; gap: 16px; }

.step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  align-items: start;
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  background: var(--gradient);
  color: #fff;
}

.step h4 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.step p { font-size: 14px; color: var(--text-secondary); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  padding: 22px 24px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.faq-item h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.faq-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Social */
.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.social-link {
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.social-link:hover {
  color: var(--text);
  border-color: var(--accent);
}

/* Footer */
footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

footer p {
  font-size: 13px;
  color: var(--text-muted);
}

footer a { color: var(--text-secondary); }

/* Mobile nav */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px 24px;
  }

  .nav-links.open { display: flex; }

  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 12px 0; }

  .mobile-toggle { display: block; }

  .timeline-entry {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  section { padding: 64px 0; }
}