:root {
  --bg: #050816;
  --bg-soft: #0b1020;
  --fg: #f5f5f5;
  --muted: #9ca3af;
  --accent: #8b5cf6;
  --accent-soft: rgba(139, 92, 246, 0.16);
  --border: rgba(148, 163, 253, 0.16);
  --radius: 14px;
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
               Segoe UI, Roboto, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --transition-fast: 0.18s ease-out;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: var(--font-main);
  background:
    radial-gradient(circle at top, #111827 0, #020817 55%, #000 100%);
  color: var(--fg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 32px;
  backdrop-filter: blur(14px);
  background: radial-gradient(circle at top,
              rgba(15,23,42,0.98),
              rgba(2,6,23,0.98));
  border-bottom: 1px solid rgba(148,163,253,0.16);
}

.logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: 14px;
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 14px;
  align-items: center;
  font-size: 13px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 5px 8px;
  border-radius: 999px;
  transition: color var(--transition-fast),
              background var(--transition-fast),
              transform var(--transition-fast);
}

.nav a:hover {
  color: var(--fg);
  background: rgba(148,163,253,0.14);
  transform: translateY(-1px);
}

#theme-toggle {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--accent);
  border-radius: 999px;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  font-size: 8px;
  cursor: pointer;
  padding: 0;
}

/* Hero */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(260px, 1.4fr);
  gap: 32px;
  padding: 56px 32px 40px;
  max-width: 1080px;
  margin: 0 auto;
}

.hero-text h1 {
  font-size: 40px;
  margin: 0 0 6px;
  letter-spacing: 0.01em;
}

.hero-role {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 500;
}

.hero-copy {
  margin: 0 0 18px;
  color: var(--muted);
  max-width: 520px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.hero-links a {
  padding: 6px 11px;
  font-size: 13px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--fg);
  text-decoration: none;
  background: rgba(15,23,42,0.9);
  transition: all var(--transition-fast);
}

.hero-links a:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.hero-panel {
  padding: 14px 14px 10px;
  background: linear-gradient(to bottom right,
              rgba(15,23,42,0.97),
              rgba(2,6,23,1));
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 18px 50px rgba(15,23,42,0.6);
  font-size: 13px;
  color: var(--muted);
}

.hero-panel h2 {
  margin: 0 0 6px;
  font-size: 14px;
  color: var(--accent);
}

.hero-tags {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.hero-tags li {
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(75,85,99,0.9);
  color: var(--muted);
  font-size: 10px;
  background: rgba(10,16,30,1);
}

/* Sections */

.section {
  padding: 26px 32px 10px;
  max-width: 1080px;
  margin: 0 auto;
}

.section-title {
  font-size: 18px;
  margin: 0 0 14px;
  color: var(--fg);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

/* Cards */

.card {
  padding: 12px 12px 10px;
  border-radius: var(--radius);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  box-shadow: 0 10px 28px rgba(15,23,42,0.55);
  font-size: 13px;
  color: var(--muted);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              border-color var(--transition-fast),
              background var(--transition-fast);
}

.card h3 {
  margin: 0 0 4px;
  font-size: 14px;
  color: var(--fg);
}

.card .meta {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 4px;
}

.card a {
  font-size: 12px;
  color: var(--accent);
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(15,23,42,0.7);
  border-color: var(--accent-soft);
}

/* Timeline */

.timeline {
  display: grid;
  gap: 12px;
  font-size: 13px;
  color: var(--muted);
}

.timeline-item {
  padding: 10px 12px 8px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(5,10,22,0.98);
  box-shadow: 0 10px 24px rgba(15,23,42,0.6);
}

.timeline-item h3 {
  margin: 0;
  font-size: 14px;
  color: var(--fg);
}

.timeline-item .meta {
  font-size: 11px;
  color: var(--muted);
  margin: 2px 0 4px;
}

.timeline-item ul {
  margin: 0;
  padding-left: 16px;
}

/* Publications */

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--muted);
}

.list li {
  margin-bottom: 6px;
}

.list a {
  margin-left: 4px;
  color: var(--accent);
  text-decoration: none;
  font-size: 12px;
}

.list a:hover {
  text-decoration: underline;
}

/* Contact */

.mono {
  font-family: var(--font-mono);
}

/* Footer */

.site-footer {
  padding: 18px 32px 24px;
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  border-top: 1px solid rgba(31,41,55,1);
  background: #020817;
}

.site-footer .dot {
  margin: 0 6px;
}

/* Responsive */

@media (max-width: 768px) {
  .site-header {
    padding-inline: 16px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-inline: 16px;
  }

  .section {
    padding-inline: 16px;
  }
}