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

:root {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-hover: #334155;
  --color-border: #334155;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-accent: #38bdf8;
  --color-accent-soft: rgba(56, 189, 248, 0.1);
  --radius: 12px;
  --container-width: 900px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Hero */

.hero {
  padding: 5rem 0 3rem;
  text-align: center;
}

.avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

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

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

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

.tagline {
  margin-top: 0.5rem;
  font-size: 1.05rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}

.social-links a:hover,
.social-links a:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-accent-soft);
}

.social-links a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Sections */

.section {
  margin-bottom: 3rem;
}

.section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

/* Cards */

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--color-accent);
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-accent);
}

.card p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

.card .education-institution {
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.dissertation-link {
  margin-top: 0.75rem;
  font-size: 0.95rem;
}

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

.dissertation-link a:hover,
.dissertation-link a:focus-visible {
  text-decoration: underline;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

/* Tags */

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.tag-list li {
  background-color: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  white-space: nowrap;
}

/* Footer */

.footer {
  margin-top: 2rem;
  padding: 2rem 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

/* Responsive */

@media (max-width: 600px) {
  .hero {
    padding: 3rem 0 2rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}