/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --clr-bg:        #f8f9fb;
  --clr-surface:   #ffffff;
  --clr-text:      #1e1e2f;
  --clr-text-light:#555566;
  --clr-primary:   #2a4a7f;
  --clr-primary-l: #3b6cb0;
  --clr-accent:    #d4a843;
  --clr-border:    #e0e2e6;
  --clr-muted:     #6c6c80;
  --radius:        12px;
  --shadow:        0 2px 16px rgba(0,0,0,0.06);
  --shadow-hover:  0 8px 28px rgba(0,0,0,0.10);
  --transition:    0.25s ease;
  --max-w:         960px;
  --font-sans:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* ============================================================
   Section titles
   ============================================================ */
.section-title {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 40px;
  height: 3px;
  background: var(--clr-primary);
  border-radius: 2px;
}

/* ============================================================
   1. Hero
   ============================================================ */
.hero {
  background: linear-gradient(135deg, var(--clr-primary) 0%, #1b2f4e 100%);
  color: #fff;
  text-align: center;
  padding: 5rem 1.5rem 4rem;
}

.hero-content {
  max-width: 640px;
  margin: 0 auto;
}

.avatar {
  width: 88px;
  height: 88px;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  font-size: 2.4rem;
  color: rgba(255,255,255,0.85);
  backdrop-filter: blur(4px);
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  font-weight: 400;
  opacity: 0.85;
  margin-bottom: 0.6rem;
}

.hero-tagline {
  font-size: 0.95rem;
  opacity: 0.65;
  max-width: 460px;
  margin: 0 auto;
}

/* ============================================================
   2. Quick Links
   ============================================================ */
.quick-links {
  background: var(--clr-surface);
  padding: 2rem 0;
  border-bottom: 1px solid var(--clr-border);
}

.link-grid {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.link-card {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
  border: 1px solid var(--clr-border);
  color: var(--clr-text);
}

.link-card i {
  font-size: 1.2rem;
}

.link-card.orcid i     { color: #a6ce39; }
.link-card.linkedin i  { color: #0a66c2; }
.link-card.github i    { color: #24292e; }

.link-card:hover {
  background: var(--clr-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* ============================================================
   4. Research
   ============================================================ */
.research {
  padding: 4rem 0;
  background: var(--clr-bg);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.research-item {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  transition: box-shadow var(--transition), transform var(--transition);
}

.research-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.research-item-icon {
  font-size: 1.4rem;
  color: var(--clr-primary);
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.research-item-info {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.research-item-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-text);
}

.research-item-venue {
  font-size: 0.82rem;
  color: var(--clr-muted);
}

.research-item-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.15rem;
}

.research-link {
  font-size: 0.85rem;
  color: var(--clr-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 500;
  transition: color var(--transition);
}

.research-link:hover {
  color: var(--clr-primary-l);
}

/* ============================================================
   5. CV (Europass)
   ============================================================ */
.cv {
  padding: 4rem 0;
  background: var(--clr-surface);
}

.cv-content {
  text-align: center;
}

.cv-button {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 2rem;
  background: var(--clr-primary);
  color: #fff;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
}

.cv-button i {
  font-size: 1.15rem;
}

.cv-button:hover {
  background: var(--clr-primary-l);
  transform: translateY(-2px);
}

/* ============================================================
   6. Timeline (Experience / Education)
   ============================================================ */
.experience {
  padding: 4rem 0;
  background: var(--clr-bg);
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--clr-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 1.25rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-surface);
  border: 2px solid var(--clr-primary);
}

.timeline-date {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--clr-primary);
  display: block;
  margin-bottom: 0.2rem;
}

.timeline-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.1rem;
}

.timeline-org {
  font-size: 0.9rem;
  color: var(--clr-text-light);
  margin-bottom: 0.35rem;
}

.timeline-content p:last-child {
  font-size: 0.9rem;
  color: var(--clr-muted);
}

/* ============================================================
   7. Contact
   ============================================================ */
.contact {
  padding: 4rem 0;
  background: var(--clr-bg);
}

.contact-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 460px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.95rem;
}

.contact-item i {
  width: 20px;
  color: var(--clr-primary);
  text-align: center;
  font-size: 1.1rem;
}

.contact-item a {
  color: var(--clr-text);
  text-decoration: none;
  transition: color var(--transition);
}

.contact-item a:hover {
  color: var(--clr-primary);
}

/* ============================================================
   8. Footer
   ============================================================ */
.footer {
  background: var(--clr-primary);
  color: rgba(255,255,255,0.8);
  padding: 2rem 0;
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1rem;
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 1.15rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .hero { padding: 3.5rem 1rem 3rem; }

  .research-grid { grid-template-columns: 1fr; }
  .link-grid { gap: 0.75rem; }
  .link-card { padding: 0.55rem 1rem; font-size: 0.85rem; }
  .footer-content { flex-direction: column; text-align: center; }
}