:root {
  --primary: #1f3a56;    /* deep blue */
  --secondary: #2c4d6e;  /* slightly lighter blue */
  --accent: #26a269;     /* calm green */
  --bg: #f5f7fa;         /* light grey */
  --text: #1a2733;       /* dark slate */
  --muted: #5b6b7b;      /* muted grey */
  --white: #ffffff;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(0,0,0,0.08);
}

* { box-sizing: border-box }
html, body { height: 100% }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessibility: skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--white);
  padding: 8px 12px;
  border-radius: 0 0 8px 0;
  transition: top .2s;
  z-index: 1000;
}
.skip-link:focus { top: 0 }

header {
  background: var(--primary);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 4px 18px rgba(0,0,0,0.12);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.containerResearch {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}



.container-intro {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}
.containerContact {
  max-width: auto;
  margin: 0 auto;
  padding: 0 0px;
}


/* Nav */
.nav {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
}
.brand {
  font-weight: 700;
  letter-spacing: .2px;
}
.brand small {
  display: block;
  font-weight: 600;
  color: #cfe3ff;
  margin-top: 2px;
  letter-spacing: .3px;
}
.menu-btn {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.35);
  color: var(--white);
  padding: 8px 12px;
  border-radius: 8px;
}


nav ul {
  list-style: none;
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 8px;
}
nav a:hover,
nav a:focus { background: rgba(255,255,255,0.12) }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--secondary), #1b2c42 60%);
  color: var(--white);
  padding: 20px 0 20px;
}
.hero-inner {
  display: grid;
  gap: 10px;
  align-items: center;
  grid-template-columns: 1.45fr .55fr;
}

.hero-contact-card {
  display: grid;
  gap: 0px;
  align-items: center;
  grid-template-columns: 1.45fr .55fr;
}

  
.hero-outer {
  background: linear-gradient(135deg, var(--secondary), #1b2c55 60%);
  display: grid;
  gap: 18px;
  align-items: center;
  grid-template-columns: 1.25fr .75fr;
}

.hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  margin: 0 0 8px;
  line-height: 1.25;
}
.hero p {
  color: #cfe3ff;
  font-size: 1.05rem;
  max-width: 680px;
  margin: 0;
}
.hero-cta {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 16px;
  border-radius: 10px;
  transition: transform .05s ease-in-out, box-shadow .2s;
  box-shadow: var(--shadow);
}
.btn-primary { background: var(--accent); color: var(--white)}
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.4);
}
.btn:hover { transform: translateY(-1px) }



.hero-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(6px);
  padding: 16px;
  border-radius: var(--radius);
}

.hero-card-publications {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(6px);
  padding: 16px;
  border-radius: var(--radius);
}


.hero-card-contact {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(6px);
  padding: 100px;
  border-radius: var(--radius);
}

.hero-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: #e3f6ff;
  letter-spacing: .3px;
  text-transform: uppercase;
}
.hero-card ul {
  margin: 0;
  padding-left: 18px;
  color: #d9e9ff;
}

/* Bio / intro section */
.intro {
  padding: 36px 0 18px;
}
.intro .card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  align-items: center;
}

.cardNew {
  background: var(--white);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 10px;
  align-items: center;
}

.cardContact {
  background: var(--white);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 10px;
  align-items: center;
  width: 500px;
}


.avatar {
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: 50%;
  background: linear-gradient(135deg, #c2d7ff, #a5f3c6);
  border: 3px solid var(--bg);
}


.avatarNew {
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: 50%;
  background: linear-gradient(135deg, #c2d7ff, #a5f3c6);
  border: 3px solid var(--bg);
}

.introContact{
  background: var(--white);
  border-radius: var(--radius);
  padding: 0px;
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 10px;
  align-items: center;
}
.introContact h2 { margin: 0 0 6px; color: var(--muted) }


.introNew h2 { margin: 0 0 6px; color: var(--muted) }
.introNew p { margin: 0; color: var(--muted) }

.intro h2 { margin: 0 0 6px }
.intro p { margin: 0; color: var(--muted) }

/* Quick links */
.quick {
  padding: 12px 0 40px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.gridResearch {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}


.gridTeaching {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}


.tile {
  background: var(--white);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 8px;
}
.tile h3 {
  margin: 0;
  font-size: 1.05rem;
}
.tile p {
  margin: 0;
  color: var(--muted);
}
.tile a {
  margin-top: 8px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}
.tile a:hover { text-decoration: underline }

section {
  display: block;
  width: 100%;
  clear: both;
}

/* Footer */
footer {
  background: var(--primary);
  color: var(--white);
  padding: 22px 0;
  margin-top: 28px;
}
footer .footer-inner {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}
.social {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.social a {
  color: #cfe3ff;
  text-decoration: none;
  font-weight: 600;
}

/* Responsive */

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr }
  .intro .card { grid-template-columns: 80px 1fr }
  .grid { grid-template-columns: repeat(2, 1fr) }
}
/*
@media (max-width: 560px) {
  .menu-btn { display: inline-block }
  nav ul { display: none }
  nav[aria-expanded="true"] ul { display: flex; flex-direction: column; gap: 8px; }
  .grid { grid-template-columns: 1fr }
  .hero { padding: 48px 0 40px }
}
*/

/* Responsive layout shift */
@media (max-width: 560px) {
  .menu-btn { display: inline-block }
  nav ul {
    flex-direction: column;   /* stack vertically */
    gap: 8px;
    width: 100%;
  }
  nav a {
    display: block;
    width: 100%;              /* full-width tap targets */
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.15);
  }
  nav a:hover {
    background: rgba(255,255,255,0.12);
  }
}