:root {
  --bg: #0b1021;
  --text: #e8ebf0;
  --muted: #a7b0c0;
  --primary: #60e7f7;
  --accent: #a78bfa;
  --card: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.14);
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  color: var(--text);
  background: var(--bg) no-repeat center/cover fixed;
  line-height: 1.6;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.25), rgba(0,0,0,0.55));
  pointer-events: none;
  z-index: -1;
}

/* Background images per page */
body[data-bg="home"] { background-image: url("../images/backgrounds/home.png"); }
body[data-bg="experience"] { background-image: url("../images/backgrounds/experience.png"); }
body[data-bg="teaching"] { background-image: url("../images/backgrounds/teaching.png"); }
body[data-bg="conferences"] { background-image: url("../images/backgrounds/conferences.png"); }
body[data-bg="interests"] { background-image: url("../images/backgrounds/interests.png"); }
body[data-bg="travel"] { background-image: url("../images/backgrounds/travel.png"); }
body[data-bg="contact"] { background-image: url("../images/backgrounds/contact.png"); }

.nav {
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(10px);
  background: rgba(3,8,20,0.35);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-weight: 700;
  letter-spacing: .2px;
}

.brand .dot { color: var(--accent); }

.nav a {
  color: var(--text);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 8px;
}

.nav a:hover, .nav a:focus {
  outline: none;
  background: rgba(255,255,255,0.08);
}

.links {
  display: flex; gap: 6px; flex-wrap: wrap;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 72px;
}

.hero {
  padding: 80px 0 10px;
}

h1 {
  font-size: clamp(36px, 5vw, 56px);
  margin: 0 0 12px;
  line-height: 1.1;
  letter-spacing: .3px;
}

.gradient-text {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtle {
  color: var(--muted);
  font-size: 18px;
}

.actions { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }
.button, .chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow);
}

.button:hover { transform: translateY(-1px); }

.section { margin-top: 42px; }
.section h2 {
  font-size: clamp(26px, 3.8vw, 36px);
  margin-bottom: 12px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.timeline {
  position: relative;
  margin-left: 10px;
  padding-left: 20px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 0; bottom: 0;
  border-left: 2px dashed var(--border);
}

.item {
  position: relative;
  padding-left: 14px;
  margin-bottom: 18px;
}

.item::before {
  content: "";
  position: absolute;
  left: -2px; top: 8px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 3px rgba(96,231,247,0.18);
}

.kicker {
  text-transform: uppercase;
  letter-spacing: .8px;
  font-size: 12px;
  color: var(--muted);
}

.role { font-weight: 700; }
.org { color: var(--primary); }
.time { color: var(--muted); }

.list { margin: 8px 0 0 18px; }
.list li { margin: 6px 0; }

footer {
  margin-top: 60px;
  padding: 30px 20px;
  text-align: center;
  color: var(--muted);
}

.badge {
  font-size: 13px;
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(167,139,250,0.2);
  border: 1px solid var(--border);
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; }

/* Responsive helpers */
@media (max-width: 640px) {
  .links { display: none; }
}

.avatar {
  width: 256px; height: 256px;
  border-radius: 50%;
  object-fit: cover;
}