/* ── Reset & Base ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: #f8f9fa;
  color: #2d3436;
  line-height: 1.7;
}
a { color: #0984e3; text-decoration: none; transition: color .2s; }
a:hover { color: #6c5ce7; }

/* ── Layout ── */
.container { max-width: 860px; margin: 0 auto; padding: 0 24px; }

/* ── Nav ── */
nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #eee;
}
nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
nav .logo { font-weight: 700; font-size: 1.1rem; color: #2d3436; }
nav ul { list-style: none; display: flex; gap: 24px; }
nav ul a { color: #636e72; font-size: .9rem; font-weight: 500; }
nav ul a:hover { color: #0984e3; }

/* ── Hero / Profile ── */
.hero {
  display: flex; align-items: center; gap: 48px;
  padding: 72px 0 56px;
}
.avatar {
  width: 180px; height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid #dfe6e9;
  flex-shrink: 0;
}
.hero h1 { font-size: 2rem; margin-bottom: 8px; }
.hero .tagline { color: #636e72; font-size: 1.05rem; margin-bottom: 16px; }
.contact-links { display: flex; gap: 20px; flex-wrap: wrap; }
.contact-links a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px;
  border: 1px solid #dfe6e9;
  border-radius: 20px;
  font-size: .88rem;
  color: #2d3436;
  transition: all .2s;
}
.contact-links a:hover {
  background: #0984e3; color: #fff; border-color: #0984e3;
}
.contact-links svg { width: 16px; height: 16px; fill: currentColor; }

/* ── Section ── */
section { padding: 48px 0; }
section + section { border-top: 1px solid #eee; }
.section-title {
  font-size: 1.4rem; font-weight: 700; margin-bottom: 28px;
  display: flex; align-items: center; gap: 10px;
}
.section-title::before {
  content: ""; width: 4px; height: 24px;
  background: #0984e3; border-radius: 2px;
}

/* ── Plain Lists (Projects & Papers) ── */
.plain-list {
  list-style: disc;
  padding-left: 1.4em;
  display: flex; flex-direction: column; gap: 16px;
  font-size: .95rem;
}
.plain-list li { line-height: 1.7; }

/* ── Footer ── */
footer {
  text-align: center; padding: 36px 0;
  color: #b2bec3; font-size: .84rem;
  border-top: 1px solid #eee;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .hero { flex-direction: column; text-align: center; gap: 24px; padding: 48px 0 36px; }
  .contact-links { justify-content: center; }

  nav ul { gap: 16px; }
}