/* --- Variables --- */
:root {
  --bg: #f1f3f5;
  --text: #1c1c1c;
  --text-muted: #555;
  --accent: #1a365d;
  --accent-hover: #2c5282;
  --link: #2563eb;
  --link-hover: #1d4ed8;
  --border: #e2e0dc;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.08);
  --card-bg: #ffffff;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-serif: "Source Serif 4", Georgia, serif;
  --max-width: 920px;
  --section-gap: 4rem;
}

/* --- Reset & base --- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
main {
  padding: 0 1rem;
}

/* --- Sticky nav --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}
.nav-link {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}
.nav-link:hover { color: var(--link); }
.nav-sep {
  color: var(--text-muted);
  font-weight: 300;
  user-select: none;
}

/* --- Sections common --- */
.section {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto 2rem;
  padding: 2rem 1.5rem;
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--link);
  box-sizing: border-box;
}
.section-title {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
  color: var(--text);
}
.section-subline {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 1rem;
}
.section-subline a {
  color: var(--link);
  text-decoration: none;
}
.section-subline a:hover { text-decoration: underline; color: var(--link-hover); }

/* --- Hero --- */
.hero {
  width: 100%;
  max-width: var(--max-width);
  padding: 2rem 0 2.5rem;
  margin: 0 auto 2rem;
  box-sizing: border-box;
}
.hero-inner {
  position: relative;
  width: 100%;
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  padding: 2rem 1.5rem;
  border-left: 4px solid var(--link);
  box-sizing: border-box;
}
.hero-photo {
  object-fit: cover;
  box-shadow: var(--shadow);
}
/* Make the photo "embedded" in the text */
.hero-photo--float {
  float: right;
  width: 180px;
  height: 180px;
  margin: 0.2rem 0 0.9rem 1.25rem;
  border-radius: 999px;

  /* Optional: make text wrap around a circle (modern browsers) */
  shape-outside: circle(50%);
  shape-margin: 12px;
}
/* Clear the float so later sections don't get pulled up */
.hero-content::after {
  content: "";
  display: block;
  clear: both;
}
/* Mobile: stop wrapping; center the photo */
@media (max-width: 700px) {
  .hero-photo--float {
    float: none;
    display: block;
    margin: 0 auto 1rem auto;
    shape-outside: none;
  }
}
.hero-title {
  font-family: var(--font-sans);
  font-size: 2.25rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.hero-focus {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 500;
  margin: 0 0 0.75rem;
}
.hero-bio {
  margin: 0;
  color: var(--text);
}
.hero-bio a {
  color: var(--link);
  text-decoration: none;
}
.hero-bio a:hover { text-decoration: underline; color: var(--link-hover); }
.hero-bio + .hero-bio { margin-top: 0.75rem; }

/* Contact row at bottom of intro */
.hero-contact {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.hero-contact .row { display: flex; flex-wrap: wrap; }
.hero-contact .col {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1rem;
}
.hero-contact a {
  color: var(--link);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}
.hero-contact a:hover { text-decoration: underline; color: var(--link-hover); }
.hero-contact .pr-3 { padding-right: 1rem; }
.hero-contact .no-break { white-space: nowrap; }
.hero-contact i { margin-right: 0.35rem; }
.hero-updated {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

/* --- Research --- */
.research-section .section-header { margin-bottom: 1.5rem; }

.papers { display: flex; flex-direction: column; gap: 0; }
.paper-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.75rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.paper-row:last-of-type { border-bottom: none; }
.paper-row.older { display: none; }
.paper-row.older.visible { display: grid; }

.paper-thumb {
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  background: var(--border);
}
.paper-thumb img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.paper-content { min-width: 0; }
.paper-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  line-height: 1.4;
}
.paper-title a {
  color: var(--text);
  text-decoration: none;
}
.paper-title a:hover { color: var(--link); }
.paper-meta {
  font-size: 1rem;
  color: var(--text-muted);
  margin: 0 0 0.4rem;
}
.paper-meta .author-me {
  color: var(--link);
}
.paper-note {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
  margin: 0.2rem 0 0.4rem;
}
.paper-blurb {
  font-size: 1rem;
  margin: 0 0 0.5rem;
  color: var(--text);
  line-height: 1.55;
}
.paper-links {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  margin: 0;
}
.paper-links a {
  color: var(--link);
  text-decoration: none;
}
.paper-links a:hover { text-decoration: underline; color: var(--link-hover); }
.link-sep { color: var(--text-muted); margin: 0 0.25rem; }

.show-older-wrap {
  text-align: center;
  padding: 1.5rem 0 0;
}
.show-older-wrap.hidden { display: none; }
.btn-show-older {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
}
.btn-show-older:hover {
  color: var(--link);
  border-color: var(--link);
}

/* --- Experience --- */
.experience-section .section-title { margin-bottom: 1.5rem; }
.subsection-title {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--text);
}
.subsection-title:first-of-type { margin-top: 0; }

.experience-list { display: flex; flex-direction: column; gap: 1.25rem; }
.exp-entry {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 0;
}
.exp-logo {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}
.exp-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.exp-body {
  flex: 1;
  min-width: 0;
}
.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.exp-org {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}
.exp-dates {
  font-size: 0.9rem;
  color: var(--text-muted);
}
.exp-role {
  margin: 0.2rem 0 0;
  font-size: 0.95rem;
  color: var(--text);
}
.exp-extra {
  margin: 0.2rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.exp-summary {
  margin: 0.4rem 0 0;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.55;
}

/* --- Footer / Visitor map --- */
.footer {
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--card-bg);
  margin: 0 -1rem 0;
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.04);
}
.visitor-map-card {
  max-width: 360px;
  margin: 0 auto;
  padding: 1.25rem;
  background: #fff;
  border-radius: 10px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.visitor-caption {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}
.visitor-widget img { max-width: 100%; height: auto; border-radius: 4px; }
.visitor-placeholder-box {
  padding: 1.5rem 1rem;
  background: var(--bg);
  border-radius: 8px;
  border: 1px dashed var(--border);
  margin-top: 0.5rem;
}
.visitor-placeholder {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .paper-row {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1.5rem 0;
  }
  .paper-thumb {
    max-width: 220px;
    height: 140px;
  }
  .paper-thumb img { width: 100%; height: 100%; object-fit: cover; }
  .exp-header { flex-direction: column; align-items: flex-start; }
}