:root{
  --maxw: 760px;
  --fg: #111;
  --muted: #555;
  --link: #0000EE;
  --border: #e6e6e6;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  padding: 2rem 1.25rem 12rem;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.4;
  font-size: 0.95rem;
  color: var(--fg);
  background: #fff;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-bottom: 6rem;
}

/* Header */
header {
  width: 100%;
  padding: 0rem 0rem; /* slightly smaller padding */
  box-sizing: border-box;
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.header-container {
  display: flex;
  justify-content: space-between; /* name left, nav right */
  align-items: center;
}

.header-container nav a {
  margin-left: 1rem; /* spacing between links */
  text-decoration: none;
  color: var(--link);
  font-weight: 500;
  font-size: 1rem; /* slightly smaller than before */
}

.header-container nav a:last-child {
  margin-right: 0;
}

.about-container {
  display: flex;
  align-items: flex-start; /* aligns image and text at top */
  gap: 2rem; /* space between image and text */
  margin-top: 1rem;
}

.portrait {
  width: 150px;   /* adjust as needed */
  height: 150px;  /* same as width for square */
  object-fit: cover;  /* keeps the image properly scaled */
  flex-shrink: 0;     /* prevents shrinking */
  border-radius: 0;   /* remove the circle effect */
}

.about-text {
  flex: 1; /* text takes the remaining space */
}

.name {
  font-size: clamp(2rem, 2.5vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 .25rem;
}

.tagline {
  margin: .15rem 0;
  color: var(--muted);
}

.links {
  margin: .75rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .75rem;
}

.links a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.links a:hover {
  border-color: currentColor;
}

@media (max-width:520px) {
  .head-grid {
    grid-template-columns: 1fr;
  }
}

/* Sections */
section {
  margin: 2.5rem 0;
}

h2 {
  font-size: 1.4rem;
  letter-spacing: .02em;
  font-weight: 700;
  margin: 0 0 1rem;
  padding-top: .5rem;
  border-top: 1px solid var(--border);
}

h3 {
  font-size: 1rem;      /* same as body text */
  font-weight: 600;      /* bold / semi-bold */
  margin: 1rem 0 0; /* optional spacing like before */
}

article.pub p {
  margin-top: 0; 
  margin-bottom: 0;  
}

.meta {
  color: var(--muted);
  font-size: .95rem;
}

.pub {
  margin-bottom: 1.5rem;
}

/* Links & lists */
a {
  color: var(--link);
}

a:hover {
  opacity: .9;
}

ul {
  padding-left: 1.2rem;
}

li + li {
  margin-top: .35rem;
}

/* Collapsible abstracts */
details {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
}

details > summary {
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  display: inline;
}

details > summary:hover {
  text-decoration: underline;  /* underline only when hovered */
}

/* Custom right arrow */
details > summary::before {
  content: "+";               /* right-pointing arrow */
  display: inline-block;
  font-size: 1em;           /* smaller arrow */
  transition: transform 0.2s; /* smooth rotation */
  margin-right: 0.2rem;       /* extra space from text */
}

/* Rotate arrow when open */
details[open] > summary::before {
  transform: rotate(90deg);   /* points down when open */
}

article.pub details[open] > *:not(summary) {
  display: block;          /* ensures block layout */
  padding-top: 0.5rem;     /* space above content */
  padding-bottom: 0.5rem;  /* space below content */
}

/* Collapsible content styling */
details p {
  line-height: 1.35;  /* adjust spacing inside collapsible abstracts */
  margin: 0.5rem 0;  /* optional spacing between paragraphs */
  font-size: 0.92rem; /* optional: slightly smaller text */
}

/* Mobile adjustments */
@media (max-width: 600px) {
  .about-container {
    flex-direction: column; /* stack image above text */
    align-items: center;    /* center horizontally */
    text-align: center;     /* center the text under the image */
    gap: 1rem;              /* smaller gap */
  }

  .about-text {
    flex: unset; /* let text take full width */
  }

  .portrait {
    width: 120px;   /* slightly smaller on mobile */
    height: 120px;
  }
  
  .header-container {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }

  .header-container nav a {
    margin-left: 0.5rem;
    margin-right: 0.5rem;
    font-size: 0.8rem;
  }
}