/* Base */
:root {
  --text: #2c2c2c;
  --text-light: #555;
  --accent: #8b5e3c;
  --bg: #fdfdfc;
  --bg-alt: #f5f3f0;
  --border: #e0dcd7;
  --nav-bg: #fff;
  --max-width: 820px;
  --font-body: 'Source Serif 4', Georgia, serif;
  --font-heading: 'Inter', -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { font-size: 17px; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  margin: 0;
  padding: 0;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* Nav */
nav {
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
  padding: 0.8rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

nav .site-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

nav .nav-links {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
}

nav .nav-links a {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  color: var(--text-light);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}

nav .nav-links a:hover,
nav .nav-links a.active {
  color: var(--accent);
}

/* Hamburger for mobile */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--text);
}

@media (max-width: 600px) {
  .nav-toggle { display: block; }
  nav .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.6rem;
    padding-top: 0.6rem;
  }
  nav .nav-links.open { display: flex; }
}

/* Main content */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* Headings */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
}

h1 { font-size: 1.6rem; margin-bottom: 0.3rem; }
h2 { font-size: 1.25rem; margin-top: 2.5rem; margin-bottom: 0.8rem; color: var(--text); }
h3 { font-size: 1.05rem; margin-top: 1.5rem; }

/* Links */
a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { text-decoration-thickness: 2px; }

/* Profile section on home */
.profile {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.profile img {
  width: 150px;
  height: auto;
  border-radius: 4px;
  flex-shrink: 0;
}

.profile-text p {
  margin: 0 0 0.6rem;
}

.profile-text .contact {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 0.8rem;
}

@media (max-width: 600px) {
  .profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .profile img { width: 130px; }
}

/* Research areas */
.research-areas {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
  margin-top: 1rem;
}

.research-area {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.2rem 1.4rem;
}

.research-area h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.research-area p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.6;
}

.research-area .papers {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-top: 0.6rem;
  font-style: italic;
}

/* Lists (awards, talks, service) */
.item-list {
  list-style: none;
  padding: 0;
}

.item-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.item-list li:last-child { border-bottom: none; }

.year-tag {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-right: 0.5rem;
}

/* Footer */
footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-light);
  text-align: center;
}

/* Utility */
.muted { color: var(--text-light); }
.small { font-size: 0.88rem; }

/* Books */
.books {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.book {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  flex: 1;
  min-width: 280px;
}

.book img {
  width: 90px;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 3px;
  flex-shrink: 0;
}

.book-info {
  font-size: 0.88rem;
}

.book-info .book-title {
  font-weight: 600;
  margin: 0 0 0.2rem;
}

.book-info .book-authors {
  margin: 0 0 0.2rem;
  color: var(--text-light);
}

.book-info .book-venue {
  margin: 0 0 0.2rem;
  font-style: italic;
  color: var(--text-light);
}

.book-info .book-links {
  margin: 0;
}

/* Publication page */
.pub-entry {
  margin-bottom: 1.3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.pub-entry:last-child { border-bottom: none; }
.pub-entry .pub-title { font-weight: 600; }
.pub-entry .pub-authors { font-size: 0.9rem; color: var(--text-light); }
.pub-entry .pub-venue { font-size: 0.88rem; font-style: italic; }
.pub-entry .pub-links { font-size: 0.85rem; margin-top: 0.3rem; }
.pub-entry .pub-award { 
  font-size: 0.85rem; 
  color: var(--accent); 
  font-weight: 600; 
}