/* ── Variables ── */
:root {
  --accent:      #CFB87C;
  --accent-dark: #a8943e;
  --nav-bg:      #1b2a3b;
  --nav-text:    #ffffff;
  --odd:         #ffffff;
  --even:        #f7f7f7;
  --text:        rgba(0, 0, 0, 0.80);
  --muted:       rgba(0, 0, 0, 0.54);
  --heading:     #313131;
  --border:      #e4e4e4;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Base ── */
html { scroll-behavior: smooth; }
body {
  font-family: 'Open Sans', sans-serif;
  font-size: 18px;
  line-height: 1.65;
  color: var(--text);
  background: #fff;
  padding-top: 60px;
}
a { color: var(--accent-dark); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.72; }

/* ── Nav ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--nav-bg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  height: 60px;
}
.nav-inner {
  max-width: 1000px; margin: 0 auto;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1.5rem;
}
.brand {
  font-family: 'Lato', sans-serif;
  font-weight: 700; font-size: 1.1rem;
  color: #fff; opacity: 1 !important;
}
.brand:hover { opacity: 0.85 !important; }

nav ul { list-style: none; display: flex; }
nav ul a {
  font-family: 'Lato', sans-serif;
  font-size: 0.85rem; font-weight: 400;
  color: rgba(255, 255, 255, 0.85);
  padding: 0 0.85rem; line-height: 60px;
  display: block; transition: color 0.2s; opacity: 1;
}
nav ul a:hover,
nav ul a.active {
  color: var(--accent); font-weight: 700; opacity: 1;
}
.nav-toggle {
  display: none;
  background: none; border: none;
  color: #fff; font-size: 1.4rem;
  cursor: pointer; padding: 0.3rem 0.5rem; line-height: 1;
}

/* ── Container ── */
.container { max-width: 960px; margin: 0 auto; padding: 0 1.5rem; }

/* ── Sections ── */
section { padding: 5rem 0; }
section:nth-child(odd)  { background: var(--odd); }
section:nth-child(even) { background: var(--even); }

/* ── Section Headings ── */
.section-heading { text-align: center; margin-bottom: 3rem; }
.section-heading h2 {
  font-family: 'Lato', sans-serif;
  font-size: 1.55rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 4px;
  color: var(--heading);
  display: inline-block; position: relative;
}
.section-heading h2::before,
.section-heading h2::after {
  content: '';
  position: absolute;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  top: 50%; transform: translateY(-50%);
}
.section-heading h2::before { left: -18px; }
.section-heading h2::after  { right: -18px; }

/* ── About ── */
.about-grid {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 3.5rem; align-items: start;
}
.avatar {
  width: 210px; height: 210px; object-fit: cover;
  border-radius: 50%;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.14);
  display: block;
}
.about-name {
  font-family: 'Lato', sans-serif;
  font-size: 2.1rem; font-weight: 700;
  color: var(--heading); margin-bottom: 0.2rem;
}
.about-title {
  font-family: 'Lato', sans-serif;
  font-size: 1rem; font-weight: 600;
  color: var(--accent-dark); margin-bottom: 1rem;
}
.about-bio { font-size: 0.95rem; margin-bottom: 1.5rem; }
.about-bio a { color: var(--accent-dark); border-bottom: 1px solid var(--accent); opacity: 1; }
.about-bio a:hover { opacity: 0.72; }

/* Education in About */
.about-edu { margin-bottom: 1.5rem; }
.edu-item {
  display: flex; flex-direction: column;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.edu-item:last-child { border-bottom: none; }
.edu-degree { font-weight: 600; color: var(--heading); }
.edu-minor  { font-weight: 400; color: var(--muted); font-size: 0.85em; }
.edu-place  { color: var(--muted); }

.social-links { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.social-links a {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  border: 1.5px solid var(--accent);
  border-radius: 4px;
  font-family: 'Lato', sans-serif;
  font-size: 0.8rem; font-weight: 700;
  color: var(--accent-dark); opacity: 1;
  transition: background 0.2s, color 0.2s;
}
.social-links a:hover { background: var(--accent); color: #fff; opacity: 1; }

/* ── Research ── */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}
.research-card {
  background: #fff;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 4px;
  padding: 1.75rem 1.5rem;
}
.research-icon { font-size: 1.8rem; margin-bottom: 0.7rem; }
.research-card h3 {
  font-family: 'Lato', sans-serif;
  font-size: 1rem; font-weight: 700;
  color: var(--heading); margin-bottom: 0.6rem;
}
.research-card p { font-size: 0.88rem; }

/* ── Publications ── */
.pub-group-label {
  font-family: 'Lato', sans-serif;
  font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 2px;
  color: var(--accent-dark);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.3rem; margin: 2.5rem 0 1rem;
}
.pub-list {
  list-style: none;
  counter-reset: pub-counter;
}
.pub-item {
  position: relative;
  padding: 0.9rem 0 0.9rem 2.4rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  counter-increment: pub-counter;
}
.pub-item::before {
  content: counter(pub-counter) ".";
  position: absolute; left: 0; top: 0.9rem;
  font-family: 'Lato', sans-serif;
  font-weight: 700; color: var(--accent-dark);
  min-width: 1.8rem;
}
.pub-title  { font-weight: 600; color: var(--heading); margin-bottom: 0.2rem; }
.pub-authors { color: var(--muted); font-size: 0.85rem; margin-bottom: 0.15rem; }
.pub-journal { font-size: 0.85rem; color: var(--muted); }
a.pub-doi {
  font-size: 0.78rem; font-weight: 700;
  color: var(--accent-dark); opacity: 1;
  border-bottom: 1px solid var(--accent);
  margin-left: 0.4rem;
}
a.pub-doi:hover { opacity: 0.7; }

/* ── Talks ── */
.talk-note {
  font-weight: 400; text-transform: none;
  letter-spacing: 0; color: var(--muted);
  font-size: 0.78rem;
}
.talk-list {
  list-style: none;
  counter-reset: talk-counter;
}
.talk-item {
  position: relative;
  padding: 0.75rem 0 0.75rem 2.4rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  counter-increment: talk-counter;
}
.talk-item::before {
  content: counter(talk-counter) ".";
  position: absolute; left: 0; top: 0.75rem;
  font-family: 'Lato', sans-serif;
  font-weight: 700; color: var(--accent-dark);
  min-width: 1.8rem;
}
.talk-group-spacer { margin-top: 2.5rem; }
.talk-title { font-weight: 600; color: var(--heading); margin-bottom: 0.2rem; }
.talk-meta  { font-size: 0.83rem; color: var(--muted); }

/* ── Teaching ── */
.teaching-item {
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--border);
}
.teaching-header {
  display: flex; justify-content: space-between;
  align-items: flex-start; margin-bottom: 0.5rem;
  flex-wrap: wrap; gap: 0.5rem;
}
.teaching-course {
  font-family: 'Lato', sans-serif;
  font-weight: 700; font-size: 1rem; color: var(--heading);
}
.teaching-role  { font-size: 0.88rem; color: var(--muted); }
.teaching-meta  { text-align: right; }
.teaching-place { font-size: 0.88rem; font-style: italic; color: var(--accent-dark); }
.teaching-date  { font-size: 0.82rem; color: var(--muted); }
.teaching-bullets {
  list-style: disc; padding-left: 1.4rem;
  font-size: 0.88rem;
}
.teaching-bullets li { margin-bottom: 0.15rem; }

/* ── Awards ── */
.award-row {
  display: flex; align-items: baseline; gap: 1rem;
  padding: 0.7rem 0; border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.award-year {
  font-family: 'Lato', sans-serif;
  font-weight: 700; color: var(--accent-dark);
  min-width: 3rem; flex-shrink: 0;
}
.award-name  { flex: 1; color: var(--heading); }
.award-place { color: var(--muted); font-size: 0.82rem; text-align: right; flex-shrink: 0; }

/* ── Footer ── */
footer {
  background: var(--nav-bg);
  color: rgba(255, 255, 255, 0.55);
  text-align: center; padding: 1.75rem 0;
  font-size: 0.82rem;
}
footer a { color: var(--accent); opacity: 1; }
footer a:hover { opacity: 0.8; }

/* ── Responsive ── */
@media (max-width: 720px) {
  body { font-size: 16px; }

  .nav-toggle { display: block; }
  nav ul {
    display: none; flex-direction: column;
    position: absolute; top: 60px; left: 0; right: 0;
    background: var(--nav-bg);
    padding: 0.5rem 0 1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
  }
  nav ul.open { display: flex; }
  nav ul a { line-height: 2.6; padding: 0 1.5rem; }

  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .about-photo { display: flex; justify-content: center; }
  .avatar { width: 160px; height: 160px; }
  .about-name { font-size: 1.7rem; }

  .research-grid { grid-template-columns: 1fr; gap: 1.25rem; }

  .teaching-header { flex-direction: column; }
  .teaching-meta   { text-align: left; }

  .award-row   { flex-wrap: wrap; }
  .award-place { text-align: left; }
}

@media (max-width: 480px) {
  section { padding: 3.5rem 0; }
  .pub-item  { padding-left: 1.8rem; }
  .talk-item { padding-left: 1.8rem; }
}