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

:root {
  --bg:      #ffffff;
  --bg2:     #f8f8f8;
  --text:    #212121;
  --muted:   #666666;
  --accent:  #1a1a1a;
  --link:    #1558b0;
  --divider: #e0e0e0;
  --nav-bg:  #ffffff;
  --nav-border: #e0e0e0;
  --max:     800px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Open Sans', sans-serif;
  font-weight: 400;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
}

/* ── Nav ──────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  z-index: 200;
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  height: 56px;
}

.nav-logo {
  font-family: 'Playfair Display', serif;
  font-size: 1.3rem;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
  margin-right: auto;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
}

.nav-links li > a {
  display: block;
  padding: 0 1rem;
  height: 56px;
  line-height: 56px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.875rem;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.nav-links li > a:hover {
  background: #f0f0f0;
  color: var(--accent);
}

/* Dropdown */
.dropdown { position: relative; }

.dropdown-toggle { cursor: pointer; }

.dropdown-menu {
  display: none;
  position: absolute;
  top: 56px;
  right: 0;
  background: #fff;
  border: 1px solid var(--divider);
  min-width: 200px;
  list-style: none;
  z-index: 300;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

.dropdown.active .dropdown-menu { display: block; }

.dropdown-menu li a {
  display: block;
  padding: 0.6rem 1.2rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.875rem;
  transition: background 0.15s;
}

.dropdown-menu li a:hover { background: #f5f5f5; }

/* Hamburger (mobile) */
.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

/* ── Intro ────────────────────────────────────────── */
.intro {
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  border-bottom: 1px solid var(--divider);
}

.intro-inner {
  max-width: 640px;
  margin: 0 auto;
}

.intro-text {
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 2.5rem;
  line-height: 1.9;
}

.headshot-wrap {
  display: flex;
  justify-content: center;
}

.headshot {
  width: 100%;
  max-width: 480px;
  height: auto;
  display: block;
  border-radius: 4px;
}

/* ── Sections ─────────────────────────────────────── */
.section {
  padding: 3rem 1.5rem;
  border-bottom: 1px solid var(--divider);
}

.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}

h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

/* ── Intro contact ────────────────────────────────── */
.intro-contact {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: -1.8rem;
  margin-bottom: 2rem;
}

/* ── Education ────────────────────────────────────── */
.edu-entry {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.4rem;
  gap: 1rem;
}

.edu-left { flex: 1; }

.edu-right {
  text-align: right;
  white-space: nowrap;
  flex-shrink: 0;
}

.edu-entry--small .edu-school { font-size: 0.85rem; }
.edu-entry--small .edu-degree { font-size: 0.78rem; }
.edu-entry--small .edu-loc    { font-size: 0.78rem; }
.edu-entry--small .edu-dates  { font-size: 0.75rem; }

.edu-school {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.95rem;
}

.edu-degree {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text);
  margin-top: 0.1rem;
}

.edu-detail {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

.edu-loc {
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

.edu-dates {
  font-size: 0.82rem;
  color: var(--muted);
  font-style: italic;
}

/* ── Professional Experience ──────────────────────── */
.exp-entry {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.exp-dates {
  color: var(--muted);
  white-space: nowrap;
  min-width: 4.5rem;
  flex-shrink: 0;
}

.exp-desc { color: var(--text); }

/* ── Publications ─────────────────────────────────── */
.pub-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.8rem;
  margin-top: 1.4rem;
}

.pub-label:first-child { margin-top: 0; }

.paper {
  margin-bottom: 1rem;
}

.paper-citation {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.75;
}

.paper-citation a {
  color: var(--link);
  text-decoration: none;
}

.paper-citation a:hover { text-decoration: underline; }

.paper-meta {
  color: var(--muted);
  font-size: 0.88rem;
}

.paper-abstract {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.8;
  margin-top: 0.5rem;
  padding-left: 0;
}

/* ── Teaching table ───────────────────────────────── */
.teaching-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.teaching-table tr { border-bottom: 1px solid var(--divider); }
.teaching-table tr:last-child { border-bottom: none; }

.teaching-table td {
  padding: 0.45rem 0;
  color: var(--text);
  vertical-align: top;
}

.teach-term {
  color: var(--muted);
  white-space: nowrap;
  padding-right: 1.5rem;
  min-width: 6rem;
}

/* ── Presentations ────────────────────────────────── */
.pres-list {
  padding-left: 1.2rem;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.8;
}

.pres-list li { margin-bottom: 0.5rem; }

/* ── Skills / Languages ───────────────────────────── */
.skills-list {
  font-size: 0.95rem;
  color: var(--text);
}

/* ── Entries ──────────────────────────────────────── */
.entry { margin-bottom: 1.5rem; }

.entry-org {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent);
}

.entry-dates {
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--muted);
  margin-left: 0.5rem;
}

.entry-role {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0.15rem 0 0.4rem;
}

.entry-detail {
  font-size: 0.9rem;
  color: var(--text);
  margin-top: 0.25rem;
}

.entry-bullets {
  margin-top: 0.4rem;
  padding-left: 1.3rem;
  font-size: 0.9rem;
  color: var(--text);
}

.entry-bullets li { margin-bottom: 0.3rem; }

.entry-subbullets {
  margin-top: 0.3rem;
  padding-left: 1.3rem;
  list-style-type: circle;
}

.entry-subbullets li { margin-bottom: 0.2rem; }

/* ── Publications ─────────────────────────────────── */
.pub-list {
  padding-left: 1.3rem;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.9;
}

.pub-list li { margin-bottom: 0.7rem; }

.pub-list a {
  color: var(--link);
  text-decoration: none;
}

.pub-list a:hover { text-decoration: underline; }

/* ── Mobile ───────────────────────────────────────── */
@media (max-width: 640px) {
  .hamburger { display: block; }

  .nav-links {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--divider);
    padding: 0.5rem 0;
  }

  .nav-links.open { display: flex; }

  .nav-links li > a {
    height: auto;
    line-height: 1.5;
    padding: 0.75rem 1.5rem;
    width: 100%;
  }

  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    background: #f5f5f5;
    min-width: unset;
    width: 100%;
  }

  .two-col { grid-template-columns: 1fr; }

  .headshot { max-width: 320px; }
}