/* ============================================================
   Researcher Site – style.css
   Clean, minimal STEM academic aesthetic
   ============================================================ */

:root {
  --accent:    #094f6a;
  --accent-lt: #daeef5;
  --text:      #1c1c1e;
  --muted:     #6e6e73;
  --border:    #d1d1d6;
  --bg:        #ffffff;
  --bg-alt:    #f5f5f7;
  --nav-h:     64px;
  --max-w:     860px;
  --mono:      'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --sans:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

@font-face {
  font-family: 'BentonSansReg';
  src: url('fonts/BentonSansRegular.woff2') format('woff2');
  font-weight: normal;
  font-style: normal;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'BentonSansReg', Georgia, serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ── Nav ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}
.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  letter-spacing: -0.01em;
  text-decoration: none;
}
.nav-brand:hover { text-decoration: none; color: var(--accent); }
.nav-logo { height: 36px; width: auto; display: block; filter: brightness(0) saturate(100%) invert(19%) sepia(76%) saturate(768%) hue-rotate(168deg) brightness(95%); }
.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  align-items: center;
}
.nav-links > li { position: relative; }
.nav-links a {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 500;
  transition: color 0.15s;
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); text-decoration: none; }

/* ── Dropdown ── */
.nav-dropdown > a {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
}
.nav-dropdown > a::after {
  content: '';
  display: inline-block;
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-top: 1px;
  transition: transform 0.2s;
}
.nav-dropdown:hover > a::after,
.nav-dropdown.open > a::after { transform: rotate(180deg); }

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: white;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.10);
  list-style: none;
  min-width: 160px;
  padding: 0.4rem 0;
  padding-top: 0.75rem;
  margin-top: 8px;
  z-index: 200;
}
/* Invisible bridge fills the gap so hover doesn't break */
.nav-dropdown::after {
  content: '';
  position: absolute;
  top: 100%;
  left: -10px;
  right: -10px;
  height: 14px;
}
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown.open .dropdown-menu { display: block; }

.dropdown-menu li a {
  display: block;
  padding: 0.55rem 1.1rem;
  font-size: 0.88rem;
  color: var(--text);
  font-weight: 500;
  transition: background 0.12s, color 0.12s;
}
.dropdown-menu li a:hover {
  background: var(--accent-lt);
  color: var(--accent);
  text-decoration: none;
}

/* hamburger (mobile) */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.25rem; }
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text); margin: 5px 0;
  transition: transform 0.25s, opacity 0.25s;
}

/* ── Page sections ── */
section {
  padding: 5rem 2rem;
  max-width: var(--max-w);
  margin: 0 auto;
}
section:nth-child(even) { background: var(--bg); }

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
}
h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: var(--text);
}
h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

/* ── Hero / About ── */
#about {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 3rem;
  align-items: start;
  padding-top: 6rem;
}
.about-text p { color: var(--muted); margin-bottom: 1rem; max-width: 580px; }
.about-text p:last-child { margin-bottom: 0; }
.about-photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  background: var(--bg-alt);
  justify-self: end;
}
.about-photo-placeholder {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--accent-lt);
  border: 3px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  justify-self: end;
}

.tag-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.tag {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.25rem 0.7rem;
  border-radius: 99px;
  background: var(--accent-lt);
  color: var(--accent);
}

.social-links { display: flex; gap: 1rem; margin-top: 1.25rem; flex-wrap: wrap; }
.social-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: color 0.15s;
}
.social-links a:hover { color: var(--accent); text-decoration: none; }

/* ── Publications ── */
#publications { background: var(--bg-alt); max-width: 100%; padding: 5rem 0; }
#publications .inner { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }

.pub-filter {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.pub-filter button {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.9rem;
  border-radius: 99px;
  border: 1.5px solid var(--border);
  background: white;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s;
}
.pub-filter button.active,
.pub-filter button:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.pub-list { display: flex; flex-direction: column; gap: 1.25rem; min-height: 200px; }
.pub-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  transition: box-shadow 0.15s;
}
.pub-card:hover { box-shadow: 0 4px 18px rgba(0,0,0,0.07); }

.pub-year {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.2rem;
}
.pub-title { font-size: 1rem; font-weight: 600; margin-bottom: 0.25rem; }
.pub-authors { font-size: 0.85rem; color: var(--muted); margin-bottom: 0.5rem; }
.pub-venue {
  font-size: 0.82rem;
  font-style: italic;
  color: var(--muted);
  margin-bottom: 0.75rem;
}
.pub-links { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.pub-links a {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 5px;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  transition: all 0.15s;
}
.pub-links a:hover { background: var(--accent); color: white; text-decoration: none; }

/* ── Publication Paginator ── */
.pub-paginator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.75rem;
}
.pub-pag-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: white;
  cursor: pointer;
  color: var(--text);
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.pub-pag-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}
.pub-pag-btn:disabled { opacity: 0.3; cursor: default; }
.pub-pag-label {
  font-size: 0.85rem;
  color: var(--muted);
  min-width: 60px;
  text-align: center;
}

/* ── CV Show More ── */
.cv-extra-wrap {
  display: none;
  overflow: hidden;
}
.cv-extra-wrap.open { display: block; }
.cv-show-more {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.35rem 0.9rem;
  margin-top: 0.25rem;
  transition: all 0.15s;
}
.cv-show-more:hover { background: #063d52; }

/* ── CV ── */
#cv { padding: 5rem 2rem; }
.cv-download-box {
  background: var(--accent-lt);
  border: 1.5px solid var(--accent);
  border-radius: 12px;
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.cv-download-box p { color: var(--muted); font-size: 0.9rem; margin-top: 0.25rem; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  border: none;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: #063d52; color: white; text-decoration: none; }
.btn-outline { background: white; color: var(--accent); border: 1.5px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: white; text-decoration: none; }

.cv-section { margin-bottom: 2rem; }
.cv-section h3 { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 1rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4rem; }
.cv-item { display: flex; gap: 1.5rem; margin-bottom: 1.1rem; align-items: flex-start; }
.cv-item-year { font-size: 0.82rem; color: var(--muted); white-space: nowrap; min-width: 80px; padding-top: 0.15rem; font-variant-numeric: tabular-nums; }
.cv-item-body h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.1rem; }
.cv-item-body p { font-size: 0.85rem; color: var(--muted); }

/* ── Tools page ── */
.page-hero {
  padding: 5rem 2rem 3rem;
  max-width: var(--max-w);
  margin: 0 auto;
}
.page-hero p { color: var(--muted); max-width: 560px; margin-top: 0.5rem; text-align: justify; hyphens: auto; }

.tools-wrap { background: var(--bg-alt); padding: 3rem 2rem 5rem; }
.tools-wrap .inner { max-width: var(--max-w); margin: 0 auto; }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; }
.tool-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: box-shadow 0.15s;
}
.tool-card:hover { box-shadow: 0 4px 18px rgba(0,0,0,0.07); }
.tool-icon { font-size: 2rem; line-height: 1; }
.tool-card h3 { font-size: 1rem; }
.tool-card p { font-size: 0.85rem; color: var(--muted); flex: 1; }
.tool-card-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.25rem; }

/* ── News / Blog ── */
.news-wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem 5rem; }
.news-post {
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 0;
}
.news-post:first-child { padding-top: 0; }
.news-post:last-child { border-bottom: none; }
.news-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}
.news-date {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
}
.news-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.6rem;
  border-radius: 99px;
  background: var(--accent-lt);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.news-post h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text);
}
.news-post p { color: var(--muted); font-size: 0.95rem; margin-bottom: 0.75rem; }
.news-post p:last-of-type { margin-bottom: 1rem; }
.news-post a.read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}
.news-post a.read-more:hover { text-decoration: underline; }

/* ── Resources Table ── */
.resources-wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem 5rem; }
.resources-section { margin-bottom: 3rem; }
.resources-section-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
  margin-bottom: 0.5rem;
}
.resources-table {
  width: 100%;
  border-collapse: collapse;
}
.resources-table thead th {
  text-align: left;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 0.6rem 1rem;
  background: var(--bg-alt);
  border-bottom: 2px solid var(--border);
}
.resources-table thead th:first-child { border-radius: 8px 0 0 0; }
.resources-table thead th:last-child { border-radius: 0 8px 0 0; }
.resources-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.12s;
}
.resources-table tbody tr:last-child { border-bottom: none; }
.resources-table tbody tr:hover { background: var(--accent-lt); }
.resources-table td {
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  vertical-align: top;
}
.resources-table td:first-child {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  width: 220px;
}
.resources-table td:first-child a { color: var(--accent); }
.resources-table td:first-child a:hover { text-decoration: underline; }
.resources-table td:last-child { color: var(--muted); }

/* ── Contact ── */
#contact { padding: 5rem 2rem; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
.contact-info p { color: var(--muted); margin-bottom: 1.25rem; }
.contact-detail { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.75rem; font-size: 0.9rem; }
.contact-detail svg { flex-shrink: 0; color: var(--accent); }

.contact-form { display: flex; flex-direction: column; gap: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.35rem; }
.form-group label { font-size: 0.82rem; font-weight: 600; color: var(--muted); }
.form-group input,
.form-group textarea {
  padding: 0.6rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg-alt);
  resize: vertical;
  transition: border-color 0.15s;
}
.form-group input:focus,
.form-group textarea:focus { outline: none; border-color: var(--accent); background: white; }
.form-note { font-size: 0.78rem; color: var(--muted); }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

/* ── Utilities ── */
.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-width: 720px) {
  #about { grid-template-columns: 1fr; }
  .about-photo, .about-photo-placeholder { justify-self: start; order: -1; }
  .contact-grid { grid-template-columns: 1fr; }
  nav { padding: 0 1.25rem; }
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: 0;
  }
  .nav-links.open { display: flex; }
  .nav-links > li { padding: 0.5rem 0; border-bottom: 1px solid var(--bg-alt); }
  .nav-links > li:last-child { border-bottom: none; }
  .nav-toggle { display: flex; flex-direction: column; }
  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0 0 0 1rem;
    background: transparent;
  }
  .nav-dropdown:hover .dropdown-menu,
  .nav-dropdown.open .dropdown-menu { display: block; }
  .dropdown-menu li a { padding: 0.4rem 0; font-size: 0.85rem; color: var(--muted); }
  section { padding: 3.5rem 1.25rem; }
  h2 { font-size: 1.6rem; }
  .cv-download-box { flex-direction: column; align-items: flex-start; }
}