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

:root {
  --navy:   #1a2c4e;
  --blue:   #2c5282;
  --accent: #3182ce;
  --light:  #f7f9fc;
  --text:   #2d3748;
  --muted:  #718096;
  --border: #e2e8f0;
  --white:  #ffffff;
  --max-w:  900px;
}

html { scroll-behavior: smooth; }

/* ── 3. Typography: Lora + Inter from Google Fonts ── */
body {
  font-family: 'Lora', Georgia, serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
  font-size: 16px;
}

h1, h2, h3 {
  font-family: 'Inter', Arial, sans-serif;
}

/* ── Navigation ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
}

nav .brand {
  color: var(--white);
  font-family: 'Inter', Arial, sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .03em;
  text-decoration: none;
}

nav ul {
  list-style: none;
  display: flex;
  gap: .4rem;
}

/* ── 9. Pill-style active nav highlight ── */
nav ul a {
  color: rgba(255,255,255,.8);
  text-decoration: none;
  font-family: 'Inter', Arial, sans-serif;
  font-size: .85rem;
  font-weight: 500;
  letter-spacing: .03em;
  padding: .3rem .85rem;
  border-radius: 999px;
  transition: background .2s, color .2s;
}

nav ul a:hover {
  color: var(--white);
  background: rgba(255,255,255,.12);
}

nav ul a.active {
  color: var(--white);
  background: var(--accent);
}

/* ── Nav social icons ── */
.nav-icons {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-icons a {
  color: rgba(255,255,255,.75);
  font-size: 1.05rem;
  text-decoration: none;
  transition: color .2s, transform .2s;
  display: flex;
  align-items: center;
}

.nav-icons a:hover {
  color: var(--white);
  transform: translateY(-2px);
}

/* ── Sections ── */
section {
  padding: 5rem 2rem;
}

section:nth-child(even) {
  background: var(--light);
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
}

/* ── Section headings ── */
.section-title {
  font-family: 'Inter', Arial, sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 2.5rem;
  padding-bottom: .6rem;
  border-bottom: 3px solid var(--accent);
  display: inline-block;
}

/* ── 2. Fade-in on scroll ── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .55s ease, transform .55s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── 1. HOME hero ── */
#home {
  background: linear-gradient(135deg, #1a2c4e 0%, #2c5282 55%, #2b6cb0 100%);
  padding: 6rem 2rem;
}

.home-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
}

.home-text h1 {
  font-size: 2.3rem;
  color: var(--white);
  margin-bottom: .3rem;
  font-weight: 700;
}

.home-text .title-line {
  font-family: 'Inter', Arial, sans-serif;
  color: rgba(255,255,255,.75);
  font-size: .95rem;
  margin-bottom: 1.6rem;
  font-weight: 400;
}

.home-text p {
  margin-bottom: 1rem;
  text-align: justify;
  color: rgba(255,255,255,.9);
}

.home-links {
  margin-top: 1.8rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: .5rem 1.25rem;
  border-radius: 6px;
  font-family: 'Inter', Arial, sans-serif;
  font-size: .85rem;
  font-weight: 600;
  text-decoration: none;
  transition: background .2s, color .2s, transform .15s;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--white);
  color: var(--navy);
}

.btn-primary:hover { background: #e8f0fe; }

.btn-outline {
  border: 2px solid rgba(255,255,255,.7);
  color: var(--white);
}

.btn-outline:hover {
  background: rgba(255,255,255,.15);
  border-color: var(--white);
}

.profile-photo {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 8px 28px rgba(0,0,0,.35);
  display: block;
  border: 3px solid rgba(255,255,255,.2);
}

/* ── RESEARCH ── */
.research-subsection {
  margin-bottom: 2.8rem;
}

.research-subsection h3 {
  font-family: 'Inter', Arial, sans-serif;
  font-size: .85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  margin-bottom: 1.2rem;
}

.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.pub-list li {
  padding: 1rem 1.25rem;
  background: var(--white);
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  box-shadow: 0 1px 5px rgba(0,0,0,.07);
  font-size: .95rem;
}

.pub-list li em {
  color: var(--blue);
  font-style: italic;
}

/* ── Publication links ── */
.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: .65rem;
}

.pub-links a {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-family: 'Inter', Arial, sans-serif;
  font-size: .75rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--accent);
  background: rgba(49,130,206,.08);
  border: 1px solid rgba(49,130,206,.3);
  border-radius: 4px;
  padding: .22rem .6rem;
  transition: background .2s, color .2s;
}

.pub-links a:hover {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

/* ── 7. Abstract toggle ── */
.abstract-toggle {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  font-family: 'Inter', Arial, sans-serif;
  font-size: .75rem;
  font-weight: 600;
  color: var(--muted);
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: .22rem .6rem;
  cursor: pointer;
  transition: color .2s, border-color .2s, background .2s;
  margin-top: .65rem;
}

.abstract-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(49,130,206,.06);
}

.abstract-toggle .toggle-icon {
  font-size: .65rem;
  transition: transform .25s;
}

.abstract-toggle[aria-expanded="true"] .toggle-icon {
  transform: rotate(180deg);
}

.abstract-body {
  display: none;
  margin-top: .75rem;
  padding: .75rem 1rem;
  background: var(--light);
  border-radius: 4px;
  font-size: .88rem;
  color: var(--text);
  line-height: 1.7;
  border-left: 3px solid var(--border);
}

.abstract-body.open {
  display: block;
  animation: slideDown .25s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── POLICY REPORTS ── */
.report-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  align-items: start;
  background: var(--white);
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,.08);
  padding: 1.75rem;
  margin-bottom: 2rem;
}

.report-img-link {
  display: block;
  flex-shrink: 0;
}

.report-img-link img {
  width: 100%;
  border-radius: 5px;
  border: 1px solid var(--border);
  transition: opacity .2s, box-shadow .2s, transform .2s;
}

.report-img-link:hover img {
  opacity: .88;
  box-shadow: 0 6px 18px rgba(0,0,0,.18);
  transform: translateY(-2px);
}

.report-title-link {
  color: var(--navy);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}

.report-title-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.report-card h3 {
  font-size: 1.05rem;
  color: var(--navy);
  margin-bottom: .5rem;
  line-height: 1.45;
}

.report-card .report-meta {
  font-family: 'Inter', Arial, sans-serif;
  font-size: .78rem;
  color: var(--muted);
  margin-bottom: .75rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.report-card p {
  font-size: .92rem;
  text-align: justify;
}

/* ── Footer ── */
footer {
  background: var(--navy);
  color: rgba(255,255,255,.55);
  text-align: center;
  padding: 1.5rem;
  font-family: 'Inter', Arial, sans-serif;
  font-size: .8rem;
}

footer a { color: rgba(255,255,255,.75); }

/* ── 8. Back-to-top button ── */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--white);
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 12px rgba(0,0,0,.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s, transform .3s, background .2s;
  z-index: 200;
}

#back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

#back-to-top:hover {
  background: var(--blue);
  transform: translateY(-3px);
}

/* ── Responsive ── */
@media (max-width: 680px) {
  .home-grid {
    grid-template-columns: 1fr;
  }
  .home-grid .profile-photo {
    max-width: 160px;
    order: -1;
    margin: 0 auto;
  }
  .report-card {
    grid-template-columns: 1fr;
  }
  nav ul { gap: .2rem; }
  nav ul a { font-size: .78rem; padding: .25rem .6rem; }
}