/* ============================================================
   REAA.TN — Main Stylesheet
   Fonts: DM Serif Display (headings) + DM Sans (body)
   Palette: Navy blue #0D2B4E · Accent blue #1E6FBF · Light #F5F7FA
   ============================================================ */

/* TOP BANNER */
.top-banner {
  background: var(--navy);
  color: var(--white);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  letter-spacing: 0.01em;
}

:root {
  --navy:    #0D2B4E;
  --blue:    #1E6FBF;
  --blue-lt: #EAF2FB;
  --accent:  #2E90D1;
  --white:   #FFFFFF;
  --off:     #F5F7FA;
  --muted:   #64748B;
  --border:  #D9E4EF;
  --text:    #1A2B3C;

  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans:  'DM Sans', system-ui, sans-serif;

  --max-w: 1120px;
  --r:     8px;
  --r-lg:  14px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: var(--font-sans); cursor: pointer; border: none; background: none; }

/* ── Container ── */
.container {
  width: min(var(--max-w), 100% - 2.5rem);
  margin-inline: auto;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.7rem 1.5rem;
  border-radius: var(--r);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: all 0.2s var(--ease);
  text-decoration: none;
}
.btn-primary {
  background: var(--blue);
  color: var(--white);
}
.btn-primary:hover { background: var(--navy); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--navy);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn-full { width: 100%; justify-content: center; }

/* ── Link arrow ── */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--blue);
  font-weight: 500;
  font-size: 0.9rem;
  transition: gap 0.2s var(--ease);
}
.link-arrow:hover { gap: 8px; }

/* ── Section shared ── */
.section { padding: 5rem 0; }
.section-alt { background: var(--off); }

.section-eyebrow {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.5rem;
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  color: var(--navy);
  line-height: 1.15;
  margin-bottom: 1rem;
}
.section-desc {
  color: var(--muted);
  max-width: 52ch;
}
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}
.section-header .section-desc { margin-inline: auto; }

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 2rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--navy);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}
.logo-mark {
  width: 34px;
  height: 34px;
  background: var(--navy);
  color: var(--white);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.1rem;
}
.logo-mark.small { width: 26px; height: 26px; font-size: 0.9rem; border-radius: 4px; }
.logo-text { font-weight: 500; letter-spacing: 0.06em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--muted);
  transition: color 0.15s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--blue);
  border-radius: 2px;
  transition: width 0.2s var(--ease);
}
.nav-links a:hover { color: var(--navy); }
.nav-links a:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all 0.2s;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  padding: 7rem 0 0;
  overflow: hidden;
  background: var(--white);
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.35;
  pointer-events: none;
}
.hero-grid-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255,255,255,0) 0%, rgba(255,255,255,0.95) 100%);
}
.hero-inner {
  position: relative;
  text-align: center;
  padding-bottom: 4rem;
}
.hero-badge {
  display: inline-block;
  background: var(--blue-lt);
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.9rem;
  border-radius: 100px;
  border: 1px solid #BDDDF5;
  margin-bottom: 1.5rem;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 6vw, 4rem);
  color: var(--navy);
  line-height: 1.1;
  margin-bottom: 1.25rem;
  max-width: 18ch;
  margin-inline: auto;
}
.hero-title em {
  font-style: italic;
  color: var(--blue);
}
.hero-sub {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 52ch;
  margin-inline: auto;
  margin-bottom: 2rem;
  font-weight: 300;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-stat-bar {
  background: var(--navy);
  padding: 1.5rem 0;
  margin-top: 0;
}
.stat-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 2.5rem;
}
.stat-num {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  color: var(--white);
  line-height: 1;
}
.stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #90AFC9;
  margin-top: 0.25rem;
}
.stat-divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,0.15);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}
.about-text p {
  color: var(--muted);
  margin-bottom: 1rem;
}
.about-text .link-arrow { margin-top: 0.5rem; }

.about-pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.pillar {
  background: var(--off);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.25rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.pillar:hover {
  border-color: #BDDDF5;
  box-shadow: 0 4px 16px rgba(30,111,191,0.08);
}
.pillar-icon {
  font-size: 1.1rem;
  color: var(--blue);
  margin-bottom: 0.5rem;
}
.pillar h3 {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--navy);
  margin-bottom: 0.35rem;
}
.pillar p {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ============================================================
   RESEARCH
   ============================================================ */
.research-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}
.research-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.75rem 1.5rem;
  transition: border-color 0.2s, transform 0.2s var(--ease), box-shadow 0.2s;
}
.research-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(30,111,191,0.1);
}
.research-card--featured {
  grid-column: span 2;
  border-color: var(--blue);
  background: var(--blue-lt);
}
.rc-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
  background: rgba(30,111,191,0.1);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  margin-bottom: 0.75rem;
}
.research-card--featured .rc-tag {
  background: rgba(30,111,191,0.15);
}
.research-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--navy);
  margin-bottom: 0.6rem;
  line-height: 1.25;
}
.research-card p {
  font-size: 0.87rem;
  color: var(--muted);
  line-height: 1.6;
}
.rc-topics {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.rc-topics li {
  font-size: 0.82rem;
  color: var(--blue);
  padding-left: 1rem;
  position: relative;
}
.rc-topics li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: #90AFC9;
}

/* ============================================================
   PARTNERS
   ============================================================ */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.partner-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.5rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.partner-card:hover {
  border-color: #BDDDF5;
  box-shadow: 0 4px 14px rgba(30,111,191,0.08);
}
.partner-logo-placeholder {
  width: 52px;
  height: 52px;
  background: var(--navy);
  color: var(--white);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}
.partner-name {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--navy);
}
.partner-type {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.partner-card--join {
  border-style: dashed;
  background: transparent;
  justify-content: center;
}
.partner-join-icon {
  width: 52px;
  height: 52px;
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--blue);
  margin-bottom: 0.25rem;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 5rem;
  align-items: start;
}
.contact-text p { color: var(--muted); margin-bottom: 1.5rem; }
.contact-details { display: flex; flex-direction: column; gap: 0.85rem; }
.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.contact-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.contact-item a { color: var(--blue); font-weight: 500; }
.contact-item a:hover { text-decoration: underline; }

/* Form */
.contact-form {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.form-group label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--navy);
}
.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text);
  background: var(--off);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 0.65rem 0.85rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  width: 100%;
  resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,111,191,0.12);
  background: var(--white);
}
.form-note {
  font-size: 0.82rem;
  color: var(--muted);
  min-height: 1.2rem;
  text-align: center;
}

/* ============================================================
   LEADERSHIP
   ============================================================ */
.section-leadership { background: var(--white); }
.leadership-grid {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}
.leader-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background: var(--off);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.5rem 2rem;
  min-width: 280px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.leader-card:hover {
  border-color: #BDDDF5;
  box-shadow: 0 4px 16px rgba(30,111,191,0.08);
}
.leader-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--navy);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.leader-name {
  font-weight: 500;
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 0.2rem;
}
.leader-role {
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--blue);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--navy);
  padding: 2.5rem 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
}
.footer-brand p {
  font-size: 0.78rem;
  color: #90AFC9;
  margin-left: 4px;
}
.footer-brand .logo-text { font-size: 0.95rem; }
.footer-nav {
  display: flex;
  gap: 1.75rem;
}
.footer-nav a {
  font-size: 0.82rem;
  color: #90AFC9;
  transition: color 0.15s;
}
.footer-nav a:hover { color: var(--white); }
.footer-copy {
  font-size: 0.75rem;
  color: #90AFC9;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.animate-up {
  animation: fadeUp 0.6s var(--ease) both;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .research-grid { grid-template-columns: 1fr 1fr; }
  .research-card--featured { grid-column: span 2; }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .stat { padding: 0.5rem 1.5rem; }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem 1.5rem;
    gap: 1.25rem;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .site-header { position: relative; }

  .hero { padding-top: 4rem; }
  .research-grid { grid-template-columns: 1fr; }
  .research-card--featured { grid-column: span 1; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .about-pillars { grid-template-columns: 1fr; }
  .stat-divider { display: none; }
  .stat-row { gap: 0.5rem; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-nav { flex-wrap: wrap; justify-content: center; }
}