/* ==========================================================================
   Fondation Jean Mengo — feuille de style
   Direction artistique inspirée de nelsonmandela.org :
   fond clair (crème/ivoire), photographie d'archive en noir & blanc/sépia,
   typographie éditoriale (serif pour les titres/citations, sans-serif pour
   le reste), texte bleu marine, accent terracotta + or, grande respiration.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,500;0,600;0,700;1,500&family=Work+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --bg: #f6f1e6;
  --bg-alt: #eef2f4;
  --bg-card: #fffdf8;
  --ink: #1f3247;
  --ink-muted: #4b5f74;
  --ink-faint: #8a93a0;
  --terracotta: #a97350;
  --terracotta-dark: #8f5d3f;
  --gold: #c8a24d;
  --gold-light: #b9862f;
  --border: rgba(31,50,71,0.12);
  --border-strong: rgba(31,50,71,0.22);
  --serif: 'Playfair Display', Georgia, serif;
  --sans: 'Work Sans', -apple-system, Segoe UI, Roboto, sans-serif;
  --container: 1180px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 .5em;
  letter-spacing: .01em;
  color: var(--ink);
}
p{ margin:0 0 1em; color: var(--ink-muted); }
.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}
.eyebrow{
  font-family: var(--sans);
  text-transform: uppercase;
  letter-spacing: .22em;
  font-size: 12px;
  color: var(--gold-light);
  font-weight: 700;
  display:flex;
  align-items:center;
  gap:12px;
}
.eyebrow::before{
  content:"";
  width:28px; height:1px;
  background: var(--gold-light);
  display:inline-block;
}
.section{ padding: 96px 0; }
.section-tight{ padding: 64px 0; }
.section-alt{ background: var(--bg-alt); }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding: 14px 30px;
  border-radius: 999px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .03em;
  border: 1px solid var(--border-strong);
  cursor: pointer;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn-primary{
  background: var(--terracotta);
  color: #fdf9f2;
  border-color: transparent;
}
.btn-primary:hover{ background: var(--terracotta-dark); transform: translateY(-1px); }
.btn-ghost{
  background: transparent;
  color: var(--ink);
  border-color: var(--border-strong);
}
.btn-ghost:hover{ border-color: var(--ink); background: rgba(31,50,71,0.05); }
.btn-donate{
  background: var(--terracotta);
  color: #fdf9f2;
  border-color: transparent;
}
.btn-donate:hover{ background: var(--terracotta-dark); }

/* ---------- Header / Nav ---------- */
.site-header{
  position: sticky; top:0; z-index: 100;
  background: rgba(246,241,230,0.92);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid var(--border);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: 18px 0;
}
.brand{
  display:flex; align-items:center; gap:12px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}
.brand .mark{
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1.5px solid var(--gold-light);
  display:flex; align-items:center; justify-content:center;
  font-family: var(--serif);
  font-size: 16px;
  color: var(--gold-light);
  background: var(--bg-card);
}
.brand small{
  display:block;
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold-light);
  font-style: italic;
  font-weight: 500;
  margin-top: 2px;
}
.nav-links{
  display:flex; align-items:center; gap:36px;
  list-style:none; margin:0; padding:0;
}
.nav-links a{
  font-size: 14px; font-weight: 500;
  color: var(--ink-muted);
  position: relative;
  padding-bottom: 4px;
  transition: color .2s ease;
}
.nav-links a:hover, .nav-links a.active{ color: var(--ink); }
.nav-links a.active::after{
  content:"";
  position:absolute; left:0; right:0; bottom:0;
  height:2px; background: var(--terracotta);
}
.nav-actions{ display:flex; align-items:center; gap:14px; }
.nav-toggle{
  display:none;
  background:none; border:none; color:var(--ink);
  font-size: 24px; cursor:pointer;
}

@media (max-width: 900px){
  .nav-links{
    position:absolute; top:100%; left:0; right:0;
    flex-direction:column; align-items:flex-start; gap:0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    max-height:0; overflow:hidden;
    transition: max-height .3s ease;
  }
  .nav-links.open{ max-height: 400px; }
  .nav-links li{ width:100%; }
  .nav-links a{ display:block; padding: 16px 32px; width:100%; border-bottom:1px solid var(--border); }
  .nav-toggle{ display:block; }
  .nav-actions .btn-ghost{ display:none; }

  .nav{ flex-wrap: nowrap; }
  .brand{ flex: 1 1 auto; min-width: 0; font-size: 17px; gap: 10px; }
  .brand small{ display: none; }
  .brand .mark{ width: 32px; height: 32px; font-size: 14px; flex-shrink: 0; }
  .nav-actions{ gap: 8px; flex-shrink: 0; }
  .nav-actions .btn-donate{ padding: 10px 16px; font-size: 12.5px; }
}

/* ---------- Hero ---------- */
.hero{
  position: relative;
  padding: 90px 0 110px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 82% 18%, rgba(200,162,77,0.16), transparent 55%),
    var(--bg);
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 64px;
  align-items:center;
}
.hero-eyebrow{ margin-bottom: 22px; }
.hero h1{
  font-size: clamp(44px, 6vw, 78px);
  color: var(--ink);
  margin-bottom: 18px;
}
.hero h1 em{
  font-style: italic;
  color: var(--gold-light);
}
.hero .dates{
  font-family: var(--serif);
  font-style: italic;
  font-size: 22px;
  color: var(--ink-muted);
  margin-bottom: 26px;
}
.hero p.lead{
  font-size: 17px;
  max-width: 46ch;
  color: var(--ink-muted);
  margin-bottom: 34px;
}
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; }
.hero-portrait{
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  aspect-ratio: 4/5;
  background: var(--bg-card);
}
.hero-portrait::before{
  content:"";
  position:absolute; z-index:0;
  right:-90px; top:-90px;
  width: 340px; height:340px;
  border-radius: 50%;
  background:
    repeating-radial-gradient(circle, var(--gold) 0 2px, transparent 2px 16px);
  opacity: .35;
}
.hero-portrait img{
  position:relative; z-index:1;
  width:100%; height:100%; object-fit: cover;
  filter: grayscale(100%) sepia(12%) contrast(1.05);
}
.hero-portrait::after{
  content:"";
  position:absolute; inset:0; z-index:1;
  background: linear-gradient(to top, rgba(20,26,32,0.55), transparent 42%);
}
.hero-portrait .caption{
  position:absolute; left:22px; right:22px; bottom:20px;
  z-index:2;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #f4efe4;
}
@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
  .hero-portrait{ order:-1; max-width: 380px; margin: 0 auto; }
}

/* ---------- Facts strip ---------- */
.facts{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.fact{
  padding: 32px 28px;
  border-left: 1px solid var(--border);
}
.fact:first-child{ border-left:none; }
.fact .num{
  font-family: var(--serif);
  font-size: 30px;
  color: var(--gold-light);
  display:block;
  margin-bottom: 6px;
}
.fact .label{
  font-size: 13px;
  color: var(--ink-muted);
  line-height:1.4;
}
@media (max-width: 900px){
  .facts{ grid-template-columns: 1fr 1fr; }
  .fact{ border-left:none; border-top:1px solid var(--border); }
  .fact:nth-child(2){ border-left:1px solid var(--border); }
  .fact:nth-child(4){ border-left:1px solid var(--border); }
}

/* ---------- Section headers ---------- */
.section-head{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap: 24px; margin-bottom: 48px; flex-wrap:wrap;
}
.section-head h2{ font-size: clamp(30px, 4vw, 42px); margin:14px 0 0; color: var(--ink); }
.section-head p{ max-width: 52ch; margin:14px 0 0; }

/* ---------- Cards (teasers) ---------- */
.card-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.card{
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow:hidden;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  display:flex; flex-direction:column;
  box-shadow: 0 1px 3px rgba(31,50,71,0.05);
}
.card:hover{ transform: translateY(-6px); border-color: var(--border-strong); box-shadow: 0 18px 34px rgba(31,50,71,0.12); }
.card .thumb{
  aspect-ratio: 4/3;
  overflow:hidden;
  background: #e7e0d0;
}
.card .thumb img{
  width:100%; height:100%; object-fit:cover;
  filter: grayscale(100%) sepia(8%);
  transition: filter .5s ease, transform .5s ease;
}
.card:hover .thumb img{ filter: grayscale(10%) sepia(6%); transform: scale(1.04); }
.card .body{ padding: 24px; flex:1; display:flex; flex-direction:column; }
.card .tag{
  font-size: 11px; letter-spacing:.14em; text-transform:uppercase;
  color: var(--gold-light); font-weight:700; margin-bottom:10px;
}
.card h3{ font-size: 21px; margin-bottom: 10px; color: var(--ink); }
.card p{ font-size: 14px; flex:1; }
.card .go{ font-size:13px; font-weight:600; color: var(--terracotta); margin-top:14px; }
@media (max-width: 900px){ .card-grid{ grid-template-columns: 1fr; } }

/* ---------- Quote ---------- */
.quote-block{
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
  padding: 90px 0;
  text-align:center;
  background: var(--bg-alt);
}
.quote-block blockquote{
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(24px, 3.4vw, 38px);
  color: var(--ink);
  max-width: 900px;
  margin: 0 auto 22px;
  line-height:1.4;
}
.quote-block cite{
  font-style: normal;
  font-size: 13px;
  letter-spacing:.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ---------- Timeline (biographie) ---------- */
.timeline{
  position:relative;
  margin-top: 40px;
  padding-left: 34px;
  border-left: 1px solid var(--border-strong);
}
.tl-item{
  position: relative;
  padding-bottom: 48px;
}
.tl-item:last-child{ padding-bottom:0; }
.tl-item::before{
  content:"";
  position:absolute; left:-40px; top:4px;
  width:11px; height:11px; border-radius:50%;
  background: var(--gold-light);
  box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--border-strong);
}
.tl-year{
  font-family: var(--serif);
  font-style:italic;
  color: var(--gold-light);
  font-size: 20px;
  margin-bottom: 6px;
}
.tl-item h3{ font-size: 19px; color: var(--ink); margin-bottom:6px; }
.tl-item p{ margin:0; max-width: 62ch; }

/* ---------- Library filters & docs ---------- */
.filters{
  display:flex; gap:12px; flex-wrap:wrap; margin-bottom: 42px;
}
.filter-btn{
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--ink-muted);
  font-family: var(--sans);
  font-size: 13px; font-weight:600;
  cursor:pointer;
  transition: all .2s ease;
}
.filter-btn:hover{ color: var(--ink); border-color: var(--gold-light); }
.filter-btn.active{ background: var(--terracotta); color:#fdf9f2; border-color: var(--terracotta); }

.doc-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
@media (max-width: 900px){ .doc-grid{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px){ .doc-grid{ grid-template-columns: 1fr; } }

.doc-card{
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow:hidden;
  cursor: pointer;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  box-shadow: 0 1px 3px rgba(31,50,71,0.05);
}
.doc-card:hover{ transform: translateY(-4px); border-color: var(--border-strong); box-shadow: 0 16px 30px rgba(31,50,71,0.12); }
.doc-card .thumb{
  aspect-ratio: 3/4;
  background:#e7e0d0;
  overflow:hidden;
  position:relative;
}
.doc-card .thumb img{
  width:100%; height:100%; object-fit:cover;
  filter: grayscale(85%) sepia(10%) contrast(1.02);
  transition: filter .4s ease;
}
.doc-card:hover .thumb img{ filter: grayscale(20%) sepia(6%); }
.doc-card .thumb .zoom{
  position:absolute; right:12px; top:12px;
  width:34px; height:34px; border-radius:50%;
  background: rgba(246,241,230,0.85);
  border: 1px solid var(--border-strong);
  display:flex; align-items:center; justify-content:center;
  font-size:15px; color: var(--ink);
}
.doc-card .info{ padding: 18px 20px; }
.doc-card .doc-tag{
  font-size:10.5px; letter-spacing:.12em; text-transform:uppercase;
  color: var(--gold-light); font-weight:700; margin-bottom:8px; display:block;
}
.doc-card h4{ font-family: var(--serif); font-size:17px; margin:0 0 6px; color: var(--ink); }
.doc-card .meta{ font-size:12.5px; color: var(--ink-faint); margin:0; }

/* ---------- Lightbox ---------- */
.lightbox{
  position: fixed; inset:0; z-index: 200;
  background: rgba(15,18,22,0.92);
  display:none;
  align-items:center; justify-content:center;
  padding: 40px;
}
.lightbox.open{ display:flex; }
.lightbox-inner{
  max-width: 900px; width:100%;
  max-height: 88vh;
  display:flex; flex-direction:column; align-items:center;
  gap: 18px;
}
.lightbox img{
  max-height: 74vh; width:auto; margin:0 auto;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
}
.lightbox .lb-caption{ text-align:center; color: #e7e0d0; font-size:14px; }
.lightbox .lb-close{
  position:absolute; top:28px; right:32px;
  width:44px; height:44px; border-radius:50%;
  border:1px solid rgba(255,255,255,0.25);
  background: rgba(255,255,255,0.08);
  color: #fdf9f2; font-size:20px; cursor:pointer;
}

/* ---------- Auth strip (placeholder, section 5.1 du cahier des charges) ---------- */
.auth-panel{
  max-width: 460px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 10px 30px rgba(31,50,71,0.08);
}
.field{
  display:flex; flex-direction:column; gap:6px; margin-bottom:18px;
}
.field label{ font-size:12px; text-transform:uppercase; letter-spacing:.1em; color: var(--ink-faint); }
.field input, .field select{
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 13px 18px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
}
.field input:focus, .field select:focus{ outline:none; border-color: var(--gold-light); }

/* ---------- Footer (section sombre, uniforme sur toutes les pages) ---------- */
.site-footer{
  border-top: 3px solid var(--gold);
  padding: 72px 0 0;
  background: #16222e;
  color: #d8d2c4;
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 20px;
}
.footer-grid h5{
  font-family: var(--sans);
  font-size: 12px; letter-spacing:.14em; text-transform:uppercase;
  color: var(--gold);
  font-weight: 700;
  margin-bottom: 20px;
}
.footer-grid ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:12px; }
.footer-grid a{ font-size: 14px; color: #c3bdae; transition: color .2s ease; }
.footer-grid a:hover{ color: var(--gold-light); }

.footer-contact{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:14px; }
.footer-contact li{ display:flex; align-items:flex-start; gap:10px; font-size:14px; color:#c3bdae; }
.footer-contact .ficon{
  flex-shrink:0;
  display:inline-flex;
  color: var(--gold-light);
  margin-top: 2px;
}
.footer-contact .ficon svg{ width:15px; height:15px; }
.footer-contact a{ color:#c3bdae; }
.footer-contact a:hover{ color: var(--gold-light); }

.social-row{ display:flex; gap:12px; margin-top:2px; }
.social-icon{
  width:38px; height:38px; border-radius:50%;
  border:1px solid rgba(216,210,196,0.28);
  display:flex; align-items:center; justify-content:center;
  color:#d8d2c4;
  transition: all .2s ease;
  cursor: default;
  opacity: .55;
}
.social-icon svg{ width:16px; height:16px; }
.social-note{ font-size:11.5px; color: rgba(216,210,196,0.5); margin-top:14px; line-height:1.5; }

.footer-brand-row{
  padding: 34px 0;
  border-top: 1px solid rgba(216,210,196,0.14);
  display:flex; align-items:center;
}
.footer-brand{ display:flex; align-items:center; gap:14px; }
.footer-brand .mark{
  width:44px; height:44px; border-radius:50%;
  border: 1.5px solid var(--gold);
  display:flex; align-items:center; justify-content:center;
  font-family: var(--serif); font-size:16px; color: var(--gold-light);
  background: rgba(216,210,196,0.05);
}
.footer-brand strong{ display:block; font-family: var(--serif); font-size:16px; color:#f4efe4; }
.footer-brand em{ font-style: italic; font-size:12px; color: rgba(216,210,196,0.6); }

.footer-bottom{
  border-top: 1px solid rgba(216,210,196,0.14);
  padding: 24px 0 28px;
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px;
  font-size: 12.5px; color: rgba(216,210,196,0.55);
}
@media (max-width: 900px){ .footer-grid{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px){ .footer-grid{ grid-template-columns: 1fr; } }

/* ---------- Reveal animation ---------- */
.reveal{ opacity:0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in{ opacity:1; transform:none; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero{
  padding: 70px 0 60px;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(ellipse at 10% 0%, rgba(200,162,77,0.14), transparent 50%);
}
.page-hero h1{ font-size: clamp(36px, 5vw, 56px); }
.page-hero p{ max-width: 60ch; font-size:16px; }

/* ---------- Floating chatbot widget (section 5.4) ---------- */
.chat-fab{
  position: fixed; right: 26px; bottom: 26px; z-index: 150;
  width: 58px; height:58px; border-radius:50%;
  background: var(--terracotta);
  color:#fdf9f2;
  display:flex; align-items:center; justify-content:center;
  font-size:24px; border:none; cursor:pointer;
  box-shadow: 0 10px 30px rgba(31,50,71,0.28);
}

.chatbot-panel{
  position: fixed;
  right: 26px;
  bottom: 98px;
  z-index: 160;
  width: 370px;
  max-width: calc(100vw - 40px);
  height: 560px;
  max-height: calc(100vh - 150px);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(31,50,71,0.22);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  transform: translateY(16px) scale(.98);
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.chatbot-panel.open{
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.chatbot-header{
  display:flex; align-items:center; justify-content:space-between;
  padding: 18px 20px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.chatbot-header strong{
  font-family: var(--serif);
  font-size: 16px;
  color: var(--ink);
  display:block;
}
.chatbot-header span{
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--gold-light);
}
.chatbot-close{
  background: none; border: none; cursor:pointer;
  font-size: 22px; color: var(--ink-muted); line-height:1;
}
.chatbot-messages{
  flex: 1;
  overflow-y: auto;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.chatbot-msg{
  font-size: 13.5px;
  line-height: 1.5;
  padding: 12px 16px;
  border-radius: 14px;
  max-width: 88%;
}
.chatbot-msg.from-bot{
  background: var(--bg-alt);
  color: var(--ink);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.chatbot-msg.from-user{
  background: var(--terracotta);
  color: #fdf9f2;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.chatbot-chips{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 20px 14px;
}
.chatbot-chip{
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--ink);
  cursor: pointer;
  transition: all .2s ease;
}
.chatbot-chip:hover{
  border-color: var(--gold-light);
  color: var(--gold-light);
}
.chatbot-inputrow{
  display:flex;
  gap: 10px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}
.chatbot-inputrow input{
  flex:1;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 11px 16px;
  font-family: var(--sans);
  font-size: 13.5px;
  background: var(--bg);
  color: var(--ink);
}
.chatbot-inputrow input:focus{ outline:none; border-color: var(--gold-light); }
.chatbot-inputrow button{
  width: 42px; height:42px; border-radius:50%;
  border:none; background: var(--terracotta); color:#fdf9f2;
  font-size:15px; cursor:pointer; flex-shrink:0;
}
@media (max-width: 480px){
  .chatbot-panel{ right: 14px; bottom: 88px; }
  .chat-fab{ right:14px; }
}