/* ==========================================================================
   LE GRAND VOYAGE DES NOMBRES — styles
   ========================================================================== */

:root{
  --nuit:#1b1a3a;
  --nuit-clair:#2a2856;
  --parchemin:#f6efe0;
  --parchemin-fonce:#ece0c4;
  --encre:#2b2440;
  --encre-douce:#4a4360;
  --ocre:#c97f2b;
  --terre:#b6482f;
  --or:#d4a24c;
  --bordure:#d9cca4;
  --map-sea:#dfeaf1;
  --map-land:#c9dac2;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Nunito', system-ui, sans-serif;

  --radius-lg: 28px;
  --radius-md: 16px;
  --shadow-soft: 0 14px 34px rgba(27,26,58,0.14);
}

*,*::before,*::after{ box-sizing:border-box; }

html{
  scroll-behavior:smooth;
  scroll-padding-top: 92px;
}
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
}

body{
  margin:0;
  font-family:var(--font-body);
  color:var(--encre);
  background:var(--parchemin);
  line-height:1.55;
  font-size:17px;
}

h1,h2,h3{
  font-family:var(--font-display);
  margin:0;
  color:var(--encre);
  line-height:1.1;
}

p{ margin:0 0 .8em; }
p:last-child{ margin-bottom:0; }

.visually-hidden{
  position:absolute; width:1px; height:1px; overflow:hidden;
  clip:rect(0 0 0 0); white-space:nowrap;
}

a{ color:inherit; }

img,svg{ max-width:100%; display:block; }

/* ---------------------------------- En-tête ---------------------------------- */
.top-bar{
  position:sticky; top:0; z-index:40;
  display:flex; align-items:center; justify-content:space-between;
  padding:.7rem 1.2rem;
  background:var(--nuit);
  color:var(--parchemin);
  box-shadow:0 2px 10px rgba(0,0,0,.18);
}
.top-bar__brand{ display:flex; align-items:center; gap:.5rem; font-family:var(--font-display); font-weight:600; font-size:1.05rem; }
.top-bar__icon{ font-size:1.3rem; }
.top-bar__toggle{
  display:none;
  background:var(--nuit-clair); color:var(--parchemin); border:1px solid rgba(255,255,255,.15);
  border-radius:999px; padding:.45rem .9rem; font-family:var(--font-body); font-weight:700; font-size:.85rem;
  cursor:pointer;
}

.timeline-nav{
  position:sticky; top:48px; z-index:39;
  background:var(--nuit-clair);
  border-bottom:1px solid rgba(255,255,255,.08);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.timeline-nav__list{
  list-style:none; display:flex; gap:1.4rem;
  margin:0; padding:.55rem 1.2rem;
  min-width:max-content;
}
.timeline-nav__list a{
  display:flex; align-items:center; gap:.4rem;
  text-decoration:none; color:#cfcbe8; font-size:.82rem; font-weight:700;
  padding:.3rem .2rem; border-bottom:2px solid transparent;
  white-space:nowrap;
  transition:color .15s ease, border-color .15s ease;
}
.timeline-nav__list a:hover,
.timeline-nav__list a:focus-visible{ color:#fff; }
.timeline-nav__list a.is-active{ color:#fff; border-bottom-color:var(--or); }
.timeline-nav__dot{
  width:9px; height:9px; border-radius:50%;
  background:var(--c, var(--or));
  box-shadow:0 0 0 3px rgba(255,255,255,.08);
}

@media (max-width: 760px){
  .top-bar__toggle{ display:inline-flex; align-items:center; gap:.3rem; }
  .timeline-nav.is-collapsed{ display:none; }
}

/* ---------------------------------- Hero ---------------------------------- */
.hero{
  position:relative;
  min-height:88vh;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  text-align:center;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(255,255,255,.08), transparent 45%),
    radial-gradient(ellipse at 80% 70%, rgba(255,255,255,.06), transparent 40%),
    linear-gradient(180deg, var(--nuit) 0%, #221f4a 100%);
  color:var(--parchemin);
  padding:3rem 1.4rem;
  overflow:hidden;
}
.hero__stars{
  position:absolute; inset:0;
  background-image:
    radial-gradient(1.5px 1.5px at 10% 20%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 80% 15%, #fff, transparent),
    radial-gradient(1px 1px at 60% 40%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 30% 70%, #fff, transparent),
    radial-gradient(1px 1px at 90% 60%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 45% 85%, #fff, transparent),
    radial-gradient(1px 1px at 15% 55%, #fff, transparent);
  opacity:.5;
}
.hero__content{ position:relative; max-width:640px; }
.hero__eyebrow{
  font-weight:800; letter-spacing:.02em; color:var(--or);
  font-size:1rem; margin-bottom:.6rem;
}
.hero__title{
  font-size:clamp(2.4rem, 6vw, 4.2rem);
  font-weight:700;
  margin-bottom:1rem;
}
.hero__subtitle{
  font-size:1.1rem;
  color:#d9d6ef;
  max-width:520px;
  margin:0 auto 1.8rem;
}
.hero__cta{
  display:inline-block;
  background:var(--or); color:var(--nuit);
  font-weight:800; text-decoration:none;
  padding:.85rem 1.7rem; border-radius:999px;
  box-shadow:0 10px 24px rgba(212,162,76,.35);
  transition:transform .18s ease;
}
.hero__cta:hover{ transform:translateY(-2px); }
.hero__hint{
  position:relative;
  margin-top:2.6rem; font-size:.85rem; color:#a8a4cf;
  animation:bob 2.4s ease-in-out infinite;
}
@keyframes bob{ 0%,100%{transform:translateY(0);} 50%{transform:translateY(6px);} }
@media (prefers-reduced-motion:reduce){ .hero__hint{ animation:none; } }

/* ---------------------------------- Sections "époque" ---------------------------------- */
.era{
  padding:4.5rem 1.2rem;
  display:flex; justify-content:center;
  background:var(--era-bg, var(--parchemin));
}
.era--dark{ color:var(--parchemin); }
.era--dark .era__title,
.era--dark .era__place{ color:var(--parchemin); }
.era--dark .era__card{ background:#2a2452; border-color:#3a3468; }

.era__card{
  width:100%; max-width:900px;
  background:#fffdf8;
  border:1px solid var(--bordure);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-soft);
  padding:2.2rem clamp(1.2rem, 4vw, 3rem);
  position:relative;
}
.era__card::before{
  content:"";
  position:absolute; left:0; top:2.4rem; bottom:2.4rem; width:5px;
  background:var(--era-color, var(--or));
  border-radius:4px;
}

.era__header{ margin-bottom:1.6rem; }
.era__badge{
  display:inline-block;
  background:color-mix(in srgb, var(--era-color, var(--or)) 16%, white);
  color:var(--era-color, var(--ocre));
  font-weight:800; font-size:.82rem;
  padding:.3rem .8rem; border-radius:999px;
  margin-bottom:.7rem;
}
.era__title{ font-size:clamp(1.5rem, 3.4vw, 2.1rem); margin-bottom:.5rem; }
.era__place{ font-size:.95rem; color:var(--encre-douce); font-weight:700; margin:0; }

.era__body{
  display:grid; grid-template-columns:1.15fr .85fr; gap:2.2rem;
  align-items:start;
  margin-bottom:1.6rem;
}
.era__text p{ font-size:1.02rem; }
.era__note{
  background:var(--parchemin-fonce);
  border-radius:var(--radius-md);
  padding:.8rem 1rem;
  font-size:.92rem;
}
.era--dark .era__note{ background:#3a3468; }

@media (max-width: 720px){
  .era__body{ grid-template-columns:1fr; }
}

/* -- visuels génériques -- */
.era__visual{ display:flex; flex-direction:column; align-items:center; gap:.6rem; }
.visual-caption{ font-size:.85rem; color:var(--encre-douce); text-align:center; }
.era--dark .visual-caption{ color:#c6c2ea; }

.bone-illustration{ width:100%; max-width:320px; }

.symbol-row{ display:flex; flex-wrap:wrap; gap:.7rem; justify-content:center; }
.symbol-chip{
  display:flex; flex-direction:column; align-items:center; gap:.25rem;
  background:var(--parchemin-fonce);
  border-radius:14px; padding:.6rem .5rem .5rem;
  min-width:74px;
}
.symbol-chip svg{ width:34px; height:34px; }
.symbol-chip span{ font-size:.72rem; font-weight:700; text-align:center; color:var(--encre-douce); }

.roman-plate{
  display:flex; gap:.5rem; flex-wrap:wrap; justify-content:center;
  background:#f3e6d8; border:2px solid #d9c3a6; border-radius:16px; padding:1rem 1.2rem;
}
.roman-plate span{
  font-family:var(--font-display); font-weight:700; font-size:1.6rem; color:#7a3b2c;
}

.digits-evolution{ width:100%; }
.digits-evolution__row{
  display:flex; flex-direction:column; align-items:center; gap:.2rem;
  background:var(--parchemin-fonce); border-radius:12px; padding:.6rem .8rem; text-align:center;
}
.digits-evolution__label{ font-size:.72rem; font-weight:800; color:var(--encre-douce); text-transform:none; }
.digits-evolution__digits{ font-size:1.3rem; letter-spacing:.08em; }
.digits-evolution__arrow{ text-align:center; color:var(--era-color,var(--ocre)); font-weight:800; margin:.2rem 0; }

.quote-card{
  background:var(--parchemin-fonce); border-left:4px solid var(--era-color,var(--ocre));
  border-radius:10px; padding:1rem 1.1rem;
}
.quote-card p{ font-style:italic; margin-bottom:.4rem; }
.quote-card span{ font-size:.8rem; color:var(--encre-douce); }

.vs-card{
  display:flex; align-items:center; gap:.8rem; width:100%;
  background:var(--parchemin-fonce); border-radius:14px; padding:1rem;
}
.vs-card__side{ display:flex; flex-direction:column; gap:.2rem; flex:1; text-align:center; }
.vs-card__title{ font-family:var(--font-display); font-weight:700; color:var(--era-color,var(--ocre)); }
.vs-card__side span:last-child{ font-size:.78rem; color:var(--encre-douce); }
.vs-card__vs{ font-weight:800; color:var(--encre-douce); font-size:.8rem; }

.binary-card{
  background:#302a5c; border-radius:14px; padding:1.2rem; text-align:center; width:100%;
}
.binary-card__label{ display:block; font-size:.85rem; color:#cfcbea; margin-bottom:.6rem; }
.binary-card__bits{ display:flex; gap:.4rem; justify-content:center; margin-bottom:.6rem; }
.bit{
  width:34px; height:34px; border-radius:8px;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--font-display); font-weight:700; font-size:1.1rem;
}
.bit--on{ background:var(--or); color:#241f3a; }
.bit--off{ background:#463f7c; color:#a8a3d8; }
.binary-card__formula{ font-size:.85rem; color:#cfcbea; }

/* -- carte miniature -- */
.era__map{ display:flex; flex-direction:column; align-items:center; gap:.4rem; margin-bottom:1.6rem; }
.mini-map{
  position:relative; width:100%; max-width:280px;
  border-radius:14px; overflow:hidden; border:1px solid var(--bordure);
}
.mini-map__world{ width:100%; display:block; }
.mini-map__pin{ position:absolute; transform:translate(-50%,-50%); }
.mini-map__pin--alt{ }
.mini-map__pulse{
  display:block; width:12px; height:12px; border-radius:50%;
  background:var(--terre); box-shadow:0 0 0 4px rgba(182,72,47,.28);
  position:relative;
}
.mini-map__pulse::after{
  content:""; position:absolute; inset:-6px; border-radius:50%;
  border:2px solid rgba(182,72,47,.5);
  animation:ping 2.2s ease-out infinite;
}
@keyframes ping{ 0%{transform:scale(.5); opacity:1;} 100%{transform:scale(2.1); opacity:0;} }
@media (prefers-reduced-motion:reduce){ .mini-map__pulse::after{ animation:none; } }
.mini-map__label{ font-size:.8rem; font-weight:700; color:var(--encre-douce); }
.era--dark .mini-map__label{ color:#c6c2ea; }

/* -- bouton "en savoir plus" -- */
.era__more{
  display:inline-flex; align-items:center; gap:.4rem;
  background:transparent; border:2px solid var(--era-color, var(--ocre));
  color:var(--era-color, var(--ocre));
  font-family:var(--font-body); font-weight:800; font-size:.9rem;
  padding:.6rem 1.2rem; border-radius:999px; cursor:pointer;
  transition:background .15s ease, color .15s ease;
}
.era__more:hover, .era__more:focus-visible{
  background:var(--era-color, var(--ocre)); color:#fff;
}

/* ---------------------------------- Reveal au scroll ---------------------------------- */
.reveal{
  opacity:0; transform:translateY(26px);
  transition:opacity .6s ease, transform .6s ease;
}
.reveal.is-visible{ opacity:1; transform:translateY(0); }
@media (prefers-reduced-motion:reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
}

/* ---------------------------------- Calculette ---------------------------------- */
.tool-section{ padding:4.5rem 1.2rem; display:flex; justify-content:center; background:#fbf6ea; }
.tool-card{
  width:100%; max-width:900px;
  background:#fffdf8; border:1px solid var(--bordure);
  border-radius:var(--radius-lg); box-shadow:var(--shadow-soft);
  padding:2.2rem clamp(1.2rem,4vw,3rem);
}
.tool-card__title{ font-size:clamp(1.5rem,3vw,2rem); margin-bottom:.5rem; }
.tool-card__intro{ color:var(--encre-douce); margin-bottom:1.4rem; max-width:60ch; }
.tool-card__controls{
  display:flex; flex-wrap:wrap; align-items:center; gap:.8rem;
  background:var(--parchemin-fonce); border-radius:14px; padding:1rem 1.2rem; margin-bottom:1.6rem;
}
.tool-card__controls label{ font-weight:800; }
#numberInput{
  width:6.5rem; padding:.5rem .6rem; font-size:1.1rem; font-family:var(--font-body); font-weight:700;
  border:2px solid var(--bordure); border-radius:10px; background:#fff; color:var(--encre);
}
#numberSlider{ flex:1; min-width:160px; accent-color:var(--terre); }

.tool-card__results{
  display:grid; grid-template-columns:repeat(auto-fit, minmax(200px,1fr)); gap:1.1rem;
}
.result-block{
  background:var(--parchemin-fonce); border-radius:16px; padding:1rem 1.1rem;
  border-top:4px solid var(--block-color, var(--ocre));
}
.result-block h3{ font-size:1rem; margin-bottom:.6rem; color:var(--block-color, var(--ocre)); }
.result-block__symbols{ display:flex; flex-wrap:wrap; gap:.35rem; align-items:flex-end; min-height:2.4rem; }
.result-block__note{ font-size:.78rem; color:var(--encre-douce); margin-top:.5rem; }

.chip-1{ display:inline-flex; align-items:center; justify-content:center; width:22px; height:22px; }
.egy-1{ width:3px; height:20px; background:#7a4a15; border-radius:2px; }
.egy-10{ width:18px; height:14px; border:2.6px solid #7a4a15; border-top:none; border-radius:0 0 10px 10px; }
.egy-100{ width:18px; height:18px; border-radius:50%; border:2.6px dashed #7a4a15; }

.rom-letter{ font-family:var(--font-display); font-weight:700; font-size:1.4rem; color:#7a3b2c; }

.maya-col{ display:flex; flex-direction:column-reverse; align-items:center; gap:3px; padding:.2rem .4rem; }
.maya-digit{ display:flex; flex-direction:column-reverse; align-items:center; gap:2px; }
.maya-dot{ width:9px; height:9px; border-radius:50%; background:#1e6b4f; }
.maya-bar{ width:26px; height:6px; border-radius:3px; background:#1e6b4f; }
.maya-shell{ width:18px; height:18px; border-radius:50%; border:2px solid #1e6b4f; }
.maya-sep{ width:100%; border-top:1px dashed #b7c9be; margin:2px 0; }

.bab-digit{ display:flex; flex-direction:column; align-items:center; gap:2px; padding:0 .3rem; }
.bab-clou{ width:0; height:0; border-left:4px solid transparent; border-right:4px solid transparent; border-top:12px solid #7a2e1c; }
.bab-chevron{ width:0; height:0; border-top:4px solid transparent; border-bottom:4px solid transparent; border-right:12px solid #7a2e1c; }
.bab-group{ display:flex; flex-wrap:wrap; gap:2px; max-width:70px; }
.bab-sep{ font-weight:800; color:var(--encre-douce); align-self:center; }

/* ---------------------------------- Carte récapitulative ---------------------------------- */
.map-section{ padding:4.5rem 1.2rem 6rem; display:flex; justify-content:center; background:var(--nuit); }
.map-card{
  width:100%; max-width:960px; color:var(--parchemin); text-align:center;
}
.map-card__title{ font-size:clamp(1.6rem,3.4vw,2.2rem); margin-bottom:.5rem; }
.map-card__intro{ color:#c6c2ea; margin-bottom:1.6rem; }

.big-map{
  position:relative; border-radius:20px; overflow:hidden;
  border:1px solid rgba(255,255,255,.12); box-shadow:var(--shadow-soft);
  margin-bottom:1.8rem;
}
.big-map__world{ width:100%; display:block; }
.big-map__pin{
  position:absolute; transform:translate(-50%,-50%);
  display:flex; flex-direction:column; align-items:center; gap:.25rem;
  background:none; border:none; cursor:pointer; padding:.2rem;
}
.big-map__dot{
  width:14px; height:14px; border-radius:50%; border:2px solid #fff;
  box-shadow:0 0 0 4px rgba(255,255,255,.18);
  transition:transform .15s ease;
}
.big-map__pin:hover .big-map__dot,
.big-map__pin:focus-visible .big-map__dot{ transform:scale(1.3); }
.big-map__tag{
  font-size:.68rem; font-weight:800; color:var(--nuit);
  background:#fff; padding:.15rem .5rem; border-radius:999px;
  white-space:nowrap;
}

.map-card__back{
  background:var(--or); color:var(--nuit); border:none; font-weight:800;
  padding:.75rem 1.5rem; border-radius:999px; cursor:pointer; font-size:.95rem;
}

/* ---------------------------------- Pied de page ---------------------------------- */
.site-footer{
  background:#15142c; color:#9d99c4; text-align:center;
  padding:2.4rem 1rem; font-size:.85rem;
}
.site-footer__top{ display:inline-block; margin-top:.6rem; color:var(--or); text-decoration:none; font-weight:700; }

/* ---------------------------------- Bouton retour en haut ---------------------------------- */
.scroll-top{
  position:fixed; right:1.1rem; bottom:1.1rem; z-index:45;
  width:46px; height:46px; border-radius:50%;
  background:var(--nuit); color:var(--parchemin); border:none;
  font-size:1.2rem; cursor:pointer; box-shadow:0 8px 18px rgba(0,0,0,.25);
  opacity:0; pointer-events:none; transform:translateY(10px);
  transition:opacity .25s ease, transform .25s ease;
}
.scroll-top.is-visible{ opacity:1; pointer-events:auto; transform:translateY(0); }

/* ---------------------------------- Fenêtres modales ---------------------------------- */
.modal{
  border:none; border-radius:var(--radius-lg); padding:0;
  max-width:min(520px, 92vw);
  box-shadow:0 20px 60px rgba(0,0,0,.35);
  background:#fffdf8;
}
.modal::backdrop{ background:rgba(20,18,40,.6); backdrop-filter:blur(2px); }
.modal__inner{ position:relative; padding:2rem 1.6rem 1.8rem; }
.modal__close{
  position:absolute; top:.9rem; right:.9rem;
  background:var(--parchemin-fonce); border:none; width:34px; height:34px; border-radius:50%;
  font-size:1rem; cursor:pointer; color:var(--encre);
}
.modal h3{ font-size:1.25rem; margin-bottom:.8rem; padding-right:2rem; }
.modal p{ color:var(--encre-douce); }
.modal__ok{
  margin-top:1.2rem; background:var(--nuit); color:var(--parchemin); border:none;
  padding:.65rem 1.3rem; border-radius:999px; font-weight:700; cursor:pointer;
}

/* ---------------------------------- Focus visible cohérent ---------------------------------- */
:focus-visible{ outline:3px solid var(--or); outline-offset:2px; }