/* ============================================================
   culture-scientifique.css — Rubrique « Culture scientifique »
   Vulgarisation hors programme. Partagée par culture-scientifique.html
   (index) et les articles culture-scientifique/<slug>.html.
   Tokens du site + accent rubrique --cult (violet). Polices
   auto-hébergées (Bricolage Grotesque + Public Sans via fonts.css).
   ============================================================ */
:root{
  --ink:#15314f; --cult:#5b53a6; --bg:#f5f7f9; --surface:#ffffff;
  --line:#e4e9ee; --body:#4c5a68; --muted:#667085;
  --display:'Bricolage Grotesque',system-ui,-apple-system,sans-serif;
  --ui:'Public Sans',system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);font-family:var(--ui);-webkit-font-smoothing:antialiased;line-height:1.55}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:3px solid var(--cult);outline-offset:2px;border-radius:6px}
.cs-ic{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* ── En-tête ── */
.cs-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.cs-header-in{max-width:1160px;margin:0 auto;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.cs-logo{display:flex;align-items:center;gap:11px;color:inherit;text-decoration:none}
.cs-logo-badge{width:33px;height:33px;border-radius:9px;background:var(--ink);display:grid;place-items:center;color:#fff;flex:none}
.cs-logo-word{font-family:var(--display);font-weight:700;font-size:1.04rem;letter-spacing:-.01em;color:var(--ink)}
.cs-logo-word .dot{color:var(--muted);margin:0 1px}
.cs-back{display:inline-flex;align-items:center;gap:7px;color:var(--body);font-weight:600;font-size:.92rem;text-decoration:none;padding:8px 12px;border-radius:9px;transition:background .15s,color .15s}
.cs-back:hover{background:var(--bg);color:var(--ink)}

/* ── Hero ── */
.cs-hero{max-width:1160px;margin:0 auto;padding:clamp(34px,5vw,58px) 22px clamp(14px,2vw,20px);text-align:center}
.cs-kicker{font-size:.78rem;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--cult);margin-bottom:14px}
.cs-hero h1{font-family:var(--display);font-weight:700;font-size:clamp(1.9rem,4.6vw,2.9rem);line-height:1.07;letter-spacing:-.02em;color:var(--ink);margin:0}
.cs-hero-sub{font-size:clamp(1rem,1.7vw,1.14rem);color:var(--body);line-height:1.55;margin:16px auto 0;max-width:56ch}
.cs-note{font-size:.82rem;color:var(--muted);margin-top:16px}

/* ── Index : sections + tuiles ── */
.cs-main{max-width:1160px;margin:0 auto;padding:8px 22px 64px}
.cs-section{margin-top:30px}
.cs-section:first-child{margin-top:22px}
.cs-section-head{display:flex;align-items:center;gap:12px;margin:0 0 14px}
.cs-section-ico{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;flex:none;background:color-mix(in srgb,var(--cult) 12%,#fff);color:var(--cult)}
.cs-section-title{font-family:var(--display);font-weight:600;font-size:1.2rem;color:var(--ink)}
.cs-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:14px}
.cs-tile{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;min-height:176px;text-decoration:none;color:inherit;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}
.cs-tile:hover{transform:translateY(-4px);border-color:var(--cult);box-shadow:0 18px 40px -26px rgba(12,30,50,.5)}
.cs-tile-ico{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;background:color-mix(in srgb,var(--cult) 12%,#fff);color:var(--cult)}
.cs-tile-title{font-family:var(--display);font-weight:600;font-size:1.1rem;color:var(--ink);margin-top:15px}
.cs-tile-desc{font-size:.9rem;color:var(--body);line-height:1.45;margin-top:6px}
.cs-spacer{flex:1}
.cs-tile-cta{display:inline-flex;align-items:center;gap:7px;margin-top:16px;font-weight:600;font-size:.86rem;color:var(--cult)}

/* ── Article (culture-scientifique/<slug>.html) ── */
.cs-article{max-width:760px;margin:0 auto;padding:8px 22px 64px}
.cs-article-ico{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;margin:0 auto 4px;background:color-mix(in srgb,var(--cult) 12%,#fff);color:var(--cult)}
.cs-lead{font-size:1.08rem;color:var(--body);line-height:1.6}
/* Badge durée de lecture + sommaire (articles longs) */
.cs-readtime{display:inline-flex;align-items:center;gap:7px;margin-top:14px;font-size:.8rem;font-weight:600;color:var(--cult);background:color-mix(in srgb,var(--cult) 10%,#fff);border:1px solid color-mix(in srgb,var(--cult) 22%,#fff);border-radius:999px;padding:5px 13px}
.cs-toc{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin:24px 0}
.cs-toc-title{font-family:var(--display);font-weight:600;font-size:.8rem;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
.cs-toc ol{margin:0;padding-left:22px;color:var(--body);line-height:1.5}
.cs-toc li{margin:5px 0}
.cs-toc a{color:var(--body);text-decoration:none}
.cs-toc a:hover{color:var(--cult);text-decoration:underline}
.cs-article h2{font-family:var(--display);font-weight:600;font-size:1.32rem;color:var(--ink);letter-spacing:-.01em;margin:34px 0 10px;scroll-margin-top:80px}
.cs-article h3{font-family:var(--display);font-weight:600;font-size:1.08rem;color:var(--ink);margin:22px 0 6px}
.cs-article p{color:var(--body);line-height:1.65;margin:0 0 12px}
.cs-article strong{color:var(--ink);font-weight:700}
.cs-article ul{color:var(--body);line-height:1.6;padding-left:20px;margin:0 0 12px}
.cs-article li{margin:4px 0}
.cs-figure{margin:20px 0;text-align:center}
.cs-figure svg{max-width:100%;height:auto}
.cs-figure figcaption{font-size:.85rem;color:var(--muted);margin-top:8px}
.cs-featured-figure{margin:26px 0 30px}
.cs-featured-figure img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 42px -28px rgba(12,30,50,.65)}
.cs-featured-figure figcaption{max-width:62ch;margin:10px auto 0}
.cs-source-figure img{display:block;max-width:100%;height:auto;margin:0 auto;border:1px solid var(--line);border-radius:14px}
.cs-source-figure figcaption a{color:var(--cult);font-weight:600;text-decoration:none}
.cs-source-figure figcaption a:hover{text-decoration:underline}

/* Encadrés */
.cs-facts{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--cult);border-radius:0 14px 14px 0;padding:16px 20px;margin:20px 0}
.cs-facts-title{font-family:var(--display);font-weight:600;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase;color:var(--cult);margin:0 0 10px}
.cs-facts dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:6px 16px}
.cs-facts dt{color:var(--muted);font-size:.9rem}
.cs-facts dd{margin:0;color:var(--ink);font-weight:600;font-size:.92rem}
.cs-callout{background:color-mix(in srgb,var(--cult) 7%,#fff);border:1px solid color-mix(in srgb,var(--cult) 22%,#fff);border-radius:14px;padding:14px 18px;margin:20px 0;color:var(--body);line-height:1.6}
.cs-callout strong{color:var(--cult)}

/* Lien simulation + navigation bas de page */
.cs-simu{display:flex;align-items:center;gap:14px;background:var(--ink);border-radius:16px;padding:18px 20px;margin:26px 0;text-decoration:none;color:#fff;position:relative;overflow:hidden;transition:transform .16s ease,box-shadow .16s ease}
.cs-simu:hover{transform:translateY(-3px);box-shadow:0 22px 44px -28px rgba(12,30,50,.7)}
.cs-simu-ico{width:46px;height:46px;flex:none;border-radius:13px;display:grid;place-items:center;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18);color:#cec7ff}
.cs-simu-txt{flex:1;min-width:0}
.cs-simu-txt b{display:block;font-family:var(--display);font-weight:600;font-size:1.02rem}
.cs-simu-txt span{display:block;font-size:.86rem;color:rgba(255,255,255,.72);margin-top:2px}
.cs-simu-arrow{flex:none;color:#cec7ff}
.cs-prog{font-size:.9rem;color:var(--muted)}
.cs-prog a{color:var(--cult);font-weight:600;text-decoration:none}
.cs-prog a:hover{text-decoration:underline}
.cs-more{display:inline-flex;align-items:center;gap:8px;margin-top:30px;font-weight:600;color:var(--cult);text-decoration:none}
.cs-more:hover{text-decoration:underline}

/* Bloc « vérifié le / pour aller plus loin » en fin d'article (crédibilité) */
.cs-sources{margin:34px 0 4px;padding-top:16px;border-top:1px solid var(--line);font-size:.9rem;color:var(--muted)}
.cs-sources-verif{font-weight:600;color:var(--cult);font-size:.78rem;letter-spacing:.05em;text-transform:uppercase;margin:0 0 6px}
.cs-sources-label{font-weight:600;color:var(--ink);margin:8px 0 4px;font-size:.9rem}
.cs-sources ul{margin:0;padding-left:18px;line-height:1.6}
.cs-sources li{margin:3px 0}
.cs-sources a{color:var(--cult);font-weight:600;text-decoration:none}
.cs-sources a:hover{text-decoration:underline}

/* ── Footer ── */
.cs-footer{border-top:1px solid var(--line);background:var(--surface)}
.cs-footer-in{max-width:1160px;margin:0 auto;padding:22px;display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:space-between}
.cs-footer-credit{font-size:.85rem;color:var(--muted);max-width:78ch}
.cs-footer-credit a{color:var(--cult);font-weight:600;text-decoration:none}
.cs-footer-credit a:hover{text-decoration:underline}
.cs-footer-link{font-size:.85rem;color:var(--ink);font-weight:600;text-decoration:none;white-space:nowrap}
.cs-footer-link:hover{color:var(--cult)}

/* ── Animations illustratives des figures ──
   Mouvement léger pour donner vie aux schémas SVG. Entièrement neutralisé
   par le bloc @media (prefers-reduced-motion: reduce) ci-dessous
   (animation:none !important l'emporte sur ces sélecteurs de classe). ── */
@keyframes cs-spin{to{transform:rotate(360deg)}}
@keyframes cs-pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.08)}}
@keyframes cs-glow{0%,100%{opacity:.6}50%{opacity:1}}
@keyframes cs-twinkle{0%,100%{opacity:.4}50%{opacity:1}}
@keyframes cs-breathe{0%,100%{transform:scaleX(1)}50%{transform:scaleX(1.06)}}
@keyframes cs-draw{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}
@keyframes cs-ray{0%{transform:translateX(0);opacity:0}10%{opacity:1}82%{opacity:1;transform:translateX(var(--cs-dx,120px))}100%{transform:translateX(var(--cs-dx,120px));opacity:0}}
@keyframes cs-fly{0%{transform:translate(0,0);opacity:0}18%{opacity:1}100%{transform:translate(var(--cs-dx,60px),var(--cs-dy,0px));opacity:0}}
@keyframes cs-bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(var(--cs-dy,-100px))}}
@keyframes cs-zig{0%{transform:translate(0,0);opacity:0}12%{opacity:1}50%{transform:translate(var(--cs-x1,50px),var(--cs-y1,-100px));opacity:1}88%{opacity:1}100%{transform:translate(var(--cs-x2,180px),0);opacity:0}}

.cs-spin{transform-box:fill-box;transform-origin:center;animation:cs-spin 26s linear infinite}
.cs-spin-slow{transform-box:fill-box;transform-origin:center;animation:cs-spin 44s linear infinite}
.cs-pulse{transform-box:fill-box;transform-origin:center;animation:cs-pulse 3.2s ease-in-out infinite}
.cs-glow{animation:cs-glow 2.8s ease-in-out infinite}
.cs-twinkle{animation:cs-twinkle 2.6s ease-in-out infinite}
.cs-breathe{transform-box:fill-box;transform-origin:center;animation:cs-breathe 4.6s ease-in-out infinite}
.cs-draw{stroke-dasharray:1;animation:cs-draw 4s ease-in-out infinite}
.cs-ray{animation:cs-ray 3s linear infinite}
.cs-fly{animation:cs-fly 1.9s ease-out infinite}
.cs-bounce{animation:cs-bounce 1.5s ease-in-out infinite}
.cs-zig{animation:cs-zig 2.4s ease-in-out infinite}
.cs-hand{transform-box:view-box;animation:cs-spin 6s linear infinite}

/* ============================================================
   Composants ajoutés pour les articles 2026-07 (Fermi, grand
   filtre, constantes, énigmes) + interactifs de lumiere-couleurs.
   Rubrique volontairement en thème clair (comme les 16 articles
   existants) : pas de variante nuit ici.
   ============================================================ */

/* ── Bloc « À lire aussi » (maillage interne) ── */
.cs-related{margin:34px 0 4px;border-top:1px solid var(--line);padding-top:20px}
.cs-related-title{font-family:var(--display);font-weight:600;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}
.cs-related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.cs-related a{display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:11px 14px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.92rem;transition:border-color .15s,transform .15s}
.cs-related a:hover{border-color:var(--cult);transform:translateY(-2px)}
.cs-related a .cs-ic{color:var(--cult);flex:none}

/* ── Calculette de l'équation de Drake (paradoxe de Fermi) ── */
.cs-drake{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;margin:24px 0}
.cs-drake-row{display:grid;grid-template-columns:1fr auto;align-items:center;gap:6px 14px;padding:11px 0;border-bottom:1px solid var(--line)}
.cs-drake-row:last-of-type{border-bottom:0}
.cs-drake-lab{font-size:.92rem;color:var(--body)}
.cs-drake-lab b{color:var(--ink);font-family:var(--display)}
.cs-drake-val{font-variant-numeric:tabular-nums;font-weight:700;color:var(--cult);font-size:.95rem;min-width:74px;text-align:right}
.cs-drake input[type=range]{grid-column:1 / -1;width:100%;accent-color:var(--cult);height:22px;cursor:pointer;touch-action:pan-y}
.cs-drake-out{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;gap:8px;margin-top:18px;padding-top:16px;border-top:2px solid color-mix(in srgb,var(--cult) 30%,#fff)}
.cs-drake-out .n{font-family:var(--display);font-weight:700;font-size:clamp(2rem,7vw,2.8rem);color:var(--cult);line-height:1;font-variant-numeric:tabular-nums}
.cs-drake-out .lbl{font-size:.9rem;color:var(--body)}

/* ── Escalier des étapes (grand filtre) ── */
.cs-steps{list-style:none;counter-reset:step;margin:24px 0;padding:0}
.cs-steps li{counter-increment:step;position:relative;background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--cult);border-radius:0 12px 12px 0;padding:12px 16px 12px 52px;margin:0 0 8px}
.cs-steps li::before{content:counter(step);position:absolute;left:12px;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:50%;background:color-mix(in srgb,var(--cult) 14%,#fff);color:var(--cult);font-family:var(--display);font-weight:700;font-size:.95rem;display:grid;place-items:center}
.cs-steps li b{color:var(--ink);font-family:var(--display)}
.cs-steps li.is-filter{border-left-color:var(--fig-rose,#b23b5e)}
.cs-steps li.is-filter::before{background:color-mix(in srgb,#b23b5e 14%,#fff);color:#b23b5e}

/* ── Table de constantes (constantes physiques) ── */
.cs-constants{width:100%;border-collapse:collapse;margin:22px 0;font-size:.92rem}
.cs-constants caption{caption-side:top;text-align:left;font-family:var(--display);font-weight:600;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.cs-constants th,.cs-constants td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:baseline}
.cs-constants thead th{font-size:.78rem;letter-spacing:.03em;text-transform:uppercase;color:var(--muted);font-weight:600}
.cs-constants tbody th{font-weight:700;color:var(--cult);white-space:nowrap;font-variant-numeric:tabular-nums}
.cs-constants td.val{font-variant-numeric:tabular-nums;color:var(--ink);white-space:nowrap}
.cs-constants td.desc{color:var(--body)}
.cs-constants-wrap{overflow-x:auto}

/* ── Grille de cartes d'énigmes ── */
.cs-enigmas{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin:22px 0}
.cs-enigma{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.cs-enigma h3{font-family:var(--display);font-weight:600;font-size:1rem;color:var(--ink);margin:0 0 6px;display:flex;align-items:center;gap:9px}
.cs-enigma h3 .cs-ic{color:var(--cult);flex:none}
.cs-enigma p{font-size:.88rem;color:var(--body);line-height:1.5;margin:0}

/* ── Interactifs Canvas (lumiere-couleurs) ── */
.cs-interactive{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;margin:24px 0}
.cs-interactive canvas{display:block;width:100%;height:auto;border-radius:10px;background:#0b0d12;touch-action:none}
.cs-interactive.is-light canvas{background:#f0f2f5}
.cs-controls{margin-top:14px;display:flex;flex-direction:column;gap:12px}
.cs-control{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px}
.cs-control label{font-size:.9rem;color:var(--body)}
.cs-control input[type=range]{width:100%;accent-color:var(--cult);height:22px;cursor:pointer;touch-action:pan-y}
.cs-control output{font-variant-numeric:tabular-nums;font-weight:700;color:var(--cult);min-width:88px;text-align:right;font-size:.9rem}
.cs-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.cs-chip{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:6px 14px;font:inherit;font-size:.86rem;font-weight:600;color:var(--body);cursor:pointer;transition:border-color .15s,color .15s,background .15s}
.cs-chip[aria-pressed=true]{border-color:var(--cult);color:var(--cult);background:color-mix(in srgb,var(--cult) 10%,#fff)}
.cs-swatch{display:inline-block;width:20px;height:20px;border-radius:6px;border:1px solid rgba(0,0,0,.12);vertical-align:-4px;margin-right:6px}
.cs-ctrl-lab{margin:0 0 6px;font-size:.85rem;font-weight:600;color:var(--muted)}
.cs-msg{margin:4px 0 0;font-size:.9rem;color:var(--body)}
.cs-msg b{color:var(--ink)}

@media (max-width:520px){
  .cs-drake-val{min-width:64px}
  .cs-control{grid-template-columns:1fr;gap:4px}
  .cs-control output{text-align:left}
}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
  html{scroll-behavior:auto}
}