/* ==========================================================
   PaaS vitrine v2 — Composants UI
   Boutons, Cards, Pills, Navigation, Formulaires, Terminal
   ========================================================== */

/* ============================================================
   1. BOUTONS
   ============================================================ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  gap:var(--sp-2);
  font-family:var(--ff-body);
  font-weight:600;
  font-size:var(--fs-sm);
  letter-spacing:0.005em;
  line-height:1;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:var(--r-md);
  cursor:pointer;
  transition:transform var(--t-fast),
             box-shadow var(--t-base),
             background var(--t-base),
             border-color var(--t-base),
             color var(--t-base);
  white-space:nowrap;
  user-select:none;
}
.btn svg{width:1em;height:1em;flex-shrink:0}
.btn:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px}
.btn:disabled,.btn[aria-disabled="true"]{opacity:0.5;cursor:not-allowed}

/* Tailles */
.btn-sm  {padding:9px 14px;font-size:var(--fs-xs)}
.btn-md  {padding:12px 18px;font-size:var(--fs-sm)}
.btn-lg  {padding:16px 24px;font-size:var(--fs-md)}
.btn-xl  {padding:18px 28px;font-size:15.5px}

/* btnrefine 2026-05-26 — calmer CTAs:
   - Primary: slightly muted cyan, softer shadow, tighter letter-spacing
   - Secondary: subtle hover lift, gentler border tint
   - Ghost: hover lift + softer hover ground */
.btn-primary{
  background:var(--g-cta);
  color:#03101A;
  border-color:rgba(0,229,255,0.42);
  box-shadow:
    0 0 0 1px rgba(0,229,255,0.22) inset,
    0 8px 24px rgba(0,217,255,0.18),
    0 2px 6px rgba(0,217,255,0.10);
  letter-spacing:-0.005em;
}
.btn-primary:hover{
  background:var(--g-cta-hover);
  box-shadow:
    0 0 0 1px rgba(0,229,255,0.34) inset,
    0 12px 32px rgba(0,217,255,0.26),
    0 3px 8px rgba(0,217,255,0.14);
  transform:translateY(-1px);
}
.btn-primary:active{transform:translateY(0);box-shadow:
  0 0 0 1px rgba(0,229,255,0.22) inset,
  0 4px 12px rgba(0,217,255,0.14);
}

/* Variantes — Secondary (ghost glass, calmer hover) */
.btn-secondary{
  background:rgba(15,22,38,0.45);
  color:var(--c-text);
  border-color:rgba(199,208,224,0.18);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  letter-spacing:-0.005em;
}
.btn-secondary:hover{
  background:rgba(15,22,38,0.78);
  border-color:rgba(0,229,255,0.32);
  color:var(--c-cyan);
  transform:translateY(-1px);
}
.btn-secondary:active{transform:translateY(0)}

/* Variantes — Tertiary (link-style, softer hover) */
.btn-ghost{
  background:transparent;
  color:var(--c-text-body);
  padding-left:var(--sp-3);padding-right:var(--sp-3);
  letter-spacing:-0.005em;
}
.btn-ghost:hover{
  color:var(--c-cyan);
  background:rgba(0,229,255,0.045);
  transform:translateY(-1px);
}
.btn-ghost:active{transform:translateY(0)}

/* Variante — Violet */
.btn-violet{
  background:linear-gradient(135deg,#8B5CF6 0%,#7C3AED 100%);
  color:#fff;
  border-color:rgba(139,92,246,0.55);
  box-shadow:
    0 0 0 1px rgba(139,92,246,0.32) inset,
    0 0 28px rgba(139,92,246,0.36),
    0 12px 36px rgba(139,92,246,0.18);
}
.btn-violet:hover{transform:translateY(-1px);box-shadow:
  0 0 0 1px rgba(139,92,246,0.48) inset,
  0 0 36px rgba(139,92,246,0.50),
  0 16px 44px rgba(139,92,246,0.22);
}

/* Play icon (bouton démo) */
.btn .play{
  width:22px;height:22px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  background:rgba(0,229,255,0.12);
  border:1px solid rgba(0,229,255,0.4);
  margin-right:var(--sp-1);
}
.btn .play svg{width:9px;height:9px;fill:var(--c-cyan);margin-left:1px}

/* ============================================================
   2. CARDS (surfaces glassmorphism)
   ============================================================ */
.card{
  position:relative;
  background:var(--g-surface);
  border:1px solid var(--c-border);
  border-radius:var(--r-xl);
  padding:var(--sp-7);
  box-shadow:var(--shadow-card);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:transform var(--t-base),
             box-shadow var(--t-base),
             border-color var(--t-base);
  overflow:hidden;
}
.card:hover{
  transform:translateY(-4px);
  border-color:var(--c-border-strong);
  box-shadow:var(--shadow-card-h);
}
.card.card-glow::before{
  content:"";position:absolute;inset:-1px;border-radius:inherit;
  background:linear-gradient(135deg, rgba(0,229,255,0.12), transparent 40%, rgba(139,92,246,0.12) 100%);
  z-index:-1;opacity:0;transition:opacity var(--t-base);
  pointer-events:none;
}
.card.card-glow:hover::before{opacity:1}
.card .card-icon{
  width:48px;height:48px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:var(--r-md);
  background:linear-gradient(135deg, rgba(0,229,255,0.12), rgba(139,92,246,0.06));
  border:1px solid var(--c-border-strong);
  color:var(--c-cyan);
  margin-bottom:var(--sp-5);
}
.card .card-icon svg{width:22px;height:22px}
.card .card-title{
  font-family:var(--ff-display);font-weight:600;
  font-size:var(--fs-lg);
  color:var(--c-text);
  margin-bottom:var(--sp-3);
  letter-spacing:-0.012em;
}
.card .card-desc{
  font-size:var(--fs-sm);
  line-height:1.6;
  color:var(--c-text-body);
}

/* Card variantes */
.card-violet .card-icon{
  color:var(--c-violet);
  border-color:var(--c-border-violet);
  background:linear-gradient(135deg, rgba(139,92,246,0.12), rgba(0,229,255,0.06));
}
.card-green .card-icon{
  color:var(--c-green);
  border-color:rgba(0,255,163,0.25);
  background:linear-gradient(135deg, rgba(0,255,163,0.10), rgba(0,229,255,0.04));
}

/* Card numérotée (pour roadmap, processus) */
.card-numbered{
  position:relative;
}
.card-numbered .card-num{
  position:absolute;top:var(--sp-4);right:var(--sp-5);
  font-family:var(--ff-mono);font-size:var(--fs-2xl);font-weight:600;
  color:transparent;
  -webkit-text-stroke:1px rgba(0,229,255,0.35);
  opacity:0.6;
  line-height:1;
}

/* ============================================================
   3. PILLS / BADGES
   ============================================================ */
.pill{
  display:inline-flex;align-items:center;gap:var(--sp-2);
  font-family:var(--ff-mono);
  font-size:10.5px;font-weight:600;
  letter-spacing:var(--tracking-wide);
  text-transform:uppercase;
  padding:6px 10px;
  border-radius:var(--r-sm);
  color:var(--c-text-muted);
  border:1px solid var(--c-border);
  background:rgba(15,22,38,0.55);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.pill-cyan   {color:var(--c-cyan);    border-color:rgba(0,229,255,0.35);  background:rgba(0,229,255,0.06)}
.pill-violet {color:var(--c-violet);  border-color:rgba(139,92,246,0.35); background:rgba(139,92,246,0.06)}
.pill-green  {color:var(--c-green);   border-color:rgba(0,255,163,0.35);  background:rgba(0,255,163,0.06)}
.pill-amber  {color:var(--c-amber);   border-color:rgba(255,180,84,0.35); background:rgba(255,180,84,0.06)}
.pill-red    {color:var(--c-red);     border-color:rgba(255,85,119,0.35); background:rgba(255,85,119,0.06)}

.pill-live{
  display:inline-flex;align-items:center;gap:var(--sp-2);
  font-family:var(--ff-mono);font-size:var(--fs-xs);
  color:var(--c-green);letter-spacing:var(--tracking-wide);
  text-transform:uppercase;
}
.pill-live::before{
  content:"";width:7px;height:7px;border-radius:50%;
  background:var(--c-green);
  box-shadow:var(--glow-green);
  animation:pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:0.5;transform:scale(1.3)}
}

/* ============================================================
   4. HEADER NAV
   ============================================================ */
.site-header{
  position:fixed;top:0;left:0;right:0;
  z-index:var(--z-overlay);
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(20px, 4vw, 64px);
  background:linear-gradient(180deg, rgba(5,8,16,0.85), rgba(5,8,16,0.55));
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--c-border);
  transition:background var(--t-base), border-color var(--t-base);
}
.site-header.scrolled{
  background:rgba(5,8,16,0.92);
  border-bottom-color:var(--c-border-strong);
}
.site-header .logo{
  display:flex;align-items:center;gap:10px;
  font-family:var(--ff-display);font-weight:700;
  color:var(--c-text);font-size:20px;
  letter-spacing:-0.02em;
  text-decoration:none;
}
.site-header .logo-mark{width:36px;height:36px;flex-shrink:0;filter:drop-shadow(0 0 12px rgba(0,217,255,0.18))}
.site-header .logo-word{font-family:var(--ff-display);font-weight:700;letter-spacing:-0.02em}
.site-header .logo-dot{display:none}

.site-nav{
  display:flex;align-items:center;gap:36px;
}
.site-nav a{
  font-size:14.5px;font-weight:500;
  color:var(--c-text-body);
  text-decoration:none;
  position:relative;padding:8px 2px;
  letter-spacing:0.005em;
  transition:color var(--t-fast);
}
.site-nav a:hover,.site-nav a.active{color:var(--c-text)}
.site-nav a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;
  background:linear-gradient(90deg, transparent, var(--c-cyan), transparent);
}

.header-actions{
  display:flex;align-items:center;gap:14px;
}

/* Language switcher */
.lang-switch{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 10px;
  border:1px solid var(--c-border);
  border-radius:var(--r-sm);
  font-family:var(--ff-mono);font-size:11.5px;
  letter-spacing:0.08em;
  color:var(--c-text-muted);
  text-transform:uppercase;
}
.lang-switch button{
  color:inherit;padding:0;font-size:inherit;letter-spacing:inherit;
  transition:color var(--t-fast);
}
.lang-switch button:hover{color:var(--c-text)}
.lang-switch button.active{color:var(--c-text)}
.lang-switch .sep{color:rgba(199,208,224,0.18)}

/* Mobile burger */
.menu-toggle{
  display:none;
  width:40px;height:40px;
  align-items:center;justify-content:center;
  color:var(--c-text);
  border:1px solid var(--c-border);
  border-radius:var(--r-sm);
  background:rgba(15,22,38,0.6);
}
.menu-toggle svg{width:20px;height:20px}

/* ============================================================
   5. FOOTER
   ============================================================ */
.site-footer{
  position:relative;
  padding:var(--sp-12) 0 var(--sp-7);
  background:linear-gradient(180deg, transparent, rgba(11,17,32,0.6) 30%, rgba(5,8,16,0.92) 100%);
  border-top:1px solid var(--c-border);
  margin-top:var(--sp-14);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr repeat(3, 1fr);
  gap:var(--sp-9);
  margin-bottom:var(--sp-9);
}
.footer-brand .logo{margin-bottom:var(--sp-4);display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--c-text)}
/* footerlogofix 2026-05-26 — constrain footer SVG mark + size word like header */
.footer-brand .logo-mark{width:38px;height:38px;flex-shrink:0;filter:drop-shadow(0 0 12px rgba(0,217,255,0.18))}
.footer-brand .logo-word{font-family:var(--ff-display);font-weight:700;font-size:20px;letter-spacing:-0.02em;color:var(--c-text)}
.footer-brand p{font-size:var(--fs-sm);max-width:300px;color:var(--c-text-muted);margin-top:var(--sp-3)}
.footer-col h6{
  font-family:var(--ff-mono);
  font-size:var(--fs-xs);
  font-weight:600;
  letter-spacing:var(--tracking-wide);
  text-transform:uppercase;
  color:var(--c-text-muted);
  margin-bottom:var(--sp-5);
}
.footer-col ul{display:flex;flex-direction:column;gap:var(--sp-3)}
.footer-col a{
  font-size:var(--fs-sm);
  color:var(--c-text-body);
  transition:color var(--t-fast);
}
.footer-col a:hover{color:var(--c-cyan)}

.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:var(--sp-7);
  border-top:1px solid var(--c-border);
  font-size:var(--fs-xs);
  color:var(--c-text-muted);
}
.footer-bottom .build{
  font-family:var(--ff-mono);
  letter-spacing:var(--tracking-mono);
}
.footer-social{
  display:inline-flex;align-items:center;justify-content:center;
  color:var(--c-text-muted);
  transition:color .2s ease, transform .2s ease;
}
.footer-social:hover,
.footer-social:focus-visible{
  color:var(--c-accent, #00D9FF);
  transform:translateY(-1px);
}
.footer-social svg{display:block}

/* ============================================================
   6. FORMULAIRES
   ============================================================ */
.field{
  display:flex;flex-direction:column;gap:var(--sp-2);
  margin-bottom:var(--sp-5);
}
.field label{
  font-family:var(--ff-mono);
  font-size:var(--fs-xs);
  font-weight:500;
  color:var(--c-text-muted);
  letter-spacing:var(--tracking-wide);
  text-transform:uppercase;
}
.field input,
.field textarea,
.field select{
  width:100%;
  padding:14px 16px;
  font-size:var(--fs-base);
  color:var(--c-text);
  background:rgba(11,17,32,0.6);
  border:1px solid var(--c-border);
  border-radius:var(--r-md);
  transition:border-color var(--t-base),
             background var(--t-base),
             box-shadow var(--t-base);
}
.field input::placeholder,
.field textarea::placeholder{color:var(--c-text-faint)}
.field input:hover,
.field textarea:hover,
.field select:hover{
  border-color:rgba(199,208,224,0.18);
}
.field input:focus,
.field textarea:focus,
.field select:focus{
  border-color:var(--c-cyan);
  background:rgba(15,22,38,0.85);
  box-shadow:0 0 0 4px rgba(0,229,255,0.12);
  outline:none;
}
.field textarea{min-height:140px;resize:vertical}
.field .help{
  font-size:var(--fs-xs);
  color:var(--c-text-faint);
  margin-top:var(--sp-1);
}
.field.error input,
.field.error textarea{
  border-color:var(--c-red);
  background:rgba(255,85,119,0.04);
}
.field.error .help{color:var(--c-red)}

.checkbox-row{
  display:flex;align-items:flex-start;gap:var(--sp-3);
  font-size:var(--fs-sm);
  color:var(--c-text-body);
  cursor:pointer;
}
.checkbox-row input[type="checkbox"]{
  width:18px;height:18px;
  accent-color:var(--c-cyan);
  cursor:pointer;
  flex-shrink:0;margin-top:2px;
}
.checkbox-row a{color:var(--c-cyan);text-decoration:underline;text-underline-offset:3px}

/* Honeypot hide */
.honeypot{
  position:absolute !important;left:-9999px !important;
  width:1px;height:1px;overflow:hidden;
  visibility:hidden !important;pointer-events:none;
}

/* ============================================================
   7. TERMINAL (réutilisé dans hero + sections demo)
   ============================================================ */
.terminal{
  background:linear-gradient(180deg, rgba(15,22,38,0.92), rgba(11,17,32,0.88));
  border:1px solid var(--c-border-strong);
  border-radius:var(--r-lg);
  box-shadow:
    var(--shadow-lg),
    0 0 0 1px rgba(0,229,255,0.06),
    0 0 40px rgba(0,229,255,0.10);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  overflow:hidden;
}
.terminal-head{
  display:flex;align-items:center;gap:var(--sp-2);
  padding:10px 14px;
  border-bottom:1px solid rgba(199,208,224,0.06);
  background:rgba(255,255,255,0.02);
}
.terminal-dots{display:flex;gap:6px}
.terminal-dots span{
  width:9px;height:9px;border-radius:50%;display:inline-block;
}
.terminal-dots span:nth-child(1){background:#FF5F57}
.terminal-dots span:nth-child(2){background:#FEBC2E}
.terminal-dots span:nth-child(3){background:#28C840}
.terminal-title{
  font-family:var(--ff-mono);
  font-size:11px;
  color:var(--c-text-muted);
  margin-left:auto;
  letter-spacing:var(--tracking-mono);
}
.terminal-body{
  padding:14px 16px 16px;
  font-family:var(--ff-mono);
  font-size:12px;line-height:1.7;
  color:var(--c-text-body);
}
.terminal-body .prompt{color:var(--c-cyan)}
.terminal-body .cmd   {color:var(--c-text)}
.terminal-body .ok    {color:var(--c-green)}
.terminal-body .warn  {color:var(--c-amber)}
.terminal-body .crit  {color:var(--c-red)}
.terminal-body .mute  {color:var(--c-text-muted)}

.term-cursor{
  display:inline-block;
  width:7px;height:13px;
  background:var(--c-cyan);
  box-shadow:0 0 8px var(--c-cyan);
  vertical-align:-2px;margin-left:2px;
  animation:term-blink 1s steps(2) infinite;
}
@keyframes term-blink{50%{opacity:0}}

/* ============================================================
   8. STATS ROW
   ============================================================ */
.stats-row{
  display:flex;align-items:stretch;
  border-top:1px solid var(--c-border);
  padding-top:var(--sp-7);
  margin-top:var(--sp-4);
}
.stats-row .stat{
  flex:1;
  display:flex;flex-direction:column;gap:6px;
  padding-right:var(--sp-7);
  position:relative;
}
.stats-row .stat + .stat{
  padding-left:var(--sp-7);
  border-left:1px solid var(--c-border);
}
.stats-row .stat .num{
  font-family:var(--ff-display);
  font-weight:700;font-size:var(--fs-2xl);
  color:var(--c-text);
  letter-spacing:-0.02em;
  line-height:1;
}
.stats-row .stat .num .accent{color:var(--c-cyan)}
.stats-row .stat .label{
  font-family:var(--ff-mono);
  font-size:11px;font-weight:500;
  letter-spacing:var(--tracking-wide);
  text-transform:uppercase;
  color:var(--c-text-muted);
}

/* ============================================================
   9. SECTION HEADERS (titre + lead)
   ============================================================ */
.section-head{
  text-align:center;
  margin-bottom:var(--sp-11);
  max-width:780px;margin-left:auto;margin-right:auto;
}
.section-head .eyebrow{margin-bottom:var(--sp-4);justify-content:center}
.section-head h2{margin-bottom:var(--sp-4)}
.section-head p.lead{color:var(--c-text-body)}
.section-head.align-left{text-align:left;margin-left:0}

/* ============================================================
   10. COOKIE BANNER (réutilisé v1, adapté charte)
   ============================================================ */
.cookie-banner{
  position:fixed;bottom:24px;left:24px;right:24px;
  max-width:560px;margin:0 auto;
  z-index:var(--z-modal);
  background:linear-gradient(180deg, rgba(15,22,38,0.96), rgba(11,17,32,0.94));
  border:1px solid var(--c-border-strong);
  border-radius:var(--r-lg);
  padding:var(--sp-5);
  box-shadow:
    var(--shadow-lg),
    0 0 0 1px rgba(0,229,255,0.06),
    0 0 30px rgba(0,229,255,0.10);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  transform:translateY(0);
  transition:transform var(--t-slow), opacity var(--t-slow);
}
.cookie-banner.hidden{transform:translateY(120%);opacity:0;pointer-events:none}
.cookie-banner h6{
  font-family:var(--ff-display);
  font-size:var(--fs-md);font-weight:600;
  color:var(--c-text);margin-bottom:var(--sp-2);
}
.cookie-banner p{
  font-size:var(--fs-sm);
  color:var(--c-text-body);
  margin-bottom:var(--sp-4);
  line-height:1.5;
}
.cookie-banner .actions{
  display:flex;gap:var(--sp-2);flex-wrap:wrap;
}

/* ============================================================
   11. SKIP LINK (accessibilité)
   ============================================================ */
.skip-link{
  position:absolute;top:-100px;left:24px;
  background:var(--c-cyan);
  color:#03101A;
  padding:10px 16px;
  border-radius:var(--r-sm);
  font-weight:600;font-size:var(--fs-sm);
  z-index:var(--z-toast);
  transition:top var(--t-base);
}
.skip-link:focus{top:24px}

/* ============================================================
   12. RESPONSIVE BREAKPOINTS
   ============================================================ */
@media (max-width: 960px){
  /* Desktop nav + langue + CTA texte masqués : place au burger seul (mobilenav 2026-07-01) */
  .site-nav,.lang-switch{display:none}
  .header-actions .btn{display:none}
  .menu-toggle{display:inline-flex}

  /* Menu burger ouvert : dropdown vertical sous le header */
  .site-nav.open{
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    position:fixed;
    top:var(--header-h);left:0;right:0;
    z-index:var(--z-overlay);
    padding:var(--sp-3) clamp(20px, 4vw, 64px) var(--sp-5);
    background:rgba(5,8,16,0.98);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    border-bottom:1px solid var(--c-border);
    box-shadow:0 24px 48px rgba(0,0,0,0.5);
  }
  .site-nav.open a{
    padding:14px 4px;
    font-size:16px;
    min-height:44px;
    display:flex;align-items:center;
    border-bottom:1px solid var(--c-border);
  }
  .site-nav.open a:last-child{border-bottom:0}

  .footer-grid{
    grid-template-columns:1fr 1fr;
    gap:var(--sp-7);
  }
  .stats-row{flex-wrap:wrap;gap:var(--sp-5)}
  .stats-row .stat{
    flex:0 0 calc(50% - var(--sp-3));
    padding:0;
  }
  .stats-row .stat + .stat{border-left:0;padding-left:0}
}

@media (max-width: 600px){
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:var(--sp-3);text-align:center}
  .cookie-banner{left:12px;right:12px;bottom:12px}
}

/* Lot 3 : allègement GPU sur tactile / faibles machines (hover:none ou pointer:coarse).
   Le desktop pointeur-fin garde le rendu premium intact.
   On retire les backdrop-filter:blur (re-sampling GPU par frame de scroll) ;
   fonds opacifiés là où le fond translucide laissait passer l'aurora. */
@media (hover:none),(pointer:coarse){
  .btn-secondary{backdrop-filter:none;-webkit-backdrop-filter:none;background:rgba(15,22,38,0.92);}
  .pill{backdrop-filter:none;-webkit-backdrop-filter:none;background:rgba(15,22,38,0.92);}
  .card,.terminal,.cookie-banner{backdrop-filter:none;-webkit-backdrop-filter:none;}
  /* Header : fond quasi-opaque, plus de flou = fin du scroll-jank principal */
  .site-header{
    backdrop-filter:none;-webkit-backdrop-filter:none;
    background:linear-gradient(180deg, rgba(5,8,16,0.96), rgba(5,8,16,0.92));
  }
  /* Drop-shadows logos neutralisés (gain marginal, rendu quasi identique) */
  .site-header .logo-mark,.footer-brand .logo-mark{filter:none;}
}

/* ============================================================
   13. BACK-TO-TOP (bouton flottant — toutes pages)
   ============================================================ */
.back-to-top{
  position:fixed;
  right:clamp(16px, 3vw, 28px);
  bottom:clamp(16px, 3vw, 28px);
  z-index:60;
  width:48px;height:48px;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--c-border-strong);
  border-radius:var(--r-full);
  background:linear-gradient(135deg, var(--c-surface-2), var(--c-surface));
  color:var(--c-cyan);
  cursor:pointer;
  box-shadow:var(--shadow-md);
  opacity:0;visibility:hidden;
  transform:translateY(12px) scale(.92);
  transition:opacity .25s ease, transform .25s ease, visibility .25s, border-color .2s, box-shadow .2s;
}
.back-to-top svg{width:22px;height:22px}
.back-to-top.visible{
  opacity:1;visibility:visible;
  transform:translateY(0) scale(1);
}
.back-to-top:hover{
  border-color:var(--c-border-hover);
  color:var(--c-text-strong);
  box-shadow:0 0 0 1px rgba(0,229,255,.4), var(--shadow-lg);
  transform:translateY(-2px) scale(1.04);
}
.back-to-top:focus-visible{
  outline:2px solid var(--c-cyan);
  outline-offset:3px;
}

/* ============================================================
   14. NAV LATÉRALE DE SECTIONS (pages longues — desktop)
   ============================================================ */
.section-nav{
  position:fixed;
  right:clamp(14px, 1.6vw, 22px);
  top:50%;
  transform:translateY(-50%);
  z-index:50;
  display:flex;flex-direction:column;
  gap:14px;
  padding:6px;
}
.section-nav-dot{
  position:relative;
  display:flex;align-items:center;
  text-decoration:none;
  cursor:pointer;
}
.section-nav-dot .dot{
  width:10px;height:10px;
  border-radius:var(--r-full);
  background:var(--c-text-faint);
  border:1px solid transparent;
  transition:background .2s ease, transform .2s ease, box-shadow .2s ease;
}
.section-nav-dot:hover .dot{
  background:var(--c-cyan-soft);
  transform:scale(1.25);
}
.section-nav-dot.active .dot{
  background:var(--c-cyan);
  box-shadow:0 0 0 4px rgba(0,229,255,.16), 0 0 10px rgba(0,229,255,.4);
  transform:scale(1.2);
}
.section-nav-label{
  position:absolute;
  right:22px;
  white-space:nowrap;
  font-family:var(--ff-body);
  font-size:12px;font-weight:600;
  color:var(--c-text);
  background:var(--c-surface-2);
  border:1px solid var(--c-border);
  border-radius:8px;
  padding:5px 10px;
  box-shadow:var(--shadow-sm);
  opacity:0;visibility:hidden;
  transform:translateX(6px);
  transition:opacity .2s ease, transform .2s ease, visibility .2s;
  pointer-events:none;
}
.section-nav-dot:hover .section-nav-label,
.section-nav-dot:focus-visible .section-nav-label{
  opacity:1;visibility:visible;
  transform:translateX(0);
}
.section-nav-dot:focus-visible .dot{
  outline:2px solid var(--c-cyan);
  outline-offset:3px;
}
/* Masquée sous 1024px (mobile/tablette = pas de nav dots) */
@media (max-width: 1024px){
  .section-nav{display:none}
}
@media (prefers-reduced-motion: reduce){
  .back-to-top,
  .section-nav-dot .dot,
  .section-nav-label{transition:none}
}