/* =========================================================
   SITE.CSS — chrome partagé pour toutes les pages Umwelten
   (nav, boutons, container, label, footer, reveal, base)
   Source canonique : extraite de scan.html (commentaire
   "SHARED CHROME — identical to landing / manifeste / offres").
   Variantes plus simples des autres pages alignées dessus.
   ========================================================= */

/* ---------- Base ---------- */
html { scroll-behavior: smooth; }
body { background: var(--papier); color: var(--encre); overflow-x: hidden; }
::selection { background: var(--ambre); color: var(--papier); }

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: var(--ambre); z-index: 100;
  transition: width 80ms linear;
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--papier) 92%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--sable);
}
.nav__inner {
  max-width: 1360px; margin-inline: auto;
  padding: 18px 40px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand {
  display: inline-block; color: var(--encre); text-decoration: none;
  line-height: 1; width: 180px; height: 28px;
  transition: width 180ms var(--ease-out);
}
.brand-svg { display: block; width: 100%; height: 100%; overflow: visible; }
.brand-svg text { font-family: "Space Grotesk", sans-serif; }
.nav__menu { display: flex; align-items: center; gap: 36px; }
.nav__menu a {
  font-family: var(--font-sans); font-weight: 500;
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--encre); text-decoration: none;
  transition: color 200ms var(--ease-out);
  padding: 8px 0; position: relative;
}
.nav__menu a:not(.btn)::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 2px;
  height: 1px; background: var(--ambre);
  transform-origin: right center; transform: scaleX(0);
  transition: transform 360ms var(--ease-out);
}
.nav__menu a:not(.btn):hover::after { transform-origin: left center; transform: scaleX(1); }
.nav__menu a:hover { color: var(--ambre); }
.nav__menu a.current { color: var(--ambre); }
.nav__menu a.current::after { transform-origin: left center; transform: scaleX(1); }
.nav__menu a.btn--primary { color: var(--papier); padding: 10px 18px; font-size: 11px; letter-spacing: 0.14em; }
.nav__menu a.btn--primary:hover { color: var(--papier); }
.nav__burger {
  display: none; width: 40px; height: 40px;
  border: 1px solid var(--sable); background: transparent;
  border-radius: 2px; cursor: pointer; padding: 0; position: relative;
}
.nav__burger span { position: absolute; left: 10px; right: 10px; height: 1px; background: var(--encre); }
.nav__burger span:nth-child(1) { top: 14px; }
.nav__burger span:nth-child(2) { top: 24px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 28px;
  font-family: var(--font-sans); font-weight: 500;
  font-size: 13px; letter-spacing: 0.04em;
  border-radius: 2px; border: 1px solid transparent;
  cursor: pointer; text-decoration: none;
  transition: background 200ms var(--ease-out), color 200ms var(--ease-out), border-color 200ms var(--ease-out), transform 200ms var(--ease-out);
}
.btn--primary { background: var(--encre); color: var(--papier); position: relative; overflow: hidden; isolation: isolate; }
.btn--primary::before {
  content: ""; position: absolute; inset: 0;
  background: var(--ambre); transform: translateY(101%);
  transition: transform 400ms var(--ease-out); z-index: -1;
}
.btn--primary:hover::before { transform: translateY(0); }
.btn--primary:hover { transform: translateY(-2px); }
.btn--primary .arr { display: inline-block; transition: transform 300ms var(--ease-out); }
.btn--primary:hover .arr { transform: translateX(4px); }
.btn--secondary { background: transparent; color: var(--encre); border-color: var(--encre); }
.btn--secondary:hover { background: var(--encre); color: var(--papier); transform: translateY(-2px); }
.btn--secondary .arr { display: inline-block; transition: transform 300ms var(--ease-out); }
.btn--secondary:hover .arr { transform: translateX(4px); }
.btn--large { padding: 18px 36px; font-size: 14px; }
.btn--ghost {
  padding: 0; color: var(--encre-bleue); background: transparent; border: 0;
  text-decoration: underline; text-underline-offset: 5px; text-decoration-thickness: 1px;
  font-size: 14px; letter-spacing: 0;
}
.btn--ghost:hover { color: var(--ambre); }

/* ---------- Layout primitives ---------- */
.container { max-width: 1200px; margin-inline: auto; padding-inline: 40px; }
.container--narrow { max-width: 880px; }

.label {
  display: inline-block;
  font-family: var(--font-sans); font-weight: 500;
  font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--pierre);
}
.label--accent { color: var(--ambre); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--sable); padding: 40px 0 48px; }
.footer__row { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; flex-wrap: wrap; }
.footer__row--top { padding-bottom: 24px; }
.footer__brand {
  font-family: var(--font-serif); font-style: italic;
  font-size: 20px; color: var(--encre);
  text-decoration: none;
  display: inline-flex; align-items: baseline;
}
.footer__brand .dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--ambre); margin-left: 3px;
  display: inline-block; transform: translateY(-1px);
}
.footer__menu {
  font-family: var(--font-sans); font-weight: 500;
  font-size: 12px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--pierre);
}
.footer__menu a { color: var(--pierre); text-decoration: none; transition: color 200ms var(--ease-out); }
.footer__menu a:hover { color: var(--ambre); }
.footer__menu .sep { margin: 0 12px; color: var(--sable); }
.footer__row--bottom {
  padding-top: 24px; border-top: 1px solid var(--sable);
  font-family: var(--font-sans); font-weight: 400;
  font-size: 12px; color: var(--pierre);
}

/* ---------- Reveal ---------- */
.reveal {
  opacity: 0; transform: translateY(10px);
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
}
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-delay="1"].is-in { transition-delay: 80ms; }
.reveal[data-delay="2"].is-in { transition-delay: 160ms; }
.reveal[data-delay="3"].is-in { transition-delay: 240ms; }
.reveal[data-delay="4"].is-in { transition-delay: 320ms; }
.reveal[data-delay="5"].is-in { transition-delay: 400ms; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive chrome ---------- */
@media (max-width: 860px) {
  .brand { width: 140px; height: 24px; }
}
@media (max-width: 640px) {
  .container { padding-inline: 24px; }
  .nav__inner { padding: 16px 24px; }
  .nav__menu { display: none; }
  .nav__burger { display: block; }
  .footer__row { flex-direction: column; align-items: flex-start; gap: 12px; }
}