/* ============================================================================
   Open Projets Chantiers - Vitrine · socle (reset, typo, layout, chrome)
   Styles dérivés de la marque. Le rendu produit vit dans app-ui.css.
   ============================================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

body {
  font-family: var(--font-body);
  color: var(--color-dark);
  background: var(--color-gray-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 600; line-height: 1.08; color: var(--color-dark); letter-spacing: -0.02em; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
::selection { background: var(--color-primary); color: #fff; }

/* - Layout container - */
.wrap { width: 100%; max-width: var(--max-w-container); margin: 0 auto; padding-inline: 32px; }
@media (max-width: 720px) { .wrap { padding-inline: 20px; } }

.section { position: relative; padding-block: 108px; }
.section--tight { padding-block: 80px; }
@media (max-width: 720px) { .section { padding-block: 68px; } }

/* Eyebrow supprimé volontairement : titres pleins, phrases entières. */

/* - Typo d'échelle (compacte & aérée) - */
.display {
  font-size: clamp(2.2rem, 4.2vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.028em;
  font-weight: 600;
}
.h2 { font-size: clamp(1.55rem, 2.4vw, 2.05rem); line-height: 1.14; letter-spacing: -0.02em; }
.h3 { font-size: clamp(1.18rem, 1.7vw, 1.4rem); }
.lead { font-size: clamp(1rem, 1.05vw, 1.1rem); color: var(--color-gray-text); line-height: 1.65; }
.prose { font-size: 1rem; color: var(--color-gray-text); line-height: 1.72; }
.prose strong { color: var(--color-dark); font-weight: 600; }
.measure { max-width: 46ch; }
.measure-wide { max-width: 62ch; }

/* - Boutons - */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-body); font-weight: 500; font-size: .94rem;
  padding: 11px 21px; border-radius: 999px;
  transition: transform .25s cubic-bezier(.2,.8,.2,1), box-shadow .25s, background-color .2s, color .2s;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn--primary { background: var(--color-primary); color: #fff; box-shadow: 0 8px 22px -10px rgba(255,0,55,.55); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 32px -12px rgba(255,0,55,.6); }
.btn--ghost { background: #fff; color: var(--color-dark); box-shadow: inset 0 0 0 1px var(--color-gray-border); }
.btn--ghost:hover { transform: translateY(-2px); box-shadow: inset 0 0 0 1px rgba(0,0,0,.14), 0 10px 26px -16px rgba(0,0,0,.3); }
.btn--dark { background: var(--color-dark); color: #fff; }
.btn--dark:hover { transform: translateY(-2px); box-shadow: 0 14px 32px -16px rgba(0,0,0,.5); }
.btn--lg { padding: 13px 25px; font-size: .98rem; }

/* - Header / nav - */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 60;
  transition: background-color .3s, box-shadow .3s, backdrop-filter .3s;
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.nav.is-stuck { background: rgba(255,255,255,.78); backdrop-filter: saturate(180%) blur(18px); -webkit-backdrop-filter: saturate(180%) blur(18px); box-shadow: 0 1px 0 var(--color-gray-border); }
.brand { display: flex; align-items: center; }
.brand__logo { height: 40px; width: auto; display: block; }
@media (max-width: 460px) { .brand__logo { height: 34px; } }
.nav__links { display: flex; align-items: center; gap: 4px; }
.nav__link { padding: 9px 15px; border-radius: 10px; font-size: .95rem; font-weight: 500; color: var(--color-gray-text); transition: color .2s, background-color .2s; }
.nav__link:hover { color: var(--color-dark); background: rgba(0,0,0,.04); }
.nav__login { color: var(--color-dark); box-shadow: inset 0 0 0 1px var(--color-gray-border); }
.nav__login:hover { background: #fff; box-shadow: inset 0 0 0 1px rgba(0,0,0,.16); }
.nav__cta { margin-left: 8px; }
@media (max-width: 900px) { .nav__links .nav__link:not(.nav__login) { display: none; } }
@media (max-width: 460px) { .nav__login { display: none; } }
@media (max-width: 640px) { .nav__cta { display: none; } }

/* - Blobs helpers - */
.blob { position: absolute; border-radius: 50%; filter: blur(8px); pointer-events: none; z-index: 0; }

/* - Reveal on scroll (progressive enhancement : masqué seulement si JS actif) - */
.reveal { transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.js .reveal:not(.is-in) { opacity: 0; transform: translateY(28px); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }

/* - Grilles - */
.grid { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 960px) { .grid-3 { grid-template-columns: 1fr; } .grid-2 { grid-template-columns: 1fr; } }

/* - Cartes de contenu (marque, pas produit) - */
.card {
  background: #fff; border-radius: var(--radius-card); padding: 28px;
  box-shadow: var(--shadow-soft); border: 1px solid var(--color-gray-border);
}

/* - Split (texte + visuel) - */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 64px; align-items: center; }
.split > * { min-width: 0; }
.split--reverse .split__media { order: -1; }
@media (max-width: 980px) { .split { grid-template-columns: minmax(0, 1fr); gap: 40px; } .split--reverse .split__media { order: 0; } }

/* - Footer - */
.footer { background: var(--color-dark); color: rgba(255,255,255,.7); padding-block: 72px 40px; }
.footer a { color: rgba(255,255,255,.7); transition: color .2s; }
.footer a:hover { color: #fff; }
.footer h4 { color: #fff; font-size: .95rem; margin-bottom: 16px; font-family: var(--font-body); font-weight: 600; letter-spacing: 0; }