/* ============================================================================
   OPAQ — socle v1.0 — base.css
   ----------------------------------------------------------------------------
   Fondations communes à tous les sites : reset, typographie, conteneur, grille,
   navigation, boutons, cartes, formulaires, apparitions, accessibilité.
   Ce fichier ne porte AUCUNE décision esthétique : tout passe par tokens.css.
   Un site ajoute son propre style.css APRÈS (composants métier, sections).
   ============================================================================ */

/* --- Reset minimal ------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--nav-height) + 1rem); }
html:focus-within { scroll-behavior: smooth; }
body {
  font-family: var(--font-text);
  font-size: var(--text-base);
  line-height: var(--lh-text);
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
}
img, picture, video, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }

/* --- Typographie ---------------------------------------------------------- */
h1, h2, h3, h4, .display {
  font-family: var(--font-display);
  line-height: var(--lh-display);
  letter-spacing: var(--tracking-display);
  font-weight: 600;
  text-wrap: balance;
}
h1, .h1 { font-size: var(--step-4); }
h2, .h2 { font-size: var(--step-3); }
h3, .h3 { font-size: var(--step-2); }
h4, .h4 { font-size: var(--step-1); }
.display { font-size: var(--step-5); }
p, li { max-width: 65ch; text-wrap: pretty; }
.lead { font-size: calc(var(--text-base) * 1.2); color: var(--color-muted); }
.muted { color: var(--color-muted); }
.label {
  font-size: 0.78rem; font-weight: 600; letter-spacing: var(--tracking-label);
  text-transform: uppercase; color: var(--color-muted);
}
.label--accent { color: var(--color-accent); }

/* --- Conteneur, sections, grilles ---------------------------------------- */
.container { width: min(100% - 2 * var(--gutter), var(--container)); margin-inline: auto; }
.container--narrow { --container: 800px; }
.section { padding-block: var(--section-y); }
.section--tight { padding-block: calc(var(--section-y) * 0.6); }
.section--dark { background: var(--color-dark); color: var(--color-dark-ink); }
.section--dark .muted, .section--dark .label { color: color-mix(in srgb, var(--color-dark-ink) 70%, transparent); }
.section__head { margin-bottom: var(--space-5); }
.section__head > * + * { margin-top: var(--space-2); }
.grid { display: grid; gap: var(--space-4); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr)); }
.split { display: grid; gap: var(--space-5); align-items: center; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .split--reverse > :first-child { order: 2; } }
.grid > *, .split > * { min-width: 0; }
.stack > * + * { margin-top: var(--space-3); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }

/* --- Navigation ----------------------------------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-height);
  display: flex; align-items: center;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast), background var(--dur-fast);
}
.nav.is-scrolled { border-bottom-color: var(--color-line); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
.nav__brand { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; text-decoration: none; letter-spacing: -0.01em; }
.nav__brand img { height: 36px; width: auto; }
.nav__links { display: flex; gap: var(--space-4); align-items: center; }
.nav__links a { text-decoration: none; font-weight: 500; opacity: 0.85; }
.nav__links a:hover, .nav__links a[aria-current="page"] { opacity: 1; }
.nav__toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; border-radius: var(--radius-sm); }
.nav__toggle span { display: block; width: 22px; height: 2px; background: currentColor; position: relative; }
.nav__toggle span::before, .nav__toggle span::after { content: ''; position: absolute; left: 0; width: 22px; height: 2px; background: currentColor; transition: transform var(--dur-fast); }
.nav__toggle span::before { top: -7px; } .nav__toggle span::after { top: 7px; }
@media (max-width: 899px) {
  .nav__toggle { display: inline-flex; }
  .nav__links {
    position: fixed; inset: var(--nav-height) 0 auto 0;
    flex-direction: column; align-items: flex-start; gap: var(--space-3);
    padding: var(--space-4) var(--gutter) var(--space-5);
    background: var(--color-bg); border-bottom: 1px solid var(--color-line);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity var(--dur-fast), transform var(--dur-fast);
  }
  .nav.is-open .nav__links { transform: none; opacity: 1; pointer-events: auto; }
  .nav.is-open .nav__toggle span { background: transparent; }
  .nav.is-open .nav__toggle span::before { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav__toggle span::after { transform: translateY(-7px) rotate(-45deg); }
}

/* --- Boutons ---------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5em;
  padding: 0.85em 1.6em; border-radius: var(--radius-pill);
  font-weight: 600; text-decoration: none; line-height: 1;
  background: var(--color-accent); color: var(--color-accent-ink);
  border: 1px solid var(--color-accent);
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast), background var(--dur-fast);
}
.btn:hover { transform: translateY(-1px); opacity: 0.92; }
.btn:active { transform: translateY(0); }
.btn--ghost { background: transparent; color: inherit; border-color: var(--color-line); }
.btn--ghost:hover { border-color: currentColor; opacity: 1; }
.btn--small { padding: 0.6em 1.1em; font-size: 0.9rem; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }

/* --- Cartes ----------------------------------------------------------------- */
.card {
  background: var(--color-surface); border: 1px solid var(--color-line);
  border-radius: var(--radius); padding: var(--space-4);
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card > * + * { margin-top: var(--space-2); }
.card__media { border-radius: calc(var(--radius) - 4px); overflow: hidden; aspect-ratio: 4 / 3; margin: calc(-1 * var(--space-4)) calc(-1 * var(--space-4)) var(--space-3); }
.card__media img { width: 100%; height: 100%; object-fit: cover; }

/* --- Hero ------------------------------------------------------------------- */
.hero { padding-block: clamp(var(--space-6), 12vw, var(--space-8)); }
.hero__inner > * + * { margin-top: var(--space-3); }
.hero__actions { margin-top: var(--space-4); }
.hero--cover { position: relative; min-height: min(88dvh, 820px); display: grid; align-items: end; color: var(--color-dark-ink); isolation: isolate; }
.hero--cover img.hero__bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -2; }
.hero--cover::after { content: ''; position: absolute; inset: 0; z-index: -1; background: linear-gradient(to top, rgba(0,0,0,0.72), rgba(0,0,0,0.15) 60%, rgba(0,0,0,0.1)); }

/* --- Chiffres clés, témoignages, FAQ (composants fréquents) ---------------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); gap: var(--space-4); border-block: 1px solid var(--color-line); padding-block: var(--space-4); }
.stat__value { font-family: var(--font-display); font-size: var(--step-3); line-height: 1; font-weight: 600; }
.quote { font-family: var(--font-display); font-size: var(--step-2); line-height: 1.3; font-weight: 400; }
.quote__by { margin-top: var(--space-2); font-size: 0.9rem; color: var(--color-muted); }
.faq details { border-top: 1px solid var(--color-line); padding: var(--space-2) 0; }
.faq details:last-child { border-bottom: 1px solid var(--color-line); }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1rem; padding-block: 0.4rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-weight: 400; }
.faq details[open] summary::after { content: '–'; }

/* --- Formulaires -------------------------------------------------------------- */
.form { display: grid; gap: var(--space-3); }
.form__row { display: grid; gap: var(--space-3); grid-template-columns: 1fr; }
@media (min-width: 640px) { .form__row { grid-template-columns: 1fr 1fr; } }
.field { display: grid; gap: 0.4rem; }
.field label { font-weight: 600; font-size: 0.92rem; }
.field input, .field textarea, .field select {
  width: 100%; padding: 0.8em 1em; border-radius: var(--radius-sm);
  border: 1px solid var(--color-line); background: var(--color-surface);
}
.field input:focus-visible, .field textarea:focus-visible, .field select:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 1px; border-color: transparent; }
.field textarea { min-height: 8rem; resize: vertical; }
.form__hint { font-size: 0.85rem; color: var(--color-muted); }
.form__status { padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm); font-weight: 500; }
.form__status--ok { background: color-mix(in srgb, var(--color-success) 12%, transparent); color: var(--color-success); }
.form__status--error { background: color-mix(in srgb, var(--color-error) 12%, transparent); color: var(--color-error); }
.form .btn { justify-self: start; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; } /* honeypot */

/* --- Pied de page ----------------------------------------------------------------- */
.footer { border-top: 1px solid var(--color-line); padding-block: var(--space-6) var(--space-4); font-size: 0.95rem; }
.footer__grid { display: grid; gap: var(--space-5); grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr)); }
.footer__bottom { margin-top: var(--space-5); padding-top: var(--space-3); border-top: 1px solid var(--color-line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-2); color: var(--color-muted); font-size: 0.85rem; }
.footer a { text-decoration: none; }
.footer__grid strong, .footer__grid .stack > a { display: block; }
.footer__grid .stack > * + * { margin-top: var(--space-1); }
.footer a:hover { text-decoration: underline; }

/* --- Apparitions au défilement ----------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(var(--reveal-y)); transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.1s; } .reveal[data-delay="2"] { transition-delay: 0.2s; } .reveal[data-delay="3"] { transition-delay: 0.3s; }
.no-js .reveal { opacity: 1; transform: none; }

/* --- Accessibilité & utilitaires ----------------------------------------------------- */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 1rem; top: -100%; z-index: 100; padding: 0.6em 1em; background: var(--color-ink); color: var(--color-bg); border-radius: var(--radius-sm); }
.skip-link:focus { top: 1rem; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }
.text-center { text-align: center; }
.mt-2 { margin-top: var(--space-2); } .mt-4 { margin-top: var(--space-4); } .mt-6 { margin-top: var(--space-6); }

@media (prefers-reduced-motion: reduce) {
  html:focus-within { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}
@media print {
  .nav, .footer, .btn, .skip-link { display: none !important; }
  body { background: #fff; color: #000; }
}