/* ============================================================
   main.css — Styles partagés du site vitrine Certixio.
   Charte : ../../app.certixio.fr/graphique.md (adaptée Inter Tight).
   Chaque page charge en plus sa feuille spécifique (home.css, …).
   ============================================================ */

:root {
  --navy: #0D1B2A;
  --navy-hover: #1a2e42;
  --teal: #00C9A7;
  --teal-mid: #00A88B;
  --teal-light: #E6FAF6;
  --slate: #4A5568;
  --light: #F7F9FC;
  --border: #E2E8F0;
  --white: #ffffff;
  --contact: rgb(51, 44, 84);
  --contact-hover: rgb(35, 30, 60);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter Tight', sans-serif;
  background: var(--white);
  color: var(--navy);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3 { font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; }

/* ===== Header / nav ===== */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: 1280px; margin: 0 auto;
  padding: 0 1.5rem; height: 68px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo { font-size: 22px; font-weight: 700; letter-spacing: -0.03em; }
.logo .accent { color: var(--teal); }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--navy); transition: color 0.15s; }
.nav-links a:hover { color: var(--teal-mid); }
.nav-links a[aria-current="page"] { color: var(--teal-mid); }

/* ===== Boutons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 500; border-radius: 8px;
  padding: 10px 18px; border: 0.5px solid transparent;
  transition: all 0.15s; white-space: nowrap;
}
.btn-primary { background: var(--navy); color: #fff; }
.btn-primary:hover { background: var(--navy-hover); }
.btn-teal { background: var(--teal); color: var(--navy); font-weight: 600; }
.btn-teal:hover { background: var(--teal-mid); color: #fff; }
.btn-ghost { background: #fff; color: var(--navy); border: 0.5px solid var(--border); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-mid); }
.btn-contact { background: var(--contact); color: #fff; }
.btn-contact:hover { background: var(--contact-hover); }
.menu-toggle { display: none; background: none; border: none; font-size: 22px; color: var(--navy); }

/* ===== Layout de section ===== */
section { max-width: 1280px; margin: 0 auto; padding: 5rem 1.5rem; }
.eyebrow {
  font-size: 12px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--teal-mid); margin-bottom: 14px;
}
.section-title { font-size: 34px; max-width: 780px; }
.section-intro { font-size: 18px; color: var(--slate); max-width: 720px; margin-top: 16px; font-weight: 300; }

/* ===== Bandeau logos ===== */
.logos-band { background: var(--light); max-width: none; padding: 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.logos-inner { max-width: 1280px; margin: 0 auto; padding: 2.5rem 1.5rem; }
.logos-label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--slate); text-align: center; margin-bottom: 22px; font-weight: 500; }
.logos-track { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 14px 28px; }
.logo-chip { font-size: 14px; font-weight: 500; color: var(--slate); padding: 8px 16px; border: 0.5px solid var(--border); border-radius: 8px; background: #fff; }

/* ===== Bandeau CTA ===== */
.cta-band { background: var(--teal-light); max-width: none; padding: 0; }
.cta-inner { max-width: 1280px; margin: 0 auto; padding: 4rem 1.5rem; text-align: center; }
.cta-inner h2 { font-size: 30px; max-width: 640px; margin: 0 auto 16px; }
.cta-inner p { font-size: 17px; color: var(--slate); max-width: 560px; margin: 0 auto 30px; font-weight: 300; }
.cta-inner .btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
footer.site { background: var(--navy); color: #C7D0DB; }
.footer-inner { max-width: 1280px; margin: 0 auto; padding: 4rem 1.5rem 2.5rem; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; }
.footer-inner .logo { color: #fff; margin-bottom: 16px; }
.footer-inner p { font-size: 14px; font-weight: 300; max-width: 260px; }
.footer-col h4 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: #fff; margin-bottom: 16px; font-weight: 600; }
.footer-col a { display: block; font-size: 14px; margin-bottom: 10px; color: #C7D0DB; font-weight: 300; transition: color 0.15s; }
.footer-col a:hover { color: var(--teal); }
.footer-bottom { max-width: 1280px; margin: 0 auto; padding: 1.5rem; border-top: 1px solid rgba(255, 255, 255, 0.12); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 13px; color: #8A96A5; }

/* ===== Responsive de base ===== */
@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .section-title { font-size: 28px; }
}
@media (max-width: 768px) {
  .nav-links {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border); padding: 8px 1.5rem 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; }
  .menu-toggle { display: block; }
  section { padding: 3.5rem 1.25rem; }
}
@media (max-width: 560px) {
  .footer-inner { grid-template-columns: 1fr; }
}