:root {
  --blue: #007aff;
  --gray-bg: #f9f9f9;
  --gray-text: #555;
  --radius: 16px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Inter', Arial, sans-serif;
  background: #fff;
  color: #111;
  line-height: 1.6;
}

/* HEADER */
.header {
  background: url("Vertuel image fond.png") center/cover no-repeat;
  text-align: center;
  position: relative;
  padding: 140px 20px;
}
.header::before {
  content:"";
  position:absolute; inset:0;
  background: rgba(0,0,0,0.35);
}
.header .overlay {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 20px 40px;
  background: rgba(255,255,255,0.75); /* bandeau clair */
  border-radius: 12px;
}
.header .logo {
  max-width: 280px;
  margin: 0 auto 10px;
  display: block;
}
.header h1 {
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 700;
  color: #111;
}
.cta-row {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.btn {
  display: inline-block;
  padding: 14px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: all 0.2s ease-in-out;
}
.btn.primary {
  background: var(--blue);
  color: #fff;
}
.btn.secondary {
  background: #fff;
  color: var(--blue);
}
.btn.small {
  font-size: 14px;
  padding: 10px 16px;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(0,0,0,0.15);
}

/* Sections */
.section {
  padding: 60px 20px;
  max-width: 1000px;
  margin: auto;
  text-align: center;
}
.section h2 {
  font-size: 28px;
  margin-bottom: 30px;
}
.cards {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  background: var(--gray-bg);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}
.card h3 {
  margin-bottom: 12px;
  font-size: 20px;
}
.card p {
  color: var(--gray-text);
}

/* Footer */
.footer {
  background: #f2f2f7;
  text-align: center;
  padding: 24px 20px;
  font-size: 14px;
  color: var(--gray-text);
  border-top: 1px solid #e5e5ea;
}
.footer .small {
  font-size: 12px;
  margin-top: 6px;
}