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

:root {
  --blue-dark: #1a3a5c;
  --blue-mid: #2563a8;
  --blue-light: #dbeafe;
  --blue-pale: #f0f6ff;
  --eco-green: #4CAF50;
  --eco-pale: #e8f5e9;
  --gray-dark: #2d2d2d;
  --gray-mid: #6b7280;
  --gray-light: #e5e7eb;
  --gray-pale: #f9fafb;
  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(26,58,92,0.08);
  --transition: all 0.3s ease;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--gray-dark);
  background-color: var(--gray-pale);
  line-height: 1.6;
  overflow-x: hidden;
}

/* CONTENEUR IMAGES */
.img-container {
  position: relative;
  display: inline-block;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--blue-pale);
}

/* CARROUSELS */
.carousel-container { position: relative; width: 100%; height: 250px; overflow: hidden; }
.carousel-track { display: flex; height: 100%; transition: transform 0.4s ease-in-out; }
.carousel-slide {
  flex: 0 0 100%; 
  width: 100%; height: 100%;
  background-color: var(--gray-dark);
  display: flex; justify-content: center; align-items: center;
}
.carousel-slide img { width: 100%; height: 100%; object-fit: cover; cursor: zoom-in; }
.carousel-slide video { width: 100%; height: 100%; object-fit: contain; background-color: var(--gray-dark); cursor: pointer; }
.carousel-btn {
  position: absolute; top: 50%; transform: translateY(-50%); background: rgba(26,58,92,0.8);
  color: var(--white); border: none; width: 32px; height: 32px; border-radius: 50%;
  cursor: pointer; z-index: 5; font-size: 16px; display: flex; align-items: center; justify-content: center; transition: var(--transition);
}
.carousel-btn:hover { background: var(--blue-dark); }
.carousel-btn.prev { left: 10px; }
.carousel-btn.next { right: 10px; }

/* LIGHTBOX (ZOOM PLEIN ECRAN) */
.lightbox {
  display: none; position: fixed; z-index: 2000; top: 0; left: 0; width: 100%; height: 100%;
  background-color: rgba(0,0,0,0.95); align-items: center; justify-content: center;
}
.lightbox-content { max-width: 90%; max-height: 90vh; box-shadow: 0 0 30px rgba(0,0,0,0.5); border-radius: var(--radius-sm); user-select: none; }
.lightbox-close { position: absolute; top: 20px; right: 30px; color: white; font-size: 40px; font-weight: bold; cursor: pointer; transition: var(--transition); z-index: 2010; }
.lightbox-close:hover { color: var(--gray-light); }
.lightbox-btn {
  position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.1);
  color: var(--white); border: none; width: 50px; height: 50px; border-radius: 50%; cursor: pointer; z-index: 2010; font-size: 24px; display: flex; align-items: center; justify-content: center; transition: var(--transition);
}
.lightbox-btn:hover { background: rgba(255,255,255,0.3); }
.lightbox-btn.prev { left: 30px; }
.lightbox-btn.next { right: 30px; }

/* HEADER & LOGO */
header { background-color: var(--white); box-shadow: var(--shadow); position: fixed; top: 0; width: 100%; z-index: 1000; }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 15px 20px; display: flex; justify-content: space-between; align-items: center; }
.logo-box { display: flex; align-items: center; text-decoration: none; gap: 12px; }
.logo-img { height: 45px; width: auto; object-fit: contain; }
.logo-text { font-family: 'Montserrat', sans-serif; font-size: 24px; font-weight: 700; color: var(--blue-dark); letter-spacing: -0.5px; }

.nav-links { display: flex; gap: 30px; list-style: none; }
.nav-links a.tab-btn {
  display: inline-block; text-decoration: none; background: none; border: none;
  font-family: 'Inter', sans-serif; font-size: 16px; font-weight: 500; color: var(--gray-mid);
  cursor: pointer; padding: 8px 16px; border-radius: var(--radius-sm); transition: var(--transition);
}
.nav-links a.tab-btn:hover, .nav-links a.tab-btn.active { color: var(--blue-mid); background-color: var(--blue-pale); }

/* SYSTEME PAGES */
.tab-content { padding-top: 100px; animation: fadeIn 0.4s ease forwards; display: none; }
.tab-content.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* TYPOGRAPHIE GLOBALE */
.container { max-width: 1200px; margin: 0 auto; padding: 40px 20px; }
h1, h2, h3 { font-family: 'Montserrat', sans-serif; color: var(--blue-dark); }
h1 { font-size: 38px; line-height: 1.2; margin-bottom: 20px; font-weight: 700; letter-spacing: -0.5px; }
h2 { font-size: 32px; text-align: center; margin-bottom: 40px; font-weight: 700; letter-spacing: -0.5px; }
.slogan { font-size: 22px; font-weight: 600; color: var(--blue-mid); margin-top: 15px; margin-bottom: 5px; font-style: italic; }
.valeurs-sub { font-size: 18px; font-weight: 600; color: var(--blue-dark); letter-spacing: 1px; margin-bottom: 20px; text-transform: uppercase; }

/* ACCUEIL HERO */
.hero { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 30px; padding: 20px 0 60px 0; }
.hero-text { width: 100%; max-width: 800px; }
.hero-image { width: 100%; max-width: 800px; border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.hero-image img { width: 100%; display: block; }

.btn {
  display: inline-block; background-color: var(--blue-mid); color: var(--white); padding: 14px 28px;
  border-radius: var(--radius-sm); text-decoration: none; font-weight: 500; border: none; cursor: pointer;
  transition: var(--transition); box-shadow: 0 4px 14px rgba(37,99,168,0.3); font-family: 'Inter', sans-serif; font-size: 16px;
}
.btn:hover:not(:disabled) { background-color: var(--blue-dark); transform: translateY(-2px); }
.btn:disabled { background-color: var(--gray-mid); cursor: not-allowed; opacity: 0.7; box-shadow: none; }

.btn-secondary {
  display: inline-block; background-color: transparent; color: var(--blue-mid); padding: 12px 26px;
  border-radius: var(--radius-sm); text-decoration: none; font-weight: 500; border: 2px solid var(--blue-mid);
  cursor: pointer; transition: var(--transition); font-family: 'Inter', sans-serif; font-size: 16px; margin-left: 15px;
}
.btn-secondary:hover { background-color: var(--blue-pale); color: var(--blue-dark); border-color: var(--blue-dark); }

/* SECTION 3 ECO */
.eco-section { background-color: var(--white); padding: 60px 0; border-top: 1px solid var(--gray-light); border-bottom: 1px solid var(--gray-light); }
.eco-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 40px; margin-top: 40px; }
.eco-card { text-align: center; padding: 20px; }
.eco-icon-bubble { width: 90px; height: 90px; margin: 0 auto 20px; border: 3px solid var(--eco-green); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 36px; color: var(--eco-green); background-color: var(--eco-pale); }
.eco-card h3 { font-size: 22px; margin-bottom: 15px; color: var(--blue-dark); }
.eco-card h3 .eco-prefix { text-transform: uppercase; }
.eco-card p { font-size: 15px; color: var(--gray-mid); text-align: justify; }

/* MOTIVATION SECTION */
.motivation-block { background-color: var(--blue-pale); padding: 50px 40px; margin: 60px auto; border-radius: var(--radius); border-left: 6px solid var(--blue-mid); max-width: 1000px; }
.motivation-block h3 { font-size: 24px; margin-bottom: 20px; }

/* SERVICES GRID INTERACTIF */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.service-card { background: var(--white); padding: 30px; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--gray-light); transition: var(--transition); cursor: pointer; text-align: left; }
.service-card:hover { transform: translateY(-5px); border-color: var(--blue-mid); box-shadow: 0 8px 30px rgba(37,99,168,0.12); }
.service-card h3 { margin-bottom: 15px; font-size: 20px; transition: var(--transition); }
.service-card:hover h3 { color: var(--blue-mid); }
.service-link-hint { display: inline-block; margin-top: 15px; font-size: 14px; font-weight: 500; color: var(--blue-mid); transition: var(--transition); }
.service-card:hover .service-link-hint { color: var(--blue-dark); text-decoration: underline; }

/* CTA BANNER */
.cta-banner { background-color: var(--blue-dark); color: var(--white); text-align: center; padding: 60px 20px; border-radius: var(--radius); margin-top: 60px; }
.cta-banner h2 { color: var(--white); margin-bottom: 15px; }
.cta-banner p { margin-bottom: 30px; font-size: 18px; opacity: 0.9; }

/* REALISATIONS GRID */
.gallery-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 30px; }
.gallery-item { background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--gray-light); }
.gallery-info { padding: 20px; }
.gallery-info .tag { display: inline-block; background: var(--blue-pale); color: var(--blue-mid); padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 10px; }
.gallery-info h3 { font-size: 18px; margin-bottom: 8px; line-height: 1.3; color: var(--blue-dark); font-weight: 700; }
.gallery-info p { color: var(--gray-mid); font-size: 14px; line-height: 1.5; }

/* CONTACT SECTION */
.contact-layout { display: grid; grid-template-columns: 1fr 1.5fr; gap: 50px; background: var(--white); padding: 40px; border-radius: var(--radius); box-shadow: var(--shadow); }
.contact-info h3 { margin-bottom: 20px; font-size: 24px; }
.contact-info p { margin-bottom: 25px; color: var(--gray-mid); }
.info-block { margin-bottom: 20px; }
.info-block strong { display: block; color: var(--blue-dark); font-size: 14px; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.info-block span { color: var(--gray-dark); font-size: 16px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; font-size: 14px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 12px; border: 1px solid var(--gray-mid); border-radius: var(--radius-sm); font-family: inherit; font-size: 15px; transition: var(--transition); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--blue-mid); outline: none; box-shadow: 0 0 0 3px var(--blue-light); }
.form-success { display: none; text-align: center; padding: 30px; background-color: var(--blue-pale); border-radius: var(--radius); border: 1px solid var(--blue-light); }

/* FOOTER */
footer { background-color: var(--blue-dark); color: var(--white); text-align: center; padding: 40px 20px; margin-top: 60px; }
footer p { font-size: 14px; opacity: 0.8; margin-bottom: 8px; }
.footer-insurance { display: inline-block; margin-top: 15px; padding: 10px 20px; background-color: rgba(255, 255, 255, 0.1); border-radius: var(--radius-sm); font-weight: 500; color: var(--blue-light); }

/* RESPONSIVE */
@media (max-width: 900px) {
  .contact-layout { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .hero { padding: 30px 0; }
  .nav-links { display: none; width: 100%; flex-direction: column; background: var(--white); position: absolute; top: 75px; left: 0; padding: 20px; box-shadow: var(--shadow); gap: 15px; }
  .nav-links.open { display: flex; }
  .burger { display: flex; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 10px; }
  .burger span { width: 25px; height: 3px; background-color: var(--blue-dark); border-radius: 2px; }
  h1 { font-size: 28px; }
  .btn-secondary { margin-left: 0; margin-top: 10px; display: block; width: 100%; }
  .motivation-block { padding: 30px 20px; margin: 40px 20px; }
  
  .lightbox-btn.prev { left: 10px; }
  .lightbox-btn.next { right: 10px; }
  .lightbox-close { top: 10px; right: 20px; }
}