body {
      margin: 0;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: #fff;
      background: #001832;
      overflow-x: hidden;
    }

    /* Navbar de base */
nav {
  background:#001030;
  color:#fff;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:10px 20px;
  position:relative;
}

nav .logo {
  font-size:1.5rem;
  font-weight:bold;
  color:#00bfff;
}

/* Menu links */
.nav-list {
  list-style:none;
  display:flex;
  flex-direction:column; /* mobile first: colonne */
  width:100%;
  display:none; /* caché par défaut sur mobile */
  margin-top:10px;
}

.nav-list li a {
  text-decoration:none;
  color:#fff;
  padding:10px 0;
  display:block;
}

.nav-list li a:hover {
  color:#00bfff;
}

/* Hamburger */
.menu-toggle {
  font-size:1.8rem;
  cursor:pointer;
  color:#fff;
}

/* Quand menu actif */
.nav-list.active {
  display:flex;
}

/* Desktop */
@media(min-width:768px){
  .menu-toggle { display:none; }
  .nav-list {
    display:flex !important;
    flex-direction:row;
    width:auto;
    margin-top:0;
    gap:20px;
  }
}

    .lang-switch {
      margin-left: 20px;
      padding: 6px 12px;
      border: 1px solid #00bfff;
      border-radius: 6px;
      background: transparent;
      color: #fff;
      cursor: pointer;
      transition: background 0.3s;
    }
    .lang-switch:hover {
      background: #00bfff;
      color: #001030;
    }

    /* Hero Section */
    .hero-import {
      position: relative;
      height: 70vh;
      background: url('https://images.unsplash.com/photo-1581091215367-5ed2745fa63a?auto=format&fit=crop&w=1400&q=80') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
    }
    .hero-import::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(rgba(0,0,50,0.6), rgba(0,0,50,0.8));
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 0 20px;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      margin-bottom: 20px;
    }
    .hero-content p {
      font-size: 1.2rem;
      line-height: 1.6;
    }

    /* Section Générale */
    .section {
      padding: 60px 20px;
      text-align: center;
    }
    .section h2 {
      font-size: 2.2rem;
      margin-bottom: 20px;
      color: #00bfff;
    }
    .section p {
      max-width: 900px;
      margin: 0 auto 40px;
      font-size: 1.1rem;
      line-height: 1.8;
    }

    /* Services Grid */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
    }
    .service-card {
      background: rgba(255, 255, 255, 0.08);
      padding: 20px;
      border-radius: 15px;
      transition: transform 0.3s, background 0.3s;
      box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    }
    .service-card:hover {
      transform: translateY(-8px);
      background: rgba(255, 255, 255, 0.15);
    }
    .service-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 15px;
    }
    .service-card h3 {
      margin: 10px 0;
      color: #00bfff;
    }

    /* Formulaire devis */
    form {
      display: flex;
      flex-direction: column;
      gap: 15px;
      max-width: 650px;
      margin: 0 auto;
      text-align: left;
    }
    input, select, textarea {
      padding: 12px;
      border: none;
      border-radius: 8px;
      outline: none;
    }
    button {
      padding: 12px;
      border: none;
      background: #00bfff;
      color: white;
      font-size: 1rem;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.3s;
    }
    button:hover {
      background: #0080c0;
    }

    /* Footer */
    footer {
      text-align: center;
      padding: 20px;
      background: #000c20;
      font-size: 0.9rem;
    }

    /* Responsive */
    @media (max-width: 768px) {
      nav ul { 
        display: none; 
      }
      .hero-content h1 { font-size: 2rem; }
      .hero-content p { font-size: 1rem; }
    }
    
    #calculator {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 40px 20px;
    max-width: 800px;
    margin: 40px auto;
    box-shadow: 0 8px 25px rgba(0,0,0,0.4);
  }

  #calculator h2 {
    font-size: 2rem;
    color: #00bfff;
    margin-bottom: 15px;
  }

  #calculator p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #ddd;
  }

  /* Formulaire */
  .calc-form {
    display: grid;
    gap: 20px;
  }

  .form-group {
    text-align: left;
  }

  .form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: bold;
    color: #fff;
  }

  .calc-form input,
  .calc-form select {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    border: none;
    outline: none;
    font-size: 1rem;
    background: rgba(255,255,255,0.15);
    color: #fff;
  }

  .calc-form input::placeholder {
    color: #ccc;
  }

  .calc-form select {
    cursor: pointer;
  }

  /* Bouton */
  .calc-form button {
    background: #00bfff;
    color: #001030;
    border: none;
    border-radius: 8px;
    padding: 14px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
  }

  .calc-form button:hover {
    background: #0080c0;
    color: #fff;
    transform: translateY(-2px);
  }

  /* Résultat */
  .calc-result {
    margin-top: 25px;
    padding: 20px;
    background: rgba(0,191,255,0.1);
    border-radius: 12px;
    font-size: 1.2rem;
    color: #fff;
    text-align: center;
  }

  /* Responsive */
  @media (max-width: 600px) {
    #calculator {
      padding: 25px 15px;
    }
    #calculator h2 {
      font-size: 1.5rem;
    }
    .calc-form button {
      font-size: 1rem;
    }
  }
  
   /* Section Réglementations */
  #regulations {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 50px 20px;
    max-width: 1000px;
    margin: 40px auto;
  }

  #regulations h2 {
    color: #00bfff;
    margin-bottom: 20px;
  }

  .regulations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
  }

  .reg-card {
    background: rgba(0,0,0,0.4);
    padding: 25px;
    border-radius: 15px;
    text-align: left;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    transition: transform 0.3s;
  }

  .reg-card:hover {
    transform: translateY(-6px);
  }

  .reg-card h3 {
    color: #00bfff;
    margin-bottom: 15px;
  }

  .reg-card p, .reg-card li {
    color: #ddd;
    line-height: 1.6;
  }

  .reg-card ul {
    padding-left: 20px;
  }
  
  /* Section Certifications */
  #certifications {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 50px 20px;
    max-width: 1100px;
    margin: 40px auto;
    text-align: center;
  }

  #certifications h2 {
    color: #00bfff;
    margin-bottom: 15px;
  }

  #certifications p {
    color: #ddd;
    margin-bottom: 35px;
    line-height: 1.6;
  }

  .cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
  }

  .cert-card {
    background: rgba(0,0,0,0.4);
    border-radius: 15px;
    padding: 30px 20px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.3);
    transition: transform 0.3s ease;
  }

  .cert-card:hover {
    transform: translateY(-6px);
  }

  .cert-card img {
    width: 60px;
    margin-bottom: 15px;
  }

  .cert-card h3 {
    color: #00bfff;
    margin-bottom: 12px;
  }

  .cert-card p {
    color: #eee;
    font-size: 0.95em;
  }
  
   /* Section Témoignages avec images */
  #testimonials {
    background: rgba(0, 0, 50, 0.6);
    border-radius: 20px;
    padding: 50px 20px;
    max-width: 1100px;
    margin: 40px auto;
    text-align: center;
  }

  #testimonials h2 {
    color: #00bfff;
    margin-bottom: 15px;
  }

  #testimonials p {
    color: #ddd;
    margin-bottom: 40px;
    line-height: 1.6;
  }

  .testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
  }

  .testimonial-card {
    background: rgba(255, 255, 255, 0.08);
    padding: 25px 20px;
    border-radius: 15px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.3);
    transition: transform 0.3s ease;
    color: #fff;
    text-align: center;
  }

  .testimonial-card:hover {
    transform: translateY(-6px);
  }

  .testimonial-img {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    border: 2px solid #00bfff;
  }

  .testimonial-card p {
    font-style: italic;
    line-height: 1.5;
    margin-bottom: 15px;
  }

  .testimonial-card h4 {
    color: #00bfff;
    font-weight: bold;
    margin: 0;
  }

  /* Responsive */
  @media (max-width: 768px) {
    #testimonials {
      padding: 30px 15px;
    }
  }

  /* Responsive */
  @media (max-width: 768px) {
    #certifications {
      padding: 30px 15px;
    }
  }

  /* Responsive */
  @media (max-width: 768px) {
    #regulations {
      padding: 30px 15px;
    }
  }