/* RESET + HEADER */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
  background-color: #f5f5f5;
  color: #333;
  scroll-behavior: smooth;
}

header {
  position: fixed;
  width: 100%;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(0,0,0,0.6);
  padding: 1rem 2rem;
  z-index: 1000;
  transition: background-color 0.3s ease;
}

.logo {
  font-family: 'Orbitron', sans-serif;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

nav ul {
  display: flex;
  list-style: none;
}

nav li {
  margin-left: 2rem;
}

nav a {
  text-decoration: none;
  color: white;
  font-weight: bold;
  transition: color 0.3s ease;
}

nav a:hover {
  color: #ffcc00;
}

/* HERO */
.hero {
  background-image: url('IMG/background/soluce_1.jpg');
  background-size: cover;
  background-position: center;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
  position: relative;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.4);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 3em;
  animation: fadeInDown 1s ease forwards;
}

/* ANIMATION */
@keyframes fadeInDown {
  0% { opacity: 0; transform: translateY(-20px); }
  100% { opacity: 1; transform: translateY(0); }
}

[data-anim] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-anim].visible {
  opacity: 1;
  transform: translateY(0);
}

/* SOLUTIONS SECTION */
.solutions {
  padding: 120px 10% 60px;
  background: white;
}

.solution {
  margin-bottom: 80px;
  padding-bottom: 40px;
  border-bottom: 1px solid #ddd;
}

.solution h2 {
  font-size: 2em;
  color: #222;
  margin-bottom: 10px;
}

.solution h3 {
  font-size: 1.2em;
  color: #666;
  margin-bottom: 20px;
}

.solution .images {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.solution img {
  width: 48%;
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
}

.solution img:hover {
  transform: scale(1.03);
}

.solution p {
  font-size: 1.1em;
  line-height: 1.6;
}

.footer {
  text-align: center;
  padding: 3rem 0;
  background-color: #222;
}

.sources-btn {
  background-color: #ffcc00;
  border: none;
  padding: 1rem 2rem;
  font-size: 1rem;
  border-radius: 30px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.sources-btn:hover {
  background-color: #e6b800;
}