:root {
      /* Mode sombre (bleu night) - valeurs par défaut */
      --bg-color: #0a1128;
      --accent: #3a86ff;
      --accent-gradient: linear-gradient(90deg, #3a86ff, #0057b7);
      --text-color: #e0e6f8;
      --text-secondary: #a9bcd0;
      --card-bg: #14213d;
      --transition: all 0.3s ease;
    }

    /* Mode clair */
    .light-theme {
      --bg-color: #e8f0fe;
      --accent: #1a73e8;
      --accent-gradient: linear-gradient(90deg, #1a73e8, #155ab6);
      --text-color: #202124;
      --text-secondary: #5f6368;
      --card-bg: #ffffff;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', sans-serif;
      background: var(--bg-color);
      color: var(--text-color);
      overflow-x: hidden;
      scroll-behavior: smooth;
      transition: var(--transition);
    }
    header {
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: rgba(10, 17, 40, 0.9);
      backdrop-filter: blur(10px);
      position: sticky;
      top: 0;
      z-index: 999;
      flex-wrap: wrap;
      transition: var(--transition);
    }
    .light-theme header {
      background: rgba(255 255 255 / 0.9);
      color: var(--text-color);
    }
    header h1 {
      font-size: 1.5rem;
      color: var(--accent);
      transition: var(--transition);
    }
    nav {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
    }
    nav a {
      color: var(--text-color);
      margin: 0.5rem 1rem;
      text-decoration: none;
      font-weight: 500;
      position: relative;
      transition: var(--transition);
    }
    nav a::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      background: var(--accent);
      left: 0;
      bottom: -5px;
      transition: var(--transition);
    }
    nav a:hover::after {
      width: 100%;
    }

#backToTop {
  position: fixed;
  bottom: 40px;
  right: 20px;
  background-color: #0a1128;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 45px;
  height: 45px;
  font-size: 18px;
  cursor: pointer;
  display: none;
  z-index: 1000;
  transition: background-color 0.3s;
}
#backToTop:hover {
  background-color: #333;
}

.hero, .cards {
  max-width: 1200px;
  margin: 0 auto;
}

.first{      background: linear-gradient(to bottom, var(--bg-color) 0%, var(--card-bg) 100%);
      transition: var(--transition);
	  }
	  
    .hero {
      text-align: center;
      padding: 4rem 1rem; 
	   }
	
    .hero h2 {
      font-size: 2rem;
      font-weight: 700;
      max-width: 700px;
      margin-inline: auto;
      color: var(--text-color);
      transition: var(--transition);
    }
    .hero p {
      margin-top: 1rem;
      font-size: 1rem;
      max-width: 700px;
      margin-inline: auto;
      line-height: 1.6;
      color: var(--text-secondary);
      transition: var(--transition);
    }

    .cv-button {
      display: inline-block;
      margin-top: 1.5rem;
      background-image: var(--accent-gradient);
      color: #fff;
      padding: 0.6rem 1.4rem;
      border-radius: 30px;
      text-decoration: none;
      font-weight: 500;
      transition: var(--transition);
    }
    .cv-button:hover {
      opacity: 0.9;
    }

    .cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
      padding: 3rem 1rem;
    }
    .cards h3 {
      color: var(--accent);
      padding: 1rem 0rem;
      transition: var(--transition);
    }
    .card {
      background: var(--card-bg);
      padding: 2rem;
      border-radius: 20px;
      box-shadow: 0 10px 25px rgba(58, 134, 255, 0.3);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
      color: var(--text-color);
	  line-height: 1.4rem;
    }
    .card::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
      opacity: 0.05;
      animation: pulse 8s infinite;
      transition: var(--transition);
    }
    @keyframes pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.1); }
      100% { transform: scale(1); }
    }
    .card:hover {
      transform: translateY(-10px);
    }

header h2.small_title {
  font-size: 1rem;
  margin-top: 0.3rem;
  color: var(--text-secondary);
}

    .stats {
      padding: 3rem 1rem;
      background: #14213d;
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      transition: var(--transition);
    }
    .light-theme .stats {
      background: #f0f3ff;
    }
    .stat {
      margin: 1rem;
      flex: 1 1 120px;
    }
    .stat h3 {
      font-size: 1.8rem;
      color: var(--accent);
      transition: var(--transition);
    }
    .stat p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      transition: var(--transition);
    }

    #tools {
      background: #14213d;
      padding: 3rem 1rem;
      text-align: center;
      border-radius: 20px;
      margin: 3rem auto;
      max-width: 900px;
      transition: var(--transition);
    }
    .light-theme #tools {
      background: #f0f3ff;
    }
    #tools h2 {
      color: var(--accent);
      margin-bottom: 2rem;
      font-weight: 700;
      font-size: 1.8rem;
      transition: var(--transition);
    }
    .tool-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 2rem;
    }
    .tool {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100px;
      color: var(--accent);
      cursor: default;
      transition: transform 0.3s ease, color 0.3s ease;
    }
    .tool i {
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
    }
    .tool span {
      font-size: 0.9rem;
      font-weight: 600;
    }
    .tool:hover {
      transform: scale(1.1);
      color: #0057b7;
    }

    footer {
      padding: 2rem;
      text-align: center;
      background: #0a1128;
      transition: var(--transition);
    }
    .light-theme footer {
      background: #e8f0fe;
    }
    .linkedin {
      color: var(--text-color);
      font-size: 1.8rem;
      transition: var(--transition);
    }
    .linkedin:hover {
      color: var(--accent);
    }
	
	.about-me {
  max-width: 900px;
  margin: 4rem auto;
  padding: 2rem 1rem;
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: 0 10px 25px rgba(58, 134, 255, 0.3);
  display: flex;
  justify-content: center;
  transition: var(--transition);
}

.about-container {
      max-width: 700px;
      margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;

}

.about-image img {
  width: 300px;
  height: 300px;
  border-radius: 20px;
  object-fit: cover;
  box-shadow: 0 5px 15px rgba(58, 134, 255, 0.5);
  transition: var(--transition);
}

.about-text {
  flex: 1;
  color: var(--text-color);
}

.about-text h2 {
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-text p {
  line-height: 1.6;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.about-text .cv-button {
  margin-top: 1rem;
  background-image: var(--accent-gradient);
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  transition: var(--transition);
}

.about-text .cv-button:hover {
  opacity: 0.9;
}

:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 768px) {

  .about-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .about-image {
    display: flex;
    justify-content: center;
    width: 100%;
    max-width: 300px;
    height: auto;
  }

  .about-image img {
    width: 200px;
    height: 200px;
  }
  
  .about-me {
    flex-direction: column;
    padding: 1rem;
  }

  .about-text {
    text-align: center;
  }

      header {
        flex-direction: column;
        align-items: flex-start;
      }
      nav {
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-top: 1rem;
      }
      .hero h2 {
        font-size: 1.5rem;
      }
    }
	
	@media (max-width: 480px) {
  .hero, .about-me {
    padding: 2rem 1rem;
  }
}

@media (max-width: 768px) {
  header h2.small_title,
  .theme-toggle {
    display: none;
  }

  header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  nav {
    margin-top: 0;
  }
}

@media (max-width: 480px) {
  .about-image img {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    display: block;
  }
}

    /* Toggle switch styles */
    .theme-toggle {
      cursor: pointer;
      font-size: 1.5rem;
      color: var(--accent);
      transition: var(--transition);
      user-select: none;
      margin-left: 1rem;
    }
    .theme-toggle:hover {
      color: #0057b7;
    }