/* ---------- FOND D'ÉCRAN ÉLÉGANT & ANIMÉ ---------- */
body {
  font-family: 'Open Sans', sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #f9f7f1, #eae7de);
  background-image: url('https://www.transparenttextures.com/patterns/paper-fibers.png');
  background-repeat: repeat;
  background-size: 400px 400px;
  transition: background-color 0.4s ease, color 0.4s ease;
  position: relative;
  overflow-x: hidden;
  z-index: 0;
  background-size: 600% 600%;
  animation: backgroundGradient 30s ease infinite;
}

@keyframes backgroundGradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Motif géométrique discret façon "planche" */
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  background-image: radial-gradient(#aaa 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.04;
  z-index: -1;
  pointer-events: none;
}

/* Canvas pour particules */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
}

/* ---------- CONTAINERS ---------- */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.container.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- HEADER ---------- */
header {
  background: #4ca1af;
  color: white;
  text-align: center;
  padding: 40px 20px;
}

.intro img.photo-profil {
  max-width: 150px;
  border-radius: 50%;
  margin-top: 20px;
  transition: transform 0.6s ease, box-shadow 0.6s ease;
}
.intro img.photo-profil:hover {
  transform: rotateY(10deg) rotateX(5deg) scale(1.05);
  box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

/* ---------- BOUTONS ---------- */
.btn {
  display: inline-block;
  margin: 10px;
  padding: 10px 20px;
  background-color: white;
  color: #4ca1af;
  text-decoration: none;
  font-weight: bold;
  border-radius: 30px;
  transition: background-color 0.3s ease, transform 0.2s ease;
}
.btn:hover {
  background-color: #eee;
  transform: translateY(-2px) scale(1.05);
}

/* ---------- TITRES ---------- */
h2 {
  cursor: pointer;
  padding: 10px;
  background-color: #f1f1f1;
  border-left: 4px solid #4ca1af;
  transition: background-color 0.3s, text-shadow 0.6s ease, color 0.6s ease;
}
h2:hover {
  background-color: #e0e0e0;
}

/* ---------- CONTENU DES SECTIONS (toggle fluide PC + mobile) ---------- */
.toggle-content {
  max-height: 0;
  overflow: hidden;
  padding: 0 15px;
  margin-bottom: 0;
  border-left: 4px solid #4ca1af;
  background-color: #fafafa;
  transition: max-height 0.4s ease, padding 0.4s ease, margin-bottom 0.4s ease;
}

.toggle-content.open {
  max-height: 1000px;
  padding: 10px 15px;
  margin-bottom: 20px;
}

/* ---------- FOOTER ---------- */
footer {
  text-align: center;
  padding: 20px;
  background-color: #f9f9f9;
  font-size: 0.9em;
}

/* ---------- MODE SOMBRE ---------- */
body.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
  background-image: none;
  animation: none;
  transition: background-color 0.6s ease, color 0.6s ease;
}
body.dark-mode h2 {
  background-color: #1e1e1e;
  color: #f0f0f0;
  text-shadow: 0 0 10px rgba(76,161,175,0.6), 0 0 20px rgba(76,161,175,0.4);
}
body.dark-mode .toggle-content {
  background-color: #1a1a1a;
  border-left-color: #4ca1af;
}
body.dark-mode::before {
  background-image: radial-gradient(#555 1px, transparent 1px);
  opacity: 0.06;
}

/* ---------- ÉTOILES SCINTILLANTES EN DARK MODE ---------- */
.star {
  position: absolute;
  background: white;
  border-radius: 50%;
  opacity: 0;
  animation: twinkle 3s infinite ease-in-out;
}
@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.2); }
}

/* ---------- CURSEUR PERSONNALISÉ ---------- */
.cursor {
  width: 20px;
  height: 20px;
  border: 2px solid #4ca1af;
  border-radius: 50%;
  position: fixed;
  transform: translate(-50%, -50%);
  pointer-events: none;
  transition: transform 0.1s ease-out;
  z-index: 10000;
}

/* ---------- BOUTON DARK MODE ---------- */
#dark-mode-btn {
  transition: transform 0.6s ease;
}
#dark-mode-btn.rotate {
  transform: rotate(360deg);
}

/* ---------- RESPONSIVE ---------- */
@media screen and (max-width: 600px) {
  header {
    padding: 20px 10px;
  }
  .intro img.photo-profil {
    max-width: 100px;
    display: block;
    margin: 20px auto;
  }
  .btn {
    display: block;
    width: 80%;
    margin: 10px auto;
    font-size: 1rem;
    text-align: center;
  }
  h1 {
    font-size: 1.6rem;
  }
  h2 {
    font-size: 1.2rem;
  }
  p, li {
    font-size: 0.95rem;
  }
  .container {
    padding: 10px;
  }
}

/* ---------- MESSAGE DE BIENVENUE ---------- */
#welcome-message {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #4ca1af;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2rem;
  font-weight: bold;
  z-index: 9999;
  opacity: 1;
  transition: opacity 1s ease;
}
#welcome-message.fade-out {
  opacity: 0;
  pointer-events: none;
}

/* ✅ Cette partie nécessite un script JS pour enlever l’écran d’intro */
body > *:not(#welcome-message) {
  display: none;
}
body.ready > *:not(#welcome-message) {
  display: block;
}

/* ---------- CERTIFICATS PREMIUM MODERNES & SOBRES ---------- */
.certificats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 20px;
  padding: 0 10px;
}

.certificat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  padding: 14px 20px;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
  cursor: pointer;
  animation: float 6s ease-in-out infinite;
}

.certificat-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.15), 0 0 8px rgba(76,161,175,0.25);
  background: rgba(255, 255, 255, 1);
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-3px); }
}

.certificat-item p {
  margin: 0;
  font-weight: 600;
  font-size: 0.95rem;
  color: #2c3e50;
  transition: color 0.3s ease, text-shadow 0.3s ease;
}

.certificat-item:hover p {
  color: #4ca1af;
  text-shadow: 0 0 4px rgba(76,161,175,0.25);
}

.certificat-item .btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.9);
  color: #4ca1af;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 10px;
  border: 1px solid rgba(76,161,175,0.3);
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.certificat-item .btn svg,
.certificat-item .btn i {
  font-size: 1rem;
  transition: transform 0.25s ease;
}

.certificat-item .btn:hover {
  transform: translateY(-2px) scale(1.05);
  background: rgba(255,255,255,1);
  color: #357a8f;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.certificat-item .btn:hover svg,
.certificat-item .btn:hover i {
  transform: rotate(15deg) scale(1.1);
}

@media (min-width: 768px) {
  .certificats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- H3 & CONTENU TOGGLE POUR LES CERTIFICATS ---------- */
#certificats h3 {
  cursor: pointer;
  padding: 10px;
  margin-top: 20px;
  background-color: #f1f1f1;
  border-left: 4px solid #4ca1af;
  transition: background-color 0.3s ease, color 0.3s ease;
}

#certificats h3:hover {
  background-color: #e0e0e0;
}

#certificats .toggle-content {
  max-height: 0;
  overflow: hidden;
  padding: 0 15px;
  margin-bottom: 0;
  border-left: 4px solid #4ca1af;
  background-color: #fafafa;
  transition: max-height 0.4s ease, padding 0.4s ease, margin-bottom 0.4s ease;
}

#certificats .toggle-content.open {
  max-height: 1000px;
  padding: 10px 15px;
  margin-bottom: 20px;
}

/* ---------- DARK MODE POUR LES SOUS-SECTIONS CERTIFICATS ---------- */
body.dark-mode #certificats h3 {
  background-color: #1e1e1e;
  color: #f0f0f0;
}

body.dark-mode #certificats .toggle-content {
  background-color: #1a1a1a;
  border-left-color: #4ca1af;
}

/* ---------- MODE SOMBRE POUR CERTIFICATS ---------- */
body.dark-mode .certificat-item {
  background: rgba(40, 40, 40, 0.95);
  box-shadow: 0 4px 12px rgba(0,0,0,0.35);
}

body.dark-mode .certificat-item p {
  color: #e0f7fa;
  text-shadow: 0 0 4px rgba(76,161,175,0.5);
}

body.dark-mode .certificat-item:hover p {
  color: #4ca1af;
  text-shadow: 0 0 6px rgba(76,161,175,0.7);
}

body.dark-mode .certificat-item .btn {
  background: rgba(60,60,60,0.9);
  color: #79c8d0;
  border: 1px solid rgba(121,200,208,0.3);
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
}

body.dark-mode .certificat-item .btn:hover {
  background: rgba(60,60,60,1);
  color: #4ca1af;
  box-shadow: 0 4px 12px rgba(121,200,208,0.35);
}