/* 1. Général et fond */
body {
  margin: 0;
  background: linear-gradient(135deg, #0d1120 0%, #1b2250 100%);
  font-family: 'Segoe UI', Arial, sans-serif;
  color: #f5f6fa;
}

/* 2. Conteneur principal centré et responsive */
.page-container {
  max-width: 820px;
  margin: 2rem auto;
  padding: 4rem 2rem; /* vert (plus grand = moins haut) / hori */
  box-sizing: border-box;
  width: 95vw;
}


/* 3. Navigation supérieure */
.top-nav {
  display: flex;
  gap: 2.5rem;
  justify-content: center;
  padding: 1.2rem 0 0.5rem 0;
  background: rgba(10, 20, 50, 0.85);
  border-bottom: 2px solid #2a3ca6;
  box-shadow: 0 2px 12px #2a3ca655;
  border-radius: 12px 12px 0 0;
  margin-bottom: 1.5rem;
}
.top-nav a {
  color: #6ec6ff;
  text-decoration: none;
  font-weight: bold;
  font-size: 1.15rem;
  letter-spacing: 1px;
  transition: color 0.2s, text-shadow 0.2s;
}
.top-nav a:hover {
  color: #fff;
  text-shadow: 0 0 8px #6ec6ff, 0 0 2px #fff;
}

/* 4. Titre centré */
.page-title {
  text-align: center;
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 2.2rem;
  letter-spacing: 1px;
  color: #e6ecff;
  text-shadow: 0 0 16px #2a3ca6, 0 2px 12px #000a;
  word-break: break-word;
}

/* 5. Onglets et barre de recherche (centrés) */
.tabs-search-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 2.2rem;
}
.tabs {
  display: flex;
  gap: 1.1rem;
  justify-content: center;
}
.tab {
  background: linear-gradient(90deg, #232b4a 0%, #2a3ca6 100%);
  color: #bfc7e6;
  border: 2px solid #2a3ca6;
  border-radius: 12px 12px 0 0;
  padding: 0.7rem 2.3rem;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  opacity: 0.8;
  transition: background 0.2s, color 0.2s, opacity 0.2s, border-color 0.2s;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.tab.active {
  background: linear-gradient(90deg, #3e51b5 0%, #6ec6ff 100%);
  color: #fff;
  opacity: 1;
  border-color: #6ec6ff;
  box-shadow: 0 2px 8px #6ec6ff55, 0 0 8px #fff2;
}
.tab:not(.active):hover {
  opacity: 1;
  background: #28325a;
  color: #e6ecff;
  border-color: #3e51b5;
}

/* 6. Barre de recherche */
.search-bar {
  background: #232b4a;
  color: #e6ecff;
  border: 2px solid #2a3ca6;
  border-radius: 20px;
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
  width: 220px;
  max-width: 100vw;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px #3949ab22;
}
.search-bar:focus {
  border-color: #6ec6ff;
  box-shadow: 0 0 10px #6ec6ff88;
}
.search-bar::placeholder {
  color: #bfc7e6;
  opacity: 0.7;
}

/* 7. Contenu des onglets */
.tab-content {
  background: rgba(20, 30, 60, 0.92);
  border-radius: 0 0 14px 14px;
  box-shadow: 0 6px 32px #2a3ca644;
  padding: 2.2rem 2.5rem;
  margin-bottom: 2rem;
  width: 100%;
  box-sizing: border-box;
}
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
  animation: fadeInPanel 0.4s;
}
@keyframes fadeInPanel {
  from { opacity: 0; transform: translateY(20px);}
  to   { opacity: 1; transform: translateY(0);}
}

/* 8. Sections et checklist */
.section {
  margin-bottom: 2.5rem;
  background: #181c30;
  border-radius: 10px;
  padding: 1.2rem 1.5rem;
  box-shadow: 0 2px 8px #232b4a22;
  border-left: 4px solid #2a3ca6;
}
.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1.1rem;
  color: #bfc7e6;
  letter-spacing: 0.5px;
}
.subsection {
  margin-bottom: 1.2rem;
  background: #232b4a;
  border-radius: 7px;
  padding: 0.9rem 1.2rem;
}
.subsection-title {
  font-size: 1.07rem;
  font-weight: 600;
  margin-bottom: 0.7rem;
  color: #e6ecff;
}
.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}
.checklist li {
  margin-bottom: 0.6rem;
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
  transition: background 0.2s;
}
.checklist li.highlight {
  background: linear-gradient(90deg, #2a3ca622, #6ec6ff44);
  color: #fff;
  font-weight: bold;
}
.checklist label {
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.checklist input[type="checkbox"] {
  accent-color: #3e51b5;
  width: 1.1rem;
  height: 1.1rem;
}
.checklist a {
  color: #8eaaff;
  text-decoration: underline;
  font-weight: 600;
  transition: color 0.2s;
}
.checklist a:hover {
  color: #e6ecff;
}

/* 9. Responsive : adaptation pour petits écrans */
@media (max-width: 900px) {
  .page-container {
    padding: 1.2rem 0.5rem;
    max-width: 99vw;
  }
  .tab-content {
    padding: 1.2rem 0.5rem;
  }
}
@media (max-width: 700px) {
  .top-nav {
    flex-direction: column;
    gap: 0.7rem;
    font-size: 1rem;
    padding: 0.7rem 0 0.3rem 0;
  }
  .page-title {
    font-size: 1.5rem;
    margin-bottom: 1.1rem;
  }
  .tabs-search-bar {
    flex-direction: column;
    gap: 0.7rem;
    align-items: center;
  }
  .tabs {
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
    align-items: center;
  }
  .tab {
    width: 100%;
    min-width: unset;
    font-size: 1rem;
    border-radius: 8px;
    text-align: center;
  }
  .search-bar {
    width: 100%;
    max-width: 100vw;
    font-size: 1rem;
    margin-top: 0.7rem;
  }
  .tab-content {
    padding: 0.7rem 0.2rem;
  }
  .section,
  .subsection {
    padding: 0.7rem 0.3rem;
  }
}
@media (max-width: 400px) {
  .page-title {
    font-size: 1.1rem;
    margin: 1rem 0;
  }
  .tab {
    font-size: 0.95rem;
    padding: 0.5rem 0.7rem;
  }
}