/* ==========================================================================
   PORTAIL PÉDAGOGIQUE - STYLES PRINCIPAUX
   Thème : Moderne, Technologique, Épuré & Réactif
   ========================================================================== */

:root {
  /* Palette de couleurs principale */
  --bg-main: #0b0f19;
  --bg-surface: rgba(17, 24, 39, 0.75);
  --bg-card: rgba(22, 31, 48, 0.7);
  --bg-card-hover: rgba(30, 41, 64, 0.85);
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-light: #6b7280;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(255, 255, 255, 0.18);
  
  /* Thèmes par filière */
  --c-2sc-start: #06b6d4;
  --c-2sc-end: #10b981;
  --c-2sc-glow: rgba(16, 185, 129, 0.25);

  --c-3tech-start: #f59e0b;
  --c-3tech-end: #ea580c;
  --c-3tech-glow: rgba(245, 158, 11, 0.25);

  --c-3sti-start: #6366f1;
  --c-3sti-end: #9333ea;
  --c-3sti-glow: rgba(147, 51, 234, 0.25);

  --c-4sc-start: #ec4899;
  --c-4sc-end: #ef4444;
  --c-4sc-glow: rgba(239, 68, 68, 0.25);

  /* Effets & Rayons */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --glass-blur: blur(16px);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Mode Clair optionnel via attribut data-theme="light" */
[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.85);
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #94a3b8;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-highlight: rgba(0, 0, 0, 0.15);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* Arrière-plan dynamique avec halos lumineux */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.glow-1 {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, #6366f1 0%, transparent 70%);
  top: -100px;
  left: -100px;
}

.glow-2 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
  bottom: -150px;
  right: -100px;
  animation-duration: 24s;
}

.glow-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #ec4899 0%, transparent 70%);
  top: 40%;
  left: 60%;
  animation-duration: 20s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 60px) scale(1.08); }
  100% { transform: translate(-30px, -40px) scale(0.95); }
}

/* ==========================================================================
   NAVIGATION & EN-TÊTE
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-main);
  text-decoration: none;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: rotate(15deg);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero-section {
  position: relative;
  z-index: 1;
  padding: 3.5rem 0 2rem;
  text-align: center;
}

.teacher-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #818cf8;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

/* Barre de recherche et filtres */
.search-wrapper {
  max-width: 580px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.875rem 1.25rem 0.875rem 3rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  color: var(--text-main);
  font-size: 0.95rem;
  backdrop-filter: var(--glass-blur);
  transition: var(--transition-smooth);
}

.search-input:focus {
  outline: none;
  border-color: #6366f1;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
  background: var(--bg-card-hover);
}

.search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  pointer-events: none;
}

.clear-search-btn {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.clear-search-btn:hover {
  color: var(--text-main);
}

/* ==========================================================================
   GRILLE DES COURS (CARTES DE CLASSE)
   ========================================================================== */

.classes-section {
  position: relative;
  z-index: 1;
  padding: 1.5rem 0 4rem;
  flex: 1;
}

.course-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: var(--transition-smooth);
  overflow: hidden;
}

.course-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  z-index: 3;
  transition: var(--transition-smooth);
}

/* Image d'illustration de section */
.card-image-wrapper {
  position: relative;
  width: calc(100% + 3.5rem);
  margin-top: -2rem;
  margin-left: -1.75rem;
  margin-right: -1.75rem;
  margin-bottom: 1.25rem;
  height: 160px;
  overflow: hidden;
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
}

.card-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  display: block;
}

.course-card:hover .card-cover-img {
  transform: scale(1.08);
}

.card-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 15, 25, 0.15) 0%, rgba(22, 31, 48, 0.88) 100%);
  pointer-events: none;
}

[data-theme="light"] .card-image-overlay {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.9) 100%);
}

/* Variantes par filière */
.course-card.card-2sc::before {
  background: linear-gradient(90deg, var(--c-2sc-start), var(--c-2sc-end));
}
.course-card.card-2sc:hover {
  border-color: var(--c-2sc-start);
  box-shadow: 0 16px 32px var(--c-2sc-glow);
  transform: translateY(-8px);
}

.course-card.card-3tech::before {
  background: linear-gradient(90deg, var(--c-3tech-start), var(--c-3tech-end));
}
.course-card.card-3tech:hover {
  border-color: var(--c-3tech-start);
  box-shadow: 0 16px 32px var(--c-3tech-glow);
  transform: translateY(-8px);
}

.course-card.card-3sti::before {
  background: linear-gradient(90deg, var(--c-3sti-start), var(--c-3sti-end));
}
.course-card.card-3sti:hover {
  border-color: var(--c-3sti-start);
  box-shadow: 0 16px 32px var(--c-3sti-glow);
  transform: translateY(-8px);
}

.course-card.card-4sc::before {
  background: linear-gradient(90deg, var(--c-4sc-start), var(--c-4sc-end));
}
.course-card.card-4sc:hover {
  border-color: var(--c-4sc-start);
  box-shadow: 0 16px 32px var(--c-4sc-glow);
  transform: translateY(-8px);
}

/* En-tête de la carte */
.card-header-custom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  position: relative;
  z-index: 2;
}

.card-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  transition: var(--transition-smooth);
  margin-top: -36px;
  position: relative;
  z-index: 2;
  border: 2px solid var(--bg-card);
}

.brand-icon img,
.card-icon-box img,
.tool-icon img {
  display: block;
  object-fit: contain;
  pointer-events: none;
}

.course-card.card-2sc .card-icon-box {
  background: linear-gradient(135deg, var(--c-2sc-start), var(--c-2sc-end));
  box-shadow: 0 6px 16px var(--c-2sc-glow);
}
.course-card.card-3tech .card-icon-box {
  background: linear-gradient(135deg, var(--c-3tech-start), var(--c-3tech-end));
  box-shadow: 0 6px 16px var(--c-3tech-glow);
}
.course-card.card-3sti .card-icon-box {
  background: linear-gradient(135deg, var(--c-3sti-start), var(--c-3sti-end));
  box-shadow: 0 6px 16px var(--c-3sti-glow);
}
.course-card.card-4sc .card-icon-box {
  background: linear-gradient(135deg, var(--c-4sc-start), var(--c-4sc-end));
  box-shadow: 0 6px 16px var(--c-4sc-glow);
}

.course-card:hover .card-icon-box {
  transform: scale(1.08) rotate(3deg);
}

/* Statut et badges */
.status-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 50px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.status-active {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-pending {
  background: rgba(245, 158, 11, 0.12);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
}

.status-active .status-dot {
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* Contenu textuel */
.card-level {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
}

.card-title-custom {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  line-height: 1.3;
}

.card-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* Tags de chapitres / mots-clés */
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1.75rem;
}

.tag-item {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 3px 8px;
  border-radius: 6px;
  color: var(--text-muted);
}

/* Bouton d'action principal */
.card-action-btn {
  width: 100%;
  padding: 0.8rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-smooth);
}

.btn-primary-action {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border-color: var(--border-color);
}

.course-card:hover .btn-primary-action {
  background: var(--text-main);
  color: var(--bg-main);
  border-color: var(--text-main);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.btn-arrow {
  transition: transform 0.2s ease;
}

.course-card:hover .btn-arrow {
  transform: translateX(5px);
}

/* Message si aucun résultat de recherche */
.no-results {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
}

.no-results-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.6;
}

/* ==========================================================================
   SECTION OUTILS & RESSOURCES RAPIDES
   ========================================================================== */

.tools-section {
  position: relative;
  z-index: 1;
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--border-color);
}

.section-subtitle-pill {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #818cf8;
  margin-bottom: 0.5rem;
  display: block;
}

.section-header-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 2rem;
  color: var(--text-main);
}

.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition-smooth);
  height: 100%;
}

.tool-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  color: var(--text-main);
}

.tool-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tool-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

.tool-desc {
  font-size: 0.825rem;
  color: var(--text-muted);
  margin: 0;
}

/* ==========================================================================
   PIED DE PAGE
   ========================================================================== */

.site-footer {
  position: relative;
  z-index: 1;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
  margin-top: auto;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-link:hover {
  color: var(--text-main);
}

/* ==========================================================================
   MODAL & TOAST D'ALERTE (LIEN EN COURS)
   ========================================================================== */

.custom-toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1080;
}

.toast-custom {
  background: var(--bg-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  color: var(--text-main);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.toast-custom .toast-header {
  background: transparent;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
}

/* ==========================================================================
   RESPONSIVE OPTIMISATIONS
   ========================================================================== */

@media (max-width: 768px) {
  .hero-section {
    padding: 2.5rem 0 1.5rem;
  }
  .course-card {
    padding: 1.5rem 1.25rem;
  }
  .card-title-custom {
    font-size: 1.2rem;
  }
  .custom-toast-container {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }
}