/* ================================================================
   I-TeKnowLOGIA – Version 2.0 – Design Amélioré et Moderne
   ================================================================ */

/* ============ VARIABLES GLOBALES ============ */
:root {
  /* Couleurs principales */
  --color-primary: #1E40AF;
  --color-primary-dark: #1e3a8a;
  --color-primary-light: #3B82F6;
  --color-secondary: #F59E0B;
  --color-secondary-dark: #d97706;
  
  /* Couleurs par bloc */
  --color-ia: #3B82F6;
  --color-moa: #10B981;
  --color-cyber: #EF4444;
  --color-bi: #F59E0B;
  
  /* Couleurs texte */
  --color-text: #111827;
  --color-text-light: #6B7280;
  --color-text-lighter: #9CA3AF;
  
  /* Couleurs fond */
  --color-bg: #FFFFFF;
  --color-bg-light: #F9FAFB;
  --color-bg-lighter: #F3F4F6;
  --color-bg-dark: #1F2937;
  
  /* Couleurs border */
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  
  /* Ombres */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* ============ RESET ET BASE ============ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

/* ============ TYPOGRAPHIE ============ */
h1 {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

h5 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

p.small {
  font-size: 0.875rem;
  color: var(--color-text-lighter);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-secondary);
}

/* ============ LAYOUT ============ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============ HEADER ============ */
.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

nav ul {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

nav a {
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition-base);
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-secondary);
  transition: width var(--transition-base);
}

nav a:hover::after {
  width: 100%;
}

/* ============ BOUTONS ============ */
.btn {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  border-radius: 0.625rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #FFF;
  box-shadow: 0 4px 15px rgba(30, 64, 175, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(30, 64, 175, 0.3);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
  color: #FFF;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.2);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #FFF;
  transform: translateY(-2px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ============ CARDS ============ */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.875rem;
  padding: 1.75rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
  border-color: var(--color-primary-light);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-image {
  width: 100%;
  height: 220px;
  background: linear-gradient(135deg, var(--color-bg-lighter), var(--color-border));
  border-radius: 0.625rem;
  margin-bottom: 1.25rem;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.card:hover .card-image {
  transform: scale(1.02);
}

.card-badge {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.badge-ia {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-ia);
}

.badge-moa {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-moa);
}

.badge-cyber {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-cyber);
}

.badge-bi {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-bi);
}

/* ============ GRILLES ============ */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* ============ SECTIONS ============ */
section {
  padding: 4rem 0;
}

section.section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  margin-bottom: 0.75rem;
}

.section-title p {
  font-size: 1.125rem;
  color: var(--color-text-light);
}

/* ============ HERO ============ */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #FFF;
  padding: 6rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 50%;
}

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

.hero h1 {
  margin-bottom: 1.25rem;
  font-size: 3.25rem;
}

.hero p {
  font-size: 1.375rem;
  margin-bottom: 2.5rem;
  color: rgba(255, 255, 255, 0.95);
}

.hero-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============ FORMULAIRES ============ */
form .form-group {
  margin-bottom: 1.75rem;
}

label {
  display: block;
  margin-bottom: 0.625rem;
  font-weight: 600;
  color: var(--color-text);
}

input,
textarea,
select {
  width: 100%;
  padding: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: 0.625rem;
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transition-base);
  background: var(--color-bg);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

textarea {
  resize: vertical;
  min-height: 140px;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.checkbox-group input {
  width: auto;
  margin: 0;
}

/* ============ PAGINATION ============ */
.pagination {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 3rem;
  flex-wrap: wrap;
}

.pagination a,
.pagination span {
  padding: 0.625rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  transition: all var(--transition-base);
  cursor: pointer;
}

.pagination a:hover {
  background: var(--color-primary);
  color: #FFF;
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.pagination .active {
  background: var(--color-primary);
  color: #FFF;
  border-color: var(--color-primary);
}

/* ============ TABS ============ */
.tabs {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 2.5rem;
  gap: 0;
}

.tab-button {
  padding: 1rem 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text-light);
  border-bottom: 3px solid transparent;
  transition: all var(--transition-base);
  position: relative;
}

.tab-button:hover {
  color: var(--color-primary);
}

.tab-button.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  display: none;
  animation: fadeIn var(--transition-base);
}

.tab-content.active {
  display: block;
}

/* ============ FILTRES ============ */
.filters {
  background: var(--color-bg-lighter);
  padding: 2rem;
  border-radius: 0.875rem;
  border: 1px solid var(--color-border);
}

.filter-group {
  margin-bottom: 2rem;
}

.filter-group:last-child {
  margin-bottom: 0;
}

.filter-group h4 {
  margin-bottom: 1rem;
  font-size: 1rem;
  color: var(--color-text);
}

.filter-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.filter-option input[type="checkbox"] {
  width: auto;
  margin: 0;
  cursor: pointer;
}

.filter-option label {
  margin: 0;
  cursor: pointer;
  font-weight: 500;
}

/* ============ CHATBOT ============ */
.chatbot-widget {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
}

.chatbot-button {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #FFF;
  border: none;
  cursor: pointer;
  font-size: 1.75rem;
  box-shadow: 0 6px 20px rgba(30, 64, 175, 0.3);
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.chatbot-button:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 25px rgba(30, 64, 175, 0.4);
}

.chatbot-window {
  position: absolute;
  bottom: 90px;
  right: 0;
  width: 380px;
  height: 550px;
  background: #FFF;
  border-radius: 1rem;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  display: none;
  border: 1px solid var(--color-border);
}

.chatbot-window.active {
  display: flex;
  animation: slideUp var(--transition-base);
}

.chatbot-header {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #FFF;
  padding: 1.25rem;
  border-radius: 1rem 1rem 0 0;
  font-weight: 600;
  font-size: 1.125rem;
}

.chatbot-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.message {
  padding: 0.875rem 1rem;
  border-radius: 0.75rem;
  max-width: 85%;
  word-wrap: break-word;
  font-size: 0.95rem;
}

.message.user {
  background: var(--color-primary);
  color: #FFF;
  align-self: flex-end;
  border-radius: 0.75rem 0.25rem 0.75rem 0.75rem;
}

.message.bot {
  background: var(--color-bg-lighter);
  color: var(--color-text);
  align-self: flex-start;
  border-radius: 0.25rem 0.75rem 0.75rem 0.75rem;
}

.chatbot-input {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-light);
  border-radius: 0 0 1rem 1rem;
}

.chatbot-input input {
  flex: 1;
  margin: 0;
  padding: 0.75rem;
}

.chatbot-input button {
  padding: 0.75rem 1.25rem;
  background: var(--color-primary);
  color: #FFF;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-base);
}

.chatbot-input button:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* ============ FOOTER ============ */
.footer {
  background: var(--color-bg-dark);
  color: #FFF;
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: #FFF;
  margin-bottom: 1rem;
  font-size: 1.125rem;
}

.footer-section p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.75rem;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-base);
}

.footer-section a:hover {
  color: #FFF;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
}

/* ============ ANIMATIONS ============ */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .container {
    padding: 0 1.25rem;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.875rem;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  nav ul {
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  .header-content {
    flex-direction: column;
    gap: 1rem;
  }

  nav ul {
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
  }

  nav a {
    padding: 0.5rem 0;
  }

  h1 {
    font-size: 1.875rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero {
    padding: 4rem 0;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1.125rem;
  }

  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }

  .hero-buttons .btn {
    width: 100%;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .tabs {
    gap: 0.5rem;
  }

  .tab-button {
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
  }

  .chatbot-window {
    width: 100vw;
    height: 70vh;
    max-width: 100%;
    bottom: 0;
    right: 0;
    left: 0;
    border-radius: 1.5rem 1.5rem 0 0;
  }

  section {
    padding: 3rem 0;
  }

  section.section {
    padding: 3rem 0;
  }

  .section-title {
    margin-bottom: 2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.75rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.125rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .card {
    padding: 1.25rem;
  }

  .card-image {
    height: 160px;
  }

  nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }

  .chatbot-button {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
  }

  .chatbot-widget {
    bottom: 1rem;
    right: 1rem;
  }

  .section-title {
    margin-bottom: 1.5rem;
  }

  .section-title h2 {
    margin-bottom: 0.5rem;
  }
}

/* ============ UTILITAIRES ============ */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mt-1 {
  margin-top: 0.5rem;
}

.mt-2 {
  margin-top: 1rem;
}

.mt-3 {
  margin-top: 1.5rem;
}

.mt-4 {
  margin-top: 2rem;
}

.mb-1 {
  margin-bottom: 0.5rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

.mb-3 {
  margin-bottom: 1.5rem;
}

.mb-4 {
  margin-bottom: 2rem;
}

.hidden {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}