/* ============================================
   MINI CHAT - Interface Moderne & Professionnelle
   Design System: Glassmorphism + Neumorphism
   ============================================ */

/* Reset et base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Palette de couleurs */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  
  /* Backgrounds */
  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.8);
  --bg-input: rgba(51, 65, 85, 0.6);
  
  /* Textes */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Effets */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.4);
  
  /* Bordures */
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-color: rgba(148, 163, 184, 0.2);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, var(--bg-dark) 0%, #1e293b 50%, #0f172a 100%);
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ============================================
   PAGE DE CONNEXION / INSCRIPTION
   ============================================ */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
}

.auth-container::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  opacity: 0.15;
  top: -200px;
  right: -200px;
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}

.auth-container::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
  opacity: 0.1;
  bottom: -100px;
  left: -100px;
  border-radius: 50%;
  animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

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

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.auth-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  z-index: 10;
}

.logo {
  text-align: center;
  margin-bottom: 30px;
}

.logo-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 36px;
  box-shadow: var(--shadow-md);
}

.logo h1 {
  font-size: 28px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 8px;
}

.auth-title {
  font-size: 24px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 25px;
  color: var(--text-primary);
}

/* Champs de formulaire */
.input-group {
  margin-bottom: 20px;
  position: relative;
}

.input-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.input-field {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-input);
  border: 2px solid transparent;
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-size: 15px;
  transition: all 0.3s ease;
  outline: none;
}

.input-field::placeholder {
  color: var(--text-muted);
}

.input-field:focus {
  border-color: var(--primary);
  background: rgba(51, 65, 85, 0.8);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Boutons */
.btn {
  width: 100%;
  padding: 14px 24px;
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
  margin-top: 12px;
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(99, 102, 241, 0.1);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 2px solid var(--danger);
  padding: 8px 16px;
  font-size: 13px;
  width: auto;
}

.btn-danger:hover {
  background: var(--danger);
  color: white;
}

/* Séparateur */
.divider {
  display: flex;
  align-items: center;
  margin: 24px 0;
  color: var(--text-muted);
  font-size: 13px;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.divider span {
  padding: 0 16px;
}

/* Liens */
.text-link {
  color: var(--primary-light);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.text-link:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* Alertes */
.alert {
  padding: 12px 16px;
  border-radius: var(--border-radius-sm);
  margin-bottom: 20px;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.alert-success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

/* ============================================
   PAGE DE CHAT (MESSAGES)
   ============================================ */
.chat-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.chat-header {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.header-info h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.header-info p {
  font-size: 13px;
  color: var(--text-secondary);
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-input);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
}

.user-badge .avatar {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--secondary) 0%, #059669 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

/* Zone de messages */
.chat-messages {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
  max-height: calc(100vh - 200px);
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.message-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message-item {
  display: flex;
  gap: 12px;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-avatar {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  flex-shrink: 0;
}

.message-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 12px 16px;
  max-width: 70%;
}

.message-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.message-author {
  font-weight: 600;
  font-size: 14px;
  color: var(--primary-light);
}

.message-time {
  font-size: 12px;
  color: var(--text-muted);
}

.message-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.5;
  word-wrap: break-word;
}

/* Message de l'utilisateur actuel */
.message-item.own {
  flex-direction: row-reverse;
}

.message-item.own .message-content {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-color: transparent;
}

.message-item.own .message-author {
  color: rgba(255, 255, 255, 0.9);
}

.message-item.own .message-text {
  color: white;
}

/* Zone de saisie */
.chat-input-area {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-color);
  padding: 20px 24px;
  position: sticky;
  bottom: 0;
}

.input-wrapper {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.message-input {
  flex: 1;
  padding: 14px 18px;
  background: var(--bg-input);
  border: 2px solid transparent;
  border-radius: 24px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: all 0.3s ease;
  resize: none;
  min-height: 48px;
  max-height: 120px;
}

.message-input:focus {
  border-color: var(--primary);
  background: rgba(51, 65, 85, 0.8);
}

.message-input::placeholder {
  color: var(--text-muted);
}

.send-btn {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 18px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.send-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.send-btn:active {
  transform: scale(0.95);
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 12px 16px;
  background: var(--bg-input);
  border-radius: 20px;
  width: fit-content;
  margin-bottom: 16px;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-10px); }
}

/* Scrollbar personnalisée */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Responsive */
@media (max-width: 640px) {
  .auth-card {
    padding: 30px 20px;
    margin: 20px;
  }
  
  .chat-header {
    padding: 12px 16px;
  }
  
  .chat-messages {
    padding: 16px;
  }
  
  .message-content {
    max-width: 85%;
  }
  
  .chat-input-area {
    padding: 16px;
  }
}

/* Loading spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   NOTIFICATIONS ET ALERTES AMÉLIORÉES
   ============================================ */

.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 16px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: slideInRight 0.3s ease, fadeOut 0.3s ease 2.7s;
  max-width: 400px;
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

.toast.success {
  border-left: 4px solid var(--secondary);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, var(--bg-card) 100%);
}

.toast.error {
  border-left: 4px solid var(--danger);
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, var(--bg-card) 100%);
}

/* ============================================
   EFFETS HOVER AMÉLIORÉS
   ============================================ */

.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.input-field:focus {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

/* ============================================
   ANIMATIONS SUPPLÉMENTAIRES
   ============================================ */

.auth-card {
  animation: scaleIn 0.5s ease;
}

.message-item {
  animation: slideUp 0.3s ease;
}

#loginSection, #registerSection {
  animation: fadeIn 0.4s ease;
}

.logo-icon {
  animation: float 3s ease-in-out infinite;
}

/* Effet de glow sur hover des messages */
.message-content:hover {
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.2);
  transform: translateY(-2px);
  transition: all 0.3s ease;
}

/* Indicateur de connexion */
.connection-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.connection-status::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--secondary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

/* Loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(99, 102, 241, 0.3);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Transition entre les sections */
#loginSection, #registerSection {
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}