* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-card: #1c2128;
  --bg-hover: #262c36;
  --accent-primary: #58a6ff;
  --accent-secondary: #7c3aed;
  --accent-success: #238636;
  --accent-warning: #d29922;
  --accent-danger: #da3633;
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --border-primary: #30363d;
  --border-secondary: #21262d;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  font-size: 14px;
}

/* Login Styles */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  padding: 1rem;
}

.login-box {
  background: var(--bg-secondary);
  padding: 2.5rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-primary);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
}

.login-box h2 {
  color: var(--text-primary);
  margin-bottom: 2rem;
  font-weight: 600;
  font-size: 2rem;
  text-align: center;
}

/* Panel Layout */
.panel-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-primary);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  z-index: 1000;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
}

.sidebar-header h1 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-header .user-info {
  color: var(--text-secondary);
  font-size: 12px;
}

.sidebar-nav {
  padding: 1rem 0;
}

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

.nav-section-title {
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0 1rem 0.5rem;
  padding-bottom: 0.5rem;
}

.nav-item {
  margin: 0 0.5rem;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  font-size: 14px;
  font-weight: 500;
}

.nav-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--accent-primary);
  color: white;
}

.nav-link .icon {
  margin-right: 0.75rem;
  font-size: 16px;
  width: 20px;
  text-align: center;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 280px;
  padding: 2rem;
  background: var(--bg-primary);
  min-height: 100vh;
}

.content-header {
  margin-bottom: 2rem;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
}

.header-text h2 {
  color: var(--text-primary);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-text p {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0;
}

.header-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-shrink: 0;
}

.content-header h2 {
  color: var(--text-primary);
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.content-header p {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  transition: all 0.2s ease;
}

.stat-card:hover {
  background: var(--bg-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 0.25rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all 0.2s ease;
}

.card:hover {
  background: var(--bg-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.card-icon {
  font-size: 1.5rem;
  margin-right: 0.75rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
}

.card h3 {
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.5;
  font-size: 14px;
}

/* Boutons globaux améliorés */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  transition: all 0.2s ease;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  line-height: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.5s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), #4c8eff);
  color: white;
  border-color: var(--accent-primary);
  box-shadow: 0 2px 8px rgba(88, 166, 255, 0.2);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #4c8eff, var(--accent-primary));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(88, 166, 255, 0.3);
  color: white;
  text-decoration: none;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--text-secondary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  color: var(--text-primary);
  text-decoration: none;
}

.btn:disabled, .btn.btn-disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.btn-icon {
  padding: 0.75rem;
  min-width: auto;
}

/* Notifications système */
.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  max-width: 400px;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: white;
  font-weight: 500;
  animation: slideInRight 0.3s ease;
}

.notification-success {
  background: var(--accent-success);
}

.notification-error {
  background: var(--accent-danger);
}

.notification-warning {
  background: var(--accent-warning);
}

.notification-info {
  background: var(--accent-primary);
}

.notification-close {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  padding: 0.25rem;
  margin-left: auto;
  border-radius: var(--radius-sm);
  transition: background 0.2s ease;
}

.notification-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

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

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

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.pulse {
  animation: pulse 2s infinite;
}

/* Tooltips personnalisés */
.custom-tooltip {
  position: absolute;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 12px;
  border: 1px solid var(--border-primary);
  z-index: 1000;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: var(--shadow-md);
}

/* États de chargement */
.loading {
  opacity: 0.7;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid transparent;
  border-top: 2px solid var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Améliorations responsives */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .header-actions {
    align-self: stretch;
  }
  
  .btn {
    padding: 0.625rem 1.25rem;
    font-size: 13px;
  }
  
  .notification {
    right: 10px;
    left: 10px;
    max-width: none;
  }
}

@media (max-width: 480px) {
  .header-text h2 {
    font-size: 1.5rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 12px;
  }
  
  .btn-icon {
    padding: 0.5rem;
  }
  
  .login-box {
    padding: 1.5rem;
  }
}