select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: var(--space-sm);
}

select option:hover {
  background: var(--bg-tertiary);
}

select option:checked {
  background: var(--accent-primary);
  color: white;
}

select {
  background: var(--bg-card) !important;
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color) !important;
}

select option:disabled {
  background: var(--bg-primary);
  color: var(--text-muted);
  opacity: 0.5;
}

.edit-btn, .delete-btn {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.edit-btn {
  background: var(--accent-success);
  color: white;
}

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

.edit-btn:hover, .delete-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-md);
}

#adminModal {
  display: none;
  position: fixed;
  z-index: 1001;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
}

#adminModal[style*="display: block"],
#adminModal.show {
  display: block !important;
}

#adminView {
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
}

#adminView > * {
  display: block !important;
}

#adminView * {
  visibility: visible !important;
  opacity: 1 !important;
  
}

#adminView .fa-floppy-disk {color: #1a1a2d;}

.dir-name {
  font-weight: 600;
  color: var(--accent-secondary);
  flex-grow: 1;
}

.dir-actions {
  display: flex;
  gap: var(--space-xs);
}

.lock-icon {
  color: #fbbf24;
  font-size: 14px;
  margin-left: 4px;
  opacity: 0.9;
  display: inline-flex;
  align-items: center;
  width: 14px;
  height: 14px;
  justify-content: center;
}

#addDirectoryModal,
#editGroupModal,
#deleteGroupConfirmModal,
#deleteConfirmModal,
#passwordModal,
#addGroupModal,
#userLogsModal {
  z-index: 2000 !important;
}

#notification {
  position: fixed;
  top: 24px;
  right: 24px;
  padding: 16px 24px;
  border-radius: 16px;
  font-weight: 600;
  font-size: 0.95rem;
  z-index: 99999;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 
    0 10px 40px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  transform: translateX(calc(100% + 50px));
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
  max-width: 400px;
  min-width: 280px;
  display: flex;
  align-items: center;
  gap: 12px;
}

#notification.show {
  transform: translateX(0);
  opacity: 1;
}

#notification.hidden {
  transform: translateX(calc(100% + 50px));
  opacity: 0;
  pointer-events: none;
}

#notification.success {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.95), rgba(5, 150, 105, 0.9));
  color: white;
  border: none;
}

#notification.error {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.95), rgba(220, 38, 38, 0.9));
  color: white;
  border: none;
}

#notification.warning {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.95), rgba(217, 119, 6, 0.9));
  color: white;
  border: none;
}

#notification.info {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.95), rgba(37, 99, 235, 0.9));
  color: white;
  border: none;
}

#notification .fas,
#notification .far {
  font-size: 1.2em;
  flex-shrink: 0;
  opacity: 0.9;
}

#changeNameModal h2 {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.08));
  padding: 22px 28px;
  margin: 0;
  border-bottom: 1px solid rgba(99, 102, 241, 0.2);
  font-size: 1.3rem;
  color: #fff;
  font-weight: 700;
}

#changeNameModal form {
  padding: 24px 28px;
}

#changeNameModal label {
  display: block;
  margin-bottom: 10px;
  color: rgba(148, 163, 184, 0.9);
  font-weight: 600;
  font-size: 0.9rem;
}

#changeNameModal input[type="text"] {
  width: 100%;
  padding: 14px 16px;
  background: rgba(15, 15, 30, 0.6);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 12px;
  color: #fff;
  font-size: 1rem;
  transition: all 0.25s ease;
}

#changeNameModal input[type="text"]:focus {
  outline: none;
  border-color: #6366f1;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
  background: rgba(99, 102, 241, 0.08);
}

#changeNameModal button[type="submit"] {
  width: 100%;
  padding: 16px 24px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  border: none;
  border-radius: 14px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.25s ease;
  margin-top: 16px;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

#changeNameModal button[type="submit"]:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

#changeNameModal .close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: all 0.2s ease;
}

#changeNameModal .close:hover {
  background: rgba(239, 68, 68, 0.9);
  color: white;
  transform: scale(1.05);
}

#ouTooltip {
    position: fixed;
    top: 2.5rem;
    right: var(--space-md);
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    color: var(--text-primary);
    padding: 0;
    border-radius: 16px;
    min-width: 280px;
    max-width: 360px;
    z-index: 901;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(99, 102, 241, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(99, 102, 241, 0.15);
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px) scale(0.98);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: none;
    pointer-events: none;
}

#ouTooltip.show {
  display: block;
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

#ouTooltip .tooltip-header {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.1) 100%);
  padding: 12px 16px;
  font-weight: 600;
  font-size: 0.85rem;
  display: none;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(99, 102, 241, 0.1);
  color: var(--text-primary);
  position: relative;
}

#ouTooltip .tooltip-header::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, 
    transparent,
    rgba(255, 255, 255, 0.1) 50%,
    transparent);
}

#ouTooltip .tooltip-header .badge-count {
  background: var(--gradient-primary);
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 700;
  color: white;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

#ouTooltip .tooltip-content {
  padding: 12px;
  max-height: 320px;
  overflow-y: auto;
  background: transparent;
}

#ouTooltip .user-section {
  margin-bottom: 16px;
}

#ouTooltip .user-section:last-child {
  margin-bottom: 0;
}

#ouTooltip .section-title {
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0.8;
}

#ouTooltip .section-title .status-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
  animation: pulse 2s infinite;
}

#ouTooltip .section-title.connected .status-indicator {
  background: #10b981;
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
}

#ouTooltip .section-title.visitors .status-indicator {
  background: #94a3b8;
  box-shadow: 0 0 4px rgba(148, 163, 184, 0.4);
}

#ouTooltip .user-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  margin: 6px 0;
  background: rgba(42, 42, 62, 0.3);
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.08);
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  min-height: 44px;
}

#ouTooltip .user-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
    transparent,
    rgba(99, 102, 241, 0.05),
    transparent);
  transition: left 0.5s;
}

#ouTooltip .user-item:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.2);
  transform: translateX(2px);
}

#ouTooltip .user-item:hover::before {
  left: 100%;
}

#ouTooltip .user-item.authenticated {
  background: rgba(16, 185, 129, 0.06);
  border-color: rgba(16, 185, 129, 0.15);
}

#ouTooltip .user-item.visitor {
  background: rgba(42, 42, 62, 0.3);
  border-color: rgba(148, 163, 184, 0.08);
}

#ouTooltip .user-item.current {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.2);
  box-shadow: inset 0 0 12px rgba(99, 102, 241, 0.05);
}

#ouTooltip .user-item.authenticated::after,
#ouTooltip .user-item.current::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 60%;
  border-radius: 0 2px 2px 0;
}

#ouTooltip .user-item.authenticated::after {
  background: var(--accent-success);
}

#ouTooltip .user-item.current::after {
  background: var(--gradient-primary);
}

#ouTooltip .user-info {
  display: flex;
  align-items: center;
  min-width: 0;
}

#ouTooltip .user-name {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  line-height: 1.2;
  flex-wrap: nowrap;
}

#ouTooltip .user-item.current .user-name {
  color: #a78bfa;
}

#ouTooltip .user-badge {
  font-size: 0.65rem;
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
  padding: 1px 4px;
  border-radius: 4px;
  font-weight: 600;
  margin: 0;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  height: 18px;
}

#ouTooltip .user-activity {
  color: var(--text-muted);
  font-size: 0.7rem;
  background: rgba(15, 15, 35, 0.4);
  padding: 3px 8px;
  border-radius: 6px;
  opacity: 0.85;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  height: fit-content;
  margin-left: auto;
}

#ouTooltip .user-activity .fa-book-open {
  color: #10b981;
  font-size: 0.7rem;
}

#ouTooltip .user-activity .fa-compass {
  color: #94a3b8;
  font-size: 0.7rem;
}

/* Tooltip mobile pour l'activité quiz */
@keyframes tooltipFadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-5px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.activity-mobile-tooltip {
  pointer-events: none;
}

#ouTooltip .change-name-btn {
  background: transparent;
  color: var(--accent-primary);
  border: none;
  padding: 0 4px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  margin: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  line-height: 1;
  opacity: 0.7;
  height: 18px;
}

#ouTooltip .change-name-btn:hover {
  background: rgba(99, 102, 241, 0.1);
  opacity: 1;
  transform: scale(1.1);
}

#ouTooltip .empty-message {
  text-align: center;
  color: var(--text-muted);
  padding: 24px;
  font-size: 0.85rem;
  font-style: italic;
  opacity: 0.6;
}

#ouTooltip .user-section {
  animation: fadeInUp 0.3s ease;
  animation-fill-mode: both;
}

#ouTooltip .user-item {
  animation: fadeInUp 0.2s ease;
  animation-fill-mode: both;
}

#ouTooltip .user-item:nth-child(2) { animation-delay: 0.05s; }

#ouTooltip .user-item:nth-child(3) { animation-delay: 0.1s; }

#ouTooltip .user-item:nth-child(4) { animation-delay: 0.15s; }

#ouTooltip .user-item:nth-child(5) { animation-delay: 0.2s; }

#ouTooltip .tooltip-content::-webkit-scrollbar {
  width: 4px;
}

#ouTooltip .tooltip-content::-webkit-scrollbar-track {
  background: transparent;
}

#ouTooltip .tooltip-content::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.3);
  border-radius: 2px;
}

#ouTooltip .tooltip-content::-webkit-scrollbar-thumb:hover {
  background: rgba(99, 102, 241, 0.5);
}

/* Page loader - Styles complets pour fonctionner en dynamique aussi */
.page-loader {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #16213e 100%) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  z-index: 999999 !important;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.page-loader.hidden {
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  display: none !important;
}

.loader-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  animation: loaderFadeIn 0.6s ease-out;
}

.loader-brain {
  width: 150px;
  height: 150px;
  filter: drop-shadow(0 0 30px rgba(99, 102, 241, 0.4));
  animation: loaderFloat 3s ease-in-out infinite;
}

.loader-circuits {
  animation: loaderRotate 20s linear infinite;
  transform-origin: center;
}

.loader-data-point {
  animation: loaderPulsePoint 2s ease-in-out infinite;
}

.loader-data-point:nth-child(odd) {
  animation-delay: 0.5s;
}

.loader-neural-path {
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  animation: loaderDrawPath 3s ease-in-out infinite;
}

.loader-neural-path:nth-child(2) {
  animation-delay: 1.5s;
}

.loader-text {
  font-size: 18px;
  font-weight: 600;
  color: #a78bfa;
  letter-spacing: 2px;
  text-transform: uppercase;
  position: relative;
  animation: loaderTextPulse 1.5s ease-in-out infinite;
}

.loader-text::after {
  content: "";
  position: absolute;
  right: -30px;
  animation: loaderDots 1.5s steps(4, end) infinite;
}

.justify-start { justify-content: flex-start !important; }

.justify-center { justify-content: center !important; align-items: center;}

.container-with-sidebar {
  margin-left: var(--sidebar-width) !important;
}

.container-no-sidebar {
  margin-left: 0;
}

#pageLoader.hidden,
.page-loader.hidden {
  display: none !important;
  visibility: hidden !important;
  pointer-events: none !important;
  opacity: 0 !important;
  z-index: -9999 !important;
}

.sidebar {
  pointer-events: auto !important;
  z-index: 100 !important;
}

.sidebar * {
  pointer-events: auto !important;
}

.container {
  pointer-events: auto !important;
  position: relative;
  z-index: 1;
}

button,
a,
input,
select,
textarea,
[onclick],
[role="button"] {
  pointer-events: auto !important;
  cursor: pointer !important;
}

.visitor-mode-sidebar {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    transform: none !important;
    left: 0 !important;
    z-index: 100 !important;
    transition: none !important;
}

/* Afficher la sidebar uniquement quand authentifié */
html.auth-confirmed .sidebar {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* Ajuster la marge du container quand authentifié - Desktop uniquement */
@media (min-width: 769px) {
    html.auth-confirmed .container,
    html.visitor-mode .container {
        margin-left: var(--sidebar-width, 400px) !important;
    }
}

/* Cacher la sidebar par défaut (avant auth) */
html:not(.auth-confirmed):not(.visitor-mode) .sidebar {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
}

.form-control {
  width: 100%;
  padding: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
}

.form-text {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-muted);
  opacity: 0.8;
}

.co-owners-list {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.co-owners-list .text-muted {
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
  padding: 10px;
}

.visitor-message {
    margin: 0 0 20px 0;
    padding: 15px;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 12px;
}

.loader-visible {
  display: flex !important;
  visibility: visible !important;
  opacity: 1 !important;
  pointer-events: auto !important;
}

.loader-hidden {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.overlay-visible {
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
  z-index: 999 !important;
}

.overlay-hidden {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
  z-index: -9999 !important;
}

.d-none {
  display: none !important;
}

.d-block {
  display: block !important;
}

.d-flex {
  display: flex !important;
}

.opacity-100 {
  opacity: 1 !important;
}

.z-minus-9999 {
  z-index: -9999 !important;
}

12px;
    animation: fadeIn 0.5s ease-out;
}

.visitor-message-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    text-align: center;
}

.visitor-message-content i {
    font-size: 24px;
    color: #10b981;
    margin-bottom: 5px;
}

.visitor-message-content p {
    color: #d1fae5;
    font-size: 14px;
    line-height: 1.5;
    margin: 0 0 10px 0;
}

.visitor-buttons {
    display: flex;
    gap: 10px;
    margin-top: 5px;
    width: 100%;
}

.visitor-buttons button {
    flex: 1;
    padding: 8px 0;
    border-radius: 8px;
    font-weight: 500;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.visitor-buttons button:first-child {
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: #c7d2fe;
}

.visitor-buttons button:first-child:hover {
    background: rgba(99, 102, 241, 0.25);
    transform: translateY(-2px);
}

.visitor-buttons button:last-child {
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: #ddd6fe;
}

.visitor-buttons button:last-child:hover {
    background: rgba(139, 92, 246, 0.25);
    transform: translateY(-2px);
}

.search-public-input {
    padding: 0.5rem 1rem;
    background: var(--surface-card, rgba(26, 26, 46, 0.6));
    border: 1px solid var(--border-subtle, rgba(148, 163, 184, 0.2));
    border-radius: var(--radius-md, 12px);
    color: var(--text-primary, #f8fafc);
    font-size: 0.9rem;
    width: 200px;
    transition: all 0.2s;
}

.search-public-input:focus {
    outline: none;
    border-color: var(--primary, #6366f1);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.btn-add-to-directory {
    background: var(--success-dim, rgba(16, 185, 129, 0.15));
    color: var(--success, #10b981);
}

.btn-add-to-directory:hover {
    background: var(--success, #10b981);
    color: white;
    transform: scale(1.05);
}

.app-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.98) 0%, rgba(42, 42, 62, 0.95) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(99, 102, 241, 0.15);
  padding: 16px 24px;
  z-index: 99;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.powered-by {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  padding: 8px 16px;
  border-radius: 10px;
  position: relative;
  overflow: hidden;
}

.powered-by::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
  transition: left 0.6s;
}

.powered-by:hover {
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-2px);
}

.powered-by:hover::before {
  left: 100%;
}

.powered-by .developer-name {
  color: #a78bfa;
  font-weight: 600;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.powered-by i {
  color: #8b5cf6;
  font-size: 16px;
}

.profile-modal {
  position: relative;
}

.profile-photo-container {
  position: relative;
  display: inline-block;
  margin-bottom: 20px;
  z-index: 1;
}

.profile-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  object-fit: cover;
  transition: transform 0.3s ease;
}

.profile-photo:hover {
  transform: scale(1.05);
}

.profile-photo-ring {
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: 50%;
  background: linear-gradient(45deg, #6366f1, #8b5cf6, #a78bfa, #6366f1);
  background-size: 200% 200%;
  animation: gradient-rotate 3s linear infinite;
  z-index: -1;