:root {
  --primary-color: #6366f1;
  --primary-hover: #5855eb;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --background: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --border: #e2e8f0;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1),
    0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
}

.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 24px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
}

.logo i {
  font-size: 24px;
}

.sidebar-nav {
  flex: 1;
  padding: 24px 16px;
}

.nav-section h3 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 0 12px;
}

.nav-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 4px;
}

.nav-btn:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

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

.nav-btn i {
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: 24px;
  border-top: 1px solid var(--border);
}

.stats {
  display: flex;
  gap: 16px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.main-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 24px 32px;
}

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

.header-content h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  gap: 12px;
}

/* Content Sections */
.content-section {
  display: none;
  padding: 32px;
  flex: 1;
}

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

/* Accounts Grid */
.accounts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.account-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.account-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.account-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.account-info h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.account-info p {
  font-size: 14px;
  color: var(--text-secondary);
}

.account-actions {
  display: flex;
  gap: 8px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 14px;
}

.btn-icon.danger {
  background: #fef2f2;
  color: var(--danger-color);
}

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

.code-display {
  text-align: center;
  margin-bottom: 20px;
}

.totp-code {
  font-size: 32px;
  font-weight: 700;
  font-family: "Courier New", monospace;
  color: var(--primary-color);
  letter-spacing: 4px;
  margin-bottom: 12px;
  -webkit-user-select: all;
  user-select: all;
}

.timer-container {
  margin-bottom: 16px;
}

.timer-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.timer-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--success-color),
    var(--primary-color)
  );
  transition: width 1s linear;
  border-radius: 3px;
}

.timer-text {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

.copy-btn {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--primary-color);
  background: transparent;
  color: var(--primary-color);
  border-radius: var(--radius-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

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

.copy-btn.copied {
  background: var(--success-color);
  border-color: var(--success-color);
  color: white;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  max-width: 400px;
  margin: 0 auto;
}

.empty-icon {
  width: 80px;
  height: 80px;
  background: var(--surface-hover);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  color: var(--text-muted);
  font-size: 32px;
}

.empty-state h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* Backup Section */
.backup-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  max-width: 800px;
}

.backup-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}

.backup-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.backup-header i {
  font-size: 24px;
  color: var(--primary-color);
}

.backup-header h3 {
  font-size: 20px;
  font-weight: 600;
}

.backup-card p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.backup-card label,
.backup-card input[type="file"] {
  display: none;
}

/* Buttons */
.btn-primary,
.btn-secondary {
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--surface-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

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

/* Modal */
.modal {
  display: none;
  position: fixed;
  align-items: center;
  justify-content: center;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: 1000;
  animation: fadeIn 0.3s ease;
}

.modal.show {
  display: flex;
}

.modal-content {
  background: var(--surface);
  border-radius: var(--radius);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 24px 0;
  margin-bottom: 24px;
}

.modal-header h2 {
  font-size: 24px;
  font-weight: 600;
}

.modal-close {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--surface-hover);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: var(--border);
  color: var(--text-primary);
}

.modal-body {
  padding: 0 24px 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: all 0.2s ease;
  background: var(--surface);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group small {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-muted);
}

.form-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 32px;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 300px;
  animation: slideInRight 0.3s ease;
}

.toast.success {
  border-left: 4px solid var(--success-color);
}

.toast.error {
  border-left: 4px solid var(--danger-color);
}

.toast.warning {
  border-left: 4px solid var(--warning-color);
}

.toast-icon {
  font-size: 18px;
}

.toast.success .toast-icon {
  color: var(--success-color);
}

.toast.error .toast-icon {
  color: var(--danger-color);
}

.toast.warning .toast-icon {
  color: var(--warning-color);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 500;
  margin-bottom: 2px;
}

.toast-message {
  font-size: 14px;
  color: var(--text-secondary);
}

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

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

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

/* Responsive */
@media (max-width: 768px) {
  .app-container {
    flex-direction: column-reverse;
  }

  .sidebar {
    width: 100%;
    order: 2;
  }

  .main-content {
    order: 1;
  }

  .header-content {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }

  .content-section {
    padding: 20px;
  }

  .accounts-grid {
    grid-template-columns: 1fr;
  }

  .backup-container {
    grid-template-columns: 1fr;
  }

  .form-actions {
    flex-direction: column;
  }

  .toast {
    min-width: auto;
    width: calc(100vw - 40px);
  }
}