:root {
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --secondary-color: #8b5cf6;
  --accent-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --success-color: #10b981;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

/* Navigation */
.navbar {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand h2 {
  color: var(--primary-color);
  font-weight: 700;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-info {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

.btn:focus {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

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

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

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

.btn-danger:hover {
  background: #dc2626;
}

.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

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

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

.btn-icon.btn-danger:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
}

/* Auth Container */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.auth-card {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.auth-header p {
  color: var(--text-secondary);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--bg-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Checkbox styling */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  font-weight: 400;
  margin-bottom: 0;
}

.checkbox-label input[type="checkbox"] {
  width: auto;
  margin: 0;
  accent-color: var(--primary-color);
}

.checkbox-text {
  color: var(--text-primary);
  font-size: 0.875rem;
}

.form-help {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.month-day-inputs {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.month-day-row {
  display: flex;
  gap: 1rem;
}

.month-day-field {
  flex: 1;
}

.month-day-field label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.month-day-field select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
}

.month-day-field select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Dashboard */
.dashboard {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.dashboard-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.dashboard-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
  min-width: 250px;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input::placeholder {
  color: var(--text-light);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  color: var(--text-light);
  pointer-events: none;
}

/* Reminders Container */
.reminders-container {
  position: relative;
}

.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.no-reminders {
  text-align: center;
  padding: 4rem 2rem;
}

.no-reminders-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.no-reminders-content p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Reminders List - List View */
.reminders-list {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.reminder-item {
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.reminder-item:last-child {
  border-bottom: none;
}

.reminder-item:hover {
  background: var(--bg-secondary);
}

.reminder-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  gap: 1rem;
}

.reminder-info {
  flex: 1;
  min-width: 0;
}

.reminder-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.reminder-details {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.reminder-birthday {
  font-weight: 500;
}

.reminder-age {
  color: var(--primary-color);
  font-weight: 500;
}

.reminder-next-date {
  color: var(--text-light);
}

.reminder-no-age {
  color: var(--text-light);
  font-style: italic;
}

.reminder-status-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.reminder-status {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
  min-width: 80px;
}

.status-today {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
  animation: pulse 2s infinite;
}

.status-tomorrow {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success-color);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-this-week {
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary-color);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.status-this-month {
  background: rgba(139, 92, 246, 0.15);
  color: var(--secondary-color);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.status-upcoming {
  background: rgba(107, 114, 128, 0.1);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

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

.reminder-actions {
  display: flex;
  gap: 0.5rem;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 0.5rem;
  border-radius: var(--radius);
  transition: var(--transition);
}

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

.reminder-form {
  padding: 1.5rem;
}

.modal-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  margin-top: 2rem;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Error Messages */
.error-message {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
  padding: 0.75rem;
  border-radius: var(--radius);
  margin-top: 1rem;
  font-size: 0.875rem;
}

.success-message {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success-color);
  padding: 0.75rem;
  border-radius: var(--radius);
  margin-top: 1rem;
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .dashboard-header {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }

  .dashboard-header h1 {
    text-align: center;
  }

  .dashboard-actions {
    flex-direction: column;
    gap: 1rem;
  }

  .search-input {
    min-width: auto;
    width: 100%;
  }

  .reminder-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .reminder-status-container {
    width: 100%;
    justify-content: space-between;
  }

  .reminder-details {
    flex-direction: column;
    gap: 0.5rem;
  }

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

  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }
}

@media (max-width: 480px) {
  .auth-card {
    padding: 1.5rem;
  }

  .dashboard {
    padding: 1rem;
  }

  .reminder-content {
    padding: 1rem;
  }

  .modal-content {
    margin: 1rem;
    max-height: calc(100vh - 2rem);
  }

  .reminder-actions {
    flex-direction: row;
    gap: 0.25rem;
  }
}

/* Focus styles for accessibility */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Text selection */
::selection {
  background: rgba(59, 130, 246, 0.2);
}