/* Global Styles */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.navbar {
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* Main Content */
main {
  flex: 1;
  max-width: 800px;
  margin: 2rem auto;
  border-radius: 12px;
}

/* Form */
.card {
  background: linear-gradient(to bottom right, #ffffff, #f8fafc);
  border: 1px solid #e2e8f0;
  transition: all 0.3s ease;
}

card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
}

/* Todo Items */
.list-group-item {
  transition: background-color 0.2s ease;
  border-radius: 8px !important;
  margin-bottom: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.list-group-item.completed {
  background-color: #f1f5f9;
}

/* Footer */
footer {
  background-color: #ffffff;
  border-top: 1px solid #e2e8f0;
}

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

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

/* Responsive */
@media (max-width: 768px) {
  main {
    margin: 1rem;
    padding: 1.5rem !important;
  }
  
  .display-5 {
    font-size: 1.75rem;
  }
  
  footer .row > div {
    margin-bottom: 0.5rem;
  }
}

/* Utility Classes */
.bg-gradient {
  background: linear-gradient(120deg, #f8fafc 0%, #ffffff 100%);
}

.text-primary {
  color: #3b82f6 !important;
}

.btn-primary {
  background-color: #3b82f6;
  border-color: #3b82f6;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background-color: #2563eb;
  border-color: #2563eb;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(59, 130, 246, 0.2);
}

.btn-outline-danger {
  transition: all 0.2s ease;
}

.btn-outline-danger:hover {
  transform: scale(1.05);
}

.form-control:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 0.25rem rgba(59, 130, 246, 0.25);
}

/* Custom Checkbox */
.form-check-input:checked {
  background-color: #10b981;
  border-color: #10b981;
}

.form-check-input:checked[type=checkbox] {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/%3e%3c/svg%3e");
}