body {
            box-sizing: border-box;
        }

        /* Green color scheme */
        .bg-primary-custom {
            background: linear-gradient(135deg, #059669, #0891b2);
        }
        
        .text-primary-custom {
            color: #059669;
        }

        /* Simple animations */
        .card:hover {
            transform: translateY(-2px);
            transition: 0.3s;
        }

        .btn:hover {
            transform: scale(1.05);
            transition: 0.2s;
        }

        /* Hide pages by default */
        .page {
            display: none;
        }

        .page.active {
            display: block;
        }

        /* Timer display */
        .timer {
            font-size: 3rem;
            font-weight: bold;
            color: #059669;
        }

        /* CSS for bounce animation */
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-15px);
  }
  60% {
    transform: translateY(-8px);
  }
}

/* Apply animation to the button */
#get-started {
  cursor: pointer;
  transition: transform 0.2s;
  animation: bounce 2s infinite; /* Bounce effect */
}

/* Optional: hover effect */
#get-started:hover {
  transform: scale(1.05);
}


        /* Simple flashcard */
        .flashcard {
            height: 200px;
            cursor: pointer;
            border: 2px solid #059669;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(45deg, #059669, #0891b2);
            color: white;
            font-size: 1.2rem;
            margin: 10px 0;
        }

        .flashcard.flipped {
            background: linear-gradient(45deg, #0891b2, #7c2d12);
        }

        /* Error messages */
        .error {
            color: #dc2626;
            font-size: 0.9rem;
            display: none;
        }

        .success {
            color: #059669;
            font-size: 0.9rem;
            display: none;
        }

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

        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-10px); }
            60% { transform: translateY(-5px); }
        }

        .fade-in {
            animation: fadeIn 1s ease-in;
        }

        .bounce {
            animation: bounce 2s infinite;
        }

        /* Responsiveness */
        @media (max-width: 768px) {
            .timer {
                font-size: 2rem;
            }
            
            .btn-lg {
                font-size: 1rem;
                padding: 0.5rem 1rem;
            }
        }

        @media (max-width: 576px) {
            .timer {
                font-size: 1.5rem;
            }
            
            .card-body {
                padding: 1rem;
            }
        }
    /* Dark Mode Styles */
body.dark-mode {
    background-color: #121212;
    color: #f1f1f1;
}

body.dark-mode .card {
    background-color: #1e1e1e;
    color: #f1f1f1;
}

body.dark-mode .navbar {
    background-color: #1a1a1a !important;
}

body.dark-mode .table {
    color: #f1f1f1;
}

body.dark-mode .table-striped > tbody > tr:nth-of-type(odd) {
    background-color: #2a2a2a;
}