body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.container {
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
}

h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.formula {
    background-color: white;
    padding: 1rem 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 2rem 0;
    font-size: 1.5rem;
    color: #34495e;
}

.buttons-container {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
    justify-content: center;
    align-items: center;
}

.button {
    padding: 1rem 2rem;
    font-size: 1.2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: white;
}

.button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.learn {
    background-color: #3498db;
}

.practice {
    background-color: #2ecc71;
}

.description {
    max-width: 600px;
    margin: 2rem auto;
    color: #34495e;
    line-height: 1.6;
}

.home-link {
    position: absolute;
    top: 1rem;
    left: 1rem;
    text-decoration: none;
    color: #2c3e50;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.footer {
    position: fixed;
    bottom: 10px;
    right: 10px;
    font-size: 0.8em;
    color: rgba(44, 62, 80, 0.5);
    font-style: italic;
}