body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: #333;
}

.container {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

h1 {
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

select, input {
    width: 100%;
    box-sizing: border-box;
    padding: 0.8rem;
    margin: 0.8rem 0;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

select:focus, input:focus {
    border-color: #4a90e2;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
    outline: none;
}

button {
    width: 100%;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 10px;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    margin-top: 1rem;
}

button:hover {
    background-color: #357abd;
}

button:active {
    transform: scale(0.98);
}

#result {
    margin-top: 2rem;
    padding: 1rem;
    border-radius: 8px;
    background-color: #f8f9fa;
    font-size: 1.25rem;
    font-weight: 600;
    color: #2e7d32;
    min-height: 1.5rem;
}