body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(to bottom, #f5f7fa, #c3cfe2);
    color: #333;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    display: flex;
    flex-wrap: wrap;
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.main-content {
    flex: 1 1 70%;
    padding: 20px;
    box-sizing: border-box;
}

.sidebar {
    flex: 1 1 30%;
    padding: 20px;
    background: #f7f7f7;
    box-sizing: border-box;
    border-left: 1px solid #ddd;
}

h1, h2, h3 {
    color: #1a73e8;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
    gap: 10px;
    margin: 20px auto;
}

.cell {
    padding: 10px;
    text-align: center;
    border-radius: 5px;
    background-color: #e3f2fd;
    color: #0d47a1;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

select, button {
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    margin: 10px 0;
    cursor: pointer;
    transition: background 0.3s;
}

select {
    background: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

button {
    background: #1a73e8;
    color: white;
}

button:hover {
    background: #155cb0;
}

.result-container {
    margin-top: 20px;
    text-align: center;
}

.highlight {
    margin: 20px auto;
    padding: 15px;
    font-size: 1em;
    background: #ffeb3b;
    color: #333;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.highlight b {
    color: #c62828;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        border-left: none;
        border-top: 1px solid #ddd;
    }
}