body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #f9f9f9;
    font-family: "Poppins", sans-serif;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 400px;
    text-align: center;
}

input {
    width: 100%;
    padding: 14px;
    font-size: 18px;
    text-align: center;
    border: 2px solid #ccc;
    border-radius: 10px;
    outline: none;
    transition: 0.3s;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

input:focus {
    border-color: #007bff;
}

.button-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.button-row button {
    flex: 1;
    padding: 12px;
    font-size: 16px;
    border-radius: 10px;
    border: 2px solid #007bff;
    background: white;
    color: #007bff;
    cursor: pointer;
    transition: 0.3s;
    margin: 0 5px;
    font-weight: 600;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
}

.button-row button.selected {
    background: #007bff;
    color: white;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.grid button {
    width: 100%;
    aspect-ratio: 1 / 1;
    font-size: 18px;
    font-weight: bold;
    border-radius: 10px;
    border: none;
    background: white;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: 0.2s;
}

.grid button:active {
    background: #ddd;
}

.full-width {
    width: 100%;
    box-sizing: border-box;
}