:root {
    --background-color: #f8f9fa;
    --text-color: #333;
    --primary-color: #007bff;
    --white: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23d9d9d9' fill-opacity='0.1'%3E%3Cpath d='M0 38.59l2.83-2.83 1.41 1.41L1.41 40H0v-1.41zM0 1.4l2.83 2.83 1.41-1.41L1.41 0H0v1.41zM38.59 40l-2.83-2.83 1.41-1.41L40 38.59V40h-1.41zM40 1.41l-2.83 2.83-1.41-1.41L38.59 0H40v1.41zM20 18.59l2.83-2.83 1.41 1.41L21.41 20l2.83 2.83-1.41 1.41L20 21.41l-2.83 2.83-1.41-1.41L18.59 20l-2.83-2.83 1.41-1.41L20 18.59z'/%3E%3C/g%3E%3C/svg%3E");
}

header {
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
}

main {
    container-type: inline-size;
    width: 100%;
    max-width: 600px;
    text-align: center;
}

p {
    font-size: 1.125rem;
    line-height: 1.6;
}

#generate-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.25rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 6px var(--shadow-color), 0 1px 3px var(--shadow-color);
}

#generate-btn:hover {
    background-color: #0056b3;
}

#generate-btn:active {
    transform: translateY(2px);
}

#numbers-container {
    margin-top: 2rem;
}

lotto-numbers .number {
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

@container (max-width: 400px) {
    h1 {
        font-size: 2rem;
    }

    #generate-btn {
        width: 100%;
        font-size: 1rem;
    }

    lotto-numbers .number {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}