body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #1a1a1a;
    color: #f2f2f2;
    margin: 0;
    padding: 0;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

#container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    gap: 30px;
}

h1 {
    font-size: 2.5rem;
    color: #ffd700;
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
    text-align: center;
}

#lock_icon {
    font-size: 4rem; 
    color: #ffd700; 
    text-align: center;
    display: block; 
    margin: 20px 0; 
}
#copy_icon {
    font-size: 1.2rem;
    color: #1a1a1a;
    margin-left: 8px; 
}
#password_container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #333;
    padding: 16px 20px;
    border-radius: 16px;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
    transition: box-shadow 0.3s ease;
    word-break: break-word;
}

#password_container:hover {
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
}

#password {
    color: #ffd700;
    font-size: 1.4rem;
}

#password_items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    justify-items: center;
    align-items: center;
    width: 100%;
    max-width: 480px;
}

.item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

label {
    font-size: 1rem;
    color: #f2f2f2;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #ffd700;
}

input[type="number"] {
    width: 80px;
    padding: 8px;
    background-color: #1a1a1a;
    color: #f2f2f2;
    border: 2px solid #ffd700;
    border-radius: 12px;
    font-size: 1rem;
}

#generate {
    grid-column: span 2;
    background-color: #ffd700;
    color: #1a1a1a;
    font-size: 1.1rem;
    padding: 12px 20px;
    font-weight: 600;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

#generate:hover {
    background-color: #e5c100;
    transform: scale(1.07);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    #password_container {
        flex-direction: column;
        align-items: flex-start;
    }

    button {
        width: 100%;
        margin-top: 10px;
    }

    #password_items {
        grid-template-columns: 1fr;
        gap: 10px;
    }
}