body, html {
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
    color: white;
    scroll-behavior: smooth;
}

.background {
    background-image: url('https://i.postimg.cc/jqDQpbWC/e609bd1a87f9a60769b0629431f04554.jpg');
    background-size: cover;
    background-position: center;
    min-height: 100vh;
    background-attachment: fixed;
}

header {
    background-color: rgba(0, 0, 0, 0.7);
    padding: 20px;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #4CAF50;
}

.company-description {
    background-color: rgba(0, 0, 0, 0.6);
    padding: 40px;
    text-align: center;
}

.services-overview {
    display: flex;
    justify-content: space-around;
    margin-top: 30px;
}

.service {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    width: 25%;
    transition: transform 0.3s ease;
}

.about-company ul {
    list-style-type: none;
    padding: 0;
}

.about-company li {
    margin-bottom: 10px;
    color: #e0e0e0;
}

.contact-form {
    display: flex;
    flex-direction: column;
    max-width: 500px;
    margin: 0 auto;
    gap: 15px;
}

.contact-form input, 
.contact-form textarea {
    padding: 10px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid #4CAF50;
    color: white;
}

.contact-form button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.contact-form button:hover {
    background-color: #45a049;
}

.about-company {
    margin-top: 40px;
}

.particles-background {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-section {
    text-align: center;
    padding: 50px 0;
    position: relative;
}

.cta-button {
    display: inline-block;
    background-color: #4CAF50;
    color: white;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #45a049;
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
}

.service-icon svg {
    fill: white;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 30px;
}

.team-stats {
    display: flex;
    gap: 20px;
}

.stat {
    text-align: center;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 10px;
}

.stat-number {
    display: block;
    font-size: 2em;
    color: #4CAF50;
}

.projects-showcase {
    margin-top: 50px;
}

.project-grid {
    display: flex;
    gap: 20px;
}

.project {
    flex: 1;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.project img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.project-details {
    padding: 15px;
}

.form-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.form-guarantee {
    display: flex;
    align-items: center;
    gap: 10px;
}

footer {
    background-color: rgba(0, 0, 0, 0.8);
    padding: 20px;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    color: white;
    text-decoration: none;
}

.tech-solutions {
    margin-top: 50px;
    text-align: center;
}

.solutions-grid {
    display: flex;
    justify-content: space-around;
    gap: 20px;
    margin-top: 30px;
}

.solution {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    width: 30%;
    transition: transform 0.3s ease;
}

.solution:hover {
    transform: scale(1.05);
}

.solution-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
}

.solution-icon svg {
    fill: white;
    width: 100%;
    height: 100%;
}

.solution h4 {
    margin-bottom: 10px;
    color: #4CAF50;
}

.testimonials-section {
    margin-top: 50px;
    text-align: center;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.testimonial {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    transition: transform 0.3s ease;
}

.testimonial:hover {
    transform: scale(1.03);
}

.testimonial-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.testimonial-content p {
    flex-grow: 1;
    font-style: italic;
    margin-bottom: 15px;
}

.testimonial-author {
    text-align: left;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 15px;
}

.testimonial-author h4 {
    margin: 0;
    color: #4CAF50;
}

.testimonial-author span {
    font-size: 0.8em;
    color: #e0e0e0;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1500;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.7);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: rgba(30, 30, 30, 0.95);
    margin: 10% auto;
    padding: 30px;
    border-radius: 10px;
    max-width: 500px;
    position: relative;
    color: white;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.close-modal {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-modal:hover {
    color: #4CAF50;
}

@keyframes fadeIn {
    from {opacity: 0;}
    to {opacity: 1;}
}

/* Add styles for footer contacts link */
.footer-contacts {
    margin-top: 15px;
}

.contacts-link {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

.contacts-link:hover {
    color: #4CAF50;
}

/* Mobile Responsiveness Improvements */
@media screen and (max-width: 768px) {
    body {
        font-size: 14px;
    }

    /* Header and Navigation */
    header {
        padding: 10px;
    }

    nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .logo h1 {
        font-size: 1.5em;
        text-align: center;
        width: 100%;
    }

    .top-contact-bar {
        flex-direction: column;
        align-items: center;
        padding: 10px;
    }

    .top-contact-bar a {
        margin: 5px 0;
    }

    /* Navigation Menu */
    .nav-menu {
        width: 100%;
        display: none;
        background-color: rgba(0, 0, 0, 0.9);
        position: absolute;
        top: 100%;
        left: 0;
        padding: 10px;
        z-index: 1000;
    }

    .nav-menu.active {
        display: flex;
        flex-direction: column;
    }

    .nav-menu a {
        padding: 10px;
        text-align: center;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* Services */
    .services-overview {
        flex-direction: column;
        align-items: stretch;
    }

    .service {
        width: 100%;
        margin-bottom: 20px;
        padding: 15px;
    }

    /* About Company */
    .about-content {
        flex-direction: column;
        text-align: center;
    }

    .team-stats {
        flex-direction: column;
        gap: 10px;
    }

    /* Projects */
    .project-grid {
        flex-direction: column;
    }

    .project {
        width: 100%;
        margin-bottom: 20px;
    }

    /* Tech Solutions */
    .solutions-grid {
        flex-direction: column;
    }

    .solution {
        width: 100%;
        margin-bottom: 20px;
    }

    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }

    .social-links {
        justify-content: center;
    }

    /* Cartoon Builder Banner */
    .cartoon-builder-banner {
        width: 100px;
        right: 10px;
        bottom: 10px;
    }

    .builder-character {
        width: 60px;
        height: 90px;
    }

    .builder-message {
        display: none; /* Hide message on mobile to save space */
    }

    /* Particles Background */
    #particles-js {
        display: none; /* Optional: remove on mobile for performance */
    }
}

/* Ensure all images are responsive */
img {
    max-width: 100%;
    height: auto;
}

/* Improve touch targets */
a, button {
    min-height: 44px;
    min-width: 44px;
    touch-action: manipulation;
}

/* Prevent text scaling on orientation change */
html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}
```
Note: I have added the CSS styles as per the plan provided. I have also made sure that the existing styles are preserved and not overwritten unless specified in the plan. If there are any conflicts between the existing styles and the plan, I have given preference to the plan's version.