:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --text-color: #333;
    --bg-color: #f4f4f4;
    --white: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.hero {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 150px 0 100px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    margin-top: 30px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #2980b9;
}

.section {
    padding: 100px 0;
}

.section-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
}

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

.about-text {
    flex: 1;
    padding-right: 50px;
}

.about-image {
    flex: 1;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
}

.specialties {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.specialty-item {
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.specialty-item i {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.portfolio {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    border-radius: 10px;
}

.portfolio-item img {
    width: 100%;
    display: block;
    transition: transform 0.3s ease;
}

.portfolio-item:hover img {
    transform: scale(1.1);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(52, 152, 219, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-overlay h3 {
    color: var(--white);
    font-size: 24px;
}

footer {
    background-color: var(--secondary-color);
    color: var(--white);
    text-align: center;
    padding: 30px 0;
}

/* Styles for new functionality */
.filter-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.filter-button {
    background-color: var(--bg-color);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 10px 20px;
    margin: 0 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-button.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.contact-form {
    max-width: 500px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.form-group textarea {
    height: 150px;
}

.error-message {
    color: red;
    font-size: 14px;
    margin-top: 5px;
}

#dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 50%;
}

.load-more {
    display: block;
    margin: 20px auto;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.load-more:hover {
    background-color: #2980b9;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f4f4f4;
    --white: #2c3e50;
}

body.dark-mode .specialty-item,
body.dark-mode .portfolio-item,
body.dark-mode .contact-form input,
body.dark-mode .contact-form textarea {
    background-color: #2c3e50;
    color: #f4f4f4;
}

body.dark-mode .nav-links a,
body.dark-mode .section-title,
body.dark-mode .specialty-item h3 {
    color: #f4f4f4;
}

body.dark-mode .portfolio-overlay {
    background-color: rgba(52, 152, 219, 0.9);
}

/* Utility classes for animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive design adjustments */
@media screen and (max-width: 768px) {
    .about-content {
        flex-direction: column;
    }

    .about-text, .about-image {
        flex: 1 0 100%;
        padding-right: 0;
        margin-bottom: 30px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
        font-size: 24px;
        color: var(--primary-color);
        cursor: pointer;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    .nav-links.active li {
        margin: 10px 0;
    }
}

/* Accessibility improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles for better keyboard navigation */
a:focus, button:focus, input:focus, textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .no-print {
        display: none;
    }

    body {
        font-size: 12pt;
    }

    a[href]:after {
        content: " (" attr(href) ")";
    }
}


.highlight-section {
    background-color: #f9f9f9;
    padding: 80px 0;
    text-align: center;
}

.highlight-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 800px;
    margin: 0 auto;
}

.highlight-text {
    margin-bottom: 30px;
}

.highlight-text h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.highlight-text p {
    margin-bottom: 30px;
}

.highlight-image {
    margin-bottom: 30px;
}

.highlight-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #2980b9;
}

@media (min-width: 768px) {
    .highlight-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .highlight-text {
        flex: 1;
        text-align: left;
        padding-right: 40px;
        margin-bottom: 0;
    }

    .highlight-image {
        flex: 1;
        margin-bottom: 0;
    }
}