:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #00d2ff;
    --bg-light: #ffffff;
    --text-light: #333333;
    --card-light: #f8f9fa;
    --bg-dark: #121212;
    --text-dark: #e0e0e0;
    --card-dark: #1e1e1e;
    --transition: all 0.3s ease;
}

body.light-mode {
    --bg: var(--bg-light);
    --text: var(--text-light);
    --card-bg: var(--card-light);
    --nav-bg: rgba(255, 255, 255, 0.95);
}

body.dark-mode {
    --bg: var(--bg-dark);
    --text: var(--text-dark);
    --card-bg: var(--card-dark);
    --nav-bg: rgba(18, 18, 18, 0.95);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    padding: 1rem 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    color: var(--text);
}

.logo img {
    height: 45px;
    width: auto;
}

.highlight-text {
    color: var(--primary-color);
}

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

.nav-links li { margin-left: 2rem; }

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

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

.theme-btn {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?auto=format&fit=crop&q=80&w=1200');
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.highlight { color: var(--accent-color); }

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}

.btn.primary {
    background: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
}

.btn.primary:hover {
    background: transparent;
    color: var(--primary-color);
}

.btn.secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
    margin-left: 1rem;
}

.btn.secondary:hover {
    background: white;
    color: black;
}

/* Section Common */
section { padding: 5rem 0; }

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    margin: 10px auto;
}

/* Services */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--card-bg);
    padding: 3rem 2rem;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.service-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    transition: var(--transition);
}

.project-img {
    height: 250px;
    background-size: cover;
    background-position: center;
}

.project-info { padding: 1.5rem; }

.project-card:hover { transform: scale(1.02); }

/* Clients */
.clients-flex {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    opacity: 0.7;
}

.client-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    padding: 1rem;
    border: 2px solid transparent;
    transition: var(--transition);
}

.client-logo:hover {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

/* Testimonials */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    border-left: 5px solid var(--primary-color);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
}

.testimonial-card p {
    font-style: italic;
    margin-bottom: 1rem;
}

.testimonial-card h4 {
    color: var(--primary-color);
    font-weight: 600;
}

/* Contact */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h3 { margin-bottom: 1.5rem; }
.contact-info p { margin-bottom: 1rem; }
.contact-info i {
    color: var(--primary-color);
    margin-right: 10px;
}

.contact-form {
    display: flex;
    flex-direction: column;
}

.contact-form input, .contact-form textarea {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border: 1px solid #ddd;
    background: var(--card-bg);
    color: var(--text);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    background: var(--card-bg);
    border-top: 1px solid rgba(0,0,0,0.1);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .contact-wrapper { grid-template-columns: 1fr; }
    .nav-links { display: none; }
}