:root {
    --primary-color: #2563eb;
    --secondary-color: #1d4ed8;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --accent-bg: #f3f4f6;
    --spacing: 2rem;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing);
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

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

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
                url('https://images.unsplash.com/photo-1518186285589-2f7649de83e0?auto=format&fit=crop&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: white;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.9) 0%, rgba(29, 78, 216, 0.8) 100%);
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    padding: 0 1rem;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

.social-icon {
    font-size: 1.5rem;
    color: white;
    transition: color 0.3s ease, transform 0.3s ease;
}

.social-icon:hover {
    color: var(--accent-bg);
    transform: translateY(-3px);
}

/* Sections */
.section {
    padding: var(--spacing) 0;
}

.accent-section {
    background-color: var(--accent-bg);
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

/* Expertise Grid */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.expertise-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.expertise-item:hover {
    transform: translateY(-5px);
}

.expertise-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.expertise-item h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

/* Portfolio/Courses Grid */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.portfolio-item {
    background: white;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.portfolio-item:hover {
    transform: translateY(-5px);
}

.portfolio-content {
    padding: 1.5rem;
}

.portfolio-content h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.course-link {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.course-link:hover {
    background-color: var(--secondary-color);
}

/* Contact Section */
.contact-content {
    text-align: center;
    padding: 2rem 0;
}

.contact-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.contact-button {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.contact-button:hover {
    background-color: var(--secondary-color);
}

.contact-button.youtube {
    background-color: #ff0000;
}

.contact-button.youtube:hover {
    background-color: #cc0000;
}

/* Footer */
footer {
    background-color: var(--accent-bg);
    padding: 2rem 0;
    text-align: center;
    color: #4b5563;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 3rem;
    }

    .subtitle {
        font-size: 1.25rem;
    }

    .nav-content {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .contact-buttons {
        flex-direction: column;
    }
}