:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
    --header-height: 60px;
    --sidebar-width: 250px;
}



.container-fluid {
    padding: 0 1.5rem;
}

.sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(13, 110, 253, 0.05), rgba(13, 110, 253, 0.1));
    padding: 100px 0;
}

.hero-section h1 {
    color: var(--dark-color);
    margin-bottom: 1.5rem;
}

.hero-section .lead {
    color: var(--secondary-color);
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

/* Courses Section */
.course-card {
    transition: transform 0.3s ease;
    margin-bottom: 2rem;
}

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

.course-card .card-img-top {
    height: 200px;
    object-fit: cover;
}

/* About Section */
#about img {
    max-width: 100%;
    height: auto;
}

#about .list-unstyled li {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Contact Section */
#contact-form {
    transition: box-shadow 0.3s ease;
}

#contact-form:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15)!important;
}

#contact-form input,
#contact-form textarea {
    border: 1px solid #dee2e6;
    padding: 0.75rem;
}

#contact-form input:focus,
#contact-form textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* Footer */
.social-links a {
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--primary-color)!important;
}

/* Responsive Design */
@media (max-width: 991.98px) {
    .hero-section {
        padding: 60px 0;
    }

    .hero-section h1 {
        font-size: 2.5rem;
    }

    .navbar-nav .btn {
        margin: 0.5rem 0;
        width: 100%;
        text-align: center;
    }

    .navbar-nav {
        padding: 1rem 0;
    }

    .nav-item {
        margin-bottom: 0.5rem;
    }
}

@media (max-width: 767.98px) {
    .hero-section {
        text-align: center;
        padding: 40px 0;
    }

    .hero-section img {
        margin-top: 2rem;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-section .lead {
        font-size: 1.1rem;
    }

    #about .col-lg-6:first-child {
        margin-bottom: 2rem;
    }

    .social-links {
        margin-top: 1rem;
        text-align: center;
    }

    .footer h5 {
        margin-top: 1rem;
        text-align: center;
    }

    .footer p {
        text-align: center;
    }

    #contact-form {
        padding: 1.5rem !important;
    }
}