:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --text-color: #334155;
    --text-light: #64748b;
}

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

.navbar {
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    background-color: white !important;
}

.navbar-brand img {
    height: 50px;
    width: auto;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-color) !important;
    margin: 0 0.5rem;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

.nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    border-radius: 8px;
}

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

/* Hero Section */
.course-hero {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 4rem 0;
    text-align: center;
}

.course-hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.course-hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 2rem;
}

/* Course Cards */
.course-card {
    border: none;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    margin-bottom: 2rem;
    height: 100%;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.course-img {
    height: auto;
    width: 100px;
}

.course-body {
    padding: 1.5rem;
}

.course-category {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.course-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.course-meta {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.course-meta span {
    display: flex;
    align-items: center;
    margin-right: 1rem;
}

.course-meta i {
    margin-right: 0.3rem;
}

.course-desc {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid #e2e8f0;
}

.course-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark-color);
}

.course-price small {
    font-size: 0.9rem;
    color: var(--text-light);
    text-decoration: line-through;
    margin-left: 0.5rem;
}

/* Newsletter */
.newsletter-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.newsletter-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.newsletter-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

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

.newsletter-input {
    width: 100%;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
}

.newsletter-input:focus {
    outline: none;
}

.newsletter-btn {
    background-color: white;
    color: var(--primary-color);
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    margin-top: 1rem;
    transition: all 0.3s;
}

.newsletter-btn:hover {
    background-color: #e2e8f0;
    color: var(--secondary-color);
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-logo {
    height: 50px;
    margin-bottom: 1.5rem;
}

.footer-about {
    margin-bottom: 2rem;
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
    padding-left: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.social-icons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #334155;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.social-icon:hover {
    background-color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 2rem;
    margin-top: 2rem;
    text-align: center;
    color: #94a3b8;
}

/* Responsive Adjustments */
@media (max-width: 992px) {
    .course-hero-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }
    
    .course-hero {
        padding: 3rem 0;
    }
    
    .course-hero-title {
        font-size: 1.75rem;
    }
    
    .course-hero-subtitle {
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .course-card {
        max-width: 320px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .course-footer {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .course-footer .btn {
        margin-top: 1rem;
        width: 100%;
    }
}