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

:root {
    --primary-blue: #003d7a;
    --light-blue: #0055b8;
    --accent-color: #ff6b35;
    --text-color: #333;
    --light-bg: #f5f5f5;
    --white: #ffffff;
    --border-color: #ddd;
}

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

/* Navigation */
.navbar {
    background-color: var(--primary-blue);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--white);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    transition: color 0.3s;
    letter-spacing: 1px;
}

.nav-link:hover {
    color: var(--accent-color);
}

.cart-link {
    font-size: 0.85rem;
}

.dashboard {
    background-color: var(--light-blue);
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 700;
}

.dashboard:hover {
    background-color: var(--accent-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, rgba(0, 61, 122, 0.9), rgba(0, 85, 184, 0.9)), 
                url('https://via.placeholder.com/1200x500/003d7a/ffffff?text=eLearning+Courses') center/cover;
    background-attachment: fixed;
    color: var(--white);
    padding: 8rem 2rem;
    text-align: center;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    font-weight: 400;
    letter-spacing: 1px;
}

.hero-content h1 {
    font-size: 4.5rem;
    margin-bottom: 2.5rem;
    font-weight: 700;
    letter-spacing: 3px;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* Buttons */
.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--white);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.btn-primary:hover {
    background-color: #e55a2a;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

.btn-secondary {
    background-color: var(--light-blue);
    color: var(--white);
}

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

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

/* Content Section */
.content-wrapper {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.section-title {
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-blue);
    text-align: center;
    font-weight: 700;
    letter-spacing: 1px;
}

.section-subtitle {
    font-size: 1.05rem;
    text-align: center;
    max-width: 900px;
    margin: 0 auto 3rem;
    color: #666;
    line-height: 1.7;
}

.company-info {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.info-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}

.info-text p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.info-image {
    text-align: center;
}

.logo-portrait {
    max-width: 200px;
    height: auto;
    border-radius: 8px;
}

.info-text a {
    color: var(--light-blue);
    text-decoration: none;
}

.info-text a:hover {
    text-decoration: underline;
}

/* Popular Courses Section */
.popular-courses {
    padding: 4rem 0;
    background-color: var(--white);
}

.section-heading {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-blue);
    text-align: center;
}

.course-card {
    background-color: var(--light-bg);
    border-left: 4px solid var(--light-blue);
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 4px;
    transition: transform 0.3s, box-shadow 0.3s;
    align-items: start;
}

.course-card:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.course-image {
    width: 100%;
    height: 200px;
    border-radius: 4px;
    overflow: hidden;
    background-color: var(--white);
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.course-card:hover .course-image img {
    transform: scale(1.05);
}

.course-content h4 {
    color: var(--primary-blue);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.course-content p {
    margin-bottom: 1.5rem;
    color: #666;
}

/* Services Section */
.services {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.services-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.services-list li a {
    display: block;
    padding: 1.5rem;
    background-color: var(--white);
    border-radius: 4px;
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
    text-align: center;
}

.services-list li a:hover {
    background-color: var(--light-blue);
    color: var(--white);
    transform: translateY(-5px);
    border-color: var(--light-blue);
}

/* Footer */
.footer {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--accent-color);
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.95rem;
}

.footer-column a:hover {
    color: var(--accent-color);
}

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

.social-links a {
    padding: 0.5rem 1rem;
    border: 1px solid var(--white);
    border-radius: 4px;
    display: inline-block;
}

.social-links a:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 2rem;
    text-align: center;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        flex-direction: column;
        align-items: stretch;
    }

    .nav-link {
        padding: 0.5rem;
    }

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

    .hero-content h2 {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-heading {
        font-size: 1.5rem;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }

    .course-card {
        grid-template-columns: 1fr;
    }

    .info-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 1rem;
        flex-wrap: wrap;
    }

    .logo {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .logo-img {
        height: 30px;
    }

    .logo h1 {
        font-size: 1.3rem;
    }

    .nav-menu {
        width: 100%;
        gap: 0.5rem;
    }

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

    .hero-content p {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.6rem 1.5rem;
        font-size: 0.9rem;
    }

    .logo-portrait {
        max-width: 150px;
    }
}