/* General Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f7f9fc;
    color: #333;
    line-height: 1.6;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, #42a5f5, #2196f3);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 50px;
    height: 50px;
}

h1 {
    font-size: 2.5rem;
    margin: 0;
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Main Content Styles */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.language-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

/* Language Card Styles */
.language-card {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.language-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.language-header {
    padding: 1rem;
    display: flex;
    align-items: center;
    background-color: #f0f8ff;
    border-bottom: 1px solid #e0e0e0;
}

.language-flag {
    width: 40px;
    height: 30px;
    margin-right: 1rem;
    object-fit: cover;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.language-name {
    font-size: 1.5rem;
    color: #333;
    font-weight: 600;
}

.lesson-list {
    list-style: none;
    padding: 1rem;
}

.lesson-item {
    margin-bottom: 0.8rem;
    border-radius: 6px;
    overflow: hidden;
}

.lesson-item:last-child {
    margin-bottom: 0;
}

.lesson-link {
    display: block;
    padding: 0.8rem 1rem;
    background-color: #f5f5f5;
    color: #333;
    text-decoration: none;
    border-left: 4px solid #2196f3;
    transition: background-color 0.2s ease;
}

.lesson-link:hover {
    background-color: #e3f2fd;
    border-left-color: #1976d2;
}

.lesson-number {
    display: inline-block;
    width: 24px;
    height: 24px;
    line-height: 24px;
    background-color: #2196f3;
    color: white;
    text-align: center;
    border-radius: 50%;
    margin-right: 0.5rem;
    font-size: 0.9rem;
}

/* Footer Styles */
footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
    background-color: #333;
    color: white;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .language-grid {
        grid-template-columns: 1fr;
    }
    
    header {
        padding: 1.5rem 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
}