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

.lessons-header {
    text-align: center;
    margin-bottom: 3rem;
}

.lessons-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(45deg, #fff, #ccc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lessons-header p {
    font-size: 1.2rem;
    color: #999;
    margin-bottom: 0;
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.lesson-card {
    background: #1a1a1a;
    border: 1px solid #333;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.lesson-card:hover {
    transform: translateY(-5px);
    border-color: #555;
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.1);
}

.lesson-card:hover::before {
    opacity: 1;
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: all 0.6s ease;
    opacity: 0;
}

.lesson-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.lesson-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #fff;
}

.lesson-card p {
    color: #ccc;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.lesson-difficulty {
    margin-top: auto;
}

.difficulty {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty.beginner {
    background: #1e7e34;
    color: #fff;
}

.difficulty.intermediate {
    background: #fd7e14;
    color: #fff;
}

.difficulty.advanced {
    background: #dc3545;
    color: #fff;
}

.lesson-tips {
    margin-top: 4rem;
}

.lesson-tips h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: #fff;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.tip-card {
    background: #1a1a1a;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
}

.tip-card h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #fff;
}

.tip-card p {
    color: #ccc;
    line-height: 1.5;
    margin: 0;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: #1a1a1a;
    margin: 5% auto;
    padding: 0;
    border: 1px solid #333;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid #333;
}

.modal-header h2 {
    margin: 0;
    color: #fff;
    font-size: 1.5rem;
}

.close {
    color: #999;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: #fff;
}

.modal-body {
    padding: 2rem;
}

.modal-body p {
    color: #ccc;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.lesson-preview h4 {
    color: #fff;
    margin-bottom: 1rem;
}

#lessonWords {
    background: #0a0a0a;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1rem;
    color: #ccc;
    font-family: 'JetBrains Mono', monospace;
    line-height: 1.6;
    max-height: 150px;
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem 2rem;
    border-top: 1px solid #333;
}

.btn-primary {
    background: #fff;
    color: #000;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: #f0f0f0;
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: #ccc;
    border: 1px solid #555;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: #333;
    color: #fff;
    border-color: #666;
}

@media (max-width: 768px) {
    .lessons-container {
        padding: 1rem;
    }
    
    .lessons-header h1 {
        font-size: 2rem;
    }
    
    .lessons-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .lesson-card {
        padding: 1.5rem;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 1rem;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lessons-container > * {
    animation: fadeInUp 0.6s ease forwards;
}

.lesson-card:nth-child(1) { animation-delay: 0.1s; }
.lesson-card:nth-child(2) { animation-delay: 0.2s; }
.lesson-card:nth-child(3) { animation-delay: 0.3s; }
.lesson-card:nth-child(4) { animation-delay: 0.4s; }
.lesson-card:nth-child(5) { animation-delay: 0.5s; }
.lesson-card:nth-child(6) { animation-delay: 0.6s; }