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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo h2 {
    color: #0056d3;
    font-weight: 700;
    font-size: 1.8rem;
}

.search-container {
    position: relative;
    max-width: 400px;
    width: 100%;
}

.search-input {
    width: 100%;
    padding: 12px 45px 12px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
}

.search-input:focus {
    border-color: #0056d3;
    box-shadow: 0 0 0 3px rgba(0, 86, 211, 0.1);
}

.search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
    margin-bottom: 3rem;
    border-radius: 20px;
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: 12px 24px;
    border: 2px solid #e0e0e0;
    background: #ffffff;
    color: #666;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 0.95rem;
}

.filter-btn:hover,
.filter-btn.active {
    background: #0056d3;
    color: #ffffff;
    border-color: #0056d3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 86, 211, 0.3);
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.course-card {
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: all 0.4s ease;
    border: 1px solid #f0f0f0;
    animation: fadeInUp 0.6s ease;
    animation-fill-mode: both;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.course-header {
    padding: 2rem;
    background: linear-gradient(135deg, #0056d3 0%, #004bb5 100%);
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

.course-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all 0.6s ease;
}

.course-card:hover .course-header::before {
    transform: scale(1.5);
}

.course-category {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.course-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    line-height: 1.5;
}

.course-content {
    padding: 2rem;
}

.course-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #666;
    font-size: 0.9rem;
}

.stat i {
    color: #0056d3;
    width: 16px;
}

.course-features {
    margin-bottom: 2rem;
}

.course-features h4 {
    color: #1a1a1a;
    margin-bottom: 1rem;
    font-weight: 600;
}

.features-list {
    list-style: none;
}

.features-list li {
    padding: 0.5rem 0;
    color: #666;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.features-list li::before {
    content: '✓';
    color: #0056d3;
    font-weight: bold;
    width: 16px;
}

.course-price {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: #f8f9ff;
    border-radius: 12px;
}

.price-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.current-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0056d3;
}

.original-price {
    font-size: 1rem;
    color: #999;
    text-decoration: line-through;
}

.discount {
    background: #ff4757;
    color: #ffffff;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
}

.whatsapp-cta {
    background: linear-gradient(135deg, #25d366 0%, #20b358 100%);
    color: #ffffff;
    border: none;
    padding: 16px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    text-decoration: none;
}

.whatsapp-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 211, 102, 0.4);
    background: linear-gradient(135deg, #20b358 0%, #1ea049 100%);
}

.whatsapp-cta i {
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: #ffffff;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .search-container {
        max-width: 100%;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .course-stats {
        gap: 1rem;
    }
    
    .filters {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-section {
        padding: 2rem 0;
    }
    
    .course-header,
    .course-content {
        padding: 1.5rem;
    }
    
    .course-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
}