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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* Header */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo img {
    height: 40px;
    width: auto;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav a:hover {
    color: #007bff;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
}

.btn-outline {
    background: transparent;
    color: #007bff;
    border: 2px solid #007bff;
}

.btn-outline:hover {
    background: #007bff;
    color: white;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Featured Courses */
.featured-courses {
    padding: 80px 0;
    background: #f8f9fa;
}

.featured-courses h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.course-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.course-card:hover {
    transform: translateY(-5px);
}

.course-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.course-content {
    padding: 1.5rem;
}

.course-tag {
    display: inline-block;
    background: #e9ecef;
    color: #495057;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.course-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #333;
}

.course-description {
    color: #666;
    margin-bottom: 1rem;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.course-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: #007bff;
    margin-bottom: 1rem;
}

/* Trust Section */
.trust-section {
    padding: 80px 0;
    background: white;
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.trust-item {
    text-align: center;
}

.trust-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.trust-item p {
    color: #666;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #007bff;
}

.form-control.error {
    border-color: #dc3545;
}

.error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
    margin-top: 0.25rem;
}

/* Course Detail */
.course-header {
    background: #f8f9fa;
    padding: 60px 0;
}

.course-header-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.course-info h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.course-sidebar {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    position: sticky;
    top: 100px;
}

.course-sidebar img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.course-tabs {
    padding: 60px 0;
}

.tab-buttons {
    display: flex;
    border-bottom: 2px solid #e9ecef;
    margin-bottom: 2rem;
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 2rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: #666;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab-button.active {
    color: #007bff;
    border-bottom-color: #007bff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Checkout */
.checkout-steps {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

.step {
    display: flex;
    align-items: center;
    color: #666;
}

.step.active {
    color: #007bff;
}

.step-number {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #e9ecef;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.5rem;
    font-weight: 600;
}

.step.active .step-number {
    background: #007bff;
    color: white;
}

.payment-icons {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    align-items: center;
}

.payment-icon {
    width: 40px;
    height: 25px;
}

.security-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #28a745;
    font-size: 0.9rem;
    margin: 1rem 0;
}

/* Footer */
.footer {
    background: #343a40;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section a {
    display: block;
    color: #adb5bd;
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid #495057;
    padding-top: 1rem;
    text-align: center;
    color: #adb5bd;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mb-2 {
    margin-bottom: 2rem;
}

.mt-2 {
    margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .course-header-content {
        grid-template-columns: 1fr;
    }
    
    .tab-buttons {
        flex-wrap: wrap;
    }
    
    .tab-button {
        padding: 0.75rem 1rem;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
}

/* RTL Support */
[dir="rtl"] {
    text-align: right;
}

[dir="rtl"] .header-content {
    flex-direction: row-reverse;
}

[dir="rtl"] .nav {
    flex-direction: row-reverse;
}

[dir="rtl"] .course-meta {
    flex-direction: row-reverse;
}

[dir="rtl"] .checkbox-group {
    flex-direction: row-reverse;
}