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

:root {
    --primary-color: hsl(297, 70%, 50%);
    --primary-light: hsl(297, 70%, 60%);
    --primary-dark: hsl(297, 70%, 40%);
    --secondary-color: hsl(220, 70%, 50%);
    --accent-color: hsl(45, 100%, 60%);
    --text-color: hsl(220, 15%, 20%);
    --text-muted: hsl(220, 10%, 50%);
    --border-color: hsl(220, 15%, 90%);
    --bg-light: hsl(220, 20%, 98%);
    --white: #ffffff;
    --success: hsl(120, 50%, 50%);
    --error: hsl(0, 70%, 60%);
    --warning: hsl(45, 100%, 60%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--white);
}

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

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

.nav {
    padding: 1rem 0;
}

.nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: 0.3s;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background: hsl(220, 70%, 40%);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--white);
}

.btn-success {
    background: var(--success);
    color: var(--white);
}

.btn-success:hover {
    background: hsl(120, 50%, 40%);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--white) 100%);
    padding: 4rem 0;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.hero-image img {
    width: 100%;
    height: auto;
}

/* Trust Indicators */
.trust-indicators {
    padding: 3rem 0;
    background: var(--bg-light);
}

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

.trust-item {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.trust-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

/* Featured Courses */
.featured-courses {
    padding: 4rem 0;
}

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

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.course-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--border-color);
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

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

.course-content {
    padding: 1.5rem;
}

.course-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.course-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.course-description {
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
}

.section-footer {
    text-align: center;
}

/* Course Details */
.course-detail {
    padding: 2rem 0;
}

.course-header {
    background: var(--bg-light);
    padding: 3rem 0;
    margin-bottom: 3rem;
}

.course-info {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.course-main h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.course-stats {
    display: flex;
    gap: 2rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.stat-item {
    background: var(--white);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    display: block;
}

.stat-value {
    font-weight: 600;
    color: var(--text-color);
}

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

.price-section {
    text-align: center;
    margin-bottom: 2rem;
}

.current-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.course-sections {
    display: grid;
    gap: 3rem;
}

.section {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.section h2 {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.section ul {
    list-style: none;
}

.section li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.section li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

.curriculum-item {
    background: var(--bg-light);
    padding: 1rem;
    margin: 0.5rem 0;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.instructor-bio {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.faq-question {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.faq-answer {
    color: var(--text-muted);
}

/* Courses Page */
.courses-header {
    background: var(--bg-light);
    padding: 3rem 0 2rem;
}

.courses-header h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.courses-filters {
    background: var(--white);
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 3rem;
}

.filters-grid {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 2rem;
    align-items: end;
}

.filter-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.filter-group input,
.filter-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.filter-group input:focus,
.filter-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Checkout */
.checkout {
    padding: 2rem 0;
}

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

.checkout-steps {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
}

.step {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--border-color);
    color: var(--text-muted);
    border-radius: 20px;
    margin: 0 1rem;
}

.step.active {
    background: var(--primary-color);
    color: var(--white);
}

.checkout-content {
    max-width: 600px;
    margin: 0 auto;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.error-message {
    color: var(--error);
    font-size: 0.9rem;
    margin-top: 0.25rem;
    display: none;
}

.order-summary {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.summary-total {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color);
}

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

.payment-icon {
    width: 40px;
    height: 25px;
    background: var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--text-color);
}

.security-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 1rem 0;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin: 1.5rem 0;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.checkbox-group label {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.4;
}

/* Success Page */
.success-page {
    text-align: center;
    padding: 4rem 0;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    color: var(--white);
    font-size: 2rem;
}

/* Content Pages */
.content-page {
    padding: 3rem 0;
}

.content-header {
    background: var(--bg-light);
    padding: 3rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.content-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.content-body {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.content-body h2 {
    color: var(--primary-color);
    margin: 2rem 0 1rem;
    font-size: 1.8rem;
}

.content-body h3 {
    color: var(--text-color);
    margin: 1.5rem 0 0.75rem;
    font-size: 1.4rem;
}

.content-body p {
    margin-bottom: 1rem;
}

.content-body ul,
.content-body ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.content-body li {
    margin-bottom: 0.5rem;
}

/* Contact Form */
.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.contact-details {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
}

.contact-item {
    margin-bottom: 1.5rem;
}

.contact-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: var(--text-color);
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

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

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

.footer-section a {
    color: hsl(220, 15%, 80%);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    border-top: 1px solid hsl(220, 15%, 40%);
    padding-top: 1rem;
    text-align: center;
    color: hsl(220, 15%, 70%);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-actions {
        justify-content: center;
        flex-wrap: wrap;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

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

    .course-sidebar {
        position: static;
    }

    .filters-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

    .trust-grid {
        grid-template-columns: 1fr;
    }

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

    .course-stats {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .courses-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .course-card {
        margin: 0;
    }

    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
}

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

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

[dir="rtl"] .hero .container {
    grid-template-columns: 1fr 1fr;
}

[dir="rtl"] .hero-content {
    text-align: right;
}

[dir="rtl"] .course-info {
    grid-template-columns: 1fr 2fr;
}

[dir="rtl"] .section li {
    padding-left: 0;
    padding-right: 1.5rem;
}

[dir="rtl"] .section li::before {
    left: auto;
    right: 0;
}

/* Focus States for Accessibility */
.btn:focus,
input:focus,
select:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.nav-menu a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
}