/* Reset and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color palette */
    --primary-color: #1e3a8a;
    --primary-light: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #374151;
    --accent-color: #f59e0b;
    --bg-light: #f8fafc;
    --bg-dark: #0f172a;
    --text-dark: #1f2937;
    --text-light: #f1f5f9;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --error-color: #ef4444;
    --success-color: #10b981;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --heading-line-height: 1.2;
    --body-line-height: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    
    /* Transition */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    
    /* Container max width */
    --container-max-width: 1200px;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: var(--body-line-height);
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

img, svg {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

ul {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--heading-line-height);
    margin-bottom: var(--spacing-md);
    color: var(--secondary-color);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-md);
}

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

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 600;
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: var(--text-light);
}

.btn-secondary {
    background-color: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

.btn-secondary:hover {
    background-color: var(--secondary-color);
    color: var(--text-light);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

input,
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

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

textarea {
    resize: vertical;
}

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

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo a {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo img {
    height: 40px;
    margin-right: var(--spacing-sm);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-weight: 600;
    color: var(--text-dark);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--secondary-color);
    border-radius: 3px;
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: var(--spacing-xxl) 0;
    background-color: var(--bg-light);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-xxl);
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.hero-text p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

/* Section styling */
section {
    padding: var(--spacing-xxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-header h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

/* Courses Section */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.course-card {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.course-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-md);
}

.course-features {
    margin: var(--spacing-lg) 0;
}

.course-features li {
    margin-bottom: var(--spacing-sm);
    position: relative;
    padding-left: 1.5rem;
}

.course-features li::before {
    content: '✓';
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* About Section */
.about {
    background-color: #f0f4f8;
}

.about-inner {
    display: flex;
    align-items: center;
    gap: var(--spacing-xxl);
}

.about-image {
    flex: 1;
}

.about-content {
    flex: 1;
}

.about-content h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.about-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat-item h3 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

/* Why Choose Us Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary-color);
}

/* Testimonials Section */
.testimonials {
    background-color: #f0f4f8;
}

.testimonial-slider {
    position: relative;
    overflow: hidden;
}

.testimonial-slide {
    padding: 0 var(--spacing-lg);
}

.testimonial-content {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.testimonial-icon {
    width: 40px;
    margin: 0 auto var(--spacing-md);
}

.testimonial-author {
    margin-top: var(--spacing-lg);
}

.testimonial-author h4 {
    margin-bottom: var(--spacing-xs);
}

.testimonial-author p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.testimonial-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: var(--spacing-lg);
}

.testimonial-dots {
    display: flex;
    gap: 8px;
    margin: 0 var(--spacing-md);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--border-color);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

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

.testimonial-controls button {
    background: none;
    border: none;
    color: var(--secondary-color);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: background-color var(--transition-fast);
}

.testimonial-controls button:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

/* Blog Preview Section */
.featured-blog-image {
    margin: 20px auto 40px;
    max-width: 800px;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.blog-card {
    background-color: white;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-normal);
}

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

.blog-image {
    background-color: var(--bg-light);
}

.blog-content {
    padding: var(--spacing-lg);
}

.blog-date {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.blog-content h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.read-more {
    display: inline-block;
    margin-top: var(--spacing-sm);
    font-weight: 600;
}

.blog-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* Newsletter Section */
.newsletter {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.newsletter-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xxl);
}

.newsletter-content {
    flex: 1;
}

.newsletter-content h2 {
    color: var(--text-light);
}

.newsletter-form {
    flex: 1;
    display: flex;
    gap: var(--spacing-md);
}

.newsletter-form .form-group {
    flex: 1;
    margin-bottom: 0;
}

.newsletter-form input {
    border: none;
}

.newsletter-form .btn {
    white-space: nowrap;
}

/* Contact Section */
.contact-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.contact-icon {
    color: var(--primary-color);
    flex-shrink: 0;
}

.contact-text h3 {
    margin-bottom: var(--spacing-xs);
}

/* Footer */
footer {
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xxl);
}

.footer-column h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    font-size: 1.2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.footer-logo img {
    height: 40px;
    margin-right: var(--spacing-sm);
    filter: brightness(0) invert(1);
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--text-light);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    color: var(--text-light);
    opacity: 0.8;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.social-links a:hover {
    opacity: 1;
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive styles */
@media (max-width: 992px) {
    h1 {
        font-size: 2.2rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .hero-content,
    .about-inner {
        flex-direction: column;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .newsletter-inner {
        flex-direction: column;
        text-align: center;
    }
    
    .contact-inner {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-text p {
        font-size: 1rem;
    }
    
    .about-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .newsletter-form {
        flex-direction: column;
    }
}

/* Mobile menu active state */
.nav-active {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 100;
}

/* Hidden elements */
.hidden {
    display: none;
}