* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Cairo', sans-serif;
}

/* COLOR VARIABLES */
:root {
  --dark-blue: #2C3E50;
  --light-gray: #F4F4F4;
  --white: #FFFFFF;
  --bright-blue: #3498DB;
  --medium-blue: #2980B9;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
}

.logo {
    font-size: 2rem;
    font-weight: bold;
    background: #2980b9;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

nav ul li a {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    position: relative;
}

nav ul li a:hover {
    color: #2980b9;
    background: rgba(102, 126, 234, 0.1);
}

.nav-cta {
    background: linear-gradient(135deg, #2980b9 0%, #2c3e50 100%);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

/* Hero Section with Slider */
.hero {
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.slider {
    width: 100%;
    height: 100%;
    display: flex;
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide {
    min-width: 100%;
    height: 100%;
    background-size: cover;       
    background-repeat: no-repeat; 
    background-position: center;  
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    position: relative;
}

.slide:nth-child(1) {
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1522202176988-66273c2fd55f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1500&q=80');
}

.slide:nth-child(2) {
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?ixlib=rb-4.0.3&auto=format&fit=crop&w=1500&q=80');
}

.slide:nth-child(3) {
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1501504905252-473c47e087f8?ixlib=rb-4.0.3&auto=format&fit=crop&w=1500&q=80');
}

.hero-content {
    max-width: 800px;
    z-index: 2;
    padding: 0 2rem;
    animation: fadeInUp 1s ease-out;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    font-weight: 700;
    line-height: 1.2;
    color: white;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    opacity: 0.95;
    color: white;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-button {
    background: white;
    color: #2980b9;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.3);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.4);
}

.cta-button.secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.cta-button.secondary:hover {
    background: white;
    color: #2980b9;
}

.slider-controls {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 3;
}

.slider-controls button {
    width: 14px;
    height: 14px;
    border: none;
    border-radius: 50%;
    background: #2c3e50;
    cursor: pointer;
    transition: all 0.3s ease;
}

.slider-controls button.active,
.slider-controls button:hover {
    background: #2980b9;
    transform: scale(1.2);
}

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

/* Section Styles */
section {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 1rem;
    position: relative;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #2980b9, #2c3e50);
    border-radius: 2px;
}

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

/* Features Section */
.features {
    background: #f8faff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background: white;
    padding: 1.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
    transition: left 0.5s;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card i {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--medium-blue), var(--dark-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    display: block;
}

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

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* Categories */
.categories {
    background: white;
}

.categories-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.category {
    background: white;
    padding: 0.8rem 1.8rem;
    border-radius: 25px;
    border: 2px solid #2980b9;
    color: #2980b9;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.category:hover,
.category.active {
    background: linear-gradient(135deg, #2980b9, #2c3e50);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

/* Courses Section */
.courses {
    background: #f8faff;
}

.course-grid {
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.course-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

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

.course-card-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1; 
}

.course-card h3 {
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 1rem;
}

.course-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
    flex-grow: 1; 
}

.course-card .cta-button {
    width: 100%;
    text-align: center;
    background: #2980b9;
    color: white;
    box-shadow: none;
    margin-top: auto; 
}

.course-card .cta-button:hover {
    background: #2c3e50;
}

/* About Us Section */
.about-us {
    background: #f4f4f4;
    text-align: center;
}

/* Testimonials */
.testimonials {
    background: #f8faff;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.testimonial-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.testimonial-card::before {
    content: '"';
    font-size: 4rem;
    color: #2980b9;
    position: absolute;
    top: -10px;
    left: 20px;
    line-height: 1;
    opacity: 0.3;
}

.testimonial-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.testimonial-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: 1.5rem;
    border: 3px solid #2980b9;
    object-fit: cover;
}

.rating {
    color: #ffc107;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.testimonial-card p {
    font-style: italic;
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.testimonial-card h4 {
    color: #333;
    font-size: 1.1rem;
}

/* Instructor CTA */
.instructor-cta {
    background: linear-gradient(135deg, #2980b9 0%, #2c3e50 100%);
    color: white;
    text-align: center;
}

.instructor-cta h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: white;
}

.instructor-cta p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    color: white;
}

.instructor-cta .cta-button {
    background: white;
    color: #2980b9;
    font-size: 1.1rem;
    padding: 1rem 2.5rem;
}

/* Newsletter */
.newsletter {
    background: white;
    text-align: center;
}

.newsletter form {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.newsletter input {
    flex: 1;
    min-width: 200px; 
    padding: 1rem;
    border: 2px solid #e1e5f2;
    border-radius: 50px;
    outline: none;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.newsletter input:focus {
    border-color: #2980b9;
}

.newsletter button {
    background: linear-gradient(135deg, #2980b9, #2c3e50);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.3s ease;
    font-size: 1rem;
}

.newsletter button:hover {
    transform: translateY(-2px);
}

/* Back to Top Button */
.back-to-top {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, #2980b9, #2c3e50);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    z-index: 1000;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.back-to-top.show {
    display: block;
}

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

/* Scroll animations */
.fade-in-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}