/* CSS Variables for Theme */
:root {
    --primary-color: #3730a3;
    --secondary-color: #0891b2;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-glass: rgba(255, 255, 255, 0.1);
    --border-glass: rgba(255, 255, 255, 0.2);
    --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --blur-amount: 10px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-glass: rgba(0, 0, 0, 0.3);
    --border-glass: rgba(255, 255, 255, 0.1);
}

/* Reset and Base Styles */
html {
    scroll-behavior: smooth;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: var(--transition);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-bottom: 1px solid var(--border-glass);
    transition: var(--transition);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

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

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

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

.nav-menu a:hover::after {
    width: 100%;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(var(--blur-amount));
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 3px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: url('admin-using-laptop-maintenance-artificial-intelligence-neural-networks - Copy.jpg') center/cover no-repeat;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    opacity: 0.8;
}

.hero-content {
    text-align: center;
    color: white;
    z-index: 2;
    position: relative;
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    opacity: 0;
    animation: fadeInUp 1s ease-out 0.5s forwards;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1rem;
    opacity: 0;
    animation: fadeInUp 1s ease-out 0.7s forwards;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 1s ease-out 0.9s forwards;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 1s ease-out 1.1s forwards;
}

/* Button Styles */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    background: #d97706;
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

.btn-secondary {
    background: var(--bg-glass);
    color: white;
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(var(--blur-amount));
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Section Styles */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.2rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

/* Why Choose Us Section */
.why-choose-us {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.course-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.course-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.course-card a:hover {
    color: inherit;
}

.course-image {
    width: 240px;
    height: 240px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
}

.course-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.course-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
}

/* Investment and Product Sections */
.investments {
    background: var(--bg-secondary);
}

.investment-card,
.product-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 3rem;
    display: flex;
    align-items: center;
    gap: 3rem;
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
}

.investment-card:hover,
.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.investment-image,
.product-image {
    width: 360px;
    height: 360px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    flex-shrink: 0;
    overflow: hidden;
}

.investment-image img,
.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
}

.investment-content h3,
.product-content h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.investment-content p,
.product-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: var(--text-secondary);
    max-width: 400px;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--border-glass);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-glass);
    color: var(--text-secondary);
}

/* Sticky Contact Bar */
.contact-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-amount));
    border-top: 1px solid var(--border-glass);
    padding: 1rem;
    z-index: 999;
    transform: translateY(100%);
    transition: var(--transition);
}

.contact-bar.show {
    transform: translateY(0);
}

.contact-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.contact-content i {
    color: var(--primary-color);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .investment-card,
    .product-card {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
    
    .contact-bar {
        bottom: 70px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav {
        padding: 1rem;
    }
    
    .hero-content {
        padding: 0 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid,
    .courses-grid {
        grid-template-columns: 1fr;
    }
}