:root {
    /* Color Palette */
    --bg-color: #0b0f19;
    --surface-color: rgba(20, 26, 40, 0.7);
    --surface-border: rgba(255, 255, 255, 0.08);
    --primary: #4F46E5; /* Indigo */
    --primary-hover: #4338ca;
    --secondary: #06b6d4; /* Cyan */
    --accent: #8b5cf6; /* Purple */
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    /* Layout */
    --container-width: 1200px;
    --nav-height: 80px;
    
    /* Typography */
    --font-main: 'Outfit', sans-serif;
    
    /* Effects */
    --shadow-soft: 0 10px 40px -10px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass-card {
    background: var(--surface-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-lg);
}

.text-center { text-align: center; }
.text-red { color: #ef4444; }
.text-green { color: #10b981; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--font-main);
    font-size: 1rem;
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.9rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--surface-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-link {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.btn-link:hover {
    color: var(--secondary);
    gap: 8px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--surface-border);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
}

.logo img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--text-main);
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-toggle {
    color: var(--text-muted);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    padding: 5px 10px;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-sm);
}

.lang-toggle:hover {
    color: var(--secondary);
    border-color: var(--secondary);
}

.menu-toggle {
    display: none;
    font-size: 2rem;
    color: var(--text-main);
    cursor: pointer;
}

/* Sections */
section {
    padding: 100px 0;
}

.section-header {
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('assets/hero-bg.png');
    background-size: cover;
    background-position: center;
    z-index: -2;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(11, 15, 25, 0.95) 0%, rgba(11, 15, 25, 0.7) 100%);
    z-index: -1;
}

.hero-container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 700px;
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--surface-border);
    border-radius: 100px;
    font-size: 0.9rem;
    color: var(--secondary);
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* About Section */
.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image-wrapper {
    position: relative;
    height: 400px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(6, 182, 212, 0.1));
    border-radius: var(--radius-lg);
    border: 1px solid var(--surface-border);
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-stats {
    position: absolute;
    bottom: -20px;
    right: -20px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-soft);
}

.about-stats i {
    font-size: 2.5rem;
    color: var(--secondary);
}

.about-stats .stat-num {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.about-stats .stat-text {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.about-content p {
    color: var(--text-muted);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.about-content p strong {
    color: var(--text-main);
}

/* Courses Section */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.course-card {
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-soft);
}

.course-card.highlighted {
    background: linear-gradient(180deg, rgba(79, 70, 229, 0.1) 0%, rgba(20, 26, 40, 0.7) 100%);
    border-color: rgba(139, 92, 246, 0.3);
}

.course-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 24px;
}

.course-icon.blue { background: rgba(59, 130, 246, 0.1); color: #3b82f6; }
.course-icon.purple { background: rgba(139, 92, 246, 0.1); color: #8b5cf6; }
.course-icon.cyan { background: rgba(6, 182, 212, 0.1); color: #06b6d4; }

.course-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}

.course-desc {
    color: var(--text-muted);
    flex-grow: 1;
    margin-bottom: 30px;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid var(--surface-border);
}

.badge-sm {
    font-size: 0.8rem;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.badge-sm.highlight {
    background: rgba(139, 92, 246, 0.2);
    color: #c4b5fd;
}

/* Success Section */
.success-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.success-case {
    padding: 40px;
}

.case-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 30px;
}

.case-header i {
    font-size: 2.5rem;
    color: var(--primary);
}

.case-body {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.case-item h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.case-item p {
    color: var(--text-muted);
    padding-left: 32px;
}

.testimonials {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.testimonial-card {
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-lg);
    padding: 30px;
    position: relative;
}

.quote-icon {
    position: absolute;
    top: 30px;
    right: 30px;
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.05);
}

.testimonial-text {
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 1.1rem;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-muted);
}

.author-info strong {
    display: block;
    color: var(--text-main);
}

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

/* Footer */
.footer {
    background: rgba(11, 15, 25, 0.95);
    border-top: 1px solid var(--surface-border);
    padding: 80px 0 20px;
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-info p {
    color: var(--text-muted);
    margin-top: 20px;
    max-width: 300px;
}

.footer-links h4, .footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 24px;
}

.footer-links ul, .footer-contact ul {
    list-style: none;
}

.footer-links li, .footer-contact li {
    margin-bottom: 12px;
}

.footer-links a, .footer-contact a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover, .footer-contact a:hover {
    color: var(--secondary);
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .success-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .about-container {
        grid-template-columns: 1fr;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .nav-links {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav-buttons .btn {
        display: none;
    }
}