:root {
    /* Modern professional color palette */
    --primary-color: #2563eb;      /* Modern blue */
    --primary-dark: #1e40af;       /* Darker blue */
    --primary-light: #3b82f6;      /* Light blue */
    --accent-color: #10b981;       /* Modern green accent */
    --accent-orange: #f59e0b;      /* Warm accent */
    
    /* Text colors */
    --text-dark: #1f2937;          /* Dark gray */
    --text-medium: #4b5563;        /* Medium gray */
    --text-light: #6b7280;         /* Light gray */
    
    /* Background colors */
    --bg-white: #ffffff;
    --bg-light: #f9fafb;           /* Very light gray */
    --bg-dark: #111827;            /* Dark background */
    --bg-card: #ffffff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-dark: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.8);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand h2 {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.5rem;
    font-weight: 700;
}

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

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

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

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

/* Hero Section */
.hero {
    background: var(--gradient-primary);
    color: white;
    padding: 6rem 0 5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

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

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.35rem;
    margin-bottom: 1rem;
    opacity: 0.95;
    font-weight: 400;
}

.hero-instructor {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    font-weight: 500;
}

.hero-details {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.icon {
    font-size: 1.5rem;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: rgba(255, 255, 255, 0.95);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.hero .btn-secondary {
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.hero .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

/* Button on white background */
.section .btn-primary {
    background: var(--primary-color);
    color: white;
}

.section .btn-primary:hover {
    background: var(--primary-dark);
}

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

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

/* Sections */
.section {
    padding: 5rem 0;
}

.bg-alt {
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

/* About Grid */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.about-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid #e5e7eb;
    text-align: center;
    transition: all 0.3s ease;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.about-card h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
    font-weight: 700;
}

.about-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Parts Grid */
.parts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.part-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.part-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.part-header {
    border-bottom: 2px solid #e5e7eb;
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.part-header h3 {
    color: var(--text-dark);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.part-time {
    color: var(--text-light);
    font-size: 0.9rem;
}

.part-topics {
    list-style: none;
}

.part-topics li {
    padding: 0.75rem 0;
    border-bottom: 1px solid #eee;
}

.part-topics li:before {
    content: "✓ ";
    color: var(--primary-color);
    font-weight: bold;
    margin-right: 0.5rem;
}

/* Curriculum Grid */
.curriculum-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.curriculum-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 50px;
}

.curriculum-item h4 {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.curriculum-item p {
    color: var(--text-light);
}

/* Outcomes Grid */
.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.outcome-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.outcome-item:hover {
    border-color: var(--accent-color);
    box-shadow: var(--shadow);
}

.check-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
}

/* Pricing Grid */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-xl);
    border: 2px solid #e5e7eb;
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.pricing-card.featured {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
}

.pricing-header {
    text-align: center;
    border-bottom: 2px solid var(--bg-light);
    padding-bottom: 1.5rem;
    margin-bottom: 1.5rem;
}

.pricing-header h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.price {
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: 0.25rem;
}

.currency {
    font-size: 1.5rem;
    color: var(--text-light);
}

.amount {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-list {
    list-style: none;
    margin-bottom: 2rem;
}

.features-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--bg-light);
}

.pricing-card .btn {
    width: 100%;
    text-align: center;
}

/* Instructor Section */
.instructor-card {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-card);
    padding: 3rem;
    border-radius: var(--radius-xl);
    border: 1px solid #e5e7eb;
}

.instructor-info h3 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.instructor-title {
    color: var(--text-light);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.instructor-bio {
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 2rem;
}

/* Contact Section */
.contact-content {
    text-align: center;
}

.contact-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-link {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.contact-link:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: #9ca3af;
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid #1f2937;
}

.footer p {
    margin: 0.5rem 0;
}

.footer a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color 0.3s;
}

.footer a:hover {
    color: white;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-40 {
    margin-top: 2.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .parts-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-cta .btn {
        width: 100%;
    }
}