/* CSS змінні */
:root {
    --gradient-primary: linear-gradient(135deg, #4A90E2 0%, #FF7F00 100%);
    --gradient-secondary: linear-gradient(135deg, #FF7F00 0%, #4A90E2 100%);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 15px;
    --radius-xl: 20px;
    --font-size-sm: 0.9rem;
    --font-size-base: 1rem;
    --font-size-lg: 18px;
    --font-size-xl: 1.2rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2.2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --color-primary: #4A90E2;
    --color-secondary: #FF7F00;
    --color-secondary-hover: #e66d00;
    --color-dark: #2c3e50;
    --color-green: #2d5016;
    --color-text: #333;
    --color-text-light: #666;
    --color-bg-light: #f8f9fa;
    --color-border: #e0e0e0;
    --color-white: #ffffff;
    --shadow-sm: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-md: 0 5px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 15px 35px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    --transition-base: all 0.3s ease;
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 25px;
    --spacing-2xl: 30px;
    --spacing-3xl: 40px;
    --spacing-4xl: 60px;
    --spacing-5xl: 80px;
    --spacing-6xl: 100px;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header */
header {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: var(--transition-base);
}

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

/* Logo styles */
.logo {
    display: flex;
    align-items: center;
    font-weight: bold;
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--font-size-lg);
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
}

/* Navigation */
nav {
    display: flex;
    gap: var(--spacing-2xl);
}

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

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

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

/* Main content */
main {
    margin-top: 80px;
}

/* Hero section */
.hero {
    background: var(--gradient-primary);
    color: var(--color-white);
    padding: var(--spacing-5xl) 0;
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="90" cy="20" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="20" cy="90" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: bold;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.subtitle {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-3xl);
    opacity: 0.9;
    font-weight: 300;
}

.hero-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.feature h3 {
    font-size: 1.1rem;
    font-weight: 600;
    background: rgba(255,255,255,0.1);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    transition: var(--transition-base);
}

.feature h3:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transition: var(--transition-base);
}

.hero-image:hover img {
    transform: scale(1.02);
}

/* Buttons */
.cta-button {
    background: var(--color-secondary);
    color: var(--color-white);
    border: none;
    padding: 18px 35px;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    background: var(--color-secondary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255,127,0,0.3);
}

.cta-button.large {
    padding: 22px 45px;
    font-size: var(--font-size-xl);
}

/* Program section */
.program {
    padding: var(--spacing-6xl) 0;
    background: var(--color-bg-light);
}

.program h2 {
    text-align: center;
    font-size: var(--font-size-4xl);
    color: var(--color-text);
    margin-bottom: var(--spacing-4xl);
    position: relative;
}

.program h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.program-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
    max-width: 1100px;
    margin: 0 auto;
}

.program-item {
    background: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    border: 1px solid transparent;
}

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

.program-number {
    position: absolute;
    top: -15px;
    left: var(--spacing-2xl);
    background: var(--color-primary);
    color: var(--color-white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: var(--shadow-md);
}

.program-item h3 {
    color: var(--color-text);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-sm);
    line-height: 1.3;
}

.program-item p {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* Curriculum Structure Section */
.curriculum-structure {
    padding: var(--spacing-6xl) 0;
    background: var(--color-white);
    position: relative;
}

.curriculum-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.curriculum-header h2 {
    font-size: var(--font-size-4xl);
    color: var(--color-text);
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.curriculum-header .highlight {
    background: var(--color-secondary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: bold;
    box-shadow: var(--shadow-md);
}

.curriculum-list {
    max-width: 900px;
    margin: 0 auto;
}

.curriculum-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
    border-radius: var(--radius-md);
}

.curriculum-item:hover {
    background: rgba(74, 144, 226, 0.02);
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
    border-bottom: 1px solid transparent;
    margin-bottom: 2px;
    box-shadow: var(--shadow-sm);
}

.curriculum-number {
    background: var(--color-green);
    color: var(--color-white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: var(--font-size-xl);
    margin-right: var(--spacing-xl);
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
    position: relative;
}

.curriculum-number::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--color-green), #4a7022);
    z-index: -1;
}

.curriculum-content {
    flex: 1;
    margin-right: var(--spacing-lg);
}

.curriculum-content h3 {
    color: var(--color-text);
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    margin: 0;
    transition: var(--transition-base);
}

.curriculum-item:hover .curriculum-content h3 {
    color: var(--color-primary);
}

.curriculum-toggle {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-xl);
    transition: var(--transition-base);
    flex-shrink: 0;
    border: 1px solid transparent;
}

.curriculum-toggle:hover {
    background: rgba(74, 144, 226, 0.1);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.curriculum-toggle i {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.curriculum-toggle:hover i {
    transform: rotate(90deg);
}

/* Certificate section styles */
.certificate-section {
    background: var(--gradient-secondary);
    position: relative;
}

.certificate-section .hero-content {
    grid-template-columns: 1fr 1fr;
}

.certificate-section .hero-image {
    order: 1;
}

.certificate-section .hero-text {
    order: 2;
}

/* Pricing section styles */
.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    max-width: 600px;
    margin: 0 auto;
}

.pricing-item {
    background: var(--color-white);
    padding: var(--spacing-3xl) var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    border: 1px solid transparent;
    text-align: center;
}

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

.price-amount {
    font-size: var(--font-size-5xl);
    font-weight: bold;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.price-title {
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
    font-size: 1.4rem;
}

.price-features {
    text-align: left;
    max-width: 450px;
    margin: 0 auto;
}

.price-feature {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.price-feature:last-child {
    margin-bottom: 0;
}

.price-bullet {
    color: var(--color-secondary);
    font-weight: bold;
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
}

.price-feature span:last-child {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* CTA section */
.cta-section {
    background: var(--gradient-secondary);
    color: var(--color-white);
    padding: var(--spacing-5xl) 0;
    text-align: center;
    position: relative;
}

.cta-content h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.cta-content p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-3xl);
    opacity: 0.9;
}

/* Footer */
footer {
    background: var(--color-dark);
    color: var(--color-white);
    padding: 50px 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.footer-content a {
    color: var(--color-white);
}

.footer-info .logo {
    margin-bottom: var(--spacing-lg);
    color: var(--color-white);
    align-items: flex-start;
}

.footer-info .logo .logo-icon {
    margin-right: var(--spacing-md);
    margin-top: 2px;
}

.footer-info .logo span {
    font-size: 1.1rem;
    line-height: 1.4;
    flex: 1;
}

.footer-info p {
    opacity: 0.8;
    font-size: var(--font-size-base);
    line-height: 1.6;
}

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

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

.contact-label {
    font-weight: bold;
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item a {
    color: var(--color-white);
    text-decoration: none;
    transition: var(--transition-base);
    position: relative;
}

.contact-item a:hover {
    color: var(--color-secondary);
    padding-left: 5px;
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.2rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.8rem;
        --font-size-2xl: 1.2rem;
        --spacing-6xl: 60px;
        --spacing-5xl: 60px;
        --spacing-4xl: 40px;
        --spacing-3xl: 30px;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    nav {
        display: none;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
        text-align: center;
    }

    .hero-features {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .program-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .program-item {
        padding: var(--spacing-xl);
    }

    .curriculum-header .highlight {
        display: block;
        margin-bottom: var(--spacing-sm);
    }

    .curriculum-item {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
        padding: var(--spacing-lg) 0;
    }

    .curriculum-item:hover {
        padding-left: 0;
        padding-right: 0;
    }

    .curriculum-number {
        margin-bottom: var(--spacing-md);
        margin-right: 0;
        width: 40px;
        height: 40px;
        font-size: var(--font-size-base);
    }

    .curriculum-content {
        margin-right: 0;
        margin-bottom: var(--spacing-md);
        width: 100%;
    }

    .curriculum-content h3 {
        font-size: var(--font-size-base);
    }

    .curriculum-toggle {
        align-self: flex-end;
    }

    .certificate-section .hero-image {
        order: 2;
    }

    .certificate-section .hero-text {
        order: 1;
    }

    /* Mobile responsiveness for pricing */
    .pricing-item {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
    
    .price-amount {
        font-size: var(--font-size-4xl);
    }
    
    .price-title {
        font-size: 1.2rem;
    }
    
    .price-features {
        max-width: 100%;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }

    .footer-info .logo {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-info .logo .logo-icon {
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
        margin-top: 0;
    }

    .footer-info .logo span {
        font-size: var(--font-size-base);
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus styles for accessibility */
*:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:focus {
    outline-color: var(--color-secondary);
}

/* Print styles */
@media print {
    header {
        position: static;
        box-shadow: none;
    }
    
    main {
        margin-top: 0;
    }
    
    .hero,
    .certificate-section,
    .cta-section {
        background: none !important;
        color: black !important;
    }
    
    .cta-button {
        display: none;
    }
}