/* CSS Variables */
:root {
    --primary-color: #007AFF;
    --primary-dark: #0056CC;
    --secondary-color: #34C759;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --background-primary: #FFFFFF;
    --background-secondary: #F5F5F7;
    --background-tertiary: #FAFAFA;
    --border-color: #E5E5E7;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --border-radius-large: 20px;
    --transition: all 0.3s ease;
}

/* Dark mode variables */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #F5F5F7;
        --text-secondary: #A1A1A6;
        --background-primary: #000000;
        --background-secondary: #1C1C1E;
        --background-tertiary: #2C2C2E;
        --border-color: #38383A;
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    transition: var(--transition);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

@media (prefers-color-scheme: dark) {
    .header {
        background-color: rgba(0, 0, 0, 0.95);
    }
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

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

.language-switcher {
    display: flex;
    gap: 8px;
    background-color: var(--background-secondary);
    border-radius: var(--border-radius);
    padding: 4px;
}

.lang-btn {
    padding: 8px 16px;
    border: none;
    background: none;
    border-radius: calc(var(--border-radius) - 4px);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.lang-btn.active {
    background-color: var(--background-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-light);
}

.lang-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.screenshot-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.screenshot {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-heavy);
    transition: var(--transition);
}



.light-theme {
    position: relative;
    z-index: 2;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.dark-theme {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    z-index: 1;
    transition: opacity 0.3s ease;
}

.screenshot-container:hover .light-theme {
    opacity: 0;
}

.screenshot-container:hover .dark-theme {
    opacity: 1;
}

/* Features Section */
.features {
    padding: 80px 0;
    background-color: var(--background-secondary);
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--background-primary);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-medium);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card ul {
    list-style: none;
    padding: 0;
}

.feature-card li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.feature-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* Perfect For Section */
.perfect-for {
    padding: 80px 0;
    background-color: var(--background-primary);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.activity-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem;
    background-color: var(--background-secondary);
    border-radius: var(--border-radius-large);
    transition: var(--transition);
}

.activity-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

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

.activity-item span {
    font-weight: 500;
    color: var(--text-primary);
}

/* Requirements Section */
.requirements {
    padding: 80px 0;
    background-color: var(--background-secondary);
}

.requirements-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.requirement-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--background-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.requirement-icon {
    font-size: 2rem;
}

.requirement-item span {
    font-weight: 500;
    color: var(--text-primary);
}

.note {
    text-align: center;
    padding: 2rem;
    background-color: var(--background-tertiary);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.note p {
    margin: 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* CTA Section */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-align: center;
}

.cta-content h2 {
    margin-bottom: 1rem;
    color: white;
}

.cta-content p {
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
}

.cta .btn-primary {
    background-color: white;
    color: var(--primary-color);
}

.cta .btn-primary:hover {
    background-color: var(--background-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Footer */
.footer {
    padding: 2rem 0;
    background-color: var(--background-tertiary);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

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

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-links .separator {
    color: var(--text-secondary);
    opacity: 0.5;
}

.footer-content p {
    color: var(--text-secondary);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .activities-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .requirements-list {
        grid-template-columns: 1fr;
    }
    
    .language-switcher {
        gap: 4px;
    }
    
    .lang-btn {
        padding: 6px 12px;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.875rem;
    }
    
    .btn-large {
        padding: 12px 24px;
        font-size: 1rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .activity-item {
        padding: 1.5rem;
    }
}

/* Animation classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
}

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

/* Skip link styles */
.skip-link {
    position: absolute !important;
    top: -40px !important;
    left: 6px !important;
    background: var(--primary-color) !important;
    color: white !important;
    padding: 8px !important;
    text-decoration: none !important;
    border-radius: 4px !important;
    z-index: 1001 !important;
    opacity: 0 !important;
    transition: opacity 0.2s ease !important;
}

.skip-link:focus {
    top: 6px !important;
    opacity: 1 !important;
}

/* Loading animation for images */
.screenshot {
    /* Убираем animation, чтобы не конфликтовать с hover эффектами */
}