/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #007AFF;
    --color-primary-hover: #0051D5;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-border: #d2d2d7;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --font-size-base: 17px;
    --font-size-sm: 14px;
    --font-size-lg: 19px;
    --font-size-xl: 28px;
    --font-size-xxl: 48px;
    --font-size-hero: 80px;
    --line-height-base: 1.47059;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f5f5f7;
        --color-text-secondary: #86868b;
        --color-bg: #000000;
        --color-bg-secondary: #1d1d1f;
        --color-border: #424245;
    }
}

html {
    scroll-behavior: smooth;
}

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

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

@media (prefers-color-scheme: dark) {
    .nav {
        background-color: rgba(0, 0, 0, 0.8);
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 44px;
}

.nav-logo .logo-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-secondary);
}

.cta-link {
    background-color: var(--color-primary);
    color: white !important;
    padding: var(--spacing-xs) var(--spacing-md) !important;
}

.cta-link:hover {
    background-color: var(--color-primary-hover) !important;
}

/* Language Selector */
.language-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: var(--border-radius);
    color: var(--color-text);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.lang-btn:hover {
    background-color: var(--color-bg-secondary);
}

.lang-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    min-width: 160px;
    max-height: 240px;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 1001;
    padding: 0;
}

/* Scroll indicators - fade effect at top and bottom */
.lang-menu::before,
.lang-menu::after {
    content: '';
    position: sticky;
    left: 0;
    right: 0;
    height: 24px;
    pointer-events: none;
    z-index: 2;
    display: block;
    transition: opacity 0.2s ease;
}

.lang-menu::before {
    top: 0;
    background: linear-gradient(to bottom, var(--color-bg) 0%, rgba(255, 255, 255, 0) 100%);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    margin-bottom: -24px;
    opacity: 0;
}

.lang-menu::after {
    bottom: 0;
    background: linear-gradient(to top, var(--color-bg) 0%, rgba(255, 255, 255, 0) 100%);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    margin-top: -24px;
    opacity: 0;
}

.lang-menu.has-scroll-top::before {
    opacity: 1;
}

.lang-menu.has-scroll-bottom::after {
    opacity: 1;
}

.lang-menu-inner {
    padding: 0.5rem 0;
    position: relative;
}

@media (prefers-color-scheme: dark) {
    .lang-menu {
        background: var(--color-bg-secondary);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }
    
    .lang-menu::before {
        background: linear-gradient(to bottom, var(--color-bg-secondary) 0%, rgba(29, 29, 31, 0) 100%);
    }
    
    .lang-menu::after {
        background: linear-gradient(to top, var(--color-bg-secondary) 0%, rgba(29, 29, 31, 0) 100%);
    }
}

/* Custom scrollbar - always visible */
.lang-menu {
    scrollbar-width: thin;
    scrollbar-color: var(--color-text-secondary) transparent;
}

.lang-menu::-webkit-scrollbar {
    width: 8px;
    -webkit-appearance: none;
}

.lang-menu::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 4px;
}

.lang-menu::-webkit-scrollbar-thumb {
    background-color: var(--color-text-secondary);
    border-radius: 4px;
    opacity: 0.4;
    border: 2px solid transparent;
    background-clip: padding-box;
}

.lang-menu::-webkit-scrollbar-thumb:hover {
    opacity: 0.7;
}

.lang-menu::-webkit-scrollbar-thumb:active {
    opacity: 0.9;
}

@media (prefers-color-scheme: dark) {
    .lang-menu {
        scrollbar-color: var(--color-text-secondary) transparent;
    }
    
    .lang-menu::-webkit-scrollbar-thumb {
        background-color: var(--color-text-secondary);
        opacity: 0.5;
    }
    
    .lang-menu::-webkit-scrollbar-thumb:hover {
        opacity: 0.8;
    }
}

.lang-option {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.lang-option:hover {
    background-color: var(--color-bg-secondary);
}

.lang-option:active {
    background-color: var(--color-primary);
    color: white;
}

/* RTL Support */
html[dir="rtl"] .lang-menu {
    right: auto;
    left: 0;
}

html[dir="rtl"] .lang-option {
    text-align: right;
}

/* Hero Section */
.hero {
    padding-top: 120px;
    padding-bottom: var(--spacing-xl);
    text-align: center;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.hero-title {
    font-size: var(--font-size-hero);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.015em;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

.title-line {
    display: block;
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--color-primary) 0%, #5856D6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    line-height: 1.42859;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-cta {
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-note {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 400;
    text-decoration: none;
    border-radius: 22px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 122, 255, 0.3);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    border-radius: 30px;
}

/* Section Styles */
section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    line-height: 1.08349;
    letter-spacing: -0.003em;
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* Features Section */
.features {
    background-color: var(--color-bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature-card {
    background-color: var(--color-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--color-text-secondary);
    line-height: 1.47059;
}

/* Screenshot Section */
.screenshot {
    padding: var(--spacing-xl) 0;
}

.screenshot-content {
    text-align: center;
}

.screenshot-placeholder {
    margin-top: var(--spacing-lg);
}

.screenshot-mockup {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.mockup-browser {
    background-color: var(--color-bg);
    border-radius: 8px;
    overflow: hidden;
}

.mockup-browser-bar {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
}

.mockup-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-border);
}

.mockup-content {
    display: flex;
    height: 400px;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
}

.mockup-video-area {
    flex: 1;
    background: linear-gradient(135deg, #f5f5f7 0%, #e5e5e7 100%);
    border-radius: 8px;
}

.mockup-sidebar {
    width: 300px;
    background-color: var(--color-bg-secondary);
    border-radius: 8px;
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.mockup-sidebar-header {
    height: 40px;
    background-color: var(--color-bg);
    border-radius: 6px;
    margin-bottom: var(--spacing-xs);
}

.mockup-sidebar-item {
    height: 60px;
    background-color: var(--color-bg);
    border-radius: 6px;
    opacity: 0.6;
}

.mockup-sidebar-item.active {
    opacity: 1;
    border: 2px solid var(--color-primary);
}

.screenshot-note {
    margin-top: var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* How It Works Section */
.how-it-works {
    background-color: var(--color-bg-secondary);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.step {
    text-align: center;
}

.step-number {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, #5856D6 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: 0 auto var(--spacing-md);
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--color-text-secondary);
    line-height: 1.47059;
}

/* Privacy Section */
.privacy {
    padding: var(--spacing-xl) 0;
}

.privacy-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.privacy-features {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.privacy-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius);
}

.privacy-item svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, #5856D6 100%);
    color: white;
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.cta-section .section-title,
.cta-section .section-subtitle {
    color: white;
}

.cta-title {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.cta-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

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

.cta-section .btn-primary:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* Footer */
.footer {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-hero: 48px;
        --font-size-xxl: 36px;
        --font-size-xl: 21px;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav-links {
        gap: var(--spacing-sm);
    }

    .nav-link {
        font-size: 13px;
        padding: var(--spacing-xs);
    }

    .hero {
        padding-top: 100px;
        min-height: auto;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .mockup-content {
        flex-direction: column;
        height: auto;
    }

    .mockup-sidebar {
        width: 100%;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-hero: 36px;
        --font-size-xxl: 28px;
        --spacing-md: 1rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }

    .hero-subtitle {
        font-size: var(--font-size-lg);
    }

    .btn-large {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-base);
    }
}