/* ChatGPT Export Helper - Landing Page Styles */

/* Page Loader */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.loaded {
    opacity: 0;
    visibility: hidden;
}

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

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader-text {
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 600;
    letter-spacing: 0.05em;
    animation: pulse 1.5s ease-in-out infinite;
}

/* Scroll Reveal Animation */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animation delay */
.formats-grid .format-item:nth-child(1) { transition-delay: 0.1s; }
.formats-grid .format-item:nth-child(2) { transition-delay: 0.2s; }
.formats-grid .format-item:nth-child(3) { transition-delay: 0.3s; }
.formats-grid .format-item:nth-child(4) { transition-delay: 0.4s; }
.formats-grid .format-item:nth-child(5) { transition-delay: 0.5s; }
.formats-grid .format-item:nth-child(6) { transition-delay: 0.6s; }

.feature-cards .feature-card:nth-child(1) { transition-delay: 0.1s; }
.feature-cards .feature-card:nth-child(2) { transition-delay: 0.2s; }
.feature-cards .feature-card:nth-child(3) { transition-delay: 0.3s; }
.feature-cards .feature-card:nth-child(4) { transition-delay: 0.4s; }
.feature-cards .feature-card:nth-child(5) { transition-delay: 0.5s; }
.feature-cards .feature-card:nth-child(6) { transition-delay: 0.6s; }

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

:root {
    /* Colors */
    --primary-color: #10a37f;
    --primary-hover: #0d8f6f;
    --secondary-color: #343541;
    --accent-color: #ff6b35;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --text-light: #999;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-accent: #f0f4f8;
    --border-color: #e1e8ed;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-heavy: 0 16px 48px rgba(0, 0, 0, 0.16);
    --shadow-colored: 0 20px 60px rgba(16, 163, 127, 0.2);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #10a37f 0%, #0d8f6f 100%);
    --gradient-chrome: linear-gradient(135deg, #4285f4 0%, #34a853 50%, #fbbc04 100%);
    --gradient-edge: linear-gradient(135deg, #0078d4 0%, #00bcf2 100%);
    --gradient-sunset: linear-gradient(135deg, #ff6b35 0%, #ff4e50 100%);
    --gradient-aurora: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    --gradient-mesh: radial-gradient(at 40% 20%, hsla(28,100%,74%,1) 0px, transparent 50%),
                      radial-gradient(at 80% 0%, hsla(189,100%,56%,1) 0px, transparent 50%),
                      radial-gradient(at 0% 50%, hsla(355,100%,93%,1) 0px, transparent 50%),
                      radial-gradient(at 80% 50%, hsla(340,100%,76%,1) 0px, transparent 50%),
                      radial-gradient(at 0% 100%, hsla(22,100%,77%,1) 0px, transparent 50%),
                      radial-gradient(at 80% 100%, hsla(242,100%,70%,1) 0px, transparent 50%),
                      radial-gradient(at 0% 0%, hsla(343,100%,76%,1) 0px, transparent 50%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-spring: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: #b3b3b3;
        --text-light: #888;
        --bg-primary: #1a1a1a;
        --bg-secondary: #2d2d2d;
        --bg-accent: #343541;
        --border-color: #404040;
    }
}

/* Base Typography */
body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-mesh);
    opacity: 0.03;
    z-index: -1;
    animation: meshMove 20s ease-in-out infinite;
}

@keyframes meshMove {
    0%, 100% { transform: scale(1) rotate(0deg); }
    33% { transform: scale(1.1) rotate(120deg); }
    66% { transform: scale(0.95) rotate(240deg); }
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* Language Selector */
.language-selector {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    animation: slideInRight 0.6s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.language-selector select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid transparent;
    border-radius: var(--border-radius-lg);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: var(--transition-smooth);
    cursor: pointer;
    box-shadow: var(--shadow-light);
    background-image: linear-gradient(white, white), var(--gradient-primary);
    background-origin: border-box;
    background-clip: padding-box, border-box;
}

.language-selector select:hover,
.language-selector select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-4xl) 0;
    position: relative;
    overflow: hidden;
    text-align: center;
}

/* Animated gradient overlay */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: heroGlow 15s ease-in-out infinite;
    pointer-events: none;
}

@keyframes heroGlow {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.5; }
    33% { transform: translate(10%, -10%) scale(1.1); opacity: 0.7; }
    66% { transform: translate(-10%, 10%) scale(0.9); opacity: 0.3; }
}

/* Floating particles effect */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 90% 90%, rgba(255, 255, 255, 0.04) 0%, transparent 50%);
    animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* Title Box */
.title-box {
    position: relative;
    z-index: 2;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl) var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.98);
    border-radius: var(--border-radius-xl);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 10px 40px rgba(0, 0, 0, 0.08),
        inset 0 0 0 1px rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.3);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--spacing-2xl);
    animation: titleBoxEntrance 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    transform: translateY(20px);
    opacity: 0;
}

@keyframes titleBoxEntrance {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    margin: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f77062 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: titleGradient 4s ease-in-out infinite, fadeInUp 0.6s ease-out 0.1s both;
    letter-spacing: -0.02em;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

@keyframes titleGradient {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Introduction Box */
.intro-box {
    position: relative;
    z-index: 2;
    margin-bottom: var(--spacing-3xl);
    padding: var(--spacing-xl) var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius-xl);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 10px 40px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.25);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--spacing-3xl);
    animation: introBoxEntrance 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) 0.1s forwards;
    transform: translateY(20px);
    opacity: 0;
}

@keyframes introBoxEntrance {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* Download Buttons */
.download-buttons {
    position: relative;
    z-index: 2;
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-medium);
}

.download-btn::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;
}

.download-btn:hover::before {
    left: 100%;
}

.chrome-btn {
    background: linear-gradient(135deg, #4285f4 0%, #34a853 50%, #fbbc04 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.chrome-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.chrome-btn:hover::after {
    width: 300px;
    height: 300px;
}

.chrome-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 12px 40px rgba(66, 133, 244, 0.3);
}

.edge-btn {
    background: linear-gradient(135deg, #0078d4 0%, #00bcf2 50%, #40e0d0 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.edge-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.edge-btn:hover::after {
    width: 300px;
    height: 300px;
}

.edge-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 12px 40px rgba(0, 120, 212, 0.3);
}

.hero-visual {
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

/* Feature Showcase */
.feature-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

.showcase-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

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

.format-icon {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-xs);
}

.format-name {
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.format-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.4;
}

/* Export Formats Section */
.formats-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.formats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    max-width: 1800px;
    margin-left: auto;
    margin-right: auto;
}

.format-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.95) 100%);
    border-radius: var(--border-radius-xl);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 5px 15px rgba(0, 0, 0, 0.08);
    transition: var(--transition-smooth);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

/* Gradient border effect */
.format-item::before {
    content: '';
    position: absolute;
    inset: 0;
    padding: 2px;
    border-radius: var(--border-radius-xl);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f77062 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* Hover glow effect */
.format-item::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.format-item:hover::before {
    opacity: 1;
}

.format-item:hover::after {
    opacity: 1;
}

.format-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 20px 60px rgba(0, 0, 0, 0.15),
        0 0 40px rgba(102, 126, 234, 0.1);
}

.format-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 50%;
    transition: var(--transition);
}

.format-item:hover .format-icon {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
}

.formats-section .format-name {
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.01em;
    transition: var(--transition);
}

.format-item:hover .format-name {
    background: linear-gradient(135deg, #764ba2 0%, #f77062 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transform: scale(1.05);
}

.formats-section .format-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.6;
    font-weight: 500;
    opacity: 0.8;
    transition: var(--transition);
}

.format-item:hover .format-desc {
    opacity: 1;
}

/* Feature Cards */
.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.feature-card {
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98) 0%, rgba(248, 249, 250, 0.98) 100%);
    border-radius: var(--border-radius-xl);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 5px 15px rgba(0, 0, 0, 0.08);
    transition: var(--transition-smooth);
    text-align: center;
    border: 1px solid rgba(230, 230, 230, 0.5);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.feature-icon {
    font-size: var(--font-size-3xl);
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 20px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
}

/* Animated gradient background */
.feature-card::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(45deg, #667eea, #764ba2, #f77062, #667eea);
    background-size: 400% 400%;
    border-radius: var(--border-radius-xl);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.feature-card:hover::before {
    opacity: 0.05;
}

/* Hover lift effect */
.feature-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: 
        0 1px 3px rgba(0, 0, 0, 0.05),
        0 20px 40px rgba(0, 0, 0, 0.12),
        0 0 30px rgba(102, 126, 234, 0.08);
}

.feature-card h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.01em;
    transition: var(--transition);
}

.feature-card p {
    margin: 0;
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.6;
    opacity: 0.85;
    transition: var(--transition);
}

.feature-card:hover p {
    opacity: 1;
}

/* Shimmer effect on hover */
.feature-card:hover h3 {
    background: linear-gradient(135deg, #764ba2 0%, #f77062 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: textShimmer 2s ease-in-out infinite;
}

@keyframes textShimmer {
    0%, 100% { filter: brightness(1); }
    50% { filter: brightness(1.2); }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::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;
}

.btn:hover::before {
    left: 100%;
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.btn-icon {
    font-size: var(--font-size-lg);
}

/* Sections */
section {
    padding: var(--spacing-4xl) 0;
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f77062 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: titleGradient 4s ease-in-out infinite;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
    animation: slideInUp 0.6s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Features Section */
.features {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, rgba(248, 249, 250, 0.5) 100%);
    padding: var(--spacing-4xl) 0;
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

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

.feature-card.featured {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(16, 163, 127, 0.05) 100%);
}

.feature-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.feature-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
    display: block;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

/* Export Modes Section */
.modes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.mode-card {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    border: 1px solid var(--border-color);
}

.mode-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.mode-card.highlighted {
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(16, 163, 127, 0.08) 100%);
    border: 2px solid var(--primary-color);
}

.mode-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.mode-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

.mode-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.mode-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.mode-features {
    list-style: none;
    padding: 0;
}

.mode-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.mode-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Technical Section */
.technical {
    background: var(--bg-secondary);
}

.technical-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.tech-card {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

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

.tech-icon {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
}

.tech-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.tech-card li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
    line-height: 1.6;
}

.tech-card li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: var(--font-size-xs);
}

/* Stats Section */
.stats {
    background: var(--primary-color);
    color: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-2xl);
    text-align: center;
}

.stat-item {
    padding: var(--spacing-lg);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Download Section */
.download {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-accent) 100%);
}

.download-subtitle {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-3xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-4xl);
}

.download-card {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.download-card.primary {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(16, 163, 127, 0.05) 100%);
    transform: scale(1.05);
}

.download-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-medium);
}

.download-card.primary:hover {
    transform: translateY(-4px) scale(1.07);
}

.download-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

.download-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

/* Installation Steps */
.installation-steps {
    background: var(--bg-primary);
    padding: var(--spacing-3xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
}

.installation-steps h3 {
    text-align: center;
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

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

.step {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.step:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.step-number {
    background: var(--primary-color);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-sm);
}

/* Footer */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: var(--spacing-4xl) 0 var(--spacing-xl) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.footer-section h3 {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
}

.footer-section h4 {
    font-size: var(--font-size-lg);
}

.footer-section p {
    color: #b3b3b3;
    line-height: 1.7;
}

.footer-links {
    list-style: none;
    padding: 0;
}

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

.footer-links a {
    color: #b3b3b3;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid #404040;
    padding-top: var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-copyright {
    color: #888;
    font-size: var(--font-size-sm);
}

.footer-tech {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.tech-badges {
    display: flex;
    gap: var(--spacing-sm);
}

.tech-badge {
    background: rgba(16, 163, 127, 0.2);
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

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

/* Pulse animation for CTAs */
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.4);
    }
    70% {
        box-shadow: 0 0 0 20px rgba(102, 126, 234, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0);
    }
}

/* Float animation for cards */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .feature-grid,
    .modes-grid,
    .technical-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-4xl: 3rem;
        --spacing-3xl: 2rem;
        --spacing-2xl: 1.5rem;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .download-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .title-box,
    .intro-box {
        margin-left: var(--spacing-md);
        margin-right: var(--spacing-md);
        padding: var(--spacing-lg) var(--spacing-lg);
    }
    
    .feature-grid,
    .modes-grid,
    .technical-grid,
    .download-options {
        grid-template-columns: 1fr;
    }
    
    .formats-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: var(--spacing-md);
    }
    
    .feature-list {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .feature-showcase {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .language-selector {
        position: static;
        margin-bottom: var(--spacing-lg);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .formats-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-showcase {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
}

/* RTL Support */
[dir="rtl"] {
    .mode-features li,
    .tech-card li {
        padding-left: 0;
        padding-right: var(--spacing-lg);
    }
    
    .mode-features li::before,
    .tech-card li::before {
        left: auto;
        right: 0;
    }
    
    .step {
        flex-direction: row-reverse;
    }
    
    .footer-bottom {
        flex-direction: row-reverse;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.4);
    }
    
    .feature-card,
    .mode-card,
    .tech-card,
    .download-card {
        border: 2px solid var(--border-color);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .language-selector,
    .hero-buttons,
    .download-options {
        display: none;
    }
    
    .hero {
        background: none;
        color: black;
    }
    
    .section-title,
    .hero-title {
        color: black;
    }
}