/* Expense Tracker Specific Styles */

/* Base styles */
:root {
    --primary-color: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #818CF8;
    --secondary-color: #0EA5E9;
    --secondary-dark: #0284C7;
    --accent-color: #F472B6;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --background: #F8FAFC;
    --card-bg: rgba(255, 255, 255, 0.9);
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    
    /* Dark theme colors */
    --dark-bg: #0F172A;
    --dark-card-bg: rgba(30, 41, 59, 0.9);
    --dark-text-primary: #F1F5F9;
    --dark-text-secondary: #94A3B8;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Mobile-specific spacing */
    --mobile-spacing-xs: 0.25rem;
    --mobile-spacing-sm: 0.5rem;
    --mobile-spacing-md: 1rem;
    --mobile-spacing-lg: 1.5rem;
    --mobile-spacing-xl: 2rem;
}

/* Dark theme */
.dark-theme {
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --background: var(--dark-bg);
    --card-bg: var(--dark-card-bg);
}

/* App Header */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-bar {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.theme-toggle,
.share-btn {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: none;
    padding: 0.5rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.3s ease;
}

.theme-toggle:hover,
.share-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

/* App Badges */
.app-badges {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.app-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.app-badge.premium {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: white;
}

.app-badge.new {
    background: linear-gradient(135deg, #10B981, #059669);
    color: white;
}

/* App Stats */
.app-stats {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin: var(--spacing-lg) 0;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.2);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0.5rem 0;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* Button Subtitle */
.btn-subtitle {
    display: flex;
    flex-direction: column;
    font-size: 0.85rem;
    margin-left: 8px;
    line-height: 1.3;
    text-align: left;
}

.btn-subtitle::before {
    content: '📱';
    font-size: 1rem;
    margin-right: 4px;
}

/* Feature Details */
.feature-details {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-sm);
    text-align: left;
}

.feature-details li {
    padding: 0.25rem 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feature-details li::before {
    content: '✓';
    color: var(--success);
    font-weight: bold;
}

/* Reviews Section */
.app-reviews {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--background);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.review-card {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.review-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.review-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.review-rating {
    color: #F59E0B;
    margin-top: 0.25rem;
}

/* CTA Section */
.app-cta {
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    background: var(--primary-dark);
}

/* Social Share */
.social-share {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.social-link {
    color: white;
    background: rgba(255, 255, 255, 0.1);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

/* Footer Links */
.footer-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-stats {
        flex-direction: column;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .footer-links {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .app-header,
    .app-actions,
    .back-to-top,
    .theme-toggle,
    .share-btn {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .app-hero {
        background: none;
        color: black;
    }
    
    .feature-item,
    .review-card {
        break-inside: avoid;
        border: 1px solid #ddd;
    }
}

/* App Hero Section */
.app-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: var(--spacing-xl) var(--spacing-md);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><circle cx="50" cy="50" r="40" stroke="rgba(255,255,255,0.1)" stroke-width="2" fill="none"/></svg>') repeat;
    opacity: 0.1;
    animation: rotate 20s linear infinite;
}

.app-icon-large {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    animation: float 3s ease-in-out infinite;
    background: linear-gradient(135deg, #ffffff, #e2e8f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-info {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    width: 100%;
    padding: 0 var(--spacing-md);
}

.app-info h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(to right, #ffffff, #e2e8f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeInUp 1s ease-out;
}

.app-tagline {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

/* Platform Badges */
.platform-badges {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease-out 0.4s backwards;
}

.platform-badge {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

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

/* App Actions */
.app-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1s ease-out 0.6s backwards;
}

.download-btn-large, .preview-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
    font-size: 1.1rem;
}

.download-btn-large:hover, .preview-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.download-btn-large:active, .preview-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(16, 185, 129, 0.3);
}

.download-btn-large i, .preview-btn i {
    font-size: 1.4rem;
    transition: transform 0.3s ease;
}

.download-btn-large:hover i, .preview-btn:hover i {
    transform: translateY(-2px);
}

.download-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    display: none;
    border-radius: 0 0 12px 12px;
    overflow: hidden;
}

.download-progress.active {
    display: block;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--success), #45a049);
    width: 0;
    transition: width 0.3s ease;
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    animation: progress-shine 1.5s infinite;
}

@keyframes progress-shine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Screenshots Section */
.app-screenshots {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--background);
    position: relative;
    overflow: hidden;
}

.app-screenshots::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to bottom, var(--primary-color), transparent);
    opacity: 0.1;
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.screenshot-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.screenshot-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.screenshot {
    width: 100%;
    height: auto;
    display: block;
    transition: all 0.3s ease;
}

.screenshot-card:hover .screenshot {
    transform: scale(1.05);
}

.screenshot-caption {
    padding: var(--spacing-sm);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(5px);
}

/* Features Section */
.app-features {
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(to bottom, var(--background), white);
    position: relative;
    overflow: hidden;
}

.app-features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><circle cx="50" cy="50" r="40" stroke="rgba(99,102,241,0.1)" stroke-width="2" fill="none"/></svg>') repeat;
    opacity: 0.1;
    animation: rotate 20s linear infinite;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.feature-item {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: float 3s ease-in-out infinite;
}

/* Technical Details Section */
.technical-details {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--background);
    position: relative;
    overflow: hidden;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.tech-item {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.tech-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

.tech-table td {
    padding: var(--spacing-sm);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.tech-table code {
    background: rgba(0, 0, 0, 0.05);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    font-family: monospace;
    transition: all 0.3s ease;
}

.tech-table code:hover {
    background: rgba(0, 0, 0, 0.1);
}

.tech-list {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-md);
}

.tech-list li {
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.tech-list li:hover {
    transform: translateX(5px);
}

/* Contribution Section */
.contribution {
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(to bottom, white, var(--background));
    position: relative;
    overflow: hidden;
}

.contribution-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.contribution-steps {
    list-style: none;
    padding: 0;
    margin: var(--spacing-lg) 0;
}

.contribution-steps li {
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.contribution-steps li:hover {
    transform: translateX(5px);
}

.github-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.github-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* App Footer */
.app-footer {
    background: linear-gradient(to right, var(--text-primary), var(--primary-dark));
    color: white;
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.app-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><circle cx="50" cy="50" r="40" stroke="rgba(255,255,255,0.1)" stroke-width="2" fill="none"/></svg>') repeat;
    opacity: 0.1;
    animation: rotate 20s linear infinite;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.footer-section {
    text-align: center;
}

.footer-section h3 {
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.footer-bottom {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
    opacity: 0.8;
    position: relative;
    z-index: 1;
}

/* Animations */
@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

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

/* Back Button Styles */
.back-button {
    color: white;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.back-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.back-button:hover {
    transform: translateX(-5px);
    background: rgba(255, 255, 255, 0.25);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.back-button:hover::before {
    transform: translateX(100%);
}

.back-button i {
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.back-button:hover i {
    transform: translateX(-3px);
}

/* Mobile Responsive Back Button */
@media (max-width: 768px) {
    .back-button {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
        gap: 0.5rem;
    }

    .back-button i {
        font-size: 1rem;
    }
}

/* Touch Device Optimizations */
@media (hover: none) {
    .back-button:hover {
        transform: none;
    }

    .back-button:active {
        background: rgba(255, 255, 255, 0.25);
        transform: scale(0.98);
    }
}

/* Enhanced Mobile Responsive Design */
@media (max-width: 768px) {
    /* General Mobile Adjustments */
    body {
        font-size: 14px;
    }

    /* Header Adjustments */
    .app-header {
        padding: var(--mobile-spacing-sm);
    }

    .nav-bar {
        padding: 0 var(--mobile-spacing-sm);
    }

    /* Hero Section Mobile */
    .app-hero {
        min-height: auto;
        padding: var(--mobile-spacing-xl) var(--mobile-spacing-sm);
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        position: relative;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
    }

    .app-hero::before {
        opacity: 0.05;
    }

    .app-info {
        width: 100%;
        max-width: 100%;
        padding: 0 var(--mobile-spacing-md);
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .app-icon-large {
        font-size: 4rem;
        margin-bottom: var(--mobile-spacing-md);
        animation: float 4s ease-in-out infinite;
        text-align: center;
    }

    .app-info h1 {
        font-size: 2.25rem;
        line-height: 1.2;
        margin-bottom: var(--mobile-spacing-sm);
        background: linear-gradient(to right, #ffffff, #e2e8f0);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        text-align: center;
        width: 100%;
    }

    .app-tagline {
        font-size: 1.1rem;
        line-height: 1.5;
        margin-bottom: var(--mobile-spacing-lg);
        opacity: 0.95;
        padding: 0 var(--mobile-spacing-sm);
        text-align: center;
        width: 100%;
    }

    .platform-badges {
        margin: var(--mobile-spacing-md) auto;
        gap: var(--mobile-spacing-sm);
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
        max-width: 320px;
    }

    .platform-badge {
        background: rgba(255, 255, 255, 0.15);
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
        backdrop-filter: blur(8px);
        border: 1px solid rgba(255, 255, 255, 0.2);
        text-align: center;
    }

    .app-actions {
        margin-top: var(--mobile-spacing-lg);
        gap: var(--mobile-spacing-sm);
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
        max-width: 320px;
    }

    .download-btn-large,
    .preview-btn {
        padding: 0.9rem 1.5rem;
        font-size: 1rem;
        border-radius: var(--radius-full);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        width: 100%;
        text-align: center;
        justify-content: center;
    }

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

    .preview-btn {
        background: rgba(255, 255, 255, 0.15);
        border: 1px solid rgba(255, 255, 255, 0.3);
    }

    /* Screenshots Mobile */
    .app-screenshots {
        padding: var(--mobile-spacing-xl) var(--mobile-spacing-sm);
    }

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

    .screenshot-card {
        max-width: 100%;
    }

    /* Features Mobile */
    .app-features {
        padding: var(--mobile-spacing-xl) var(--mobile-spacing-sm);
    }

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

    .feature-item {
        padding: var(--mobile-spacing-md);
    }

    /* Technical Details Mobile */
    .technical-details {
        padding: var(--mobile-spacing-xl) var(--mobile-spacing-sm);
    }

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

    .tech-table {
        font-size: 0.875rem;
    }

    /* Contribution Mobile */
    .contribution {
        padding: var(--mobile-spacing-xl) var(--mobile-spacing-sm);
    }

    .contribution-steps li {
        text-align: left;
        justify-content: flex-start;
    }

    /* Footer Mobile */
    .app-footer {
        padding: var(--mobile-spacing-xl) var(--mobile-spacing-sm);
    }

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

    .footer-section {
        padding: 0 var(--mobile-spacing-sm);
    }
}

/* Small Screen Specific Adjustments */
@media (max-width: 480px) {
    .app-hero {
        padding: var(--mobile-spacing-lg) var(--mobile-spacing-xs);
    }

    .app-info {
        padding: 0 var(--mobile-spacing-xs);
    }

    .app-icon-large {
        font-size: 3.5rem;
        margin-bottom: var(--mobile-spacing-sm);
    }

    .app-info h1 {
        font-size: 2rem;
        margin-bottom: var(--mobile-spacing-xs);
        padding: 0 var(--mobile-spacing-xs);
    }

    .app-tagline {
        font-size: 1rem;
        margin-bottom: var(--mobile-spacing-md);
        padding: 0 var(--mobile-spacing-xs);
    }

    .platform-badges {
        max-width: 280px;
    }

    .platform-badge {
        padding: 0.5rem 0.8rem;
        font-size: 0.85rem;
    }

    .app-actions {
        max-width: 280px;
    }

    .download-btn-large,
    .preview-btn {
        padding: 0.8rem 1.2rem;
        font-size: 0.95rem;
    }
}

/* Landscape Mode Adjustments */
@media (max-height: 500px) and (orientation: landscape) {
    .app-hero {
        min-height: auto;
        padding: var(--mobile-spacing-md) var(--mobile-spacing-sm);
    }

    .app-icon-large {
        font-size: 3rem;
        margin-bottom: var(--mobile-spacing-xs);
    }

    .app-info h1 {
        font-size: 1.75rem;
        margin-bottom: var(--mobile-spacing-xs);
    }

    .app-tagline {
        font-size: 0.95rem;
        margin-bottom: var(--mobile-spacing-sm);
    }

    .platform-badges {
        margin: var(--mobile-spacing-xs) 0;
    }

    .app-actions {
        margin-top: var(--mobile-spacing-sm);
    }
}

/* Touch Device Optimizations */
@media (hover: none) {
    .feature-item:hover,
    .screenshot-card:hover,
    .tech-item:hover {
        transform: none;
    }

    .feature-item:active,
    .screenshot-card:active,
    .tech-item:active {
        transform: scale(0.98);
    }

    .download-btn-large:active,
    .preview-btn:active {
        transform: scale(0.98);
    }
}

/* High DPI Screen Optimizations */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .app-icon-large,
    .feature-icon {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}