/*
 * Yuneify Website - Sub-page Styles
 * Modern, accessible, and responsive styles for all sub-pages
 * Updated with enhanced visual hierarchy and improved UX
 * 
 * ARCHITECTURE:
 * - Mobile-first responsive design with clamp() for fluid scaling
 * - Enhanced card system with consistent hover states and accessibility
 * - Performance optimized with GPU acceleration and CSS containment
 * - Comprehensive accessibility support (WCAG AA compliant)
 * - Print-friendly styles for documentation
 * 
 * KEY COMPONENTS:
 * - .enhanced-card: Modern card component with glass morphism
 * - .card-grid: Flexible grid system for different layouts
 * - .features-hero: Featured content showcase section
 * - .testimonial-card: Testimonial display component
 * - .product-card: E-commerce product display
 * - .pricing-card: Pricing plan display
 * 
 * RESPONSIVE BREAKPOINTS:
 * - Extra small: < 480px
 * - Small: 480px - 767px  
 * - Medium: 768px - 1199px
 * - Large: 1200px+
 * 
 * ACCESSIBILITY FEATURES:
 * - Focus indicators for keyboard navigation
 * - Screen reader support with .sr-only class
 * - Reduced motion support
 * - High contrast mode support
 * - Skip links for better navigation
 * 
 * PERFORMANCE OPTIMIZATIONS:
 * - CSS containment for layout performance
 * - GPU acceleration for smooth animations
 * - will-change properties for optimal rendering
 * - Print optimizations
 */

/* ==========================================
   COMMON SUB-PAGE STYLES
   ========================================== */

.sub-page {
    --page-padding-top: clamp(80px, 12vh, 140px);
    --page-padding-bottom: clamp(60px, 10vh, 100px);
    --page-max-width: 1200px;
    --content-max-width: 1000px;
    
    padding-top: var(--page-padding-top);
    padding-bottom: var(--page-padding-bottom);
    min-height: 100vh;
    height: auto;
    position: relative;
    z-index: var(--z-base);
    overflow-x: hidden;
    overflow-y: visible;
    background: linear-gradient(
        180deg,
        rgba(74, 111, 255, 0.02) 0%,
        rgba(74, 206, 255, 0.01) 50%,
        transparent 100%
    );
}

/* Ensure sub-pages work properly when navigated from index */
body:not(.index-page):not(.index-layout) .sub-page,
body.features-page .sub-page,
body.about-page .sub-page,
body.demo-page .sub-page,
body.download-page .sub-page,
body.store-page .sub-page,
body.cart-page .sub-page,
body.buy-page .sub-page,
body.thank-you-page .sub-page,
body.pricing-page .sub-page {
    position: relative;
    overflow-y: visible;
    height: auto;
}

/* Fix center-content positioning for sub-pages */
body:not(.index-page) .center-content {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    transform: none !important;
    height: auto !important;
}

.sub-page-container {
    width: 100%;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
    position: relative;
}

.sub-page-header {
    text-align: center;
    margin-bottom: clamp(3rem, 8vw, 5rem);
    position: relative;
    z-index: var(--z-above);
}

.sub-page-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: clamp(1rem, 3vw, 2rem);
    letter-spacing: -0.03em;
    line-height: 1.1;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    z-index: 1;
}

.sub-page-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: clamp(60px, 15vw, 120px);
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    opacity: 0.7;
}

.sub-page-description {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--neutral);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
    font-weight: 400;
    opacity: 0.9;
}

.sub-page-content {
    margin-bottom: clamp(3rem, 8vw, 5rem);
    position: relative;
    z-index: var(--z-above);
}

/* ==========================================
   ENHANCED CARD SYSTEM
   ========================================== */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
    gap: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: clamp(3rem, 6vw, 4rem);
}

.card-grid--2-col {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 400px), 1fr));
}

.card-grid--3-col {
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
}

.enhanced-card {
    --card-padding: clamp(1.5rem, 4vw, 2.5rem);
    --card-radius: var(--radius-2xl);
    --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --card-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.12);
    
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    padding: var(--card-padding);
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    box-shadow: var(--card-shadow);
    will-change: transform;
}

.enhanced-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.enhanced-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.1) 0%,
        rgba(255, 255, 255, 0.05) 50%,
        transparent 100%
    );
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.enhanced-card:hover {
    transform: translateY(-8px) scale(1.02);
    background: var(--glass-bg-strong);
    box-shadow: var(--card-shadow-hover);
    border-color: rgba(74, 111, 255, 0.3);
}

.enhanced-card:hover::before,
.enhanced-card:hover::after {
    opacity: 1;
}

.enhanced-card:focus-within {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Card variants */
.enhanced-card--featured {
    background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(74, 111, 255, 0.05) 100%);
    border-color: var(--primary);
    border-width: 2px;
    position: relative;
}

.enhanced-card--featured::before {
    opacity: 1;
    height: 4px;
    background: var(--gradient-primary);
}

.enhanced-card--interactive {
    cursor: pointer;
}

.enhanced-card--interactive:active {
    transform: translateY(-4px) scale(1.01);
}

/* ==========================================
   ENHANCED TYPOGRAPHY SYSTEM
   ========================================== */

.card-title {
    font-size: clamp(1.375rem, 3vw, 1.75rem);
    font-weight: 700;
    margin-bottom: clamp(0.75rem, 2vw, 1.25rem);
    line-height: 1.3;
    color: var(--dark);
    letter-spacing: -0.02em;
}

.card-description {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--neutral);
    line-height: 1.7;
    margin-bottom: clamp(1rem, 3vw, 1.5rem);
}

.card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--neutral);
    opacity: 0.8;
}

.card-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* ==========================================
   ENHANCED ICON SYSTEM
   ========================================== */

.enhanced-icon {
    --icon-size: 48px;
    --icon-bg: var(--glass-bg-strong);
    --icon-border: var(--glass-border);
    
    width: var(--icon-size);
    height: var(--icon-size);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--icon-bg);
    border: 1px solid var(--icon-border);
    border-radius: var(--radius-lg);
    margin-bottom: clamp(0.75rem, 2vw, 1rem);
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.enhanced-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.enhanced-icon:hover::before {
    opacity: 0.1;
}

.enhanced-icon--sm { --icon-size: 32px; }
.enhanced-icon--lg { --icon-size: 56px; }
.enhanced-icon--xl { --icon-size: 64px; }

.enhanced-icon svg,
.enhanced-icon span {
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.enhanced-icon:hover svg,
.enhanced-icon:hover span {
    transform: scale(1.1);
}

/* ==========================================
   FEATURES PAGE STYLES
   ========================================== */

.features-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 6vw, 4rem);
    align-items: center;
    margin-bottom: clamp(4rem, 8vw, 6rem);
    padding: clamp(2rem, 6vw, 4rem);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    position: relative;
    overflow: hidden;
}

.features-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
}

.features-hero-content h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: clamp(1rem, 3vw, 1.5rem);
    line-height: 1.2;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-hero-visual {
    background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(74, 206, 255, 0.1) 100%);
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.features-hero-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ==========================================
   ABOUT PAGE STYLES
   ========================================== */

.about-timeline {
    position: relative;
    padding-left: clamp(2rem, 5vw, 3rem);
    margin-bottom: clamp(3rem, 6vw, 4rem);
}

.about-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.timeline-item {
    position: relative;
    padding-bottom: clamp(2rem, 5vw, 3rem);
    margin-left: clamp(1rem, 3vw, 1.5rem);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * clamp(2rem, 5vw, 3rem) - 6px);
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--primary);
}

.timeline-date {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-2);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.timeline-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-3);
    color: var(--dark);
}

.timeline-description {
    font-size: var(--font-size-base);
    color: var(--neutral);
    line-height: 1.7;
}

/* ==========================================
   DOWNLOAD PAGE STYLES
   ========================================== */

.download-hero {
    text-align: center;
    padding: clamp(3rem, 8vw, 5rem);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    margin-bottom: clamp(3rem, 6vw, 4rem);
    position: relative;
    overflow: hidden;
}

.download-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
}

.download-stats {
    display: flex;
    justify-content: center;
    gap: clamp(2rem, 6vw, 4rem);
    margin-top: clamp(2rem, 4vw, 3rem);
    flex-wrap: wrap;
}

.download-stat {
    text-align: center;
}

.download-stat-number {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--primary);
    display: block;
}

.download-stat-label {
    font-size: var(--font-size-sm);
    color: var(--neutral);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

/* ==========================================
   DEMO PAGE STYLES
   ========================================== */

.demo-video-container {
    position: relative;
    background: var(--glass-bg);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    aspect-ratio: 16/9;
    margin-bottom: clamp(2rem, 5vw, 3rem);
    border: 1px solid var(--glass-border);
}

.demo-video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    font-size: clamp(1.125rem, 3vw, 1.375rem);
    font-weight: 600;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
    gap: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: clamp(3rem, 6vw, 4rem);
}

.testimonial-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: clamp(1.5rem, 4vw, 2rem);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

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

.testimonial-quote {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--neutral);
    margin-bottom: var(--spacing-4);
    font-style: italic;
}

.testimonial-author {
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-1);
}

.testimonial-role {
    font-size: var(--font-size-sm);
    color: var(--neutral);
    opacity: 0.8;
}

/* ==========================================
   STORE PAGE STYLES
   ========================================== */

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
    gap: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: clamp(3rem, 6vw, 4rem);
}

.product-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: clamp(1.5rem, 4vw, 2rem);
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(74, 111, 255, 0.3);
}

.product-card:hover::before {
    opacity: 1;
}

.product-header {
    margin-bottom: auto;
}

.product-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-3);
    color: var(--dark);
}

.product-description {
    font-size: var(--font-size-base);
    color: var(--neutral);
    line-height: 1.6;
    margin-bottom: var(--spacing-4);
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--glass-border);
}

.product-price {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--primary);
}

.product-price-old {
    font-size: var(--font-size-sm);
    color: var(--neutral);
    text-decoration: line-through;
    margin-left: var(--spacing-2);
}

/* ==========================================
   PRICING PAGE STYLES
   ========================================== */

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
    gap: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: clamp(3rem, 6vw, 4rem);
}

.pricing-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: clamp(2rem, 5vw, 3rem);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card--featured {
    background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(74, 111, 255, 0.05) 100%);
    border-color: var(--primary);
    border-width: 2px;
    transform: scale(1.05);
}

.pricing-card--featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pricing-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    color: var(--dark);
}

.pricing-price {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: var(--spacing-2);
}

.pricing-period {
    font-size: var(--font-size-base);
    color: var(--neutral);
    margin-bottom: var(--spacing-6);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-8);
}

.pricing-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-3);
    font-size: var(--font-size-base);
    color: var(--neutral);
}

.pricing-feature::before {
    content: '✓';
    color: var(--primary);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

/* ==========================================
   RESPONSIVE DESIGN SYSTEM
   ========================================== */

/* Large screens (1200px+) */
@media (min-width: 1200px) {
    .sub-page-container {
        max-width: var(--page-max-width);
    }
    
    .card-grid {
        gap: 3rem;
    }
    
    .enhanced-card {
        --card-padding: 3rem;
    }
}

/* Medium screens (768px - 1199px) */
@media (max-width: 1199px) {
    .features-hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .card-grid--2-col {
        grid-template-columns: 1fr;
    }
}

/* Small screens (480px - 767px) */
@media (max-width: 767px) {
    .sub-page {
        --page-padding-top: 60px;
        --page-padding-bottom: 40px;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .enhanced-card {
        --card-padding: 1.5rem;
    }
    
    .download-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .testimonial-grid {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card--featured {
        transform: none;
    }
    
    .about-timeline {
        padding-left: 2rem;
    }
    
    .timeline-item {
        margin-left: 1rem;
    }
}

/* Extra small screens (< 480px) */
@media (max-width: 479px) {
    .sub-page-container {
        padding: 0 1rem;
    }
    
    .enhanced-card {
        --card-padding: 1rem;
    }
    
    .product-footer {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .about-timeline {
        padding-left: 1.5rem;
    }
    
    .timeline-item {
        margin-left: 0.5rem;
    }
}

/* ==========================================
   ACCESSIBILITY ENHANCEMENTS
   ========================================== */

/* Focus states */
.enhanced-card:focus-within,
.product-card:focus-within,
.pricing-card:focus-within,
.testimonial-card:focus-within,
.enhanced-card:focus,
.product-card:focus,
.pricing-card:focus,
.testimonial-card:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Skip to content link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .enhanced-card,
    .product-card,
    .pricing-card,
    .testimonial-card,
    .enhanced-icon {
        transition: none;
    }
    
    .enhanced-card:hover,
    .product-card:hover,
    .pricing-card:hover,
    .testimonial-card:hover {
        transform: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high), (prefers-contrast: more) {
    .enhanced-card,
    .product-card,
    .pricing-card,
    .testimonial-card {
        border-width: 2px;
        border-color: var(--dark);
    }
    
    .sub-page-title::after {
        opacity: 1;
    }
}

/* Performance optimizations */
.enhanced-card,
.product-card,
.pricing-card,
.testimonial-card,
.enhanced-icon {
    contain: layout style paint;
}

/* GPU acceleration for animations */
.enhanced-card:hover,
.product-card:hover,
.pricing-card:hover,
.testimonial-card:hover {
    transform: translateZ(0) translateY(-6px) scale(1.01);
}

/* Print styles */
@media print {
    .sub-page {
        background: none;
        padding: 0;
    }
    
    .enhanced-card,
    .product-card,
    .pricing-card,
    .testimonial-card {
        background: white;
        border: 1px solid #ccc;
        box-shadow: none;
        break-inside: avoid;
        transform: none !important;
        will-change: auto;
    }
    
    .enhanced-card:hover,
    .product-card:hover,
    .pricing-card:hover,
    .testimonial-card:hover {
        transform: none !important;
    }
    
    /* Hide interactive elements in print */
    .btn,
    .back-button,
    .mobile-menu-toggle,
    .mobile-menu,
    #background-spirals {
        display: none !important;
    }
}