/* 
 * Serum VST Landing Page - Modern Design 2025
 * Modern UX with glassmorphism, micro-animations, and enhanced accessibility
 */

/* ============================================
   1. CSS Variables & Design Tokens (2025)
   ============================================ */
:root {
    /* Colors - Modern Palette */
    --color-primary: #0066ff;
    --color-primary-dark: #0052cc;
    --color-primary-light: #3385ff;
    --color-accent: #00ccff;
    --color-success: #00d084;
    --color-text: #0a0e27;
    --color-text-secondary: #64748b;
    --color-text-light: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-glass: rgba(255, 255, 255, 0.7);
    --color-border: #e2e8f0;
    --color-shadow-sm: rgba(0, 0, 0, 0.04);
    --color-shadow-md: rgba(0, 0, 0, 0.08);
    --color-shadow-lg: rgba(0, 102, 255, 0.15);
    --color-gradient-primary: linear-gradient(135deg, #0066ff 0%, #00ccff 100%);
    --color-gradient-soft: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #f0f9ff 100%);
    
    /* Spacing System (8px base) */
    --space-xs: 0.5rem;    /* 8px */
    --space-sm: 1rem;      /* 16px */
    --space-md: 1.5rem;    /* 24px */
    --space-lg: 2rem;      /* 32px */
    --space-xl: 3rem;      /* 48px */
    --space-2xl: 4rem;     /* 64px */
    --space-3xl: 6rem;     /* 96px */
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'JetBrains Mono', monospace;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows - Modern Multi-layer */
    --shadow-sm: 0 1px 2px 0 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);
    --shadow-colored: 0 10px 40px rgba(0, 102, 255, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index Scale */
    --z-base: 1;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-tooltip: 1050;
}

/* ============================================
   2. Global Reset & Base Styles
   ============================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-x: hidden;
    font-size: 16px;
}

@media (min-width: 768px) {
    html {
        font-size: 18px;
    }
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-gradient-soft);
    background-attachment: fixed;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ============================================
   3. Layout & Container System
   ============================================ */
.container {
    width: 100%;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}

@media (min-width: 768px) {
    .container {
        padding-left: var(--space-2xl);
        padding-right: var(--space-2xl);
    }
}

.section {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
    position: relative;
}

.section .container {
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-xl);
    padding: var(--space-xl) var(--space-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* Hero section имеет свою подложку через .hero-content, не нужно добавлять еще одну */
.hero .container {
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    border: none;
}

@media (min-width: 768px) {
    .section {
        padding-top: var(--space-2xl);
        padding-bottom: var(--space-2xl);
    }
    
    .section .container {
        padding: var(--space-2xl) var(--space-xl);
    }
}

.section.section-grey .container {
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.9) 0%, rgba(241, 245, 249, 0.9) 100%);
}

/* ============================================
   4. Modern Typography System
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover,
a:focus {
    color: var(--color-primary-dark);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
}

/* ============================================
   5. Modern Navigation (Glassmorphism)
   ============================================ */
.main-nav {
    position: sticky;
    top: 0;
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.main-nav::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 100%);
    z-index: -1;
}

.nav-container {
    width: 100%;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

@media (min-width: 768px) {
    .nav-container {
        height: 80px;
        padding-left: var(--space-2xl);
        padding-right: var(--space-2xl);
    }
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text);
    transition: transform var(--transition-base);
}

.nav-logo:hover {
    transform: scale(1.05);
}

.logo-icon {
    width: 40px;
    height: 40px;
    transition: transform var(--transition-base);
}

.nav-logo:hover .logo-icon {
    transform: rotate(5deg);
}

.nav-menu {
    display: none;
    list-style: none;
    gap: var(--space-xl);
    align-items: center;
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-menu a {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a:focus {
    color: var(--color-primary);
}

.nav-menu a:hover::after,
.nav-menu a:focus::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    z-index: var(--z-modal);
}

@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
}

.mobile-menu-toggle:hover,
.mobile-menu-toggle:focus {
    background: var(--color-bg-alt);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Mobile Menu */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-menu-overlay.active {
    display: block;
    opacity: 1;
}

@media (max-width: 767px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 85%;
        max-width: 320px;
        height: 100vh;
        background: var(--color-bg-glass);
        backdrop-filter: blur(20px) saturate(180%);
        flex-direction: column;
        align-items: flex-start;
        padding: calc(var(--space-2xl) + 72px) var(--space-lg) var(--space-lg);
        gap: var(--space-sm);
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-slow);
        z-index: calc(var(--z-modal) + 1);
        overflow-y: auto;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        width: 100%;
        padding: var(--space-md);
        font-size: 1.1rem;
        border-radius: var(--radius-md);
        transition: all var(--transition-base);
    }
    
    .nav-menu a:hover,
    .nav-menu a:focus {
        background: rgba(0, 102, 255, 0.1);
        color: var(--color-primary);
    }
    
    .nav-menu a::after {
        display: none;
    }
}

/* ============================================
   6. Hero Section (Modern & Spacious)
   ============================================ */
.hero {
    text-align: center;
    padding: var(--space-2xl) 0;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: var(--z-base);
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-xl);
    padding: var(--space-xl) var(--space-lg);
    margin: 0 auto;
    max-width: 1100px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

@media (min-width: 768px) {
    .hero-content {
        padding: var(--space-2xl) var(--space-xl);
    }
}

.hero-logo {
    width: 180px;
    margin: 0 auto var(--space-lg);
    animation: float 6s ease-in-out infinite;
    filter: drop-shadow(0 10px 30px rgba(0, 102, 255, 0.3));
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(2deg);
    }
}

@media (min-width: 768px) {
    .hero-logo {
        width: 240px;
    }
}

.main-title {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero-lead {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin: var(--space-lg) 0;
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .hero-stats {
        flex-direction: row;
        justify-content: center;
        gap: var(--space-2xl);
        padding: var(--space-xl) 0;
    }
}

.stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stat-number {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    background: var(--color-gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.cta-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (min-width: 768px) {
    .cta-section {
        flex-direction: row;
        justify-content: center;
        gap: var(--space-lg);
    }
}

/* ============================================
   7. Modern Buttons (2025 Style)
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    min-height: 52px;
    text-decoration: none;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: var(--color-gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-colored);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-colored);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-text);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: #000;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary:active {
    transform: translateY(0);
}

@media (max-width: 767px) {
    .btn {
        width: 100%;
        padding: var(--space-md) var(--space-lg);
        font-size: 0.95rem;
    }
}

/* ============================================
   8. Modern Cards (Glassmorphism & Shadows)
   ============================================ */
.feature-card,
.spec-category,
.requirement-block,
.producer-card,
.download-card-large,
.faq-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.feature-card::before,
.download-card-large::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: -1;
}

.feature-card:hover,
.alternative-card:hover,
.download-card-large:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), var(--shadow-colored);
    border-color: rgba(0, 102, 255, 0.3);
}

.feature-card:hover::before,
.download-card-large:hover::before {
    opacity: 0.03;
}

.producer-card:hover,
.faq-item:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

@media (min-width: 992px) {
    .feature-card:hover,
    .alternative-card:hover,
    .download-card-large:hover {
        transform: translateY(-8px);
    }
}

.feature-number {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-mono);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
}

.producer-card,
.alternative-card {
    text-align: left;
    display: flex;
    flex-direction: column;
    padding: var(--space-xl);
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    height: 100%;
}

.alternative-card h3 {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    margin-bottom: var(--space-md);
    color: var(--color-text);
    font-weight: 700;
}

.alternative-card p {
    flex-grow: 1;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
    font-size: 1.05rem;
}

.alternative-meta {
    margin-top: auto;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.price-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-gradient-primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.producer-icon {
    font-size: 2.5rem;
    line-height: 1;
    margin-bottom: var(--space-xs);
    filter: grayscale(0.3);
    transition: transform var(--transition-base), filter var(--transition-base);
}

.producer-card:hover .producer-icon {
    transform: scale(1.2) rotate(5deg);
    filter: grayscale(0);
}

.producer-card strong {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    display: block;
    margin: 0;
}

.producer-card span {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

.faq-item h3 {
    margin-bottom: var(--space-md);
    font-size: 1.25rem;
}

.faq-item p {
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.7;
}

/* ============================================
   9. Grid Systems
   ============================================ */
.features-grid,
.specs-grid,
.requirements-blocks,
.producers-grid,
.alternatives-grid,
.download-grid {
    display: grid;
    gap: var(--space-lg);
    align-items: stretch;
}

@media (min-width: 576px) {
    .producers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .specs-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    .alternatives-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    .requirements-blocks {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    .producers-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .download-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .specs-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    .alternatives-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    .requirements-blocks {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
}

/* ============================================
   10. Section Headers
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    margin-bottom: var(--space-md);
}

.section-header .section-lead {
    margin-top: var(--space-md);
}

.section-header.centered {
    text-align: center;
}

.section-lead {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-top: var(--space-md);
}

.text-block {
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.large-text {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    line-height: 1.7;
}

/* ============================================
   11. Two Column Layout
   ============================================ */
.two-column {
    display: grid;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

@media (min-width: 768px) {
    .two-column {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xl);
    }
}

/* ============================================
   12. Capabilities List
   ============================================ */
.capability {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.capability:last-child {
    border-bottom: none;
}

.capability-icon {
    font-size: 2.5rem;
}

@media (min-width: 576px) {
    .capability {
        flex-direction: row;
        align-items: flex-start;
        gap: var(--space-lg);
    }
    .capability-icon {
        font-size: 3rem;
        margin-right: var(--space-md);
    }
}

/* ============================================
   13. Specs & Requirements (Modern Cards)
   ============================================ */
.spec-category,
.requirement-block {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    padding: var(--space-lg);
    border-left: 4px solid var(--color-primary);
    margin: 0;
    width: 100%;
    box-sizing: border-box;
}

@media (min-width: 768px) {
    .spec-category,
    .requirement-block {
        padding: var(--space-xl) var(--space-lg);
    }
}

.spec-category h3,
.requirement-block h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    padding-bottom: var(--space-md);
    margin-bottom: var(--space-lg);
    border-bottom: 2px solid var(--color-primary);
    color: var(--color-primary);
    position: relative;
    font-weight: 700;
}

.spec-category ul,
.requirement-block ul {
    list-style: none;
    padding-left: 0;
    margin-left: 0;
}

.spec-category li,
.requirement-block li {
    padding: var(--space-md) 0;
    padding-left: 0;
    display: flex;
    align-items: flex-start;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    line-height: 1.6;
    font-size: 1rem;
}

@media (min-width: 768px) {
    .spec-category li,
    .requirement-block li {
        padding: var(--space-sm) 0;
        font-size: 1.05rem;
    }
}

.spec-category li:hover,
.requirement-block li:hover {
    color: var(--color-text);
}

.spec-category li::before,
.requirement-block li::before {
    content: '✓';
    color: var(--color-success);
    font-weight: bold;
    margin-right: var(--space-md);
    font-size: 1.125rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.spec-category li strong,
.requirement-block li strong {
    margin-right: var(--space-xs);
    font-weight: 600;
}

/* ============================================
   14. Comparison Table (Modern Design)
   ============================================ */
.comparison-table {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    font-size: 0.95rem;
    box-shadow: var(--shadow-md);
    background: var(--color-bg);
}

.comparison-header,
.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    text-align: center;
}

.comparison-header {
    background: var(--color-gradient-primary);
    color: white;
    font-weight: 600;
}

.comparison-row {
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-fast);
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-row:nth-child(even) {
    background-color: var(--color-bg-alt);
}

.comparison-row:hover {
    background-color: rgba(0, 102, 255, 0.05);
}

.comparison-cell {
    padding: var(--space-md) var(--space-lg);
}

.comparison-cell:first-child {
    text-align: left;
    font-weight: 600;
}

.comparison-cell.highlight {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    font-weight: 600;
    color: var(--color-primary);
}

.comparison-header .comparison-cell.highlight {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* ============================================
   15. Download Section (Premium Cards)
   ============================================ */
.download-badge {
    display: inline-block;
    background: var(--color-gradient-primary);
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-md);
}

.download-features {
    list-style: none;
    margin: var(--space-lg) 0;
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    flex-grow: 1;
}

.download-features li {
    padding: var(--space-sm) 0;
    display: flex;
    align-items: center;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.download-features li:hover {
    color: var(--color-text);
}

.download-features li::before {
    content: '✓';
    color: var(--color-success);
    margin-right: var(--space-sm);
    font-weight: bold;
    font-size: 1.125rem;
}

.download-card-large {
    position: relative;
    padding: var(--space-xl);
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.download-card-large h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--space-sm);
    background: var(--color-gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

.download-price {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.download-buttons {
    margin-top: auto;
    padding-top: var(--space-md);
}

.download-info {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    margin-top: var(--space-lg);
    border: 1px solid var(--color-border);
}

@media (min-width: 576px) {
    .download-info {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
}

@media (min-width: 992px) {
    .download-info {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ============================================
   16. Screenshot Section
   ============================================ */
.serum-screenshot {
    margin: var(--space-2xl) 0;
}

.serum-screenshot img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    width: 100%;
}

.serum-screenshot img:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow-xl), var(--shadow-colored);
}

.screenshot-caption {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: var(--space-md);
    font-style: italic;
}

/* ============================================
   17. Footer (Modern & Clean)
   ============================================ */
.footer {
    background: linear-gradient(135deg, var(--color-text) 0%, #1a1f35 100%);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--space-3xl) 0 var(--space-2xl);
    font-size: 0.95rem;
    margin-top: var(--space-3xl);
}

.footer h4 {
    color: white;
    font-size: 1.125rem;
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

.footer a:hover,
.footer a:focus {
    color: white;
}

.footer-content {
    display: grid;
    gap: var(--space-xl);
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--space-sm);
}

.footer-bottom {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

.disclaimer {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    margin-top: var(--space-lg);
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   18. Background Effects (Performance Optimized)
   ============================================ */
.wave-canvas,
.particle-container {
    display: none;
}

@media (min-width: 1024px) {
    .wave-canvas,
    .particle-container {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 0;
        pointer-events: none;
    }
    
    .wave-canvas {
        opacity: 0.3;
    }
    
    .particle {
        position: absolute;
        width: 4px;
        height: 4px;
        background: var(--color-gradient-primary);
        border-radius: 50%;
        opacity: 0;
        animation: particleFloat 15s infinite ease-in-out;
        box-shadow: 0 0 10px rgba(0, 102, 255, 0.5);
    }
    
    @keyframes particleFloat {
        0% {
            transform: translateY(100vh) translateX(0) scale(0);
            opacity: 0;
        }
        10% {
            opacity: 0.8;
        }
        50% {
            opacity: 1;
        }
        90% {
            opacity: 0.5;
        }
        100% {
            transform: translateY(-100px) translateX(100px) scale(1.5);
            opacity: 0;
        }
    }
}

/* ============================================
   19. Mobile Optimizations (2025 UX)
   ============================================ */
@media (max-width: 767px) {
    .section {
        padding-top: var(--space-xl);
        padding-bottom: var(--space-xl);
    }
    
    .section .container {
        padding: var(--space-xl) var(--space-lg);
    }
    
    .hero {
        padding: var(--space-xl) 0;
    }
    
    .hero-logo {
        width: 140px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
        padding: var(--space-lg) 0;
    }
    
    .features-grid,
    .specs-grid,
    .alternatives-grid,
    .producers-grid,
    .requirements-blocks,
    .download-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .two-column {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .capability {
        flex-direction: column;
        padding: var(--space-md) 0;
    }
    
    .feature-card,
    .spec-category,
    .requirement-block,
    .download-card-large,
    .faq-item {
        padding: var(--space-lg);
    }
    
    .download-card-large {
        padding: var(--space-lg);
    }
    
    .spec-category,
    .requirement-block {
        padding: var(--space-lg);
    }
    
    /* Disable heavy effects on mobile */
    .wave-canvas,
    .particle-container {
        display: none !important;
    }
    
    .feature-card:hover,
    .download-card-large:hover,
    .alternative-card:hover {
        transform: none !important;
    }
    
    .comparison-table {
        font-size: 0.85rem;
    }
    
    .comparison-cell {
        padding: var(--space-sm) var(--space-md);
    }
}

@media (max-width: 480px) {
    .container {
        padding-left: var(--space-md);
        padding-right: var(--space-md);
    }
    
    .nav-container {
        padding-left: var(--space-md);
        padding-right: var(--space-md);
    }
    
    .section {
        padding-top: var(--space-lg);
        padding-bottom: var(--space-lg);
    }
    
    .hero {
        padding: var(--space-lg) 0;
    }
    
    .hero-logo {
        width: 120px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .feature-card,
    .download-card-large {
        padding: var(--space-md);
    }
}

/* ============================================
   20. Accessibility & Focus States
   ============================================ */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

/* ============================================
   21. Print Styles
   ============================================ */
@media print {
    .main-nav,
    .download-section,
    .footer,
    .wave-canvas,
    .particle-container {
        display: none;
    }
    
    body {
        background: white;
    }
}