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

:root {
    /* Premium Color Palette */
    --primary-color: #0056b3;
    --primary-dark: #004085;
    --primary-light: #0066cc;
    --secondary-color: #1a2332;
    --accent-color: #0d6efd;
    --accent-light: #4dabf7;
    
    /* Text Colors - Light Backgrounds */
    --text-primary: #1a1a1a;
    --text-secondary: #4a5568;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    
    /* Text Colors - Dark Backgrounds */
    --text-on-dark: #ffffff;
    --text-on-dark-secondary: #e5e7eb;
    --text-on-dark-light: #d1d5db;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    --bg-dark-secondary: #1e293b;
    
    /* Border & Divider Colors */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --border-dark: #334155;
    
    /* Status Colors */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #3b82f6;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 17px;
    --line-height-base: 1.7;
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.02em;
    
    /* Spacing - Premium Scale */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    --spacing-xxxl: 6rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 2rem;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Premium Shadows */
    --box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --box-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --box-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --box-shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --box-shadow-dark: 0 10px 30px rgba(0, 0, 0, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Animation Durations */
    --animation-duration-fast: 0.2s;
    --animation-duration-base: 0.4s;
    --animation-duration-slow: 0.6s;
    
    /* Premium Effects */
    --glow-intensity: 0.1;
    --shimmer-duration: 3s;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

/* Smooth scroll with offset for sticky header */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: var(--letter-spacing-normal);
    font-weight: 400;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 86, 179, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(13, 110, 253, 0.03) 0%, transparent 50%);
    background-attachment: fixed;
    position: relative;
}

/* Subtle animated background particles */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20% 30%, rgba(0, 86, 179, 0.15), transparent),
        radial-gradient(2px 2px at 60% 70%, rgba(13, 110, 253, 0.1), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(0, 86, 179, 0.1), transparent);
    background-size: 200% 200%;
    animation: backgroundShift 20s ease infinite;
    pointer-events: none;
    z-index: 0;
    opacity: 0.3;
}

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

main {
    position: relative;
    z-index: 1;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 100;
    border-radius: 0 0 var(--border-radius) 0;
}

.skip-link:focus {
    top: 0;
}

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

/* Header and Navigation */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--box-shadow-md);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--box-shadow-lg);
    background: rgba(255, 255, 255, 0.98);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
    min-height: 70px;
}

.logo {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.35rem;
    display: flex;
    align-items: center;
    line-height: 1;
    letter-spacing: var(--letter-spacing-tight);
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    margin: 0;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    position: relative;
    display: inline-block;
    padding: 0.5rem 0;
    letter-spacing: var(--letter-spacing-normal);
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-on-dark);
    padding: var(--spacing-xxxl) 0 var(--spacing-xxl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { opacity: 0.5; transform: scale(1); }
    100% { opacity: 0.8; transform: scale(1.1); }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.15;
    letter-spacing: var(--letter-spacing-tight);
    color: var(--text-on-dark);
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    max-width: 900px;
    margin: 0 auto var(--spacing-md);
    color: var(--text-on-dark-secondary);
    line-height: 1.75;
    font-weight: 400;
}

.hero-subtitle strong {
    color: var(--text-on-dark);
    font-weight: 600;
}

.hero-subtitle a {
    color: var(--text-on-dark);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: opacity var(--transition-fast);
}

.hero-subtitle a:hover {
    opacity: 0.9;
}

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

section:nth-child(even) {
    background-color: var(--bg-secondary);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: var(--letter-spacing-tight);
}

h3 {
    font-size: clamp(1.35rem, 3vw, 1.875rem);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
    color: var(--text-primary);
    letter-spacing: var(--letter-spacing-tight);
    line-height: 1.3;
}

h4 {
    font-size: clamp(1.15rem, 2vw, 1.4rem);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
    color: var(--text-primary);
    letter-spacing: var(--letter-spacing-normal);
    line-height: 1.4;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 400;
    line-height: 1.75;
}

strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Lists */
ul, ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    line-height: 1.75;
}

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

.platform-list,
.evaluation-list,
.benefits-list,
.problems-list,
.strengths-list,
.considerations-list,
.rankings-list,
.tco-list {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.platform-list li,
.evaluation-list li,
.benefits-list li,
.problems-list li {
    padding-left: var(--spacing-md);
    position: relative;
}

.platform-list li::before,
.evaluation-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.benefits-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: 700;
    font-size: 1.1em;
}

.problems-list li::before {
    content: '⚠';
    position: absolute;
    left: 0;
    color: var(--warning-color);
    font-weight: 700;
    font-size: 1.1em;
}

.evaluation-list {
    counter-reset: evaluation-counter;
}

.evaluation-list li {
    counter-increment: evaluation-counter;
    padding-left: 2rem;
}

.evaluation-list li::before {
    content: counter(evaluation-counter) '.';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.strengths-list ul,
.considerations-list ul {
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-md);
}

/* Platform Cards */
.platform-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--box-shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.platform-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 86, 179, 0.02) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.platform-card:hover::after {
    opacity: 1;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 1;
}

.platform-card::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color), var(--primary-color));
    border-radius: var(--border-radius-lg);
    opacity: 0;
    z-index: -1;
    transition: opacity var(--transition-base);
    filter: blur(8px);
}

.platform-card:hover {
    transform: translateY(-4px) scale(1.01);
    box-shadow: var(--box-shadow-xl);
    border-color: var(--primary-color);
}

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

.platform-card:hover::after {
    opacity: 0.3;
}

.platform-card.featured::before {
    opacity: 1;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--primary-color));
    background-size: 200% 100%;
    animation: shimmer var(--shimmer-duration) ease-in-out infinite;
}

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

.platform-card.featured {
    border: 2px solid var(--primary-color);
    background: linear-gradient(to bottom, rgba(0, 86, 179, 0.03), var(--bg-primary));
    box-shadow: var(--box-shadow-lg);
}

.platform-card.featured::before {
    opacity: 1;
}

.platform-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    white-space: nowrap;
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    box-shadow: var(--box-shadow);
}

.badge-featured {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--text-on-dark);
    box-shadow: var(--box-shadow-md);
}

.platform-focus {
    font-style: italic;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

/* Comparison Table */
.comparison-table-section {
    overflow-x: auto;
}

.table-wrapper {
    overflow-x: auto;
    margin: var(--spacing-xl) 0;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-lg);
    border: 1px solid var(--border-color);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    min-width: 800px;
}

.comparison-table thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--text-on-dark);
}

.comparison-table th {
    padding: 1.25rem var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    font-size: 0.85rem;
    color: var(--text-on-dark);
}

.comparison-table tbody tr {
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.comparison-table tbody tr:hover {
    background-color: var(--bg-secondary);
    transform: scale(1.01);
}

.comparison-table tbody tr.highlight-row {
    background: linear-gradient(90deg, rgba(0, 86, 179, 0.08) 0%, rgba(0, 86, 179, 0.03) 100%);
    font-weight: 600;
    border-left: 3px solid var(--primary-color);
}

.comparison-table tbody tr.highlight-row:hover {
    background: linear-gradient(90deg, rgba(0, 86, 179, 0.12) 0%, rgba(0, 86, 179, 0.06) 100%);
}

.comparison-table td {
    padding: 1.25rem var(--spacing-md);
    color: var(--text-secondary);
    vertical-align: middle;
}

.comparison-table th[scope="row"] {
    font-weight: 600;
    color: var(--text-primary);
}

.stars {
    font-size: 1.1rem;
    letter-spacing: 2px;
}

.comparison-table small {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* Criterion Sections */
.criterion {
    background: var(--bg-primary);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-md);
}

.criterion h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    margin-bottom: var(--spacing-lg);
    line-height: var(--line-height-base);
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* FAQ Section */
.faq-section {
    background: var(--bg-secondary);
}

.faq-item {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--box-shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--border-light);
}

.faq-item:hover {
    box-shadow: var(--box-shadow-lg);
    border-color: var(--border-color);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
}

.faq-item p {
    margin-bottom: var(--spacing-xs);
}

.faq-item ul,
.faq-item ol {
    margin-top: var(--spacing-sm);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-on-dark);
    text-align: center;
    padding: var(--spacing-xxxl) 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.cta-section .container {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    color: var(--text-on-dark);
    margin-bottom: var(--spacing-lg);
}

.cta-section p {
    color: var(--text-on-dark-secondary);
    font-size: 1.15rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

/* CTA Buttons */
.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.cta-button-primary,
.cta-button-secondary {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    font-size: 1.05rem;
    border: 2px solid transparent;
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    font-size: 0.9rem;
}

.cta-button-primary {
    background: var(--text-on-dark);
    color: var(--primary-color);
    border-color: var(--text-on-dark);
    box-shadow: var(--box-shadow-lg);
}

.cta-button-primary:hover,
.cta-button-primary:focus {
    background: var(--text-on-dark-secondary);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--box-shadow-xl);
    color: var(--primary-dark);
}

.cta-button-primary:active {
    transform: translateY(0) scale(0.98);
}

.cta-button-secondary {
    background: transparent;
    color: var(--text-on-dark);
    border-color: var(--text-on-dark);
}

.cta-button-secondary:hover,
.cta-button-secondary:focus {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--box-shadow-lg);
    border-color: var(--text-on-dark-secondary);
}

.cta-button-secondary:active {
    transform: translateY(0) scale(0.98);
}

.cta-button {
    display: inline-block;
    padding: 0.875rem 2rem;
    background: var(--primary-color);
    color: var(--text-on-dark) !important;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    margin-top: var(--spacing-md);
    box-shadow: var(--box-shadow-md);
    letter-spacing: var(--letter-spacing-wide);
    font-size: 0.95rem;
    border: none;
}

.cta-button:hover,
.cta-button:focus {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
    color: var(--text-on-dark) !important;
}

.cta-link {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 2px solid var(--primary-color);
    transition: all var(--transition-fast);
    display: inline-block;
    margin-top: var(--spacing-sm);
}

.cta-link:hover,
.cta-link:focus {
    color: var(--primary-dark);
    border-bottom-color: var(--primary-dark);
    transform: translateX(4px);
}

.cta-inline {
    margin-top: var(--spacing-md);
    text-align: center;
}

.cta-section-inline {
    margin: var(--spacing-lg) 0;
    text-align: center;
}

/* Platform card links */
.platform-card a,
.criterion a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-fast);
}

.platform-card a:hover,
.platform-card a:focus,
.criterion a:hover,
.criterion a:focus {
    border-bottom-color: var(--primary-color);
    color: var(--primary-dark);
}

/* Competitor links - subtle, helpful style */
.competitor-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    display: inline-block;
    margin-top: var(--spacing-sm);
}

.competitor-link:hover,
.competitor-link:focus {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Links in dark sections */
.hero a,
.cta-section a {
    color: var(--text-on-dark);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: opacity var(--transition-fast);
}

.hero a:hover,
.cta-section a:hover {
    opacity: 0.9;
}

.hero a strong,
.cta-section a strong {
    color: var(--text-on-dark);
}

/* Ensure buttons in platform cards have proper contrast */
.platform-card .cta-button,
.criterion .cta-button,
.cta-inline .cta-button,
.cta-section-inline .cta-button {
    background: var(--primary-color);
    color: var(--text-on-dark) !important;
    border: none;
}

.platform-card .cta-button:hover,
.criterion .cta-button:hover,
.cta-inline .cta-button:hover,
.cta-section-inline .cta-button:hover {
    background: var(--primary-dark);
    color: var(--text-on-dark) !important;
}

/* Checklist Items */
.checklist-item {
    background: var(--bg-primary);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-md);
    transition: all var(--transition-base);
    position: relative;
}

.checklist-item:hover {
    box-shadow: var(--box-shadow-lg);
    transform: translateX(4px);
}

/* Glossary Styles */
.glossary-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.glossary-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--box-shadow-md);
    transition: all var(--transition-base);
}

.glossary-item:hover {
    box-shadow: var(--box-shadow-lg);
    border-color: var(--primary-color);
}

.glossary-item dt {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--border-light);
}

.glossary-item dd {
    margin: 0;
    padding-top: var(--spacing-md);
    color: var(--text-secondary);
    line-height: var(--line-height-base);
}

.glossary-item dd p {
    margin-bottom: var(--spacing-sm);
}

.glossary-item dd p:last-child {
    margin-bottom: 0;
}

.glossary-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Data Standard Table */
.data-standard-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-xl) 0;
    background: var(--bg-primary);
    box-shadow: var(--box-shadow-md);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.data-standard-table thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--text-on-dark);
}

.data-standard-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-on-dark);
}

.data-standard-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
}

.data-standard-table tbody tr:hover {
    background: var(--bg-secondary);
}

.data-standard-table code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--primary-color);
}

/* Code Block */
.code-block {
    background: var(--bg-dark);
    color: var(--text-on-dark);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-xl) 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.code-block code {
    color: var(--text-on-dark);
    background: transparent;
    padding: 0;
}

/* Pitfall Items */
.pitfall-item {
    background: var(--bg-primary);
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-md);
}

.pitfall-item h2 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: var(--spacing-md);
}

.pitfall-item ul {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.pitfall-item li {
    margin-bottom: var(--spacing-xs);
}

/* Calculator Styles */
.calculator-wrapper {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    box-shadow: var(--box-shadow-md);
}

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

.calculator-inputs label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: block;
}

.calculator-inputs input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.calculator-inputs input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
}

.calculator-inputs button {
    grid-column: 1 / -1;
    margin-top: var(--spacing-sm);
}

.calculator-results {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--border-color);
}

.calculator-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
}

.calculator-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

.calculator-table .result-row {
    background: var(--bg-secondary);
    font-weight: 600;
}

.calculator-table .result-row td {
    border-bottom: 2px solid var(--primary-color);
    font-size: 1.1rem;
}

.calculator-error {
    color: var(--error-color);
    padding: var(--spacing-md);
    background: rgba(239, 68, 68, 0.1);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--error-color);
}

.calculator-note {
    margin-top: var(--spacing-md);
    color: var(--text-light);
    font-style: italic;
}

.checklist-item h3 {
    color: var(--primary-color);
    margin-top: 0;
}

.checklist-item blockquote {
    border-left: 4px solid var(--accent-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    font-style: italic;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.checklist-item blockquote p {
    margin: 0;
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.checklist-item blockquote strong {
    color: var(--text-primary);
    font-weight: 600;
}

.checklist-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: var(--text-on-dark);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

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

.footer-section h3,
.footer-section h4 {
    color: var(--text-on-dark);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    letter-spacing: var(--letter-spacing-tight);
}

.footer-section p {
    color: var(--text-on-dark-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
    margin-left: 0;
}

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

.footer-section a {
    color: var(--text-on-dark-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-weight: 400;
}

.footer-section a:hover {
    color: var(--text-on-dark);
}

.footer-bottom {
    border-top: 1px solid var(--border-dark);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--text-on-dark-light);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --spacing-xxl: 2.5rem;
        --spacing-xl: 2rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--box-shadow-lg);
        display: none;
        gap: var(--spacing-sm);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        padding: var(--spacing-sm);
    }
    
    .comparison-table {
        font-size: 0.9rem;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm);
    }
    
    .platform-header {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    section {
        padding: var(--spacing-lg) 0;
    }
    
    .platform-card {
        padding: var(--spacing-md);
    }
    
    .comparison-table {
        font-size: 0.85rem;
        min-width: 600px;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .mobile-menu-toggle,
    .skip-link {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .platform-card {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .comparison-table {
        font-size: 10pt;
    }
}

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

/* Focus Styles for Keyboard Navigation */
a:focus,
button:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 3px;
    border-radius: 4px;
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.2);
}

a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 3px;
}

/* Loading States */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Skeleton Loading */
@keyframes skeleton-loading {
    0% { background-position: -200px 0; }
    100% { background-position: calc(200px + 100%) 0; }
}

.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 0px, var(--bg-tertiary) 40px, var(--bg-secondary) 80px);
    background-size: 200px 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

/* Micro-interactions */
.interactive-element {
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.interactive-element:active {
    transform: scale(0.98);
}

/* Smooth reveal animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp var(--animation-duration-base) ease-out;
}

/* Stagger animation delays */
.fade-in-up:nth-child(1) { animation-delay: 0.1s; }
.fade-in-up:nth-child(2) { animation-delay: 0.2s; }
.fade-in-up:nth-child(3) { animation-delay: 0.3s; }
.fade-in-up:nth-child(4) { animation-delay: 0.4s; }
.fade-in-up:nth-child(5) { animation-delay: 0.5s; }

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    .platform-card {
        border-width: 2px;
    }
}

/* Premium Scrollbar */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    border-radius: 6px;
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--primary-dark), var(--primary-color));
}

/* Selection Styling */
::selection {
    background: var(--primary-color);
    color: var(--text-on-dark);
}

::-moz-selection {
    background: var(--primary-color);
    color: var(--text-on-dark);
}

/* Print Optimizations */
@media print {
    body::before {
        display: none;
    }
    
    .header,
    .footer,
    .cta-section,
    .cta-button,
    .cta-link {
        display: none;
    }
    
    .platform-card {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

/* 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;
        scroll-behavior: auto !important;
    }
    
    body::before {
        animation: none !important;
    }
    
    .hero::before {
        animation: none !important;
    }
    
    .platform-card.featured::before {
        animation: none !important;
    }
}