/* ============================================
   Quest Diagnostics AI-Kaizen Proposal
   Dark Apple-esque Design with SF Pro Font
   ============================================ */

/* CSS Custom Properties (Variables) */
:root {
    /* Colors - Dark Apple Theme */
    --color-primary: #007AFF;
    --color-primary-hover: #0056CC;
    --color-secondary: #5AC8FA;
    --color-accent: #FF453A;
    --color-success: #32D74B;
    --color-warning: #FF9F0A;
    
    /* Background Colors */
    --color-bg-primary: #000000;
    --color-bg-secondary: #1C1C1E;
    --color-bg-tertiary: #2C2C2E;
    --color-bg-quaternary: #3A3A3C;
    --color-bg-elevated: #1C1C1E;
    
    /* Text Colors */
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #EBEBF5;
    --color-text-tertiary: #EBEBF599;
    --color-text-quaternary: #EBEBF54D;
    
    /* Border & Separator Colors */
    --color-border: #38383A;
    --color-separator: #48484A;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #007AFF 0%, #5AC8FA 100%);
    --gradient-hero: linear-gradient(135deg, #1C1C1E 0%, #2C2C2E 100%);
    --gradient-text: linear-gradient(135deg, #007AFF 0%, #5AC8FA 100%);
    
    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    --font-family-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
    
    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Font Sizes */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.1s ease-out;
    --transition-base: 0.2s ease-out;
    --transition-slow: 0.3s ease-out;
    
    /* Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-secondary);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-primary);
    font-weight: var(--font-weight-semibold);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
}

h2 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
}

h3 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-semibold);
}

h4 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
}

h5 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
}

h6 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

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

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

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
}

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

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

@media (min-width: 640px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(28, 28, 30, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: var(--container-2xl);
    margin: 0 auto;
}

.nav-brand h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: 0;
    color: var(--color-text-primary);
}

.nav-brand span {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-regular);
}

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

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-primary);
    background: rgba(0, 122, 255, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 1px;
    transition: all var(--transition-base);
}

/* Mobile Navigation */
@media (max-width: 1023px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg-secondary);
        border-top: 1px solid var(--color-border);
        flex-direction: column;
        padding: var(--spacing-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}

/* Hero Section */
.hero {
    background: var(--gradient-hero);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-3xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(0, 122, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
}

.hero-title {
    font-size: clamp(var(--font-size-4xl), 5vw, var(--font-size-6xl));
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-2xl);
    font-weight: var(--font-weight-regular);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    min-width: 160px;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    padding-top: 80px; /* Account for fixed nav */
}

/* Content Sections */
.content-section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.content-section.bg-dark {
    background: var(--color-bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-tertiary);
    margin-bottom: 0;
    font-weight: var(--font-weight-regular);
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.content-block {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.content-block:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.content-block.full-width {
    grid-column: 1 / -1;
}

.content-block h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}

/* Situation Analysis */
.situation-analysis {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

@media (max-width: 768px) {
    .situation-analysis {
        grid-template-columns: 1fr;
    }
}

.analysis-block {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.analysis-block h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
}

.key-points {
    list-style: none;
    padding: 0;
}

.key-points li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.key-points li::before {
    content: '•';
    color: var(--color-primary);
    font-weight: bold;
    position: absolute;
    left: 0;
    font-size: var(--font-size-lg);
}

/* Statistics Block */
.stat-block {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.stat-item {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--color-border);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-family-primary);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-medium);
}

/* Pain Points Grid */
.pain-points {
    margin-top: var(--spacing-3xl);
}

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

.pain-item {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-accent);
    transition: all var(--transition-base);
}

.pain-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.pain-item h4 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

/* Problem Analysis */
.problem-analysis {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.problem-detail {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.problem-detail h3 {
    color: var(--color-warning);
    margin-bottom: var(--spacing-md);
}

/* Implications */
.implications {
    margin-top: var(--spacing-3xl);
}

.implications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.implication-item {
    background: var(--color-bg-elevated);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    position: relative;
}

.implication-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.implication-item h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

/* Solution Components */
.solution-overview {
    margin-bottom: var(--spacing-3xl);
}

.solution-intro {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.solution-components {
    margin-top: var(--spacing-3xl);
}

.component-item {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.component-header {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.component-header h4 {
    color: var(--color-secondary);
    margin-bottom: 0;
    font-size: var(--font-size-2xl);
}

.component-content {
    padding: var(--spacing-xl);
}

.component-content p {
    margin-bottom: var(--spacing-lg);
}

/* Evidence & Impact */
.evidence-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.evidence-item {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.evidence-item h3 {
    color: var(--color-success);
    margin-bottom: var(--spacing-lg);
}

.scenario-note {
    background: var(--color-bg-tertiary);
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
    font-style: italic;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    border-left: 3px solid var(--color-warning);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.metric {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
}

.metric-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-success);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-family-primary);
}

.metric-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-medium);
}

/* ROI Section */
.roi-section {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-3xl);
}

.roi-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.roi-period {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-success);
}

.roi-period h4 {
    color: var(--color-success);
    margin-bottom: var(--spacing-md);
}

/* Cultural Impact */
.cultural-impact {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.cultural-impact h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Implementation Phases */
.governance-structure {
    margin-bottom: var(--spacing-3xl);
}

.roles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.role-item {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.role-item h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.role-item strong {
    color: var(--color-secondary);
}

/* Implementation Phases */
.implementation-phases {
    margin-top: var(--spacing-3xl);
}

.phase-item {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-2xl);
    overflow: hidden;
}

.phase-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.phase-number {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    font-family: var(--font-family-primary);
}

.phase-info h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-2xl);
}

.phase-duration {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

.phase-content {
    padding: var(--spacing-xl);
}

.phase-content h5 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.phase-content h5:first-child {
    margin-top: 0;
}

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

.activity {
    background: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.activity strong {
    color: var(--color-warning);
    display: block;
    margin-bottom: var(--spacing-md);
}

.activity ul {
    margin-bottom: 0;
}

/* Payoff Analysis */
.payoff-analysis {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.payoff-item {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.payoff-item h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

/* Transformation Benefits */
.transformation-benefits {
    margin-bottom: var(--spacing-3xl);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.benefit-item {
    background: var(--color-bg-elevated);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    position: relative;
}

.benefit-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-success);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.benefit-item h4 {
    color: var(--color-success);
    margin-bottom: var(--spacing-md);
}

/* Risk Mitigation */
.risk-mitigation {
    margin-bottom: var(--spacing-3xl);
}

.risk-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.risk-item {
    background: var(--color-bg-elevated);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    position: relative;
}

.risk-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-warning);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.risk-item h4 {
    color: var(--color-warning);
    margin-bottom: var(--spacing-md);
}

/* Financial Projections Timeline */
.financial-projections {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.timeline-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
}

.timeline-marker {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.timeline-content {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    flex: 1;
}

.timeline-content h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.timeline-content strong {
    color: var(--color-success);
}

/* Conclusion */
.conclusion-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.conclusion-point {
    background: var(--color-bg-elevated);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.conclusion-point h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.blueprint-highlight {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.blueprint-highlight h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
}

.blueprint-highlight strong {
    color: var(--color-primary);
    font-size: var(--font-size-lg);
}

.final-cta {
    background: var(--color-bg-elevated);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}

.final-cta h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.cta-buttons {
    margin-top: var(--spacing-xl);
}

/* References */
.references-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.reference-item {
    background: var(--color-bg-elevated);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
}

.reference-item h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}

.reference-item p {
    color: var(--color-text-tertiary);
    margin-bottom: 0;
    font-size: var(--font-size-sm);
}

/* Footer */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-info h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-xl);
}

.footer-info p {
    color: var(--color-text-tertiary);
    margin-bottom: 0;
}

.footer-meta {
    text-align: right;
}

.footer-meta p {
    color: var(--color-text-quaternary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.footer-meta p:last-child {
    margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --spacing-3xl: 3rem;
        --spacing-2xl: 2rem;
    }
    
    .hero {
        min-height: 80vh;
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 280px;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .evidence-grid {
        grid-template-columns: 1fr;
    }
    
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .timeline-item {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-meta {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .content-section {
        padding: var(--spacing-2xl) 0;
    }
    
    .phase-header {
        flex-direction: column;
        text-align: center;
    }
    
    .activities-grid {
        grid-template-columns: 1fr;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
}

/* Animation & Interactions */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.03);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-6px);
    }
}

.content-block,
.evidence-item,
.phase-item,
.conclusion-point {
    animation: fadeInUp 0.3s ease-out;
}

.metric {
    animation: scaleIn 0.25s ease-out;
    animation-delay: 0.1s;
    animation-fill-mode: both;
}

.stat-item {
    animation: slideInRight 0.3s ease-out;
    animation-fill-mode: both;
}

.pain-item {
    animation: slideInLeft 0.3s ease-out;
    animation-fill-mode: both;
}

/* Hover animations */
.content-block:hover,
.evidence-item:hover,
.component-item:hover {
    animation: none;
    transform: translateY(-4px) scale(1.01);
    transition: all 0.2s ease-out;
}

.metric:hover {
    animation: pulse 0.6s ease-in-out infinite;
}

.phase-number {
    animation: float 2s ease-in-out infinite;
}

/* Fortune 500 Icons */
.section-icon {
    display: inline-block;
    width: 24px;
    height: 24px;
    margin-right: var(--spacing-sm);
    vertical-align: middle;
    opacity: 0.8;
}

.icon-strategy::before {
    content: "📊";
    font-size: 20px;
}

.icon-problem::before {
    content: "⚠️";
    font-size: 20px;
}

.icon-solution::before {
    content: "💡";
    font-size: 20px;
}

.icon-evidence::before {
    content: "📈";
    font-size: 20px;
}

.icon-implementation::before {
    content: "⚙️";
    font-size: 20px;
}

.icon-roi::before {
    content: "💰";
    font-size: 20px;
}

/* SVG Icons for Professional Look */
.svg-icon {
    width: 24px;
    height: 24px;
    display: inline-block;
    vertical-align: middle;
    margin-right: var(--spacing-sm);
}

.svg-icon svg {
    width: 100%;
    height: 100%;
    fill: var(--color-primary);
}

/* Professional Line Art Icons */
.line-art-icon {
    width: 32px;
    height: 32px;
    display: inline-block;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    margin-right: var(--spacing-md);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.line-art-icon:hover {
    opacity: 1;
}

/* Subtle Background Patterns */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(45deg, transparent 49%, rgba(0, 122, 255, 0.02) 50%, transparent 51%),
        linear-gradient(-45deg, transparent 49%, rgba(0, 122, 255, 0.02) 50%, transparent 51%);
    background-size: 60px 60px;
    pointer-events: none;
    opacity: 0.5;
}

/* Enhanced Section Dividers */
.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--color-border) 50%, transparent 100%);
    margin: var(--spacing-3xl) 0;
    position: relative;
}

.section-divider::before {
    content: '';
    position: absolute;
    left: 50%;
    top: -4px;
    transform: translateX(-50%);
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* Enhanced Tooltips */
.enhanced-tooltip {
    position: relative;
    cursor: help;
}

.enhanced-tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 1000;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.enhanced-tooltip::before {
    content: '';
    position: absolute;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--color-bg-secondary);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 1000;
}

.enhanced-tooltip:hover::after,
.enhanced-tooltip:hover::before {
    opacity: 1;
    visibility: visible;
}

/* Smooth scroll padding for fixed header */
html {
    scroll-padding-top: 100px;
}

/* Focus styles for accessibility */
:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Tables and Data Presentation */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

thead {
    background: var(--color-bg-tertiary);
}

th, td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

tr:hover {
    background: rgba(0, 122, 255, 0.05);
}

tr:last-child td {
    border-bottom: none;
}

/* Responsive Tables */
@media (max-width: 768px) {
    table {
        font-size: var(--font-size-xs);
    }
    
    th, td {
        padding: var(--spacing-sm);
    }
}

/* Data Cards (Alternative to tables on mobile) */
.data-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.data-card-header {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.data-card-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.data-field {
    display: flex;
    flex-direction: column;
}

.data-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.data-value {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

/* Enhanced Navigation Active State */
.nav-link.active {
    color: var(--color-primary);
    background: rgba(0, 122, 255, 0.15);
    border-radius: var(--radius-sm);
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Expandable Content Enhanced Styling */
.component-item.collapsed .component-header {
    border-bottom: none;
}

.expand-indicator {
    transition: all var(--transition-base);
}

/* Enhanced Focus States */
.nav-link:focus-visible,
.btn-primary:focus-visible,
.btn-secondary:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.2);
}

/* Skip Link Styling */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary);
    color: var(--color-text-primary);
    padding: 8px 16px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 1002;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: top var(--transition-base);
}

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

/* Print styles */
@media print {
    .main-nav,
    .hero-actions,
    .cta-buttons,
    .reading-progress {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .content-section {
        page-break-inside: avoid;
    }
    
    .component-item .component-content {
        max-height: none !important;
        padding: var(--spacing-xl) !important;
    }
    
    .phase-item,
    .evidence-item,
    .conclusion-point {
        page-break-inside: avoid;
        margin-bottom: var(--spacing-lg);
    }
}

/* Floating Navigation */
.floating-nav {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
}

.floating-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.floating-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.floating-btn span {
    width: 20px;
    height: 2px;
    background: white;
    border-radius: 1px;
    transition: all 0.15s ease-out;
}

.floating-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.floating-btn.active span:nth-child(2) {
    opacity: 0;
}

.floating-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.floating-menu {
    position: absolute;
    bottom: 70px;
    right: 0;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.15s ease-out;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
}

.floating-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.floating-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-xs);
}

.floating-link:last-child {
    margin-bottom: 0;
}

.floating-link:hover {
    background: var(--color-primary);
    color: var(--color-text-primary);
    transform: translateX(-3px);
}

@media (max-width: 768px) {
    .floating-nav {
        bottom: 20px;
        right: 20px;
    }
    
    .floating-btn {
        width: 50px;
        height: 50px;
    }
    
    .floating-menu {
        bottom: 60px;
        min-width: 120px;
    }
}