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

:root {
    /* Colors - Minimal Black & White */
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-300: #d4d4d4;
    --color-gray-400: #a3a3a3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Courier New', monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-black);
    background: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-black);
}

.nav-icon {
    width: 24px;
    height: 24px;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--color-gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-black);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-black);
    transition: width var(--transition-base);
}

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

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: var(--space-3xl) 0;
    background: var(--color-black);
    color: var(--color-white);
}

.hero-content {
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: var(--color-gray-300);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.5;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
    max-width: 900px;
    margin: 0 auto;
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    transition: all var(--transition-base);
}

.stat:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.stat-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.stat-content {
    text-align: left;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-gray-400);
    margin-top: 2px;
}

/* Sections */
.section {
    padding: var(--space-3xl) 0;
}

.section-dark {
    background: var(--color-gray-50);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-2xl);
}

/* Overview Grid */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.overview-card {
    padding: var(--space-xl);
    border: 2px solid var(--color-gray-200);
    border-radius: 8px;
    transition: all var(--transition-base);
}

.overview-card:hover {
    border-color: var(--color-black);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.card-icon {
    width: 40px;
    height: 40px;
    margin-bottom: var(--space-md);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.card-list {
    list-style: none;
}

.card-list li {
    padding: var(--space-xs) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-gray-700);
}

.card-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-black);
    font-weight: 700;
}

/* Phase Cards */
.phases-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.phase-card {
    background: var(--color-white);
    border: 2px solid var(--color-gray-200);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-base);
}

.phase-card:hover {
    border-color: var(--color-black);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

.phase-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: var(--color-black);
    color: var(--color-white);
}

.phase-number {
    font-size: 2rem;
    font-weight: 700;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-white);
    color: var(--color-black);
    border-radius: 8px;
    flex-shrink: 0;
}

.phase-info {
    flex: 1;
}

.phase-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.phase-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--color-gray-300);
}

.phase-duration {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
}

.phase-duration i {
    width: 16px;
    height: 16px;
}

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

/* Steps */
.step {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-gray-200);
}

.step:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.step-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.step-header i {
    width: 24px;
    height: 24px;
}

.step-header h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

.step-list {
    list-style: none;
    counter-reset: step-counter;
}

.step-list li {
    counter-increment: step-counter;
    padding: var(--space-sm) 0;
    padding-left: var(--space-xl);
    position: relative;
    color: var(--color-gray-700);
    line-height: 1.7;
}

.step-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: var(--space-sm);
    width: 24px;
    height: 24px;
    background: var(--color-black);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

.step-list ul {
    margin-top: var(--space-sm);
    margin-left: var(--space-lg);
    list-style: disc;
}

.step-list ul li::before {
    display: none;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-gray-800);
}

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

.note {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-gray-100);
    border-left: 3px solid var(--color-black);
    margin-top: var(--space-md);
    border-radius: 4px;
}

.note i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.note span {
    font-size: 0.875rem;
    color: var(--color-gray-700);
}

/* Batch Grid */
.batch-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.batch-item {
    padding: var(--space-md);
    background: var(--color-gray-100);
    border-radius: 6px;
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Timeline */
.timeline {
    max-width: 800px;
    margin: var(--space-2xl) auto 0;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-gray-200);
}

.timeline-item {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    position: relative;
}

.timeline-marker {
    width: 40px;
    height: 40px;
    background: var(--color-black);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.timeline-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.timeline-content p {
    color: var(--color-gray-600);
}

/* Cost Section */
.cost-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.cost-card {
    background: var(--color-white);
    border: 2px solid var(--color-gray-200);
    border-radius: 8px;
    overflow: hidden;
}

.cost-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-black);
    color: var(--color-white);
}

.cost-header i {
    width: 24px;
    height: 24px;
}

.cost-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.cost-items {
    padding: var(--space-lg);
}

.cost-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.cost-item:last-child {
    border-bottom: none;
}

.cost-value {
    font-weight: 700;
    font-size: 1.125rem;
}

.cost-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
    padding: var(--space-2xl);
    background: var(--color-white);
    border: 3px solid var(--color-black);
    border-radius: 12px;
}

.cost-total, .cost-per-user {
    text-align: center;
}

.cost-total span:first-child,
.cost-per-user span:first-child {
    display: block;
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.total-value, .user-value {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
}

.cost-comparison {
    margin-top: var(--space-2xl);
    padding: var(--space-2xl);
    background: var(--color-white);
    border-radius: 8px;
}

.cost-comparison h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    text-align: center;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.comparison-item {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-gray-100);
    border-radius: 8px;
}

.comparison-label {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-xs);
}

.comparison-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.benefits {
    padding: var(--space-lg);
    background: var(--color-gray-100);
    border-radius: 8px;
}

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

.benefits ul {
    list-style: none;
}

.benefits li {
    padding: var(--space-xs) 0;
    padding-left: var(--space-lg);
    position: relative;
}

.benefits li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-black);
    font-weight: 700;
}

/* Footer */
.footer {
    background: var(--color-black);
    color: var(--color-white);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

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

.footer-section p {
    color: var(--color-gray-400);
    line-height: 1.6;
}

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

.footer-section li {
    padding: var(--space-xs) 0;
    color: var(--color-gray-400);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-gray-800);
    color: var(--color-gray-500);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero {
        padding: var(--space-2xl) 0;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: var(--space-2xl) 0;
    }
    
    .overview-grid {
        grid-template-columns: 1fr;
    }
    
    .phase-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-marker {
        width: 20px;
        height: 20px;
    }
    
    .cost-grid {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    .nav, .footer {
        display: none;
    }
    
    .phase-card {
        page-break-inside: avoid;
    }
}