/* ================================
   PROMETHIUS Website Styles
   Clean, Minimal, Professional
   ================================ */

:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-subtle: #f5f5f5;
    
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --text-light: #cccccc;
    
    --border: #e5e5e5;
    --border-light: #f0f0f0;
    
    --accent: #D97757;
    --accent-light: #E8927C;
    --accent-dark: #C96644;
    --success: #059669;
    --warning: #d97706;
    --error: #dc2626;
    
    /* Spacing */
    --container-width: 1100px;
    --section-padding: 80px 0;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 64px;
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Shadows (minimal) */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
}

/* ================================
   Reset & Base
   ================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ================================
   Navigation
   ================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-sm) 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
}

.logo {
    height: 32px;
    width: auto;
    transition: opacity 0.3s ease;
}

.logo:hover {
    opacity: 0.8;
}

.brand-name {
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.025em;
}

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

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

/* ================================
   Buttons
   ================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.btn-primary:hover {
    background: var(--text-secondary);
    border-color: var(--text-secondary);
}

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

.btn-secondary:hover {
    background: var(--bg-subtle);
    border-color: var(--text-secondary);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1rem;
}

/* ================================
   Hero Section
   ================================ */

.hero {
    padding: 120px 0 var(--spacing-xl);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
    line-height: 1.7;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(217, 119, 87, 0.1);
    border: 1px solid var(--accent);
    border-radius: 2px;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 24px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.stat-card {
    text-align: center;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 2px;
    transition: border-color 0.3s ease;
}

.stat-card:hover {
    border-color: var(--accent);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ================================
   Metrics Context Banner
   ================================ */

.metrics-context-banner {
    background: var(--accent);
    border-top: 1px solid var(--accent-dark);
    border-bottom: 1px solid var(--accent-dark);
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-xl);
}

.metrics-context-banner .context-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.95);
}

.metrics-context-banner svg {
    flex-shrink: 0;
    color: rgba(255, 255, 255, 0.9);
}

.metrics-context-banner strong {
    color: #ffffff;
    font-weight: 600;
}

/* ================================
   Statistics Section
   ================================ */

.stats-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
}

.stats-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.stats-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

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

.stat-number {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
}

.stat-source {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 4px;
    font-style: italic;
}

/* ================================
   Features Section
   ================================ */

.features-section {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: var(--spacing-lg);
    transition: border-color 0.3s ease;
}

.feature-card:hover {
    border-color: var(--accent);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    letter-spacing: -0.01em;
    text-transform: uppercase;
    font-size: 0.95rem;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    padding-left: 0;
}

.feature-list li {
    padding: 6px 0;
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    position: relative;
}

.feature-list li:before {
    content: "•";
    color: var(--text-muted);
    position: absolute;
    left: 0;
    font-weight: 400;
    font-size: 1.2rem;
}

/* ================================
   Architecture Section
   ================================ */

.architecture-section {
    padding: var(--section-padding);
    background: var(--bg-primary);
}

.sankey-diagram {
    max-width: 1200px;
    margin: 0 auto var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.flow-svg {
    width: 100%;
    height: auto;
}

.flow-legend {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 3px;
}

.architecture-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.arch-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
}

.arch-stat svg {
    flex-shrink: 0;
    color: var(--accent);
}

.stat-text {
    font-weight: 500;
    color: var(--text-secondary);
}

/* ================================
   CTA Section
   ================================ */

.cta-section {
    padding: var(--section-padding);
    text-align: center;
    background: var(--bg-secondary);
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ================================
   Footer
   ================================ */

.footer {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
}

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

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-brand .logo {
    height: 28px;
    width: auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.3s;
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-tagline {
    margin-top: var(--spacing-xs);
    font-style: italic;
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-menu {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .stat-number {
        font-size: 3rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .stats-title {
        font-size: 2rem;
    }
    
    .cta-content h2 {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .metrics-context-banner .context-content {
        font-size: 0.8rem;
        flex-wrap: wrap;
        text-align: center;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
}