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

:root {
    /* Color Palette */
    --bg-primary: #0a0e1a;
    --bg-secondary: #1a1f2e;
    --bg-card: #242938;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-purple: #8b5cf6;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border: #374151;
    --gradient-primary: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    --gradient-secondary: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    
    /* Typography */
    --font-primary: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-logo {
    font-size: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: 8px;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.9rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 14, 26, 0.8), rgba(26, 31, 46, 0.6));
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: var(--spacing-lg);
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--accent-orange);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(36, 41, 56, 0.8);
    border-radius: 12px;
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-blue);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--accent-blue);
    border-bottom: 2px solid var(--accent-blue);
    transform: rotate(45deg);
}

/* Section Styles */
.section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Overview Section */
.overview-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.overview-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.overview-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue);
}

.overview-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

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

.stat-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-primary);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.2);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-blue);
    margin-bottom: var(--spacing-xs);
}

.stat-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Modeling Section */
.modeling-content {
    max-width: 1200px;
    margin: 0 auto;
}

.scenario-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
    background: var(--bg-card);
    padding: var(--spacing-xs);
    border-radius: 12px;
    overflow-x: auto;
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition-fast);
    white-space: nowrap;
    font-weight: 500;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--gradient-primary);
    color: white;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

.scenario-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border);
    margin-bottom: var(--spacing-xl);
}

.scenario-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue);
}

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

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

.kpi-item {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.kpi-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.kpi-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-green);
    font-family: var(--font-mono);
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.chart-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: 16px;
    border: 1px solid var(--border);
}

.chart-card h4 {
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue);
    text-align: center;
}

.chart-card canvas {
    max-height: 300px;
}

/* Intersection Performance */
.intersection-content {
    max-width: 1200px;
    margin: 0 auto;
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.performance-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border);
}

.performance-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--accent-blue);
    text-align: center;
}

.los-grid {
    display: grid;
    gap: var(--spacing-md);
}

.los-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.los-d {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
    border-color: var(--accent-red);
}

.los-c {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
    border-color: var(--accent-orange);
}

.los-grade {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
}

.los-d .los-grade {
    background: var(--accent-red);
    color: white;
}

.los-c .los-grade {
    background: var(--accent-orange);
    color: white;
}

.los-junctions {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.los-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.travel-time-comparison {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-md);
    align-items: center;
}

.segment {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.segment-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--accent-blue);
}

.segment-details {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.segment-time {
    font-size: 1.2rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-orange);
}

.vs {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

/* Mobility Loops */
.loops-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.loops-info {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border);
    height: fit-content;
}

.loop-legend {
    margin-bottom: var(--spacing-xl);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.legend-color.nature {
    background: var(--accent-green);
}

.legend-color.culture {
    background: var(--accent-purple);
}

.legend-color.water {
    background: var(--accent-blue);
}

.legend-color.active {
    background: var(--accent-orange);
}

.crossing-types h4 {
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue);
}

.crossing-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.crossing-icon {
    font-size: 1.2rem;
}

.map-container {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.mobility-map {
    height: 500px;
    width: 100%;
}

/* Recommendations */
.recommendations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.recommendation-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.recommendation-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
}

.recommendation-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.2);
}

.rec-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.recommendation-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue);
}

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

.rec-impact {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--gradient-secondary);
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: var(--spacing-2xl) 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 h4 {
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue);
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: var(--spacing-xs);
    transition: var(--transition-fast);
}

.footer-section a:hover {
    color: var(--accent-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .overview-grid {
        grid-template-columns: 1fr;
    }
    
    .loops-content {
        grid-template-columns: 1fr;
    }
    
    .loops-info {
        order: 2;
    }
    
    .charts-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scenario-tabs {
        flex-direction: column;
    }
    
    .performance-grid {
        grid-template-columns: 1fr;
    }
    
    .travel-time-comparison {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .vs {
        order: 2;
    }
    
    .recommendations-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .nav {
        padding: var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
}



/* Utility Classes */
.fade-in {
    animation: fadeInUp 0.6s ease forwards;
}

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

