:root {
    /* Color Palette */
    --primary-color: #0f172a; /* Deep Navy */
    --secondary-color: #334155; /* Slate */
    --accent-color: #ef4444; /* Tech Red/Orange - Vibrant */
    --highlight-color: #f59e0b; /* Amber */
    --text-light: #f8fafc;
    --text-dark: #1e293b;
    --bg-light: #ffffff;
    --bg-dark: #0f172a;
    --card-bg: rgba(255, 255, 255, 0.05); /* Glass effect */
    
    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-speed);
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
}

.primary-btn {
    background-color: var(--accent-color);
    color: var(--text-light);
    border: 2px solid var(--accent-color);
}

.primary-btn:hover {
    background-color: transparent;
    color: var(--accent-color);
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-light);
}

.logo .highlight {
    color: var(--accent-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-light);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.menu-toggle {
    display: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    background-image: url('assets/hero_bg.png'); /* Will be generated */
    background-size: cover;
    background-position: center;
    background-attachment: fixed; /* Parallax feel */
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-light);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0.9));
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    color: rgb(203, 213, 225);
    margin-bottom: 2rem;
}

.hero-text {
    font-size: 1.1rem;
    font-style: italic;
    opacity: 0.9;
    margin-bottom: 3rem;
    font-weight: 300;
}

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

.dark-bg {
    background-color: var(--bg-dark);
    color: var(--text-light);
}

.light-bg {
    background-color: var(--bg-light);
    color: var(--text-dark);
}

.tech-bg {
    background-color: #1e293b;
    color: var(--text-light);
    position: relative;
    overflow: hidden;
}

.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.highlight-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.feature-img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Problem Section */
.problem-list {
    margin: 2rem 0;
}

.problem-list li {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.problem-list li i {
    color: var(--accent-color);
}

.stat-box {
    background: rgba(255,255,255,0.1);
    padding: 1.5rem;
    border-left: 4px solid var(--accent-color);
    border-radius: 0 8px 8px 0;
}

/* Solution Section */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.card {
    background: #f1f5f9;
    padding: 1.5rem;
    text-align: center;
    border-radius: 8px;
    transition: transform var(--transition-speed);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.card h4 {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* Model Section */
.section-header {
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.tech-item {
    text-align: center;
    background: rgba(255,255,255,0.05);
    padding: 2rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.1);
}

.icon-circle {
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
}

.tech-showcase {
    text-align: center;
}

.tech-img {
    max-width: 600px;
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 0 40px rgba(239, 68, 68, 0.2); /* Glow effect */
}

/* Economics Section */
.investment-reasons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.reason-card {
    background: rgba(255,255,255,0.03);
    padding: 1.5rem;
    border-radius: 8px;
    border-top: 3px solid var(--accent-color);
}

.reason-card i {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.unit-economicsbox {
    background: var(--secondary-color);
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
}

.economics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.eco-item {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
}

.eco-item .value {
    font-size: 1.2rem;
    font-weight: 700;
    color: white;
}

.eco-item .label {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 0.5rem;
}

.eco-item.highlight .value {
    color: var(--highlight-color);
    font-size: 1.4rem;
}

.chart-img {
    max-width: 100%;
    margin-top: 2rem;
    border-radius: 8px;
}

/* Footer */
.footer {
    background: #020617; /* Very dark */
    color: var(--text-light);
    padding: 4rem 0;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-links {
    margin: 2rem 0;
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.footer-links a {
    color: #94a3b8;
    font-size: 0.9rem;
}

.copyright {
    color: #64748b;
    font-size: 0.8rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s forwards;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

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

.delay-1 { animation-delay: 0.2s; transition-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; transition-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; transition-delay: 0.6s; }

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .menu-toggle { display: block; }
    
    .hero h1 { font-size: 2.5rem; }
    
    .split-layout {
        grid-template-columns: 1fr;
    }
    
    .reverse .image-content { order: -1; } /* Image first on mobile */
    
    .tech-grid, .investment-reasons, .economics-grid {
        grid-template-columns: 1fr;
    }
    
    .section { padding: var(--spacing-lg) 0; }
}