/* CSS Reset & Variables */
:root {
    /* Light Theme (Default) */
    --bg-dark: #ffffff;
    --bg-darker: #f0f0f0;
    --bg-card: #ffffff;
    --text-primary: #333333;
    --text-secondary: #57606a;
    
    --accent-primary: #0066cc;
    --accent-primary-hover: #0056b3; 
    --accent-neon: #0066cc;
    --accent-cyan: #0066cc;
    --accent-purple: #0066cc;
    
    --border-color: #d0d7de;
    --nav-bg: rgba(255, 255, 255, 0.85);

    --font-main: 'Open Sans', sans-serif;
    --font-title: 'Montserrat', sans-serif;
    --font-code: 'JetBrains Mono', monospace;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
}

[data-theme="dark"] {
    --bg-dark: #0d1117;
    --bg-darker: #010409;
    --bg-card: #161b22;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    
    --accent-primary: #0066cc;
    --accent-primary-hover: #0056b3;
    --accent-neon: #0066cc;
    --accent-cyan: #0066cc;
    --accent-purple: #0066cc;
    
    --border-color: #30363d;
    --nav-bg: rgba(13, 17, 23, 0.85);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4 {
    font-family: var(--font-title);
    color: var(--text-primary);
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

.section-padding {
    padding: var(--spacing-lg) 0;
}

.bg-darker {
    background-color: var(--bg-darker);
}

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

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

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

.code-style {
    font-family: var(--font-code);
    background: rgba(110, 118, 129, 0.4);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    color: #ff7b72; /* Reddish code color */
    font-size: 0.9em;
    padding-bottom: 0.1em; /* Avoid cutting off at bottom */
    display: inline-block; /* Ensure proper box model behavior */
    line-height: 1.4;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.6rem;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-family: var(--font-main);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
    box-shadow: 0 0 15px rgba(0, 102, 204, 0.4);
}

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(0, 102, 204, 0.6);
}

.btn-large {
    font-size: 1.2rem;
    padding: 1rem 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
    font-family: var(--font-code);
}

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

.nav-item {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
    font-size: 0.95rem;
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Hero Section */
.hero-section {
    min-height: 90vh; /* Almost full viewport */
    display: flex;
    align-items: center;
    position: relative;
    background: radial-gradient(circle at top right, rgba(0, 102, 204, 0.1), transparent 40%);
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    align-items: center;
}

.hero-content {
    max-width: 650px; /* Increased from 600px */
}

.badge {
    background: rgba(0, 102, 204, 0.1);
    color: var(--accent-primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: var(--spacing-sm);
    border: 1px solid rgba(0, 102, 204, 0.4);
}

.hero-content h1 {
    font-size: 3rem; /* Slightly reduced from 3.5rem to prevent overflow */
    margin-bottom: var(--spacing-md); /* Increased spacing */
    letter-spacing: -0.5px;
    line-height: 1.4; /* Increased line-height specifically for hero */
}

.subheadline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6; /* Better readability */
}

/* Hero Illustration */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.pipeline-illustration {
    position: relative;
    width: 100%;
    max-width: 550px; /* Made larger */
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.node {
    width: 90px; /* Larger nodes */
    height: 90px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem; /* Larger icons */
    color: var(--text-secondary);
    position: relative; /* Changed from absolute */
    z-index: 2;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    flex-shrink: 0;
}

.node-raw { color: #ff7b72; }
.node-process { color: var(--accent-cyan); animation: pulse 3s infinite; }
.node-final { color: var(--accent-neon); }

.connector {
    flex-grow: 1; /* Adaptive width */
    height: 3px; /* Thicker line */
    background: var(--border-color);
    position: relative;
    margin: 0 10px;
    top: auto;
}

/* Particle Animation (Data Stream) */
.data-stream {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 3;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    top: 50%;
    margin-top: -4px;
    opacity: 0;
    filter: blur(2px);
    box-shadow: 0 0 10px var(--accent-cyan);
    animation: flow 2.5s infinite linear;
}

.particle:nth-child(1) { animation-delay: 0s; }
.particle:nth-child(2) { animation-delay: 0.8s; }
.particle:nth-child(3) { animation-delay: 1.6s; }

@keyframes flow {
    0% { left: 0; opacity: 0; }
    10% { opacity: 1; }
    45% { opacity: 1; } /* Pass first connector */
    55% { opacity: 0.5; } /* Inside middle node */
    65% { opacity: 1; } /* Pass second connector */
    90% { opacity: 1; }
    100% { left: 100%; opacity: 0; }
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 102, 204, 0.4); }
    70% { box-shadow: 0 0 0 25px rgba(0, 102, 204, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 102, 204, 0); }
}

/* Problem Section */
.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
}

.icon-box {
    font-size: 2rem;
    color: var(--accent-cyan);
    margin-bottom: var(--spacing-sm);
}

/* Methodology / Pillars */
.pillars-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.pillar-item {
    display: flex;
    align-items: flex-start;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border-left: 4px solid var(--border-color);
    transition: all 0.3s;
}

.pillar-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-left-color: var(--accent-neon);
}

.pillar-number {
    font-family: var(--font-code);
    font-size: 3rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.1);
    margin-right: var(--spacing-md);
    line-height: 1;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--border-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
}

.timeline-item.left { left: 0; }
.timeline-item.right { left: 50%; }

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--bg-dark);
    border: 3px solid var(--accent-cyan);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.right::after {
    left: -10px;
}

.timeline-date {
    display: block;
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: var(--font-code);
}

/* Routine */
.routine-steps {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    position: relative;
    margin-top: var(--spacing-md);
}

.step {
    text-align: center;
    flex: 1;
    min-width: 150px;
    position: relative;
    z-index: 2;
}

.step-icon {
    width: 70px;
    height: 70px;
    background: var(--bg-card);
    border: 2px solid var(--accent-purple);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto var(--spacing-sm);
    font-size: 1.5rem;
    color: var(--accent-purple);
    transition: 0.3s;
}

.step:hover .step-icon {
    background: var(--accent-purple);
    color: white;
    box-shadow: 0 0 20px rgba(0, 102, 204, 0.4);
}

.step-connector {
    flex-grow: 1;
    height: 2px;
    background: var(--border-color);
    margin-top: 35px; /* Half of step-icon height */
    position: relative;
    top: 0;
    display: none; /* Hidden on mobile default, shown on desktop via media query */
}

/* Technologies */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    text-align: center;
}

.tech-item {
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: 8px;
    transition: all 0.3s;
    filter: grayscale(100%);
    opacity: 0.7;
}

.tech-item:hover {
    filter: grayscale(0%);
    opacity: 1;
    transform: scale(1.05);
    background: rgba(255, 255, 255, 0.05);
}

.tech-item i {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    display: block;
}

/* Footer */
.footer-section {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    background: linear-gradient(to top, var(--bg-darker), var(--bg-dark));
    border-top: 1px solid var(--border-color);
}

.footer-links {
    margin: var(--spacing-md) 0;
    color: var(--text-secondary);
}

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

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

/* Mobile Responsiveness */
@media screen and (max-width: 768px) {
    .section-title { font-size: 2rem; }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content h1 { font-size: 2.5rem; }
    
    .hero-visual { 
        display: flex; 
        margin-top: var(--spacing-lg); 
    }
    .pipeline-illustration {
        max-width: 100%;
        transform: scale(0.8); /* Slightly smaller on very small screens if needed */
    }
    
    .timeline::after { left: 31px; }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }
    
    .timeline-item::after { left: 21px; }
    
    .timeline-item.left, .timeline-item.right { left: 0; }
    
    .routine-steps { flex-direction: column; gap: var(--spacing-md); }
    .step-connector { display: none; }
}

@media screen and (min-width: 769px) {
    .step-connector { display: block; }
}

/* Partnerships Section */
.section-subtitle {
    display: block;
    margin-top: -0.5rem; /* Pull closer to title */
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

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

.partner-card {
    width: 200px;
    height: 120px;
    background: rgba(255, 255, 255, 0.02);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all 0.3s;
    cursor: pointer;
}

.partner-card:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 102, 204, 0.05);
    transform: translateY(-5px);
}

.empty-partner span {
    font-weight: 600;
    color: var(--text-secondary);
}

.empty-partner small {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.6;
    margin-top: 4px;
}

.btn-secondary {
    display: inline-block;
    padding: 0.8rem 1.6rem;
    border-radius: 6px;
    font-weight: 600;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
    font-family: var(--font-main);
}

.btn-secondary:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(0, 102, 204, 0.2);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s;
    margin-left: 1rem;
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
    background: var(--bg-card);
}