/* ===================================
   Base Styles & Typography
   =================================== */

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

:root {
    /* Color Palette */
    --bg-dark: #1a1a2e;
    --bg-light: #f8f9fa;
    --text-dark: #2c3e50;
    --text-light: #ffffff;
    --accent-blue: #3498db;
    --accent-yellow: #f39c12;
    --accent-green: #27ae60;
    --accent-red: #e74c3c;
    --overlay-bg: rgba(255, 255, 255, 0.95);
    --border-gray: #dfe6e9;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

body {
    font-family: var(--font-sans);
    font-size: 18px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* ===================================
   Scrollytelling Base Structure
   =================================== */

#scroll {
    position: relative;
}

.scroll-section {
    position: relative;
    min-height: 100vh;
}

/* Fixed graphic container */
.scroll-graphic {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

/* Scrolling text container */
.scroll-text {
    position: relative;
    z-index: 10;
    pointer-events: none;
}

.step {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg) var(--spacing-md);
    pointer-events: all;
}

/* ===================================
   Section 1: Force-Directed Graph
   =================================== */

#section1 {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    display: flex;
    flex-direction: row;
}

#section1 .scroll-graphic {
    flex: 0 0 60%; /* Graph takes 60% on left for better visibility */
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

#section1 .scroll-text {
    flex: 0 0 40%; /* Text takes 40% on right */
    position: relative;
    background: rgba(255, 255, 255, 0.95);
    padding: var(--spacing-lg);
}

#force-graph {
    width: 100%;
    height: 100%;
}

/* Node hover tooltip */
.node-tooltip {
    position: absolute;
    visibility: hidden;
    background-color: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    pointer-events: none;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    white-space: nowrap;
    transition: opacity 0.2s ease;
}

.narrative-overlay {
    background: transparent; /* No box, text is directly on white background */
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    max-width: 100%;
}

#section1 .narrative-overlay {
    padding: var(--spacing-md);
}

.intro-text {
    font-size: 1.25rem;
    line-height: 1.8;
}

.prompt-box {
    background: #f7f7f7;
    border-left: 4px solid var(--accent-blue);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

.prompt-box.simple {
    border-left-color: var(--accent-yellow);
}

.prompt-box.structured {
    border-left-color: var(--accent-blue);
}

.prompt-box h3 {
    font-family: var(--font-sans);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
    color: #666;
}

.explanation {
    font-size: 1rem;
    color: #555;
}

.highlight {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-blue);
}

/* ===================================
   Section 2: Examples
   =================================== */

.example-container {
    position: relative;
    min-height: 400vh; /* Taller to allow for more scrolling */
    display: flex;
    flex-direction: row;
}

.example-container .scroll-graphic {
    flex: 0 0 60%; /* Take up 60% of width for better visualization space */
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #2c3e50; /* Dark background for better contrast */
}

.example-container .scroll-text {
    flex: 0 0 40%; /* Take up 40% of width */
    position: relative;
    z-index: 10;
    background: #ffffff; /* White background for text */
}

.example-container .step {
    padding: var(--spacing-lg);
}

.example-container .narrative-overlay {
    background: white;
    padding: var(--spacing-md);
}

/* Only apply dark text to the RIGHT side (scroll-text), not the visualization area */
.example-container .scroll-text .explanation,
.example-container .scroll-text p {
    color: #2c3e50; /* Darker text for better contrast */
}

#section2 {
    background: var(--bg-light);
}

.generic-response {
    background: #fff;
    border: 1px solid var(--border-gray);
    padding: var(--spacing-md);
    border-radius: 8px;
    font-size: 0.95rem;
    line-height: 1.6;
    color: #666;
}

.before-after-container {
    display: flex;
    gap: var(--spacing-md);
}

.before-after-container > div {
    flex: 1;
}

/* Example visualizations */
#example1-viz,
#example2-viz,
#example3-viz {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Section 2 Recap */
.recap-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: #ffffff; /* Clean white background */
}

.recap-content {
    max-width: 900px;
    text-align: center;
    color: var(--text-dark);
    background: #f8f9fa;
    padding: var(--spacing-xl);
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.pattern-summary {
    margin: var(--spacing-lg) 0;
    font-size: 1.25rem;
}

.pattern-summary p {
    color: var(--text-dark);
    font-weight: 600;
}

.key-insights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.insight-card {
    background: #ffffff;
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 2px solid #3498db;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.insight-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: #3498db;
}

.insight-card p {
    color: var(--text-dark);
}

/* ===================================
   Section 3: Deep Research
   =================================== */

#section3 {
    background: #f8f9fa; /* Light neutral background */
    display: flex;
    flex-direction: row;
}

#section3 .scroll-graphic {
    flex: 0 0 60%; /* 60% width for visualization area */
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #2c3e50; /* Consistent with examples */
}

#section3 .scroll-text {
    flex: 0 0 40%; /* 40% width for text area */
    position: relative;
    background: #ffffff;
    padding: var(--spacing-lg);
}

#section3 .step {
    padding: var(--spacing-lg);
}

#section3 .narrative-overlay {
    background: white;
    padding: var(--spacing-md);
}

.workflow-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

.workflow-step {
    background: #3498db;
    color: #ffffff;
    padding: var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    min-width: 200px;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.workflow-step h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: #ffffff;
}

.workflow-arrow {
    font-size: 2rem;
    color: #3498db;
    font-weight: bold;
}

.techniques-used {
    background: #f7f7f7;
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-md) 0;
}

.techniques-used p {
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

.meta-question {
    font-size: 1.1rem;
    font-style: italic;
    color: #555;
    margin-top: var(--spacing-md);
}

.prompt-box.deep-research {
    border-left-color: var(--accent-green);
}

.toc-preview {
    background: #f7f7f7;
    padding: var(--spacing-md);
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.8;
}

.deep-insight {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-green);
    margin-top: var(--spacing-md);
}

.takeaways {
    display: grid;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.takeaway {
    background: #ffffff;
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 2px solid #27ae60;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.takeaway h4 {
    font-size: 1.25rem;
    color: #27ae60;
}

.takeaway p {
    color: var(--text-dark);
}

.closing-message {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-top: var(--spacing-lg);
}

/* ===================================
   Resources Section
   =================================== */

.resources-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--bg-dark);
    color: var(--text-light);
}

.resources-content {
    max-width: 800px;
}

.resources-content h2 {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.resource-category {
    margin-bottom: var(--spacing-lg);
}

.resource-category h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--accent-blue);
}

.resource-category ul {
    list-style: none;
    padding-left: 0;
}

.resource-category li {
    margin-bottom: var(--spacing-xs);
}

.resource-category a {
    color: var(--text-light);
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-block;
    padding: var(--spacing-xs) 0;
}

.resource-category a:hover {
    color: var(--accent-blue);
    transform: translateX(10px);
}

/* ===================================
   D3 Visualization Styles
   =================================== */

.node {
    cursor: pointer;
    transition: all 0.3s ease;
}

.node circle {
    stroke: #fff;
    stroke-width: 2px;
}

.link {
    stroke: #999;
    stroke-opacity: 0.3;
    stroke-width: 1px;
}

.cluster-label {
    font-size: 18px;
    font-weight: 700;
    fill: #2c3e50;
    text-anchor: middle;
    pointer-events: none;
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.8), 0 0 8px rgba(255, 255, 255, 0.6);
}

.cluster-label.active {
    font-size: 22px;
    fill: #2c3e50;
    text-shadow: 0 0 8px rgba(255, 255, 255, 1), 0 0 12px rgba(255, 255, 255, 0.8);
}

.cluster-highlight-box {
    fill: none;
    stroke: #3498db;
    stroke-width: 3;
    stroke-dasharray: 5, 5;
    opacity: 0;
}

.node.active circle {
    stroke-width: 3px;
}

.link.active {
    stroke-opacity: 0.8;
    stroke-width: 2px;
}

/* ===================================
   Mobile Responsiveness
   =================================== */

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .narrative-overlay {
        padding: var(--spacing-md);
        max-width: 90%;
    }

    .step {
        padding: var(--spacing-md);
    }

    .workflow-diagram {
        flex-direction: column;
    }

    .workflow-arrow {
        transform: rotate(90deg);
    }

    .key-insights {
        grid-template-columns: 1fr;
    }

    .before-after-container {
        flex-direction: column;
    }
}

/* ===================================
   Animation Classes
   =================================== */

.fade-in {
    animation: fadeIn 0.6s ease-in;
}

.fade-out {
    animation: fadeOut 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ===================================
   Utility Classes
   =================================== */

.hidden {
    opacity: 0;
    pointer-events: none;
}

.visible {
    opacity: 1;
    pointer-events: all;
}

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}