/* SYSTEM VARIABLES & DESIGN TOKENS */
:root {
    --color-bg-light: #ffffff;
    --color-bg-gray: #f8f9fa;
    --color-bg-dark: #0f1411;
    
    /* Harmonious HSL colors */
    --color-primary-green: hsl(125, 40%, 19%); /* Xanh rêu đậm thương hiệu */
    --color-accent-green: hsl(125, 45%, 38%);  /* Xanh lá tươi Phần 1 */
    --color-accent-blue: hsl(210, 75%, 45%);   /* Xanh dương công nghệ Phần 3 */
    --color-warm-accent: hsl(30, 60%, 40%);    /* Màu vàng nắng đất ấm */
    
    --color-text-dark: #121614;
    --color-text-muted: #5a6560;
    --color-text-light: #f1f3f2;
    
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --max-width-read: 720px;
    --max-width-container: 1100px;
    --max-width-wide: 1300px;
    
    --transition-smooth: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-fast: all 0.2s ease;
}

/* GENERAL RESET */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-sans);
    color: var(--color-text-dark);
    background-color: var(--color-bg-light);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

body {
    overflow-x: hidden;
}

p {
    font-size: 1.125rem;
    font-weight: 400;
    color: var(--color-text-dark);
    margin-bottom: 2rem;
}

/* SCROLL PROGRESS BAR */
#scroll-progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: transparent;
    z-index: 1000;
}

#scroll-progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(to right, var(--color-accent-green), var(--color-accent-blue));
    transition: width 0.1s ease-out;
}

/* TYPOGRAPHY COMPONENTS */
.highlight-green {
    color: var(--color-accent-green);
    font-weight: 700;
}

.highlight-warm {
    color: var(--color-warm-accent);
    font-style: italic;
    font-family: var(--font-serif);
    font-weight: 600;
}

/* LAYOUT CONTAINER */
.container {
    width: 90%;
    max-width: var(--max-width-container);
    margin: 0 auto;
    padding: 6rem 0;
    position: relative;
    z-index: 2;
}

.container-narrow {
    width: 90%;
    max-width: var(--max-width-read);
    margin: 0 auto;
    padding: 6rem 0;
    position: relative;
    z-index: 2;
}

/* HERO SECTION (Fullscreen cinematic) */
.hero-section {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.05);
    transition: transform 10s ease-out;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(15,20,17,0.2) 0%, rgba(15,20,17,0.7) 100%);
    z-index: 2;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    color: var(--color-text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    letter-spacing: 0.2rem;
    opacity: 0.8;
}

.hero-scroll-indicator svg {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-8px); }
    60% { transform: translateY(-4px); }
}

/* HEADER STYLE (Tít chính & Sapo) */
.article-header {
    background-color: var(--color-bg-light);
    padding-top: 8rem;
    padding-bottom: 4rem;
}

.main-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5.5vw, 4.5rem);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-dark);
    margin-bottom: 4rem;
}

.sapo-block {
    position: relative;
    padding-left: 2.5rem;
    margin-top: 3rem;
}

.sapo-line {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--color-accent-green);
}

.sapo-icon {
    margin-bottom: 1.5rem;
    color: var(--color-accent-green);
}

.sapo-content {
    font-family: var(--font-sans);
}

.sapo-p {
    font-size: 1.25rem;
    line-height: 1.8;
    font-weight: 300;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.sapo-p:last-child {
    margin-bottom: 0;
}

/* SECTION STRUCTURE */
.article-section {
    position: relative;
    padding: 4rem 0 8rem;
    overflow: hidden;
}

.sec-part1 {
    background-color: var(--color-bg-light);
}

.sec-part2 {
    background-color: var(--color-bg-gray);
}

.sec-part3 {
    background-color: var(--color-bg-light);
}

/* ARTISTIC CHÌM NUMBER */
.artistic-number {
    position: absolute;
    z-index: 1;
    top: -2rem;
    left: -2rem;
    font-family: var(--font-serif);
    font-size: clamp(18rem, 30vw, 28rem);
    font-weight: 700;
    line-height: 1;
    color: var(--color-primary-green);
    opacity: 0.05;
    user-select: none;
    pointer-events: none;
}

.sec-part2 .artistic-number {
    color: var(--color-accent-blue);
    opacity: 0.04;
}

.sec-part3 .artistic-number {
    color: var(--color-accent-blue);
    opacity: 0.05;
}

.section-header {
    margin-bottom: 5rem;
    position: relative;
    z-index: 3;
}

.section-tag {
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.2rem;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    line-height: 1.3;
    font-weight: 600;
    max-width: 900px;
    color: var(--color-text-dark);
}

/* STICKY IMAGE LAYOUT (Bloomberg style) */
.sticky-layout {
    display: flex;
    gap: 4rem;
    align-items: flex-start;
    margin-bottom: 4rem;
}

.sticky-layout.reversed {
    flex-direction: row-reverse;
}

.sticky-text-side {
    flex: 1.2;
    min-width: 0;
}

.article-p {
    font-size: 1.125rem;
    line-height: 1.85;
    color: var(--color-text-dark);
    margin-bottom: 2rem;
}

.sticky-image-side {
    flex: 1;
    position: sticky;
    top: 5rem;
    z-index: 2;
}

.image-wrapper {
    width: 100%;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0,0,0,0.06);
    position: relative;
}

.sticky-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    transition: transform 1.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.image-wrapper:hover .sticky-img {
    transform: scale(1.03);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 60%, rgba(15,20,17,0.1) 100%);
    pointer-events: none;
}

.full-text-layout {
    max-width: var(--max-width-read);
    margin: 4rem 0 6rem;
}

/* FULLSCREEN IMAGE & TEXT ON IMAGE SECTIONS */
.fullscreen-image-section {
    position: relative;
    width: 100vw;
    height: 70vh;
    overflow: hidden;
    margin: 6rem 0;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    z-index: 2;
}

.parallax-image-bg {
    position: absolute;
    top: -30%;
    left: 0;
    width: 100%;
    height: 160%;
    background-size: cover;
    background-position: center;
    will-change: transform;
}

.fullscreen-text-image-section {
    position: relative;
    width: 100vw;
    height: 80vh;
    overflow: hidden;
    margin: 6rem 0;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.image-overlay-dark {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 20, 17, 0.65);
    z-index: 2;
}

.text-content-overlay {
    position: relative;
    z-index: 3;
    width: 90%;
    max-width: var(--max-width-read);
    text-align: center;
    padding: 2rem;
}

.highlight-text-white {
    color: #ffffff !important;
    font-size: clamp(1.2rem, 2.5vw, 1.5rem) !important;
    line-height: 1.85 !important;
    font-weight: 300 !important;
    text-shadow: 0 3px 15px rgba(0, 0, 0, 0.4);
    margin-bottom: 0 !important;
}

/* PARALLAX PANORAMA SPLIT */
.parallax-divider {
    position: relative;
    height: 60vh;
    width: 100vw;
    overflow: hidden;
}

.parallax-bg {
    position: absolute;
    top: -50%;
    left: 0;
    width: 100%;
    height: 200%;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    transform: translateY(0);
    will-change: transform;
}

.parallax-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15,20,17,0.15);
}

/* DIGITAL TRANSITION (Part 2 -> 3) */
.digital-transition {
    position: relative;
    height: 50vh;
    width: 100vw;
    background-color: var(--color-bg-dark);
    overflow: hidden;
}

.digital-transition canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.transition-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(248,249,250,1) 0%, rgba(15,20,17,0) 20%, rgba(15,20,17,0) 80%, rgba(255,255,255,1) 100%);
    pointer-events: none;
}

/* INFOGRAPHICS MAIN BOX */
.infographic-container {
    background-color: var(--color-bg-light);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 8px;
    padding: 3rem;
    margin: 6rem 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.02);
}

.sec-part2 .infographic-container {
    background-color: #ffffff;
}

.info-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: 3.5rem;
    text-align: center;
    position: relative;
}

.info-title::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background-color: var(--color-accent-green);
}

.sec-part2 .info-title::after {
    background-color: var(--color-accent-blue);
}

.sec-part3 .info-title::after {
    background-color: var(--color-accent-blue);
}

/* --- INFOGRAPHIC 1.1: Horizontal Timeline --- */
.timeline-wrapper {
    position: relative;
    width: 100%;
    overflow-x: auto;
    padding: 2rem 0;
    -webkit-overflow-scrolling: touch;
}

/* Swipe indicator on mobile */
.timeline-scroll-indicator {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.timeline-horizontal {
    position: relative;
    width: 1200px; /* Force layout width to scroll on small devices */
    margin: 0 auto;
    padding: 4rem 1rem;
}

.timeline-line-bg {
    position: absolute;
    top: 50%;
    left: 40px;
    right: 40px;
    height: 2px;
    background-color: #e0e6e3;
    transform: translateY(-50%);
    z-index: 1;
}

.timeline-line-active {
    position: absolute;
    top: 50%;
    left: 40px;
    width: 0%; /* Animated via JS */
    height: 2px;
    background-color: var(--color-accent-green);
    transform: translateY(-50%);
    z-index: 2;
    transition: width 1.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.timeline-nodes {
    display: flex;
    justify-content: space-between;
    position: relative;
    z-index: 3;
}

.timeline-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 120px;
    cursor: pointer;
}

.node-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #ffffff;
    border: 2px solid #e0e6e3;
    margin-bottom: 2rem;
    transition: var(--transition-fast);
}

.timeline-node.active .node-dot {
    border-color: var(--color-accent-green);
    background-color: var(--color-accent-green);
    transform: scale(1.3);
}

.node-icon {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background-color: var(--color-bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    border: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition-smooth);
}

.node-icon svg {
    width: 24px;
    height: 24px;
}

.timeline-node.active .node-icon {
    background-color: var(--color-accent-green);
    color: #ffffff;
    box-shadow: 0 10px 20px rgba(46, 125, 50, 0.2);
    transform: translateY(-5px);
}

.node-label {
    font-size: 0.85rem;
    font-weight: 500;
    text-align: center;
    color: var(--color-text-muted);
    line-height: 1.4;
    transition: var(--transition-fast);
}

.timeline-node.active .node-label {
    color: var(--color-text-dark);
    font-weight: 600;
}

/* --- INFOGRAPHIC 1.2: Network Graph --- */
.network-graph-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: center;
}

.network-svg-wrapper {
    position: relative;
    width: 100%;
    height: 450px;
    border: 1px solid rgba(0,0,0,0.03);
    border-radius: 6px;
    background-color: #fafbfc;
    overflow: hidden;
}

.network-svg {
    width: 100%;
    height: 100%;
}

.net-link {
    stroke: #e2e8f0;
    stroke-width: 1.5px;
    stroke-dasharray: 6 4;
    transition: var(--transition-smooth);
}

.net-link.active {
    stroke: var(--color-accent-green);
    stroke-width: 3px;
    stroke-dasharray: none;
    animation: dash-flow 30s linear infinite;
}

.net-node {
    cursor: pointer;
}

.net-node .node-bg {
    fill: #ffffff;
    stroke: #cbd5e1;
    stroke-width: 2px;
    transition: var(--transition-smooth);
}

.net-node.outer-node:hover .node-bg,
.net-node.outer-node.active .node-bg {
    stroke: var(--color-accent-green);
    fill: hsl(125, 45%, 96%);
    filter: drop-shadow(0px 4px 10px rgba(46, 125, 50, 0.15));
}

.net-node.center-node .node-bg {
    fill: var(--color-primary-green);
    stroke: var(--color-primary-green);
    filter: drop-shadow(0px 10px 20px rgba(30, 70, 32, 0.25));
}

.net-node.center-node:hover .node-bg {
    transform: scale(1.05);
}

.net-node .node-text {
    font-size: 11px;
    font-weight: 600;
    text-anchor: middle;
    fill: var(--color-text-dark);
    font-family: var(--font-sans);
    pointer-events: none;
}

.net-node.center-node .node-text {
    fill: #ffffff;
    font-size: 15px;
    font-weight: 700;
}

.network-info-box {
    display: flex;
    flex-direction: column;
    min-height: 200px;
}

.info-card {
    display: none;
    padding: 2rem;
    border-radius: 6px;
    background-color: var(--color-bg-gray);
    border-left: 4px solid var(--color-accent-green);
    animation: fadeIn 0.4s ease;
}

.info-card.active {
    display: block;
}

.info-card h4 {
    font-family: var(--font-sans);
    font-size: 1.2rem;
    color: var(--color-text-dark);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.info-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 0;
}

/* --- INFOGRAPHIC 2.1: Vertical Flow --- */
.vertical-flow-wrapper {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem 0;
}

.vertical-flow-path {
    position: absolute;
    left: 27px;
    top: 2rem;
    bottom: 2rem;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent-green), var(--color-accent-blue));
    z-index: 1;
}

.flow-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    position: relative;
    z-index: 2;
    margin-bottom: 2.5rem;
    opacity: 0.8;
    transition: var(--transition-smooth);
}

.flow-card:last-child {
    margin-bottom: 0;
}

.flow-card:hover, .flow-card.active {
    opacity: 1;
    transform: translateX(10px);
}

.flow-step-num {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-muted);
    width: 20px;
}

.flow-icon {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background-color: #ffffff;
    border: 2px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    transition: var(--transition-smooth);
    box-shadow: 0 4px 10px rgba(0,0,0,0.02);
}

.flow-icon svg {
    width: 22px;
    height: 22px;
}

.flow-card:hover .flow-icon,
.flow-card.active .flow-icon {
    border-color: var(--color-accent-blue);
    background-color: var(--color-accent-blue);
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(21, 101, 192, 0.25);
}

.flow-body {
    background-color: var(--color-bg-gray);
    padding: 1.25rem 2rem;
    border-radius: 6px;
    flex: 1;
    border: 1px solid rgba(0,0,0,0.02);
    transition: var(--transition-smooth);
}

.flow-body h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

.flow-card:hover .flow-body,
.flow-card.active .flow-body {
    background-color: #ffffff;
    border-color: rgba(21, 101, 192, 0.1);
    box-shadow: 0 8px 25px rgba(0,0,0,0.04);
}

/* --- INFOGRAPHIC 2.2: Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.stat-box {
    background-color: var(--color-bg-gray);
    border-radius: 8px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid rgba(0,0,0,0.02);
    transition: var(--transition-smooth);
}

.stat-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.04);
    background-color: #ffffff;
}

.stat-icon-circle {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.stat-icon-circle.accent-green {
    background-color: hsl(125, 45%, 93%);
    color: var(--color-accent-green);
}

.stat-icon-circle.accent-blue {
    background-color: hsl(210, 75%, 93%);
    color: var(--color-accent-blue);
}

.stat-number {
    font-family: var(--font-serif);
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.stat-visual {
    width: 100%;
    display: flex;
    justify-content: center;
}

/* Bar style */
.bar-container {
    width: 80%;
    height: 6px;
    background-color: #e2e8f0;
    border-radius: 3px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background-color: var(--color-accent-green);
    border-radius: 3px;
    width: 0; /* Animated */
    transition: width 1.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Pictogram style */
.pictogram-row {
    font-size: 1.1rem;
    letter-spacing: 2px;
    color: var(--color-text-muted);
}

.pictogram-item.filled {
    opacity: 0.9;
}

/* Progress ring style */
.circular-chart {
    max-width: 60px;
}

.circle-bg {
    fill: none;
    stroke: #e2e8f0;
    stroke-width: 2.8;
}

.circle-progress {
    fill: none;
    stroke: var(--color-accent-green);
    stroke-width: 2.8;
    stroke-linecap: round;
    transition: stroke-dasharray 1.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Text Stars */
.text-stars {
    font-size: 1.25rem;
    letter-spacing: 4px;
}

/* --- INFOGRAPHIC 3.1: Smart Process Loop --- */
.smart-loop-wrapper {
    width: 100%;
    padding: 1rem 0;
}

.loop-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 1rem;
    align-items: center;
}

.loop-step {
    background-color: var(--color-bg-gray);
    padding: 1.5rem 1rem;
    border-radius: 6px;
    text-align: center;
    border: 1px solid rgba(0,0,0,0.02);
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    transition: var(--transition-smooth);
}

.loop-step-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.loop-step h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: 0.5rem;
}

.loop-step p {
    font-size: 0.75rem;
    line-height: 1.4;
    color: var(--color-text-muted);
    margin-bottom: 0;
}

.loop-arrow {
    text-align: center;
    font-weight: bold;
    color: var(--color-accent-blue);
    font-size: 1.2rem;
    opacity: 0.5;
}

.loop-step[data-step="1"], .loop-step[data-step="2"], .loop-step[data-step="3"], .loop-step[data-step="4"] {
    grid-row: 1;
}

.loop-step[data-step="5"], .loop-step[data-step="6"], .loop-step[data-step="7"], .loop-step[data-step="8"] {
    grid-row: 2;
}

/* Positioning specific elements to form loop path */
/* Row 1 steps in columns 1, 3, 5, 7 */
.loop-step[data-step="1"] { grid-column: 1; }
.loop-step[data-step="2"] { grid-column: 3; }
.loop-step[data-step="3"] { grid-column: 5; }
.loop-step[data-step="4"] { grid-column: 7; }

/* Row 2 steps in columns 7, 5, 3, 1 (reversing) */
.loop-step[data-step="8"] { grid-column: 1; grid-row: 2; }
.loop-step[data-step="7"] { grid-column: 3; grid-row: 2; }
.loop-step[data-step="6"] { grid-column: 5; grid-row: 2; }
.loop-step[data-step="5"] { grid-column: 7; grid-row: 2; }

/* Arrows configuration */
.loop-arrow:nth-child(2)  { grid-column: 2; grid-row: 1; }
.loop-arrow:nth-child(4)  { grid-column: 4; grid-row: 1; }
.loop-arrow:nth-child(6)  { grid-column: 6; grid-row: 1; }

.loop-arrow:nth-child(10) { grid-column: 2; grid-row: 2; }
.loop-arrow:nth-child(12) { grid-column: 4; grid-row: 2; }
.loop-arrow:nth-child(14) { grid-column: 6; grid-row: 2; }

.loop-step:hover {
    background-color: #ffffff;
    border-color: rgba(13, 71, 161, 0.15);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.03);
}

.loop-step:hover .loop-step-badge {
    color: var(--color-accent-blue);
}

/* --- INFOGRAPHIC 3.2: Comparison layout --- */
.comparison-layout {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}

.comp-column {
    background-color: var(--color-bg-gray);
    border-radius: 8px;
    padding: 3rem 2.5rem;
    border: 1px solid rgba(0,0,0,0.02);
    transition: var(--transition-smooth);
}

.comp-column.advantages {
    border-top: 4px solid var(--color-accent-green);
}

.comp-column.challenges {
    border-top: 4px solid var(--color-accent-blue);
}

.comp-column:hover {
    background-color: #ffffff;
    box-shadow: 0 12px 30px rgba(0,0,0,0.04);
}

.comp-col-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.comp-col-header h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

.advantages .comp-col-header {
    color: var(--color-accent-green);
}

.challenges .comp-col-header {
    color: var(--color-accent-blue);
}

.comp-list {
    list-style: none;
}

.comp-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
    color: var(--color-text-dark);
}

.comp-list li:last-child {
    margin-bottom: 0;
}

.bullet-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-top: 0.6rem;
    flex-shrink: 0;
}

.advantages .bullet-dot {
    background-color: var(--color-accent-green);
}

.challenges .bullet-dot {
    background-color: var(--color-accent-blue);
}

/* FOOTER SECTION (Fullscreen ending) */
.footer-section {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    color: var(--color-text-light);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.footer-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.footer-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.footer-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(15,20,17,0.85) 0%, rgba(15,20,17,0.95) 100%);
    z-index: 2;
}

.footer-container {
    position: relative;
    z-index: 3;
    width: 90%;
    max-width: var(--max-width-read);
    text-align: center;
    margin: 0 auto;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 3rem;
}

.footer-content {
    margin-top: auto;
}

.conclusion-text {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.2vw, 1.85rem);
    line-height: 1.6;
    font-weight: 400;
    color: #e0e8e4;
    margin-bottom: 2rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.author-name {
    font-size: 0.95rem;
    letter-spacing: 0.15rem;
    text-transform: uppercase;
    color: var(--color-text-muted);
    font-weight: 600;
}

/* Tech connection line & data canvas wrapper */
.tech-connection-effect {
    position: absolute;
    bottom: 5rem;
    left: 0;
    width: 100%;
    height: 200px;
    pointer-events: none;
    z-index: 2;
}

.tech-connection-effect canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.footer-keyword-banner {
    margin-top: auto;
    margin-bottom: 3rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 1rem 1.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    color: var(--color-text-muted);
}

.dot-sep {
    width: 4px;
    height: 4px;
    background-color: var(--color-accent-green);
    border-radius: 50%;
    opacity: 0.7;
}

/* REVEAL ON SCROLL EFFECTS */
.reveal-item {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.reveal-item.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ANIMATIONS */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes dash-flow {
    to {
        stroke-dashoffset: -1000;
    }
}

/* RESPONSIVE DESIGN (TABLET & MOBILE) */
@media (max-width: 1024px) {
    .sticky-layout, .sticky-layout.reversed {
        flex-direction: column;
        gap: 2.5rem;
    }
    
    .sticky-image-side {
        position: static;
        width: 100%;
    }
    
    .network-graph-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .network-svg-wrapper {
        height: 400px;
    }
    
    .loop-grid {
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: repeat(4, 1fr);
        gap: 0.75rem;
    }
    
    /* Reposition steps in a simple snake line or linear block for smaller viewports */
    .loop-step[data-step="1"] { grid-column: 1; grid-row: 1; }
    .loop-step[data-step="2"] { grid-column: 3; grid-row: 1; }
    .loop-step[data-step="3"] { grid-column: 3; grid-row: 2; }
    .loop-step[data-step="4"] { grid-column: 1; grid-row: 2; }
    .loop-step[data-step="5"] { grid-column: 1; grid-row: 3; }
    .loop-step[data-step="6"] { grid-column: 3; grid-row: 3; }
    .loop-step[data-step="7"] { grid-column: 3; grid-row: 4; }
    .loop-step[data-step="8"] { grid-column: 1; grid-row: 4; }
    
    /* Arrows setup for mobile layout grid */
    .loop-arrow:nth-child(2)  { grid-column: 2; grid-row: 1; }
    .loop-arrow:nth-child(4)  { grid-column: 3; grid-row: 1.5; transform: rotate(90deg); }
    .loop-arrow:nth-child(6)  { grid-column: 2; grid-row: 2; transform: rotate(180deg); }
    .loop-arrow:nth-child(10) { grid-column: 1; grid-row: 2.5; transform: rotate(90deg); }
    .loop-arrow:nth-child(12) { grid-column: 2; grid-row: 3; }
    .loop-arrow:nth-child(14) { grid-column: 3; grid-row: 3.5; transform: rotate(90deg); }
}

@media (max-width: 768px) {
    .container, .container-narrow {
        padding: 4rem 0;
    }
    
    .timeline-scroll-indicator {
        display: flex;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .comparison-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .infographic-container {
        padding: 1.5rem;
        margin: 4rem 0;
    }
    
    .footer-keyword-banner {
        gap: 0.5rem 1rem;
    }
}