/* ========================================
   CSS Variables & Design System
   ======================================== */
:root {
    /* Colors */
    --bg-primary: #0a0f1a;
    --bg-secondary: #0f1629;
    --bg-tertiary: #141c33;
    --bg-card: #111827;
    --bg-card-hover: #1a2340;

    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --accent-dark: #0891b2;
    --accent-glow: rgba(6, 182, 212, 0.15);
    --accent-glow-strong: rgba(6, 182, 212, 0.25);

    --secondary: #3b82f6;
    --warning: #f59e0b;
    --green: #22c55e;
    --purple: #a78bfa;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border: rgba(6, 182, 212, 0.12);
    --border-hover: rgba(6, 182, 212, 0.3);

    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --section-padding: clamp(4rem, 8vw, 7rem);
    --container-max: 1200px;

    /* Borders & Shadows */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(6, 182, 212, 0.1);

    /* Transitions */
    --transition: 0.3s ease;
    --transition-slow: 0.6s ease;
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    display: block;
}

/* ========================================
   Utility
   ======================================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-light), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-alt {
    background: var(--bg-secondary);
}

.section-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 1rem;
    text-align: center;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    line-height: 1.2;
    text-align: center;
    margin-bottom: 1.25rem;
}

.section-description {
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    color: var(--text-secondary);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3.5rem;
    line-height: 1.8;
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@keyframes waterFlow {
    0% { stroke-dashoffset: 0; }
    100% { stroke-dashoffset: -20; }
}

@keyframes turbineSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 0.5;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

@keyframes waveMove {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.water-flow {
    animation: waterFlow 1.5s linear infinite;
}

.turbine-spin {
    transform-origin: 250px 180px;
    animation: turbineSpin 3s linear infinite;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: all var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 15, 26, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0.65rem 0;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.25rem, 4vw, 2.5rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-primary);
    transition: color var(--transition);
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-light);
    background: var(--accent-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 6rem 0 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(6, 182, 212, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 80%, rgba(59, 130, 246, 0.06) 0%, transparent 50%);
}

.water-animation {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    overflow: hidden;
    opacity: 0.15;
}

.water-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 100%;
    animation: waveMove 8s linear infinite;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

.hero-subtitle {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: clamp(1.05rem, 1.8vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: clamp(2rem, 5vw, 4rem);
    margin-bottom: 2.5rem;
}

.hero-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-stat-number {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1;
}

.hero-stat-suffix {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 700;
    color: var(--accent);
}

.hero-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
    font-weight: 500;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    color: white;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 50px;
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(6, 182, 212, 0.45);
}

.hero-visual {
    display: none;
}

/* ========================================
   Overview Section
   ======================================== */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.overview-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0);
    transition: transform var(--transition);
}

.overview-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.overview-card:hover::before {
    transform: scaleX(1);
}

.overview-icon {
    width: 52px;
    height: 52px;
    margin-bottom: 1.25rem;
}

.overview-icon svg {
    width: 100%;
    height: 100%;
}

.overview-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.overview-card-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Technology Section
   ======================================== */
.tech-cards {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 3.5rem;
}

.tech-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

.tech-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.tech-card:nth-child(even) {
    direction: rtl;
}

.tech-card:nth-child(even) > * {
    direction: ltr;
}

.tech-card-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: rgba(6, 182, 212, 0.03);
    border-right: 1px solid var(--border);
}

.tech-card:nth-child(even) .tech-card-visual {
    border-right: none;
    border-left: 1px solid var(--border);
}

.tech-card-visual svg {
    width: 100%;
    max-width: 300px;
}

.tech-card-content {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.tech-card-badge {
    display: inline-flex;
    align-self: flex-start;
    padding: 0.3rem 0.85rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-radius: 50px;
    background: var(--accent-glow);
    color: var(--accent);
    border: 1px solid rgba(6, 182, 212, 0.2);
    margin-bottom: 1rem;
}

.badge-green {
    background: rgba(34, 197, 94, 0.1);
    color: var(--green);
    border-color: rgba(34, 197, 94, 0.2);
}

.badge-purple {
    background: rgba(167, 139, 250, 0.1);
    color: var(--purple);
    border-color: rgba(167, 139, 250, 0.2);
}

.tech-card-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.tech-card-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.tech-card-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tech-card-features li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-left: 1.5rem;
    position: relative;
}

.tech-card-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    opacity: 0.7;
}

/* Component Grid (Turbine Explainer) */
.turbine-explainer {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.turbine-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
}

.component-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.component-card {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.component-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.component-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 0.75rem;
}

.component-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.component-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   Benefits Section
   ======================================== */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.benefit-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.benefit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0);
    transition: transform var(--transition);
}

.benefit-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.benefit-card:hover::before {
    transform: scaleX(1);
}

.benefit-icon {
    width: 44px;
    height: 44px;
    margin-bottom: 1.25rem;
}

.benefit-icon svg {
    width: 100%;
    height: 100%;
}

.benefit-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.65rem;
}

.benefit-text {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Featured Benefit */
.benefit-featured {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-tertiary));
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-lg);
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.benefit-featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--secondary));
}

.benefit-featured-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.benefit-featured-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 800px;
    margin-bottom: 2rem;
}

.benefit-featured-stats {
    display: flex;
    gap: 3rem;
}

.featured-stat {
    display: flex;
    flex-direction: column;
}

.featured-stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1;
}

.featured-stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    display: inline;
}

.featured-stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
}

/* ========================================
   Global Impact Section
   ======================================== */
.global-content {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 3rem;
    align-items: start;
}

.leaders-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.leader-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    transition: all var(--transition);
}

.leader-item:hover {
    border-color: var(--border-hover);
}

.leader-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.leader-rank {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    opacity: 0.6;
    min-width: 24px;
}

.leader-name {
    font-weight: 600;
    flex: 1;
}

.leader-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-light);
}

.leader-bar-container {
    height: 6px;
    background: rgba(6, 182, 212, 0.08);
    border-radius: 3px;
    overflow: hidden;
}

.leader-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-dark), var(--accent-light));
    border-radius: 3px;
    width: 0;
    transition: width 1.5s ease;
}

.leader-bar.animated {
    width: var(--bar-width);
}

/* Impact Stats */
.impact-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.impact-stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    text-align: center;
    transition: all var(--transition);
}

.impact-stat-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.impact-stat-value {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1;
    display: inline;
}

.impact-stat-suffix {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
}

.impact-stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
}

/* ========================================
   Economics Section
   ======================================== */
.economics-content {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.cost-comparison {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.cost-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.cost-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.cost-bars {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.cost-bar-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.cost-bar-label {
    min-width: 150px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: right;
}

.cost-bar-track {
    flex: 1;
    height: 32px;
    background: rgba(6, 182, 212, 0.05);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.cost-bar-fill {
    height: 100%;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 12px;
    width: 0;
    transition: width 1.5s ease;
}

.cost-bar-fill.animated {
    width: var(--bar-width);
}

.cost-bar-fill.hydro {
    background: linear-gradient(90deg, var(--accent-dark), var(--accent));
}

.cost-bar-fill.wind {
    background: linear-gradient(90deg, #059669, var(--green));
}

.cost-bar-fill.solar {
    background: linear-gradient(90deg, #d97706, var(--warning));
}

.cost-bar-fill.gas {
    background: linear-gradient(90deg, #6366f1, var(--purple));
}

.cost-bar-fill.nuclear {
    background: linear-gradient(90deg, #2563eb, var(--secondary));
}

.cost-bar-fill.coal {
    background: linear-gradient(90deg, #475569, #64748b);
}

.cost-bar-value {
    font-size: 0.8rem;
    font-weight: 700;
    color: white;
    white-space: nowrap;
}

.economics-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.econ-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: all var(--transition);
}

.econ-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.econ-icon {
    width: 36px;
    height: 36px;
    margin-bottom: 1rem;
}

.econ-icon svg {
    width: 100%;
    height: 100%;
}

.econ-card h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.econ-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Challenges Section
   ======================================== */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.challenge-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: all var(--transition);
}

.challenge-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.challenge-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.challenge-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.challenge-text {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.challenge-solution {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
    padding: 1rem 1.25rem;
    background: rgba(34, 197, 94, 0.05);
    border-left: 3px solid var(--green);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.solution-label {
    font-weight: 700;
    color: var(--green);
}

/* ========================================
   Future Section
   ======================================== */
.future-timeline {
    position: relative;
    padding-left: 3rem;
    margin-bottom: 3.5rem;
}

.future-timeline::before {
    content: '';
    position: absolute;
    left: 11px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent), var(--accent-dark), transparent);
}

.timeline-item {
    position: relative;
    padding-bottom: 2.5rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -3rem;
    top: 0.35rem;
    width: 24px;
    height: 24px;
    background: var(--bg-primary);
    border: 3px solid var(--accent);
    border-radius: 50%;
    z-index: 1;
    transition: all var(--transition);
}

.timeline-item:hover .timeline-marker {
    background: var(--accent);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.75rem 2rem;
    transition: all var(--transition);
}

.timeline-item:hover .timeline-content {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.timeline-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.65rem;
    color: var(--text-primary);
}

.timeline-content p {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Innovation Cards */
.innovation-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.innovation-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    transition: all var(--transition);
}

.innovation-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.innovation-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 1.25rem;
}

.innovation-icon svg {
    width: 100%;
    height: 100%;
}

.innovation-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.65rem;
}

.innovation-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    background: linear-gradient(180deg, var(--bg-primary), var(--bg-secondary));
}

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.25rem;
}

.cta-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.cta-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.cta-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.cta-link:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: var(--accent-glow);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 2.5rem 0;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .global-content {
        grid-template-columns: 1fr;
    }

    .impact-stats {
        grid-template-columns: repeat(4, 1fr);
    }

    .tech-card {
        grid-template-columns: 1fr;
    }

    .tech-card:nth-child(even) {
        direction: ltr;
    }

    .tech-card-visual {
        border-right: none !important;
        border-left: none !important;
        border-bottom: 1px solid var(--border);
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 15, 26, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 1rem;
        border-bottom: 1px solid var(--border);
        gap: 0.25rem;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.25rem;
    }

    .challenges-grid {
        grid-template-columns: 1fr;
    }

    .impact-stats {
        grid-template-columns: 1fr 1fr;
    }

    .cost-bar-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.35rem;
    }

    .cost-bar-label {
        text-align: left;
        min-width: unset;
    }

    .benefit-featured {
        padding: 2rem;
    }

    .benefit-featured-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .future-timeline {
        padding-left: 2.5rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .overview-grid {
        grid-template-columns: 1fr;
    }

    .component-grid {
        grid-template-columns: 1fr;
    }

    .cta-links {
        flex-direction: column;
        align-items: center;
    }

    .impact-stats {
        grid-template-columns: 1fr;
    }

    .economics-cards {
        grid-template-columns: 1fr;
    }

    .innovation-cards {
        grid-template-columns: 1fr;
    }
}