:root {
    --color-primary: #0B2B26;
    /* Deep Forest Green */
    --color-primary-dark: #051a16;
    --color-accent: #4ADE80;
    /* Light Green / Lime */
    --color-accent-hover: #3bce70;
    --color-white: #ffffff;
    --color-light-bg: #f8fafc;
    --color-text-dark: #1e293b;
    --color-text-light: #f1f5f9;
    --color-border: #e2e8f0;

    --font-main: 'Manrope', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Reset & Global */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 700;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s ease;
}

ul {
    list-style: none;
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-white);
    color: var(--color-white);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-accent {
    background-color: var(--color-accent);
    color: var(--color-primary);
    width: 100%;
}

.btn.sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

/* Header */
.header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
}

.nav-list a {
    color: var(--color-text-dark);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-list a:hover {
    color: var(--color-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.lang-switch {
    display: flex;
    gap: 12px;
    align-items: center;
}

.lang-btn {
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s, transform 0.3s;
    font-size: 1.25rem;
    line-height: 1;
    border-radius: 2px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.lang-btn:hover {
    opacity: 1;
    transform: translateY(-2px);
}

.lang-btn.active {
    opacity: 1;
    box-shadow: 0 0 0 2px var(--color-accent);
    transform: scale(1.1);
}

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-primary);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: var(--color-white);
    z-index: 1001;
    padding: var(--spacing-md);
    transition: 0.4s ease;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-close {
    text-align: right;
    font-size: 1.5rem;
    cursor: pointer;
    margin-bottom: var(--spacing-lg);
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mobile-nav-list a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0B2B26 0%, #134e44 100%);
    color: var(--color-white);
    padding-top: 80px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(11, 43, 38, 0.7);
    /* Darken if image is used */
    pointer-events: none;
    z-index: 1;
    display: none;
    /* Only enable if we have a bg image */
}

.hero-container {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
    background: linear-gradient(to right, #fff 0%, #a7f3d0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #e2e8f0;
    margin-bottom: var(--spacing-md);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.hero-partners {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    opacity: 0.9;
}

.sdg-text {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #94a3b8;
}

.sdg-icons {
    display: flex;
    gap: var(--spacing-md);
}

.sdg-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.2rem;
}

.sdg-icon span {
    font-size: 0.75rem;
    margin-top: 4px;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.section-desc {
    font-size: 1.125rem;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
}

/* Challenge Section */
.challenge {
    background-color: var(--color-light-bg);
}

.challenge-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    grid-template-areas:
        "main main chart chart"
        "item1 item2 item3 .";
    /* Simplified layout for stability first, adjusting below */
}

/* Re-doing grid for better layout as per content */
.challenge-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-md);
    align-items: center;
}

.challenge-main {
    grid-column: span 6;
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.huge-stat {
    font-size: 4rem;
    font-weight: 800;
    color: #ef4444;
    /* Alert color */
    line-height: 1;
}

.huge-stat .label {
    display: block;
    font-size: 1rem;
    color: var(--color-text-dark);
    font-weight: 500;
    margin-top: var(--spacing-xs);
}

.challenge-chart {
    grid-column: span 6;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    min-height: 200px;
}

.circular-chart {
    display: block;
    margin: 0 auto;
    max-width: 80%;
    max-height: 250px;
}

.circle-bg {
    fill: none;
    stroke: #eee;
    stroke-width: 3.8;
}

.circle {
    fill: none;
    stroke-width: 2.8;
    stroke-linecap: round;
    animation: progress 1s ease-out forwards;
}

@keyframes progress {
    0% {
        stroke-dasharray: 0 100;
    }
}

.circular-chart.red .circle {
    stroke: #ef4444;
}

.percentage {
    fill: #666;
    font-family: sans-serif;
    font-weight: bold;
    font-size: 0.5em;
    /* 0.5em relative to viewbox */
    text-anchor: middle;
}

.challenge-chart p {
    margin-top: var(--spacing-sm);
    font-weight: 600;
    color: #ef4444;
}

.challenge-item {
    grid-column: span 4;
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: transform 0.3s ease;
}

.challenge-item:hover {
    transform: translateY(-5px);
}

.challenge-item i {
    font-size: 2rem;
    color: #ef4444;
    margin-bottom: var(--spacing-sm);
}

/* Solution Section */
.solution {
    background-color: var(--color-white);
}

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

.solution-card {
    background: var(--color-light-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.solution-card:hover {
    border-color: var(--color-accent);
    background: #f0fdf4;
    transform: translateY(-5px);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--color-primary);
    color: var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.solution-card h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
}

.solution-card p {
    color: #64748b;
    font-size: 0.95rem;
}

/* How It Works */
.how-it-works {
    overflow-x: auto;
}

.steps-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    /* Wrap on small screens */
    gap: var(--spacing-sm);
}

.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 150px;
}

.step-icon {
    width: 80px;
    height: 80px;
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-md);
    transition: 0.3s;
}

.step-item:hover .step-icon {
    background: var(--color-primary);
    color: var(--color-white);
}

.step-text {
    font-weight: 600;
    color: var(--color-text-dark);
}

.step-arrow {
    color: var(--color-accent);
    font-size: 1.5rem;
}

/* Impact Section */
.impact {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.impact .section-title {
    color: var(--color-white);
}

.impact .section-desc {
    color: #94a3b8;
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.impact-item h3 {
    font-size: 3.5rem;
    color: var(--color-accent);
    display: inline-block;
}

.impact-item span {
    font-size: 2rem;
    color: var(--color-accent);
}

.impact-item p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Roadmap */
.roadmap {
    background: var(--color-light-bg);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-md) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background-color: var(--color-primary);
    opacity: 0.2;
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: 50px;
    position: relative;
    margin-bottom: var(--spacing-md);
    width: 50%;
}

.timeline-item:nth-child(even) {
    align-self: flex-end;
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 50px;
    left: 50%;
}

.timeline-dot {
    position: absolute;
    right: -8px;
    top: 0;
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border-radius: 50%;
    border: 3px solid var(--color-white);
    box-shadow: var(--shadow-sm);
}

.timeline-item:nth-child(even) .timeline-dot {
    right: auto;
    left: -8px;
}

.timeline-content {
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.timeline-content h3 {
    color: var(--color-primary);
    margin-bottom: 4px;
}

/* Team */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.team-card {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.team-card h3 {
    font-size: 1.1rem;
    color: var(--color-primary);
}

/* Footer */
.footer {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
}

.footer-cta h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-accent);
}

.footer-cta p {
    margin-bottom: var(--spacing-md);
    color: #cbd5e1;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.contact-form input,
.contact-form textarea {
    padding: 12px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-family: inherit;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.footer-info h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.footer-info p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: var(--spacing-sm);
    color: #cbd5e1;
}

.copyright {
    margin-top: var(--spacing-xl);
    font-size: 0.8rem;
    opacity: 0.5;
}

/* Responsive */
@media (max-width: 900px) {
    .challenge-grid {
        grid-template-columns: 1fr;
    }

    .challenge-main,
    .challenge-chart,
    .challenge-item {
        grid-column: span 1;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
        justify-content: flex-start;
    }

    .timeline-item:nth-child(even) {
        left: 0;
    }

    .timeline-dot,
    .timeline-item:nth-child(even) .timeline-dot {
        left: 12px;
    }

    .footer-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .mobile-toggle {
        display: block;
    }

    .header-actions .btn {
        display: none;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

    .steps-container {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
        margin: 10px 0;
    }

    .hero-btns {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        max-width: 300px;
        margin: 0 auto 30px;
    }
}

/* Bar Chart */
.impact-chart-container {
    margin-top: var(--spacing-lg);
    display: flex;
    justify-content: center;
}

.bar-chart {
    width: 100%;
    max-width: 400px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    position: relative;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.bar-group {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
    height: 80%;
    width: 100%;
    justify-content: center;
    position: relative;
}

.bar {
    width: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    position: relative;
    transition: height 1s ease-out;
}

.bar.before {
    background: #ef4444;
    /* Red for high cost */
}

.bar.after {
    background: var(--color-accent);
    /* Green for low cost */
}

.bar span {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-white);
    font-size: 0.9rem;
    font-weight: 600;
}

.bar-label {
    position: absolute;
    bottom: -40px;
    width: 100%;
    text-align: center;
    color: var(--color-accent);
    font-weight: 600;
}

/* Animations & Dynamic Effects */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.delay-100 {
    transition-delay: 0.1s;
}

.delay-150 {
    transition-delay: 0.15s;
}

.delay-200 {
    transition-delay: 0.2s;
}

.delay-250 {
    transition-delay: 0.25s;
}

.delay-300 {
    transition-delay: 0.3s;
}

.delay-350 {
    transition-delay: 0.35s;
}

.delay-400 {
    transition-delay: 0.4s;
}

.delay-450 {
    transition-delay: 0.45s;
}

.delay-500 {
    transition-delay: 0.5s;
}

/* Enhanced Hover Effects */
.solution-card:hover {
    border-color: var(--color-accent);
    background: #f0fdf4;
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.step-item:hover .step-icon {
    transform: scale(1.1) rotate(5deg);
}

/* Pulse animation for CTA */
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.4);
    }

    70% {
        box-shadow: 0 0 0 10px rgba(74, 222, 128, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(74, 222, 128, 0);
    }
}

.btn-primary {
    animation: pulse 2s infinite;
}

.btn-primary:hover {
    animation: none;
    background-color: var(--color-accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px -5px rgba(74, 222, 128, 0.4);
}