/* =========================================
   Clean Technology — Professional Stylesheet
   ========================================= */

/* --- Custom Properties --- */
:root {
    --bg-primary: #0A0F1C;
    --bg-secondary: #0F1629;
    --bg-card: #141B2F;
    --bg-card-hover: #1A2340;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border-color: rgba(148, 163, 184, 0.1);
    --border-hover: rgba(148, 163, 184, 0.2);
    --accent-primary: #F59E0B;
    --accent-secondary: #06B6D4;
    --accent-green: #10B981;
    --accent-purple: #8B5CF6;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 60px rgba(245, 158, 11, 0.08);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', sans-serif;
}

/* --- Reset --- */
*, *::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, svg {
    display: block;
    max-width: 100%;
}

/* --- Utility --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 15, 28, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-base);
}

.nav.scrolled {
    background: rgba(10, 15, 28, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-logo-icon {
    width: 36px;
    height: 36px;
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
}

.nav-links a:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

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

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg canvas {
    width: 100%;
    height: 100%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, var(--bg-secondary), transparent);
    z-index: 1;
}

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

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 32px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 10vw, 7rem);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.04em;
    margin-bottom: 28px;
}

.hero-title-line {
    display: block;
}

.hero-title-line.accent {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto 48px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

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

.hero-stat-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.hero-stat-suffix {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.hero-stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border-color);
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--accent-primary), #D97706);
    color: var(--bg-primary);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 100px;
    transition: var(--transition-base);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3);
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(245, 158, 11, 0.4);
}

.hero-cta svg {
    animation: bounceDown 2s ease-in-out infinite;
}

@keyframes bounceDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

/* --- Sections --- */
.section {
    padding: 120px 0;
}

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

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 72px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    line-height: 1.15;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* --- Overview Grid --- */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.overview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: var(--transition-base);
}

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

.overview-card-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
    margin-bottom: 20px;
}

.overview-card h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

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

/* --- Sectors Grid --- */
.sectors-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.sector-card {
    display: grid;
    grid-template-columns: 200px 1fr;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-base);
}

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

.sector-card-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(255, 255, 255, 0.02);
}

.sector-card-visual svg {
    width: 100%;
    max-width: 160px;
}

.sector-card-content {
    padding: 32px;
}

.sector-card-content h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.sector-card-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.sector-metric {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.sector-metric-value {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.sector-metric-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- Charts --- */
.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 48px;
}

.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.chart-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 28px;
    color: var(--text-secondary);
    letter-spacing: -0.01em;
}

/* Bar Chart */
.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.bar-row {
    display: grid;
    grid-template-columns: 48px 1fr 72px;
    align-items: center;
    gap: 12px;
}

.bar-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    font-family: var(--font-display);
}

.bar-track {
    height: 28px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    width: 0;
    background: var(--bar-color);
    border-radius: var(--radius-sm);
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0.85;
}

.bar-fill.animated {
    width: calc(var(--target-width) * 1%);
}

.bar-value {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: right;
    font-family: var(--font-display);
}

/* Donut Chart */
.donut-chart-container {
    display: flex;
    align-items: center;
    gap: 32px;
}

.donut-chart {
    width: 200px;
    flex-shrink: 0;
}

.donut-chart svg {
    transform: rotate(-90deg);
}

.donut-segment {
    fill: none;
    stroke-width: 28;
    transition: stroke-dasharray 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.donut-center-text {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    fill: var(--text-primary);
    transform: rotate(90deg);
    transform-origin: 100px 100px;
}

.donut-center-label {
    font-family: var(--font-body);
    font-size: 11px;
    fill: var(--text-muted);
    transform: rotate(90deg);
    transform-origin: 100px 100px;
}

.donut-legend {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* Data Highlights */
.data-highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.data-highlight-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    text-align: center;
    transition: var(--transition-base);
}

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

.data-highlight-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    padding: 10px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
    color: var(--highlight-color);
}

.data-highlight-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
    letter-spacing: -0.02em;
}

.data-highlight-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- Timeline --- */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline-line {
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary), var(--accent-green));
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-dot {
    position: absolute;
    left: -40px;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 2px var(--accent-primary);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: var(--transition-base);
}

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

.timeline-year {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: var(--font-display);
    margin-bottom: 12px;
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

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

/* --- Challenges --- */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.challenge-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: var(--transition-base);
}

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

.challenge-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-primary);
    opacity: 0.3;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.challenge-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.challenge-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Future --- */
.future-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.future-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-base);
    position: relative;
}

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

.future-card-large {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(6, 182, 212, 0.08));
}

.future-card-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(139, 92, 246, 0.1), transparent 60%);
}

.future-card-content {
    position: relative;
    padding: 36px;
}

.future-card-large .future-card-content {
    padding: 48px;
}

.future-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-secondary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.future-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.future-card-large h3 {
    font-size: 1.6rem;
}

.future-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* --- Footer --- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    width: 36px;
    height: 36px;
    color: var(--accent-primary);
    margin-bottom: 16px;
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--text-muted);
    max-width: 300px;
    line-height: 1.7;
}

.footer-links h4 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.footer-links a {
    display: block;
    font-size: 0.88rem;
    color: var(--text-muted);
    padding: 4px 0;
    transition: var(--transition-base);
}

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

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
    .overview-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .data-highlights {
        grid-template-columns: repeat(2, 1fr);
    }

    .challenges-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .future-card-large {
        grid-column: span 1;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10, 15, 28, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
    }

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

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

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

    .nav-toggle.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-stat-divider {
        display: none;
    }

    .hero-stat-value {
        font-size: 2rem;
    }

    .section {
        padding: 80px 0;
    }

    .section-header {
        margin-bottom: 48px;
    }

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

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

    .sector-card-visual {
        padding: 24px;
    }

    .sector-card-visual svg {
        max-width: 120px;
    }

    .donut-chart-container {
        flex-direction: column;
        align-items: center;
    }

    .data-highlights {
        grid-template-columns: 1fr 1fr;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 3rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .data-highlights {
        grid-template-columns: 1fr;
    }
}