/* ===== Design Tokens ===== */
:root {
    --bg-primary: #09090b;
    --bg-secondary: #0f172a;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-teal: #2dd4bf;
    --accent-purple: #8b5cf6;
    --accent-blue: #3b82f6;
    --solar: #f59e0b;
    --battery: #10b981;
    --grid: #6366f1;
    --consumption: #8b5cf6;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
}

/* ===== Light Theme ===== */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f1f5f9;
    --bg-card: rgba(0, 0, 0, 0.03);
    --bg-card-hover: rgba(0, 0, 0, 0.06);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent-teal: #0d9488;
    --accent-purple: #7c3aed;
    --accent-blue: #2563eb;
    --solar: #d97706;
    --battery: #059669;
    --grid: #4f46e5;
    --consumption: #7c3aed;
    --glass-bg: rgba(0, 0, 0, 0.03);
    --glass-border: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .nav.scrolled {
    background: rgba(255, 255, 255, 0.85);
}

[data-theme="light"] .lang-dropdown {
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="light"] .lang-option:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .nav-links.open {
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="light"] .hero {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
}

[data-theme="light"] .metrics {
    background: rgba(241, 245, 249, 0.7);
}

[data-theme="light"] .energy-flow {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
}

[data-theme="light"] .how-it-works {
    background: linear-gradient(180deg, var(--bg-primary), var(--bg-secondary), var(--bg-primary));
}

[data-theme="light"] .platform {
    background: linear-gradient(180deg, var(--bg-primary), var(--bg-secondary));
}

[data-theme="light"] .footer {
    background: rgba(241, 245, 249, 0.5);
}

[data-theme="light"] .ai-code {
    background: rgba(15, 23, 42, 0.9);
}

[data-theme="light"] .ai-code code {
    color: #2dd4bf;
}

[data-theme="light"] .ai-code-header {
    color: #94a3b8;
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .code-prompt {
    color: #94a3b8;
}

[data-theme="light"] .ai-chat-header {
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] .ai-msg-ai {
    background: rgba(0, 0, 0, 0.03);
}

[data-theme="light"] .step-number {
    color: #ffffff;
}

[data-theme="light"] .hero-title {
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-teal) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-theme="light"] .btn-primary {
    color: #ffffff;
}

[data-theme="light"] .btn-secondary:hover {
    border-color: rgba(0, 0, 0, 0.2);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
    font-family: inherit;
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

[data-theme="light"] .theme-toggle:hover {
    border-color: rgba(0, 0, 0, 0.2);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    width: 18px;
    height: 18px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ===== 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: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 18px;
    line-height: 1.6;
    overflow-x: hidden;
}

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

img, svg {
    display: block;
}

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

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
}

.nav.scrolled {
    padding: 12px 0;
    background: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    letter-spacing: -0.02em;
}

.nav-logo svg {
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-login {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.nav-login:hover {
    color: var(--text-primary);
}

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

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all 0.3s ease;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    font-weight: 600;
    border-radius: 100px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-sm {
    font-size: 14px;
    padding: 8px 20px;
}

.btn-lg {
    font-size: 16px;
    padding: 14px 32px;
}

.btn-primary {
    background: var(--accent-teal);
    color: var(--bg-primary);
    box-shadow: 0 0 20px rgba(45, 212, 191, 0.3);
}

.btn-primary:hover {
    background: #5eead4;
    box-shadow: 0 0 30px rgba(45, 212, 191, 0.5);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 0 80px;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

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

.orbit {
    animation: orbit-rotate 30s linear infinite;
    transform-origin: center;
}

.orbit-2 {
    animation-duration: 45s;
    animation-direction: reverse;
}

.orbit-3 {
    animation-duration: 60s;
}

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

.node-dot {
    animation: pulse-dot 3s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 0.6; }
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 1;
}

.hero-title {
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-teal) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 20px);
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Metrics Banner ===== */
.metrics {
    padding: 60px 0;
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
    background: rgba(15, 23, 42, 0.5);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.metric-value {
    display: block;
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.metric-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== Section Headers ===== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ===== Features Grid ===== */
.features {
    padding: 120px 0;
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: all 0.3s ease;
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(45, 212, 191, 0.1);
    border: 1px solid rgba(45, 212, 191, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--accent-teal);
}

.feature-icon-purple {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.2);
    color: var(--accent-purple);
}

.feature-icon-green {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
    color: var(--battery);
}

.feature-icon-blue {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.2);
    color: var(--accent-blue);
}

.feature-icon-indigo {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgba(99, 102, 241, 0.2);
    color: var(--grid);
}

.feature-icon-amber {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.2);
    color: var(--solar);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Energy Flow ===== */
.energy-flow {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
}

.energy-flow-diagram {
    max-width: 900px;
    margin: 0 auto;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    backdrop-filter: blur(16px);
}

.flow-svg {
    width: 100%;
    height: auto;
}

.flow-line {
    animation: dash-flow 1.5s linear infinite;
}

@keyframes dash-flow {
    to { stroke-dashoffset: -24; }
}

.flow-line-battery {
    animation-duration: 2s;
}

.flow-line-grid {
    animation-duration: 2.5s;
}

.flow-line-consumption {
    animation-duration: 1.8s;
}

/* ===== AI Integration ===== */
.ai-section {
    padding: 120px 0;
    position: relative;
}

.ai-section::before {
    content: '';
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.ai-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.ai-chat {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    backdrop-filter: blur(16px);
}

.ai-chat-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.02);
}

.ai-chat-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ef4444;
}

.ai-chat-dot-yellow { background: #eab308; }
.ai-chat-dot-green { background: #22c55e; }

.ai-chat-title {
    margin-left: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.ai-chat-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.ai-msg {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.6;
    max-width: 90%;
}

.ai-msg-user {
    background: rgba(45, 212, 191, 0.1);
    border: 1px solid rgba(45, 212, 191, 0.2);
    align-self: flex-end;
    color: var(--accent-teal);
}

.ai-msg-ai {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    align-self: flex-start;
    color: var(--text-secondary);
}

.ai-msg-ai strong {
    color: var(--text-primary);
}

.ai-highlight {
    font-weight: 600;
}

.ai-highlight.green { color: var(--solar); }
.ai-highlight.teal { color: var(--battery); }
.ai-highlight.blue { color: var(--grid); }
.ai-highlight.purple { color: var(--consumption); }

.ai-content .section-title {
    text-align: left;
}

.ai-content .section-subtitle {
    text-align: left;
    margin: 0 0 32px 0;
}

.ai-code {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 16px;
}

.ai-code-header {
    padding: 10px 16px;
    border-bottom: 1px solid var(--glass-border);
    font-size: 12px;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.02);
}

.ai-code pre {
    padding: 16px;
    overflow-x: auto;
}

.ai-code code {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 14px;
    color: var(--accent-teal);
    line-height: 1.6;
}

.code-prompt {
    color: var(--text-secondary);
    margin-right: 8px;
    user-select: none;
}

.ai-note {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== How It Works ===== */
.how-it-works {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-primary), var(--bg-secondary), var(--bg-primary));
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    position: relative;
}

.step {
    text-align: center;
    position: relative;
    padding: 0 16px;
}

.step-number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-blue));
    color: var(--bg-primary);
    font-size: 22px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    position: relative;
    z-index: 1;
}

.step-connector {
    position: absolute;
    top: 28px;
    left: calc(50% + 36px);
    width: calc(100% - 36px);
    height: 2px;
    background: linear-gradient(90deg, var(--accent-teal), rgba(59, 130, 246, 0.3));
}

.step:last-child .step-connector {
    display: none;
}

.step h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.step p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Use Cases ===== */
.use-cases {
    padding: 120px 0;
}

.use-case {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 80px;
}

.use-case:last-child {
    margin-bottom: 0;
}

.use-case-reverse {
    direction: rtl;
}

.use-case-reverse > * {
    direction: ltr;
}

.use-case-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.use-case-icon-wrap {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.use-case-residential {
    background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
    border: 1px solid rgba(245, 158, 11, 0.15);
    color: var(--solar);
}

.use-case-commercial {
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
    border: 1px solid rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
}

.use-case-community {
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    border: 1px solid rgba(99, 102, 241, 0.15);
    color: var(--grid);
}

.use-case-content h3 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.use-case-tagline {
    font-size: 18px;
    color: var(--accent-teal);
    font-weight: 500;
    margin-bottom: 16px;
}

.use-case-content p:last-child {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Extensible Platform ===== */
.platform {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-primary), var(--bg-secondary));
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.platform-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    backdrop-filter: blur(16px);
    transition: all 0.3s ease;
}

.platform-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
}

.platform-card svg {
    margin-bottom: 20px;
}

.platform-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.platform-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 120px 0;
}

.cta-box {
    text-align: center;
    background: linear-gradient(135deg, rgba(45, 212, 191, 0.08), rgba(139, 92, 246, 0.08));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 80px 40px;
    backdrop-filter: blur(16px);
}

.cta-box h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.cta-box p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--glass-border);
    background: rgba(15, 23, 42, 0.3);
}

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

.footer-brand p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 12px;
}

.footer-links h5 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-links a {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    padding: 4px 0;
    transition: color 0.2s;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--glass-border);
    font-size: 13px;
    color: var(--text-secondary);
}

/* ===== Language Switcher ===== */
.lang-switcher {
    position: relative;
}

.lang-switcher-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 6px 12px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-switcher-btn:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.lang-switcher-btn svg {
    display: inline-block;
    flex-shrink: 0;
}

.lang-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 140px;
    background: rgba(9, 9, 11, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 6px;
    z-index: 1001;
}

.lang-dropdown.open {
    display: block;
}

.lang-option {
    display: block;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: all 0.15s;
}

.lang-option:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.lang-option.active {
    color: var(--accent-teal);
}

/* ===== Scroll Animations ===== */
.animate-in {
    opacity: 0;
    transform: translateY(30px) scale(0.97);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transition-delay: var(--delay, 0ms);
}

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

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

    .ai-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .ai-content .section-title,
    .ai-content .section-subtitle {
        text-align: center;
    }

    .ai-content .section-subtitle {
        margin: 0 auto 32px;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 16px;
    }

    .nav-links, .nav-actions .nav-login {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(9, 9, 11, 0.95);
        backdrop-filter: blur(16px);
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--glass-border);
    }

    .nav-links.open a {
        font-size: 16px;
        padding: 8px 0;
    }

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

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

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

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

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

    .steps {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .step-connector {
        display: none;
    }

    .use-case,
    .use-case-reverse {
        grid-template-columns: 1fr;
        gap: 32px;
        direction: ltr;
    }

    .use-case-visual {
        order: -1;
    }

    .use-case-icon-wrap {
        width: 140px;
        height: 140px;
    }

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

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

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .energy-flow-diagram {
        padding: 16px;
        overflow-x: auto;
    }

    .flow-svg {
        min-width: 600px;
    }

    .cta-box {
        padding: 48px 24px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

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

    .cta-actions .btn {
        width: 100%;
        justify-content: center;
    }

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

    .metric-value {
        font-size: 22px;
    }

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