:root {
    /* 🌑 Base Colors */
    --bg-primary: #0a0f0d;
    --bg-secondary: #111827;
    
    /* 🪟 Glass Surface */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    /* 🟢 Primary Accent — Solar Green */
    --solar-green-start: #22c55e;
    --solar-green-end: #4ade80;
    --solar-green-gradient: linear-gradient(135deg, var(--solar-green-start), var(--solar-green-end));
    
    /* 🟡 Secondary Accent — Sunlight Yellow */
    --sunlight-yellow-start: #facc15;
    --sunlight-yellow-end: #fde047;
    --sunlight-yellow-gradient: linear-gradient(135deg, var(--sunlight-yellow-start), var(--sunlight-yellow-end));
    
    /* 🔵 Highlight Accent — Energy Blue */
    --energy-blue-start: #3b82f6;
    --energy-blue-end: #60a5fa;
    --energy-blue-gradient: linear-gradient(135deg, var(--energy-blue-start), var(--energy-blue-end));
    
    /* ✨ Glow Effects */
    --glow-green: rgba(34, 197, 94, 0.35);
    --glow-yellow: rgba(250, 204, 21, 0.35);
    --glow-blue: rgba(59, 130, 246, 0.35);
    
    /* 📝 Typography */
    --text-primary: #f9fafb;
    --text-secondary: #d1fae5;
    --text-muted: #6b7280;
    
    /* 🧱 Layout */
    --max-width: 1280px;
    --space-desk: 120px;
    --space-tab: 80px;
    --space-mob: 60px;
    
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
}

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

html {
    scroll-behavior: smooth;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
}

body {
    overflow-x: hidden;
    line-height: 1.6;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(34, 197, 94, 0.03), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(250, 204, 21, 0.03), transparent 25%);
    background-attachment: fixed;
}

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

ul {
    list-style: none;
}

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

/* Typography */
h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.5rem; }

p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.text-gradient-green {
    background: var(--solar-green-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.text-gradient-yellow {
    background: var(--sunlight-yellow-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtext {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* Layout System */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: var(--space-desk) 0;
}

.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

@media (max-width: 1024px) {
    .section { padding: var(--space-tab) 0; }
}

@media (max-width: 768px) {
    .section { padding: var(--space-mob) 0; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Glassmorphism Utilities */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid var(--glass-border);
}

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(rgba(255,255,255,0.2), transparent);
    border-radius: var(--radius-md);
    pointer-events: none;
}

.btn:active {
    transform: scale(0.96);
}

.btn-primary {
    background: var(--solar-green-gradient);
    color: var(--bg-primary);
    box-shadow: 0 4px 15px var(--glow-green);
}

.btn-primary:hover {
    box-shadow: 0 8px 25px var(--glow-green);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--solar-green-start);
}

.btn-secondary:hover {
    background: var(--glass-bg);
    box-shadow: 0 0 15px var(--glow-green);
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid rgba(34, 197, 94, 0.2);
    transition: background 0.3s ease;
}

header.scrolled {
    background: rgba(10, 15, 13, 0.85);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    color: var(--solar-green-start);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--solar-green-gradient);
    transition: width 0.3s ease;
    box-shadow: 0 0 8px var(--glow-green);
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 900px) {
    .nav-links {
        position: fixed;
        top: 80px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--bg-primary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: right 0.4s ease;
    }
    .nav-links.active {
        right: 0;
    }
    .mobile-menu-btn {
        display: block;
    }
    .header-cta {
        display: none;
    }
}

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

/* Sun Glow Animation Background */
.hero::before {
    content: '';
    position: absolute;
    top: -10%;
    right: -5%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--glow-yellow) 0%, transparent 60%);
    opacity: 0.5;
    animation: pulseSunlight 8s infinite alternate ease-in-out;
    z-index: -1;
    border-radius: 50%;
    filter: blur(60px);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text-box {
    z-index: 2;
    animation: fadeUp 1s ease forwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.hero-image-box {
    position: relative;
    z-index: 2;
    animation: fadeLeft 1s ease forwards;
}

.hero-image-box img {
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    border: 1px solid var(--glass-border);
}

/* Floating Particles */
.particle {
    position: absolute;
    background: var(--solar-green-start);
    border-radius: 50%;
    opacity: 0.3;
    animation: floatParticle 10s infinite linear;
}

@media (max-width: 900px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-buttons {
        justify-content: center;
    }
    .hero-image-box {
        order: -1;
    }
    .hero::before {
        top: -20%; right: auto; left: 50%; transform: translateX(-50%);
        width: 100vw; height: 100vw;
    }
}

/* Product Card */
.product-showcase {
    background: var(--bg-secondary);
    position: relative;
}

.product-card {
    border-radius: var(--radius-lg);
    padding: 3rem;
    position: relative;
    border: 1px solid transparent;
    background: linear-gradient(var(--bg-primary), var(--bg-primary)) padding-box,
                var(--solar-green-gradient) border-box;
    box-shadow: inset 0 0 20px rgba(255,255,255,0.02), 0 10px 40px rgba(0,0,0,0.3);
}

.product-card-inner {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 3rem;
    align-items: center;
}

.product-image-wrapper {
    position: relative;
}

.product-image-wrapper::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 10%;
    width: 80%;
    height: 20px;
    background: var(--glow-green);
    filter: blur(20px);
    z-index: -1;
}

.feature-list {
    margin: 2rem 0;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-list i {
    color: var(--solar-green-start);
    font-size: 1.2rem;
}

.price-tag {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--sunlight-yellow-start);
    margin-bottom: 2rem;
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(250, 204, 21, 0.1);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(250, 204, 21, 0.2);
}

@media (max-width: 768px) {
    .product-card-inner { grid-template-columns: 1fr; }
    .product-card { padding: 1.5rem; }
}

/* Technology / Use Cases Cards */
.tech-card, .use-case-card {
    padding: 2rem;
    border-radius: var(--radius-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.tech-card:hover, .use-case-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.4), inset 0 0 0 1px var(--solar-green-start);
}

.icon-wrapper {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    background: var(--glass-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--solar-green-start);
    border: 1px solid rgba(34, 197, 94, 0.3);
    box-shadow: 0 0 20px var(--glow-green);
}

.use-case-card {
    text-align: left;
    padding: 0;
    overflow: hidden;
}

.use-case-img {
    height: 200px;
    width: 100%;
    object-fit: cover;
}

.use-case-content {
    padding: 1.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 1rem;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--solar-green-start);
    box-shadow: 0 0 10px var(--glow-green);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* Footer */
footer {
    background: #050806;
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--glass-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.footer-col ul li {
    margin-bottom: 0.75rem;
}

.footer-col ul li a {
    color: var(--text-muted);
}

.footer-col ul li a:hover {
    color: var(--solar-green-start);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 900px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
    .footer-grid { grid-template-columns: 1fr; }
}

/* Animations */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeLeft {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes pulseSunlight {
    0% { transform: scale(1); opacity: 0.4; }
    100% { transform: scale(1.1); opacity: 0.6; }
}

@keyframes floatParticle {
    0% { transform: translateY(0) rotate(0deg); opacity: 0; }
    50% { opacity: 0.5; }
    100% { transform: translateY(-100vh) rotate(360deg); opacity: 0; }
}

/* Utility Pages (About, Terms, etc) */
.page-header {
    padding: 150px 0 80px;
    text-align: center;
    background: linear-gradient(to bottom, var(--bg-secondary), var(--bg-primary));
    border-bottom: 1px solid var(--glass-border);
}

.content-block {
    max-width: 800px;
    margin: 0 auto;
}

.content-block h2 {
    margin-top: 2rem;
    color: var(--text-secondary);
}