/* UrbanTree.tech - Liquid Glass Design System */

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors - Nature-inspired with glass overlays */
    --primary-green: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --accent-emerald: #6ee7b7;
    --earth-brown: #92400e;
    --sky-blue: #0ea5e9;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius - Only 2xl and full */
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== GLOBAL RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: #e2e8f0;
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ===== GLASS CARD BASE ===== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px var(--glass-shadow);
    transition: all 0.4s var(--transition-smooth);
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
    box-shadow: 0 12px 48px rgba(16, 185, 129, 0.15);
    transform: translateY(-2px);
}

/* ===== NAVIGATION ===== */
.glass-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--primary-green);
}

.text-accent {
    color: var(--primary-green);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    transition: all 0.3s var(--transition-smooth);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-green);
    background: rgba(16, 185, 129, 0.1);
}

.cta-button {
    padding: 0.75rem 1.5rem;
    background: var(--primary-green);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
}

.cta-button:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem 4rem;
    overflow: hidden;
}

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

.gradient-orb {
    position: absolute;
    border-radius: var(--radius-full);
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--primary-green);
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--sky-blue);
    bottom: 20%;
    right: 15%;
    animation-delay: -7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: var(--accent-emerald);
    top: 50%;
    left: 50%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(30px, -30px) rotate(5deg); }
    50% { transform: translate(-20px, 20px) rotate(-5deg); }
    75% { transform: translate(20px, 10px) rotate(3deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1280px;
    width: 100%;
}

.hero-card {
    padding: var(--spacing-2xl);
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: #fff;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: #cbd5e1;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.primary-button,
.secondary-button {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
}

.primary-button {
    background: var(--primary-green);
    color: white;
}

.primary-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(16, 185, 129, 0.4);
}

.secondary-button {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid var(--glass-border);
}

.secondary-button:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary-green);
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-green);
}

.stat-label {
    color: #94a3b8;
    font-size: 0.9rem;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--glass-border);
}

/* ===== SECTIONS ===== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    color: #fff;
}

.section-subtitle {
    font-size: 1.25rem;
    color: #94a3b8;
}

/* ===== FEATURES SECTION ===== */
.features {
    background: linear-gradient(180deg, transparent 0%, rgba(16, 185, 129, 0.05) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: var(--spacing-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-md);
    color: var(--primary-green);
    padding: 12px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius-2xl);
}

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

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: #fff;
}

.feature-description {
    color: #94a3b8;
    line-height: 1.7;
}

/* ===== TECHNOLOGY SECTION ===== */
.tech-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    align-items: center;
}

.tech-visual {
    padding: var(--spacing-xl);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-diagram {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.tech-layer {
    padding: 1.5rem;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(16, 185, 129, 0.3);
    animation: slideIn 0.6s var(--transition-smooth) both;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.layer-label {
    font-weight: 600;
    color: var(--primary-green);
    text-align: center;
}

.tech-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.tech-item {
    padding: var(--spacing-md);
}

.tech-item h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.tech-item p {
    color: #94a3b8;
    line-height: 1.6;
}

/* ===== ABOUT SECTION ===== */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    align-items: center;
}

.about-paragraph {
    margin-bottom: var(--spacing-md);
    color: #cbd5e1;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: var(--spacing-xl);
}

.about-stat {
    padding: var(--spacing-md);
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-green);
}

.stat-text {
    color: #94a3b8;
    font-size: 0.9rem;
}

.about-image {
    padding: var(--spacing-xl);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder svg {
    width: 100%;
    max-width: 300px;
    height: auto;
}

/* ===== CONTACT SECTION ===== */
.contact {
    background: linear-gradient(180deg, rgba(16, 185, 129, 0.05) 0%, transparent 100%);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.contact-form {
    padding: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #cbd5e1;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s var(--transition-smooth);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-green);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #64748b;
}

.submit-button {
    width: 100%;
    padding: 1rem;
    background: var(--primary-green);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
}

.submit-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(16, 185, 129, 0.3);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.info-card {
    padding: var(--spacing-lg);
}

.info-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-green);
}

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

.info-card h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.info-card p {
    color: #94a3b8;
    line-height: 1.7;
}

/* ===== FOOTER ===== */
.footer {
    background: rgba(15, 23, 42, 0.8);
    border-top: 1px solid var(--glass-border);
    padding: 3rem 0 1.5rem;
}

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

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-tagline {
    color: #94a3b8;
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    color: #fff;
    font-size: 1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.5rem;
}

.footer-column ul li a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.3s var(--transition-smooth);
}

.footer-column ul li a:hover {
    color: var(--primary-green);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    color: #64748b;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.05);
    color: #94a3b8;
    transition: all 0.3s var(--transition-smooth);
}

.social-links a:hover {
    background: var(--primary-green);
    color: white;
    transform: translateY(-2px);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-stats {
        gap: 1rem;
    }
    
    .stat-divider {
        display: none;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}