:root {
    /* HVAC Color Palette */
    --cool-blue: #0A7ABF;
    --ice-blue: #4DB8E8;
    --warm-orange: #E85D2C;
    --heat-red: #C7402C;
    --metal-gray: #6B7280;
    --steel-dark: #374151;
    --light-gray: #F3F4F6;
    --white: #FFFFFF;
    --dark: #1F2937;
    
    /* Gradients */
    --cool-gradient: linear-gradient(135deg, var(--cool-blue), var(--ice-blue));
    --warm-gradient: linear-gradient(135deg, var(--warm-orange), var(--heat-red));
    --neutral-gradient: linear-gradient(135deg, var(--steel-dark), var(--metal-gray));
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Work Sans', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--dark);
    font-weight: 700;
    font-size: 1.25rem;
    font-family: 'Outfit', sans-serif;
}

.zia-icon {
    color: var(--warm-orange);
    transition: transform 0.3s ease;
}

.logo:hover .zia-icon {
    transform: rotate(90deg);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--cool-blue);
}

.nav-menu a.calculator-link {
    background: var(--cool-gradient);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nav-menu a.calculator-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(10, 122, 191, 0.3);
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    list-style: none;
    padding: 12px 0;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    min-width: 200px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    padding: 0;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: var(--dark);
    text-decoration: none;
    transition: background 0.3s ease;
}

.dropdown-menu a:hover {
    background: var(--light-gray);
    color: var(--cool-blue);
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
    background: linear-gradient(135deg, #0A7ABF 0%, #4DB8E8 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><circle cx="50" cy="50" r="30" fill="rgba(255,255,255,0.03)"/></svg>'),
        linear-gradient(135deg, rgba(10, 122, 191, 0.9) 0%, rgba(77, 184, 232, 0.8) 100%);
    background-size: 100px 100px, cover;
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    color: white;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 24px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.hero .highlight {
    color: #FFD93D;
    text-shadow: 0 2px 10px rgba(255, 217, 61, 0.3);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.95;
    line-height: 1.8;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.feature-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 12px 20px;
    border-radius: 50px;
    font-weight: 500;
}

.feature-badge .icon {
    font-size: 1.2rem;
    color: #FFD93D;
}

/* CTA Buttons */
.cta-button {
    display: inline-block;
    padding: 16px 40px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-family: 'Outfit', sans-serif;
}

.cta-button.primary {
    background: white;
    color: var(--cool-blue);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.cta-button.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.3);
}

.cta-button.large {
    padding: 20px 50px;
    font-size: 1.2rem;
}

/* About Section */
.about-section {
    padding: 100px 24px;
    background: white;
    position: relative;
}

.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml,<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg"><circle cx="100" cy="100" r="80" fill="none" stroke="rgba(10,122,191,0.03)" stroke-width="2"/><circle cx="100" cy="100" r="50" fill="none" stroke="rgba(232,93,44,0.03)" stroke-width="2"/></svg>');
    background-size: 200px 200px;
    opacity: 0.5;
    pointer-events: none;
}

.about-content {
    position: relative;
    z-index: 1;
}

.about-section h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 24px;
    color: var(--dark);
}

.section-intro {
    text-align: center;
    font-size: 1.2rem;
    color: var(--metal-gray);
    max-width: 800px;
    margin: 0 auto 60px;
    line-height: 1.8;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.benefit-card {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    border-color: var(--cool-blue);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
}

.benefit-icon.cool {
    background: var(--cool-gradient);
}

.benefit-icon.warm {
    background: var(--warm-gradient);
}

.benefit-icon.neutral {
    background: var(--neutral-gradient);
}

.benefit-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--dark);
}

.benefit-card p {
    color: var(--metal-gray);
    line-height: 1.8;
}

/* Cities Section */
.cities-section {
    padding: 100px 24px;
    background: var(--light-gray);
}

.cities-section h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 24px;
    color: var(--dark);
}

.cities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-top: 60px;
}

.city-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.city-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.city-image {
    position: relative;
    height: 220px;
    background-size: cover;
    background-position: center;
}

.city-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(0, 0, 0, 0.3) 100%);
}

.city-content {
    padding: 30px;
}

.city-content h3 {
    font-size: 1.75rem;
    margin-bottom: 12px;
    color: var(--dark);
}

.city-content p {
    color: var(--metal-gray);
    margin-bottom: 24px;
    line-height: 1.6;
}

.city-button {
    display: inline-block;
    padding: 12px 28px;
    background: var(--cool-gradient);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.city-button:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(10, 122, 191, 0.3);
}

/* CTA Section */
.cta-section {
    padding: 100px 24px;
    background: var(--cool-gradient);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><path d="M50 10 L90 50 L50 90 L10 50 Z" fill="rgba(255,255,255,0.05)"/></svg>');
    background-size: 100px 100px;
    opacity: 0.3;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    font-size: 2.5rem;
    color: white;
    margin-bottom: 20px;
}

.cta-section p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
}

/* Footer */
.footer {
    background: var(--dark);
    color: white;
    padding: 60px 24px 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-weight: 700;
    font-size: 1.25rem;
}

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--ice-blue);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

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

.fade-in-scroll {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 16px;
    }
    
    .about-section h2,
    .cities-section h2,
    .cta-section h2 {
        font-size: 2rem;
    }
    
    .section-intro {
        font-size: 1.1rem;
    }
    
    .cities-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }
    
    .benefit-card,
    .city-content {
        padding: 24px;
    }
}