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

:root {
    /* Airthings Brand Colors */
    --airthings-primary: #FFC000;
    --airthings-secondary: #FF8C00;
    --airthings-text: #2D3748;

    /* TVA Solution Brand Colors */
    --tva-primary: #4A90E2;
    --tva-secondary: #357ABD;
    --tva-accent: #2C5282;

    /* Partnership Colors */
    --partnership-gradient: linear-gradient(135deg, #FFC000 0%, #4A90E2 100%);
    --partnership-gradient-subtle: linear-gradient(135deg, rgba(255, 192, 0, 0.1) 0%, rgba(74, 144, 226, 0.1) 100%);

    /* Neutral Colors */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Typography */
    --font-primary: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Spacing */
    --section-padding: 80px 0;
    --container-padding: 0 20px;
    --container-max-width: 1200px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Animations */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--container-padding);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logos .logo-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.airthings-logo {
    height: 35px;
}

.tva-logo {
    height: 45px;
}

.logo-text {
    font-weight: 700;
    font-size: 24px;
    text-decoration: none;
}

.airthings-brand {
    color: var(--airthings-primary);
}

.tva-brand {
    color: var(--tva-primary);
}

.partnership-symbol {
    color: var(--gray-400);
    font-size: 20px;
    margin: 0 4px;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--tva-primary);
}

.nav-menu a:not(.cta-button)::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--partnership-gradient);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Buttons */
.cta-button, .primary-button {
    background: var(--partnership-gradient);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
}

.cta-button:hover, .primary-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.secondary-button {
    background: transparent;
    color: var(--gray-700);
    padding: 12px 24px;
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
}

.secondary-button:hover {
    border-color: var(--tva-primary);
    color: var(--tva-primary);
    transform: translateY(-2px);
}

.large {
    padding: 16px 32px;
    font-size: 18px;
}

/* Hero Section */
.hero {
    padding: 140px 0 80px;
    background: var(--partnership-gradient-subtle);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(74,144,226,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    z-index: 0;
}

.hero-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Floating Cards Animation */
.floating-cards {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.monitor-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-xl);
    width: 280px;
    position: relative;
    transition: var(--transition-slow);
}

.monitor-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.airthings-card {
    border-left: 4px solid var(--airthings-primary);
    animation: float 6s ease-in-out infinite;
}

.tva-card {
    border-left: 4px solid var(--tva-primary);
    margin-top: 80px;
    margin-left: -40px;
    animation: float 6s ease-in-out infinite 3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.monitor-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-800);
}

.monitor-card p {
    color: var(--gray-600);
    line-height: 1.5;
}

.connector-line {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 2px;
    background: var(--partnership-gradient);
    transform: translate(-50%, -50%) rotate(25deg);
    z-index: -1;
    opacity: 0.6;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.section-header p {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* Partnership Value Section */
.partnership-value {
    padding: var(--section-padding);
    background: var(--gray-50);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.value-card {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid transparent;
}

.value-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.value-card:nth-child(1) {
    border-top-color: var(--airthings-primary);
}

.value-card:nth-child(2) {
    border-top-color: var(--partnership-gradient);
}

.value-card:nth-child(3) {
    border-top-color: var(--tva-primary);
}

.value-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 24px;
}

.airthings-accent {
    background: rgba(255, 192, 0, 0.1);
    color: var(--airthings-primary);
}

.partnership-accent {
    background: var(--partnership-gradient-subtle);
    color: var(--tva-primary);
}

.tva-accent {
    background: rgba(74, 144, 226, 0.1);
    color: var(--tva-primary);
}

.value-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.value-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Customer Journey Section */
.customer-journey {
    padding: var(--section-padding);
}

.customer-journey h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: var(--gray-900);
}

.journey-paths {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 1000px;
    margin: 0 auto;
}

.journey-path {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.journey-path:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.path-header {
    display: flex;
    align-items: center;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 2px solid var(--gray-100);
}

.airthings-path {
    border-bottom-color: rgba(255, 192, 0, 0.2);
}

.tva-path {
    border-bottom-color: rgba(74, 144, 226, 0.2);
}

.path-logo {
    font-weight: 700;
    font-size: 1.25rem;
    padding: 12px 24px;
    border-radius: 8px;
    color: white;
}

.airthings-path .path-logo {
    background: var(--airthings-primary);
}

.tva-path .path-logo {
    background: var(--tva-primary);
}

.path-arrow {
    font-size: 24px;
    margin-left: 16px;
    color: var(--gray-400);
}

.path-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--gray-900);
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.benefit-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--gray-50);
    border-radius: 8px;
    transition: var(--transition);
}

.benefit-item:hover {
    background: var(--partnership-gradient-subtle);
}

.benefit-icon {
    font-size: 20px;
    margin-top: 2px;
}

/* Use Cases Section */
.use-cases {
    padding: var(--section-padding);
    background: var(--gray-50);
}

.use-cases h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 60px;
}

.case-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.case-visual {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    position: relative;
    overflow: hidden;
}

.wildfire {
    background: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
}

.warehouse {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
}

.logistics {
    background: linear-gradient(135deg, #50C878 0%, #228B22 100%);
}

.facilities {
    background: linear-gradient(135deg, #9B59B6 0%, #8E44AD 100%);
}

.case-icon {
    position: relative;
    z-index: 1;
}

.case-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.case-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Technology Integration Section */
.technology-integration {
    padding: var(--section-padding);
}

.integration-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.integration-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--gray-900);
}

.integration-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 40px;
    line-height: 1.6;
}

.integration-features {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--partnership-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.feature h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-900);
}

.feature p {
    color: var(--gray-600);
    line-height: 1.5;
}

/* Platform Demo */
.platform-demo {
    position: relative;
}

.demo-screen {
    background: var(--gray-900);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.demo-screen::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--partnership-gradient);
}

.demo-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-700);
}

.demo-title {
    color: white;
    font-weight: 600;
    font-size: 1.125rem;
}

.demo-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.metric-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--gray-800);
    border-radius: 8px;
}

.metric-label {
    color: var(--gray-300);
    font-size: 14px;
}

.metric-value {
    font-weight: 600;
    font-size: 14px;
}

.good {
    color: #10B981;
}

.normal {
    color: var(--airthings-primary);
}

.active {
    color: var(--tva-primary);
}

.alert-banner {
    background: rgba(251, 146, 60, 0.1);
    border: 1px solid #F59E0B;
    border-radius: 8px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
}

.alert-icon {
    font-size: 16px;
}

.alert-banner span:last-child {
    color: #F59E0B;
    font-size: 14px;
    font-weight: 500;
}

/* CTA Section */
.cta-section {
    padding: var(--section-padding);
    background: var(--partnership-gradient-subtle);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--gray-900);
}

.cta-content p {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.contact-info p {
    color: var(--gray-600);
    margin-bottom: 16px;
}

.contact-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.contact-links a {
    color: var(--tva-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.contact-links a:hover {
    color: var(--airthings-primary);
}

.divider {
    color: var(--gray-400);
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: white;
    padding: 40px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-logo {
    height: 30px;
    filter: brightness(0) invert(1);
}

.footer-brand .airthings-logo {
    height: 25px;
}

.footer-brand .tva-logo {
    height: 35px;
}

.footer-brand .airthings-brand {
    color: var(--airthings-primary);
}

.footer-brand .tva-brand {
    color: var(--tva-primary);
}

.footer-brand .partnership-symbol {
    color: var(--gray-400);
}

.footer-links {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-legal {
    text-align: center;
    color: var(--gray-400);
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .floating-cards {
        height: 300px;
    }

    .tva-card {
        margin-top: 40px;
        margin-left: 0;
    }

    .integration-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }

    .journey-paths {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-cta {
        justify-content: center;
    }

    .section-header h2, .use-cases h2, .integration-text h2, .cta-content h2 {
        font-size: 2rem;
    }

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

    .cases-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

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

    .contact-links {
        flex-direction: column;
        gap: 8px;
    }

    .divider {
        display: none;
    }

    :root {
        --section-padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 16px;
    }

    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .monitor-card {
        width: 100%;
        padding: 24px;
    }

    .value-card, .case-card {
        padding: 24px;
    }

    .journey-path {
        padding: 24px;
    }

    .section-header h2, .use-cases h2, .integration-text h2, .cta-content h2 {
        font-size: 1.75rem;
    }

    .logo-text {
        font-size: 20px;
    }

    .logo-img {
        height: 32px;
    }

    .airthings-logo {
        height: 28px;
    }

    .tva-logo {
        height: 36px;
    }
}