:root {
            --primary-blue: #1e40af;
            --dark-navy: #1e293b;
            --text-primary: #0f172a;
            --text-secondary: #64748b;
            --bg-light: #f8fafc;
            --border-color: #e2e8f0;
            --orange-accent: #f97316;
            --hvac-blue: #0ea5e9;
        }

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

        .icon-svg {
            width: 1em;
            height: 1em;
            display: inline-block;
            vertical-align: -0.125em;
            flex-shrink: 0;
        }

        /* Role tabs */
        .role-tab {
            padding: 0.6rem 1.5rem;
            border-radius: 50px;
            border: 2px solid var(--border-color);
            background: white;
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .role-tab:hover {
            border-color: var(--primary-blue);
            color: var(--primary-blue);
        }

        .role-tab.active {
            background: var(--primary-blue);
            border-color: var(--primary-blue);
            color: white;
        }

        .role-panel.hidden {
            display: none;
        }

        .role-panel ul {
            list-style: none;
        }

        .role-panel li {
            position: relative;
            padding-left: 1.5rem;
        }

        .role-panel li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.55rem;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--hvac-blue);
        }

        body {
            font-family: 'Inter', sans-serif;
            background: #ffffff;
            color: var(--text-primary);
            line-height: 1.6;
        }

        /* Typography */
        h1,
        h2,
        h3 {
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.15;
            letter-spacing: -0.01em;
        }

        /* Subtle animations */
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.6s ease;
        }

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

        /* Professional card with subtle hover */
        .card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 2rem;
            transition: all 0.3s ease;
        }

        .card:hover {
            border-color: var(--primary-blue);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
            transform: translateY(-4px);
        }

        /* Buttons */
        .btn-primary {
            background: var(--orange-accent);
            color: white;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            background: #ea580c;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
        }

        .btn-secondary {
            background: white;
            color: var(--primary-blue);
            padding: 1rem 2rem;
            border-radius: 8px;
            border: 2px solid var(--primary-blue);
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: all 0.3s ease;
        }

        .btn-secondary:hover {
            background: var(--bg-light);
            transform: translateY(-2px);
        }

        /* Stats box */
        .stat-box {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1.5rem;
            text-align: center;
            transition: all 0.3s ease;
        }

        .stat-box:hover {
            border-color: var(--hvac-blue);
            transform: translateY(-2px);
        }

        .stat-number {
            font-family: 'Space Grotesk', sans-serif;
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1;
        }

        .stat-label {
            color: var(--text-secondary);
            font-size: 0.875rem;
            margin-top: 0.5rem;
        }

        /* Badge */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem 1rem;
            background: rgba(14, 165, 233, 0.1);
            border: 1px solid rgba(14, 165, 233, 0.3);
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--hvac-blue);
        }

        /* Trust badge */
        .trust-badge {
            background: linear-gradient(135deg, rgba(14, 165, 233, 0.1), rgba(37, 99, 235, 0.1));
            border: 2px solid rgba(14, 165, 233, 0.3);
            border-radius: 16px;
            padding: 1.5rem;
            text-align: center;
        }

        /* Video container */
        .video-wrapper {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
            border: 1px solid var(--border-color);
        }

        /* Demo cards */
        .demo-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 1.5rem;
            text-align: center;
            transition: all 0.3s ease;
            text-decoration: none;
            color: var(--text-primary);
            display: block;
        }

        .demo-card:hover {
            border-color: var(--primary-blue);
            transform: translateY(-4px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.15);
        }

        /* Info box */
        .info-box {
            background: rgba(14, 165, 233, 0.05);
            border-left: 4px solid var(--hvac-blue);
            padding: 1rem 1.5rem;
            border-radius: 8px;
            margin: 1rem 0;
        }

        .section-title {
            color: var(--text-primary);
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 3.5rem;
            }
        }

        /* Minimal background texture — plain dot grid, no illustrations */
        .page-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            background-image:
                radial-gradient(rgba(30, 64, 175, 0.14) 1.3px, transparent 1.3px),
                radial-gradient(rgba(30, 64, 175, 0.07) 1px, transparent 1px);
            background-size: 24px 24px, 24px 24px;
            background-position: 0 0, 12px 12px;
        }

        /* Clean scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg-light);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--text-secondary);
            border-radius: 4px;
        }

        /* Highlight box for customization message */
        .highlight-box {
            background: linear-gradient(135deg, rgba(249, 115, 22, 0.05), rgba(234, 88, 12, 0.05));
            border: 2px solid rgba(249, 115, 22, 0.2);
            border-radius: 12px;
            padding: 1.5rem;
        }

        /* Moving cooling wave in the hero background */
        .hero-wave-wrap {
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 90px;
            overflow: hidden;
            z-index: 0;
            pointer-events: none;
        }

        .hero-wave {
            display: block;
            width: 200%;
            height: 90px;
            animation: wave-drift 22s linear infinite;
        }

        .hero-wave.wave-back {
            animation-duration: 30s;
            animation-direction: reverse;
        }

        @keyframes wave-drift {
            from {
                transform: translateX(0);
            }

            to {
                transform: translateX(-50%);
            }
        }

        @media (prefers-reduced-motion: reduce) {
            .hero-wave {
                animation: none;
            }
        }

        .nav-link {
            color: var(--text-primary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.2s;
            text-decoration: none;
        }

        .nav-link:hover {
            color: var(--primary-blue);
        }

        .nav-menu {
            display: none;
            gap: 2rem;
            align-items: center;
        }

        @media (min-width: 768px) {
            .nav-menu {
                display: flex;
            }
        }

        .nav-burger {
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }

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

        .nav-burger span {
            display: block;
            height: 2px;
            width: 100%;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.25s ease;
        }

        .nav-burger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

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

        .nav-burger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .nav-mobile-menu {
            display: none;
            flex-direction: column;
            background: white;
            border-top: 1px solid var(--border-color);
            padding: 1rem 1.5rem 1.5rem;
        }

        .nav-mobile-menu.open {
            display: flex;
        }

        .nav-mobile-menu a {
            padding: 0.75rem 0;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-primary);
            font-weight: 500;
            text-decoration: none;
        }

        .nav-mobile-menu a:last-child {
            border-bottom: none;
        }

        @media (min-width: 768px) {
            .nav-mobile-menu {
                display: none !important;
            }
        }
    
/* Dropdown nav menus (desktop) */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-panel {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
    padding: 0.5rem;
    min-width: 220px;
    z-index: 100;
}

.nav-dropdown:hover .nav-dropdown-panel {
    display: block;
}

.nav-dropdown-panel a {
    display: block;
    padding: 0.6rem 0.9rem;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
}

.nav-dropdown-panel a:hover {
    background: var(--bg-light);
    color: var(--primary-blue);
}

/* Breadcrumb / page hero (for inner pages) */
.page-hero {
    padding: 8rem 1.5rem 3rem;
    text-align: center;
}

.page-hero h1 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
}

/* Article content styling (Resources pages) */
.article-body h2 {
    font-size: 1.75rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.article-body h3 {
    font-size: 1.25rem;
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
}

.article-body p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
}

.article-body ul {
    margin: 0 0 1.25rem 1.25rem;
    color: var(--text-secondary);
    list-style: disc;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.resource-card {
    display: block;
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

.resource-card:hover {
    border-color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
}