:root {
    --primary-blue: #0A66C2;
    --dark-blue: #053361;
    --accent-red: #D9381E;
    --bg-dark: #12181E;
    --bg-light: #F4F7F9;
    --text-dark: #1E293B;
    --text-muted: #64748B;
    --white: #FFFFFF;
    --footer-bg: #0A0A0A;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: #FFFFFF;
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Top Contact Bar */
.top-bar {
    background-color: var(--dark-blue);
    color: var(--white);
    padding: 8px 0;
    font-size: 0.85rem;
}

.top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.top-bar a {
    color: #A5D1FF;
    text-decoration: none;
    font-weight: 600;
}

/* Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 75px;
}

.nav-logo {
    height: 48px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

.nav-toggle, .nav-toggle-label {
    display: none;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(5, 51, 97, 0.85), rgba(5, 51, 97, 0.85)), url('images/Slides.jpg') center/cover no-repeat;
    color: var(--white);
    text-align: center;
    padding: 90px 20px;
}

.hero-quote-img {
    max-width: 100%;
    height: auto;
    max-height: 140px;
    margin-bottom: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.hero-content h1 {
    font-size: 2.3rem;
    margin-bottom: 15px;
    font-weight: 800;
}

.hero-content p {
    font-size: 1.1rem;
    max-width: 750px;
    margin: 0 auto 30px;
    color: #E2E8F0;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: background 0.3s, transform 0.2s;
}

.btn-primary {
    background-color: var(--accent-red);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #B92B15;
}

.btn-secondary {
    background-color: var(--primary-blue);
    color: var(--white);
    margin-left: 10px;
}

.btn-secondary:hover {
    background-color: #084E96;
}

.btn-call {
    background-color: var(--dark-blue);
    color: var(--white);
    margin-right: 10px;
    margin-bottom: 10px;
}

.btn-block {
    width: 100%;
}

/* Sections */
.section {
    padding: 70px 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.section-title h2 {
    font-size: 2rem;
    color: var(--dark-blue);
    text-transform: uppercase;
}

.title-underline {
    width: 60px;
    height: 4px;
    background-color: var(--accent-red);
    margin: 10px auto 15px;
}

/* Services */
.services-wrapper {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    align-items: center;
}

.services-image img {
    width: 100%;
    max-width: 280px;
    display: block;
    margin: 0 auto;
}

.lead-text {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--dark-blue);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 15px;
    list-style: none;
}

.services-grid li {
    background: var(--bg-light);
    padding: 15px;
    border-left: 4px solid var(--primary-blue);
    font-weight: 600;
    border-radius: 0 4px 4px 0;
}

/* Brands Grid */
.brand-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    align-items: center;
}

.brand-card {
    background: var(--white);
    padding: 20px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    display: flex;
    justify-content: center;
    align-items: center;
}

.brand-card img {
    max-width: 100%;
    max-height: 60px;
    object-fit: contain;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.about-card {
    background: var(--white);
    padding: 30px;
    border: 1px solid #E2E8F0;
    border-radius: 6px;
}

.about-card h3 {
    color: var(--dark-blue);
    margin-bottom: 15px;
}

/* BTU Calculator */
.btu-explanation {
    max-width: 800px;
    margin: 0 auto 30px;
    text-align: center;
}

.disclaimer-box {
    background: #FFFBEB;
    border: 1px solid #FCD34D;
    padding: 15px;
    margin-top: 15px;
    font-size: 0.9rem;
    border-radius: 4px;
}

.calculator-card {
    max-width: 700px;
    margin: 0 auto;
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.form-control {
    padding: 10px;
    border: 1px solid #CBD5E1;
    border-radius: 4px;
    font-size: 1rem;
}

.results-display {
    display: none;
    margin-top: 25px;
    padding: 20px;
    background: #EFF6FF;
    border: 1px solid #BFDBFE;
    border-radius: 6px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.result-label {
    font-weight: 700;
}

.result-value {
    font-weight: 800;
    color: var(--accent-red);
}

.note-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 10px;
}

/* Contact */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.info-block {
    margin-bottom: 25px;
}

.info-block h4 {
    color: var(--dark-blue);
    margin-bottom: 8px;
}

/* Footer */
.site-footer {
    background-color: var(--footer-bg);
    color: #9CA3AF;
    padding: 50px 0 30px;
    font-size: 0.85rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: 15px;
}

.footer-col a {
    color: var(--white);
    text-decoration: underline;
}

/* Mobile Breakpoint */
@media (max-width: 768px) {
    .nav-toggle-label {
        display: block;
        cursor: pointer;
        padding: 10px;
    }

    .nav-toggle-label span,
    .nav-toggle-label span::before,
    .nav-toggle-label span::after {
        display: block;
        background: var(--dark-blue);
        height: 3px;
        width: 25px;
        position: relative;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 75px;
        left: 0;
        background: var(--white);
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    }

    .nav-toggle:checked ~ .nav-menu {
        display: flex;
    }

    .services-wrapper, .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .btn-secondary {
        margin-left: 0;
        margin-top: 10px;
    }
}