/* ============================================
   SEER HVAC - Main Stylesheet
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Colors - Blue HVAC Theme */
    --primary: #2E358F;
    --primary-light: #4A52A8;
    --primary-dark: #1E2460;
    --accent: #00A6ED;
    --accent-light: #33B8F1;

    /* Neutrals */
    --white: #FFFFFF;
    --background: #F4F4F4;
    --background-alt: #E8E8E8;
    --text-dark: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --border: #DDDDDD;

    /* Feedback Colors */
    --success: #28A745;
    --warning: #FFC107;
    --danger: #DC3545;

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Lato', sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Layout */
    --container-max: 1200px;
    --header-height: 80px;
}

/* ============================================
   CSS Reset
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-dark);
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-md);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-full {
    width: 100%;
}

.btn-icon {
    flex-shrink: 0;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 100;
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    transition: color var(--transition-base);
}

.logo:hover {
    color: var(--primary-light);
}

.logo-icon {
    display: flex;
    color: var(--accent);
}

/* Navigation */
.nav {
    display: none;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 600;
    color: var(--text-dark);
    padding: var(--spacing-sm) 0;
    position: relative;
    transition: color var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-base);
}

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

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

/* Header CTA */
.header-cta {
    display: none;
}

.phone-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary);
    font-weight: 700;
    font-size: 1.1rem;
    transition: color var(--transition-base);
}

.phone-link:hover {
    color: var(--accent);
}

.phone-icon {
    color: var(--accent);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 30px;
    height: 30px;
    cursor: pointer;
}

.hamburger {
    position: relative;
    width: 100%;
    height: 3px;
    background: var(--primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* Mobile Navigation */
@media (max-width: 767px) {
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav.active {
        display: block;
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-link {
        display: block;
        padding: var(--spacing-md);
        font-size: 1.1rem;
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, var(--primary) 100%);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    text-align: center;
    color: var(--white);
    padding: var(--spacing-3xl) 0;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--white);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.hero-cta .btn-primary {
    background: var(--accent);
}

.hero-cta .btn-primary:hover {
    background: var(--accent-light);
}

.hero-cta .btn-secondary {
    background: transparent;
    border-color: var(--white);
    color: var(--white);
}

.hero-cta .btn-secondary:hover {
    background: var(--white);
    color: var(--primary);
}

/* ============================================
   Section Styles
   ============================================ */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
}

/* ============================================
   Services Section
   ============================================ */
.services {
    padding: var(--spacing-3xl) 0;
    background: var(--background);
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-full);
    color: var(--white);
    margin-bottom: var(--spacing-lg);
}

.service-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.service-description {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service-link {
    display: inline-flex;
    align-items: center;
    color: var(--accent);
    font-weight: 600;
    transition: color var(--transition-base);
}

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

.service-card-highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: var(--white);
}

.service-card-highlight .service-icon {
    background: var(--white);
    color: var(--primary);
}

.service-card-highlight .service-title {
    color: var(--white);
}

.service-card-highlight .service-description {
    color: rgba(255, 255, 255, 0.9);
}

.service-card-highlight .service-link {
    color: var(--accent-light);
}

.service-card-highlight .service-link:hover {
    color: var(--white);
}

/* ============================================
   Why Choose Us Section
   ============================================ */
.why-choose-us {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

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

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 70px;
    height: 70px;
    background: var(--background);
    border-radius: var(--radius-full);
    color: var(--accent);
    margin-bottom: var(--spacing-lg);
}

.feature-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--text-light);
    line-height: 1.7;
}

/* ============================================
   Testimonials Section
   ============================================ */
.testimonials {
    padding: var(--spacing-3xl) 0;
    background: var(--background);
}

.testimonials-carousel {
    max-width: 800px;
    margin: 0 auto;
}

.testimonials-track {
    position: relative;
    overflow: hidden;
}

.testimonial-card {
    display: none;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.testimonial-card.active {
    display: block;
    animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.testimonial-stars {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.star {
    width: 24px;
    height: 24px;
    color: var(--warning);
}

.testimonial-quote {
    font-size: 1.1rem;
    font-style: italic;
    line-height: 1.8;
    color: var(--text-dark);
    margin-bottom: var(--spacing-lg);
}

.testimonial-quote::before {
    content: '"';
}

.testimonial-quote::after {
    content: '"';
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.author-name {
    font-weight: 700;
    color: var(--primary);
}

.author-location {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.testimonials-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.testimonial-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--white);
    border-radius: var(--radius-full);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.testimonial-nav-btn:hover {
    background: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.testimonials-dots {
    display: flex;
    gap: var(--spacing-sm);
}

.testimonial-dot {
    width: 12px;
    height: 12px;
    background: var(--border);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.testimonial-dot.active,
.testimonial-dot:hover {
    background: var(--primary);
    transform: scale(1.2);
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

.contact-info .section-title {
    text-align: left;
    margin-bottom: var(--spacing-md);
}

.contact-intro {
    color: var(--text-light);
    margin-bottom: var(--spacing-xl);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.contact-icon {
    flex-shrink: 0;
    color: var(--accent);
}

.contact-item strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.contact-item a {
    color: var(--primary);
    transition: color var(--transition-base);
}

.contact-item a:hover {
    color: var(--accent);
}

.service-area {
    background: var(--background);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
}

.service-area h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.service-area p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.form-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--white);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 166, 237, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-disclaimer {
    margin-top: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-logo {
    color: var(--white);
}

.footer-logo .logo-icon {
    color: var(--accent);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--spacing-md);
    max-width: 300px;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: var(--white);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

.footer-links h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

.footer-legal {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    transition: color var(--transition-base);
}

.footer-legal a:hover {
    color: var(--white);
}

/* ============================================
   Responsive Breakpoints
   ============================================ */

/* Tablet (768px+) */
@media (min-width: 768px) {
    .nav {
        display: block;
    }

    .header-cta {
        display: block;
    }

    .mobile-menu-toggle {
        display: none;
    }

    .hero-cta {
        flex-direction: row;
        justify-content: center;
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-wrapper {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }

    .form-row {
        grid-template-columns: 1fr 1fr;
    }

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

/* Large Desktop (1280px+) */
@media (min-width: 1280px) {
    :root {
        --container-max: 1320px;
    }

    .hero-content {
        padding: var(--spacing-3xl) 0 calc(var(--spacing-3xl) * 1.5);
    }
}

/* ============================================
   Animation Utilities
   ============================================ */
@media (prefers-reduced-motion: no-preference) {
    .service-card,
    .feature-card,
    .testimonial-card {
        transition: transform var(--transition-base), box-shadow var(--transition-base);
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .header,
    .hero-background,
    .testimonials-nav,
    .social-links,
    .contact-form-wrapper {
        display: none !important;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-xl) 0;
    }

    body {
        color: #000;
        background: #fff;
    }
}