/* ========================================
   HVAC Website - Professional Design System
   ======================================== */

/* === IMPORTS === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* === CSS VARIABLES === */
:root {
    /* Color Palette - Cool & Warm Theme */
    --primary-cool: #0EA5E9;
    --primary-cool-light: #38BDF8;
    --primary-cool-dark: #0284C7;
    --primary-warm: #F97316;
    --primary-warm-light: #FB923C;
    --primary-warm-dark: #EA580C;

    /* Neutral Colors */
    --dark-bg: #0F172A;
    --dark-surface: #1E293B;
    --dark-surface-light: #334155;
    --light-bg: #F8FAFC;
    --light-surface: #FFFFFF;
    --text-dark: #0F172A;
    --text-light: #F8FAFC;
    --text-muted: #64748B;

    /* Gradient Backgrounds */
    --gradient-hero: linear-gradient(135deg, #0EA5E9 0%, #F97316 100%);
    --gradient-cool: linear-gradient(135deg, #0EA5E9 0%, #38BDF8 100%);
    --gradient-warm: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
    --gradient-dark: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);

    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    --shadow-glow-cool: 0 0 30px rgba(14, 165, 233, 0.3);
    --shadow-glow-warm: 0 0 30px rgba(249, 115, 22, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
    overflow-x: hidden;
}

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-muted);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

/* === NAVIGATION === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    width: auto;
    transition: var(--transition-base);
}

.logo img:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-dark);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--spacing-3xl) var(--spacing-md);
    background: var(--gradient-dark);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('hero-bg.png');
    background-size: cover;
    background-position: center;
    opacity: 0.4;
    z-index: 0;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease-out;
}

.hero h1 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero p {
    color: rgba(248, 250, 252, 0.9);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-badges {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.badge {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* === BUTTONS === */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-family: var(--font-heading);
    text-align: center;
    cursor: pointer;
    border: none;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-hero);
    color: var(--text-light);
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), var(--shadow-glow-cool);
}

.btn-secondary {
    background: var(--light-surface);
    color: var(--text-dark);
    border: 2px solid var(--primary-cool);
}

.btn-secondary:hover {
    background: var(--primary-cool);
    color: var(--text-light);
    transform: translateY(-2px);
}

.btn-emergency {
    background: var(--gradient-warm);
    color: var(--text-light);
    box-shadow: var(--shadow-lg);
    animation: pulse 2s infinite;
}

.btn-emergency:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), var(--shadow-glow-warm);
}

/* === SECTIONS === */
.section {
    padding: var(--spacing-3xl) var(--spacing-md);
    position: relative;
}

.section-dark {
    background: var(--gradient-dark);
    color: var(--text-light);
}

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

.section-accent {
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.05) 0%, rgba(249, 115, 22, 0.05) 100%);
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.8s ease-out;
}

.section-header h2 {
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-hero);
    border-radius: 2px;
}

.section-dark .section-header h2 {
    color: var(--text-light);
}

.section-dark .section-header p {
    color: rgba(248, 250, 252, 0.8);
}

/* === CARDS === */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.card {
    background: var(--light-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-hero);
    transform: scaleX(0);
    transition: var(--transition-base);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card:hover::before {
    transform: scaleX(1);
}

.card-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    transition: var(--transition-base);
}

.card-icon.cool {
    background: var(--gradient-cool);
    box-shadow: var(--shadow-glow-cool);
}

.card-icon.warm {
    background: var(--gradient-warm);
    box-shadow: var(--shadow-glow-warm);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
}

.card h3 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--text-muted);
    line-height: 1.7;
}

.card-glass h3 {
    color: var(--text-light);
}

.card-glass p {
    color: rgba(248, 250, 252, 0.8);
}

/* === FEATURES === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-lg);
    transition: var(--transition-base);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    background: var(--gradient-hero);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
}

.feature-item:hover .feature-icon {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl), var(--shadow-glow-cool);
}

/* === TESTIMONIALS === */
.testimonial-card {
    background: var(--light-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    position: relative;
    margin-top: var(--spacing-lg);
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: -20px;
    left: 20px;
    font-size: 6rem;
    font-family: Georgia, serif;
    color: var(--primary-cool);
    opacity: 0.2;
}

.testimonial-text {
    font-style: italic;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-hero);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-weight: 700;
    font-size: 1.25rem;
}

.author-info h4 {
    margin: 0;
    color: var(--text-dark);
    font-size: 1rem;
}

.author-info p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.star-rating {
    color: #FCD34D;
    margin-bottom: var(--spacing-sm);
}

/* === FORMS === */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid #E2E8F0;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition-base);
    background: var(--light-surface);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-cool);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

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

/* === FOOTER === */
.footer {
    background: var(--gradient-dark);
    color: var(--text-light);
    padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-md);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
    color: rgba(248, 250, 252, 0.8);
    line-height: 1.8;
}

.footer-section a:hover {
    color: var(--primary-cool-light);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(248, 250, 252, 0.6);
}

/* === FAQ ACCORDION === */
.faq-item {
    background: var(--light-surface);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-md);
    background: none;
    border: none;
    text-align: left;
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-base);
}

.faq-question:hover {
    color: var(--primary-cool);
}

.faq-icon {
    font-size: 1.5rem;
    transition: var(--transition-base);
    color: var(--primary-cool);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.faq-answer-content {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-muted);
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

/* === EMERGENCY CALLOUT === */
.emergency-callout {
    background: var(--gradient-warm);
    color: var(--text-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl), var(--shadow-glow-warm);
    position: relative;
    overflow: hidden;
}

.emergency-callout::before {
    content: '⚡';
    position: absolute;
    font-size: 15rem;
    opacity: 0.1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.emergency-callout h3 {
    color: var(--text-light);
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.emergency-callout p {
    color: rgba(248, 250, 252, 0.95);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.emergency-phone {
    font-size: 2.5rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--text-light);
    margin: var(--spacing-md) 0;
    display: block;
}

/* === ANIMATIONS === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.fade-in {
    animation: fadeInUp 0.8s ease-out;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--light-surface);
        width: 100%;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
    }

    .nav-links.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
        min-height: 80vh;
    }

    .section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .card-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }

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

/* === UTILITY CLASSES === */
.text-center {
    text-align: center;
}

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

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mt-4 {
    margin-top: var(--spacing-xl);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

.mb-4 {
    margin-bottom: var(--spacing-xl);
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.gap-1 {
    gap: var(--spacing-sm);
}

.gap-2 {
    gap: var(--spacing-md);
}

.gap-3 {
    gap: var(--spacing-lg);
}