/* CSS Variables & Tokens */
:root {
    /* Colors */
    --clr-primary: #1B4D3E;
    /* Elegance Green */
    --clr-primary-light: #2A7961;
    --clr-secondary: #E3A857;
    /* Wood/Architecture Accent */
    --clr-dark: #0A0F13;
    --clr-gray-700: #334155;
    --clr-gray-400: #94A3B8;
    --clr-gray-100: #F1F5F9;
    --clr-white: #FFFFFF;

    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;

    /* Shadows & Effects */
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.3);

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--clr-gray-700);
    line-height: 1.6;
    background-color: var(--clr-white);
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
.logo {
    font-family: var(--font-heading);
    color: var(--clr-dark);
    font-weight: 800;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

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

.subtitle {
    display: inline-block;
    color: var(--clr-primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

/* Utilities */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section {
    padding: 6rem 0;
}

.bg-light {
    background-color: var(--clr-gray-100);
}

.text-center {
    text-align: center;
}

.section-desc {
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-family: var(--font-heading);
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

.btn-primary {
    background-color: var(--clr-primary);
    color: var(--clr-white);
    border-color: var(--clr-primary);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--clr-primary);
    box-shadow: 0 4px 15px rgba(27, 77, 62, 0.3);
}

.btn-outline {
    background-color: transparent;
    color: var(--clr-white);
    border-color: var(--clr-white);
}

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

.text-dark {
    color: var(--clr-dark);
    border-color: var(--clr-dark);
}

.text-dark.hover-primary:hover {
    background-color: var(--clr-primary);
    color: var(--clr-white);
    border-color: var(--clr-primary);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 0;
    z-index: 1000;
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
}

.navbar.scrolled .logo,
.navbar.scrolled .nav-links a {
    color: var(--clr-dark);
}

.navbar.scrolled .mobile-menu-btn {
    color: var(--clr-dark);
}

.navbar.scrolled .nav-cta {
    background-color: var(--clr-primary);
    color: var(--clr-white);
}

.navbar.scrolled .nav-cta:hover {
    background-color: transparent;
    color: var(--clr-primary);
}

.nav-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.75rem;
    color: var(--clr-white);
}

.logo span {
    color: var(--clr-secondary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: var(--clr-white);
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-links a:hover {
    color: var(--clr-secondary);
}

.nav-cta.btn-primary {
    background-color: var(--clr-secondary);
    border-color: var(--clr-secondary);
    color: var(--clr-dark);
}

.nav-cta.btn-primary:hover {
    background-color: transparent;
    color: var(--clr-secondary);
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--clr-white);
    cursor: pointer;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 15, 19, 0.95);
    backdrop-filter: blur(15px);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    font-size: 2rem;
    color: var(--clr-white);
    cursor: pointer;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.mobile-nav-links a {
    color: var(--clr-white);
    font-size: 1.5rem;
    font-family: var(--font-heading);
    font-weight: 600;
}

/* Hero Section */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    padding-top: 5rem;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.05);
    /* initial scale for animation */
    animation: slowZoom 20s infinite alternate linear;
}

@keyframes slowZoom {
    0% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1.15);
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(10, 15, 19, 0.9) 0%, rgba(10, 15, 19, 0.4) 100%);
}

.hero-content {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    color: var(--clr-white);
}

.hero-content h1 {
    color: var(--clr-white);
}

.hero-content h1 span {
    color: var(--clr-secondary);
}

.hero-content p {
    font-size: 1.25rem;
    max-width: 600px;
    color: var(--clr-gray-100);
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Layouts */
.layout-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

/* Glass Card */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
}

/* What is SIP Section */
.sip-features {
    list-style: none;
    margin-top: 2rem;
}

.sip-features li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-weight: 500;
    color: var(--clr-dark);
}

.sip-features li i {
    color: var(--clr-primary);
    font-size: 1.25rem;
}

.image-card {
    position: relative;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.image-card img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    display: block;
}

.floating-badge {
    position: absolute;
    background: var(--clr-white);
    padding: 0.75rem 1.25rem;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--clr-dark);
    font-family: var(--font-heading);
    animation: float 4s ease-in-out infinite;
}

.floating-badge i {
    color: var(--clr-secondary);
}

.floating-badge.top-right {
    top: 2rem;
    right: -2rem;
}

.floating-badge.bottom-left {
    bottom: 2rem;
    left: -2rem;
    animation-delay: 2s;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }

    100% {
        transform: translateY(0px);
    }
}

/* Grid Cards (Advantages) */
.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--clr-white);
    padding: 3rem 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(27, 77, 62, 0.1);
}

.icon-box {
    width: 80px;
    height: 80px;
    background: var(--clr-gray-100);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 1.5rem auto;
    font-size: 2rem;
    color: var(--clr-primary);
    transition: var(--transition-smooth);
}

.feature-card:hover .icon-box {
    background: var(--clr-primary);
    color: var(--clr-white);
    transform: scale(1.1);
}

/* Grid Models */
.grid-models {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 3rem;
}

.model-card {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

.model-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.model-image {
    position: relative;
    height: 250px;
}

.model-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.model-card:hover .model-image img {
    transform: scale(1.05);
}

.model-tags {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    z-index: 2;
}

.tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.4rem 0.75rem;
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(5px);
    color: var(--clr-dark);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    box-shadow: var(--shadow-sm);
}

.tag-solar i {
    color: #F59E0B;
}

.tag-hvac i {
    color: #3B82F6;
}

.model-content {
    padding: 2rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.model-specs {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.model-specs li {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--clr-gray-700);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.model-specs li i {
    color: var(--clr-secondary);
}

.model-content p {
    font-size: 1rem;
    margin-bottom: 2rem;
    flex: 1;
}

/* CTA Section */
.cta-section {
    background-color: var(--clr-dark);
    color: var(--clr-white);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 60%;
    height: 150%;
    background: radial-gradient(circle, rgba(42, 121, 97, 0.4) 0%, rgba(10, 15, 19, 0) 70%);
    z-index: 1;
}

.cta-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.cta-content h2 {
    color: var(--clr-white);
}

.cta-form-container {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--clr-white);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--clr-white);
    font-family: inherit;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--clr-secondary);
    background: rgba(255, 255, 255, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

/* Footer */
.footer {
    background-color: var(--clr-dark);
    color: var(--clr-gray-400);
    padding: 6rem 0 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand .logo {
    color: var(--clr-white);
    display: block;
    margin-bottom: 1rem;
}

.social-links {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--clr-white);
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: var(--clr-primary);
    transform: translateY(-3px);
}

.footer-links h4,
.footer-contact h4 {
    color: var(--clr-white);
    margin-bottom: 1.5rem;
}

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

.footer-links ul li {
    margin-bottom: 0.75rem;
}

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

.footer-contact p {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
}

/* Scroll Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    transform: translateX(-50px);
}

.reveal-right {
    transform: translateX(50px);
}

.reveal-left.active,
.reveal-right.active {
    transform: translateX(0);
}

/* Media Queries */
@media screen and (max-width: 992px) {

    .layout-grid,
    .cta-container,
    .footer-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .floating-badge.top-right {
        right: 0;
        top: 1rem;
    }

    .floating-badge.bottom-left {
        left: 0;
        bottom: 1rem;
    }
}

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

    .mobile-menu-btn {
        display: block;
    }

    h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
    }
}