:root {
    --primary: #FACC15; /* Yellow */
    --primary-hover: #EAB308;
    --text-dark: #0F172A;
    --text-body: #475569;
    --bg-light: #F8FAFC;
    --bg-cream: #FDFBF7;
    --white: #FFFFFF;
    --border: #E2E8F0;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-cream);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
}

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

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

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1.5rem;
}

p {
    color: var(--text-body);
    margin-bottom: 1rem;
}

/* Utilities */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

.text-primary {
    color: var(--primary);
}

.w-100 {
    width: 100%;
    justify-content: center;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--text-dark);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(250, 204, 21, 0.3);
}

.btn-video {
    background: transparent;
    color: var(--white);
    padding: 0.5rem 1rem;
}

.btn-video .play-icon {
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    color: var(--text-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.5rem;
    transition: var(--transition);
}

.btn-video:hover .play-icon {
    transform: scale(1.1);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--white);
    margin-bottom: 1.5rem;
}

.badge-light {
    background: var(--white);
    color: var(--text-dark);
    border: 1px solid var(--border);
    box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
    display: inline-block;
}

/* Navbar */
.navbar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 1.5rem 0;
    transition: background-color 0.3s ease;
}

.navbar.scrolled {
    position: fixed;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
}

.logo-img {
    height: 36px;
    width: auto;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    transition: var(--transition);
}

.nav-links a {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

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

.nav-chevron {
    font-size: 0.75rem;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
    z-index: 101;
}

.hamburger span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--white);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-image: url('images/hero_bg.webp');
    background-size: cover;
    background-position: center;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(15, 23, 42, 0.9) 0%, rgba(15, 23, 42, 0.4) 100%);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-content {
    max-width: 750px;
}

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

.hero p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.hero-features {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
    color: var(--white);
    font-weight: 500;
}

.hero-features span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Video Showcase Section */
.video-showcase {
    padding: 6rem 0 2rem;
    background-color: var(--bg-cream);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    max-width: 700px;
    margin: 0 auto;
}

.video-card {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    transition: var(--transition);
    border: 8px solid var(--white);
    background-color: var(--white);
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 50px rgba(0,0,0,0.12);
}

.video-card video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    aspect-ratio: 9/16;
}

/* Why UPVC Section */
.why-upvc {
    padding: 6rem 0;
    background-color: var(--white);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.benefit-card {
    background: var(--bg-cream);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border-color: var(--primary);
}

.benefit-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(250, 204, 21, 0.1);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.benefit-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.benefit-card p {
    font-size: 0.95rem;
    margin: 0;
}

/* About Section */
.about {
    padding: 8rem 0;
    background-color: var(--bg-cream);
}

.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
}

.about-images {
    position: relative;
}

.about-img-main {
    border-radius: 24px;
    width: 85%;
    object-fit: cover;
    aspect-ratio: 4/5;
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

.about-img-sub {
    position: absolute;
    bottom: -10%;
    right: 0;
    width: 50%;
    border-radius: 20px;
    border: 8px solid var(--bg-cream);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.experience-badge {
    position: absolute;
    bottom: 20%;
    left: -10%;
    background: var(--primary);
    padding: 1.5rem;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 10px 30px rgba(250, 204, 21, 0.4);
    color: var(--text-dark);
}

.exp-icon {
    font-size: 2rem;
}

.exp-text strong {
    display: block;
    font-size: 1.5rem;
    line-height: 1;
}

.exp-text span {
    font-size: 0.875rem;
    font-weight: 500;
}

.about-desc {
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.about-features {
    list-style: none;
    margin-bottom: 2.5rem;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-weight: 500;
    color: var(--text-dark);
}

.about-stats {
    display: flex;
    gap: 3rem;
    margin-bottom: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.stat h3 {
    font-size: 2.5rem;
    margin-bottom: 0.25rem;
}

.stat p {
    margin: 0;
    font-weight: 500;
}

/* Services Section */
.services {
    padding: 6rem 0 8rem;
    background-color: var(--white);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    background: var(--bg-cream);
    padding: 3rem 2rem;
    border-radius: 20px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
    border-color: var(--primary);
}

.service-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

/* Contact Footer */
.contact-footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding-top: 6rem;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    padding-bottom: 6rem;
}

.contact-info h2 {
    color: var(--white);
}

.contact-info p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 3rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-item i {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary);
    flex-shrink: 0;
}

.contact-item h3 {
    color: var(--white);
    margin-bottom: 0.25rem;
}

.contact-item p {
    margin: 0;
}

.contact-form-wrapper {
    background: var(--white);
    padding: 3rem;
    border-radius: 20px;
    color: var(--text-dark);
}

.contact-form h3 {
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-family: inherit;
    font-size: 1rem;
    background-color: var(--bg-light);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background-color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem 0;
}

.footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    margin: 0;
    color: rgba(255, 255, 255, 0.6);
}

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

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

.social-links a:hover {
    background: var(--primary);
    color: var(--text-dark);
}

/* Responsive */
@media (max-width: 1200px) {
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .about-container {
        gap: 2rem;
    }
    .about-img-main {
        width: 100%;
    }
    .about-img-sub {
        width: 60%;
    }
}

@media (max-width: 992px) {
    /* Mobile/Tablet Nav Setup */
    .d-none-mobile {
        display: none !important;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--text-dark);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 3rem;
        z-index: 100;
        transition: right 0.4s ease;
        box-shadow: -5px 0 20px rgba(0,0,0,0.5);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links a {
        font-size: 1.5rem;
    }

    /* Layout adjustments */
    .hero-features {
        flex-direction: column;
        gap: 1rem;
    }
    
    .about-container,
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .about-images {
        margin-bottom: 4rem;
        padding-left: 2rem;
    }
    
    .experience-badge {
        left: 0;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .about-img-sub {
        bottom: -20%;
    }
    
    .contact-form-wrapper {
        padding: 2rem;
    }
    
    .footer-bottom-inner {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

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

.reveal-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s ease-out;
}

.reveal-left.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s ease-out;
}

.reveal-right.active {
    opacity: 1;
    transform: translateX(0);
}

/* Subpage Header */
.subpage-header {
    background: linear-gradient(to right, var(--text-dark), #1e293b);
    color: var(--white);
    padding: 120px 0 60px;
    text-align: center;
}

.subpage-header h1 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    margin-bottom: 1rem;
    color: var(--white);
}

.subpage-header p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Product Details */
.product-details {
    padding: 6rem 0;
    background-color: var(--white);
}

.product-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
}

.feature-item {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-cream);
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.feature-item h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.product-specs {
    position: relative;
}

.spec-card {
    background: var(--bg-cream);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    position: sticky;
    top: 100px;
}

.spec-card ul {
    list-style: none;
}

.spec-card li {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-body);
}

.spec-card li:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

/* FAQ Section */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    margin-bottom: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    text-align: left;
    padding: 1.5rem;
    background: none;
    border: none;
    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);
}

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

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease;
}

.faq-item.active .faq-question {
    color: var(--primary-hover);
    border-bottom: 1px solid var(--border);
}

.faq-item.active .faq-answer {
    padding: 1.5rem;
    max-height: 500px; /* Arbitrary large max-height for transition */
}

@media (max-width: 768px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
}