/* Base Reset & Global Styles */
:root {
    /* Colors */
    --color-primary-dark: #000000; /* Absolute Black */
    --color-secondary-light: #FFFFFF; /* Pure White */
    --color-accent-blue: #007BFF; /* Vibrant Electric Blue */
    --color-text-body: #333333; /* Charcoal Gray for body text on light backgrounds */
    --color-text-light: #E0E0E0; /* Light Gray for text on dark backgrounds */
    --color-bg-light: #F5F7FA; /* Very light blue-gray for subtle contrast */
    --color-border: #E0E0E0; /* Light gray border */

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --font-size-base: 1rem; /* 16px */

    /* Spacing Scale (8pt grid) */
    --space-xxs: 4px;
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 64px;
    --space-xxxl: 96px;

    /* Border Radii */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-circle: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-accent: 0 8px 20px rgba(0, 123, 255, 0.2); /* Blue accent shadow */
}

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-body);
    background-color: var(--color-secondary-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.no-scroll {
    overflow: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-primary-dark);
    line-height: 1.2;
    margin-top: 0;
    margin-bottom: var(--space-md);
    font-weight: 700;
}

h1 { font-size: clamp(2.5rem, 6vw + 1rem, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw + 1rem, 3.5rem); }
h3 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem); }

a {
    text-decoration: none;
    color: var(--color-accent-blue);
    transition: color 0.3s ease;
}

a:hover, a:focus {
    color: var(--color-primary-dark);
}

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

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

p {
    margin-bottom: var(--space-sm);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section-padding {
    padding: clamp(var(--space-xl), 10vw, var(--space-xxxl)) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-xl);
    font-weight: 700;
}

.section-description {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-xl);
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-body);
}

.text-center { text-align: center; }
.margin-top-xl { margin-top: var(--space-xl); }
.max-w-lg { max-width: 800px; margin-left: auto; margin-right: auto; }

/* Buttons */
.btn {
    display: inline-flex; /* Use flex to vertically align content */
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-transform: uppercase;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    min-height: 48px; /* Ensure tap target size */
}

.btn-primary {
    background-color: var(--color-accent-blue);
    color: var(--color-secondary-light);
    border-color: var(--color-accent-blue);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-secondary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
}

.btn-secondary:hover, .btn-secondary:focus {
    background-color: var(--color-accent-blue);
    color: var(--color-secondary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.btn-small {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.9rem;
    min-height: 40px;
}

.btn-lg {
    padding: var(--space-md) var(--space-xxl);
    font-size: 1.1rem;
    min-height: 56px;
}

/* Backgrounds & Text Colors */
.bg-light { background-color: var(--color-bg-light); }
.bg-dark { background-color: var(--color-primary-dark); }
.text-light { color: var(--color-text-light); }
.color-accent { color: var(--color-accent-blue); }

/* Icons */
.icon-lg {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--space-md);
    display: inline-block;
}

/* Header */
.site-header {
    background-color: var(--color-primary-dark);
    padding: var(--space-sm) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, padding 0.3s ease;
}

.site-header.is-scrolled {
    padding: var(--space-xs) 0;
    background-color: rgba(0, 0, 0, 0.95);
    box-shadow: var(--shadow-lg);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 3vw + 0.5rem, 2rem);
    font-weight: 700;
    color: var(--color-accent-blue);
    letter-spacing: -1px;
    transition: color 0.3s ease;
}

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

.main-nav ul {
    display: flex;
    gap: var(--space-lg);
}

.main-nav a {
    color: var(--color-text-light);
    font-weight: 500;
    font-size: var(--font-size-base);
    position: relative;
    padding-bottom: var(--space-xxs);
}

.main-nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-blue);
    transition: width 0.3s ease;
}

.main-nav a:hover::after, .main-nav a:focus::after {
    width: 100%;
}

.nav-toggle {
    display: none; /* Hidden by default, shown on mobile */
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    position: relative;
    z-index: 1001; /* Above nav menu */
    min-height: 44px;
    min-width: 44px;
}

.nav-toggle span {
    display: block;
    width: var(--space-lg);
    height: 3px;
    background-color: var(--color-text-light);
    margin: var(--space-xxs) 0;
    transition: all 0.3s ease;
    border-radius: var(--radius-sm);
}

/* Hero Section */
.hero-section {
    background-color: var(--color-primary-dark);
    color: var(--color-text-light);
    padding: clamp(var(--space-xxl), 15vw, 150px) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.1) 0%, rgba(0, 0, 0, 0.9) 70%);
    z-index: 1;
}

.hero-content-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 2;
    gap: var(--space-xl);
}

.hero-content {
    flex: 1;
    max-width: 55%;
}

.hero-content h1 {
    color: var(--color-secondary-light);
    margin-bottom: var(--space-md);
}

.hero-content p {
    font-size: clamp(1.1rem, 2vw + 0.5rem, 1.5rem);
    line-height: 1.6;
    margin-bottom: var(--space-xl);
    color: var(--color-text-light);
}

.hero-actions .btn {
    margin-right: var(--space-md);
    margin-bottom: var(--space-sm);
}

.hero-image {
    flex: 1;
    max-width: 45%;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: translateY(20px);
    opacity: 0;
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.hero-image.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.hero-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-accent);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.category-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-secondary-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--color-border);
    transform: translateY(20px);
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.category-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

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

.category-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid var(--color-border);
}

.category-card h3 {
    margin-top: var(--space-md);
    margin-bottom: var(--space-xxs);
    color: var(--color-primary-dark);
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
}

.category-card p {
    font-size: 0.95rem;
    color: var(--color-text-body);
    margin-bottom: var(--space-md);
    padding: 0 var(--space-sm);
}

/* Product Grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
}

.product-card {
    background-color: var(--color-secondary-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transform: translateY(20px);
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.product-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

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

.product-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--color-border);
}

.product-info {
    padding: var(--space-md);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.product-info h3 {
    font-size: clamp(1.1rem, 2.2vw, 1.6rem);
    min-height: 48px; /* Consistent height for titles */
    margin-bottom: var(--space-xs);
}

.product-price {
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    font-weight: 700;
    color: var(--color-accent-blue);
    margin-bottom: var(--space-md);
}

/* Solutions Section */
.solutions-section .section-title,
.solutions-section .section-description {
    color: var(--color-text-light);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.solution-item {
    background-color: rgba(255, 255, 255, 0.08); /* White with transparency */
    border-radius: var(--radius-lg);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    border: 1px solid rgba(0, 123, 255, 0.3); /* Accent blue border */
    box-shadow: var(--shadow-md);
    transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    transform: translateY(20px);
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.solution-item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.solution-item:hover {
    background-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-8px);
    box-shadow: var(--shadow-accent);
}

.solution-item h3 {
    color: var(--color-secondary-light);
    margin-bottom: var(--space-xs);
    font-size: clamp(1.3rem, 2.8vw, 2rem);
}

.solution-item p {
    font-size: 1.05rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* Testimonials Section */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.testimonial-card {
    background-color: var(--color-secondary-light);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: left;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--color-border);
    transform: translateY(20px);
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.testimonial-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

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

.testimonial-quote {
    font-style: italic;
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--color-text-body);
    margin-bottom: var(--space-md);
}

.customer-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: auto; /* Pushes to bottom */
}

.customer-info img {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-circle);
    object-fit: cover;
    border: 3px solid var(--color-accent-blue);
    flex-shrink: 0;
}

.customer-details h4 {
    font-size: 1.1rem;
    margin: 0;
    color: var(--color-primary-dark);
}

.customer-details span {
    font-size: 0.9rem;
    color: #666;
}

/* FAQ Section (Accordion) */
.accordion {
    max-width: 800px;
    margin: var(--space-xl) auto 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--color-border);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-secondary-light);
    border: none;
    text-align: left;
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 60px; /* Ensure tap target size */
}

.accordion-header:hover, .accordion-header:focus {
    background-color: var(--color-bg-light);
    color: var(--color-accent-blue);
}

.accordion-icon {
    transition: transform 0.3s ease;
}

.accordion-item[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.4s ease-out;
    background-color: var(--color-bg-light);
    padding: 0 var(--space-lg);
}

.accordion-item[aria-expanded="true"] .accordion-content {
    max-height: 200px; /* Arbitrary large enough value */
    padding: var(--space-sm) var(--space-lg) var(--space-md);
}

.accordion-content p {
    margin-bottom: 0;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text-body);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, rgba(0, 123, 255, 0.8) 100%);
    color: var(--color-secondary-light);
    text-align: center;
}

.cta-section .section-title {
    color: var(--color-secondary-light);
}

.cta-section .section-description {
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
}

/* Footer */
.site-footer {
    background-color: var(--color-primary-dark);
    color: var(--color-text-light);
    padding: clamp(var(--space-xl), 8vw, var(--space-xxl)) 0 var(--space-md);
    font-size: 0.95rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.footer-col h3 {
    font-size: 1.3rem;
    color: var(--color-accent-blue);
    margin-bottom: var(--space-md);
    position: relative;
    padding-bottom: var(--space-xs);
}

.footer-col h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background-color: var(--color-accent-blue);
}

.footer-about .logo {
    margin-bottom: var(--space-sm);
}

.footer-col ul li {
    margin-bottom: var(--space-xs);
}

.footer-col ul li a {
    color: var(--color-text-light);
    transition: color 0.3s ease;
    display: inline-block; /* Ensure padding/margin works */
}

.footer-col ul li a:hover {
    color: var(--color-accent-blue);
    transform: translateX(5px);
}

.footer-col p {
    margin-bottom: var(--space-xxs);
    line-height: 1.5;
}

.footer-col p .fas {
    margin-right: var(--space-xs);
    color: var(--color-accent-blue);
}

.social-links {
    margin-top: var(--space-md);
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-accent-blue);
    color: var(--color-secondary-light);
    border-radius: var(--radius-circle);
    margin-right: var(--space-xs);
    transition: background-color 0.3s ease, color 0.3s ease;
    font-size: 1.1rem;
}

.social-links a:hover {
    background-color: var(--color-secondary-light);
    color: var(--color-accent-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
    margin-top: var(--space-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #999;
    font-size: 0.85rem;
}


/* Responsive Design */
@media (max-width: 992px) {
    .main-nav { display: none; }
    .nav-toggle { display: block; }

    .main-nav.is-active {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: var(--color-primary-dark);
        padding-top: 100px; /* Space for header */
        align-items: center;
        justify-content: center;
        z-index: 999;
        overflow-y: auto;
    }

    .main-nav.is-active ul {
        flex-direction: column;
        gap: var(--space-lg);
        text-align: center;
    }

    .main-nav.is-active a {
        font-size: 1.5rem;
        padding: var(--space-sm) 0;
    }

    .hero-content-wrapper {
        flex-direction: column;
        text-align: center;
    }

    .hero-content, .hero-image {
        max-width: 100%;
    }

    .hero-content {
        margin-bottom: var(--space-xl);
    }

    .hero-actions .btn {
        margin-right: var(--space-sm);
        margin-left: var(--space-sm);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-col h3::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .social-links {
        justify-content: center;
        display: flex;
    }
}

@media (max-width: 768px) {
    .site-header {
        padding: var(--space-xs) 0;
    }
    .header-inner {
        padding: 0 var(--space-sm);
    }
    .hero-section {
        padding: clamp(var(--space-xxl), 10vw, 100px) 0;
    }

    .hero-content h1 {
        font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
    }
    .hero-content p {
        font-size: clamp(1rem, 2vw + 0.5rem, 1.2rem);
    }

    .section-title {
        font-size: clamp(1.8rem, 4vw + 1rem, 2.8rem);
    }

    .category-grid, .product-grid, .solutions-grid, .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions .btn {
        width: calc(100% - var(--space-md) * 2);
        margin-right: var(--space-sm);
        margin-left: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .hero-content h1 {
        font-size: clamp(1.8rem, 4.5vw + 1rem, 3rem);
    }
    .hero-content p {
        font-size: 1rem;
    }
    .hero-actions {
        display: flex;
        flex-direction: column;
        gap: var(--space-sm);
    }
    .hero-actions .btn {
        margin: 0;
        width: 100%;
    }
    .accordion-header {
        font-size: 1rem;
        padding: var(--space-sm);
        min-height: 50px;
    }
    .accordion-content {
        padding: 0 var(--space-sm);
    }
    .accordion-item[aria-expanded="true"] .accordion-content {
        padding: var(--space-sm) var(--space-sm) var(--space-md);
    }
}