/* Global Design Tokens */
:root {
    /* Colors */
    --color-deep-green: #1B5E20;
    --color-leaf-green: #43A047;
    --color-maize-gold: #F9A825;
    --color-soil-brown: #6D4C41;
    --color-sky-light: #E3F2FD;
    --color-white: #FFFFFF;
    --color-dark-text: #212121;
    --color-light-text: #FAFAFA;

    /* Spacing Scale */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-xxxl: 64px;
    --spacing-xxxxl: 96px;

    /* Border Radius */
    --border-radius-card: 16px;
    --border-radius-input: 8px;

    /* Shadows */
    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.08);

    /* Grid Gutters (Desktop) */
    --grid-gutter-desktop: 24px;
    /* Grid Gutters (Tablet) */
    --grid-gutter-tablet: 16px;
    /* Grid Gutters (Mobile) */
    --grid-gutter-mobile: 8px;
}

/* Base Styles & Typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif; /* Body font */
    line-height: 1.5;
    color: var(--color-dark-text);
    background-color: var(--color-white);
}

h1, h2, h3, h4 {
    font-family: 'Poppins', sans-serif; /* Headings font */
    font-weight: 700; /* Poppins Bold */
    color: var(--color-deep-green);
    line-height: 1.2;
}

/* Typography Scale */
.h1 { font-size: 48px; line-height: 56px; }
.h2 { font-size: 36px; line-height: 44px; }
.h3 { font-size: 28px; line-height: 36px; }
.h4 { font-size: 24px; line-height: 32px; } /* Custom for footer headings */
.body-text { font-size: 16px; line-height: 24px; }

/* Text utility classes */
.text-center { text-align: center; }
.light-text { color: var(--color-light-text); } /* For dark backgrounds */
.mb-64 { margin-bottom: var(--spacing-xxxl); }
.mt-48 { margin-top: var(--spacing-xxl); }

/* Section Padding */
.section-padded {
    padding: var(--spacing-xxxl) 0; /* 64px top/bottom */
}

/* Container for Grid System */
.container {
    max-width: 1200px; /* Max width for desktop content */
    margin: 0 auto;
    padding: 0 80px; /* Desktop margins */
}

/* Grid System - Defaults to 1 column for mobile, adjusts with media queries */
.grid-2-col, .grid-3-col, .grid-4-col {
    display: grid;
    gap: var(--grid-gutter-mobile);
}

/* General Link Styles */
a {
    text-decoration: none;
    color: var(--color-deep-green);
    transition: color 0.3s ease;
}
a:hover {
    color: var(--color-leaf-green);
}

/* 2. Components */

/* Navigation Bar */
.navbar {
    background-color: var(--color-white);
    padding: var(--spacing-md) 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.navbar-logo img {
    height: 40px; /* Adjust logo size */
}

.navbar-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg); /* 24px between nav links */
}

.navbar-nav a {
    font-family: 'Poppins', sans-serif;
    font-weight: 500; /* Semi-Bold equivalent for nav */
    font-size: 16px;
    color: var(--color-dark-text);
    padding: var(--spacing-sm) 0;
}
.navbar-nav a:hover {
    color: var(--color-deep-green);
}

.navbar-utility {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

/* Hamburger menu for mobile */
.hamburger-menu {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: var(--color-deep-green);
}

/* Mobile Sticky Bottom Bar */
.mobile-sticky-bar {
    display: none; /* Hidden by default, shown on mobile */
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-deep-green);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
    z-index: 999;
    padding: var(--spacing-sm) 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.mobile-sticky-bar .action-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--color-light-text);
    font-size: 12px;
    gap: var(--spacing-xs);
    text-align: center;
    padding: var(--spacing-sm);
}
.mobile-sticky-bar .action-item:hover {
    color: var(--color-maize-gold);
}


/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg); /* 16px 24px */
    border-radius: var(--border-radius-card); /* 16px */
    font-family: 'Poppins', sans-serif;
    font-weight: 600; /* Semi-Bold */
    font-size: 16px;
    line-height: 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent; /* For outline buttons */
}

/* Primary Button */
.btn-primary {
    background-color: var(--color-deep-green);
    color: var(--color-white);
}
.btn-primary:hover {
    background-color: var(--color-leaf-green);
    color: var(--color-white);
}

/* Secondary Button */
.btn-secondary {
    background-color: transparent;
    border-color: var(--color-deep-green);
    color: var(--color-deep-green);
}
.btn-secondary:hover {
    background-color: var(--color-leaf-green);
    border-color: var(--color-leaf-green);
    color: var(--color-white);
}

/* Tertiary Button (Text Link) */
.btn-tertiary {
    background: none;
    border: none;
    color: var(--color-deep-green);
    padding: 0; /* Remove button padding for text link look */
}
.btn-tertiary:hover {
    text-decoration: underline;
    color: var(--color-leaf-green);
}

/* Hero Section */
.hero-section {
    position: relative;
    background-image: url('images/hero-bg.jpg'); /* Placeholder image */
    background-size: cover;
    background-position: center;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-light-text);
    padding: var(--spacing-xxxl) 0; /* Added padding for smaller screens */
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, var(--color-deep-green) 100%);
    opacity: 0.5;
}

.hero-content {
    position: relative; /* Bring content above overlay */
    z-index: 1;
    max-width: 900px;
}

.hero-content h1 {
    color: var(--color-white); /* White text on dark background */
    margin-bottom: var(--spacing-lg);
}

.hero-content .body-text {
    color: var(--color-light-text);
    font-size: 20px; /* Slightly larger for hero sub-headline */
    margin-bottom: var(--spacing-xl);
}

.hero-ctas {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
}

/* Value Proposition Cards */
.value-propositions {
    text-align: center;
    padding: var(--spacing-xxl) 0;
}

.value-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-card);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    transition: transform 0.3s ease;
}
.value-card:hover {
    transform: translateY(-5px);
}

.value-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-sm);
}

.value-card h3 {
    color: var(--color-deep-green);
    margin-bottom: var(--spacing-xs);
}

/* Service Card */
.service-grid {
    display: grid;
    gap: var(--grid-gutter-desktop);
}

.service-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-card);
    box-shadow: var(--shadow-card);
    overflow: hidden; /* Ensures image corners are rounded with card */
    transition: transform 0.3s ease;
}
.service-card:hover {
    transform: translateY(-5px);
}

.service-image {
    width: 100%;
    height: 200px; /* 16:9 aspect ratio approximation */
    object-fit: cover;
    display: block;
}

.service-content {
    padding: var(--spacing-xl);
}

.service-content h3 {
    margin-bottom: var(--spacing-sm);
}

/* Products Carousel (basic horizontal scroll) */
.products-carousel {
    display: flex;
    gap: var(--spacing-lg);
    overflow-x: auto; /* Enable horizontal scrolling */
    padding-bottom: var(--spacing-md); /* Space for scrollbar */
    scroll-snap-type: x mandatory; /* Snap points for cards */
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
}

.product-card {
    flex: 0 0 280px; /* Fixed width for each card */
    background-color: var(--color-white);
    border-radius: var(--border-radius-card);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    scroll-snap-align: start; /* Align to start of card */
    display: flex;
    flex-direction: column;
    text-align: center;
    padding-bottom: var(--spacing-md); /* Space for button */
}

.product-image {
    width: 100%;
    height: 280px; /* 1:1 ratio */
    object-fit: cover;
    margin-bottom: var(--spacing-md);
}

.product-card h3 {
    margin-bottom: var(--spacing-xs);
    padding: 0 var(--spacing-md);
}

.product-card .body-text {
    margin-bottom: var(--spacing-md);
    flex-grow: 1; /* Push button to bottom */
    padding: 0 var(--spacing-md);
}

.product-card .btn {
    margin: 0 var(--spacing-md);
}

/* Case Study Preview */
.case-study-preview {
    display: flex;
    align-items: center;
    gap: var(--spacing-xxl); /* 48px */
    flex-wrap: wrap; /* Wrap on smaller screens */
}

.case-study-images {
    display: flex;
    gap: var(--spacing-md);
    flex: 1;
    min-width: 300px; /* Ensure images don't get too small */
    justify-content: center;
}

.case-study-img {
    width: 48%; /* Each image takes slightly less than half */
    border-radius: var(--border-radius-card);
    object-fit: cover;
    height: 250px; /* Fixed height for consistency */
    box-shadow: var(--shadow-card);
}

.case-study-content {
    flex: 1;
    min-width: 300px; /* Ensure content doesn't get too small */
}

.case-study-content h2 {
    margin-bottom: var(--spacing-lg);
}
.case-study-content .body-text {
    margin-bottom: var(--spacing-xl);
}

/* CTA Band */
.cta-band {
    background-color: var(--color-maize-gold);
    padding: var(--spacing-xxxl) 0; /* 64px */
    text-align: center;
}

.cta-band h2 {
    color: var(--color-light-text);
    margin-bottom: var(--spacing-xl);
}

/* Footer */
.footer {
    background-color: var(--color-soil-brown);
    padding: var(--spacing-xxxl) 0 var(--spacing-md);
    color: var(--color-light-text);
}

.footer .grid-3-col {
    align-items: flex-start; /* Align columns to top */
}

.footer-logo {
    height: 50px; /* Adjust logo size */
    margin-bottom: var(--spacing-md);
}

.footer-col {
    margin-bottom: var(--spacing-xl); /* Space between columns on mobile */
}

.footer-col h4 {
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}
.footer-links li {
    margin-bottom: var(--spacing-sm);
}
.footer-links a {
    color: var(--color-light-text);
}
.footer-links a:hover {
    color: var(--color-maize-gold);
}

.social-icons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}
.social-icons img {
    height: 24px;
    width: 24px;
    transition: transform 0.2s ease;
}
.social-icons img:hover {
    transform: translateY(-2px);
}

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

/* 4. Responsive Behavior */

/* Tablet (8-column, 32px margins, 16px gutters) */
@media (max-width: 1024px) {
    .container {
        padding: 0 32px; /* Tablet margins */
    }

    /* Adjust heading sizes */
    .h1 { font-size: 40px; line-height: 48px; }
    .h2 { font-size: 32px; line-height: 40px; }
    .h3 { font-size: 24px; line-height: 32px; }

    /* Grid adjustments */
    .grid-4-col {
        grid-template-columns: repeat(2, 1fr); /* 2-column for tablet */
        gap: var(--grid-gutter-tablet);
    }
    .grid-3-col {
        grid-template-columns: repeat(2, 1fr); /* 2-column for tablet */
        gap: var(--grid-gutter-tablet);
    }

    /* Hero section */
    .hero-content .body-text {
        font-size: 18px;
    }

    /* Product carousel - make cards slightly smaller if needed, or adjust flex-basis */
    .product-card {
        flex: 0 0 240px;
    }

    /* Case Study Images - stack them */
    .case-study-preview {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    .case-study-images {
        flex-direction: row;
        width: 100%;
    }
    .case-study-img {
        width: 49%; /* Keep side-by-side but perhaps narrower */
        height: 200px;
    }

    /* Footer column stacking */
    .footer .grid-3-col {
        grid-template-columns: repeat(2, 1fr); /* 2-column footer on tablet */
    }
    .footer-col:last-child {
        grid-column: span 2; /* Last column spans full width */
    }
}

/* Mobile (4-column, 16px margins, 8px gutters) */
@media (max-width: 768px) {
    .container {
        padding: 0 16px; /* Mobile margins */
    }

    /* Adjust heading sizes for smaller screens */
    .h1 { font-size: 32px; line-height: 40px; }
    .h2 { font-size: 28px; line-height: 36px; }
    .h3 { font-size: 22px; line-height: 30px; }
    .body-text { font-size: 15px; line-height: 22px; }

    /* Navbar mobile adjustments */
    .navbar-nav {
        display: none; /* Hide desktop nav */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--color-white);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        padding: var(--spacing-md) 0;
        flex-direction: column; /* Stack nav items */
        align-items: center;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }
    .navbar-nav.active {
        display: flex; /* Show when active */
        opacity: 1;
        visibility: visible;
    }
    .navbar-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }
    .navbar-nav li {
        text-align: center;
        width: 100%;
    }
    .navbar-nav a {
        padding: var(--spacing-md) 0;
        display: block;
    }

    .navbar-utility .hidden-mobile {
        display: none; /* Hide desktop utility buttons */
    }
    .hamburger-menu {
        display: block; /* Show hamburger */
    }

    .mobile-sticky-bar {
        display: flex; /* Show sticky bar */
    }

    /* Collapse grids to 1 column */
    .grid-4-col, .grid-3-col {
        grid-template-columns: 1fr;
        gap: var(--grid-gutter-mobile);
    }

    /* Hero CTAs stack vertically */
    .hero-ctas {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    .hero-ctas .btn {
        width: 100%; /* Full width buttons */
    }

    /* Product cards adjust for smaller screens */
    .products-carousel {
        padding: 0 var(--spacing-md) var(--spacing-md); /* Add horizontal padding to carousel container */
    }
    .product-card {
        flex: 0 0 260px; /* Slightly larger for single view */
    }

    /* Case Study Images - stack them */
    .case-study-images {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-md);
    }
    .case-study-img {
        width: 100%;
        height: 200px;
    }

    /* Footer columns stack */
    .footer .grid-3-col {
        grid-template-columns: 1fr;
    }
    .footer-col:last-child {
        grid-column: span 1; /* Reset span */
    }
}