/* ===================================
   CSS Custom Properties (Variables)
   =================================== */
:root {
    /* Colors */
    --color-primary: #2d5016;
    --color-primary-light: #4a7c2c;
    --color-primary-dark: #1a3209;
    --color-secondary: #f4a460;
    --color-accent: #ff6b35;
    --color-dark: #1a1a1a;
    --color-light: #f8f9fa;
    --color-white: #ffffff;
    --color-gray-100: #f7f7f7;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-700: #495057;
    --color-gray-900: #212529;
    
    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* 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: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-index */
    --z-index-navbar: 1000;
    --z-index-overlay: 900;
    --z-index-modal: 1100;
}

/* ===================================
   Reset & Base Styles
   =================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-base);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

address {
    font-style: normal;
}

/* ===================================
   Accessibility
   =================================== */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: var(--z-index-modal);
    border-radius: var(--radius-md);
}

.skip-link:focus {
    top: var(--spacing-sm);
    left: var(--spacing-sm);
}

/* ===================================
   Utility Classes
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background-color: var(--color-gray-100);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.section-underline {
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
    margin: 0 auto var(--spacing-md);
    border-radius: var(--radius-sm);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-gray-700);
    max-width: 700px;
    margin: 0 auto;
}

.intro-text {
    font-size: 1.125rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    color: var(--color-gray-700);
    line-height: 1.8;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-index-navbar);
    transition: background-color var(--transition-base);
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    transition: opacity var(--transition-fast);
}

.navbar-brand:hover {
    opacity: 0.9;
}

.logo {
    height: 45px;
    width: auto;
    border-radius: var(--radius-sm);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-xs);
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--color-white);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.nav-menu {
    display: flex;
    gap: 0.25rem;
    list-style: none;
    align-items: center;
}

.nav-link {
    padding: var(--spacing-xs) 0.5rem;
    color: var(--color-white);
    font-weight: var(--font-weight-medium);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
    position: relative;
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--color-secondary);
    transition: transform var(--transition-base);
}

.nav-link:hover {
    color: var(--color-secondary);
}

.nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-white);
    overflow: hidden;
}

.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.3));
    z-index: -1;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: var(--spacing-2xl) var(--spacing-md);
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    margin-bottom: var(--spacing-xl);
    font-weight: var(--font-weight-light);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

/* ===================================
   About Section
   =================================== */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-md);
}

.certification {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: inline-block;
}

.cert-logo {
    max-width: 200px;
    margin: 0 auto var(--spacing-sm);
}

.cert-number {
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    font-size: 0.9rem;
}

/* ===================================
   Products Grid
   =================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.product-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-align: center;
}

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

.product-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    border-radius: 50%;
    color: var(--color-white);
    font-size: 2rem;
}

.product-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.product-card p {
    color: var(--color-gray-700);
    line-height: 1.7;
}

/* ===================================
   Sustainability & Features
   =================================== */
.sustainability-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.feature-card:hover {
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    font-size: 1.75rem;
}

.feature-card h3 {
    font-size: 1.375rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-gray-700);
    line-height: 1.7;
}

/* ===================================
   Solar Energy
   =================================== */
.solar-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.solar-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-md);
}

/* ===================================
   Integrated Farming
   =================================== */
.farming-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.farming-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
}

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

.farming-icon {
    width: 90px;
    height: 90px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
    border-radius: 50%;
    color: var(--color-white);
    font-size: 2.25rem;
}

.farming-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.farming-card p {
    color: var(--color-gray-700);
    line-height: 1.7;
}

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

.tech-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
    border-top: 4px solid var(--color-primary);
}

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

.tech-icon {
    width: 75px;
    height: 75px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-100);
    border-radius: 50%;
    color: var(--color-primary);
    font-size: 2rem;
}

.tech-card h3 {
    font-size: 1.375rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.tech-card p {
    color: var(--color-gray-700);
    line-height: 1.7;
}

/* ===================================
   Contact
   =================================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.contact-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    font-size: 1.75rem;
}

.contact-card h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.contact-card address {
    line-height: 1.8;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.contact-card p {
    color: var(--color-gray-700);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.contact-email a {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.contact-email a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

.map-container {
    margin-top: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    height: 300px;
}

.map-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer p {
    margin: 0;
    font-size: 0.9rem;
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--color-dark);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-base);
        align-items: flex-start;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--spacing-sm) 0;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .products-grid,
    .sustainability-grid,
    .farming-grid,
    .tech-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .hero {
        min-height: 70vh;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
        --spacing-3xl: 3rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .navbar,
    .nav-toggle,
    .skip-link {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
}