/* ----------------------------------------------------
   CSS Variables & Theme Setup (Eco-Industrial)
   ---------------------------------------------------- */
:root {
    /* Color Palette */
    --clr-primary-forest: #2E5C3B; /* Deep Forest Green */
    --clr-secondary-sage: #819A78; /* Muted Sage Green */
    --clr-accent-dark: #1A1A1A; /* Near Black */
    --clr-accent-grey: #4A4A4A; /* Charcoal Grey */
    --clr-neutral-light: #F4F7F4; /* Off-white / light sage tint */
    --clr-neutral-white: #FFFFFF;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Playfair Display', serif; /* Optional touch of elegance, or keep Inter */
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-fast: 0.2s ease-in-out;
    --transition-base: 0.3s ease-in-out;
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--clr-accent-dark);
    background-color: var(--clr-neutral-white);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
    margin-top: var(--header-height); /* Prevent content hiding behind sticky header */
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

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

/* ----------------------------------------------------
   Typography & Utilities
   ---------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-bottom: 1rem;
    font-weight: 700;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section-padding {
    padding: 5rem 0;
}

.text-center { text-align: center; }
.mb-4 { margin-bottom: 1.5rem; }

.bg-light-green { background-color: var(--clr-neutral-light); }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    font-weight: 600;
    border-radius: 4px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.btn-primary:hover {
    background-color: var(--clr-secondary-sage);
    border-color: var(--clr-secondary-sage);
}

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

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

/* ----------------------------------------------------
   Header & Navigation
   ---------------------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--clr-neutral-white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    transition: transform var(--transition-base);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

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

.logo-circle {
    width: 40px;
    height: 40px;
    background-color: var(--clr-primary-forest);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--clr-primary-forest);
    letter-spacing: -0.5px;
}

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

.nav-link {
    font-weight: 500;
    color: var(--clr-accent-grey);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--clr-primary-forest);
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}
.nav-link.active {
    color: var(--clr-primary-forest);
}

/* Language Toggle */
.lang-toggle {
    background: none;
    border: none;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--clr-accent-grey);
    padding: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.lang-option {
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.lang-option.active-lang {
    opacity: 1;
    color: var(--clr-primary-forest);
}

.lang-separator {
    opacity: 0.4;
}

.mobile-toggle {
    display: none; /* hidden on desktop */
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--clr-accent-dark);
    transition: var(--transition-fast);
}

/* ----------------------------------------------------
   Hero Section 
   ---------------------------------------------------- */
.hero {
    position: relative;
    height: 70vh; /* Large Industrial Hero */
    min-height: 500px;
    background-color: var(--clr-accent-dark); /* Fallback */
    /* Add multiple backgrounds or an image later */
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect width="100%" height="100%" fill="%231a1a1a"/><text x="50%" y="50%" font-family="Arial" font-size="24" fill="%234a4a4a" text-anchor="middle" dominant-baseline="middle">[Industrial Machine / Wood Cover Photo Placeholder]</text></svg>');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6); /* Darker overlay for text readability */
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: var(--clr-neutral-white);
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ----------------------------------------------------
   Corporate Identity Grid
   ---------------------------------------------------- */
.identity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.identity-card {
    background: var(--clr-neutral-white);
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border-bottom: 4px solid var(--clr-secondary-sage);
    transition: transform var(--transition-base);
}

.identity-card:hover {
    transform: translateY(-5px);
    border-bottom-color: var(--clr-primary-forest);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--clr-primary-forest);
}

.card-title {
    color: var(--clr-primary-forest);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.values-list li {
    margin-bottom: 0.5rem;
}

/* ----------------------------------------------------
   Sustainability Section
   ---------------------------------------------------- */
.sustainability-layout.row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4rem;
}

.sustainability-text {
    flex: 1;
    min-width: 300px;
}

.sustainability-image-wrapper {
    flex: 1;
    min-width: 300px;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    background-color: var(--clr-accent-grey);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--clr-neutral-white);
    border-radius: 8px;
    font-weight: bold;
}

.plantation-placeholder {
    background-color: var(--clr-secondary-sage);
}

/* ----------------------------------------------------
   Certifications Section
   ---------------------------------------------------- */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.cert-item {
    padding: 1.5rem;
    background: var(--clr-neutral-white);
    border: 1px solid var(--clr-neutral-light);
    border-radius: 8px;
}

.cert-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--clr-primary-forest);
}

/* ----------------------------------------------------
   Footer
   ---------------------------------------------------- */
.footer {
    background-color: var(--clr-accent-dark);
    color: var(--clr-neutral-white);
    padding: 4rem 0 1rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    font-weight: bold;
}

.logo-circle-small {
    width: 30px;
    height: 30px;
    background-color: var(--clr-primary-forest);
    border-radius: 50%;
}

.footer-about-text {
    color: #bbb;
    font-size: 0.95rem;
}

.footer-heading {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--clr-primary-forest);
}

.links-col ul li {
    margin-bottom: 0.8rem;
}

.links-col ul li a {
    color: #bbb;
}

.links-col ul li a:hover {
    color: var(--clr-secondary-sage);
    padding-left: 5px;
}

.footer-contact-info li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
    color: #bbb;
}

.footer-bottom {
    text-align: center;
    font-size: 0.9rem;
    color: #888;
}

/* ----------------------------------------------------
   Responsive Adjustments
   ---------------------------------------------------- */
@media (max-width: 768px) {
    .nav {
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--clr-neutral-white);
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        display: none; /* toggled via JS */
        flex-direction: column;
        padding: 2rem;
    }

    .nav.open {
        display: flex;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }

    .mobile-toggle {
        display: flex;
    }
    
    .sustainability-layout.row {
        gap: 2rem;
    }
}