/* Global Styles */
:root {
    --primary-color: #4CAF50;
    --secondary-color: #FFC107;
    --dark-color: #333;
    --light-color: #f4f4f4;
    --text-color: #333;
    --link-color: #2E7D32;
    --hover-color: #1B5E20;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

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

a:hover {
    color: var(--hover-color);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    line-height: 1.3;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

/* Header */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 15px;
}

.logo img {
    height: 60px;
}

nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 1.5rem;
}

.nav-links a {
    color: var(--dark-color);
    font-weight: 600;
    padding: 0.5rem 0;
    position: relative;
}

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

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px 0;
    background-color: var(--dark-color);
    transition: var(--transition);
}

/* Main Content */
main {
    margin-top: 100px;
}

/* Hero Section (New for industrial site) */
.hero-section {
    background-color: #f9f9f9;
    padding: 6rem 0;
    text-align: center;
}
.hero-section .container {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.hero-content {
    flex: 1;
    text-align: left;
}
.hero-video {
    flex: 1;
}
.hero-video .video-placeholder {
    background-color: #ddd;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    text-align: center;
    font-style: italic;
    color: #666;
}

/* Value Proposition Section */
.value-proposition-section {
    padding: 4rem 0;
    text-align: center;
}
.proposition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}
.proposition-card {
    background-color: #f9f9f9;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}
.proposition-card img {
    height: 80px;
    margin-bottom: 1rem;
}

/* General Sections */
.about-section, .product-features, .funding-section, .logistics-content {
    padding: 4rem 0;
}
.about-section:nth-child(odd), .product-features:nth-child(odd) {
    background-color: #f9f9f9;
}
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    align-items: center;
}
.about-image {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}
.about-image img {
    width: 100%;
}
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

/* CTA Styles & Unified Button Styles */
.cta-button, .form-submit {
    display: inline-block;
    background-color: var(--primary-color);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    margin-top: 1rem;
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
}

.cta-button:hover, .form-submit:hover {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.secondary-button {
    display: inline-block;
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition);
    margin-left: 1rem;
}
.secondary-button:hover {
    background-color: var(--primary-color);
    color: white;
}
.cta-section {
    background-color: var(--dark-color);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

/* Footer */
footer {
    background-color: #222;
    color: #fff;
    padding: 3rem 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-logo img {
    height: 50px;
    margin-bottom: 1rem;
}

.footer-links h3,
.footer-social h3 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #ccc;
}

.footer-links a:hover {
    color: white;
}

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

.social-icons a {
    color: #ccc;
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-icons a:hover {
    color: white;
    transform: translateY(-3px);
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 24px;
    cursor: pointer;
    display: none;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 1001;
}

#back-to-top:hover {
    background-color: var(--hover-color);
}


/* Responsive Styles */
@media (max-width: 992px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    .hero-section .container { flex-direction: column; text-align: center; }
    .hero-content { text-align: center; }
    .hero-video { margin-top: 2rem; }
    .hero-content .cta-button, .hero-content .secondary-button { margin-left: 0; }
    .hero-content .secondary-button { margin-top: 0.5rem; }
    .about-grid { flex-direction: column; }
    .about-image { margin-top: 2rem; }
}

@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: white;
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 2rem;
        transition: var(--transition);
        z-index: 999;
    }
    .nav-links.active { left: 0; }
    .nav-links li { margin: 1rem 0; }
    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(7px, -6px); }
}

@media (max-width: 576px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }
    h3 { font-size: 1.2rem; }
    .footer-content { grid-template-columns: 1fr; text-align: center; }
    .footer-logo { display: flex; flex-direction: column; align-items: center; }
    .social-icons { justify-content: center; }
}