:root {
    --primary-color: #0A2342;
    --secondary-color: #2CA58D;
    --background-color: #f8f9fa;
    --card-background-color: #ffffff;
    --text-color: #333;
    --heading-color: #0A2342;
    --white-color: #ffffff;
    --shadow-color: rgba(0,0,0,0.05);
    --border-color: #ccc;

    --container-width: 1140px;
    --border-radius: 8px;
    --transition-speed: 0.3s;
}

body.dark-theme {
    --primary-color: #0A2342; /* Remains the same */
    --secondary-color: #2CA58D; /* Remains the same */
    --background-color: #051424;
    --card-background-color: #081c33;
    --text-color: #c5c6c7;
    --heading-color: #ffffff;
    --shadow-color: rgba(0,0,0,0.2);
    --border-color: #2a3b4e;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.main-header {
    background-color: var(--card-background-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--heading-color);
    text-decoration: none;
}

.logo img {
    max-height: 40px;
    width: auto;
}

/* Default (light theme) logo visibility */
.logo .logo-light-theme {
    display: block;
}
.logo .logo-dark-theme {
    display: none;
}

/* Dark theme logo visibility */
.dark-theme .logo .logo-light-theme {
    display: none;
}
.dark-theme .logo .logo-dark-theme {
    display: block;
}

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

.main-nav ul {
    list-style: none;
    display: flex;
    align-items: center;
}

.main-nav ul li {
    margin-left: 25px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 400;
    transition: color var(--transition-speed);
}

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

/* Theme Switcher */
.theme-switcher {
    margin-left: 30px;
    cursor: pointer;
}
.theme-icon {
    width: 22px;
    height: 22px;
    background-color: var(--text-color);
    border-radius: 50%;
    position: relative;
    transition: all var(--transition-speed);
}
.dark-theme .theme-icon {
    background-color: var(--secondary-color);
    box-shadow: 0 0 8px var(--secondary-color);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-speed);
    display: inline-block;
}

.btn-primary {
    background-color: transparent;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white-color);
    border: 2px solid var(--secondary-color);
}

.btn-secondary:hover {
    background-color: #248b76;
    border-color: #248b76;
}

/* Hero Section */
.hero-section {
    background: var(--primary-color);
    color: var(--white-color);
    padding: 100px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 2rem auto;
    font-weight: 300;
}

/* General Section Styling */
.feature-section, .product-section, .methodology-section, .about-section, .contact-section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--heading-color);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Feature Section */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--card-background-color);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-color);
    text-align: center;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.feature-card h3 {
    color: var(--heading-color);
    margin-bottom: 1rem;
}

/* Product Section */
.product-card {
    background-color: var(--card-background-color);
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-color);
    overflow: hidden;
    display: flex;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.product-info {
    padding: 40px;
}

.product-info h3 {
    color: var(--heading-color);
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

/* Methodology Section */
.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    text-align: center;
}

.methodology-item {
    background: var(--card-background-color);
    padding: 30px;
    border-radius: var(--border-radius);
    transition: background-color var(--transition-speed);
}

.methodology-item h4 {
    color: var(--secondary-color);
    font-size: 1.5rem;
}

/* About Section */
.about-section {
    background-color: var(--card-background-color);
    transition: background-color var(--transition-speed);
}

.about-section p {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
}

/* Contact Section */
.contact-form {
    max-width: 700px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 15px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    background-color: var(--card-background-color);
    color: var(--text-color);
    transition: all var(--transition-speed);
}

.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

.contact-form button {
    width: 100%;
    padding: 15px;
    font-size: 1.1rem;
}

/* Footer */
.main-footer {
    background-color: var(--primary-color);
    color: var(--white-color);
    text-align: center;
    padding: 20px 0;
    margin-top: 60px;
}

/* Animation */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .main-nav ul {
        display: none; /* Simple solution for now, can be replaced with a hamburger menu */
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }
}