:root {
    --primary-color: #0056b3; /* Deep Tech Blue */
    --secondary-color: #00a8ff; /* Bright Blue */
    --accent-color: #ffcc00; /* Gold/Yellow for highlights */
    --text-dark: #333;
    --text-light: #f8f9fa;
    --white: #ffffff;
    --bg-light: #f4f7f6;
    --card-shadow: 0 4px 6px rgba(0,0,0,0.1);
    --hover-shadow: 0 10px 20px rgba(0,0,0,0.15);
    --font-heading: 'Roboto', sans-serif;
    --font-body: 'Open Sans', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Header */
header {
    background: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 600;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0, 86, 179, 0.85), rgba(0, 40, 85, 0.9)), url('images/hero_bg.png');
    background-size: cover;
    background-position: center;
    color: var(--white);
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 2rem;
    margin-top: 60px; /* Offset for fixed header */
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 3rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hero h2 {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 2rem;
    color: var(--accent-color);
}

.hero p {
    max-width: 800px;
    font-size: 1.1rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: var(--primary-color); /* Fallback */
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 168, 255, 0.4);
}

/* Features/Menu Section */
.features {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.features h3 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
    border-top: 5px solid transparent;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--hover-shadow);
    border-top: 5px solid var(--secondary-color);
}

.icon-container {
    width: 80px;
    height: 80px;
    background: rgba(0, 168, 255, 0.1);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 1.5rem;
    transition: background 0.3s;
}

.card:hover .icon-container {
    background: var(--primary-color);
}

.card:hover .icon-container svg {
    fill: var(--white);
    stroke: var(--white);
}

.card h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.card p {
    color: #666;
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: #002855;
    color: var(--white);
    text-align: center;
    padding: 2rem;
    margin-top: auto;
}

footer p {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .nav-links {
        display: none; /* Simplify for now or add toggle */
    }
    
    .navbar {
        justify-content: center;
    }
}