/* Base Styles */
:root {
    --primary-color: #0056b3;
    --secondary-color: #f4f7f6;
    --text-dark: #333;
    --text-light: #fff;
    --accent: #00a8cc;
}

body, html {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--secondary-color);
}

h1, h2, h3 { margin-bottom: 0.5em; }

/* Navigation */
header {
    background-color: var(--text-dark);
    color: var(--text-light);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
    text-decoration: none;
}

.nav-links { list-style: none; display: flex; gap: 1.5rem; margin: 0; padding: 0; }
.nav-links a { color: var(--text-light); text-decoration: none; font-weight: 500; transition: color 0.3s;}
.nav-links a:hover { color: var(--accent); }

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0, 40, 85, 0.8), rgba(0, 40, 85, 0.9)), url('gravnet1.jpg') center/cover;
    color: var(--text-light);
    text-align: center;
    padding: 6rem 2rem;
}

.hero h1 { font-size: 3rem; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; max-width: 600px; margin: 0 auto 2rem; }

.btn {
    display: inline-block;
    background-color: var(--accent);
    color: var(--text-light);
    padding: 0.8rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: background 0.3s;
}
.btn:hover { background-color: #008ba8; }

/* Services Section */
.services { padding: 4rem 2rem; max-width: 1200px; margin: 0 auto; text-align: center; }
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border-top: 4px solid var(--primary-color);
    transition: transform 0.3s;
}
.service-card:hover { transform: translateY(-5px); }
.service-card h3 { color: var(--primary-color); }

/* About Section */
.about {
    background-color: var(--text-dark);
    color: var(--text-light);
    padding: 4rem 2rem;
    text-align: center;
}
.about-content { max-width: 800px; margin: 0 auto; }

/* Footer / Contact */
footer {
    background-color: #1a1a1a;
    color: #ccc;
    text-align: center;
    padding: 2rem;
}
.contact-info { margin-bottom: 1rem; }

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container { flex-direction: column; gap: 1rem; }
    .hero h1 { font-size: 2rem; }
}