:root {
    --primary-color: #0b3c5d;
    --secondary-color: #1d2731;
    --accent-color: #328cc1;
    --light-bg: #f4f6f8;
    --text-color: #333333;
    --white: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

/* Header & Navigation */
header {
    background: var(--primary-color);
    color: var(--white);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.top-bar {
    background: var(--secondary-color);
    font-size: 0.85rem;
    padding: 6px 5%;
    display: flex;
    justify-content: flex-end;
    gap: 20px;
}

.top-bar a {
    color: var(--white);
    text-decoration: none;
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
}

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

.nav-links {
    list-style: none;
    display: flex;
    gap: 25px;
}

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

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

/* Hero Section */
.hero {
    background: linear-gradient(rgba(11, 60, 93, 0.8), rgba(11, 60, 93, 0.8)), url('https://images.unsplash.com/photo-1523050854058-8df90110c9f1?auto=format&fit=crop&w=1350&q=80') no-repeat center center/cover;
    color: var(--white);
    text-align: center;
    padding: 100px 20px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px auto;
}

.btn {
    display: inline-block;
    background: var(--accent-color);
    color: var(--white);
    padding: 12px 30px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    transition: background 0.3s;
}

.btn:hover {
    background: #2574a9;
}

/* Content Sections */
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.section-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    text-align: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.card {
    background: var(--white);
    padding: 30px;
    border-radius: 6px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* Footer */
footer {
    background: var(--secondary-color);
    color: var(--white);
    padding: 50px 5% 20px 5%;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h4 {
    margin-bottom: 15px;
    color: var(--accent-color);
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: #ccc;
    text-decoration: none;
}

.footer-section ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.9rem;
    color: #aaa;
}