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

:root {
    --primary:   #2c3e7a;
    --accent:    #4a90d9;
    --light-bg:  #f4f6fb;
    --white:     #ffffff;
    --text:      #333333;
    --muted:     #666666;
    --border:    #dde3f0;
    --radius:    10px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 15px;
    line-height: 1.75;
    color: var(--text);
    background: var(--light-bg);
}

nav {
    background: var(--white);
    border-bottom: 2px solid var(--border);
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(44,62,122,.08);
}

.nav-brand {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links a {
    margin-left: 1.5rem;
    color: var(--primary);
    text-decoration: none;
    font-size: .92rem;
    font-weight: 500;
    transition: color .2s;
}

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

.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: var(--white);
    text-align: center;
    padding: 3rem 1.5rem 2.5rem;
}

.hero h1 { font-size: 2rem; font-weight: 700; margin-bottom: .5rem; }
.hero p  { font-size: .95rem; opacity: .85; }

main {
    max-width: 860px;
    margin: 2.5rem auto 4rem;
    padding: 0 1.5rem;
}

.card {
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 1.8rem 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(44,62,122,.05);
}

.card h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1rem;
    padding-bottom: .5rem;
    border-bottom: 2px solid var(--border);
}

.card h3 {
    font-size: .95rem;
    font-weight: 700;
    color: var(--text);
    margin: 1.1rem 0 .4rem;
}

.card p { margin-bottom: .6rem; }

.card ul {
    padding-left: 1.4rem;
    margin-bottom: .6rem;
}

.card ul li { margin-bottom: .3rem; }

.highlight {
    background: #eef4fb;
    border-left: 4px solid var(--accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: .8rem 1rem;
    margin: .8rem 0;
    font-size: .93rem;
}

footer {
    background: var(--white);
    border-top: 2px solid var(--border);
    text-align: center;
    padding: 1.2rem;
    font-size: .82rem;
    color: var(--muted);
}

footer a { 
    color: var(--accent); text-decoration: none; 
}

@media (max-width: 600px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 1.5rem; }
    .card { padding: 1.2rem 1rem; }
}