:root {
    --primary:#0A1F44;
    --accent:#1E5EFF;
    --light:#F4F6FA;
    --text:#111827;
    --muted:#6B7280;
}

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

body {
    font-family:'Inter', sans-serif;
    color:var(--text);
    line-height:1.7;
    background:white;
}

.container {
    width:90%;
    max-width:1300px;
    margin:auto;
}

header {
    position:fixed;
    width:100%;
    background:rgba(255,255,255,0.95);
    backdrop-filter:blur(8px);
    border-bottom:1px solid #eee;
    z-index:1000;
}

nav {
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:20px 0;
}

nav ul {
    list-style:none;
    display:flex;
    gap:40px;
}

nav a {
    text-decoration:none;
    color:var(--text);
    font-weight:500;
}

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

.hero {
    height:100vh;
    background:
    linear-gradient(rgba(10,31,68,0.75),rgba(10,31,68,0.75)),
    url('https://images.unsplash.com/photo-1503387762-592deb58ef4e') center/cover no-repeat;
    display:flex;
    align-items:center;
    color:white;
}

.hero h1 {
    font-size:3.5rem;
    max-width:800px;
    line-height:1.2;
}

.hero p {
    margin-top:20px;
    max-width:600px;
    font-size:1.2rem;
}

.btn {
    display:inline-block;
    padding:16px 34px;
    margin-top:30px;
    border-radius:50px;
    text-decoration:none;
    font-weight:600;
}

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

.section {
    padding:120px 0;
}

.section-title {
    font-size:2.2rem;
    margin-bottom:20px;
}

.section-sub {
    color:var(--muted);
    max-width:600px;
    margin-bottom:60px;
}

.grid {
    display:grid;
    gap:50px;
    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
}

.card {
    padding:40px;
    border:1px solid #eee;
    transition:0.3s;
}

.card:hover {
    border-color:var(--accent);
    transform:translateY(-6px);
}

.dark {
    background:var(--primary);
    color:white;
}

.dark p { color:#d1d5db; }

footer {
    background:#0F172A;
    color:#9CA3AF;
    padding:80px 0;
}

footer a {
    color:#9CA3AF;
    text-decoration:none;
    display:block;
    margin-bottom:10px;
}

footer a:hover { color:white; }

@media(max-width:900px){
    .hero h1 { font-size:2.4rem; }
}