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

body {
background:#f4f6f9;
color:#333;
line-height:1.6;
}

.container {
width:90%;
max-width:1200px;
margin:auto;
}

header {
background:#0b1f3a;
padding:15px 0;
position:sticky;
top:0;
z-index:1000;
}

.nav {
display:flex;
justify-content:space-between;
align-items:center;
}

nav a {
color:white;
margin-left:20px;
text-decoration:none;
font-weight:500;
}

nav a:hover {
color:#ff7a00;
}

.logo {
height:45px;
}

.hero {
background:linear-gradient(rgba(0,0,0,0.7),rgba(0,0,0,0.7)),
url('https://images.unsplash.com/photo-1581090700227-1e8b2b24b7f5') center/cover;
color:white;
text-align:center;
padding:120px 20px;
}

.hero h1 {
font-size:42px;
margin-bottom:20px;
}

.btn-primary {
background:#ff7a00;
color:white;
padding:12px 25px;
border-radius:5px;
text-decoration:none;
font-weight:bold;
}

.section {
padding:70px 0;
text-align:center;
}

.section h2 {
margin-bottom:40px;
color:#0b1f3a;
}

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

.card {
background:white;
padding:30px;
border-radius:10px;
box-shadow:0 5px 15px rgba(0,0,0,0.08);
transition:0.3s;
}

.card:hover {
transform:translateY(-8px);
}

.dark {
background:#0b1f3a;
color:white;
}

footer {
background:#111;
color:white;
text-align:center;
padding:20px;
}

.whatsapp {
position:fixed;
bottom:20px;
right:20px;
background:#25D366;
color:white;
font-size:28px;
padding:15px 18px;
border-radius:50%;
text-decoration:none;
box-shadow:0 5px 15px rgba(0,0,0,0.3);
}