body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #1C1C1C;
}
header.hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('images/cyber-bg.jpg') center/cover no-repeat;
    color: #fff;
    text-align: center;
    padding: 100px 20px;
}
nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    background: rgba(0,0,0,0.8);
    padding: 10px;
    margin: 0;
}
nav ul li {
    margin: 0 15px;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    font-family: 'Montserrat', sans-serif;
}
nav ul li a:hover {
    color: #00bcd4;
}
.hero-text h1 {
    font-size: 3em;
    font-family: 'Montserrat', sans-serif;
}
.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 24px;
    background: #00bcd4;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background 0.3s ease;
}
.btn:hover {
    background: #0097a7;
}
.alertas {
    max-width: 1200px;
    margin: auto;
    padding: 40px;
    text-align: center;
}
.cards {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
}
.card {
    background: #fff;
    padding: 20px;
    width: 300px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border-radius: 8px;
    transition: transform 0.3s ease;
}
.card:hover {
    transform: translateY(-5px);
}
.card img {
    width: 100%;
    height: auto;
    border-radius: 5px;
}
footer {
    text-align: center;
    background-color: #222;
    color: #fff;
    padding: 15px;
    margin-top: 20px;
}
form {
    display: flex;
    flex-direction: column;
    max-width: 500px;
    margin: auto;
}
form input, form textarea {
    margin-bottom: 10px;
    padding: 10px;
    font-size: 16px;
}
form button {
    background-color: #00bcd4;
    color: #fff;
    border: none;
    padding: 10px;
    cursor: pointer;
}
form button:hover {
    background-color: #0097a7;
}