/* Fundal fibra de carbon */
body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #121212;
    background-image: 
        linear-gradient(45deg, #1e1e1e 25%, transparent 25%),
        linear-gradient(-45deg, #1e1e1e 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1e1e1e 75%),
        linear-gradient(-45deg, transparent 75%, #1e1e1e 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    color: #f0f0f0;
}

/* Header */
header {
    text-align: center;
    padding: 3rem 1rem;
    background: rgba(0, 0, 0, 0.6);
    border-bottom: 1px solid #333;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    color: #ffffff;
}

header p {
    font-size: 1.2rem;
    color: #aaaaaa;
}

/* Main content */
main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

/* Cards */
.card {
    background: rgba(20, 20, 20, 0.8);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 0 10px #000;
    border: 1px solid #2a2a2a;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 20px #000;
}

.card h2 {
    margin-top: 0;
    color: #ffffff;
}

.card a {
    color: #00bfff;
    text-decoration: none;
}

.card a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
    background-color: rgba(0, 0, 0, 0.5);
    border-top: 1px solid #333;
    color: #999;
}