:root {
    --bg: #000000;
    --accent: #00bfff; /* Cyan similar al de la imagen */
    --text: #ffffff;
    --card-bg: #ffffff;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: "Helvetica Neue", Arial, sans-serif;
    margin: 0;
}

header {
    background-color: #000;
    padding: 20px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #333;
}

.logo { font-weight: bold; letter-spacing: 2px; font-size: 1.1rem; }

nav a {
    color: var(--accent);
    text-decoration: none;
    margin-left: 25px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
}

.hero {
    height: 60vh;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.8)), 
                url("https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?q=80&w=2000");
    background-size: cover;
    display: flex;
    align-items: center;
    padding: 0 8%;
    position: relative;
}

h1 {
    font-size: 8rem;
    letter-spacing: 20px;
    margin: 0;
    font-weight: 900;
}

.hero-sub {
    border-top: 5px solid var(--accent);
    width: 120px;
    margin-top: 10px;
}

.knowledge-section { background: #fff; color: #000; padding: 60px 8%; }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.card { border-bottom: 2px solid #eee; padding-bottom: 20px; }
.card img { width: 100%; height: 200px; object-fit: cover; }
.card h3 { font-size: 1.1rem; margin: 15px 0 5px; }
.card p { font-size: 0.9rem; color: #444; }
.card .date { font-size: 0.7rem; color: #888; }