/*========== RESETEO Y BASE ==========*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: radial-gradient(circle at top, #2d2d2d 0%, #1a1a1a 100%);
    color: #e0e0e0;
    line-height: 1.6;
    padding-top: 80px;
    overflow-x: hidden;
}

/*========== NAVEGACIÓN MODERNA ==========*/
nav {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    background: rgba(30, 30, 30, 0.8);
    backdrop-filter: blur(15px); /* Efecto cristal */
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-link {
    color: #aaa;
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: 0.3s;
}

.nav-link:hover, .nav-link.active {
    color: #4db8ff;
    text-shadow: 0 0 10px rgba(77, 184, 255, 0.5);
}

/*========== HERO SECTION ==========*/
.hero {
    text-align: center;
    padding: 60px 20px;
    animation: fadeIn 1.2s ease-out;
}

h1 {
    font-size: clamp(2.5em, 8vw, 4em); /* Se adapta al tamaño de pantalla */
    color: #fff;
    margin-bottom: 10px;
    text-transform: uppercase;
    background: linear-gradient(to right, #fff, #4db8ff);
    background-clip: border-box;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-style: italic;
    color: #888;
    margin-top: -10px;
}

/*========== CONTENEDOR Y TARJETAS ==========*/
.contenedor-principal {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

.presentacion p {
    font-size: 1.25em;
    text-align: center;
    margin-bottom: 40px;
}

h2 {
    color: #fff;
    text-align: center;
    margin-bottom: 25px;
    font-size: 2em;
}

.tarjeta-info {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    transition: transform 0.3s ease;
}

.tarjeta-info:hover {
    transform: translateY(-5px);
    border-color: rgba(77, 184, 255, 0.4);
}

/*========== BOTÓN DE ACCIÓN ==========*/
.cta {
    text-align: center;
    margin-top: 50px;
    padding-bottom: 60px;
}

.boton-principal {
    display: inline-block;
    background: #4db8ff;
    color: #1a1a1a;
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    box-shadow: 0 10px 20px rgba(77, 184, 255, 0.2);
    transition: 0.3s;
}

.boton-principal:hover {
    transform: scale(1.05);
    background: #fff;
    box-shadow: 0 15px 30px rgba(77, 184, 255, 0.4);
}

/*========== FOOTER ==========*/
footer {
    text-align: center;
    padding: 60px 20px;
    color: #555;
    font-size: 0.9rem;
}

/*========== ANIMACIÓN ==========*/
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}