body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    scroll-behavior: smooth;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    color: #fff;
}

header {
    position: fixed;
    width: 100%;
    top: 0;
    backdrop-filter: blur(10px);
    background: rgba(0,0,0,0.4);
    display: flex;
    justify-content: space-between;
    padding: 15px 30px;
    z-index: 1000;
}

nav a {
    color: #fff;
    margin: 0 10px;
    text-decoration: none;
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    width: 0%;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: #00f2fe;
    transition: 0.3s;
}

nav a:hover::after {
    width: 100%;
}

.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #00f2fe, #4facfe, #7367f0);
    text-align: center;
}

.hero h2 {
    font-size: 3rem;
}

.section {
    padding: 120px 20px;
    text-align: center;
}

.cards {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 25px;
    border-radius: 15px;
    width: 220px;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.card:hover {
    transform: translateY(-10px) scale(1.05);
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    background: linear-gradient(45deg, #00f2fe, #7367f0);
    color: white;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    transform: scale(1.1);
}

footer {
    background: rgba(0,0,0,0.5);
    text-align: center;
    padding: 20px;
}

#scrollTopBtn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: none;
    padding: 12px 16px;
    font-size: 18px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(45deg, #00f2fe, #7367f0);
    color: white;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(0,242,254,0.6);
}

#scrollTopBtn:hover {
    transform: scale(1.2);
}

/* Animaciones */
.section {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}