/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    height: 100vh;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #111;
}

.content {
    text-align: center;
    animation: fadeIn 1.2s ease-in-out;
}

h1 {
    font-size: 3em;
    font-weight: 300;
    letter-spacing: 2px;
}

.line {
    width: 50px;
    height: 2px;
    background: #111;
    margin: 20px auto;
    animation: expand 1.2s ease;
}

p {
    font-size: 1.1em;
    color: #444;
}

.sub {
    margin-top: 8px;
    font-size: 0.9em;
    color: #888;
}

/* BOTÓN ELEGANTE */
.back-btn {
    margin-top: 30px;
    padding: 10px 22px;
    border: 1px solid #111;
    background: transparent;
    color: #111;
    font-size: 0.9em;
    cursor: pointer;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: #111;
    color: #fff;
}

/* Animaciones */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes expand {
    from {
        width: 0;
        opacity: 0;
    }
    to {
        width: 50px;
        opacity: 1;
    }
}