body {
    background: #f8fafc;
    font-family: 'Segoe UI', 'Arial', sans-serif;
}
.container {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
    padding: 32px 24px 24px 24px;
    margin-top: 48px;
    max-width: 420px;
}
h1 {
    color: #0d6efd;
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 10px;
}
hr {
    border: none;
    border-top: 1.5px solid #e0e6ed;
    margin: 18px 0;
}
input.form-control {
    border-radius: 6px;
    border: 1px solid #bfc9d1;
    margin-bottom: 10px;
    font-size: 1rem;
}
input.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 2px rgba(13,110,253,0.07);
}
button.btn-primary {
    background: #0d6efd;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    padding: 8px 18px;
    transition: background 0.2s;
}
button.btn-primary:hover {
    background: #0b5ed7;
}
.alert-primary {
    background: #f1f5fb;
    border: 1px solid #b6d4fe;
    color: #274472;
    border-radius: 8px;
    margin-top: 20px;
}
#mensaje {
    font-size: 1.1rem;
    font-weight: 400;
    color: #274472;
    margin: 0;
}