html, body {
    background: radial-gradient(circle at top left, #2a2a48, #1e1e1e 80%);
    color: #fff;
    height: 100vh;
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: 'Segoe UI', Roboto, sans-serif;
}

.login-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.card {
    background: rgba(30, 30, 30, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1.2rem;
    padding: 2rem;
    box-shadow: 0 8px 25px rgba(0,0,0,0.6);
}

.card h2 {
    font-weight: 800;
    font-size: 1.6rem;
    background: linear-gradient(90deg,#6C5CE7,#00D2FF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

.form-label {
    font-weight: 600;
    color: #cfd6ff;
    font-size: 0.9rem;
}

.form-control {
    background-color: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 0.7rem;
    color: #fff;
    padding: 0.75rem 1rem;
    transition: all .3s ease;
}

.form-control:focus {
    border-color: #6C5CE7;
    background-color: rgba(255,255,255,0.12);
    box-shadow: 0 0 0 0.2rem rgba(108,92,231,0.35);
}

.btn-primary {
    background: linear-gradient(90deg,#6C5CE7,#00D2FF);
    border: none;
    font-weight: 600;
    letter-spacing: 0.3px;
    border-radius: 0.8rem;
    padding: 0.8rem;
    transition: transform .2s ease, box-shadow .2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,210,255,0.35);
}

a#linkRegistro {
    color: #00D2FF;
    text-decoration: none;
    font-weight: 600;
    transition: color .2s ease;
}

a#linkRegistro:hover {
    color: #6C5CE7;
}