body {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea, #6cd3df);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Times New Roman', Times, serif;
}

.signup-card {
    background: rgba(255,255,255,0.12);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    padding: 35px;
    max-width: 450px;
    width: 100%;
    box-shadow: 0 25px 50px rgba(0,0,0,0.3);
    color: white;
}

.form-control {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
}

.form-control::placeholder {
    color: #ddd;
}

.form-control:focus {
    background: rgba(255,255,255,0.25);
    color: white;
    box-shadow: none;
}

.btn-signup {
    background: linear-gradient(135deg, #ff758c, #ff7eb3);
    border-radius: 30px;
    border: none;
    font-weight: bold;
    padding: 12px;
}

.btn-signup:hover {
    transform: scale(1.05);
}

.weak { color: #ff4d4d; }
.medium { color: #ffcc00; }
.strong { color: #00ff99; }