body {
    background-color: #121212; 
    color: #f0f0f0; 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
/* Tiêu đề chính */
#form-register h3 { 
    color: #fb44cd; 
    font-weight: 400;
    margin-bottom: 30px;
}
#form-register {
    width: 100%;
    max-width: 420px;
    
    /* Cấu hình Dark/Sleek */
    background-color: #1e1e1e; 
    padding: 35px; 
    border-radius: 15px; 
    border: 1px solid #333; 
    
    /* Hiệu ứng Glow/Shadow */
    box-shadow: 
        0 0 15px rgb(202, 40, 172), 
        0 10px 30px rgba(0, 0, 0, 0.9); 
    
    transition: all 0.3s ease;
}

#form-register:hover {
    box-shadow: 
        0 0 25px rgb(202, 40, 172), 
        0 15px 40px rgba(0, 0, 0, 1);
}
/* Input Controls */
#form-register .form-control {
    background-color: #2a2a2a; 
    border: 1px solid #444;
    color: #f0f0f0; 
    padding: 12px;
    border-radius: 8px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

#form-register .form-control::placeholder {
    color: #999; 
}

#form-register .form-control:focus {
    background-color: #333;
    border-color: #fb44cd; 
    box-shadow: 0 0 5px rgb(202, 40, 172);
    color: #fff;
}

/* Label (Nhãn) */
#form-register .form-label {
    color: #ccc;
    font-size: 0.95em;
    margin-bottom: 5px;
}

/* Customizing Bootstrap Button (Đăng Ký) */
#form-register .btn-outline-primary {
    background-color: #fb44cd; 
    color: #1a1a1a; 
    border-color: #fb44cd; 
    
    font-weight: bold;
    padding: 12px;
    transition: background-color 0.2s, border-color 0.2s;
}

#form-register .btn-outline-primary:hover {
    background-color: #fb44cd;
    border-color: #fb44cd;
    color: #1a1a1a;
    transform: translateY(-1px); 
}

/* Link Đăng Nhập (Nếu có) */
#form-register a {
    color: #fb44cd;
    text-decoration: none;
    transition: color 0.2s;
}

#form-register a:hover {
    color: #fb44cd;
    text-decoration: underline;
}