/* Joystick ảo nổi (tien-hiep-joystick.js). Vòng mảnh + nền mờ rất nhẹ, KHÔNG khối đặc — để cảnh vẫn xuyên qua. */
.th-joy{position:fixed;display:none;transform:translate(-50%,-50%);border-radius:50%;pointer-events:none;z-index:45;
  border:2px solid rgba(255,242,200,.55);background:radial-gradient(circle,rgba(255,242,200,.10),rgba(255,242,200,.03) 70%,rgba(255,242,200,0) 100%);
  box-shadow:0 0 10px rgba(0,0,0,.35);}
.th-joy.is-on{display:block;}
.th-joy-knob{position:absolute;left:50%;top:50%;border-radius:50%;pointer-events:none;
  border:2px solid rgba(255,230,160,.9);background:radial-gradient(circle at 40% 35%,rgba(255,244,214,.55),rgba(201,164,76,.25) 70%);
  box-shadow:0 0 8px rgba(0,0,0,.45);}