body {
  margin: 0;
  overflow: hidden;
  background-color: #000000;
  font-family: "Segoe UI", sans-serif;
}

#canvas-container {
  width: 100vw;
  height: 100vh;
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

/* UI Hướng dẫn - Nằm sát đáy */
#ui-layer {
  position: absolute;
  bottom: 20px;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: center;
  pointer-events: none; /* Để chuột xuyên qua bấm được canvas */
  z-index: 100;
}

.guide {
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  text-shadow: 0 2px 4px black;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px); /* Hiệu ứng kính mờ */
  padding: 10px 30px;
  border-radius: 50px;
  border: 1px solid rgba(255, 215, 0, 0.3);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.guide b {
  color: #ffd700; /* Màu vàng kim */
}

/* Webcam Preview - Góc phải trên */
#webcam-wrapper {
  position: absolute;
  top: 15px;
  right: 15px;
  width: 160px;
  height: 120px;
  z-index: 100;
  border: 2px solid rgba(255, 215, 0, 0.5);
  border-radius: 12px;
  overflow: hidden;
  transform: scaleX(-1); /* Soi gương */
  box-shadow: 0 0 15px rgba(255, 215, 0, 0.2);
}

#webcam-preview {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Loader */
#loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #ffd700;
  font-size: 24px;
  font-weight: bold;
  letter-spacing: 2px;
  transition: opacity 0.8s ease-out;
}

/* Con trỏ Ông Già Noel */
#hand-cursor {
  position: absolute;
  font-size: 40px;
  pointer-events: none;
  z-index: 999;
  display: none;
  transform: translate(-50%, -50%); /* Căn giữa đầu ngón tay */
  filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.8));
}