* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #000;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  user-select: none;
}

/* Canvas AR phủ toàn màn hình */
#camerafeed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  display: block;
}

/* Ẩn watermark powered by 8thwall trên toàn trang */
.poweredby-img, [class*="poweredby"], [id*="powered-by"] {
  display: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
}

/* Giao diện HUD hướng dẫn */
#ar-hud {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  pointer-events: none;
  padding: 0 16px;
}

.hud-box {
  width: 100%;
  max-width: 440px;
  background: rgba(15, 20, 35, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(0, 240, 255, 0.4);
  border-radius: 18px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8), 0 0 20px rgba(0, 240, 255, 0.15);
  pointer-events: auto;
  transition: all 0.3s ease;
}

.hud-indicator {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffb703;
  box-shadow: 0 0 12px #ffb703;
  flex-shrink: 0;
  animation: pulse-dot 1.5s infinite ease-in-out;
  transition: all 0.3s ease;
}

.hud-indicator.found {
  background: #00f0ff;
  box-shadow: 0 0 14px #00f0ff, 0 0 25px #00f0ff;
}

.hud-indicator.lost {
  background: #fb8500;
  box-shadow: 0 0 12px #fb8500;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
}

.hud-info {
  flex: 1;
}

.hud-title {
  font-size: 14px;
  font-weight: 800;
  color: #00f0ff;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hud-desc {
  font-size: 12px;
  color: #d0e0ff;
  margin-top: 3px;
  opacity: 0.9;
  line-height: 1.3;
}

/* Các nút bấm thao tác */
.hud-actions {
  display: flex;
  gap: 10px;
  pointer-events: auto;
}

.hud-btn {
  padding: 10px 18px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  outline: none;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: transform 0.2s, background 0.2s;
}

.hud-btn:active {
  transform: scale(0.95);
}

.glow-btn {
  background: linear-gradient(135deg, #00f0ff, #7000ff);
  color: #fff;
  box-shadow: 0 4px 15px rgba(0, 240, 255, 0.4);
}

.glass-btn {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Modal xem ảnh mẫu */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 100000;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.modal-card {
  background: #111728;
  border: 1px solid rgba(0, 240, 255, 0.5);
  border-radius: 20px;
  width: 100%;
  max-width: 380px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.9);
}

.modal-header {
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-header h3 {
  font-size: 15px;
  color: #00f0ff;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
}

.modal-body {
  padding: 18px;
  text-align: center;
}

.modal-body p {
  font-size: 13px;
  color: #d0e0ff;
  margin-bottom: 14px;
  line-height: 1.4;
}

.modal-img {
  width: 100%;
  max-height: 280px;
  object-fit: contain;
  border-radius: 12px;
  border: 2px solid rgba(0, 240, 255, 0.4);
  background: #000;
}

.camel-btn {
  background: linear-gradient(135deg, #ff9900, #ff5500);
  color: #fff;
  box-shadow: 0 4px 15px rgba(255, 153, 0, 0.4);
}
.camel-btn.walking {
  background: linear-gradient(135deg, #ff3366, #cc0033);
  box-shadow: 0 4px 15px rgba(255, 51, 102, 0.5);
}


/* Video ngầm gắn vào viewport để đảm bảo Mobile Safari và Chrome cho phép autoplay */
#ar-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 320px;
  height: 240px;
  opacity: 1;
  pointer-events: none;
  z-index: -1;
}


/* Giao diện thanh công cụ Cờ vua AR */
#chess-hud {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 440px;
  background: rgba(13, 21, 37, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(0, 240, 255, 0.5);
  border-radius: 18px;
  padding: 10px 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8), 0 0 20px rgba(0, 240, 255, 0.2);
  pointer-events: auto; /* Cực kỳ quan trọng: Cho phép click/touch toàn bộ thanh cờ vua */
  user-select: none;
  -webkit-user-select: none;
}

.chess-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.chess-title {
  font-size: 13px;
  font-weight: 800;
  color: #00f0ff;
  letter-spacing: 0.5px;
}

.diff-selector {
  display: flex;
  gap: 4px;
  background: rgba(255, 255, 255, 0.1);
  padding: 3px;
  border-radius: 20px;
}

.diff-btn {
  padding: 5px 14px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  color: #ccc;
  transition: all 0.2s ease;
  pointer-events: auto;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.diff-btn:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

.diff-btn:active {
  transform: scale(0.93);
}

.diff-btn.active {
  background: linear-gradient(135deg, #00f0ff, #0077ff);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0, 240, 255, 0.4);
}

.chess-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  width: 100%;
}